Researcher Profile and Settings

Master

Affiliation (Master)

• Faculty of Engineering　Sustainable Resources Engineering　Resources Engineering

Affiliation (Master)

• Faculty of Engineering　Sustainable Resources Engineering　Resources Engineering

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Profile and Settings

Profile and Settings

• Name (Japanese)

  Ito

• Name (Kana)

  Mayumi

• Name

  200901089911481692

Alternate Names

https://www.eng.hokudai.ac.jp/labo/mprr/indexjp.htm#topic.jpg

Achievement

Research Interests

• 選鉱   資源開発工学   地球・資源システム工学   リサイクル工学   リサイクル   土壌汚染   土壌洗浄法   資源化   廃棄物   海洋資源   物理選別   比重選別   flotation   Magnetic separation   ジグ   ジグ選別   コバルトリッチクラスト   鉛土壌汚染   錯化溶解   酸化還元   カテコール   プラスチック   黄鉄鉱   複合廃棄物   湿式製錬   銅   剥離   灰分分離   ヒドロキシヒドロキノン   薄膜   カラムリーチング   鉱山酸性汚濁水   サイクリックボルタンメトリ   TiO_2   

Research Areas

• Energy / Earth resource engineering, energy science
• Environmental science/Agricultural science / Environmental materials/recycling technology

Research Experience

• 2022/08 - Today Hokkaido University Faculty of Engineering Professor
• 2010/12 - Today 北海道大学 工学研究院 准教授
• 2004/05 - 2010/11 Hokkaido University Faculty of Engineering Assistant Professor
• 2001/04 - 2004/03 Waseda University School of Science and Engineering
• 2000/04 - 2001/03 Waseda University School of Science and Engineering
• 1996/04 - 1999/03 日本学術振興会 特別研究員（DC1）

Education

• 1996/04 - 2000/03  Hokkaido University  Graduate School of Engineering
• 1994/04 - 1996/03  Hokkaido University  Graduate School of Engineering
• 1990/04 - 1994/03  Hokkaido University  School of Engineering  Department of Mineral Resources Engineering

Awards

• 2021/06 廃棄物資源循環学会 令和元年論文賞
   The effects of particle geometry on separation efficiency 

  受賞者: heerayut Phengsaart;Mayumi Ito;Arisa Azuma;Carlito Baltazar Tabelin;Naoki Hiroyoshi
• 2020/03 国際科学技術財団 平成記念研究助成
   アフリカにおける有害金属の汚染対策と環境修復技術 -動物と人が健康に暮らせる世界の創成を目指して 

  受賞者: 中山 翔太;中田 北斗内田;伊藤 真由美;樋渡 雅人
• 2020/03 資源・素材学会 Paper award
   alvanic Microencapsulation (GME) Using Zero-Valent Aluminum and Zero-Valent Iron to Suppress Pyrite Oxidation 

  受賞者: S. Seng, C.B. Tabelin, M. Kojima, N. Hiroyoshi, M. Ito
• 2005/03 資源・素材学会 資源・素材学会第6回若手ポスター賞
   単体分離促進のための電気パルスによる選択粉砕機構の解明～石炭含有鉱物の粉砕性は何で決まるのか～ 

  受賞者: 伊藤 真由美
• 2005/03 資源・素材学会 資源・素材学会第30回奨励賞
   Advanced Coal Cleaningに関する一連の研究’ 

  受賞者: 伊藤 真由美
• 2003/06 環境資源工学会 環境資源工学会第110回例会，ポスター賞
   

  受賞者: 伊藤 真由美

Published Papers

• APiS (AI powered intelligence spectrum analyser): hyperspectral imaging machine learning analyser app for mineral processing

  Natsuo Okada, Narihiro Owada, Kaito Takizawa, Brian Bino Sinaice, Okhala Muacanhia, Angesom Gebretsadik, Shunki Tanaka, Kosei Aikawa, Ilhwan Park, Mayumi Ito, Yoko Ohtomo, Youhei Kawamura

  International Journal of Mining, Reclamation and Environment 1 - 27 1748-0930 2024/10/02
• Microencapsulation-based surface modification for improving flotation separation of Cu-Zn mixed sulfide minerals

  Ilhwan Park, Dai Uchida, Sanghee Jeon, Kosei Aikawa, Naoki Hiroyoshi, Mayumi Ito

  Minerals Engineering 213 108756 - 108756 0892-6875 2024/08
• Role of Semiconductive Property on Selective Cementation Mechanism of Iron Oxides to Gold in Galvanic Interaction with Zero-Valent Aluminum from Gold–Copper Ammoniacal Thiosulfate Solutions

  Joshua Zoleta, Kosei Aikawa, Nako Okada, Ilhwan Park, Mayumi Ito, Yogarajah Elakneswaran, Naoki Hiroyoshi

  Metals 14 (5) 550 - 550 2024/05/07 

  Iron oxides (hematite, Fe2O3, and magnetite, Fe3O4), previously used as electron mediators in the galvanic system with zero-valent aluminum (ZVAl), have been shown to recover Au upon cementation in Au–Cu ammoniacal thiosulfate media selectively, and this warrants further investigation. This research is focused on investigating the role of the semiconductive properties of metal oxides by performing a cementation experiment by mixing 0.15 g of electron mediators (Fe3O4, Fe2O3, TiO2 (anatase and rutile)) and 0.15 g of zero-valent aluminum powder as an electron donor in various electrochemical experiments. The results revealed that upon the cementation experiment, synthetic Fe2O3 and Fe3O4 were consistently able to selectively recover Au at around 90% and Cu at around 20%. Compared to activated carbon (AC), TiO2, in anatase and rutile forms, obtained selective recovery of gold, but the recovery was utterly insignificant compared to that of iron oxides, obtaining an average of 93% Au and 63% Cu recovery. The electrochemical and surface analysis supports the results obtained upon the cementation process, where TiO2, upon cyclic voltammetry (CV), obtained two reduction peaks centered at −1.0 V and −0.5 V assigned to reducing Au and Cu ions, respectively. Furthermore, various electrochemical impedance spectroscopic analyses revealed that the flat band potential obtained in the Mott–Schottky plot is around −1.0 V and −0.2 V for iron oxides and titanium oxides, respectively, suggesting that the electrons travel from semiconductor interface to electrolyte interface, and electrons are accessible only to Au ions in the electrolyte interface (reduction band edge around −1.0 V). The determination of this selective cementation mechanism is one of a kind. It has been proposed that the semiconductive properties of Fe2O3, Fe3O4, and, by configuring their relative energy band diagram, the travel of electrons from the iron oxide–electrolyte interface facilitate the selective cementation towards Au(S2O3)23+ ions in gold–copper ammoniacal thiosulfate solutions.
• Isolation and Characterization of Indigenous Ureolytic Bacteria from Mindanao, Philippines: Prospects for Microbially Induced Carbonate Precipitation (MICP)

  Kryzzyl M. Maulas, Charla S. Paredes, Carlito Baltazar Tabelin, Mark Anthony Jose, Einstine M. Opiso, Takahiko Arima, Ilhwan Park, Walubita Mufalo, Mayumi Ito, Toshifumi Igarashi, Theerayut Phengsaart, Edrhea Villas, Sheila L. Dagondon, Ephrime B. Metillo, Mylene M. Uy, Al James A. Manua, Mylah Villacorte-Tabelin

  Minerals 14 (4) 339 - 339 2024/03/26 

  Microbially induced carbonate precipitation (MICP), a widespread phenomenon in nature, is gaining attention as a low-carbon alternative to ordinary Portland cement (OPC) in geotechnical engineering and the construction industry for sustainable development. In the Philippines, however, very few works have been conducted to isolate and identify indigenous, urease-producing (ureolytic) bacteria suitable for MICP. In this study, we isolated seven, ureolytic and potentially useful bacteria for MICP from marine sediments in Iligan City. DNA barcoding using 16s rDNA identified six of them as Pseudomonas stutzeri, Pseudomonas pseudoalcaligenes, Bacillus paralicheniformis, Bacillus altitudinis, Bacillus aryabhattai, and Stutzerimonas stutzeri but the seventh was not identified since it was a bacterial consortium. Bio-cementation assay experiments showed negligible precipitation in the control (without bacteria) at pH 7, 8, and 9. However, precipitates were formed in all seven bacterial isolates, especially between pH 7 and 8 (0.7–4 g). Among the six identified bacterial species, more extensive precipitation (2.3–4 g) and higher final pH were observed in S. stutzeri, and B. aryabhattai, which indicate better urease production and decomposition, higher CO2 generation, and more favorable CaCO3 formation. Characterization of the precipitates by scanning electron microscopy with energy dispersive X-ray spectroscopy (SEM-EDS) and attenuated total reflectance Fourier transform spectroscopy (ATR-FTIR) confirmed the formation of three carbonate minerals: calcite, aragonite, and vaterite. Based on these results, all six identified indigenous, ureolytic bacterial species from Iligan City are suitable for MICP provided that the pH is controlled between 7 and 8. To the best of our knowledge, this is the first report of the urease-producing ability and potential for MICP of P. stutzeri, P. pseudoalcaligenes, S. stutzeri, and B. aryabhattai.
• Effect of chicken manure amendment on lead burden in mice: exposure to lead-spiked soil

  Nyein Chan Soe, Yared Beyene Yohannes, Takamitsu Ohigashi, Hokuto Nakata, Chikae Tatsumi, Yoshitaka Uchida, Walubita Mufalo, Mayumi Ito, Tsutomu Sato, Toshifumi Igarashi, Yoshinori Ikenaka, Mayumi Ishizuka, Shouta M. M. Nakayama

  Journal of Soils and Sediments 1439-0108 2024/03/13
• Insights on hazardous metal bioaccessibility, and groundwater impacted by Zn residues from a legacy mine and risk evaluation of adjacent soils

  Walubita Mufalo, Takahiko Arima, Toshifumi Igarashi, Mayumi Ito, Tsutomu Sato, Shingo Tomiyama, Imasiku Nyambe, Carlito Baltazar Tabelin, Hokuto Nakata, Shouta Nakayama, Mayumi Ishizuka

  Environmental Geochemistry and Health 46 (2) 0269-4042 2024/02/06
• A Mixed Media Approach Using Locally Available Neutralizing Materials for the Passive Treatment of Acid Mine Drainage

  Joshua Pascual Pocaan, Casey Oliver A. Turingan, Carlito Baltazar Tabelin, Joshua B. Zoleta, Takahiko Arima, Ilhwan Park, Mayumi Ito, Aileen H. Orbecido

  2024/01/05 

  Abstract Acid mine drainage (AMD)—the strongly acidic and highly polluted effluents from mine sites—are generally managed via active or passive treatment. Active treatment strategies are effective but requires continuous input of energy, chemicals and manpower making them unsustainable in the long term. Because of this, passive treatment is explored as a more sustainable alternative especially for abandoned and legacy mines. Recent studies of the authors have explored the use limestone and waste materials like low-grade ores (LGO), fly ash (FA), and concrete wastes for AMD treatment and found that although these materials generated alkalinity individually, they could only partially remove sulfate (SO₄²⁻) and some heavy metals. To address this limitation, a mixed media approach using these four materials is proposed to neutralize the pH of AMD and maximize heavy metals (Cu, Fe, Mn, Ni, and Al) and SO₄²⁻ removal. A total of twenty (20) mixtures of the four materials were identified based on the response surface methodology (RSM) experimental design. Laboratory-scale experiments using simulated AMD were performed to assess the performance of each mixture by monitoring the pH, oxidation-reduction potential (Eh), electrical conductivity (EC), metal concentrations, and SO₄²⁻ concentration. Based on the results, three optimized mixed media compositions were identified in wt%: (i) 43% LGO, 40% limestone, 17% CW; (ii) 44% LGO, 51% limestone, 6% CW; and (iii) 89% limestone, 11% LGO. Overall, simulated AMD passively treated by the optimized mixed media compositions met the Philippine effluent standards except for SO₄²⁻. Simulated AMD treated by the optimized mixed media achieved pH values of < 9 and removal efficiencies for Cu, Fe, Mn, Ni, and Al of about 99%, 99%, 98%, 70%, and 96%, respectively.
• 半焼成ドロマイトおよびリン酸塩を用いたカブウェ鉱山鉱さい中の重金属不溶化特性

  Takahiko ARIMA, Kenta NOTO, Walubita MUFALO, Toshifumi IGARASHI, Mayumi ITO, Tsutomu SATO, Hokuto NAKATA, Shouta NAKAYAMA, Mayumi ISHIZUKA

  Resources Processing 70 (3) 141 - 150 1348-6012 2024
• Modified Diglycolamide Resin: Characterization and Potential Application for Rare Earth Element Recovery

  Junnile L. Romero, Carlito Baltazar Tabelin, Ilhwan Park, Richard D. Alorro, Joshua B. Zoleta, Leaniel C. Silva, Takahiko Arima, Toshifumi Igarashi, Takunda Mhandu, Mayumi Ito, Steffen Happel, Naoki Hiroyoshi, Vannie Joy T. Resabal

  Minerals 13 (10) 1330 - 1330 2023/10/14 

  Rare earth elements (REEs) are crucial for green energy applications due to their unique properties, but their extraction poses sustainability challenges because the global supply of REEs is concentrated in a few countries, particularly China, which produces 70% of the world’s REEs. To address this, the study investigated TK221, a modified extraction chromatographic resin featuring diglycolamide (DGA) and carbamoyl methyl phosphine oxide (CMPO), as a promising adsorbent for REE recovery. The elemental composition and functional groups of DGA and CMPO on the polystyrene-divinylbenzene (PS-DVB) support of TK221 were confirmed using scanning electron microscopy with energy dispersive X-ray spectroscopy (SEM-EDX), attenuated total reflectance Fourier transform infrared spectroscopy (ATR-FTIR), and X-ray photoelectron spectroscopy (XPS). The adsorption kinetics of neodymium (Nd), yttrium (Y), cerium (Ce), and erbium (Er) followed the pseudo-second-order kinetic model and Langmuir isotherm, indicating monolayer chemisorption. Furthermore, iron (Fe) adsorption reached apparent equilibrium after 360 min, with consistent Fe adsorption observed at both 360 min and 1440 min. The inclusion of Fe in the study is due to its common presence as an impurity in most REE leachate solutions. The Fe adsorption isotherm results are better fitted with the Langmuir isotherm, implying chemisorption. Maximum adsorption capacities (qmax) of the resin were determined as follows: Nd (45.3 mg/g), Ce (43.1 mg/g), Er (35.1 mg/g), Y (15.6 mg/g), and Fe (12.3 mg/g). ATR-FTIR analysis after adsorption suggested that both C=O and P=O bands shifted from 1679 cm−1 to 1618 cm−1 and 1107 cm−1 to 1142 cm−1 for Y, and from 1679 cm−1 to 1607 cm−1 and 1107 cm−1 to 1135 cm−1 for Ce, implying possible coordination with REEs. These results suggest that TK221 has a huge potential as an alternative adsorbent for REE recovery, thus contributing to sustainable REE supply diversification.
• A novel recycling route for aluminum alloys: Synthesis of Fe/Al bimetallic materials and magnetic separation

  Ilhwan Park, Mayumi Ito, Sanghee Jeon, Carlito Baltazar Tabelin, Theerayut Phengsaart, Marthias Silwamba, Naoki Hiroyoshi

  Minerals Engineering 201 108202 - 108202 0892-6875 2023/10
• Recent Studies and Technologies in the Separation of Polyvinyl Chloride for Resources Recycling: A Systematic Review

  Theerayut Phengsaart, Pongsiri Julapong, Chaiwat Manositchaikul, Palot Srichonphaisarn, Monthicha Rawangphai, Onchanok Juntarasakul, Kosei Aikawa, Sanghee Jeon, Ilhwan Park, Carlito Baltazar Tabelin, Mayumi Ito

  Sustainability 15 (18) 13842 - 13842 2023/09/18 

  Material recycling and thermal treatment are the two most common recycling methods employed for plastic waste management. Thermal treatment for energy recovery is more widely applied compared with material recycling because the latter requires a high efficiency of separation and a high purity of products. Unfortunately, certain plastics like polyvinyl chloride (PVC) are unsuitable for thermal treatment because they contain additives like chloride (Cl−) that have adverse effects on refractory materials used in boilers. As a result of this, mixed plastic wastes containing PVC generally end up in landfills. PVC-bearing mixed plastics, however, remain valuable resources as championed by the United Nation Sustainable Development Goals (UN-SDGs): Goal 12 “Responsible production and consumption”, and their recycling after the removal of PVC is important. In this paper, recent studies (2012–2021) related to the separation of PVC from other types of plastics were systematically reviewed using the Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) guidelines. A total of 66 articles were selected, reviewed, and summarized. The results showed that various separation technologies conventionally applied to mineral processing—selective comminution, gravity separation, magnetic separation, electrical separation, and flotation—have been studied for PVC separation, and the majority of these works (>60%) focused on flotation. In addition, more advanced technologies including sorting and density-surface-based separation were introduced between 2019 and 2021.
• A Pretreatment of Refractory Gold Ores Containing Sulfide Minerals to Improve Gold Leaching by Ammonium Thiosulfate: A Model Experiment Using Gold Powder and Arsenic-Bearing Sulfide Minerals

  Takunda Joseph Mhandu, Ilhwan Park, Sanghee Jeon, Sohta Hamatsu, Yogarajah Elakneswaran, Mayumi Ito, Naoki Hiroyoshi

  Metals 13 (8) 1357 - 1357 2023/07/28 

  The use of thiosulfate to extract gold from refractory ores is promising because of its non-toxicity and high selectivity. Sulfide minerals (i.e., pyrite, arsenopyrite, chalcopyrite), major gold carriers in refractory gold ores, however, hinder gold extraction due to the high consumption of a lixiviant. In this study, a new method to improve gold extraction from sulfide bearing gold ores is proposed based on the model experiments using a mixture of gold powder and arsenopyrite-bearing sulfide (HAsBS) ore. The effects of HAsBS ore on gold leaching in ammonium thiosulfate solutions were investigated, and it was found that gold extraction in the presence of HAsBS ore was suppressed because of the unwanted decomposition of thiosulfate on the surface of sulfide minerals. To improve gold extraction in the presence of the sulfide minerals, this study investigated the effects of the pretreatment of HAsBS ore using ammonium solutions containing cupric ions and confirmed that HAsBS ore was oxidized in the pretreatment and its surface was covered by the oxidation products. As a result, thiosulfate consumption was minimized in the subsequent gold leaching step using ammonium thiosulfate, resulting in an improvement in gold extraction from 10% to 79%.
• Rare Earth Elements Recovery from Primary and Secondary Resources Using Flotation: A Systematic Review

  Pongsiri Julapong, Apisit Numprasanthai, Ladda Tangwattananukul, Onchanok Juntarasakul, Palot Srichonphaisarn, Kosei Aikawa, Ilhwan Park, Mayumi Ito, Carlito Baltazar Tabelin, Theerayut Phengsaart

  Applied Sciences 13 (14) 8364 - 8364 2023/07/19 

  Rare earth minerals (REMs) contain rare earth elements (REEs) that are important in modern technologies due to their unique magnetic, phosphorescent, and catalytic properties. However, REMs are not only non-renewable resources but also non-uniformly distributed on the Earth’s crust, so the processing of REE-bearing secondary resources via recycling is one potential route to ensure the long-term sustainability of REE supply. Flotation—a method that separates materials based on differences in their surface wettability—is a process applied for both mineral processing and recycling of REEs, especially when the particles are fine and/or a high-purity product is required. In this review, studies about rare earth flotation from 2012 to 2021 were systematically reviewed using the PRISMA guideline. It was found that most REM flotation research works focused on finding better collectors and depressants while, for recycling, studies on advanced flotation techniques like froth flotation, ion flotation, solvent sublation, electroflotation, and adsorbing colloid flotation with an emphasis on the recovery of dissolved REEs from aqueous solutions dominated.
• Selective Cementation of Gold Using an Iron Oxide and Zero-Valent Aluminum Galvanic System from Gold–Copper Ammoniacal Thiosulfate Solutions

  Joshua Zoleta, Sanghee Jeon, Akuru Kuze, Nako Okada, Ilhwan Park, Mayumi Ito, Yogarajah Elakneswaran, Naoki Hiroyoshi

  Metals 13 (7) 1289 - 1289 2023/07/18 

  Ammonium thiosulfate leaching is a promising alternative to the conventional cyanide method for extracting gold from ores. However, strategies for recovering gold from the leachate are less commercially used due to its low affinity to gold. The present study investigated the recovery of gold from the leachate using iron oxides (hematite, Fe2O3 or magnetite, Fe3O4). Cementation experiments were conducted by mixing 0.15 g of aluminum powder as an electron donor and 0.15 g of an electron mediator (activated carbon, hematite, or magnetite) in 10 mL of ammonium thiosulfate leachate containing 100 mg/L gold ions and 10 mM cupric ions for 24 h at 25 °C. The results of the solution analysis showed that when activated carbon (AC) was used, the gold was recovered together with copper (recoveries were 99.99% for gold and copper). However, selective gold recovery was observed when iron oxides were used, where the gold and copper recoveries were 89.7% and 21% for hematite and 85.9% and 15.4% for magnetite, respectively. An electrochemical experiment was also conducted to determine the galvanic interaction between the electron donor and electron mediator in a conventional electrochemical setup (hematite/magnetite–Al as the working electrode, Pt as the counter electrode, Ag/AgCl as the reference electrode) in a gold–thiosulfate medium. Cyclic voltammetry showed a gold reduction “shoulder-like” peak at −1.0 V using hematite/Al and magnetite/Al electrodes. Chronoamperometry was conducted and operated at a constant voltage (−1.0 V) determined during cyclic voltammetry and further analyzed using SEM-EDX. The results of the SEM-EDX analysis for the cementation products and electrochemical experiments confirmed that the gold was selectively deposited on the iron oxide surface as an electron mediator.
• Carrier Flotation Using Coarse Pyrite for Improving the Recovery of Finely Ground Chalcopyrite: Development of Post-Process of Carrier Flotation to Separate Finely Ground Chalcopyrite Particles from Coarse Pyrite Particles

  Muhammad Bilal, Ilhwan Park, Mayumi Ito, Fawad Ul Hassan, Kosei Aikawa, Sanghee Jeon, Naoki Hiroyoshi

  Minerals 13 (7) 916 - 916 2023/07/07 

  Carrier flotation is a technique that can recover fine particles by using coarse carrier particles during the flotation process. In heterogeneous carrier flotation, coarse mineral particles of different minerals are used as carriers to recover fine mineral particles. By using Cu2+-treated pyrite particles as carriers, fine chalcopyrite particles recovery could be improved. However, a disadvantage of this heterogeneous carrier flotation is that it requires a post-flotation separation process to improve the grade of the final Cu concentrate. This study tested mechanical and chemical treatments to detach finely ground chalcopyrite (D50~3.5 µm) particles from Cu2+-treated coarse pyrite particles (−125 + 106 µm) after flotation. The results showed that the ultrasonic treatment was not effective to detach chalcopyrite fines from Cu2+-treated pyrite particles. However, acid treatment was effective to detach chalcopyrite fines from coarse pyrite particles. At pH 2, approximately 96% of chalcopyrite fines were detached from coarse Cu2+-treated pyrite particles. The acid treatment of flotation froth (mixture of chalcopyrite fines and Cu2+-treated pyrite particles) decomposed the collector KAX (potassium amyl xanthate) and dissolved the Cu precipitates adsorbed on the pyrite surface. This weakened the hydrophobic attraction force between the chalcopyrite fines and coarse pyrite particles, thus promoting the detachment of chalcopyrite fines from Cu2+-treated coarse pyrite particles.
• Immobilization of Pb and Zn leached from mining residue materials in Kabwe, Zambia: Performance of calcined dolomite in column experiments

  Walubita Mufalo, Pawit Tangviroon, Takahiko Arima, Toshifumi Igarashi, Mayumi Ito, Tsutomu Sato, Kenta Noto, Takeshi Kawashima, Imasiku Nyambe, Hokuto Nakata, Shouta Nakayama, Mayumi Ishizuka

  Journal of Geochemical Exploration 249 107209 - 107209 0375-6742 2023/06
• Social cost of mining-related lead (Pb) pollution in Kabwe, Zambia, and potential remediation measures

  Daichi Yamada, Masato Hiwatari, Daiju Narita, Peter Hangoma, Bona Chitah, Hokuto Nakata, Shouta M.M. Nakayama, John Yabe, Mayumi Ito, Toshifumi Igarashi, Mayumi Ishizuka, Golden Zyambo

  Science of The Total Environment 865 161281 - 161281 0048-9697 2023/03
• Flotation of Copper Ores with High Cu/Zn Ratio: Effects of Pyrite on Cu/Zn Separation and an Efficient Method to Enhance Sphalerite Depression

  Kosei Aikawa, Mayumi Ito, Nodoka Orii, Sanghee Jeon, Ilhwan Park, Kazutoshi Haga, Taro Kamiya, Tatsuru Takahashi, Kazuya Sunada, Taisuke Sakakibara, Tatsuhiro Ono, Refilwe S. Magwaneng, Naoki Hiroyoshi

  Minerals 12 (9) 1103 - 1103 2022/08/30 

  Porphyry copper deposits are important sources of copper and typically processed by flotation to produce copper concentrates. As mining areas become deeper, the amounts of impurities, such as sphalerite, can be increased in copper ores, so the appropriate depression of sphalerite floatability should be achieved to obtain saleable copper concentrates. In this study, the flotation behaviors of chalcopyrite and sphalerite in model samples mimicking copper ores with high Cu/Zn ratios (i.e., the ratio of chalcopyrite/sphalerite = 13:1) were investigated with zinc sulfate as a depressant for sphalerite. In addition, the effect of pyrite—a major gangue mineral in copper ores—on the depression of sphalerite floatability with zinc sulfate was examined. When sphalerite and chalcopyrite coexisted, the floatability of the former was effectively depressed by zinc sulfate (Zn recovery: <12%), whereas the presence of pyrite promoted the release of Cu2+ due to the galvanic interaction with chalcopyrite, which resulted in the elimination of the effectiveness of zinc sulfate in depressing sphalerite floatability (Zn recovery: >90%). Despite the presence of much higher amounts of chalcopyrite and pyrite than sphalerite, the application of nitrogen (N2) gas limiting the galvanic interaction between pyrite and chalcopyrite by reducing the dissolved oxygen (DO) concentration in the system effectively depressed the floatability of sphalerite (Zn recovery: <30%).
• Development of a Sustainable Process for Complex Sulfide Ores Containing Anglesite: Effect of Anglesite on Sphalerite Floatability, Enhanced Depression of Sphalerite by Extracting Anglesite, and Recovery of Extracted Pb2+ as Zero-Valent Pb by Cementation Using Zero-Valent Fe

  Kosei Aikawa, Mayumi Ito, Atsuhiro Kusano, Sanghee Jeon, Ilhwan Park, Naoki Hiroyoshi

  Minerals 12 (6) 723 - 723 2022/06/06 

  The presence of anglesite (PbSO4) in complex sulfide ores negatively affects the separation of Cu-Pb sulfides and sphalerite (ZnS) due to lead activation, and PbSO4 rejected to tailings dams contaminates the surrounding environment with lead. To address these problems, this study investigated the application of ethylene diamine tetra acetic acid (EDTA) pretreatment extracting PbSO4 to ZnS flotation and the recovery of the extracted Pb2+ as zero-valent Pb by cementation using zero-valent iron (ZVI). The application of EDTA pretreatment could extract ~99.8% of PbSO4, thus depressing ZnS floatability from 82% to 30%. In addition, cementation using ZVI could recover ~99.7% of Pb2+ from the leachate of EDTA pretreatment.
• Impacts of Surface Water on Windborne Lead Dispersion from the Zinc Plant Leach Residue in Kabwe, Zambia

  Shinsaku Nakamura, Toshifumi Igarashi, Yoshitaka Uchida, Mayumi Ito, Kazuyo Hirose, Tsutomu Sato, Walubita Mufalo, Meki Chirwa, Imasiku Nyambe, Hokuto Nakata, Shouta Nakayama, Mayumi Ishizuka

  Minerals 12 (5) 2022/05 

  Effects of the water content of ground surface on windborne lead (Pb) dispersion from the zinc (Zn) leach residue site at the Kabwe mine, Zambia, were simulated. The Pb-bearing Zn plant leach residue site was selected as the source of the dispersion, and water conditions of the surface of the source were evaluated by the modified normalized difference water index (MNDWI) under the actual weather conditions in the year 2019. The MNDWI was calculated based on Sentinel-2 datasets, which were acquired in the year 2019. The index was used for monitoring the surface condition of the source necessary for simulating Pb dispersion, because the higher surface water content reduces the intensity of windborne source. The results showed that the wind speeds and directions had huge impacts on Pb dispersion when the MNDWI had negative values, and that the dispersion was inhibited when the MNDWI had positive values. These indicate that the water content of the surface is sensitive to dispersion, and that MNDWI is an effective parameter that expresses the source strength.
• Alkaline Leaching and Concurrent Cementation of Dissolved Pb and Zn from Zinc Plant Leach Residues

  Marthias Silwamba, Mayumi Ito, Naoki Hiroyoshi, Carlito Baltazar Tabelin, Ryota Hashizume, Tomoki Fukushima, Ilhwan Park, Sanghee Jeon, Toshifumi Igarashi, Tsutomu Sato, Imasiku Nyambe, Hokuto Nakata, Shouta Nakayama, Mayumi Ishizuka

  Minerals 12 (4) 2022/04 

  Zinc plant leach residues (ZPLRs), particularly those produced using old technologies, have both economic importance as secondary raw materials and have environmental impacts because they contain hazardous heavy metals that pose risks to human health and the environment. Therefore, the extraction and recovery of these metals from ZPLRs has both economic and environmental benefits. In this study, we investigated the removal of lead (Pb) and zinc (Zn) from ZPLRs by alkaline (NaOH) leaching and the concurrent cementation of dissolved Pb and Zn using aluminum (Al) metal powder. The effects of the leaching time, NaOH concentration, solid-to-liquid ratio (S/L), and dosage of Al metal powder on the extraction of Pb and Zn were investigated. Pb and Zn removal efficiencies increased with increasing NaOH concentrations and decreasing S/Ls. The Pb and Zn removal efficiencies were 62.2% and 27.1%, respectively, when 2.5 g/50 mL (S/L) of ZPLRs were leached in a 3 M NaOH solution for 30 min. The extraction of Pb and Zn could be attributed to the partitioning of these metals in relatively more mobile phases—water-soluble, exchangeable, and carbonate phases— in ZPLRs. Around 100% of dissolved Pb and less than 2% of dissolved Zn were cemented in leaching pulp when Al metal powder was added. Minerals in the solid residues, particularly iron oxides minerals, were found to suppress the cementation of extracted Zn in leaching pulp, and when they were removed by filtration, Zn was recovered by Al metal powder via cementation.
• Heterogenous carrier flotation technique for recovering finely ground chalcopyrite particles using coarse pyrite particles as a carrier

  Muhammad Bilal, Mayumi Ito, Riku Akishino, Xiangning Bu, Fawad Ul Hassan, Ilhwan Park, Sanghee Jeon, Kosei Aikawa, Naoki Hiroyoshi

  Minerals Engineering 180 0892-6875 2022/04 

  The recovery of fine mineral particles in flotation is limited owing to the low collision probability between the particles and air bubbles. The carrier flotation method can enhance fine particle recovery by attaching fines to coarse carrier particles. In this study, an attempt was made to improve the recovery of chalcopyrite fines using coarse pyrite particles as a carrier. Flotation experiments for finely ground chalcopyrite (D50 ∼ 3 µm) were conducted with and without coarse pyrite (–125+106 µm) using potassium amyl xanthate as a collector. The results showed that untreated pyrite did not act as an effective carrier and that the amount of fine chalcopyrite attached to pyrite was not significant; furthermore, Cu recovery into froth was around 65% both with and without pyrite. When pyrite was pre-treated with a CuSO4 solution, its carrier ability improved owing to a significant amount of fine chalcopyrite becoming attached to the Cu2+-activated pyrite particles and being recovered with pyrite into the froth (Cu recovery, >90%). Overall, the treatment of pyrite with CuSO4 improved its hydrophobicity, which improved its hydrophobic interactions with fine chalcopyrite particles. Thus, the Cu2+-treatment of pyrite promotes the attachment of fine chalcopyrite particles for their increased recovery from fines.
• A simple and efficient recovery technique for gold ions from ammonium thiosulfate medium by galvanic interactions of zero-valent aluminum and activated carbon: A parametric and mechanistic study of cementation

  S. Jeon, S. Bright, I. Park, C.B. Tabelin, M. Ito, N. Hiroyoshi

  Hydrometallurgy 208 2022/02 [Refereed]
  
• A Kinetic Study on Enhanced Cementation of Gold Ions by Galvanic Interactions between Aluminum (Al) as an Electron Donor and Activated Carbon (AC) as an Electron Mediator in Ammonium Thiosulfate System

  S. Jeon, S. Bright, I. Park, A. Kuze, M. Ito, N. Hiroyoshi

  Minerals 12 (1) 2022/01 [Refereed]
  
• Development of the reverse hybrid jig: Separation of polyethylene and cross-linked polyethylene from eco-cable wire

  Mayumi Ito, Ayumu Saito, Megumi Takeuchi, Nana Murase, Theerayut Phengsaart, Carlito Baltazar Tabelin, Naoki Hiroyoshi

  Minerals Engineering 174 0892-6875 2021/12/01 

  We have developed various types of jigs for resources recycling focusing primarily on plastic-plastic separation. The RETAC jig could be used to separate plastics heavier than water (specific gravity (SG) > 1.0) with different SGs while the hybrid jig—a process combining jig and flotation—was developed to separate plastics with similar SGs but different surface wettabilities. Meanwhile the reverse jig—a RETAC jig with a top screen—is used to separate plastics lighter than water with different SGs. In this study, a novel method that combines the principle of reverse and hybrid jigs, called “reverse hybrid jig separation” was developed to separate plastics lighter than water having similar SGs but different surface wettabilities. The tests were carried out with wastes from an eco-cable wire recycling facility in Japan, which is composed of polyethylene (PE) and cross-linked polyethylene (XLPE). The reverse hybrid jig separation results showed that bubble attachment to and detachment from plastic particles strongly influenced the separation efficiency. In addition, the effects of particle size on separation efficiency were also evaluated.
• Beneficiation of Low-Grade Rare Earth Ore from Khalzan Buregtei Deposit (Mongolia) by Magnetic Separation

  I. Park, Y. Kanazawa, N. Sato, P. Galtchandmani, M. K. Jha, C.B. Tabelin, S. Jeon, M. Ito, N. Hiroyoshi

  Minerals 11 (12) 2021/12 [Refereed]
  
• Addition of Fe3O4 as electron mediator for enhanced cementation of Cd2+ and Zn2+ on aluminum powder from sulfate solutions and magnetic separation to concentrate cemented metals from cementation products

  S. Choi, S Jeon, I. Park, M. Ito, N. Hiroyoshi

  Journal of Environmental Chemical Engineering 9 (6) 2021/12 [Refereed]
  
• Solid-Phase Partitioning and Leaching Behavior of Pb and Zn from Playground Soils in Kabwe, Zambia.

  Walubita Mufalo, Pawit Tangviroon, Toshifumi Igarashi, Mayumi Ito, Tsutomu Sato, Meki Chirwa, Imasiku Nyambe, Hokuto Nakata, Shouta Nakayama, Mayumi Ishizuka

  Toxics 9 (10) 2021/10/04 

  Zambia's Kabwe mine wastes (KMWs) are responsible for contaminating the surrounding soil and dust in the Kabwe district. Unfortunately, these wastes arise from the historical mining activities of lead (Pb) and Zinc (Zn), which lacked adequate waste management strategies. As a result, potentially toxic elements (PTEs) (Pb and Zn) spread across the Kabwe district. To assess the soil pollution derived from previous mining activities, we studied topsoil samples (n = 8) from the school playground soils (SPs). In this study, the degree of contamination, geochemical partitioning, and leachability, coupled with the release and retention of Pb and Zn, were studied. The SPs were classified as extremely enriched (EF > 40) and contaminated with Pb (Igeo > 5). On average, Pb (up to 89%) and Zn (up to 69%) were bound with exchangeable, weak acid-soluble, reducible and oxidizable phases, which are considered as 'geochemically mobile' phases in the environment. The leachates from the soils (n = 5) exceeded the Zambian standard (ZS: 190:2010) for Pb in potable drinking water (Pb < 0.01 mg/L). Furthermore, the spatial distribution of Pb and Zn showed a significant reduction in contents of Pb and Zn with the distance from the mine area.
• Simultaneous extraction and recovery of lead using citrate and micro-scale zero-valent iron for decontamination of polluted shooting range soils

  Marthias Silwamba, Mayumi Ito, Carlito Baltazar Tabelin, Ilhwan Park, Sanghee Jeon, MasaoTakada, Yasushi Kubo, Naohiro Hokari, Masami Tsunekawa, Naoki Hiroyoshi

  Environmental Advances 5 2021/10 [Refereed]
  
• Repurposing of aluminum scrap into magnetic Al0/ZVI bimetallic materials: Two-stage mechanical-chemical synthesis and characterization of products

  C.B. Tabelin, V.J.T. Resabal, I. Park, M.G.B. Vilanueva, S. Choi, R. Ebio, P.J. Cabural, M.V. Tabelin, A. Orbecido, R.D. Alorro, S. Jeon, M. Ito, N. Hiroyoshi

  Journal of Cleaner Production 317 2021/10 [Refereed]
  
• A novel arsenic immobilization strategy via a two-step process: Arsenic concentration from dilute solution using schwertmannite and immobilization in Ca–Fe–AsO4 compounds

  I. Park, T. Ryota, T Yuto, C.B. Tabelin, T. Phengsaart, S. Jeon, M. Ito, N. Hiroyoshi

  Journal of Environmental Management 295 2021/10 [Refereed]
  
• Agglomeration-flotation of finely ground chalcopyrite using surfactant-stabilized oil emulsions: Effects of co-existing minerals and ions

  V. Horn, I. Park, M. Ito, H Shimada, T. Suto, C.B. Tabelin, S. Jeon, N. Hiroyoshi

  Minerals Engineering 171 2021/09 [Refereed]
  
• The Effects of Coexisting Copper, Iron, Cobalt, Nickel, and Zinc Ions on Gold Recovery by Enhanced Cementation via Galvanic Interactions between Zero-Valent Aluminum and Activated Carbon in Ammonium Thiosulfate Systems

  S. Jeon, S. Bright, I. Park, C.B. Tabelin, M. Ito, N. Hiroyoshi

  Metals 11 (9) 2021/08 [Refereed]
  
• Enhanced pyrite passivation by carrier-microencapsulation using Fe-catechol and Ti-catechol complexes

  X. Li, I. Park, C.B. Tabelin, K. Naruwa, T. Goda, C Harada, S. Jeon, M. Ito, N. Hiroyoshi

  Journal of Hazardous Materials 416 2021/08 [Refereed]
  
• Evaluation of Dispersion of Lead-Bearing Mine Wastes in Kabwe District, Zambia

  Shinsaku Nakamura, Toshifumi Igarashi, Yoshitaka Uchida, Mayumi Ito, Kazuyo Hirose, Tsutomu Sato, Walubita Mufalo, Meki Chirwa, Imasiku Nyambe, Hokuto Nakata, Shouta Nakayama, Mayumi Ishizuka

  MINERALS 11 (8) 2021/08 

  Dispersion of lead (Pb) in mine wastes was simulated for reproducing Pb contamination of soil in Kabwe District, Zambia. Local weather data of year 2019 were monitored in situ and used for the simulations. The plume model, weak puff model, and no puff model were adopted for calculation of Pb dispersion under different wind conditions. The results showed that Pb dispersion from the Kabwe mine was directly affected by wind directions and speeds in the dry season, although it was not appreciably affected in the rainy season. This may be because the source strength is lower in the rainy season due to higher water content of the surface. This indicates that Pb dispersion patterns depend on the season. In addition, the distribution of the amount of deposited Pb-bearing soils around the mine corresponded to the distribution of Pb contents in soils. These results suggest that Pb contamination in soils primarily results from dispersion of fine mine wastes.
• Copper and critical metals production from porphyry ores and E-wastes: A review of resource availability, processing/recycling challenges, socio-environmental aspects, and sustainability issues

  C.B. Tabelin, I. Park, T. Phengsaart, S. Jeon, M.V. Tabelin, D. Alonzo, K. Yoo, M. Ito, N. Hiroyoshi

  Resources, Conservation and Recycling 170 2021/07 [Refereed]
  
• Development of a restraining wall and screw-extractor discharge system for continuous jig separation of mixed plastics

  T. Phengsaart, M. Ito, S. Kimura, A. Azuma, K. Hori, H. Tanno, S. Jeon, I. Park, C.B. Tabelin, N. Hiroyoshi

  Minerals Engineering 168 2021/07 [Refereed]
  
• Enhanced cementation of Cd2+, Co2+, Ni2+, and Zn2+ on Al from sulfate solutions by activated carbon addition

  Sanghyeon Choi, Sanghee Jeon, Ilhwan Park, Carlito Baltazar Tabelin, Mayumi Ito, Naoki Hiroyoshi

  Hydrometallurgy 201 0304-386X 2021/05/01 

  Cadmium (Cd), cobalt (Co), nickel (Ni), and zinc (Zn) are important components of batteries and renewable energy technologies but their recovery from pregnant leach solutions or removal from polluted soil systems and water bodies remain challenging. In this study, we report the removal/recovery of heavy metal ions (Cd2+, Co2+ and Ni2+, and Zn2+) from sulfate solutions by a novel cementation technique using aluminum (Al) and activated carbon (AC) called “AC/Al-cementation”. The results showed ~0% removal/recovery efficiencies with Al only for the four heavy metals but with “AC/Al-cementation”, these values increased to 96%, 61%, 57%, and 45% for Zn2+, Ni2+, Co2+, and Cd2+, respectively. Detailed residue characterizations using SEM-EDX, XPS, and AES showed substantial deposition of heavy metal ions in their elemental forms, indicating that the primary mechanism of removal/recovery was cementation. Moreover, the results identified the critical role of AC as an electron pathway from Al (electron donor) to metal ions (electron acceptors) even though Al was covered with Al2O3. Finally, hydrogen overpotential and the subsequent passivation of cemented heavy metals by Al(OH)3 were important limiting factors and processes affecting the efficiency of “AC/Al-cementation” technique.
• Suppression of arsenopyrite oxidation by microencapsulation using ferric-catecholate complexes and phosphate

  I. Park, K. Higuchi, C.B. Tabelin, S. Jeon, M. Ito, N. Hiroyoshi

  Chemosphere 269 2021/04 [Refereed]
  
• Flotation separation of chalcopyrite and molybdenite assisted by microencapsulation using ferrous and phosphate ions: Part II. flotation

  Ilhwan Park, Seunggwan Hong, Sanghee Jeon, Mayumi Ito, Naoki Hiroyoshi

  Metals 11 (3) 1 - 11 2075-4701 2021/03/01 

  Porphyry-type deposits are the major sources of copper and molybdenum, and flotation has been adopted to recover them separately. The conventional reagents used for depressing copper minerals, such as NaHS, Na2S, and Nokes reagent, have the potential to emit toxic H2S gas when pulp pH was not properly controlled. Thus, in this study the applicability of microencapsulation (ME) using ferrous and phosphate ions as an alternative process to depress the floatability of chalcopyrite was investigated. During ME treatment, the use of high concentrations of ferrous and phosphate ions together with air introduction increased the amount of FePO4 coating formed on the chalcopyrite surface, which was proportional to the degree of depression of its floatability. Although ME treatment also reduced the floatability of molybdenite, ~92% Mo could be recovered by utilizing emulsified kerosene. Flotation of chalcopyrite/molybdenite mixture confirmed that the separation efficiency was greatly improved from 10.9% to 66.8% by employing ME treatment as a conditioning process for Cu-Mo flotation separation.
• Effects of coarse chalcopyrite on flotation behavior of fine chalcopyrite

  M. Bilal, M. Ito, K. Koike, V. Hornn, F.U. Hassan, S. Jeon, I. Park, N. Hiroyoshi

  Minerals Engineering 163 2021/03 [Refereed]
  
• Flotation of Seafloor Massive Sulfide Ores: Combination of Surface Cleaning and Deactivation of Lead-Activated Sphalerite to Improve the Separation Efficiency of Chalcopyrite and Sphalerite

  Kosei Aikawa, Mayumi Ito, Atsuhiro Kusano, Ilhwan Park, Tatsuya Oki, Tatsuru Takahashi, Hisatoshi Furuya, Naoki Hiroyoshi

  Metals 11 (2) 253 - 253 2021/02/02 

  The purpose of this study is to propose the flotation procedure of seafloor massive sulfide (SMS) ores to separate chalcopyrite and galena as froth and sphalerite, pyrite, and other gangue minerals as tailings, which is currently facing difficulties due to the presence of water-soluble compounds. The obtained SMS ore sample contains CuFeS2, ZnS, FeS2, SiO2, and BaSO4 in addition to PbS and PbSO4 as Pb minerals. Soluble compounds releasing Pb, Zn2+, Pb2+, and Fe2+/3+ are also contained. When anglesite co-exists, lead activation of sphalerite occurred, and thus sphalerite was recovered together with chalcopyrite as froth. To remove soluble compounds (e.g., anglesite) that have detrimental effects on the separation efficiency of chalcopyrite and sphalerite, surface cleaning pretreatment using ethylene diamine tetra acetic acid (EDTA) was applied before flotation. Although most of anglesite were removed and the recovery of chalcopyrite was improved from 19% to 81% at 20 g/t potassium amyl xanthate (KAX) after EDTA washing, the floatability of sphalerite was not suppressed. When zinc sulfate was used as a depressant for sphalerite after EDTA washing, the separation efficiency of chalcopyrite and sphalerite was improved due to deactivation of lead-activated sphalerite by zinc sulfate. The proposed flotation procedure of SMS ores—a combination of surface cleaning with EDTA to remove anglesite and the depression of lead-activated sphalerite by using zinc sulfate—could achieve the highest separation efficiency of chalcopyrite and sphalerite; that is, at 200 g/t KAX, the recoveries of chalcopyrite and sphalerite were 86% and 17%, respectively.
• Enhanced Cementation of Co2+ and Ni2+ from Sulfate and Chloride Solutions Using Aluminum as an Electron Donor and Conductive Particles as an Electron Pathway

  S. Choi, S Jeon, I. Park, M. Ito, N. Hiroyoshi

  Metals 11 (2) 2021/02 [Refereed]
  
• Flotation Separation of Chalcopyrite and Molybdenite Assisted by Microencapsulation Using Ferrous and Phosphate Ions: Part I. Selective Coating Formation

  Ilhwan Park, Seunggwan Hong, Sanghee Jeon, Mayumi Ito, Naoki Hiroyoshi

  Metals 10 (12) 2020/12 [Refereed]
  
• Solid-phase partitioning and release-retention mechanisms of copper, lead, zinc and arsenic in soils impacted by artisanal and small-scale gold mining (ASGM) activities

  Carlito Baltazar Tabelin, Marthias Silwamba, Florifern C. Paglinawan, Alissa Jane S. Mondejar, Ho Gia Duc, Vannie Joy Resabal, Einstine M. Opiso, Toshifumi Igarashi, Shingo Tomiyama, Mayumi Ito, Naoki Hiroyoshi, Mylah Villacorte-Tabelin

  Chemosphere 260 127574 - 127574 0045-6535 2020/12
• Biosorption of Pb (II) and Zn (II) from aqueous solution by Oceanobacillus profundus isolated from an abandoned mine

  Wilson Mwandira, Kazunori Nakashima, Satoru Kawasaki, Allison Arabelo, Kawawa Banda, Imasiku Nyambe, Meki Chirwa, Mayumi Ito, Tsutomu Sato, Toshifumi Igarashi, Hokuto Nakata, Shouta Nakayama, Mayumi Ishizuka

  Scientific Reports 10 (1) 2020/12 

  The present study investigated biosorption of Pb (II) and Zn (II) using a heavy metal tolerant bacterium Oceanobacillus profundus KBZ 3-2 isolated from a contaminated site. The effects of process parameters such as effect on bacterial growth, pH and initial lead ion concentration were studied. The results showed that the maximum removal percentage for Pb (II) was 97% at an initial concentration of 50 mg/L whereas maximum removal percentage for Zn (II) was at 54% at an initial concentration of 2 mg/L obtained at pH 6 and 30 °C. The isolated bacteria were found to sequester both Pb (II) and Zn (II) in the extracellular polymeric substance (EPS). The EPS facilitates ion exchange and metal chelation-complexation by virtue of the existence of ionizable functional groups such as carboxyl, sulfate, and phosphate present in the protein and polysaccharides. Therefore, the use of indigenous bacteria in the remediation of contaminated water is an eco-friendly way of solving anthropogenic contamination.
• Estimation of hybrid jig separation efficiency using a modified concentration criterion based on apparent densities of plastic particles with attached bubbles

  Mayumi Ito, Ayumu Saito, Nana Murase, Theerayut Phengsaart, Shoko Kimura, Naho Kitajima, Megumi Takeuchi, Carlito Baltazar Tabelin, Naoki Hiroyoshi

  Journal of Material Cycles and Waste Management 22 (6) 2071 - 2080 1611-8227 2020/11/01 

  The hybrid jig, which combines the principles of jig separation and flotation, was recently developed to separate mixed-plastics with similar specific gravities (SG) effectively. In this type of jig, air bubbles are introduced during water pulsation to modify the apparent SG (SGapparent) of plastics by the attachment of air bubbles to the particles so that the hybrid jig can separate materials having identical SGs if their surface wettabilities are different. Because the change in SGapparent—determined by the volume of attached bubbles on the particle surface—is critical for efficient separation in hybrid jigs, a method to estimate this parameter should be developed. In this study, a laser-assisted measurement apparatus was developed to quantify the attached-bubble volume on plastics during water pulsation. Hybrid jig separation was also conducted using three mixtures containing plastics of almost identical SGs: (i) polyvinyl chloride (PVC)/polyethylene terephthalate (PET), (ii) polypropylene with glass fiber (PPGF)/high-impact polystyrene (HIPS), and (iii) cross-linked polyethylene (XLPE)/polyethylene (PE). Finally, to estimate the separation efficiency of hybrid jig, a new index called the apparent concentration criterion (CCapparent) is proposed. The results showed that SGapparent and CCapparent calculated using the proposed methods could be used to estimate the hybrid jig separation efficiency.
• Acid mine drainage formation and arsenic mobility under strongly acidic conditions: Importance of soluble phases, iron oxyhydroxides/oxides and nature of oxidation layer on pyrite

  Carlito Baltazar Tabelin, Ryan D. Corpuz, Toshifumi Igarashi, Mylah Villacorte-Tabelin, Richard Diaz Alorro, Kyoungkeun Yoo, Simit Raval, Mayumi Ito, Naoki Hiroyoshi

  JOURNAL OF HAZARDOUS MATERIALS 399 0304-3894 2020/11 

  Acid mine drainage (AMD) formation and toxic arsenic (As) pollution are serious environmental problems encountered worldwide. In this study, we investigated the crucial roles played by common secondary mineral phases formed during the natural weathering of pyrite-bearing wastes soluble salts (melanterite, FeSO4 center dot 7H(2)0) and metal oxides (hematite, Fe2O3)-on AMD formation and As mobility under acidic conditions (pH 1.5-4) prevalent in historic tailings storage facilities, pyrite-bearing rock dumps and AMD-contaminated soils and sediments. Our results using a pyrite-rich natural geological material containing arsenopyrite (FeAsS) showed that melanterite and hematite both directly-by supplying H+ and/or oxidants (Fe3+)-and indirectly-via changes in the nature of oxidation layer formed on pyrite-influenced pyrite oxidation dynamics. Based on SEM-EDS, DRIFT spectroscopy and XPS results, the oxidation layer on pyrite was mainly composed of ferric arsenate and K-Jarosite when melanterite was abundant with/without hematite but changed to Fe-oxyhydroxide/oxide and scorodite when melanterite was low and hematite was present This study also observed the formation of a mechanically 'strong' coaling on pyrite that suppressed the mineral's oxidation. Finally, As mobility under acidic conditions was limited by its precipitation as ferric arsenate, scorodite, or a Fe/Al arsenate phase, including its strong adsorption to Fe-oxyhydroxides/oxides.
• Kinetic Analysis for Agglomeration-Flotation of Finely Ground Chalcopyrite: Comparison of First Order Kinetic Model and Experimental Results

  Vothy Hornn, Mayumi Ito, Ryosuke Yamazawa, Hiromasa Shimada, Carlito Baltazar Tabelin, Sanghee Jeon, Ilhwan Park, Naoki Hiroyoshi

  61 (10) 2020/09 [Refereed]
  
• Immobilization of Lead and Zinc Leached from Mining Residual Materials in Kabwe, Zambia: Possibility of Chemical Immobilization by Dolomite, Calcined Dolomite, and Magnesium Oxide

  Pawit Tangviroon, Kenta Noto, Toshifumi Igarashi, Takeshi Kawashima, Mayumi Ito, Tsutomu Sato, Walubita Mufalo, Meki Chirwa, Imasiku Nyambe, Hokuto Nakata, Shouta Nakayama, Mayumi Ishizuka

  MINERALS 10 (9) 2020/09 

  Massive amount of highly contaminated mining residual materials (MRM) has been left unattended and has leached heavy metals, particularly lead (Pb) and zinc (Zn) to the surrounding environments. Thus, the performance of three immobilizers, raw dolomite (RD), calcined dolomite (CD), and magnesium oxide (MO), was evaluated using batch experiments to determine their ability to immobilize Pb and Zn, leached from MRM. The addition of immobilizers increased the leachate pH and decreased the amounts of dissolved Pb and Zn to different extents. The performance of immobilizers to immobilize Pb and Zn followed the following trend: MO > CD > RD. pH played an important role in immobilizing Pb and Zn. Dolomite in RD could slightly raise the pH of the MRM leachate. Therefore, the addition of RD immobilized Pb and Zn via adsorption and co-precipitation, and up to 10% of RD addition did not reduce the concentrations of Pb and Zn to be lower than the effluent standards in Zambia. In contrast, the presence of magnesia in CD and MO significantly contributed to the rise of leachate pH to the value where it was sufficient to precipitate hydroxides of Pb and Zn and decrease their leaching concentrations below the regulated values. Even though MO outperformed CD, by considering the local availability of RD to produce CD, CD could be a potential immobilizer to be implemented in Zambia.
• Detoxification of lead-bearing zinc plant leach residues from Kabwe, Zambia by coupled extraction-cementation method

  Marthias Silwamba, Mayumi Ito, Naoki Hiroyoshi, Carlito Baltazar Tabelin, Tomoki Fukushima, Ilhwan Park, Sanghee Jeon, Toshifumi Igarashi, Tsutomu Sato, Imasiku Nyambe, Meki Chirwa, Kawawa Banda, Hokuto Nakata, Shouta Nakayama, Mayumi Ishizuka

  Journal of Environmental Chemical Engineering 8 (4) 104197 - 104197 2213-3437 2020/08 [Refereed][Not invited]
  
• Agglomeration–Flotation of Finely Ground Chalcopyrite Using Emulsified Oil Stabilized by Emulsifiers: Implications for Porphyry Copper Ore Flotation

  Vothy Hornn, Mayumi Ito, Hiromasa Shimada, Carlito Baltazar Tabelin, Sanghee Jeon, Ilhwan Park, Naoki Hiroyoshi

  Metals 10 (7) 912 - 912 2020/07/08 [Refereed][Not invited]
   

  Flotation is the conventional method for processing porphyry copper deposits, one of the most economically important sources of copper (Cu) worldwide. The rapidly decreasing grade of this type of Cu ore in recent years, however, presents serious problems with fine particle recovery using conventional flotation circuits. This low recovery could be attributed to the low collision efficiency of fine particles and air bubbles during flotation. To improve collision efficiency and flotation recovery, agglomeration of finely ground chalcopyrite (CuFeS2) (D50 = 3.5 μm) using emulsified oil stabilized by emulsifiers was elucidated in this study. Specifically, the effects of various types of anionic (sodium dodecyl sulfate (SDS), potassium amyl xanthate (KAX)), cationic (dodecyl amine acetate (DAA)), and non-ionic (polysorbate 20 (Tween 20)) emulsifiers on emulsified oil stability and agglomeration–flotation efficiency were investigated. When emulsifiers were added, the average size of agglomerates increased, resulting in higher Cu recovery during flotation. This dramatic improvement in flotation efficiency could be attributed to the smaller oil droplet size in emulsified oil and their higher stability in the presence of emulsifiers. The utilization of emulsifiers during agglomeration–flotation not only lowered the required agitation strength for agglomeration but also shortened the agglomeration time, both of which made the process easier to incorporate in existing flotation circuits.
• Depression of lead-activated sphalerite by pyrite via galvanic interactions: Implications to the selective flotation of complex sulfide ores

  Kosei Aikawa, Mayumi Ito, Tatsuya Segawa, Sanghee Jeon, Ilhwan Park, Carlito Baltazar Tabelin, Naoki Hiroyoshi

  Minerals Engineering 152 106367 - 106367 0892-6875 2020/06 [Refereed][Not invited]
  
• Redox potential-dependent chalcopyrite leaching in acidic ferric chloride solutions: Leaching experiments

  Nguyen Thi Phuong Thao, Shushi Tsuji, Sanghee Jeon, Ilhwan Park, Carlito Baltazar Tabelin, Mayumi Ito, Naoki Hiroyoshi

  Hydrometallurgy 194 105299 - 105299 0304-386X 2020/06 [Refereed][Not invited]
  
• Jig separation of crushed plastics: the effects of particle geometry on separation efficiency

  Theerayut Phengsaart, Mayumi Ito, Arisa Azuma, Carlito Baltazar Tabelin, Naoki Hiroyoshi

  Journal of Material Cycles and Waste Management 22 (3) 787 - 800 1611-8227 2020/05/01 

  Secondary resources (i.e., wastes) contain a wide variety of materials (e.g., plastics, metals, and wood) of various sizes and shapes that complicate separation especially when using gravity-based separation techniques. In this study, the effects of particle geometry (i.e., size and shape) on jig separation of crushed plastics were investigated. Plastic boards with 2-mm and 3-mm thicknesses of acrylonitrile butadiene styrene (ABS, specific gravity (SG) = 1.03) and polystyrene (PS, SG = 1.06) were crushed to obtain a size fraction of + 2.0–8.0 mm. The shape distribution in each size fraction (+ 2.0–2.8, + 2.8–4.0, + 4.0–5.6, and + 5.6–8.0 mm) showed the strong effects of crushing on particle shape that is, particles are more disk-like at coarser size fraction but becomes more sphere-like at finer size fraction. Settling velocity of sphere-like PS increased with increasing particle size while those of disk-like ABS had similar values regardless of the size, which were consistent with the results of jig separation of single-type plastics. The results of jig separation of mixed-type plastics showed that separation efficiency was higher for the mixture of light, disk-like particles (ABS) and heavy, sphere-like particles (PS).
• Agglomeration-Flotation of Finely Ground Chalcopyrite and Quartz: Effects of Agitation Strength during Agglomeration Using Emulsified Oil on Chalcopyrite

  Vothy Hornn, Mayumi Ito, Hiromasa Shimada, Carlito Baltazar Tabelin, Sanghee Jeon, Ilhwan Park, Naoki Hiroyoshi

  Minerals 10 (4) 380 - 380 2020/04/23 [Refereed][Not invited]
   

  In flotation, the size of mineral particles is one of the most important parameters: when the size becomes fine, collision efficiency of the particles and air bubbles becomes low, causing low flotation recovery. To improve the collision efficiency and flotation kinetics, agglomeration using the emulsified oil of finely ground chalcopyrite (D50 = 3.5 μm) was carried out before flotation. In this study, the effects of agitation strength during agglomeration, kerosene dosage and potassium amyl xanthate (KAX) dosage on the flotation were investigated. Agglomeration using emulsified oil improved Cu recovery because the median diameter of agglomerate increased. With increasing agitation strength, KAX and kerosene dosages, Cu recovery was further increased. Agglomeration-flotation of a mixture containing chalcopyrite and quartz with 1:1 ratio (w/w, weight by weight) showed that Si recovery in froth was low and did not change with varying conditions (agitation strength, KAX and kerosene dosages); however, Cu recovery was significantly improved with increasing agitation strength, KAX and kerosene dosages, and thus the separation efficiency was improved.
• Recovery of Lead and Zinc from Zinc Plant Leach Residues by Concurrent Dissolution-Cementation Using Zero-Valent Aluminum in Chloride Medium

  Marthias Silwamba, Mayumi Ito, Naoki Hiroyoshi, Carlito Baltazar Tabelin, Ryota Hashizume, Tomoki Fukushima, Ilhwan Park, Sanghee Jeon, Toshifumi Igarashi, Tsutomu Sato, Meki Chirwa, Kawawa Banda, Imasiku Nyambe, Hokuto Nakata, Shouta Nakayama, Mayumi Ishizuka

  Metals 10 (4) 531 - 531 2020/04/20 [Refereed][Not invited]
   

  Zinc plant leach residues (ZPLRs) contain significant amounts of metal compounds of lead (Pb), zinc (Zn), iron (Fe), etc., hence, they are considered as a secondary source of metals. On the other hand, ZPLRs are regarded as hazardous materials because they contain heavy metals that pollute the environment. Resources and environmental concerns of ZPLRs were addressed in this study by removing/recovering Pb and Zn using a concurrent dissolution and cementation technique. To cement the dissolved Pb and Zn in leaching pulp, zero-valent aluminum (ZVAl) was added during ZPLRs leaching in the hydrochloric (HCl)–sodium chloride (NaCl) solution. The resulting cemented metals were agglomerated and separated by sieving. Lead removal increased with increasing both NaCl and HCl concentrations. However, when ZVAl was added, significant Pb removal was achieved at a low concentration. Zinc was not cemented out of the pulp using ZVAl and its recovery from ZPLRs was dependent on the HCl concentration only. By applying a concurrent dissolution and cementation technique, both Pb and Zn were removed using a low concentration of NaCl, and most importantly Pb—the most toxic metal in ZPLRs—was captured and separated before the solid-liquid separation, hence, eliminating the need for extensive washing of the generated residues to remove the inherent residual solution.
• Improved pyrolysis behavior of ammonium polyphosphate-melamine-expandable (APP-MEL-EG) intumescent fire retardant coating system using ceria and dolomite as additives for I-beam steel application

  Joshua B. Zoleta, Gevelyn B. Itao, Vannie Joy T. Resabal, Arnold A. Lubguban, Ryan D. Corpuz, Mayumi Ito, Naoki Hiroyoshi, Carlito Baltazar Tabelin

  Heliyon 6 (1) 2405-8440 2020/01/01 

  This study describes the effects of ceria (CeO2) and dolomite [CaMg(CO3)2] additives on the pyrolysis behavior and fire resistive property of conventional intumescent flame retardant (IFR) coating system for I-beam steel substrate called ammonium polyphosphate-melamine-expandable graphite (APP-MEL-EG) system. The fire resistance of various formulations was evaluated using the standard vertical Bunsen burner fire test. Thermogravimetric analysis (TGA) was used to understand the degradation of coating formulations. Observations by scanning electron microscopy with energy dispersive X-ray spectroscopy (SEM-EDX) demonstrated that significant amounts of additives favored the formation of homogeneous compacted char structures, which were predominantly composed of carbon (C), phosphorus (P) and oxygen (O). These three main components of the char were also found to be in various binding combinations with other lighter elements like nitrogen (N) and hydrogen (H) as illustrated by the attenuated total reflectance Fourier transform infrared (ATR-FTIR) spectroscopy results. X-ray photoelectron spectroscopy (XPS) further suggest that polyethylene([(CH2–C2H2–CH2)n−]) free radicals were abundant on the char surface for the two best formulations and the binding energy of this radical promoted the formation of aromatic carbon chains that enhanced the char's thermal stability. This means that the selection of appropriate additives and combinations of flame-retardant ingredients could significantly change the morphology of the char layer and improve its thermal stability during fire exposure. Chemical engineering Materials chemistry Materials science Intumescent coating Char formation Ceria I-beam Thermal stability Ammonium polyphosphate Pyrolysis Fire retardant Dolomite XPS
• Enhanced cementation of gold via galvanic interactions using activated carbon and zero-valent aluminum: A novel approach to recover gold ions from ammonium thiosulfate medium

  Sanghee Jeon, Carlito Baltazar Tabelin, Hirotaka Takahashi, Ilhwan Park, Mayumi Ito, Naoki Hiroyoshi

  Hydrometallurgy 191 0304-386X 2020/01/01 

  In gold (Au) hydrometallurgy, ammonium thiosulfate is the most attractive and promising alternative to conventional lixiviants like cyanide or the halides because it is non-toxic, less corrosive and has high selectivity for Au. However, its industrial-scale application for Au extraction is still severely limited because the recovery of dissolved Au from pregnant solutions remains challenging. The present study proposes a novel, simple and effective technique to address this difficulty using zero-valent aluminum (ZVAl) and activated carbon. Gold recovery was investigated by mixing 0.15 g of ZVAl and/or activated carbon and 10 ml of a solution containing 1 M Na2S2O3, 0.5 M NH3, 0.25 M (NH4)2SO4 and 10 mM CuSO4 with 100 mg/l of dissolved Au in a constant temperature water bath shaker at 25 °C for 24 h. Gold recovery from the ammonium thiosulfate solution was negligible when only ZVAl or activated carbon was added. When ZVAl and activated carbon were both present in the ammonium thiosulfate solution, however, over 99% of Au ions were successfully recovered. Scanning electron microscopy with energy dispersive X-ray spectroscopy (SEM-EDX) observations of the solid residues indicate that Au was predominantly deposited on activated carbon attached to ZVAl. Based on the rest potentials of these two materials, their synergistic effect on Au recovery could be attributed to the formation of numerous galvanic cells in solution where ZVAl acted as anodes (i.e., primary electron donor) while activated carbon acted as the cathode onto which Au ions are reduced via cementation to elemental Au.
• Carrier-microencapsulation of arsenopyrite using Al-catecholate complex: nature of oxidation products, effects on anodic and cathodic reactions, and coating stability under simulated weathering conditions

  Ilhwan Park, Carlito Baltazar Tabelin, Kensuke Seno, Sanghee Jeon, Hiroyuki Inano, Mayumi Ito, Naoki Hiroyoshi

  Heliyon 6 (1) e03189 - e03189 2405-8440 2020/01 [Refereed][Not invited]
  
• Ammonium thiosulfate extraction of gold from printed circuit boards (PCBs) of end-of-life mobile phones and its recovery from pregnant leach solution by cementation

  Sanghee Jeon, Carlito Baltazar Tabelin, Ilhwan Park, Yoshito Nagata, Mayumi Ito, Naoki Hiroyoshi

  Hydrometallurgy 191 105214 - 105214 0304-386X 2020/01 [Refereed][Not invited]
  
• Development of advanced pyrite passivation strategies towards sustainable management of acid mine drainage

  C. B. Tabelin, I. Park, X. Li, S. Seng, M. Villacorte-Tabelin, T. Igarashi, M. Ito, N. Hiroyoshi

  IOP Conference Series: Earth and Environmental Science 351 (1) 1755-1315 2019/10/28 

  Acid mine drainage (AMD) is one of the most serious environmental problems encountered in mining areas worldwide. When released into the environment without treatment, AMD pollutes the surrounding water bodies and soils with hazardous and toxic elements like arsenic (As), selenium (Se) and heavy metals such as lead (Pb), cadmium (Cd), copper (Cu) and zinc (Zn) that rapidly destroy affected ecosystems. The most commonly used method to treat AMD is chemical neutralization, a technique whereby basic materials like limestone or lime are mixed with AMD to raise its pH and remove most of the contaminants via precipitation. Although effective, this approach requires the continuous supply of chemicals, energy, and manpower, which makes it unsustainable because AMD generation has been documented to continue for a very long time (up to several centuries to millennia). One promising alternative to chemical neutralization is (micro) encapsulation, a technique that directly treats pyrite, the main mineral responsible for AMD formation, and renders it unreactive by encapsulating the mineral with protective coatings. In this study, we introduced two advanced pyrite passivation techniques to limit AMD formation called "carrier-microencapsulation" (CME) and "galvanic microencapsulation" (GME). CME uses a redox-reactive organic carrier to deliver the coating material on the surface of pyrite. Because the carrier only decomposes oxidatively, the primary strength of this technique is its high selectivity for pyrite even in complex systems like mine tailings and pyrite-rich waste rocks. Meanwhile, GME is based on galvanic interactions between pyrite and metals with lower rest potentials so this technique could be applied directly in a ball mill during ore processing or coal cleaning.
• Hematite-catalysed scorodite formation as a novel arsenic immobilisation strategy under ambient conditions

  Tabelin Carlito Baltazar, Corpuz Ryan D, Iarashi Toshifumi, Villacorte-Tabelin Mylah, Ito Mayumi, Hiroyoshi Naoki

  CHEMOSPHERE 233 946 - 953 0045-6535 2019/10 [Refereed][Not invited]
  
• Solidification of sand by Pb(II)-tolerant bacteria for capping mine waste to control metallic dust: Case of the abandoned Kabwe Mine, Zambia.

  Wilson Mwandira, Kazunori Nakashima, Satoru Kawasaki, Mayumi Ito, Tsutomu Sato, Toshifumi Igarashi, Meki Chirwa, Kawawa Banda, Imasiku Nyambe, Shouta Nakayama, Hokuto Nakata, Mayumi Ishizuka

  Chemosphere 228 17 - 25 0045-6535 2019/08 [Refereed][Not invited]
   

  Environmental impacts resulting from historic lead and zinc mining in Kabwe, Zambia affect human health due to the dust generated from the mine waste that contains lead, a known hazardous pollutant. We employed microbially induced calcium carbonate precipitation (MICP), an alternative capping method, to prevent dust generation and reduce the mobility of contaminants. Pb-resistant Oceanobacillus profundus KBZ 1-3 and O. profundus KBZ 2-5 isolated from Kabwe were used to biocement the sand that would act as a cover to prevent dust and water infiltration. Sand biocemented by KBZ 1-3 and KBZ 2-5 had maximum unconfined compressive strength values of 3.2 MPa and 5.5 MPa, respectively. Additionally, biocemented sand exhibited reduced water permeability values of 9.6 × 10-8 m/s and 8.9 × 10-8 m/s for O. profundus KBZ 1-3 and KBZ 2-5, respectively, which could potentially limit the entrance of water and oxygen into the dump, hence reducing the leaching of heavy metals. We propose that these isolates represent an option for bioremediating contaminated waste by preventing both metallic dust from becoming airborne and rainwater from infiltrating into the waste. O. profundus KBZ 1-3 and O. profundus KBZ 2-5 isolated form Kabwe represent a novel species that has, for the first time, been applied in a bioremediation study.
• Efficacy of biocementation of lead mine waste from the Kabwe Mine site evaluated using Pararhodobacter sp.

  Wilson Mwandira, Kazunori Nakashima, Satoru Kawasaki, Mayumi Ito, Tsutomu Sato, Toshifumi Igarashi, Kawawa Banda, Meki Chirwa, Imasiku Nyambe, Shouta Nakayama, Mayumi Ishizuka

  Environmental science and pollution research international 26 (15) 15653 - 15664 0944-1344 2019/05 [Refereed][Not invited]
   

  Biocementation of hazardous waste is used in reducing the mobility of contaminants, but studies on evaluating its efficacy have not been well documented. Therefore, to evaluate the efficacy of this method, physicochemical factors affecting stabilized hazardous products of in situ microbially induced calcium carbonate precipitation (MICP) were determined. The strength and leach resistance were investigated using the bacterium Pararhodobacter sp. Pb-contaminated kiln slag (KS) and leach plant residue (LPR) collected from Kabwe, Zambia, were investigated. Biocemented KS and KS/LPR had leachate Pb concentrations below the detection limit of < 0.001 mg/L, resisted slaking, and had maximum unconfined compressive strengths of 8 MPa for KS and 4 MPa for KS/LPR. Furthermore, biocemented KS and KS/LPR exhibited lower water absorption coefficient values, which could potentially reduce the water transportation of Pb2+. The results of this study show that MICP can reduce Pb2+ mobility in mine wastes. The improved physicochemical properties of the biocemented materials, therefore, indicates that this technique is an effective tool in stabilizing hazardous mine wastes and, consequently, preventing water and soil contamination.
• Development of suitable product recovery systems of continuous hybrid jig for plastic-plastic separation

  M. Ito, A. Saito, N. Murase, T. Phengsaart, S. Kimura, C.B. Tabelin, N. Hiroyoshi

  Minerals Engineering 2019 [Refereed][Not invited]
  
• Galvanic Microencapsulation (GME) Using Zero-Valent Aluminum and Zero-Valent Iron to Suppress Pyrite Oxidation.

  S. Seng, C.B. Tabelin, M. Kojima, N. Hiroyoshi, M. Ito

  Materials Transactions 60 277 - 286 2019 [Refereed][Not invited]
  
• A review of recent strategies for acid mine drainage prevention and mine tailings recycling.

  I. Park, C.B. Tabelin, S. Jeon, X. Li, K. Seno, M. Ito, N. Hiroyoshi

  Chemosphere 219 588 - 606 2019 [Refereed][Not invited]
  
• Suppression of pyrite oxidation by ferric-catecholate complexes: An electrochemical study

  X. Li, M. Gao, N. Hiroyoshi, C.B. Tabelin, T. Taketsugu, M. Ito

  Minerals Engineering 138 226 - 237 2019 [Refereed][Not invited]
  
• Suppressive effects of ferric-catecholate complexes on pyrite oxidation

  X. Li, N. Hiroyoshi, C.B. Tabelin, K. Naruwa, C. Harada, M. Ito

  Chemosphere 214 70 - 78 2019 [Refereed][Not invited]
  
• A physical separation scheme to improve ammonium thiosulfate leaching of gold by separation of base metals in crushed mobile phones

  S. Jeon, M. Ito, C.B. Tabelin, R. Pongsumrankul, S. Tanaka, N. Kitajima, A. Saito, I. Park, N. Hiroyoshi

  Minerals Engineering 138 168 - 177 2019 [Refereed][Not invited]
  
• Simultaneous suppression of acid mine drainage formation and arsenic release by Carrier-microencapsulation using aluminum-catecholate complexes (vol 205C, pg 414, 2018)

  Park Ilhwan, Tabelin Carlito Baltazar, Seno Kensuke, Jeon Sanghee, Ito Mayumi, Hiroyoshi Naoki

  CHEMOSPHERE 209 1021  0045-6535 2018/10 [Refereed][Not invited]
  
• Gold recovery from shredder light fraction of E-waste recycling plant by flotation-ammonium thiosulfate leaching

  Sanghee Jeon, Mayumi Ito, Carlito Baltazar Tabelin, Rongrit Pongsumrankul, Naho Kitajima, llhwan Park, Naoki Hiroyoshi

  Waste Management 77 195 - 202 1879-2456 2018/07/01 [Refereed][Not invited]
   

  This paper describes the recovery of gold (Au) from shredder light fraction (SLF) of a recycling plant by flotation and leaching. SLF is typically sent to landfills as waste, but it still contains substantial amounts of Au, and other metals like Cu and Fe. The SLF sample used in this study contains 0.003% of Au, 12% of Cu, and 10% of Fe. Flotation results showed that over 99% of Au and 50% of combustibles were recovered in froth while most of the base metals were recovered in tailing. SEM-EDX of froth products indicates that Au floated via two mechanisms: (1) flotation of Au-plated plastic particles, and (2) agglomeration of fine Au particles together with plastic particles due to kerosene-induced hydrophobic-hydrophobic interactions followed by the flotation of these agglomerated particles. Combustibles in froth/tailing were analyzed by ATR-FTIR, and the results showed that plastics in the froth were mostly sulfonated polystyrene (PS) and acrylonitrile butadiene styrene (ABS) while those in tailing were polyurethane (PU) and polyethylene terephthalate (PET). Contact angle measurements of plastic particles suggest that PS and ABS are more hydrophobic than PU and PET. Most of the base metals in the tailing had either bent or twisted shapes because they were mostly made up of wires. In flotation, these large and heavy particles are unaffected by bubbles and simply sink. Leaching results using ammonium thiosulfate solutions showed that Au extraction increased from 33 to 51% after flotation.
• Simultaneous suppression of acid mine drainage formation and arsenic release by Carrier-microencapsulation using aluminum-catecholate complexes

  I. Park, C.B. Tabelin, K. Seno, S. Jeon, M. Ito, N. Hiroyoshi

  Chemosphere 205 414 - 425 2018 [Refereed][Not invited]
  
• Suppression of the release of arsenic from arsenopyrite by carrier-microencapsulation using Ti-catechol complex

  I. Park, C.B. Tabelin, K. Magaribuchi, K. Seno, M. Ito, N. Hiroyoshi

  Journal of Hazardous Materials 344 322 - 332 2018 [Refereed][Not invited]
  
• Arsenic, selenium, boron, lead, cadmium, copper, and zinc in naturally contaminated rocks: A review of their sources, modes of enrichment, mechanisms of release, and mitigation strategies

  C.B. Tabelin, T. Igarashi, M. Villacorte-Tabelin, I. Park, E.M. Opiso, M. Ito, N. Hiroyoshi

  Science of The Total Environment 645 1522 - 1553 2018 [Refereed][Not invited]
  
• Interference of coexisting copper and aluminum on the ammonium thiosulfate leaching of gold from printed circuit boards of waste mobile phones

  S. Jeon, C.B. Tabelin, H. Takahashi, I. Park, M. Ito, N. Hiroyoshi

  Waste Management 81 148 - 156 2018 [Refereed][Not invited]
  
• Improvement of jig efficiency by shape separation, and a novel method to estimate the separation efficiency of metal wires in crushed electronic wastes using bending behavior and “entanglement factor”

  T. Phengsaart, M. Ito, N. Hamaya, C.B. Tabelin, N. Hiroyoshi

  Minerals Engineering 129 54 - 62 2018 [Refereed][Not invited]
  
• Simultaneous leaching of arsenite, arsenate, selenite and selenate, and their migration in tunnel-excavated sedimentary rocks: II. Kinetic and reactive transport modeling

  Carlito Baltazar Tabelin, Ryosuke Sasaki, Toshifumi Igarashi, Ilhwan Park, Shuichi Tamoto, Takahiko Arima, Mayumi Ito, Naoki Hiroyoshi

  CHEMOSPHERE 188 444 - 454 0045-6535 2017/12 [Refereed][Not invited]
   

  Predicting the fates of arsenic (As) and selenium (Se) in natural geologic media like rocks and soils necessitates the understanding of how their various oxyanionic species behave and migrate under dynamic conditions. In this study, geochemical factors and processes crucial in the leaching and transport of arsenite (As-III), arsenate (As-V), selenite (Se-IV) and selenate (Se-VI) in tunnel-excavated rocks of marine origin were investigated using microscopic/extraction techniques, column experiments, dissolution-precipitation kinetics and one-dimensional reactive transport modeling. The results showed that evaporite salts were important because aside from containing As and Se, they played crucial roles in the evolution of pH and concentrations of coexisting ions, both of which had strong effects on adsorption-desorption reactions of As and Se species with iron oxyhydroxide minerals/phases. The observed leaching trends of As-V, As-III, Se-IV and Se-VI were satisfactorily simulated by one-dimensional reactive transport models, which predict that preferential adsorptions of As-V and Se-IV were magnified by geochemical changes in the columns due to water flow. Moreover, our results showed that migrations of As-III, Se-IV and Se-VI could be predicted adequately by 1D solute transport with simple activity-K '(d) approach, but surface complexation was more reliable to simulate adsorption-desorption behavior of As-V. (C) 2017 Elsevier Ltd. All rights reserved.
• Simultaneous leaching of arsenite, arsenate, selenite and selenate, and their migration in tunnel-excavated sedimentary rocks: I. Column experiments under intermittent and unsaturated flow

  Carlito Baltazar Tabelin, Ryosuke Sasaki, Toshifumi Igarashi, Ilhwan Park, Shuichi Tamoto, Takahiko Arima, Mayumi Ito, Naoki Hiroyoshi

  CHEMOSPHERE 186 558 - 569 0045-6535 2017/11 [Refereed][Not invited]
   

  Rocks excavated in tunnel construction projects for roads and railways throughout Japan often leached out hazardous trace elements like arsenic (As) and selenium (Se) upon their exposure to the environment. In nature, the various oxyanionic species of As and Se not only coexist but also exhibit contrasting adsorption-desorption behaviors, so speciation is a crucial factor in their migration through natural geologic media. In this study, the leaching and transport of arsenite (As-III), arsenate (As-V), selenite (Sew) and selenate (Se-VI) in four tunnel-excavated rocks from the Cretaceous-Paleocene Yezo forearc basin were investigated using laboratory column experiments supplemented by batch leaching experiments. The single- and consecutive-batch leaching results revealed that As-III, As-V, Se-IV and Se-VI were released simultaneously, which could be attributed to the rapid dissolution of trace evaporite salts found in the rocks. Arsenic in the leachates was also predominated by As-V while Se-IV and Se-VI concentrations were nearly equal, which are both consistent with predictions of equilibrium Eh-pH diagrams. Under intermittent and unsaturated flow, however, periods when As-III and Se-VI predominated in the effluents were observed. Spatial distributions of As and Se species with depth at the end of the column experiments suggest that migrations of As-III, As-V and Se-IV were delayed, the extent of which depended on the rock. These results indicate that migration and speciation of As and Se in the rocks are controlled by preferential adsorption-desorption reactions, the effects of which were most probably magnified by changes in the pH and concentrations of coexisting ions due to intermittent and unsaturated flow. (C) 2017 Elsevier Ltd. All rights reserved.
• Pyrite oxidation in the presence of hematite and alumina: II. Effects on the cathodic and anodic half-cell reactions

  Carlito Baltazar Tabelin, Suchol Veerawattananun, Mayumi Ito, Naoki Hiroyoshi, Toshifumi Igarashi

  SCIENCE OF THE TOTAL ENVIRONMENT 581 126 - 135 0048-9697 2017/03 [Refereed][Not invited]
   

  The oxidative dissolution of pyrite is an important process in the redox recycling of iron (Fe) and is well-known for its role in the formation of acid mine drainage (AMD), which is considered as the most serious and widespread problem after the closure of mines and mineral processing operations. Because thiS process requires the movement of electrons, common metal oxides in nature that have either semiconducting (e.g., hematite) or insulating (e.g., alumina) properties may have strong effects on it. In this study, changes in the electrochemical behavior of pyrite in the presence of hematite and alumina were investigated. Results showed that the formation of surface bound species directly influenced the anodic and cathodic half-cell reactions as well as the transfer of electrons between these sites. Pyrite pretreated in the air became anodically more reactive than that pretreated in oxygenated water, but the type of oxidizing media had little effect on the cathodic half-cell reaction. The presence of hematite and alumina during pretreatment also had strong effects on the electrochemical properties of pyrite. Chronoamperometry measurements suggest that hematite and alumina enhanced the anodic half-cell reaction but suppressed the cathodic half-cell reaction of pyrite oxidation. Increased anodic half-cell reaction in the presence of hematite could be attributed to electron "bridging" and catalytic effects of this mineral. In contrast, the effects of alumina on the anodic half-cell reaction were indirect and could be explained by the formation of Fe3+-oxyhydroxide surface species during pretreatment. Suppression of the cathodic half-cell reaction by both minerals was attributed to their "protective" effect on cathodic sites. Our results also point to the cathodic half cell reaction as the rate determining-step of the overall oxidative dissolution process.
• Pyrite oxidation in the presence of hematite and alumina: I. Batch leaching experiments and kinetic modeling calculations

  Carlito Baltazar Tabelin, Suchol Veerawattananun, Mayumi Ito, Naoki Hiroyoshi, Toshifumi Igarashi

  SCIENCE OF THE TOTAL ENVIRONMENT 580 687 - 698 0048-9697 2017/02 [Refereed][Not invited]
   

  Pyrite is one of the most common and geochemically important sulfide minerals in nature because of its role in the redox recycling of iron (Fe). It is also the primary cause of acid mine drainage (AMD) that is considered as a serious and widespread problem facing the mining and mineral processing industries. In the environment, pyrite oxidation occurs in the presence of ubiquitous metal oxides, but the roles that they play in this process remain largely unknown. This study evaluates the effects of hematite (alpha-Fe2O3) and alumina (alpha-Al2O3) on pyrite oxidation by batch-reactor type experiments, surface-sensitive characterization of the oxidation layer and thermodynamic/kinetic modeling calculations. In the presence of hematite, dissolved sulfur (S) concentration dramatically decreased independent of the pH, and the formation of intermediate sulfoxy anionic species on the surface of pyrite was retarded. These results indicate that hematite minimized the overall extent of pyrite oxidation, but the kinetic model could not explain how this suppression occurred. In contrast, pyrite oxidation was enhanced in the alumina suspension as suggested by the higher dissolved S concentration and stronger infrared (IR) absorption bands of surface-bound oxidation products. Based On the kinetic model, alumina enhanced the oxidative dissolution of pyrite because of its strong acid buffering capacity, which increased the suspension pH. The higher pH values increased the oxidation of Fe2+ to Fe3+ by dissolved O-2 (DO) that enhanced the overall oxidative dissolution kinetics of pyrite. (C) 2016 Elsevier B.V. All rights reserved.
• Formation of schwertmannite-like and scorodite-like coatings on pyrite and its implications in acid mine drainage control. In: E. Peek, M. Buarzaiga and J. Dutrizac, Eds., Iron Control – Practice and Research, (e-book). Quebec

  C.B. Tabelin, R.D. Corpuz, S. Veerawattananun, M. Ito, N. Hiroyoshi, T. Igarashi

  Canadian Institute of Mining, Metallurgy and Petroleum 133 - 144 2016 [Refereed][Not invited]
  
• A Study on the Utilization of Magnetite for the Recovery of Platinum Group Metals from Chloride Solution

  Peet Homchuen, Richard Diaz Alorro, Naoki Hiroyoshi, Ryo Sato, Hajime Kijitani, Mayumi Ito

  MINERAL PROCESSING AND EXTRACTIVE METALLURGY REVIEW 37 (4) 246 - 254 0882-7508 2016 [Refereed][Not invited]
   

  The recovery of platinum group metals (PGMs) from chloride solution using magnetite was investigated. The adsorption of platinum, palladium, and rhodium in chloride medium onto synthetic magnetite powders were studied at different pH conditions, contact time, sodium chloride concentrations, and initial Pt, Rh, and Pd concentrations. Platinum and palladium uptake by magnetite was at a maximum at pH 6-7, and pH 3-4 for rhodium after 24 h with 0.1 mol/dm(3) sodium chloride at an initial PGM concentration of 0.05 mol/m(3). A sorption mechanism for PGMs was discussed based on the results.
• Electrochemical Investigation of Gold Uptake From Chloride Solution by Magnetite

  Richard Diaz Alorro, Naoki Hiroyoshi, Hajime Kijitani, Mayumi Ito, Masami Tsunekawa

  MINERAL PROCESSING AND EXTRACTIVE METALLURGY REVIEW 36 (5) 332 - 339 0882-7508 2015/09 [Refereed][Not invited]
   

  An electrochemical method (potential sweep method) was utilized to investigate the nature of the absorbed gold on magnetite and to determine the gold sorption mechanism. A magnetite electrode was prepared in the laboratory, made in contact with a gold chloride solution at different conditions, and was subjected to cyclic voltammetry. The cyclic voltammogram of the magnetite electrode pretreated in a gold chloride solution recorded an anodic current peak at around 1.0V (vs. Ag/AgCl), which corresponds to the current generated for the anodic dissolution of metallic gold in a chloride medium. The results of the electrochemical experiments suggest that gold chloride complexes are reduced to metallic gold on the surface of magnetite. A four-stage gold uptake mechanism was proposed: (i) the transport of [GRAPHICS] from the bulk solution to the magnetite surface, (ii) adsorption of [GRAPHICS] ions on magnetite surface by electrostatic attraction, (iii) electrochemical reduction of [GRAPHICS] to metallic Au, and (iv) the transport of soluble species to the solution phase. The electrochemical investigation also revealed that Fe3+ ions released from magnetite into the solution, suppressed the gold uptake at the acidic pH region.
• Partial cloning of CYP2C23a genes and hepatic protein expression in eight representative avian species

  K. P. Watanabe, Y. K. Kawai, S. M.M. Nakayama, Y. Ikenaka, H. Mizukawa, N. Takaesu, M. Ito, S. I. Ikushiro, T. Sakaki, M. Ishizuka

  Journal of Veterinary Pharmacology and Therapeutics 38 (2) 190 - 195 1365-2885 2015/04/01 [Refereed][Not invited]
   

  Large interspecies differences in avian xenobiotic metabolism have been revealed by microsome-based studies, but specific enzyme isoforms in different bird species have not yet been compared. We have previously shown that CYP2C23 genes are the most induced CYP isoforms in chicken liver. In this study, we collected partial CYP2C23a gene sequences from eight avian species (ostrich, blue-eared pheasant, snowy owl, great-horned owl, Chilean flamingo, peregrin falcon, Humboldt penguin, and black-crowned night heron) selected to cover the whole avian lineage: Paleognathae, Galloanserae, and Neoaves. Genetic analysis showed that CYP2C23 genes of Galloanserae species (chicken and blue-eared pheasant) had unique characteristics. We found some duplicated genes (CYP2C23a and CYP2C23b) and two missing amino acid residues in Galloanserae compared to the other two lineages. The genes have lower homology than in other avian lineages, which suggests Galloanserae-specific rapid evolutionary changes. These genetic features suggested that the Galloanserae are not the most representative avian species, considering that the Neoaves comprise more than 95% of birds. Moreover, we succeeded in synthesizing an antipeptide polyclonal antibody against the region of CYP2C23 protein conserved in avians. However, comparative quantitation of CYP2C23 proteins in livers from six species showed that expression levels of these proteins differed no more than fourfold. Further study is needed to clarify the function of avian CYP2C23 proteins.
• Short and long term release mechanisms of arsenic, selenium and boron from a tunnel-excavated sedimentary rock under in situ conditions

  Shuichi Tamoto, Carlito Baltazar Tabelin, Toshifumi Igarashi, Mayumi Ito, Naoki Hiroyoshi

  JOURNAL OF CONTAMINANT HYDROLOGY 175 60 - 71 0169-7722 2015/04 [Refereed][Not invited]
   

  Sedimentary rocks of marine origin excavated from tunnel construction projects usually contain background levels of hazardous trace elements, but when exposed to the environment, they generate leachates with concentrations of arsenic (As), selenium (Se) and boron (B) exceeding the WHO guideline for drinking water. In this study, the leaching of As, Se and B was evaluated under in situ conditions at various flow patterns, particle size distributions and column thicknesses. The results showed that these trace elements were leached out of the rock via short and long term mechanisms. In the short term, all three elements were rapidly and simultaneously released due to the dissolution of soluble evaporite salts formed from entrapped sea water of the Cretaceous. After their rapid release, however, these trace elements behaved differently as a result of their contrasting adsorption affinities onto minerals like clays and Feoxyhydroxides, which were further influenced by the pH, presence of coexisting ions and speciation of the trace elements. Selenium was quickly and easily transported out of the columns because it was mostly present as the very mobile selenate ion (Se[VI]). In comparison, the migration of As and B was hindered by adsorption reactions onto mineral phases of the rock Boron was initially the least mobile among the three because of its preferential adsorption onto clay minerals that was further enhanced by the slightly alkaline pH and high concentrations of Ca2+ and Na+. However, it was gradually re-mobilized in the latter part of the experiments because it was only weakly adsorbed via outer sphere complexation reactions. In the long term, the rock continued to release substantial amounts of As, Se and B via pyrite oxidation and adsorption/desorption reactions, which were regulated by the temperature and rainfall intensity/frequency on site. (C) 2015 Elsevier B.V. All rights reserved.
• Stability of As(V)-sorbed schwertmannite under porphyry copper mine conditions

  Sengpasith HoungAloune, Naoki Hiroyoshi, Mayumi Ito

  MINERALS ENGINEERING 74 51 - 59 0892-6875 2015/04 [Refereed][Not invited]
   

  Arsenic (As), a very poisonous inorganic pollutant is a major toxicant in tailings of porphyry copper deposits. Retention of As by Schwertmannite (a ferric-oxyhydroxysulfate mineral) has attracted much attention in recent years due to its strong binding affinity to toxic As species. The stability of As(V)-sorbed schwertmannite under copper mine waste conditions is not fully understood. The present study investigates the effect of Cu2+, Fe2+, pH, and ageing time on the stability of As(V)-sorbed schwertmannite (Sch-As). The results indicate that Cu2+ has no significant effect on the stability of Sch-As and that the As(V) incorporated in schwertmannite can retard or significantly inhibit Fe2+-catalyzed transformation of schwertmannite to goethite under acidic conditions (pH 3-4). The Sch-As aged at different pHs from 3 to 11 at 25 degrees C exhibits no mineralogical phase changes even after ageing for 120-days; however the concentration of As released from the solid phase appears to be strongly pH-dependent even after ageing for only 24 h. The release of As was negligible at pHs from 2 to 7, and there was considerableTelease of As at extremely acidic and alkaline conditions. This indicates that the release of As from Sch-As was controlled by environmental factors such as pH, Cu2+, and Fe2+ rather than time. (C)) 2015 Elsevier Ltd. All rights reserved.
• Effect of Fe(II) and Cu(II) on transformation of schwertmannite to goethite

  S. Houngaloune, N. Hiroyoshi, M. Ito

  International Journal of Chemical Engineering and Applications 6 (1) 32 - 37 2015 [Refereed][Not invited]
  
• Study on schwertmannite production from copper heap leach solutions and its efficiency in arsenic removal from acidic sulfate solutions

  Sengpasith HoungAloune, Takahiro Kawaai, Naoki Hiroyoshi, Mayumi Ito

  HYDROMETALLURGY 147 30 - 40 0304-386X 2014/08 [Refereed][Not invited]
   

  Schwertmannite, a ferric oxyhydroxy sulfate mineral, has gained attention in recent years due to its high sorption capacity for toxic arsenic species. In porphyry copper mines, production of schwertmannite from heap leaching solutions may be possible because the solutions contain high concentrations of ferric and sulfate ions, which are components of schwertmannite. The present study investigates the effect of Cu2+ and Fe2+, coexisting ions in heap leaching solutions, on the synthesis of schwertmannite; as well as the efficiency of As(V) removal from acidic solutions by the synthesized products. Synthesis was carried out by neutralization of 50 mM Fe-2(SO4)(3) solutions at 65 degrees C (final pH: 3-4), and the synthesized products were characterized by XRD. The results indicated that Cu2+ does not affect the synthesis of schwertmannite, but that Fe2+ has a significant influence on the synthesis; transformation of intermediate schwertmannite to goethite occurred in the presence of Fe2+. Schwertmannite was produced in the presence of both Cu2+ and Fe2+, suggesting that Cu2+ inhibits the transformation of schwertmannite to goethite in the presence of Fe2+. To confirm this, the transformation of schwertmannite to goethite was investigated in solutions containing Fe2+ and Cu2+ at pH 3-4 and 65 degrees C. It was shown that a complete transformation to goethite occurred in 1 h in the presence of 100 mM Fe2+. However, 100 mM Cu2+ inhibited the transformation of schwertmannite to goethite in the presence of Fe2+. Batch sorption experiments were conducted to evaluate the As(V) sorption capacity of the synthesized products. The results showed that As(V) in acidic solutions (pH 3-4) can be removed effectively by synthesized schwertmannite with the maximum As(V) sorption capacity of 94-133 mg g(-1). A lower As(V) sorption capacity was observed in products containing goethite synthesized in the presence of Fe2+; here, the maximum As(V) sorption capacity was 58 mg g(-1). (C) 2014 Elsevier B.V. All rights reserved.
• Electrical disintegration and micro-focus X-ray CT observations of cement paste samples with dispersed mineral particles

  Sang Ho Cho, Mitsuhiro Yokota, Mayumi Ito, Satoru Kawasaki, Soo Bok Jeong, Byoung Kon Kim, Katsuhiko Kaneko

  MINERALS ENGINEERING 57 79 - 85 0892-6875 2014/03 [Refereed][Not invited]
   

  Electrical disintegration is an effective liberation technique in mineral processing where the liberation ratio depends on the mineralogical properties of the mineral grains. However elucidation of the liberation behavior is difficult since the fragments after the electrical disintegration are fine and complex. This study applies electrical disintegration to cement paste samples with various dispersed mineral particles (calcite, quartz, albite, and pyrite) and the disintegrated products are observed with a micro-focus X-ray CT scanner. Current channels and crack extension behavior from the channels are identified by cross sectional CT and three dimensional reconstructed images. A classification of the crack patterns was carried out and compared with the results of liberation ratio measurements of the products. (C) 2014 Elsevier Ltd. All rights reserved.
• Technological development in jig separation and approaches to adovance in separation

  M Tsunekawa, M Ito, N Hiroyoshi

  Journal of MMIJ 129 284 - 289 2013 [Refereed][Not invited]
  
• A method for determining optimum water pulsation parameter in jig separatiin using pressure and level sensors and its application to separation of fine particles

  M Tusnekawa, J Akimoto, W Ogiko, S Ochi, N Hiroyoshi, M Ito

  Journal of MMIJ 129 284 - 289 2013 [Refereed][Not invited]
  
• Newly developed discharge device for jig separation of plastics to recover higher grade bottom layer product

  Masami Tsunekawa, Riki Kobayashi, Kunihiro Hori, Hideaki Okada, Naka Abe, Naoki Hiroyoshi, Mayumi Ito

  INTERNATIONAL JOURNAL OF MINERAL PROCESSING 114 27 - 29 0301-7516 2012/11 [Refereed][Not invited]
   

  The jig is efficient in separating relatively low density particles such as plastics; however conventional discharge devices attached to jigs cause mechanical disruption of the stratified layers at the outlet from the separation chamber, and decrease the grade of the recovered bottom layer product. A new device was developed for efficiently separating high grade bottom layer product, better than 99%, where particles of the bottom and top layers are recovered as overflow products by agitation with water pulsation. (C) 2012 Elsevier B.V. All rights reserved.
• Effect of particle shape on hydrocyclone classification

  Kouki Kashiwaya, Takahiko Noumachi, Naoki Hiroyoshi, Mayumi Ito, Masami Tsunekawa

  POWDER TECHNOLOGY 226 147 - 156 0032-5910 2012/08 [Refereed][Not invited]
   

  Influence of particle shape on hydrocyclone classification was investigated. Classification tests using hydrocyclone and cyclosizer showed that coarse fractions of plate-like particles such as PTFE and glass flake used here were not necessarily recovered as underflow product, especially at relatively high inlet velocity. Settling velocity of the glass flake particles in centrifugal field was estimated using a centrifugal particle size analyzer, and it was revealed that differences in settling velocity between coarse and fine glass flake particles became smaller with increases in angular velocity. Moreover, settling test of glass plate in water or glycerin solution was conducted to know relationship between particle Reynolds number (Re) and settling velocity of the plate. At smaller Re condition, the glass plate settled straight and stably, and larger plate settled faster than smaller plate. However, oscillating motion of the plate occurred in the region of high Re, and settling velocities of the large plate became smaller than that of the small plate in such conditions. Drag coefficient (C) calculated based on the settling velocity of the glass plate is similar to that of glass spheres below Re of about 50, above which it became larger than that of glass sphere. Approximation formula of correlaton between Re and C suggests that the influence of the Re on C can be neglected in the region of high Re, and C increases with increases in the ratio of the particle diameter to thickness (D/T). The decrease of the difference in settling velocity recognized in the centrifugal settling test and the effect of the particle shape (D/T) on C at high Re region are considered to be able to affect the hydrocyclone classification. The misplacement of coarse plate-like particles in the hydrocyclone and cyclosizer tests could be ascribed to the particle shape effects. (C) 2012 Elsevier B.V. All rights reserved.
• Effect of water addition on centrifugal treatment to remove lead compounds from polyvinylchloride in electric wires and cables

  Masami Tsunekawa, Mayumi Ito, Yoshiaki Nakamura, Yuta Sasaki, Tomoo Sakai, Naoki Hiroyoshi

  SEPARATION AND PURIFICATION TECHNOLOGY 89 94 - 97 1383-5866 2012/03 [Refereed][Not invited]
   

  Recycling treatment of cable insulation resin generated from electric wires and cables was investigated. Here, PVC is the most common insulation resin and conventional insulation PVC contains a lead component, tribase, as a thermal stabilizer. To recycle this PVC as insulation resin, lead removal is necessary to be able to conform to RoHS. This paper proposes a solvent dissolution and centrifugation method and the effects of flocculants and water addition in the processes involved are described. (C) 2012 Elsevier B.V. All rights reserved.
• SUPPRESSION OF PYRITE OXIDATION BY CARRIER MICROENCAPSULATION USING SILICON AND CATECHOL

  Rani Kumari Thakur Jha, Jacqueline Satur, Naoki Hiroyoshi, Mayumi Ito, Masami Tsunekawa

  MINERAL PROCESSING AND EXTRACTIVE METALLURGY REVIEW 33 (2) 89 - 98 0882-7508 2012 [Refereed][Not invited]
   

  Acid mine drainage (AMD) is formed from the natural oxidation of sulfide minerals such as pyrite and FeS2. Prevention of AMD is very important and several techniques are currently being investigated for the treatment and abatement of AMD. This paper proposes carrier-microencapsulation (CME) using Si-catechol complex -Si(cat)(3)(2-) -for preventing pyrite oxidation. In CME, the water soluble organic carrier, catechol, and metal ion, Si, make a complex, e.g., tris-catecholato complex of Si4+, which oxidatively decomposes on pyrite surface and forms a stable oxide or hydroxide, e.g., Si(OH)(4) or SiO2 layer on the pyrite surface as a protective coating against pyrite oxidation. To demonstrate the effect of CME using Si(cat)(3)(2-) on pyrite oxidation, shaking flask leaching experiments of pyrite without and with CME treatment were performed. Significant halt in pH drop was observed after the CME treatment of pyrite. The CME coating was found very effective even at low Si(cat)(3)(2-) concentration of 1 and 5 mol m(-3). The amount of Fe and S leached were lower from the pyrite with CME treatment than without CME treatment, indicating that CME using Si and catechol is effective in suppressing pyrite oxidation. The effect of pH and presence of microorganism were also evaluated. The CME coating was found very effective even in acidic pH range. The CME treatment suppressed pyrite oxidation even in the presence of iron oxidizing microorganism. Presence of Si and O on the residue pyrite surface in energy-dispersive X-ray spectroscopy analysis supported the sustainability of CME coating at acidic pH.
• Jig separation of crushed automobile shredded residue and its evaluation by float and sink analysis

  Yutaka Kuwayama, Mayumi Ito, Noki Hiroyoshi, Masami Tsunekawa

  JOURNAL OF MATERIAL CYCLES AND WASTE MANAGEMENT 13 (3) 240 - 246 1438-4957 2011/10 [Refereed][Not invited]
   

  Automobile shredded residue is a potential solid fuel when its metal and chloride-containing components have been removed. The authors have investigated physical separation of automobile shredded residue to isolate components that may be used as solid fuel and reported that agglomerates of entangling fiber-like material are formed during crushing. These agglomerates make removal of metals and chloride-containing components difficult, and the paper proposes a treatment flowchart consisting of separate treatments of the coarse size fraction containing entangling fiber-like components and the smaller size fraction containing particulate matter. This paper reports the treatment of the smaller size fraction treated with jigging to obtain a low-ash and low-chloride-content product. A new washability curve was developed based on float and sink analysis test results, and it was applied to estimate the gravity separation performance of treatments such as jigging and dense medium separation. The estimated results show good agreement with the experimental results of jig separation.
• Evaluation of entanglement properties of crushed automobile shredded residue and detachment of entrapped particles

  Yutaka Kuwayama, Mayumi Ito, Maiko Akatsuka, Naoki Hiroyoshi, Masami Tsunekawa

  JOURNAL OF MATERIAL CYCLES AND WASTE MANAGEMENT 13 (2) 156 - 163 1438-4957 2011/08 [Refereed][Not invited]
   

  Automobile shredded residue is a potential solid fuel when its metal and chlorine-containing parts have been removed. The authors have investigated physical separation of automobile shredded residue to obtain the components that may be used in solid fuel and found that agglomerates of entangling fiber-like components are formed during crushing, making removal of metals and chlorine-containing parts difficult. In this paper, a reattachment ratio, entrapment ratio, and disentanglement ratio are proposed to evaluate the entanglement properties of crushed automobile shredded residue. It is found that products smaller than 16 mm were not reattached easily in the sieving process, and an index based on entanglement properties proposed here is useful to predict suitable crushing conditions. Wet detachment of entrapped particles from agglomerates of entangling materials was also applied to separate particulate matter from crushed ASR.
• Removal of lead compounds from polyvinylchloride in electric wires and cables using cation-exchange resin

  Masami Tsunekawa, Mayumi Ito, Yuta Sasaki, Tomoo Sakai, Naoki Hiroyoshi

  JOURNAL OF HAZARDOUS MATERIALS 191 (1-3) 388 - 392 0304-3894 2011/07 [Refereed][Not invited]
   

  Recycling treatment of cable insulation resin generated from electric wires and cables was investigated. Conventional insulation PVC contains a lead component, tribase, as a thermal stabilizer and lead removal is necessary to recycle this PVC as insulation resin. This paper describes a solid surface adsorption method using ion exchange resin to remove the fine lead containing particles from PVC dissolved solution. Low lead concentration in the recovered PVC, complying with the requirements of RoHS, was achieved. (C) 2011 Elsevier B.V. All rights reserved.
• Removal of lead compounds from polyvinylchloride in electric wires and cables using cation-exchange resin

  Masami Tsunekawa, Mayumi Ito, Yuta Sasaki, Tomoo Sakai, Naoki Hiroyoshi

  JOURNAL OF HAZARDOUS MATERIALS 191 (1-3) 388 - 392 0304-3894 2011/07 [Refereed][Not invited]
   

  Recycling treatment of cable insulation resin generated from electric wires and cables was investigated. Conventional insulation PVC contains a lead component, tribase, as a thermal stabilizer and lead removal is necessary to recycle this PVC as insulation resin. This paper describes a solid surface adsorption method using ion exchange resin to remove the fine lead containing particles from PVC dissolved solution. Low lead concentration in the recovered PVC, complying with the requirements of RoHS, was achieved. (C) 2011 Elsevier B.V. All rights reserved.
• Suppression of floatability of pyrite in coal processing by carrier microencapsulation

  Rani Kumari Thakur Jha, Jacqueline Satur, Naoki Hiroyoshi, Mayumi Ito, Masami Tsunekawa

  FUEL PROCESSING TECHNOLOGY 92 (5) 1032 - 1036 0378-3820 2011/05 [Refereed][Not invited]
   

  Carrier microencapsulation, CME. is a technique to form a thin layer of metal oxide or hydroxide on pyrite surface using a water soluble organic carrier combined with metal ions. The present study investigated the effect of CME using a tris-catecholato complex of Si(4+), Si(cat)(3)(2-) on pyrite-coal separation by dynamic bubble pick-up experiments and Hallimond tube flotation experiments using coal, pyrite. and a coal-pyrite mixture. The mineral samples were treated in 0-5 mol m(-3) Si(cat)(3)(2-) solutions at pH 4-9 at treatment times of 1-24 h. Dynamic bubble pick-up experiments showed that CME treatment converted the pyrite surface from hydrophobic to hydrophilic but did not affect coal's hydrophobic surface. The results of the Hallimond tube flotation experiments of a coal-pyrite mixture at pH 7-9 in the presence of kerosene as a collector showed that pyrite floatability was selectively suppressed after 1 h CME treatment with 0.5 mol (3) Si(cat)(3)(2-) while both coal and pyrite were floated without the treatment. Thus indicates that CME treatment is effective in suppressing pyrite floatability in coal-pyrite flotation. (C) 2011 Elsevier B.V. All rights reserved.
• Estimating the size distribution of anode and cathode activating agents in the crushed products of nickel metal hydride batteries from hybrid vehicles and its classification

  Mayumi Ito, Kouki Kashiwaya, Naohiro Sumiya, Hisatoshi Furuya, Naoki Hiroyoshi, Masami Tsunekawa

  INTERNATIONAL JOURNAL OF MINERAL PROCESSING 97 (1-4) 92 - 95 0301-7516 2010/11 [Refereed][Not invited]
   

  Nickel metal hydride batteries of hybrid vehicles contain Co and rare earth elements in the anode and cathode activating agents as well as in the main electrode component, Ni. The cathode electrodes comprise a porous Ni plate (cathode substrate) with nickel hydroxide as the cathode activating agent and the anode electrodes consist of a hydrogen storage alloy powder as the anode activating agent on a metal mesh substrate. A direct smelting method has been used to recover Ni from waste batteries, but the Co and rare earth elements are difficult to extract by this conventional method. To recycle Co and rare earth elements, physical pretreatment is necessary to separate the anode and cathode compounds before smelting. This study investigated the separation of anode and cathode activating agents in the <0.075 mm fraction of crushed nickel metal hydride batteries using a cyclone and the anode activating agent was concentrated in the underflow product. After crushing the waste batteries a mixture of cathode and anode activating agents is recovered as fines, and a simple and fast size distribution measurement method for each activating agent is desirable to evaluate the physical separation results and improve the separation efficiency. The results show that further size classification of the <0.075 mm fraction is effective to concentrate the anode activating agent for cylindrical type batteries. (C) 2010 Elsevier B.V. All rights reserved.
• Reverse jig separation of shredded floating plastics separation of polypropylene and high density polyethylene

  Mayumi Ito, Masami Tsunekawa, Emi Ishida, Koki Kawai, Tatsuru Takahashi, Naka Abe, Naoki Hiroyoshi

  INTERNATIONAL JOURNAL OF MINERAL PROCESSING 97 (1-4) 96 - 99 0301-7516 2010/11 [Refereed][Not invited]
   

  A desktop type batch reverse jig and prototype bench scale continuous reverse jig were designed by installing a top screen to the chamber of the RETAC jig. Shredded plastics of polypropylene (specific density 0.91) and high density polyethylene (specific density 0.96) were used for the tests and operating conditions were investigated using a desktop type batch jig. Waveform and screen design affected the separation results. Wettability control of feed sample is also important and 100% separation was achieved for the top and bottom layer products. The prototype bench scale continuous jig could obtain a high grade product, 99% pure as a bottom product. (C) 2010 Elsevier B.V. All rights reserved.
• Effect of chloride ions on leaching rate of chalcopyrite

  Kyoungkeun Yoo, Soo-kyung Kim, Jae-chun Lee, Mayumi Ito, Masami Tsunekawa, Naoki Hiroyoshi

  MINERALS ENGINEERING 23 (6) 471 - 477 0892-6875 2010/05 [Refereed][Not invited]
   

  The effect of chloride on chalcopyrite leaching has been investigated by performing batch leaching tests with three kinds of leaching solutions and using Hiroyoshi's model, which suggests that a zone of rapid leaching exists between the critical potential (E(c), equilibrium redox potential for the reduction of CuFeS(2) to Cu(2)S) and the oxidation potential (E(ox),, equilibrium redox potential for the oxidation of Cu(2)S). The results of the leaching tests show that the leaching rate in hydrochloric acid solution is the fastest and that the relationship between the Cu leaching rate and oxidation-reduction potential (ORP) follows Hiroyoshi's model. Thermodynamic calculations indicate that, with an increase in the chloride concentration, the concentration of cuprous ions increases as the chlorocuprate(I) complex ions are formed and the contribution of cuprous ions to the critical potential is greater than that of cupric ions, even though the concentration of cuprous ions is lower than that of cupric ions. This fact suggests that the formation of chlorocuprate(I) ions in a chloride solution may improve the chalcopyrite leaching rate by increasing the critical potential. (C) 2009 Elsevier Ltd. All rights reserved.
• On the Use of Magnetite for Gold Recovery From Chloride Solution

  Richard Diaz Alorro, Naoki Hiroyoshi, Hajime Kijitani, Mayumi Ito, Masami Tsunekawa

  MINERAL PROCESSING AND EXTRACTIVE METALLURGY REVIEW 31 (4) 201 - 213 0882-7508 2010 [Refereed][Not invited]
   

  The sorption of gold chloride ([image omitted]) from chloride solution on synthetic and natural magnetite powders was investigated by batch sorption experiments. The effects of different parameters on the recovery were studied. The results showed that Gold (Au) uptake by magnetite was influenced by pH, contact time, chloride concentration, and initial Au concentration. Gold uptake by synthetic and natural magnetite was maximum at pH 6-7 with sorption amounts of 4.4mol/g and 5.0mol/g, respectively, after 24hr at an initial Au concentration of 0.05mol/m3. The Scanning Electron Microscopy-Energy Dispersive X-ray and Back Scattering Electron analyses of the magnetite particles after treatment confirmed the presence of Au precipitates on the magnetite (Fe3O4) surface.
• Development of a New Gravity Separator for Plastics -a Hybrid-Jig

  Kunihiro Hori, Masami Tsunekawa, Masatsune Ueda, Naoki Hiroyoshi, Mayumi Ito, Hideaki Okada

  MATERIALS TRANSACTIONS 50 (12) 2844 - 2847 1345-9678 2009/12 [Refereed][Not invited]
   

  The development of mechanical methods for plastic-plastic separation is important for recycling of scrapped plastics of office/home appliances and cars. This paper proposes a Hybrid-Jig as it new method for plastic-plastic separation. The Hybrid-Jig was developed based on jigging and flotation, where air bubbles are introduced into the particle bed during jigging to modify the apparent specific gravity of the particles by the attachment of air bubbles to the particles so that particles having different surface properties can be separated by jigging even if their specific gravities are similar. To demonstrate the performance of the Hybrid-Jig, a laboratory scale TACUB jig was modified to induce air bubbles through the screen under the particle bed. and separation experiments of plastic particle mixtures were carried out tinder various displacements and frequencies of water pulsation. Feed samples were particle mixtures of two plastics chosen from eight kinds of plastics (3 of polyvinyl chloride (PVC), 4 of polyethylene (PE), and 1 of polyethylene terephthalate (PET)). The particles were cylindrical of 2-3 mm length and diameter, and their specific gravities were 1.05-1.55. In normal jig operation (without air bubbles), plastic particles with similar specific gravities were difficult to separate, but they were easily separated by the Hybrid-Jig, when air bubbles adsorbed on the surface of the more hydrophobic plastics, and the plastic particles with air bubbles were recovered as top product due to the decrease in apparent specific gravity, Because the differences in the hydrophobicity of the plastics cause the selective bubble attachment, high grade plastic products over 99.9 mass% were recovered by the Hybrid-Jig even for plastic mixtures having the same specific gravity. [doi:10.2320/matertrans.M-M2009825]
• Anode activating agent recovery by magnetic separation from the < 0.075 mm fraction of crushed nickel metal hydride batteries from hybrid vehicles

  Mayumi Ito, Kouki Kashiwaya, Naohiro Sumiya, Naoki Hiroyoshi, Masami Tsunekawa

  SEPARATION AND PURIFICATION TECHNOLOGY 69 (2) 149 - 152 1383-5866 2009/09 [Refereed][Not invited]
   

  Nickel metal hydride batteries of hybrid vehicles contain rare metals such as Ni, Co, and rare-earth elements as electrode components. A direct smelting method has been used to recover Ni from waste batteries, but the Co and rare-earth elements are difficult to extract with this conventional method. To recycle Co and rare-earth elements, physical pretreatment is necessary to separate the anode and cathode compounds before smelting. This study investigated the magnetic separation of anode and cathode activating agents in the <0.075 mm fraction of crushed cylindrical and prismatic types batteries. In the cylindrical type anode activating agent concentrated in the non-magnetic product of the Davis tube tester, separated at low magnetic fields (0.1 T), while in the prismatic type anode activating agent concentrated in the magnetic product of high gradient magnetic separation. Microscope observations and results of the elemental analysis with energy dispersive X-ray spectroscopy showed that this separation behavior difference originates from differences in the cathode component manufacturing processes. An optimum physical treatment process using magnetic separation is proposed to recover the rare metal components. (C) 2009 Elsevier B.V. All rights reserved.
• Optimum water pulsation of jig separation for crushed plastic particles

  Kunihiro Hori, Masami Tsunekawa, Naoki Hiroyoshi, Mayumi Ito

  INTERNATIONAL JOURNAL OF MINERAL PROCESSING 92 (3-4) 103 - 108 0301-7516 2009/08 [Refereed][Not invited]
   

  Mechanical separation of different plastics should be established in planning and constructing a recycling plant for scrapped office and home appliances. The authors studied jig separation of small plastic particles (two types of burn-resistant polyethylene (PE) and polyvinyl chloride (PVC)) using a TACUB jig. The size of the particles was 0.5-3 mm and the specific gravities of the two PEs and PVC were about 1.1, 1.3 and 1.4, respectively. The jig separation experiments were carried out under various water pulsations, at which the amplitude, frequency, and pattern of pulsation were varied. Based on the observation of separation progress and water pulsation, it was found that the upstream velocity of the pulsation is a very important factor to form high grade PE and PVC product layers with high efficiency. Moderate fluidization of particle bed caused high separation performance. High-grade PE and PVC products over 99.8% were recovered under pulsations of small frequency and amplitude. The optimum separation condition was determined easily by measuring the fluidity of the plastic beds in the separation chamber. (C) 2009 Published by Elsevier B.V.
• Experimental study of coal liberation: Electrical disintegration versus roll-crusher comminution

  M. Ito, S. Owada, T. Nishimura, T. Ota

  INTERNATIONAL JOURNAL OF MINERAL PROCESSING 92 (1-2) 7 - 14 0301-7516 2009/07 [Refereed][Not invited]
   

  Preferential breakage, where the boundary of mineral particles and coal substances are selectively broken up, is an effective comminution method for poor liberation coals such as middling coal subjected to jig treatment. A comparison of electrical disintegration (ED) product and roll crusher product of Nantun (China) clean coal was carried out in this study. Coal particles of 4 to 8 mm diameter with specific gravities of 1.35 to 1.45 were used as the feed and the crushed product was classified into 12 fractions by size and specific gravity and analyzed for ash and mineral content using a norm calculation method. The generation ratios of light clean coal and heavy waste fractions in the ED product were higher than in the roll crusher product and this indicates that ED improved the mineral liberation. The microscopic observations supported this. The norm calculation results showed that calcite, dolomite, and pyrite were concentrated in the heavy and fine fractions, a behavior that is different from that of kaolinite. (C) 2009 Elsevier B.V. All rights reserved.
• Recovery of heavy metals from MSW molten fly ash by CIP method

  Richard Diaz Alorro, Naoki Hiroyoshi, Mayumi Ito, Masami Tsunekawa

  HYDROMETALLURGY 97 (1-2) 8 - 14 0304-386X 2009/06 [Refereed][Not invited]
   

  Molten fly ash (MFA), generated by the melting process of municipal solid waste incineration (MSWI) solid residues in Japan, contains considerable amounts of heavy metals such as Pb, Zn, Cu and Cd. Therefore, MFA is classified as a hazardous waste and needs treatment for detoxification or recovery of heavy metals as secondary sources. Carrier-in-Pulp (CIP) method, which is similar in principle with the Carbon-in-Pulp technology for gold recovery from ores, was proposed to recover these heavy metals from molten fly ash. Unlike the traditional Carbon-in-Pulp process, the carrier or adsorbent in the Carrier-in-Pulp method is not only limited to carbon; other materials such as Fe powder can also be used. Moreover, other physical separation techniques such as magnetic separation can also be employed to harvest the carrier from the leach pulp. The present study, which can be regarded as a batch mode Carbon-in-Pulp process, investigated the application of the CIP technique to recover heavy metals from MSW molten fly ash containing 10.2 wt.% Zn, 2.78 wt.% Pb, 0.14 wt.% Cu, and 0.12 wt.% Cd. Granular activated carbon (GAC) was utilized as an adsorbent in batch adsorption tests and experiments involving the CIP method using NaCl as lixiviant. The effects of activated carbon dosage, pH, NaCl concentration, and treatment time were determined. Adsorption tests showed that the competition of metal ions present in a multi-component system suppressed the adsorption of Pb, Zn, Cu and Cd on GAC but the suppression can be minimized by increasing the GAC dosage. Around 90-100% of Pb, Zn, Cu and Cd were extracted from MFA at various conditions. At the optimum conditions (5 kmol m(-3) NaCl, 10 g GAC, pH 5-6, and 3 h treatment time), GAC recovered 57% Zn, 40% Pb, 90% Cu, and 54% Cd. The leaching test confirmed that the extraction of Pb from the CIP-treated residue was below the standard. thus, satisfying the land-filling guidelines in Japan. (C) 2008 Elsevier B.V. All rights reserved.
• Removal of Trace Impurity from Limestone Using Flotation Techniques

  Masami Tsunekawa, Yugo Honma, Kyoungkeun Yoo, Naoki Hiroyoshi, Mayumi Ito

  MATERIALS TRANSACTIONS 50 (1) 171 - 176 1345-9678 2009/01 [Refereed][Not invited]
   

  High grade limestone was obtained by removing trace impurities through reverse and carrier flotation techniques. A simple method for measuring the impurity content of limestone was developed by correlating the amount of impurities and the turbidity of suspensions of residue from limestone dissolved in 20% acetic acid. Impurity removal more than 50% with limestone recovery better than 85% was obtained under suitable conditions by both reverse flotation and carrier flotation using sodium oleate (NaOl) and dodecylammonium acetate (DAA) as collectors. Limestone containing more than 0.15 mass% impurity was used as the carrier. These results suggest that limestone treated by flotation can be used as high quality limestone in paper manufacturing. [doi:10.2320/matertrans.M-MRA2008839]
• Recent Developments in Advanced Coal Cleaning

  ITO Mayumi

  Journal of MMIJ 社団法人 資源・素材学会 124 (12) 865 - 870 1881-6118 2008/12/25 [Not refereed][Not invited]
   

  The rise in demand for coal due to growth in Asia is inducing coal price increases and it will be necessary to develop cleaning method for difficult-to-treat coal. High-efficiency power generation techniques are required to reduce greenhouse gas emissions and it is necessary to reduce ash content of coal significantly before combustion. Advanced coal cleaning techniques can generate low ash coals and this paper reviews recent applications of low ash coal, recent developments in commercial scale and lab scale flotation, and research results of enhanced gravity separators and comminution.
• Recovery of heavy metals from MSW molten fly ash by carrier-in-pulp method: Fe powder as carrier

  Richard Diaz Alorro, Shinichi Mitani, Naoki Hiroyoshi, Mayumi Ito, Masami Tsunekawa

  MINERALS ENGINEERING 21 (15) 1094 - 1101 0892-6875 2008/12 [Refereed][Not invited]
   

  Municipal solid waste (MSW) molten fly ash is classified as a hazardous waste because it contains considerable amount of heavy metals, which pose environmental concern due to their leaching potential in landfill environment. This study proposes carrier-in-pulp (CIP) method as a new hydrometallurgical route to extract and recover Pb, Zn, Cu, and Cd from molten fly ash before landfilling. In this method, a carrier material, which recovers the extracted metals, is added simultaneously with fly ash to a leaching solution and is harvested from the pulp by physical separation method, such as magnetic separation or sieving. To demonstrate the effect of the CIP method, shaking flask experiments were conducted under various conditions using NaCl solution, iron powder as carrier, and molten fly ash. More than 99 wt% Pb, Zn, and Cd, and 97 wt% Cu were extracted from the ash. However, only Pb and Cu were recovered (96.3 wt% Pb and 94.3 wt% Cu) by the iron powder through cementation, leaving behind Zn and Cd ions in the solution phase. The leaching test conducted on the treated fly ash residue revealed that the CIP method suppressed the solubilization of Pb to a value below the landfill disposal guideline. (C) 2008 Elsevier Ltd. All rights reserved.
• Carrier-microencapsulation using Si-catechol complex for suppressing pyrite floatability

  Rani Kumari Thakur Jha, Jacqueline Satur, Naoki Hiroyoshi, Mayumi Ito, Masami Tsunekawa

  MINERALS ENGINEERING 21 (12-14) 889 - 893 0892-6875 2008/11 [Refereed][Not invited]
   

  Pyrite (FeS2) is a common sulfide mineral associated with valuable metal minerals and coal, and it is rejected as a gangue mineral using physical separation techniques such as froth flotation and discharged into tailing pond. In the flotation, pyrite is frequently entrapped in the froth due to its hydrophobic nature. Formation of acid mine drainage due to the air-oxidation of pyrite in the tailing pond is also a serious problem. The authors have proposed carrier-microencapsulation (CME) as a method for suppressing both the floatability and oxidation of pyrite. In this method, pyrite is coated with a thin layer of metal oxide or hydroxide using catechol solution as a carrier combined with metal ions. The layer converts the pyrite surface from hydrophobic to hydrophilic and acts as a protective coating against oxidation. The present study demonstrates the effect of CME using Si-catechol complex to suppress the pyrite floatability: The bubble pick-up experiments showed that attachment of pyrite particles to air bubble is suppressed by the CME treatment at pH 4-10, Si-catechol complex concentration over 0.5 mol m(-3) and treatment time within 2 min. The Hallimond tube flotation experiments showed that the pyrite floatability is suppressed by the CME treatment even in the presence of typical flotation collectors such as kerosene and xanthate. SEM-EDX analysis confirmed that Si present on the pyrite surface treated by Sicatechol complex, implying that SiO2 or Si(OH4) layer formed by the CME treatment convert the pyrite surface hydrophobic to hydrophilic. (C) 2008 Elsevier Ltd. All rights reserved.
• Immersion Behavior of Automobile Shredded Residue in Surfactant Solutions and Detachment of Particulate Matter

  Mayurni Ito, Maiko Akatsuka, Yutaka Kuwayama, Kunihiro Hori, Naoki Hiroyoshi, Masami Tsunekawa

  MATERIALS TRANSACTIONS 49 (10) 2371 - 2376 1345-9678 2008/10 [Refereed][Not invited]
   

  This study investigated the effect of the addition of wetting agents on automobile shredded residue (ASR) wettability, and found that the surfactants diisooctyl sodium sulfosuccinate (AOT) and sodium dodecyl sulfate (SDS) were effective to improve immersion of the ASR, due to their ability to reduce the solution surface tension and the contact angle of ASR. Urethane foam is a bulky compound in ASR and its immersion and wetting behavior showed similar changes as those of the ASR samples. With SDS the surface wettability of urethane was improved. The surfactant solutions were also effective in the detachment of the entrapped particles from the agglomerate of entangling fiber like materials. The effects of the surfactant concentrations on ASR wettability and the amount of detached particles are described. [doi: 10.2320/matertrans.M-MRA2008824]
• Engineering Education for All University First Year Students Using Playing in the Sand and Blowing Soap Bubbles

  TSUNEKAWA Masami, HIROYOSHI Naoki, ITO Mayumi, HIRAJIMA Tsuyoshi

  Journal of JSEE 公益社団法人 日本工学教育協会 56 (5) 111 - 114 1341-2167 2008/09/20 [Not refereed][Not invited]
   

  Hokkaido University holds first year student seminars for promoting student ability in communication, presentation, design, and creativity. The authors have held this seminar to students of all faculties, where the research topics were determined by the students themselves from the phenomena or questions relating to children′s games such as playing in the sand and blowing soap bubbles. Then, they planned experimental procedures, discussed, summarized, and presented the results with minimal advice from teachers. After the student presentations the teachers introduced the techniques and equip...
• Dispersion-Flocculation Behavior of Fine Lead Particles in an Organic Solvent

  Masami Tsunekawa, Yuta Sasaki, Yoshiaki Nakamura, Mayumi Ito, Naoki Hiroyoshi, Kyoung Keun Yoo

  MATERIALS TRANSACTIONS 49 (9) 2119 - 2123 1345-9678 2008/09 [Refereed][Not invited]
   

  Methyl ethyl ketone (MEK) is a good solvent for polyvinyl chloride (PVC) and it has been proposed for use in PVC recycling. In the recycling process, fine particles of 3PbO.PbSO4.H2(O), used as a thermal stabilizer in PVC products, are dispersed and not dissolved in the solvent. To establish methods for removing of 3PbO.PbSO4.H2O particles from the solvent, factors affecting the dispersion-flocculation behavior of the particles in MEK were investigated. The zeta potential and particle distribution of 3PbO.PbSO4.H2O particles in MEK solutions containing known amounts of H2O were measured. Above 5 vol%H2O in MEK solutions, the zeta potential of 3PbO.PbSO4.H2O particles approached zero and the flocculation of particles was achieved. In addition, it was found that Pb2+ and Cl- affect the zeta potential of the particles. These results indicate that the dispersion-flocculation behavior of lead particles can be influenced by the concentration of H2O, Ph2+, and Cl- in MEK. [doi: 10.2320/matertrans.M-MRA2008822]
• Estimation of degree of liberation in a coarse crushed product of cobalt-rich ferromanganese crust/nodules and its gravity separation

  Mayumi Ito, Masami Tsunekawa, Eiji Yamaguchi, Kengo Sekimura, Kouki Kashiwaya, Kunihiro Hori, Naoki Hiroyoshi

  INTERNATIONAL JOURNAL OF MINERAL PROCESSING 87 (3-4) 100 - 105 0301-7516 2008/07 [Refereed][Not invited]
   

  Cobalt-rich ferromanganese crust and nodule ores from seamount areas contain volcanic and sedimentary rocks as substrate or nuclei. During mining operations, these rocks should be separated as unfavorable waste rocks with the ferromanganese minerals. The cobalt-rich ferromanganese crust and nodule ores require mineral processing to remove the substrate/nuclei rock before the smelting. Deep-sea manganese nodule ores in contrast contain vanishingly small rocks, and can be directly treated with a metallurgical process without mineral processing treatment. This study is a physical and chemical description of the ores for the purpose of mineral processing, and reports estimates of the degree of liberation in a coarse crushed product of ores and its gravity separation results. From the obtained results a process flow-sheet for the beneficiation of cobalt-rich ferromanganese crust and nodules is proposed. (c) 2008 Elsevier B.V. All rights reserved.
• Carrier-in-Pulp Method as a New Hydrometallurgical Route to Reject and Recover Heavy Metals from MSW Melting Fly Ash

  R. D. Alorro, S. Mitani, N. Hiroyoshi, M. Ito, M. Tsunekawa

  Proceedings of The 22nd International Conference on Solid Waste Technology and Management 270 - 276 2008 [Refereed][Not invited]
  
• Selective crushing of cobalt-rich ferromanganese ores and flotation of the fine size product

  M. Ito, K. Kashiwaya, E. Yamaguchi, K. Sekimura, T. Takahashi, N. Hiroyoshi, M. Tsunekawa

  Proceedings of The 2nd International Workshop and Conference on Earth Resources Technology 42 - 45 2008 [Refereed][Not invited]
  
• Optimization of Jig Separation with Fluidization of Particle Layer

  K. Hori, M. Tsunekawa, N. Hiroyoshi, M. Ito

  Proceedings of 24rd International Mineral Processing Congress 841 - 845 2008 [Refereed][Not invited]
  
• Rejection and recovery of heavy metals from MSW melting fly ash by carrier-in-pulp method

  R. D. Alorro, N. Hiroyoshi, S. Mitani, M. Ito

  Proceedings of 24rd International Mineral Processing Congress 3610 - 3617 2008 [Refereed][Not invited]
  
• Mineral processing of cobalt-rich ferromanganese crust and nodules

  M. Ito, M. Tsunekawa, K. Sekimura, E. Yamaguchi, K. Kashiwaya, K. Hori, N. Hiroyoshi

  Proceedings of 24rd International Mineral Processing Congress 806 - 812 2008 [Refereed][Not invited]
  
• Physical Separation of Crushed Product of Waste Nickel-Metal Hydride Batteries from Hybrid Vehicles

  M. Ito, M. Tsunekawa, K. Kashiwaya, N. Sumiya, H. Furuya, N. Hiroyoshi

  Proceedings of REWAS 2008 3 - 8 2008 [Refereed][Not invited]
  
• Carrier-microencapsulation for preventing pyrite oxidation

  Jacqueline Satur, Naoki Hiroyoshi, Masami Tsunekawa, Mayumi Ito, Hideyuki Okamoto

  INTERNATIONAL JOURNAL OF MINERAL PROCESSING 83 (3-4) 116 - 124 0301-7516 2007/09 [Refereed][Not invited]
   

  The oxidation of pyrite causes the formation of acid mine drainage polluted by heavy metals. This paper proposes carrier-microencapsulation (CME) for preventing pyrite oxidation. In CME, an organic agent is used as an in-situ carrier for transporting Ti from Ti minerals to the pyrite surface through an aqueous phase. Then, the organic carrier is decomposed and Ti(OH)(4) or TiO2 film is formed on the pyrite surface as a protective coating against oxidation. To demonstrate the effect of CME on pyrite oxidation, shaking-flask leaching experiments of ground pyrite were performed at 298 K in air for 25 days, with or without anatase (TiO2) and catechol (1,24hydroxybenzene) as the organic carrier. The amounts of Fe and S extracted from the pyrite were lower with TiO2 and catechol than without TiO2 or catechol, indicating that CME using TiO2 and catechol is effective in suppressing pyrite oxidation. When TiO2 and catechol coexist, the Ti concentration in the solution phase increased initially and then decreased. SEM-EDX analysis of the CME-treated pyrite showed that Ti and 0 are present on the pyrite surface. Cyclic voltammogram of catechol showed that catechol was oxidized on pyrite electrode. These results indicate that Ti is extracted from TiO2 by catechol as a Ti-catechol complex and that the complex is adsorbed and oxidized on pyrite to form a Ti (OH)(4) or TiO2 coating suppressing pyrite oxidation. (c) 2007 Elsevier B.V. All rights reserved.
• Carrier-microencapsulation for preventing pyrite oxidation

  Jacqueline Satur, Naoki Hiroyoshi, Masami Tsunekawa, Mayumi Ito, Hideyuki Okamoto

  INTERNATIONAL JOURNAL OF MINERAL PROCESSING 83 (3-4) 116 - 124 0301-7516 2007/09 [Refereed][Not invited]
   

  The oxidation of pyrite causes the formation of acid mine drainage polluted by heavy metals. This paper proposes carrier-microencapsulation (CME) for preventing pyrite oxidation. In CME, an organic agent is used as an in-situ carrier for transporting Ti from Ti minerals to the pyrite surface through an aqueous phase. Then, the organic carrier is decomposed and Ti(OH)(4) or TiO2 film is formed on the pyrite surface as a protective coating against oxidation. To demonstrate the effect of CME on pyrite oxidation, shaking-flask leaching experiments of ground pyrite were performed at 298 K in air for 25 days, with or without anatase (TiO2) and catechol (1,24hydroxybenzene) as the organic carrier. The amounts of Fe and S extracted from the pyrite were lower with TiO2 and catechol than without TiO2 or catechol, indicating that CME using TiO2 and catechol is effective in suppressing pyrite oxidation. When TiO2 and catechol coexist, the Ti concentration in the solution phase increased initially and then decreased. SEM-EDX analysis of the CME-treated pyrite showed that Ti and 0 are present on the pyrite surface. Cyclic voltammogram of catechol showed that catechol was oxidized on pyrite electrode. These results indicate that Ti is extracted from TiO2 by catechol as a Ti-catechol complex and that the complex is adsorbed and oxidized on pyrite to form a Ti (OH)(4) or TiO2 coating suppressing pyrite oxidation. (c) 2007 Elsevier B.V. All rights reserved.
• The recovery of electrode compounds from waste nickel metal hydride batteries by physical separation techniques

  Masami Tsunekawa, Mayumi Ito, Hisatoshi Furuya, Naoki Hiroyoshi

  MATERIALS TRANSACTIONS 48 (5) 1089 - 1094 1345-9678 2007/05 [Refereed][Not invited]
   

  A recovery method for electrode compounds from waste nickel metal hydride batteries by physical separation using sizing and distance-variable magnetic separation was investigated. The electrodes are formed by bonding substances of substrate and fine activating agents. Fine particle separation causes increasing costs and decreasing separation efficiency, suggesting a treatment flow where the separation of the anodic compounds from the cathodic compounds is carried out first and then each compound is crushed again for the liberation of activating agents and substrate. There is no suitable magnetic separation equipment to separate ferromagnetic substances using the magnetic property differences in the substrate components and special equipment to achieve this was developed. Using this newly developed equipment resulted in good separation.
• Carrier-Microencapsulation using Si-Catechol Complex for Suppressing Pyrite Floatability

  R .K .T. Jha, J. Satur, N. Hiroyoshi, M. Ito, M. Tsunekawa

  Proceedings of MEI's Intern. Flotation '07 Conf 1 - 14 2007 [Refereed][Not invited]
  
• Development of Wet Recycling Process for Automobile Shredded Residue - Effect of Surfactants on the Wettability of Autmobile Shredded Residue

  M. Ito, M. Akatsuka, Y. Kuwayama, K. Hori, N.Hiroyoshi, M. Tsunekawa

  Proceedings of 9th Int. Symp. East Asian Recycling Technology 237  2007 [Refereed][Not invited]
  
• Dispersion-Floccuration Behavior of Fine Pb Powder in Organic Solvent

  M. Tsunekawa, Y. Sasaki, Y. Nakamura, M. Ito, N. Hiroyoshi, K. K. Yoo

  Proceedings of 9th Int. Symp. East Asian Recycling Technology 503  2007 [Refereed][Not invited]
  
• Physical Separation of Anode and Cathod Activating Agents from Waste Nickel Metal Hydride Batteries

  M. Ito, K. Kashiwaya, N. Sumiya, H. Furuya, N.Hiroyoshi, M. Tsunekawa

  Proceedings of 9th Int. Symp. East Asian Recycling Technology 439  2007 [Refereed][Not invited]
  
• Classification of Fine Hydrophobic Particles Using Hydrocyclone

  K. Kashiwaya, T. Noumachi, M. Ito, N.Hiroyoshi, M. Tsunekawa

  Proceedings of 9th Int. Symp. East Asian Recycling Technology 503  2007 [Refereed][Not invited]
  
• New Washing Method of Lead Contaminated Soil

  M. Ito, N. Hokari, M. Takada, N.Hiroyoshi, M. Tsunekawa

  Proceedings of 9th Int. Symp. East Asian Recycling Technology 576  2007 [Refereed][Not invited]
  
• Development of a New Gravity Concentration Machinery - a Hybrid Jig

  K. Hori, M. Tsunekawa, N.Hiroyoshi, M. Ito

  Proceedings of 9th Int. Symp. East Asian Recycling Technology 466  2007 [Refereed][Not invited]
  
• Development of Wet Recycling Process for Automobile Shredded Residue - Evaluation of Entanglement Properties of Automobile Shredded Residue Crushed Product

  M. Ito, Y. Kuwayama, M. Akatsuka, K. Hori, N.Hiroyoshi, M. Tsunekawa

  Proceedings of 9th Int. Symp. East Asian Recycling Technology 187  2007 [Refereed][Not invited]
  
• Mineral Processing of Cobalt-Rich Manganese Crust and Nodules - Establishment of treatment flow for removal of substrate rock from deep sea mined ore

  M. Ito, K. Kashiwaya, E. Yamaguchi, K. Sekimura, K. Hori, N. Hiroyoshi, M. Tsunekawa

  Proceedings of 37th Underwater Mining Institute 2007 [Refereed][Not invited]
  
• Carrier-Microencapsulation for Suppressing Flotability and Oxidation of Pyrite in Copper Mineral Processing

  J. Satur, N. Hiroyoshi, M. Ito, M. Tsune

  Proceedings of the 6th International Copper-Cobre Conference 3 - 9 2007 [Refereed][Not invited]
  
• Recent Developments in plastic-plastic separation techniques

  ITO Mayumi, TSUNEKAWA Masami

  Shigen-to-Sozai 社団法人 資源・素材学会 122 (4/5) 142 - 149 0916-1740 2006/05/25 [Not refereed][Not invited]
   

  As the earth has a finite amount of resources, resource-saving is important to maintain an affluent life. In Japan various types of Recycling Laws were implemented to promote a recycling-oriented society, and packaging materials, home appliance, automobile and personal computer are collected and treated for recycling. Waste plastics are utilized for substitute for blast furnace coke or fuel and also they are recycled as plastic materials. Developing advanced separation techniques which can treat the waste plastics at low cost and get high grade plastics are required to recycle the plastics ...
• Microscopic Analysis of Dynamic Loading-induced Fractures by Using Micro CT

  Yokota M, Ito M, Kaneko K, Cho S.H, Owada S

  Proceedings of Advances in X-ray Tomography for Geomaterials 237 - 243 2006 [Refereed][Not invited]
  
• The Effects of Mineralogical Properties of Samples on Liberation Phenomena in Electrical Disintegration

  ITO M, Owada S, CHO S.H, Nishimura T, Nakagawa T, Nakamiya Y, Yokota M, Kaneko K

  Proceedings of 23rd International Mineral Processing Congress 247 - 252 2006 [Refereed][Not invited]
  
• Comparison of Several Liberation Models Considering Preferential Breakage at Phase Boundaries

  Owada S, Ohmiya T, Morikawa T, ItoM

  Proceedings of 23rd International Mineral Processing Congress 1800 - 1805 2006 [Refereed][Not invited]
  
• The recovery of electrode materials from waste nickel metal hydride batteries in a hybrid vehicle

  Tsunekawa M, Furuya H, Hiroyoshi N, Ito M, Kitamura O, Ichimura R, Kikuta K

  Proceedings of 3rd Japan-Korea International Symposium of Resources Recycling and Materials Science 59 - 73 2006 [Refereed][Not invited]
  
• Dynamic fragmentation of rock by high-voltage pulses

  Cho S.H, Mohanty B, Ito M, Nakamiya Y, Owada S, Kubota S, Ogata,Y, Shibayama A, Yokota M, Kaneko K

  Proceedings of 41st U.S. Symposium on Rock Mechanics 1118  2006 [Refereed][Not invited]
  
• Technological Developments in Wet Gravity Separation Processes

  TSUNEKAWA Masami, HORI Kunihiro, HIROYOSHI Naoki, ITO Mayumi

  Shigen-to-Sozai 社団法人 資源・素材学会 121 (10/11) 467 - 473 0916-1740 2005/11/25 [Not refereed][Not invited]
   

  Gravity separation is one of the ancient technologies for mineral processing and is still in widespread use. In recent years, many kinds of machinery for wet gravity separation have been developed and applied to process fine particles and solid waste.<BR>The authors have reviewed newly developed machineries, in addition to the principle of wet gravity separation and conventional machineries. Most of them are conducted in gravitational fields or films of flowing water. The former harnesses the settling behavior of particles in water and the later the movement of particles in films of flowi...
• Proposal and Experimental Validation of New Liberation Model Considering Preferential Breakage at Phase Boundaries

  OWADA Shuji, ITO Mayumi, NARAKI Ken, TAKEDA Kuniyoshi, KUROKAWA Kazushige, OHMIYA Takayuki

  Shigen-to-Sozai 社団法人 資源・素材学会 121 (1) 28 - 33 0916-1740 2005/01/25 [Not refereed][Not invited]
   

  This paper describes a new liberation model considering preferential breakage at phase boundaries to make a predicted degree of liberation to be feasible. This model is a modification of the Wiegel model, which is one of the most popular and widely acceptable models, introducing an index of "Preferential Breakage Probability, e" at phase boundaries. Concept, structure, simulation results, and validation of the model were shown in this paper, including the results of applicability for various kinds of natural and synthetic composite materials. This index of "Preferential Breakage Probabili...
• Approaches for Reducing Wasted "Red Mud"--Possibility of Upgrading Bauxite and the "Red Mud

  Owada S, Okajima D, Nakamura Y, Ito M, Owada

  Proceedings of 7th International Alumina Quality Workshop 205 - 209 2005 [Refereed][Not invited]
  
• Reduction of the amount of wasted "red mad" by syrface grinding for bauxite and by magnetic separation for the "red mud" itself

  Owada S, Okajima D, Nakamura Y, Ito M

  Proceedings of 3rd Japan-Korea International Symposium of Resources Recycling and Materials Science 34 - 39 2005 [Refereed][Not invited]
  
• Upgrading of crystalline limestone by carrier flotation

  M Tsunekawa, Y Honma, K Yoo, N Hiroyoshi, M Ito

  Proceedings of the 8th International Symposium on East Asian Resources Recycling Technology-2005 221 - 224 2005 [Refereed][Not invited]
   

  High grade limestone was obtained by removing trace impurities through flotation techniques such as reverse flotation and carrier flotation. Impurity removal of more than 50 % with limestone recovery higher than 85% was obtained under suitable conditions by both reverse flotation and carrier flotation using sodium oleate (NaOl) and dodecyl ammonium acetate (DAA) as collectors. Limestone of 0.15 w/w % impurity was used as a carrier. These results indicate that the limestone treated by flotation can be used as a high quality limestone in paper manufacturing.
• The recovery of useful materials from scrapped secondary batteries by physical separation techniques

  A Tsunekawa, H Furuya, N Hiroyoshi, A Ito, O Kitamura, R Ichimura, K Kikuta

  Proceedings of the 8th International Symposium on East Asian Resources Recycling Technology-2005 382 - 385 2005 [Refereed][Not invited]
   

  For effective reuse and recycling of valuable materials contained in Nickel/metal hydride batteries, physical separation of a cathode electrode from an anode hydrogen adsorption material is essential as a preliminary step to a hydrometallurgical recycling process. In this study, selective crushing at low temperature and magnetic separation were applied for bookshelf type NiMH batteries and an optimum treatment flow with 3-stage magnetic separation process was proposed and demonstrated.
• The Role of Mineral Processing Technology in a Society Based on Recycling

  Masami Tsunekawa, Kyoungkeun Yoo, Naoki Hiroyoshi, Mayumi Ito

  Resources Processing 52 (1) 32 - 38 1349-9262 2005 [Not refereed][Not invited]
   

  Industrial systems and daily life in Japan are shifting to a society based on recycling to reduce energy and resource consumption. To establish a society based on recycling urban resource recovery centers (mines) are important as places to reduce waste volumes, reusing and recycling valuable materials with application of mineral processing technology. The authors have reviewed applications of mineral processing in urban mines, and recent developments in common separation methods, magnetic separation, gravity separation, flotation, and agglomeration in liquid. © 2005, The Resources Processing Society of Japan. All rights reserved.
• Creating new liberation model considering preferential breakage at phase boundaries for material recycling

  Owada, S, Ohmiya, T, Oda, R, Ito, M

  Proceedings of Global Symposium on Recycling, Waste Treatment and Clean Technology 829 - 842 2004 [Refereed][Not invited]
  
• 静電選別の原理とリサイクリングへの応用 (特集 資源処理と廃棄物処理に貢献する固体ハンドリング技術)

  伊藤 真由美, 大和田 秀二

  粉体と工業 粉体と工業社 35 (5) 40 - 52 0287-6280 2003/05 [Not refereed][Not invited]
  
• 資源処理と廃棄物処理に貢献する固体ハンドリング技術 静電選別の原理とリサイクリングへの応用

  伊藤真由美, 大和田秀二

  粉体と工業 粉体と工業社 35 (5) 40 - 52 0287-6280 2003/05/01 [Not refereed][Not invited]
  
• APPLICATION OF ELECTRICAL DISINTEGRATION TO COAL

  Shuji Owada, Mayumi Ito, Tomoe Ota, Takehiko Nishimura, Takashi Ando, Toru Yamashita, Sadayuki Shinozaki

  Proceeding of XXII International Mineral Processing Congress 623 - 631 2003 [Refereed][Not invited]
  
• Dry Cleaning of Small Size Coal Using Bench Scale Air-Table Separator

  Toru Yamashita, Mayumi ITO, Kazuyoshi Yamaguchi

  Proceedings of First International Symposium on Dry Coal Cleaning, Clean Coal Technology 90 - 98 2002 [Refereed][Not invited]
  
• Iron Dissolution Behavior from High Sulfur Refuse and Flotation of High Sulfur Coal in the Leachate of the Refuse

  ITO Mayumi, TSUNEKAWA Masami, HIRAJIMA Tsuyoshi, HIROYOSHI Naoki, YAMADA Ryuichi, YUKAWA Kentaro

  Shigen-to-Sozai 社団法人 資源・素材学会 117 (12) 961 - 966 0916-1740 2001/12/25 [Not refereed][Not invited]
   

  The effects of inhibitors to iron-oxidizing bacteria (Thiobacillus ferrooxidans) on the dissolution of iron species from high sulfur coal refuse (5.75 db% S) were studied in acidic solutions with the bacteria, using sodium lauryl sulfate (SDS) and tannic acid as inhibitors. Flotation experiments of high sulfur coal (4.27 dafb% S) in leachates from the refuse were conducted to remove sulfur.<BR>Compared with tannic acid, SDS inhibited the iron-oxidizing activity of Thiobacillus ferrooxidans more and dissolution of pyrite in high sulfur coal refuse, but SDS did not prevent dissolution of solu...
• Basic Study on Separation of Pyrite from Coal by Flotation Using Ferric Solution

  ITO Mayumi, TSUNEKAWA Masami, HIRAJIMA Tsuyoshi, HIROYOSHI Naoki, YUKAWA Kentaro

  Shigen-to-Sozai 社団法人 資源・素材学会 115 (10) 737 - 742 0916-1740 1999/10/25 [Not refereed][Not invited]
   

  Flotation behavior of coal and pyrite was investigated by bubble pick-up tests and Hallimond tube flotation. Flotation recovery of coal and pyrite was high in the acidic region and decreased with increasing pH. In solutions containing iron species the recovery of pyrite decreased drastically at pHs where iron hydroxide was precipitated, but coal flotation was not influenced. Zeta potentials of pyrite and iron hydroxide precipitates were measured under various conditions and the formed precipitates were characterized by XRD, FTIR, and settling velocity measurements. The precipitates formed a...
• A Method to Characterize Flotation Performance of Fine Coal and Estimate its Liberation

  TSUNEKAWA Masami, KON Yukitada, ITO Mayumi, HIRAJIMA Tsuyoshi, HIROYOSHI Naoki

  Shigen-to-Sozai 社団法人 資源・素材学会 114 (6) 421 - 425 0916-1740 1998/06/25 [Not refereed][Not invited]
   

  The authors have developed a new method to evaluate coal flotation behavior. The liberation degree of mineral matter in feed and the ultimate ash content of froth product can be estimated using this method. Modified release analysis and oil agglomeration tests were carried out using different feed size of coal. The results were plotted on combustible recovery vs. ash content of clean coal curves and on combustible (or mineral matter) recovery vs. yield curves. Graphic analysis of these curves is proposed to give the ultimate ash content of coal concentrate obtained under ideal conditions an...
• A New Method to Characterize Flotation Performance of Fine Coal

  Tsunekawa M, Kon Y, Hirajima T, Ito

  Proceedings of 13th International Coal Preparation Conference 397 - 406 1998 [Refereed][Not invited]
  
• Simple and Rapid Cell Growth Estimation Method for Thiobacillus ferrooxidans and the Growth Rate in the Presence of Polyoxyethylenes

  HIROYOSHI Naoki, ITO Mayumi, TSUNEKAWA Masami, HIRAJIMA Tsuyoshi

  Journal of the Mining and Materials Processing Institute of Japan 資源・素材学会 112 (3) 171 - 175 0916-1740 1996/03/25 [Not refereed][Not invited]
  
• Enhancement in Bacterial Leaching of Chalcopyrite by Polyoxyethylene Sorbitan Monolaurate Addition

  Hiroyoshi N, Nakamura T, Tsunekawa M, Hirajima T, Ito M

  Journal of Mineral and Mateial Processing Institute of Japan 資源・素材学会 111 (13) 943 - 948 0916-1740 1995 [Refereed][Not invited]
  

MISC

• Concurrent treatment combining extraction and cementation of anglesite for depression of sphalerite floatability

  相川公政, 伊藤真由美, 草野敦大, JEON Sanghee, PARK Ilhwan, 広吉直樹  資源・素材(Web)  2021-  2021
• A review of recent advances in depression techniques for flotation separation of cu–mo sulfides in porphyry copper deposits

  Ilhwan Park, Seunggwan Hong, Sanghee Jeon, Mayumi Ito, Naoki Hiroyoshi  Metals  10-  (9)  1  -26  2020/09/01  

  Porphyry copper deposits (PCDs) are some of the most important sources of copper (Cu) and molybdenum (Mo). Typically, the separation and recovery of chalcopyrite (CuFeS2 ) and molybdenite (MoS2 ), the major Cu and Mo minerals, respectively, in PCDs are achieved by two-step flotation involving (1) bulk flotation to separate Cu–Mo concentrates and tailings (e.g., pyrite, silicate, and aluminosilicate minerals) and (2) Cu–Mo flotation to separate chalcopyrite and molybdenite. In Cu–Mo flotation, chalcopyrite is depressed using Cu depressants, such as NaHS, Na2 S, Nokes reagent (P2 S5 + NaOH), and NaCN, meaning that it is recovered as tailings, while molybdenite is floated and recovered as froth product. Although conventionally used depressants are effective in the separation of Cu and Mo, they have the potential to emit toxic and deadly gases such as H2 S and HCN when operating conditions are not properly controlled. To address these problems caused by the use of conventional depressants, many studies aimed to develop alternative methods of depressing either chalcopyrite or molybdenite. In this review, recent advances in chalcopyrite and molybdenite depressions for Cu–Mo flotation separation are reviewed, including alternative organic and inorganic depressants for Cu or Mo, as well as oxidation-treatment technologies, such as ozone (O3 ), plasma, hydrogen peroxide (H2 O2 ), and electrolysis, which create hydrophilic coatings on the mineral surface.
• Effects of pyrite on the floatability of lead-activated sphalerite in flotation

  相川公政, 瀬川達也, JEON Sanghee, PARK Ilhwan, TABELIN Carlito, TABELIN Carlito, 広吉直樹, 伊藤真由美  資源・素材学会春季大会(Web)  2020-  2020
• 鉛イオンで活性化された閃亜鉛鉱の浮遊性に及ぼす亜硫酸ナトリウムの影響

  草野敦大, 相川公政, JEON Sanghee, PARK Ilhwan, 広吉直樹, 伊藤真由美  資源・素材学会春季大会(Web)  2020-  2020
• 銅・亜鉛硫化鉱の浮選における閃亜鉛鉱の浮遊抑制

  折井のどか, 相川公政, JEON Sanghee, PARK Ilhwan, 広吉直樹, 伊藤真由美  資源・素材学会春季大会(Web)  2020-  2020
• Effects of several depressants on the floatability of sphalerite in the flotation of copper-zinc sulfides

  伊藤真由美, 折井のどか, 相川公政, JEON Sanghee, PARK Ilhwan, 広吉直樹, MAGWANENG Refilwe, 工藤賢太郎, 砂田和也, 高橋達  資源・素材(Web)  2020-  2020
• Effects of lead ion and sodium sulfite concentrations on sphalerite flotation

  伊藤真由美, 草野敦大, 相川公政, JEON Sanghee, PARK Ilhwan, 広吉直樹  資源・素材(Web)  2020-  2020
• Improvement of flotation and suppression of pyrite oxidation using phosphate-enhanced galvanic microencapsulation (GME) in a ball mill with steel ball media

  Sophea Seng, Carlito Baltazar Tabelin, Yuta Makino, Monyneath Chea, Theerayut Phengsaart, Ilhwan Park, Naoki Hiroyoshi, Mayumi Ito  Minerals Engineering  143-  2019/11/01  [Not refereed][Not invited]
   

  © 2019 Elsevier Ltd Acid mine drainage (AMD) is one of the biggest and most challenging environmental concerns of the mining and mineral processing industries. In our previous study, we reported a new and promising approach to passivate sulfide minerals and limit AMD formation called galvanic microencapsulation (GME), a technique that forms protective coatings via galvanic interactions between sulfide minerals (e.g., pyrite) and metal powders (e.g., zero-valent iron and aluminum). In this paper, the possible application of GME in a ball mill with steel ball media and phosphate to suppress pyrite floatability during coal cleaning and limit pyrite oxidation after disposal is proposed. The results showed that adding phosphate and maintaining sufficient oxygen supply during GME treatment in the ball mill passivated pyrite and suppressed its oxidation via the formation of protective iron phosphate coatings. Moreover, the iron phosphate coatings on pyrite made the mineral more hydrophilic, which improved the separation efficiency during coal flotation.
• 複雑硫化鉱浮選における閃亜鉛鉱の浮遊性低下のメカニズム

  相川公政, 瀬川達也, 得田敦博, TABELIN Carlito, 広吉直樹, 伊藤真由美  資源・素材学会春季大会(Web)  2019-  2019
• 鉛で活性化された閃亜鉛鉱の浮遊性に及ぼすガルバニック相互作用の影響

  伊藤真由美, 相川公政, 瀬川達也, JEON Sanghee, PARK Ilhwan, TABELIN Carlito, 広吉直樹  資源・素材学会北海道支部春季講演会講演要旨集  2019-  2019
• Improvement of hybrid jig separation efficiency using wetting agents for the recycling of mixed-plastic wastes

  Mayumi Ito, Megumi Takeuchi, Ayumu Saito, Nana Murase, Theerayut Phengsaart, Carlito Baltazar Tabelin, Naoki Hiroyoshi, Masami Tsunekawa  Journal of Material Cycles and Waste Management  2019/01/01  [Not refereed][Not invited]
   

  © 2019, Springer Japan KK, part of Springer Nature. We have developed the hybrid jig which combines the principles of jig separation and flotation. However, the selectivity of bubble attachment in water was poor because most plastics have inherently hydrophobic surfaces; so, development of surface modification techniques for plastic particles would expand the application of hybrid jig to the material recycling of plastics. In this study, hybrid jig separation of polypropylene using glass fiber and high impact polystyrene having similar specific gravities and surface wettability were investigated with three wetting agents [Di-2-ethylhexyl sodium sulfosuccinate (Aerosol OT, AOT), sodium lignin sulfonate, and tannic acid]. The results showed that the probability of bubble attachment was influenced by wetting agents because of their strong effects on the surface tension of solution and surface wettability of plastics. The results also suggest that wetting agents could be utilized to control the selectivity of bubble attachment and improve the hybrid jig separation efficiency. In addition, since the hybrid jig separation of polyvinyl chloride and polyamide (nylon-66) using AOT was imperfect, a two-step approach, composed of a pre-wetting step (first step) in a solution containing the wetting agent (AOT) and hybrid jig separation in water (second step), is proposed.
• Prediction of acid mine drainage formation and zinc migration in the tailings dam of a closed mine, and possible countermeasures

  Tabelin Carlito, Sasaki Asuka, Igarashi Toshifumi, Tomiyama Shingo, Villacorte-Tabelin Mylah, Ito Mayumi, Hiroyoshi Naoki  25TH REGIONAL SYMPOSIUM ON CHEMICAL ENGINEERING (RSCE 2018)  268-  2019  [Refereed][Not invited]
  
• The characterization of crushed printed circuit boards of waste mobile phone and recovery of gold components by hybrid-jig separation

  S. Jeon, M. Ito, S. Tanaka, N. Kitajima, C.B. Tabelin, N. Hiroyoshi  Proc. of the 17th Global Joint Seminar on Geo-environmental Engineering,  192  -197  2018  [Not refereed][Not invited]
  
• Suppression of the release of arsenic from arsenopyrite by titanium- and aluminum-based carrier-microencapsulation

  I. Park, C.B. Tabelin, K. Seno, K. Magaribuchi, M. Ito, N. Hiroyoshi  Proc. of the 17th Global Joint Seminar on Geo-environmental Engineering,  305  -311  2018  [Not refereed][Not invited]
  
• Comparison of electrochemical properties of various metal-catecholate complexes for carrier-microencapsulation

  X. Li, C. Harada, I. Park, N. Hiroyoshi, C.B. Tabelin, M. Ito  Proc. of the 17th Global Joint Seminar on Geo-environmental Engineering,  344  -348  2018  [Not refereed][Not invited]
  
• The roles of soluble phases in the release of geogenic arsenic and selenium from tunnel-excavated rocks of marine origin

  C.B. Tabelin, R. Sasaki, T. Igarashi, I. Park, S. Tamoto, T. Arima, M. Ito, N. Hiroyoshi  Proc. of the 17th Global Joint Seminar on Geo-environmental Engineering,  312  -319  2018  [Not refereed][Not invited]
  
• The effects of particle geometrical properties on the settling velocity of plastic particles in jig separation

  T. Phengsaart, A. Azuma, M. Ito, D. Kitayama, S. Kimura, C.B. Tabelin, N. Hiroyoshi  Mining in Asia International Symposium, Bandung, Indonesia  2018  [Not refereed][Not invited]
  
• Improvement of bottom product purity in a continuous jig using a restraining wall

  T. Phengsaart, M. Ito, A. Azuma, S. Kimura, K. Hori, H. Tanno, C.B. Tabelin, N. Hiroyoshi  Mining in Asia International Symposium, Bandung, Indonesia  2018  [Not refereed][Not invited]
  
• Effects of iron-catecholate complexes on pyrite oxidation.

  X. Li, N. Hiroyoshi, K. Naruwa, C. Harada, C.B. Tabelin, M. Ito  The 6th Joint Seminar on Geo-environment Engineering and Recycling (GER 2018)  2018  [Not refereed][Not invited]
  
• Recent advances in jig separation technologies for resources recycling

  T. Phengsaart, M. Ito, S. Jeon, A. Azuma, D. Kitayama, S. Kimura, C.B. Tabelin, N. Hiroyoshi  The 6th Joint Seminar on Geo-environment Engineering and Recycling (GER 2018)  2018  [Not refereed][Not invited]
  
• Characterization of zinc leaching residue in Kabwe area, Zambia.

  M. Silwamba, M. Ito, T. Fukushima, S. Takakuwa, K. Minatogawa, C.B. Tabelin, N. Hiroyoshi, M. Chirwa, K.E. Banda, I. Nyambe  Proc. of 2nd International Kabwe Mine Pollution Amelioration Initiative (KAMPAI) Symposium, Lusaka, Zambia  2018  [Not refereed][Not invited]
  
• Decontamination of zinc leach plant residues: recovery of extracted lead in leach pulp by cementation on ZVI

  M. Silwamba, M. Ito, T. Fukushima, C.B. Tabelin, S. Takakuwa, N. Hiroyoshi, M. Chirwa, K.E. Banda, I. Nyambe  Proc. of 2nd International Kabwe Mine Pollution Amelioration Initiative (KAMPAI) Symposium, Lusaka, Zambia  2018  [Not refereed][Not invited]
  
• Characterization of Khalzan Burgedei peralkaline rare earth deposit, Mongolia and a, Mongolia

  ITO Mayumi  G. Purevdelger, M. Ito, N. Sato, C.B. Tabelin, T. Otake, N. Hiroyoshi, J. Sereenen  24  -29  2018  [Not refereed][Not invited]
  
• he effects of geometrical properties of particles on recycling treatment by physical separation techniques: A review

  T. Phengsaart, M. Ito, N. Kitajima, A. Azuma, C.B. Tabelin, N. Hiroyoshi  Proceedings of the 10th AUN/SEED-net Regional Conference on Geo-Resource and Geological Engineering  446  -459  2017  [Not refereed][Not invited]
  
• Effects of metal ions on flotation of sulfide minerals

  M. Ito, A. Tokuda, T. Segawa, T Horiguchi, C.B. Tabelin, N. Hiroyoshi  Proceedings of International Symposium on Earth Resources and Management  2017  [Not refereed][Not invited]
  
• Electrochemical studies of chalcopyrite dissolution in acidic chloride solutions

  T.T. Nguyen, S. Tsuji, C.B. Tabelin, M. Ito, N. Hiroyoshi  the 14th International Symposium on East Asian Resources Recycling Technology and the Mining and Materials Processing Institute of Japan Fall Meeting  3  -6  2017  [Not refereed][Not invited]
  
• Distribution of different metals in gravity separation of printed circuit boards from mobile phones using jig separator and Knelson concentrator

  S. Tanaka, S. Jeon, N. Kitajima, C.B. Tabelin, N. Hiroyoshi, M. Ito  the 14th International Symposium on East Asian Resources Recycling Technology and the Mining and Materials Processing Institute of Japan Fall Meeting  23  -28  2017  [Not refereed][Not invited]
  
• Carrier-microencapsulation using Al-catechol complex for suppressing arsenic release from arsenopyrite

  I. Park, K. Seno, K. Magaribuchi, C.B. Tabelin, M. Ito, N. Hiroyoshi  the 14th International Symposium on East Asian Resources Recycling Technology and the Mining and Materials Processing Institute of Japan Fall Meeting  10  -15  2017  [Not refereed][Not invited]
  
• Redox properties of metal complexes with catechol and its derivatives

  X. Li, K. Naruwa, C.B. Tabelin, M. Ito, N. Hiroyoshi  the 14th International Symposium on East Asian Resources Recycling Technology and the Mining and Materials Processing Institute of Japan Fall Meeting  4  -9  2017  [Not refereed][Not invited]
  
• Effects of mechanochemical treatment on the stability of arsenic-loaded schwertmannite

  Y. Takeuchi, N. Hiroyoshi, R.D. Alorro, M. Ito, C.B. Tabelin  the 14th International Symposium on East Asian Resources Recycling Technology and the Mining and Materials Processing Institute of Japan Fall Meeting  16  -21  2017  [Not refereed][Not invited]
  
• Effects of zinc ions and their precipitates on flotation of sulfide minerals under alkaline condition

  A. Tokuda, M. Ito, T. Segawa, T. Horiguchi, C.B. Tabelin, N. Hiroyoshi  the 14th International Symposium on East Asian Resources Recycling Technology and the Mining and Materials Processing Institute of Japan Fall Meeting  2  -4  2017  [Not refereed][Not invited]
  
• Synergistic effects of aluminum and other conductive particles on the cementation of gold ions from ammonium thiosulfate solutions

  S. Jeon, H. Takahashi, R. Ponsumrankul, S. Tanaka, C.B. Tabelin, M. Ito, N. Hiroyoshi  the 14th International Symposium on East Asian Resources Recycling Technology and the Mining and Materials Processing Institute of Japan Fall Meeting  183  -186  2017  [Not refereed][Not invited]
  
• Effects of flatness ratio on the jig separation of crushed plastic particles

  T. Phengsaart, A. Azuma, C.B. Tabelin, N. Hiroyoshi, M. Ito  the 14th International Symposium on East Asian Resources Recycling Technology and the Mining and Materials Processing Institute of Japan Fall Meeting  10  -14  2017  [Not refereed][Not invited]
  
• Kinetic modeling of agglomeration-flotation of finely ground chalcopyrite

  V. Hornn, R. Yamazawa, C.B. Tabelin, N. Hiroyoshi, Y. Imaizumi, M. Ito  the 14th International Symposium on East Asian Resources Recycling Technology and the Mining and Materials Processing Institute of Japan Fall Meeting  51  -56  2017  [Not refereed][Not invited]
  
• A review of heterocoagulation and galvanic interaction of sulfide minerals

  S. Seng, M. Motoya, Y. Kontani, C.B. Tabelin, M. Ito, N. Hiroyoshi  the 14th International Symposium on East Asian Resources Recycling Technology and the Mining and Materials Processing Institute of Japan Fall Meeting  40  -45  2017  [Not refereed][Not invited]
  
• Enhanced passivation of pyrite in phosphate solution using ferric-catechol complex and zero-valent iron

  C.B. Tabelin, X. Li, S. Seng, M. Kojima, T. Igarashi, M. Ito, N. Hiroyoshi  the 14th International Symposium on East Asian Resources Recycling Technology and the Mining and Materials Processing Institute of Japan Fall Meeting  8  -13  2017  [Not refereed][Not invited]
  
• Heterocoagulation anf galvanic interaction in mineral processing: A review.

  S. Seng, C.B. Tabelin, M. Kojima, Y. Kontani, M. Ito, N. Hiroyoshi  Proceedings of 1st International Kabwe Mine Pollution Amelioration Initiative (KAMPAI) Symposium  32  2017  [Not refereed][Not invited]
  
• Recovery of gold ions from ammonium thiosulfate solution by aluminum and other conductive particles

  S. Jeon, T. H. Takahashi, R. Pongsumrankul, S. Tanaka, C.B. Tabelin, M. Ito, N. Hiroyoshi  Proceedings of 1st International Kabwe Mine Pollution Amelioration Initiative (KAMPAI) Symposium  32  2017  [Not refereed][Not invited]
  
• Suppressive effects of aluminum-catechol complexes on the release of arsenic from arsenopyrite

  I. Park, K. Seno, K. Magaribuchi, C.B. Tabelin, M. Ito, N. Hiroyoshi  Proceedings of 1st International Kabwe Mine Pollution Amelioration Initiative (KAMPAI) Symposium  31  2017  [Not refereed][Not invited]
  
• Characterization of zinc contaminated mine waste in Kabwe area, Zambia

  M. Ito, T. Fukushima, S. Takakuwa, K. Minatogawa, C.B. Tabelin, N. Hiroyoshi  Proceedings of 1st International Kabwe Mine Pollution Amelioration Initiative (KAMPAI) Symposium  29  2017  [Not refereed][Not invited]
  
• Effects of additional organic functional groups on the redox properties of metal-catecholate complexes

  X. Li, K. Naruwa, C.B. Tabelin, M. Ito, N. Hiroyoshi  Proceedings of 1st International Kabwe Mine Pollution Amelioration Initiative (KAMPAI) Symposium  28  2017  [Not refereed][Not invited]
  
• Effects of particle size and shape during jig separation

  T. Phengsaart, M. Ito, A. Azuma, C.B. Tabelin, N. Hiroyoshi  Proceedings of 1st International Kabwe Mine Pollution Amelioration Initiative (KAMPAI) Symposium  27  2017  [Not refereed][Not invited]
  
• Advanced separation techniques for coarse size fraction of cesium-contaminated soil: Effects of soil particle morphology of soil washing.

  M. Ito, S. Takakuwa, K. Minatogawa, C.B. Tabelin, N. Hiroyoshi, Y. Tomida  Proceedings of 1st International Kabwe Mine Pollution Amelioration Initiative (KAMPAI) Symposium  23-  26  -529  2017  [Not refereed][Not invited]
  
• Gravity separation and its application in coal cleaning and resources recycling: A review

  T. Phengsaart, M. Ito, C.B. Tabelin, G.C. Eliseo, Y. Makino, A. Azuma, N. Hiroyoshi  Proceedings of Coal Mining and Utilization for Sustainable Development International Conference, Chiang Mai, Thailand  301  -308  2017  [Not refereed][Not invited]
  
• Development of gold recovery method from ammonium thiosulfate solution using aluminum and activated carbon

  S. Jeon, H. Takahashi, C.B. Tabelin, M. Ito, N. Hiroyoshi  Proceedings of International Symposium on Earth Science and Technology  608  -610  2017  [Not refereed][Not invited]
  
• Redox potential dependence of chalcopyrite leaching in ferric-chloride solution: Effects of temperature and solution composition

  N. Hiroyoshi, S. Tsuji, T.T. Nguyen, M. Ito, C.B. Tabelin  Proceedings of International Symposium on Earth Science and Technology  615  -618  2017  [Not refereed][Not invited]
  
• Effects of aluminum-catechol complexes on pyrite oxidation

  I. Park, C.B. Tabelin, K. Seno, K. Magaribuchi, M. Ito, N. Hiroyoshi  Proceedings of International Symposium on Earth Science and Technology  611  -614  2017  [Not refereed][Not invited]
  
• Suppression of pyrite oxidation using zero-valent iron powder

  S. Seng, C.B. Tabelin, M. Kojima, Y. Kontani, M. Ito, N. Hiroyoshi  Proceedings of International Symposium on Earth Science and Technology,  619  -622  2017  [Not refereed][Not invited]
  
• Synergistic effects of calcium ion and anionic flocculants on coal flotation

  M. Ito, Y. Makino, G.C. Eliseu, C.B. Tabelin, N. Hiroyoshi  Proceedings of International Symposium on Earth Science and Technology  623  -626  2017  [Not refereed][Not invited]
  
• Attachment of iron oxyhydroxides on pyrite and its effects on pyrite oxidation

  S. Seng, C.B. Tabelin, Y. Kontani, M. Kojima, M. Ito, N. Hiroyoshi  Proceedings of International Symposium on Earth Science and Technology  600  -604  2017  [Not refereed][Not invited]
  
• Characterization of rare earth ore from Khaldzan Burgedei Peralkaline Deposit and its beneficiation by magnetic separation

  M. Ito, P. Galtchandmani, N. Sato, C.B. Tabelin, T. Otake, N. Hiroyoshi  Proceedings of International Symposium on Earth Science and Technology  98  -199  2017  [Not refereed][Not invited]
  
• Advanced soil washing of coarse size fraction containing cesium : Removal of vermiculite by magnetic separation

  伊藤 真由美, 湊川 和貴, Tabelin Carlito Baltazar, 広吉 直樹  地下水・土壌汚染とその防止対策に関する研究集会講演集  22-  389  -391  2016/06/23
• Recent Studies in Laboratory of Mineral Processing and Resources Recycling in Hokkaido University : Applications of Carrier Microencapsulation for Preventing Acid Mine Drainage Formation and Pyrite Flotation in Coal Cleaning

  広吉 直樹, 伊藤 真由美, Tabelin Carlito Baltazar  環境資源工学 = Resources processing : 資源処理技術  63-  (2)  61  -64  2016
• Electrochemical insights on pyrite dissolution in the presence of alumina

  S. Veerawattananun, D. Wiwattanadate, C.B. Tabelin, M. Ito, N. Hiroyoshi, T. Igarashi  the 9th International Conference on Earth Resources Technology  906  -917  2016  [Not refereed][Not invited]
  
• Suppression of arsenopyrite oxidation by carrier microencapsulation using Ti-catechol complex.

  I. Park, K. Magaribuchi, S. Veerawattananum, C.B. Tabelin, M. Ito, N. Hiroyoshi, T. Igarashi  the 9th International Conference on Earth Resources Technology,  918  -928  2016  [Not refereed][Not invited]
  
• Recovery methods for valuable metals from used printed circuit boards: A review.

  S. Jeon, M. Ito, Y. Nagata, N. Kitajima, S. Tanaka, R. Pongsumrankul, T. Yamamoto, C.B. Tabelin, N. Hiroyoshi  the 9th International Conference on Earth Resources Technology  564  -579  2016  [Not refereed][Not invited]
  
• A review of approaches to enhance sulfide-fines recovery by flotation

  V. Hornn, M. Ito, M. Kameya, T. Segawa, R. Yamazawa, C.B. Tabelin, N. Hiroyoshi  the 9th International Conference on Earth Resources Technology  461  -473  2016  [Not refereed][Not invited]
  
• Fundamental electrochemical studies of carrier micro-encapsulation on pyrite: The stability of metal-organic complexes

  S. Veerawattananun, D. Wiwattanadate, C.B. Tabelin, M. Ito, N. Hiroyoshi, T. Igarashi  Proceedings of the 15th Japan-Korea-France-Canada Joint Seminar on Geo-environmental Engineering,  141  -150  2016  [Not refereed][Not invited]
  
• The interplay between pyrite and hematite and its implications in acid mine drainage control

  C.B. Tabelin, S. Veerawattananum, M. Ito, N. Hiroyoshi, T. Igarashi  Proceedings of the 15th Japan-Korea-France-Canada Joint Seminar on Geo-environmental Engineering  141  -150  2016  [Not refereed][Not invited]
  
• 2.3.1 Coal cleaning(2.3 Processing and transportation of coal,2 Coal,II R&D of technology for energy resource utilization,Annual Energy Reviews-2014)

  ITO M.  Journal of the Japan Institute of Energy  94-  (9)  915  -916  2015/09/20
• Effect of copper wires on the recovery of valuable metals and plastics from crushed small home appliances by JIG separation

  Theerayut Phengsaart, Dawan Wiwattanadate, Mayumi Ito, Naoki Hamaya, Tabelin Carlito, Naoki Hiroyoshi  EARTH 2015 - Proceedings of the 13th International Symposium on East Asian Resources Recycling Technology  765  -770  2015/01/01  [Not refereed][Not invited]
   

  Jig separation, which separates particles based on differences in their densities, is one of the oldest and most widely used methods in mineral processing especially for coal cleaning, because of its simplicity of operation, low cost, and high efficiency. In this study, RETAC jig (R&E, Co., Ltd.), which is a modified TACUB jig for plastic-plastic separation, was applied to recover valuable metals and plastics from crushed end-of-life small home appliances. The results show that the separation efficiency decreased in the presence of copper wires. This is due to the copper wires easily get entangled in the separation chamber during jig separation, and these entangled copper wires trap plastic and prevent their motion in the chamber. However, it is unclear which factors control this entanglement process of copper wires. Therefore, effects of factors like length and amount of copper wires was investigated by using model samples of plastics and copper wires mixture. The results showed that both the length and quantity of copper wires were important in the entanglement. The possibility of removing the copper wires by a pre-treatment before the jig separation to increase the separation efficiency and recovery is also reported.
• Sequestration of boron, arsenic and selenium leached from tunnel-excavated rocks through adsorption

  C.B. Tabelin, A. Hashimoto, T. Igarashi, M. Ito, N. Hiroyoshi  Proc. of the 14th Global Joint Seminar on Geo-environmental Engineering  5  2015  [Not refereed][Not invited]
  
• The effects of colloidal α-Fe2O3 on pyrite oxidative dissolution and their implications in the formation of acid mine drainage

  C.B. Tabelin, N. Hiroyoshi, M. Ito, T. Igarashi  Proc. of the 8th International Conference on Geological and Geo-resources Engineering and 7th Mineral Symposium  17  2015  [Not refereed][Not invited]
  
• The effects of ferric-catechol on pyrite oxidation,

  X. Li, S. Veerawattananun, C.B. Tabelin, N. Hiroyoshi, M. Ito  the 13th International Symposium on East Asian Resources Recycling Technology,  80  -87  2015  [Not refereed][Not invited]
  
• Effects of water recirculation on the flotation of Kushiro and Mozambique coals,

  M. Ito, G.C. Eliseu, C.B. Tabelin, N. Hiroyoshi  the 13th International Symposium on East Asian Resources Recycling Technology  80  -87  2015  [Not refereed][Not invited]
  
• Novel method to recover gold from Printed Circuit Boards using ammonium thiosulfate media

  N. Hiroyoshi, Y. Nagata, M. Ito, C.B. Tabelin  the 13th International Symposium on East Asian Resources Recycling Technology,  80  -87  2015  [Not refereed][Not invited]
  
• Recovery of valuable components from crushed mobile phones using Jig Separation

  M. Ito, N. Kitajima, A. Saito, S. Khanchang, C.B. Tabelin, N. Hiroyoshi  the 13th International Symposium on East Asian Resources Recycling Technology  80  -87  2015  [Not refereed][Not invited]
  
• Bubble attachment on plastic particles during hybrid Jig Separation: Measurements during water pulsation,

  M. Ito, N. Murase, A. Saito, C.B. Tabelin, N. Hiroyoshi  the 13th International Symposium on East Asian Resources Recycling Technology, Pattaya  80  -87  2015  [Not refereed][Not invited]
  
• Acid Mine Drainage: Sources, environmental impacts and mitigation approaches

  C.B. Tabelin, M, Ito, N. Hiroyoshi, T. Igarashi  Proc. of the 2nd International Symposium Integrated Research and Education Center for Energy Conversion, Storage, Saving, and Transport Technologies,  13  -14  2015  [Not refereed][Not invited]
  
• 2.3.1 Coal cleaning(2.3 Processing and transportation of coal,2 Coal,II R&D of technology for energy resource utilization,Annual Energy Reviews-2013)

  ITO M.  Journal of the Japan Institute of Energy  93-  (9)  790  -791  2014/09/20
• Leachability of arsenic from tunnel-excavated rock under free- and controlled-flow conditions,

  C.B. Tabelin, T. Igarashi, M. Ito, N. Hiroyoshi  Proc. of the 13th Global Joint Seminar on Geo-Environmental Engineering,  31  -37  2014  [Not refereed][Not invited]
  
• Immobilization of arsenic by schwertmannite synthesized from copper heap leach solutions,

  S. Houngaloune, N. Hiroyoshi, M. Ito, M. Fujimura  Proc. of the 6th international seminar on process hydrometallurgy (Hydroprocess2014)  (3)  2014  [Not refereed][Not invited]
  
• Enhanced encapsulation of pyrite using colloidal “micro-seeds”: Visualization and attachment experiments,

  C.B. Tabelin, N. Hiroyoshi, M. Ito, T. Igarashi  Proc. of the 7th AUN/SEED-Net Geological Engineering Conference and the 2nd AUN/SEED-Net Natural Disaster Conference,  20  2014  [Not refereed][Not invited]
  
• Tunnel-excavated rock: An invisible threat to the environment,

  C.B. Tabelin, T. Igarashi, M. Ito, N. Hiroyoshi  Proc. of the 8th Asian Rock Mechanics Symposium  2554  -2560  2014  [Not refereed][Not invited]
  
• The leaching and speciation behaviors of arsenic and selenium in tunnel-excavated rocks under flow-through conditions,

  C.B. Tabelin, R. Sasaki, T. Igarashi, S. Tamoto, M. Ito, N. Hiroyoshi  Proc. of the 3rd International Conference on Advances in Mining and Tunneling  573  -581  2014  [Not refereed][Not invited]
  
• Gold leaching from waste printed circuit boards by ammonium thiosulfate leaching

  N. Hiroyoshi, Y. Nagata, M. Ito, C.B. Tabelin  Proc. of the 8th International Conference on Earth Resources Technology,  19  -23  2014  [Not refereed][Not invited]
  
• ハイブリッドジグ選別のためのプラスチックの表面改質

  伊藤真由美, 竹内愛, 広吉直樹  資源・素材  2012-  25  2012/09/11  [Not refereed][Not invited]
  
• 各種比重選別によるコバルトリッチクラストと脈石の分離

  伊藤真由美, 朝倉賢, 広吉直樹, 恒川昌美  資源・素材  2012-  19  2012/09/11  [Not refereed][Not invited]
  
• 2.3.1 コールクリーニング(2.3 石炭の加工と輸送技術,2. 石炭,II エネルギー資源の利用技術の進展と研究動向,平成23年における重要なエネルギー関係事項)

  伊藤 真由美  日本エネルギー学会誌  91-  (8)  717  -718  2012/08/20  [Not refereed][Not invited]
  
• 回分式ジグ選別過程の圧力計測に基づく解析

  広吉直樹, 河合孝樹, 武田良介, 伊藤真由美  資源・素材学会春季大会講演集  2012-  214  -215  2012  [Not refereed][Not invited]
  
• 選択的電析・磁化を用いたAl合金の選別技術の開発

  伊藤真由美, 中村啓一郎, ALORRO Richard Diaz, 広吉直樹  資源・素材学会春季大会講演集  2012-  45  -46  2012  [Not refereed][Not invited]
  
• ベトナム・ドンパオ鉱石中のレアアース鉱物の選択粉砕と磁選

  伊藤真由美, 高松慎, 朝倉賢, 広吉直樹  資源・素材学会北海道支部春季講演会講演要旨集  2012-  45  -46  2012  [Not refereed][Not invited]
  
• PVC/Nylonのハイブリッドジグ選別~プラスチックの濡れ性に及ぼすAOT添加の影響~

  伊藤真由美, 竹内愛, 広吉直樹, 恒川昌美  資源・素材学会春季大会講演集  2012-  216  -217  2012  [Not refereed][Not invited]
  
• 銅電解スライム浮選に関しての基礎的研究

  伊藤真由美, 池本貴志, 朝倉賢, 広吉直樹  資源・素材学会北海道支部春季講演会講演要旨集  2012-  43  -44  2012  [Not refereed][Not invited]
  
• ブラウン管ガラス熔融処理残渣からの鉛の溶出機構

  広吉直樹, 高谷佳寛, 岡田敬志, 伊藤真由美, 稲野浩行  資源・素材学会北海道支部春季講演会講演要旨集  2012-  49  -50  2012  [Not refereed][Not invited]
  
• 合成マグネタイトによる塩化物溶液からの白金族の回収

  広吉直樹, 佐藤遼, HOMCHUEN Peet, 雉子谷東, 伊藤真由美  資源・素材学会北海道支部春季講演会講演要旨集  2012-  41  -42  2012  [Not refereed][Not invited]
  
• 低品位銅鉱ヒープリーチング溶液からのシュベルトマナイト生成に関する基礎的研究

  広吉直樹, 河合崇泰, 伊藤真由美, 岡本秀征  資源・素材学会春季大会講演集  2012-  190  -191  2012  [Not refereed][Not invited]
  
• 金属回収のためのFe/Al複合粒子の調製

  伊藤真由美, 祐川香太, 小杉正人, 広吉直樹  資源・素材学会北海道支部春季講演会講演要旨集  2012-  47  -48  2012  [Not refereed][Not invited]
  
• 伊豆・小笠原海域の海底熱水鉱床(硫化物)のJIG選別・浮遊選鉱

  伊藤真由美, 小林幹男, 矢野伸彦  資源・素材  2012-  105  -108  2012  [Not refereed][Not invited]
  
• ジグ内粒子運動の圧力計測に基づく解析

  広吉直樹, 河合孝樹, 武田良介, 伊藤真由美, 恒川昌美  資源・素材  2011-  (2)  197  -198  2011/09/26  [Not refereed][Not invited]
  
• 銅製錬スラグを用いた塩化物溶液からの金回収

  広吉直樹, 雉子谷東, ALORRO Richard Diaz, 伊藤真由美  資源・素材  2011-  (2)  135  -136  2011/09/26  [Not refereed][Not invited]
  
• 銅製錬所鉛澱物の鉛濃縮に関する研究

  広吉直樹, 大山史織, 伊藤真由美  資源・素材  2011-  (2)  203  -204  2011/09/26  [Not refereed][Not invited]
  
• Fe/Al複合粒子を用いた金属溶液からの金属回収

  伊藤真由美, 小杉正人, 祐川香太, 広吉直樹  資源・素材  2011-  (2)  141  -142  2011/09/26  [Not refereed][Not invited]
  
• ベトナム・ドンパオ鉱石中のレアアース鉱物の回収~粉砕・分級特性~

  恒川昌美, 西川千尋, 伊藤真由美, 広吉直樹, SATUR Jacqueline Vidal  資源・素材  2011-  (2)  137  -138  2011/09/26  [Not refereed][Not invited]
  
• 海底熱水鉱床鉱石中の閃亜鉛鉱の浮選挙動

  伊藤真由美, 二口修吏, 朝倉賢, 高橋達, 広吉直樹, 恒川昌美  資源・素材  2011-  (2)  139  -140  2011/09/26  [Not refereed][Not invited]
  
• 聴講記 平成23年度全国鉱山・製錬所現場担当者会議

  伊藤 真由美, 小山 和也, 今宿 晋  資源・素材学会誌  127-  (9)  598  -600  2011/09  [Not refereed][Not invited]
  
• 7-326 Internship Programs in the Course of Sustainable Resources Engineering, School of Engineering, Hokkaido University

  ITO Mayumi, HIROYOSHI Naoki, IGARASHI Toshifumi  工学教育研究講演会講演論文集  23-  (59)  620  -621  2011/08/22  [Not refereed][Not invited]
  
• 平成22年における重要なエネルギー関係事項 II エネルギー資源の利用技術の進展と研究動向 2.石炭 2.3 石炭の加工と輸送技術 2.3.1 コールクリーニング

  伊藤真由美  J Jpn Inst Energy  90-  (8)  737  -737  2011/08/20  [Not refereed][Not invited]
  
• 2.3.1 コールクリーニング(2.3 石炭の加工と輸送技術,2 石炭,II エネルギー資源の利用技術の進展と研究動向,平成22年における重要なエネルギー関係事項)

  伊藤 真由美  日本エネルギー学会誌  90-  (8)  737  -737  2011/08/20  [Not refereed][Not invited]
  
• ヒ素含有銅鉱石のヒープリーチングに関する基礎的研究

  広吉直樹, 河合崇泰, 伊藤正樹, 伊藤真由美  資源・素材学会北海道支部春季講演会講演要旨集  2011-  41  -42  2011  [Not refereed][Not invited]
  
• ベトナム・ドンパオ鉱石中のレアアース鉱物の回収~粉砕・分級特性~

  恒川昌美, 西川千尋, 伊藤真由美, 広吉直樹, SATUR Jacqueline Vidal  資源・素材学会春季大会講演集  2011 (CD-ROM)-  ROMBUNNO.2123  2011  [Not refereed][Not invited]
  
• 海底熱水鉱床鉱石の選鉱に関する基礎的研究~加温浮選とKnelson Concentratorを用いた銅・鉛・亜鉛鉱物の分離~

  伊藤真由美, 朝倉賢, 二口修吏, 高橋達, 広吉直樹, 恒川昌美  資源・素材学会北海道支部春季講演会講演要旨集  2011-  39  -40  2011  [Not refereed][Not invited]
  
• 海底熱水鉱床鉱石のジグによる比重選別

  伊藤真由美, 二口修吏, 朝倉賢, 高橋達, 広吉直樹  海洋工学シンポジウム(CD-ROM)  22nd-  ROMBUNNO.OES22-008  2011  [Not refereed][Not invited]
  
• ジグ内粒子運動の圧力計測に基づく解析

  広吉直樹, 河合孝樹, 武田良介, 伊藤真由美, 恒川昌美  資源・素材学会春季大会講演集  2011 (CD-ROM)-  ROMBUNNO.2103  2011  [Not refereed][Not invited]
  
• 銅製錬スラグを用いた塩化物溶液からの金回収

  広吉直樹, 雉子谷東, ALORRO Richard Diaz, 伊藤真由美  資源・素材学会春季大会講演集  2011 (CD-ROM)-  ROMBUNNO.2110  2011  [Not refereed][Not invited]
  
• ジグ内粒子運動の圧力損失に基づくセンシング

  広吉直樹, 河合孝樹, 武田良介, 伊藤真由美  資源・素材学会北海道支部春季講演会講演要旨集  2011-  33  -34  2011  [Not refereed][Not invited]
  
• 海底熱水鉱床鉱石中の閃亜鉛鉱の浮選挙動

  伊藤真由美, 二口修吏, 朝倉賢, 高橋達, 広吉直樹, 恒川昌美  資源・素材学会春季大会講演集  2011 (CD-ROM)-  ROMBUNNO.2121  2011  [Not refereed][Not invited]
  
• プラスチックのハイブリッドジグ選別に及ぼす濡れ性制御の影響~PVC/NylonとHDPS/PPGFの選別~

  伊藤真由美, 竹内愛, 石田絵美, 赤塚真依子, 広吉直樹, 恒川昌美  資源・素材学会北海道支部春季講演会講演要旨集  2011-  35  -36  2011  [Not refereed][Not invited]
  
• Al合金リサイクルのための選択的電析・磁化技術の開発~銅含有Al合金とその他のAlの選別~

  伊藤真由美, DIAZ ALORRO Richard, 中村啓一郎, 広吉直樹  資源・素材学会北海道支部春季講演会講演要旨集  2011-  37  -38  2011  [Not refereed][Not invited]
  
• 混合プラスチックの湿式比重選別―RETAC JIGの原理と応用

  堀邦紘, 恒川昌美, 阿部中, 広吉直樹, 伊藤真由美, 岡田敦志, 丹野秀昭  高分子学会予稿集(CD-ROM)  59-  (2 Disk1)  ROMBUNNO.3Z03  2010/09/01  [Not refereed][Not invited]
  
• 2.3.1コールクリーニング(2.3 石炭の加工と輸送技術,2 石炭,II エネルギー資源の利用技術の進展と研究動向,平成21年における重要なエネルギー関係事項)

  伊藤 真由美  日本エネルギー学会誌  89-  (8)  762  -763  2010/08/20  [Not refereed][Not invited]
  
• 複雑希土類鉱石中のバストネサイトの浮選分離(第2報)

  恒川昌美, 西川千尋, 伊藤真由美, 広吉直樹, SATUR Jacqueline Vidal  資源・素材学会春季大会講演集  (2)  53  -54  2010/03/30  [Not refereed][Not invited]
  
• 液晶パネルのリサイクルに関する基礎的研究

  恒川昌美, 朝比奈遼, 広吉直樹, 伊藤真由美, 浜野孝俊, 志村一美  資源・素材学会春季大会講演集  (2)  177  -178  2010/03/30  [Not refereed][Not invited]
  
• 硫化鉱物の浮遊性に及ぼすキャリアマイクロエンカプセレーションの効果

  広吉直樹, 川代晋太郎, JHA Rani, Kumari Thakur, 恒川昌美, 伊藤真由美  資源・素材学会春季大会講演集  (2)  51  -52  2010/03/30  [Not refereed][Not invited]
  
• 黄銅鉱浸出のためのマグネタイト利用に関する研究

  広吉直樹, 伊藤正樹, 竹原裕生, 恒川昌美, 伊藤真由美  資源・素材学会春季大会講演集  (1)  29  -30  2010/03/30  [Not refereed][Not invited]
  
• 電線被覆PVCからの鉛除去~三塩基性硫酸鉛と金属酸化物の凝集・分散~

  広吉直樹, 酒井智生, 三村隼生, 恒川昌美, 伊藤真由美  資源・素材学会春季大会講演集  (2)  179  -180  2010/03/30  [Not refereed][Not invited]
  
• 深海底鉱物資源開発のための選鉱法の確立

  伊藤真由美, 恒川昌美, 広吉直樹  資源・素材  2010-  (1)  245  -246  2010  [Not refereed][Not invited]
  
• リバースジグの選別性に及ぼす各種要因の検討

  恒川昌美, 河合孝樹, 石田絵美, 広吉直樹, 伊藤真由美, 阿部中  資源・素材学会北海道支部春季講演会講演要旨集  2010-  45  -46  2010  [Not refereed][Not invited]
  
• マグネタイトによる塩化物溶液からの金吸着

  広吉直樹, 雉子谷東, DIAZ ALORRO Richard, 恒川昌美, 伊藤真由美  資源・素材学会北海道支部春季講演会講演要旨集  2010-  41  -42  2010  [Not refereed][Not invited]
  
• メッキ廃水汚泥の安定性評価と資源化に関する研究

  恒川昌美, 大山史織, 広吉直樹, 伊藤真由美  資源・素材学会北海道支部春季講演会講演要旨集  2010-  27  -28  2010  [Not refereed][Not invited]
  
• カーシュレッダーダストからの低塩素分・低灰分可燃物の回収

  恒川昌美, 小杉正人, 桑山豊, 広吉直樹, 伊藤真由美  資源・素材学会北海道支部春季講演会講演要旨集  2010-  29  -30  2010  [Not refereed][Not invited]
  
• 海底熱水鉱床鉱石の選鉱

  伊藤真由美, 二口修吏, 高橋達, 広吉直樹, 恒川昌美  資源・素材学会北海道支部春季講演会講演要旨集  2010-  43  -44  2010  [Not refereed][Not invited]
  
• 平成20年における重要なエネルギー関係事項 II エネルギー資源の利用技術の進展と研究動向 2.石炭 2.3 石炭の加工と輸送技術 2.3.1 コールクリーニング

  伊藤真由美, 恒川昌美  J Jpn Inst Energy  88-  (8)  680  2009/08/20  [Not refereed][Not invited]
  
• 2.3.1 コールクリーニング(2.3 石炭の加工と輸送技術,2 石炭,II エネルギー資源の利用技術の進展と研究動向,平成20年における重要なエネルギー関係事項)

  伊藤 真由美, 恒川 昌美  日本エネルギー学会誌  88-  (8)  680  -680  2009/08/20  [Not refereed][Not invited]
  
• レパント金鉱山廃石の電気パルス粉砕処理特性

  伊藤真由美, 浜野孝俊, 広吉直樹, 恒川昌美  資源・素材学会春季大会講演集  (2)  83  -84  2009/03/26  [Not refereed][Not invited]
  
• 微粒子のジグ選別

  恒川昌美, 扇子渉, 堀邦紘, 小林利輝, 伊藤真由美, 広吉直樹  資源・素材学会春季大会講演集  (2)  169  -170  2009/03/26  [Not refereed][Not invited]
  
• 非水/水溶液界面への鉛含有微粒子の捕捉現象

  恒川昌美, 三村隼生, 酒井智生, 広吉直樹, 伊藤真由美  資源・素材学会春季大会講演集  (2)  115  -116  2009/03/26  [Not refereed][Not invited]
  
• 綿状物を含むASR粉砕産物中の不燃物,塩素の物理選別による除去

  桑山豊, 伊藤真由美, 赤塚真依子, 広吉直樹, 恒川昌美  資源・素材学会春季大会講演集  (2)  105  -106  2009/03/26  [Not refereed][Not invited]
  
• 圧力センサーを用いたジグ選別のモニタリング

  恒川昌美, 秋元淳希, 堀邦紘, 小林利輝, 広吉直樹, 伊藤真由美  資源・素材学会春季大会講演集  (2)  173  -174  2009/03/26  [Not refereed][Not invited]
  
• コバルトリッチクラストの細粒群のジグ選別

  伊藤真由美, 高橋達, 關村健吾, 広吉直樹, 恒川昌美  資源・素材学会春季大会講演集  (2)  85  -86  2009/03/26  [Not refereed][Not invited]
  
• 各種センサーを用いたジグ選別特性の把握

  恒川昌美, 秋元淳希, 広吉直樹, 伊藤真由美  資源・素材  2009-  37  2009  [Not refereed][Not invited]
  
• Lepanto金鉱山廃石の電気パルス粉砕

  伊藤真由美, 浜野孝俊, 広吉直樹, 恒川昌美  資源・素材  2009-  31  2009  [Not refereed][Not invited]
  
• 複雑希土類鉱石中のバストネサイトの浮選分離

  恒川昌美, 西川千尋, VIDAL SATUR Jacqueline, 伊藤真由美, 広吉直樹  資源・素材  2009-  35  2009  [Not refereed][Not invited]
  
• 焼却灰の脱塩素特性に関する研究

  恒川昌美, 朝比奈遼, 広吉直樹, 伊藤真由美  資源・素材学会北海道支部春季講演会講演要旨集  2009-  55  -56  2009  [Not refereed][Not invited]
  
• 微粒子ジグ選別における諸要因の影響

  扇子渉, 恒川昌美, 広吉直樹, 伊藤真由美  資源・素材  2009-  36  2009  [Not refereed][Not invited]
  
• カテコール類似物質による酸化鉱物の選択的表面改質

  広吉直樹, 川代晋太郎, JHA Rani, Kumari Thakur, 恒川昌美, 伊藤真由美  資源・素材学会北海道支部春季講演会講演要旨集  2009-  51  -52  2009  [Not refereed][Not invited]
  
• 非水溶媒中に懸濁する鉛含有微粒子の固体表面への吸着除去

  広吉直樹, 酒井智生, 三村隼生, 恒川昌美, 伊藤真由美  資源・素材学会北海道支部春季講演会講演要旨集  2009-  53  -54  2009  [Not refereed][Not invited]
  
• 家電プラスチックのアドバンストジグ選別

  伊藤真由美, 赤塚真依子, 石田絵美, 高橋達, 桑山豊, 広吉直樹, 恒川昌美  資源・素材  2009-  38  2009  [Not refereed][Not invited]
  
• コバルトリッチクラストの選鉱法の確立

  伊藤真由美, 恒川昌美, 広吉直樹  資源・素材  2009-  (1)  235  -238  2009  [Not refereed][Not invited]
  
• 硫酸溶液中での黄銅鉱浸出に対するマグネタイトの影響

  広吉直樹, 伊藤正樹, 竹原裕生, 恒川昌美, 伊藤真由美  資源・素材学会北海道支部春季講演会講演要旨集  2009-  49  -50  2009  [Not refereed][Not invited]
  
• 複雑希土類鉱石の選鉱

  恒川昌美, 西川千尋, SATUR Jacqueline Vidal, 伊藤真由美, 広吉直樹  資源・素材学会北海道支部春季講演会講演要旨集  2009-  47  -48  2009  [Not refereed][Not invited]
  
• コバルトリッチクラストの選鉱と希少金属の回収

  伊藤真由美, 高橋達, ALORRO Richard D, 關村健吾, 広吉直樹, 恒川昌美  資源・素材  2009-  32  2009  [Not refereed][Not invited]
  
• 電線被覆PVCからの鉛含有微粒子の除去

  広吉直樹, 酒井智生, 三村隼生, 恒川昌美, 伊藤真由美  資源・素材  2009-  41  2009  [Not refereed][Not invited]
  
• 平成19年における重要なエネルギー関係事項 II エネルギー資源の利用技術の進展と研究動向 2.石炭 2.3 石炭の加工と輸送技術 2.3.1 コールクリーニング

  伊藤真由美, 恒川昌美  J Jpn Inst Energy  87-  (8)  606  -606  2008/08/20  [Not refereed][Not invited]
  
• 2.3.1 コールクリーニング(2.3 石炭の加工と輸送技術,2. 石炭,II エネルギー資源の利用技術の進展と研究動向,平成19年における重要なエネルギー関係事項)

  伊藤 真由美, 恒川 昌美  日本エネルギー学会誌  87-  (8)  606  -606  2008/08/20  [Not refereed][Not invited]
  
• コバルトリッチクラストの選鉱に関する基礎的研究 第二報

  恒川昌美, 伊藤真由美, 關村健吾, 山口英志, 高橋達, 柏谷公希, 広吉直樹  資源・素材学会春季大会講演集  (2)  197  -198  2008/03/27  [Not refereed][Not invited]
  
• ジグ選別における粒子の沈降挙動と選別パターン

  堀邦紘, 恒川昌美, 広吉直樹, 伊藤真由美  資源・素材学会春季大会講演集  (2)  109  -110  2008/03/27  [Not refereed][Not invited]
  
• 連続式網下気室型ジグ(RETAC Jig)選別の高度化に関する基礎的研究

  恒川昌美, 小林利輝, 堀邦紘, 岡田英明, 広吉直樹, 伊藤真由美  資源・素材学会春季大会講演集  (2)  107  -108  2008/03/27  [Not refereed][Not invited]
  
• 鉛汚染土壌からの鉛分リーチングおよび鉛濃縮に関する基礎的研究 第4報

  伊藤真由美, 高田政雄, 帆苅直弘, 恒川昌美, 広吉直樹  資源・素材学会春季大会講演集  (2)  189  -190  2008/03/27  [Not refereed][Not invited]
  
• 黄銅鉱のカラムリーチング

  広吉直樹, 竹原裕生, 桑澤毅成, 恒川昌美, 伊藤真由美  資源・素材学会北海道支部春季講演会講演要旨集  2008-  43  -44  2008  [Not refereed][Not invited]
  
• 非水/水溶液界面への微粒子の捕捉現象とそのメカニズム

  恒川昌美, 三村隼生, 佐々木勇太, 広吉直樹, 伊藤真由美  資源・素材学会北海道支部春季講演会講演要旨集  2008-  47  -48  2008  [Not refereed][Not invited]
  
• コバルトリッチクラスト・ノジュールと脈石のJIG選別~大型JIG処理試験と最適運転条件の検討~

  伊藤真由美, 高橋達, 關村健吾, 広吉直樹, 恒川昌美  資源・素材学会北海道支部春季講演会講演要旨集  2008-  45  -46  2008  [Not refereed][Not invited]
  
• 鉛汚染土壌からの鉛分の溶解およびセメンテーション~セメンテーションの検討~

  伊藤真由美, 高田政雄, 帆苅直弘, 恒川昌美, 広吉直樹  資源・素材  2008-  44  2008  [Not refereed][Not invited]
  
• ジグ選別プロセスにおける粒子流動化現象と最適条件

  恒川昌美, 秋元淳希, 堀邦紘, 広吉直樹, 伊藤真由美  資源・素材学会北海道支部春季講演会講演要旨集  2008-  7  -8  2008  [Not refereed][Not invited]
  
• 微粒子用ジグ選別機に関する基礎的研究

  恒川昌美, 扇子渉, 堀邦紘, 小林利輝, 広吉直樹, 伊藤真由美  資源・素材学会北海道支部春季講演会講演要旨集  2008-  5  -6  2008  [Not refereed][Not invited]
  
• 湿式サイクロンにおける微粒子の挙動に及ぼす粒子形状の影響

  柏谷公希, 能町聖彦, 伊藤真由美, 広吉直樹, 恒川昌美  資源・素材  2008-  32  2008  [Not refereed][Not invited]
  
• コバルトリッチクラストの選鉱に関する基礎的研究 第三報

  關村健吾, 恒川昌美, 伊藤真由美, 高橋達, 広吉直樹  資源・素材  2008-  17  2008  [Not refereed][Not invited]
  
• プラスチックの表面改質とハイブリットジグへの適用

  赤塚真依子, 伊藤真由美, SATUR Jacqueline, 桑山豊, 広吉直樹, 恒川昌美  資源・素材  2008-  34  2008  [Not refereed][Not invited]
  
• 平成18年における重要なエネルギー関係事項 II エネルギー資源の利用技術の進展と研究動向

  大渕修, 前川忠, 稲葉仁, 小俣光司, 田本芳隆, 佐藤信也, 古川博文, 川島裕之, 小谷野耕二, 鷹觜利公, 伊藤真由美, 恒川昌美, 溝口忠一, 大木章, 安田肇, 山田理, 海保守, 加藤健次, 高橋佳司, 吉澤徳子, 小針厚志, 佐藤憲明, 本村真澄, 末廣能史, 浅野嘉章, 湯浅和昭, 沼田義文, 荒木和路, 柳川達彦, 富田雅人, 竹口聡一, 横山博文, 作田宏一, 村岡洋文, 松宮ひかる, 大澤弘敬, 小木知子, 名木稔, 坂田興, 後藤慎吾  J Jpn Inst Energy  86-  (8)  546  -614  2007/08/20  [Not refereed][Not invited]
  
• 2.3.1 コールクリーニング(2.3 石炭の加工と輸送技術,2. 石炭,II エネルギー資源の利用技術の進展と研究動向,平成18年における重要なエネルギー関係事項)

  伊藤 真由美, 恒川 昌美  日本エネルギー学会誌  86-  (8)  568  -569  2007/08/20  [Not refereed][Not invited]
  
• Recovery of Heavy Metals from MSW Melting Fly Ash by Carrier-in-Pulp Method

  ALORRO Richard D., HIROYOSHI Naoki, ITO Mayumi, TSUNEKAWA Masami  春季大会講演集. I, 資源編  19-  (2)  161  -162  2007/03/29
• 鉛汚染土壌からの鉛分リーチングおよび鉛濃縮に関する基礎的研究 第3報

  伊藤真由美, 帆苅直弘, 高田政雄, 恒川昌美, 広吉直樹  資源・素材学会春季大会講演集  19-  (1)  KIKAKU.85-KIKAKU.86  -85"-"企画-86"  2007/03/29  [Not refereed][Not invited]
  
• 黄銅鉱浸出の電位制御による最適化

  桑澤毅成, 恩田真吾, 広吉直樹, 恒川昌美, 伊藤真由美  資源・素材学会春季大会講演集  19-  (2)  45  -46  2007/03/29  [Not refereed][Not invited]
  
• JIGを用いたコバルトリッチクラストの選鉱

  恒川昌美, 伊藤真由美, 山口英志, 關村健吾, 柏谷公希, 広吉直樹  資源・素材学会春季大会講演集  19-  (2)  53  -54  2007/03/29  [Not refereed][Not invited]
  
• カーシュレッダーダスト(ASR)の有価物湿式回収プロセスの開発~ASRのジグ選別における繊維状物質の挙動~

  伊藤真由美, 桑山豊, 赤塚真依子, 堀邦鉱, 広吉直樹, 恒川昌美  資源・素材学会春季大会講演集  19-  (2)  23  -24  2007/03/29  [Not refereed][Not invited]
  
• 廃Ni‐MH電池リサイクルプロセスにおける破砕微粉の物理選別

  伊藤真由美, 角谷直宏, 柏谷公希, 広吉直樹, 恒川昌美  資源・素材学会春季大会講演集  19-  (2)  31  -32  2007/03/29  [Not refereed][Not invited]
  
• ハイブリッドジグ選別におけるプラスチック表面の濡れ性の影響

  恒川昌美, 岡田英明, 堀邦紘, 越智大司, 小林利輝, 上田将経, 広吉直樹, 伊藤真由美  資源・素材学会春季大会講演集  19-  (2)  25  -26  2007/03/29  [Not refereed][Not invited]
  
• カーシュレッダーダスト(ASR)の有価物湿式回収プロセスの開発~界面活性剤溶液中でのASR浸漬・解砕挙動~

  伊藤真由美, 赤塚真依子, 桑山豊, 堀邦紘, 広吉直樹, 恒川昌美  資源・素材学会春季大会講演集  19-  (2)  21  -22  2007/03/29  [Not refereed][Not invited]
  
• 微量の水分を含む有機溶媒中での疎水性微粒子の分散・凝集

  恒川昌美, 佐々木勇太, 中村孔亮, 伊藤真由美, 広吉直樹, YOO Kyoung Keun  資源・素材学会春季大会講演集  19-  (2)  51  -52  2007/03/29  [Not refereed][Not invited]
  
• プラスチック微粒子の湿式サイクロンによる分級

  柏谷公希, 能町聖彦, 伊藤真由美, 山本康彰, 広吉直樹, 恒川昌美  資源・素材学会春季大会講演集  19-  (2)  29  -30  2007/03/29  [Not refereed][Not invited]
  
• 鉛汚染土壌からの鉛分リーチングおよび鉛濃縮に関する基礎的研究 第3報

  伊藤 真由美, 帆苅 直弘, 高田 政雄, 恒川 昌美, 広吉 直樹  春季大会講演集. I, 資源編  19-  (2)  "企画  -85"-"企画-86"  2007/03/29  [Not refereed][Not invited]
  
• カーシュレッダーダスト(ASR)の有価物湿式回収プロセスの開発 : 界面活性剤溶液中でのASR浸漬・解砕挙動

  伊藤 真由美, 赤塚 真依子, 桑山 豊, 堀 邦紘, 広吉 直樹, 恒川 昌美  春季大会講演集. I, 資源編  19-  (2)  21  -22  2007/03/29  [Not refereed][Not invited]
  
• カーシュレッダーダスト(ASR)の有価物湿式回収プロセスの開発 : ASRのジグ選別における繊維状物質の挙動

  伊藤 真由美, 桑山 豊, 赤塚 真依子, 堀 邦鉱, 広吉 直樹, 恒川 昌美  春季大会講演集. I, 資源編  19-  (2)  23  -24  2007/03/29  [Not refereed][Not invited]
  
• ハイブリッドジグ選別におけるプラスチック表面の濡れ性の影響

  恒川 昌美, 岡田 英明, 堀 邦紘, 越智 大司, 小林 利輝, 上田 将経, 広吉 直樹, 伊藤 真由美  春季大会講演集. I, 資源編  19-  (2)  25  -26  2007/03/29  [Not refereed][Not invited]
  
• プラスチック微粒子の湿式サイクロンによる分級

  柏谷 公希, 能町 聖彦, 伊藤 真由美, 山本 康彰, 広吉 直樹, 恒川 昌美  春季大会講演集. I, 資源編  19-  (2)  29  -30  2007/03/29  [Not refereed][Not invited]
  
• 廃Ni-MH電池リサイクルプロセスにおける破砕微粉の物理選別

  伊藤 真由美, 角谷 直宏, 柏谷 公希, 広吉 直樹, 恒川 昌美  春季大会講演集. I, 資源編  19-  (2)  31  -32  2007/03/29  [Not refereed][Not invited]
  
• 黄銅鉱浸出の電位制御による最適化

  桑澤 毅成, 恩田 真吾, 広吉 直樹, 恒川 昌美, 伊藤 真由美  春季大会講演集. I, 資源編  19-  (2)  45  -46  2007/03/29  [Not refereed][Not invited]
  
• 微量の水分を含む有機溶媒中での疎水性微粒子の分散・凝集

  恒川 昌美, 佐々木 勇太, 中村 孔亮, 伊藤 真由美, 広吉 直樹, YOO Kyoung Keun  春季大会講演集. I, 資源編  19-  (2)  51  -52  2007/03/29  [Not refereed][Not invited]
  
• JIGを用いたコバルトリッチクラストの選鉱

  恒川 昌美, 伊藤 真由美, 山口 英志, 關村 健吾, 柏谷 公希, 広吉 直樹  春季大会講演集. I, 資源編  19-  (2)  53  -54  2007/03/29  [Not refereed][Not invited]
  
• 疎水性プラスチック微粒子の湿式サイクロンによる分級

  柏谷公希, 能町聖彦, 伊藤真由美, 山本康彰, 広吉直樹, 恒川昌美  資源・素材学会北海道支部春季講演会講演要旨集  2007-  47  -48  2007  [Not refereed][Not invited]
  
• 次世代型石炭高効率発電のためのアドバンストコールクリーニング技術の動向

  伊藤真由美  資源・素材  2007-  (A/B)  241  -244  2007  [Not refereed][Not invited]
  
• Leaching&Cementation法による鉛汚染土壌の浄化~処理プロセスの検討~

  伊藤真由美, 高田政雄, 帆苅直弘, 広吉直樹, 恒川昌美  地下水・土壌汚染とその防止対策に関する研究集会講演集(CD-ROM)  13th-  ROMBUNNO.S5-5  2007  [Not refereed][Not invited]
  
• カーシュレッダーダスト(ASR)の有価物湿式回収プロセスの開発~ASRの溶液浸漬性評価と浸漬機構の解明~

  伊藤真由美, 赤塚真依子, 桑山豊, 堀邦紘, 広吉直樹, 恒川昌美  資源・素材学会北海道支部春季講演会講演要旨集  2007-  49  -50  2007  [Not refereed][Not invited]
  
• Leaching&Cementation法による鉛汚染土壌の浄化~鉛の除去率に及ぼす各種因子の影響~

  伊藤真由美, 帆苅直弘, 高田政雄, 広吉直樹, 恒川昌美  地下水・土壌汚染とその防止対策に関する研究集会講演集(CD-ROM)  13th-  ROMBUNNO.S5-4  2007  [Not refereed][Not invited]
  
• 鉛汚染土壌からの鉛除去に関する研究~クエン酸による土中鉛浸出と鉄粉濃縮挙動の把握~

  伊藤真由美, 高田政雄, 帆苅直弘, 恒川昌美, 広吉直樹  資源・素材学会北海道支部春季講演会講演要旨集  2007-  27  -28  2007  [Not refereed][Not invited]
  
• 連続式ジグのプラスチック選別特性~回分式ジグとの比較~

  恒川昌美, 小林利輝, 堀邦紘, 越智大司, 岡田英明, 広吉直樹, 伊藤真由美  資源・素材学会北海道支部春季講演会講演要旨集  2007-  45  -46  2007  [Not refereed][Not invited]
  
• 深海底鉱物資源の有効利用に関する研究~コバルトリッチクラストと基盤岩のJIG選別~

  恒川昌美, 伊藤真由美, 山口英志, 關村健吾, 柏谷公希, 広吉直樹  資源・素材学会北海道支部春季講演会講演要旨集  2007-  43  -44  2007  [Not refereed][Not invited]
  
• 平成17年における重要なエネルギー関係事項 II エネルギー資源の利用技術の進展と研究動向

  山川千秋, 前川忠, 坂西欣也, 小俣光司, 田本芳隆, 佐藤信也, 古川博文, 川島裕之, 小谷野耕二, 鷹觜利公, 伊藤真由美, 恒川昌美, 溝口忠一, 大木章, 安田肇, 山田理, 海保守, 加藤健次, 高橋佳司, 吉澤徳子, 小針厚志, 小野寺博, 本村真澄, 末廣能史, 舛田直之, 湯浅和昭, 沼田義文, 荒木和路, 柳川達彦, 富田雅人, 鈴木聡, 横山博文, 作田宏一, 村岡洋文, 松宮ひかる, 大澤弘敬, 小木知子, 名木稔, 坂田興, 佐藤充克  J Jpn Inst Energy  85-  (8)  612  -676  2006/08/20  [Not refereed][Not invited]
  
• 2.3.1 コールクリーニング(2.3 石炭の加工と輸送技術,2. 石炭,II エネルギー資源の利用技術の進展と研究動向,平成17年における重要なエネルギー関係事項)

  伊藤 真由美, 恒川 昌美  日本エネルギー学会誌  85-  (8)  633  -635  2006/08/20  [Not refereed][Not invited]
  
• 平成18年度全国鉱山製錬所現場担当者会議 聴講記

  安達 毅, 伊藤 真由美, 宇田 哲也, 植田 滋, 小俣 孝久, 前田 浩孝  資源と素材 : 資源・素材学会誌 : journal of the Mining and Materials Processing Institute of Japan  122-  (6)  375  -377  2006/07/25  [Not refereed][Not invited]
  
• 見学会 A班(資源部門) 柵原鉱山見学記 (平成18年度 全国鉱山・製錬所「現場担当者会議」報告)

  伊藤 真由美  鉱山  59-  (6)  20  -22  2006/07  [Not refereed][Not invited]
  
• The 8th International Symposium on East Asian Resources Recycling Technology (EARTH2005)

  伊藤 真由美  Journal of the Mining and Materials Processing Institute of Japan  122-  (4)  163  -165  2006/05/25  [Not refereed][Not invited]
  
• Effects of Carrier-Microencapsulation on Surface Chemical Properties of Pyrite

  SATUR Jacqueline, HIROYOSHI Naoki, ITO Mayumi, TSUNEKAWA Masami  春季大会講演集. I, 資源編  18-  (2)  65  -66  2006/03/27
• 鉛汚染土壌からの鉛分リーチングおよび鉛濃縮に関する基礎的研究 第2報

  伊藤真由美, 久保泰政, 帆苅直弘, 広吉直樹, 恒川昌美  資源・素材学会春季大会講演集  18-  (2)  179  -180  2006/03/27  [Not refereed][Not invited]
  
• リーチングとセメンテーションによる都市ゴミ溶融飛灰からのPb除去・回収

  広吉直樹, 三谷慎一, 伊藤真由美, 恒川昌美  資源・素材学会春季大会講演集  18-  (2)  135  -136  2006/03/27  [Not refereed][Not invited]
  
• プラスチックのジグ選別における分離プロセスに関する一考察

  恒川昌美, 越智大司, 堀邦紘, 上田将経, 岡田英明, 広吉直樹, 伊藤真由美, 伊藤正澄  資源・素材学会春季大会講演集  18-  (2)  47  -48  2006/03/27  [Not refereed][Not invited]
  
• ジグ選別における水の圧力損失と選別性の関係

  堀邦紘, 恒川昌美, 上田将経, 越智大司, 広吉直樹, 伊藤真由美, 伊藤正澄  資源・素材学会春季大会講演集  18-  (2)  43  -44  2006/03/27  [Not refereed][Not invited]
  
• 気泡を利用したジグ選別の改良

  恒川昌美, 上田将経, 堀邦紘, 越智大司, 岡田英明, 広吉直樹, 伊藤真由美, 伊藤正澄  資源・素材学会春季大会講演集  18-  (2)  45  -46  2006/03/27  [Not refereed][Not invited]
  
• ジグ選別における水の圧力損失と選別性の関係

  堀 邦紘, 恒川 昌美, 上田 将経, 越智 大司, 広吉 直樹, 伊藤 真由美, 伊藤 正澄  春季大会講演集. I, 資源編  18-  (2)  43  -44  2006/03/27  [Not refereed][Not invited]
  
• 気泡を利用したジグ選別の改良

  恒川 昌美, 上田 将経, 堀 邦紘, 越智 大司, 岡田 英明, 広吉 直樹, 伊藤 真由美, 伊藤 正澄  春季大会講演集. I, 資源編  18-  (2)  45  -46  2006/03/27  [Not refereed][Not invited]
  
• プラスチックのジグ選別における分離プロセスに関する一考察

  恒川 昌美, 越智 大司, 堀 邦紘, 上田 将経, 岡田 英明, 広吉 直樹, 伊藤 真由美, 伊藤 正澄  春季大会講演集. I, 資源編  18-  (2)  47  -48  2006/03/27  [Not refereed][Not invited]
  
• リーチングとセメンテーションによる都市ゴミ溶融飛灰からのPb除去・回収

  広吉 直樹, 三谷 慎一, 伊藤 真由美, 恒川 昌美  春季大会講演集. I, 資源編  18-  (2)  135  -136  2006/03/27  [Not refereed][Not invited]
  
• 鉛汚染土壌からの鉛分リーチングおよび鉛濃縮に関する基礎的研究 第2報

  伊藤 真由美, 久保 泰政, 帆苅 直弘, 広吉 直樹, 恒川 昌美  春季大会講演集. I, 資源編  18-  (2)  179  -180  2006/03/27  [Not refereed][Not invited]
  
• 微量の水分を含む非水溶液中での微粒子の分散・凝集

  恒川昌美, 佐々木勇太, 中村孔亮, 伊藤真由美, 広吉直樹  資源・素材学会北海道支部春季講演会講演要旨集  2006-  57  -58  2006  [Not refereed][Not invited]
  
• 鉛汚染土壌からの鉛分リーチングおよび鉛濃縮に関する基礎的研究 第2報

  伊藤真由美, 久保泰政, 帆苅直弘, 広吉直樹, 恒川昌美  地下水・土壌汚染とその防止対策に関する研究集会講演集(CD-ROM)  12th-  ROMBUNNO.S4-5  2006  [Not refereed][Not invited]
  
• マイクロX線CTを用いた高電圧パルス試験試料の亀裂パターン観察

  横田光博, 中宮優子, 大和田秀二, 趙祥鎬, 伊藤真由美, 金子勝比古  資源・素材  2006-  30  2006  [Not refereed][Not invited]
  
• プラスチックのハイブリッドジグ選別のための表面物性評価

  恒川昌美, 岡田英明, 堀邦紘, 上田将経, 越智大司, 広吉直樹, 伊藤真由美, 伊藤正澄  資源・素材学会北海道支部春季講演会講演要旨集  2006-  55  -56  2006  [Not refereed][Not invited]
  
• ハイブリッド自動車用ニッケル水素電池からの湿式磁選法を用いた有価金属の回収

  恒川昌美, 角谷直宏, 伊藤真由美, 広吉直樹  資源・素材学会北海道支部春季講演会講演要旨集  2006-  51  -52  2006  [Not refereed][Not invited]
  
• 鉛汚染土壌の新しい修復法に関する基礎的研究

  伊藤真由美, 帆苅直弘, 久保泰政, 恒川昌美, 広吉直樹  資源・素材学会北海道支部春季講演会講演要旨集  2006-  11  -12  2006  [Not refereed][Not invited]
  
• 廃コンクリートの湿式選別リサイクルプロセスの開発~再生骨材の性状に及ぼす原コンクリートの影響~

  恒川昌美, 桑澤毅成, 伊藤真由美, 広吉直樹, 名和豊春, 西田法文, 田村幸保, 伊藤正澄  資源・素材学会北海道支部春季講演会講演要旨集  2006-  53  -54  2006  [Not refereed][Not invited]
  
• コバルトリッチクラストの選鉱に関する基礎的研究

  恒川昌美, 山口英志, 伊藤真由美, 広吉直樹, 柴崎洋志, 吉田友之  資源・素材  2006-  (C/D)  167  -168  2006  [Not refereed][Not invited]
  
• 破砕・粉砕技術の活用による金属含有廃棄物リサイクリングの高効率化に関する調査研究

  古山隆, 伊藤真由美, 今井哲男, 大矢仁史, 大和田秀二, 神田良照, 斎藤淳, 坂本宏, 佐野茂, 柴山敦, 多屋貞男, 中沢広, 新田幸人, 橋口敬生, 原田光久, 藤田豊久, 森祐行  日本鉱業振興会助成研究成果報告書  2005-  95  -100  2005/11/11  [Not refereed][Not invited]
  
• 平成16年における重要なエネルギー関係事項 II エネルギー資源の利用技術の進展と研究動向

  中本亮一, 前川忠, 坂西欣也, 小俣光司, 田本芳隆, 佐藤信也, 古川博文, 川島裕之, 樫村奈生, 鷹はし利公, 恒川昌美, 伊藤真由美, 溝口忠一, 大木章, 安田肇, 山田理, 海保守, 加藤健次, 高橋佳司, 原田博文, 原一夫, 小野寺博, 本村真澄, 末広能史, 舛田直之, 湯浅和昭, 沼田義文, 岡本洋三, 柳川達彦, 富田雅人, 鈴木聡, 永山正吾, 作田宏一, 村岡洋文, 松宮あきら, 大沢弘敬, 小木知子, 名木稔, 坂田興, 佐藤充克  J Jpn Inst Energy  84-  (8)  606  -669  2005/08/20  [Not refereed][Not invited]
  
• 2.3.1 コールクリーニング(2.3 石炭の加工と輸送技術,2.石炭,II エネルギー資源の利用技術の進展と研究動向,平成16年における重要なエネルギー関係項目)

  恒川 昌美, 伊藤 真由美  日本エネルギー学会誌  84-  (8)  629  -630  2005/08/20  [Not refereed][Not invited]
  
• 鉛汚染土壌からのクエン酸による鉛分リーチングおよび担体を用いた鉛濃縮・除去に関する基礎的研究

  伊藤真由美, 久保泰政, 広吉直樹, 恒川昌美  地球環境シンポジウム講演論文集  13th-  311  -315  2005/07/14  [Not refereed][Not invited]
   

  It is important to establish washing methods for contaminated soils by toxic metals such as lead in rifle shooting areas. In the lead-contaminated soils weathered after a long period, metal lead is extracted as ion, and is penetrated into the ground, depositing on the surface of soil particles or immersing into the pores of the particles mainly as a lead carbonate. Therefore it is difficult to remove lead from the weathered contaminated soils by conventional soil washing techniques such as sizing or gravity separation. In this study, a new method is proposed for removing lead from the contaminated soil. Lead components in the soil are extracted into the solution by sodium citrate as a chelating agent, and the extracted lead is precipitated on the surface of iron powder by redox reaction. Then the iron powder is recovered by physical separation techniques such as magnetic separation. Thermodynamic calculation showed that removal efficiency of lead was higher when leaching iron powder, sodium citrate, and lead carbonate simultaneously than when leaching first lead carbonate by sodium citrate and then adding iron powder to the lead citrate solution. This calculation result was supported by ICP and XRD results. The XRD pattern for the iron powder recovered by magnetic separation indicated that lead is present as solid form on the powder. The recovered powder would be used as a lead source in smelting process.
• 物理選別による廃2次電池中の有価物回収 II

  恒川昌美, 古谷尚稔, 広吉直樹, 伊藤真由美, 北村修, 市川良二, 菊田和幸  資源・素材学会春季大会講演集  17-  (2)  63  -64  2005/03/28  [Not refereed][Not invited]
  
• 土壌中のシアンの形態

  恒川昌美, 伊藤真由美  資源・素材学会春季大会講演集  17-  (1)  KIKAKU.93-KIKAKU.96  -93"-"企画-96"  2005/03/28  [Not refereed][Not invited]
  
• 電気パルス粉砕での単体分離促進機構に対する各種試料物性の影響―各種鉱物粒子分散セメント試料に関する検討―

  大和田秀二, 伊藤真由美, 中川剛直, 中宮優子, ちょう祥こう  資源・素材学会春季大会講演集  17-  (2)  67  -68  2005/03/28  [Not refereed][Not invited]
  
• 低比重細粒破砕物のジグ選別における粒子流動性と最適分離条件

  恒川昌美, 堀邦紘, 上田将経, 越智大司, 広吉直樹, 伊藤真由美, 伊藤正澄  資源・素材学会春季大会講演集  17-  (2)  55  -56  2005/03/28  [Not refereed][Not invited]
  
• 再生粗骨材を用いたコンクリートの強度に及ぼす湿式選別条件の影響

  恒川昌美, 上杉浩平, 伊藤真由美, 伊藤正澄, 名和豊春, 西田法文, 広吉直樹, 平島剛  資源・素材学会春季大会講演集  17-  (2)  173  -174  2005/03/28  [Not refereed][Not invited]
  
• 二成分系粉砕における各種優先破壊・単体分離モデルの比較

  大和田秀二, 大宮隆之, 森川隆彦, 伊藤真由美  資源・素材学会春季大会講演集  17-  (1)  KIKAKU.49-KIKAKU.52  -49"-"企画-52"  2005/03/28  [Not refereed][Not invited]
  
• プラスチックのジグ選別における粒子物性の影響

  恒川昌美, 上田将経, 堀邦紘, 越智大司, 広吉直樹, 伊藤真由美, 伊藤正澄  資源・素材学会春季大会講演集  17-  (2)  57  -58  2005/03/28  [Not refereed][Not invited]
  
• 鉛汚染土壌からの鉛分リーチングおよび鉛濃縮に関する基礎的研究

  伊藤真由美, 久保泰政, 広吉直樹, 恒川昌美  資源・素材学会春季大会講演集  17-  (2)  145  -146  2005/03/28  [Not refereed][Not invited]
  
• キャリア浮選を用いた白色結晶質石灰石の高品位化

  恒川昌美, 本間佑吾, 柳庚きん, 広吉直樹, 伊藤真由美  資源・素材学会春季大会講演集  17-  (2)  53  -54  2005/03/28  [Not refereed][Not invited]
  
• 赤泥の有効利用に向けた磁選による鉄成分の濃縮およびチタン成分の存在状態

  大和田秀二, 伊藤真由美, 岡島大  資源・素材学会春季大会講演集  17-  (2)  65  -66  2005/03/28  [Not refereed][Not invited]
  
• 二成分系粉砕における各種優先破壊・単体分離モデルの比較

  大和田 秀二, 大宮 隆之, 森川 隆彦, 伊藤 真由美  春季大会講演集. I, 資源編  17-  (2)  "企画  -49"-"企画-52"  2005/03/28  [Not refereed][Not invited]
  
• 赤泥の有効利用に向けた磁選による鉄成分の濃縮およびチタン成分の存在状態

  大和田 秀二, 伊藤 真由美, 岡島 大  春季大会講演集. I, 資源編  17-  (2)  65  -66  2005/03/28  [Not refereed][Not invited]
  
• 電気パルス粉砕での単体分離促進機構に対する各種試料物性の影響 : 各種鉱物粒子分散セメント試料に関する検討

  大和田 秀二, 伊藤 真由美, 中川 剛直, 中宮 優子, 趙 祥鎬  春季大会講演集. I, 資源編  17-  (2)  67  -68  2005/03/28  [Not refereed][Not invited]
  
• 土壌中のシアンの形態

  恒川 昌美, 伊藤 真由美  春季大会講演集. I, 資源編  17-  (2)  "企画  -93"-"企画-96"  2005/03/28  [Not refereed][Not invited]
  
• キャリア浮選を用いた白色結晶質石灰石の高品位化

  恒川 昌美, 本間 佑吾, 柳 庚槿, 広吉 直樹, 伊藤 真由美  春季大会講演集. I, 資源編  17-  (2)  53  -54  2005/03/28  [Not refereed][Not invited]
  
• 低比重細粒破砕物のジグ選別における粒子流動性と最適分離条件

  恒川 昌美, 堀 邦紘, 上田 将経, 越智 大司, 広吉 直樹, 伊藤 真由美, 伊藤 正澄  春季大会講演集. I, 資源編  17-  (2)  55  -56  2005/03/28  [Not refereed][Not invited]
  
• プラスチックのジグ選別における粒子物性の影響

  恒川 昌美, 上田 将経, 堀 邦紘, 越智 大司, 広吉 直樹, 伊藤 真由美, 伊藤 正澄  春季大会講演集. I, 資源編  17-  (2)  57  -58  2005/03/28  [Not refereed][Not invited]
  
• 物理選別による廃2次電池中の有価物回収(第2報)

  恒川 昌美, 古谷 尚稔, 広吉 直樹, 伊藤 真由美, 北村 修, 市川 良二, 菊田 和幸  春季大会講演集. I, 資源編  17-  (2)  63  -64  2005/03/28  [Not refereed][Not invited]
  
• 鉛汚染土壌からの鉛分リーチングおよび鉛濃縮に関する基礎的研究

  伊藤 真由美, 久保 泰政, 広吉 直樹, 恒川 昌美  春季大会講演集. I, 資源編  17-  (2)  145  -146  2005/03/28  [Not refereed][Not invited]
  
• 再生粗骨材を用いたコンクリートの強度に及ぼす湿式選別条件の影響

  恒川 昌美, 上杉 浩平, 伊藤 真由美, 伊藤 正澄, 名和 豊春, 西田 法文, 広吉 直樹, 平島 剛  春季大会講演集. I, 資源編  17-  (2)  173  -174  2005/03/28  [Not refereed][Not invited]
  
• 低品位黒曜石の資源化

  山口英志, 恒川昌美, 広吉直樹, 伊藤真由美  資源・素材  2005-  50  2005  [Not refereed][Not invited]
  
• Leaching Cementation Separation~重金属汚染土壌の新しい修復法~

  伊藤真由美, 久保泰政, 広吉直樹, 恒川昌美  資源・素材  2005-  66  2005  [Not refereed][Not invited]
  
• ジグ選別におけるプラスチック粒子の分離挙動

  恒川昌美, 越智大司, 堀邦紘, 上田将経, 広吉直樹, 伊藤真由美, 伊藤正澄  資源・素材  2005-  55  2005  [Not refereed][Not invited]
  
• 廃プラスチックの選別技術

  伊藤真由美  資源・素材  2005-  (C/D)  73  -76  2005  [Not refereed][Not invited]
  
• プラスチックのジグ選別における表面物性の影響

  恒川昌美, 上田将経, 堀邦紘, 越智大司, 広吉直樹, 伊藤真由美, 伊藤正澄  資源・素材  2005-  56  2005  [Not refereed][Not invited]
  
• プラスチックのジグ選別―最適分離条件と粒子の流動

  堀邦紘, 恒川昌美, 上田将経, 越智大司, 広吉直樹, 伊藤真由美, 伊藤正澄  資源・素材  2005-  57  2005  [Not refereed][Not invited]
  
• ジグ選別における粒子の分離挙動と選別性の簡易評価

  恒川昌美, 越智大司, 堀邦紘, 上田将経, 広吉直樹, 伊藤真由美, 伊藤正澄  資源・素材学会北海道支部春季講演会講演要旨集  2005-  61  -62  2005  [Not refereed][Not invited]
  
• 鉛汚染土壌からの鉛分リーチングおよび鉛濃縮に関する基礎的研究

  伊藤真由美, 久保泰政, 広吉直樹, 恒川昌美  地下水・土壌汚染とその防止対策に関する研究集会講演集(CD-ROM)  11th-  ROMBUNNO.S1-18  2005  [Not refereed][Not invited]
  
• マイクロフォーカスX線CTを用いた高電圧破壊試験試料の観察について

  横田光博, ちょう祥こう, 伊藤真由美, 中宮優子, 大和田秀二, 金子勝比古  資源・素材学会北海道支部春季講演会講演要旨集  2005-  19  -20  2005  [Not refereed][Not invited]
  
• マイクロフォーカスX線CTを用いた高電圧破壊試験試料の観察について

  横田光博, ちょう祥こう, 伊藤真由美, 金子勝比古, 中宮優子, 大和田秀二  資源・素材  2005-  43  2005  [Not refereed][Not invited]
  
• The 7th International Symposium on East Asian Resources Recycling Technology (EARTH2003)

  伊藤 真由美  Journal of the Mining and Materials Processing Institute of Japan  120-  (10)  611  -614  2004/11/25  [Not refereed][Not invited]
  
• 赤泥中の鉄分の存在状態および磁選による分離・濃縮

  岡島大, 伊藤真由美, 大和田秀二  資源・素材  2004-  96  2004/09/14  [Not refereed][Not invited]
  
• 単体分離促進のための電気パルスによる選択粉砕機構の解明~石炭含有鉱物の粉砕性は何で決まるのか~

  伊藤真由美, 中川剛直, 名児耶勉, 大和田秀二  資源・素材  2004-  95  2004/09/14  [Not refereed][Not invited]
  
• 鉱物処理における新しい破砕・粉砕技術~IMPC2003粉砕に関する論文~

  伊藤真由美, 大和田秀二  資源・素材  2004-  (C/D)  173  -176  2004/09/14  [Not refereed][Not invited]
  
• 2.3.1 コールクリーニング(2.3 石炭の加工と輸送技術,2. 石炭,II エネルギー資源の利用技術の進展と研究動向,平成15年における重要なエネルギー関係項目)

  恒川 昌美, 伊藤 真由美  日本エネルギー学会誌  83-  (8)  587  -588  2004/08/20  [Not refereed][Not invited]
  
• 鉛汚染土壌の凝集・分散性および物理的洗浄方法の検討

  大和田秀二, 伊藤真由美, 鈴木寛子, 寺田尚史  地下水・土壌汚染とその防止対策に関する研究集会講演集  10th-  750  -753  2004/07  [Not refereed][Not invited]
  
• ハイパーコール製造のための脱アルカリ技術―水溶液中でNa吸着させたY型ゼオライトの再生処理と非水溶液中のNa吸着挙動―

  伊藤真由美, 白山雄一, 大和田秀二, 山下亨, 安藤隆, 篠崎貞行, 山内洋幸  資源・素材学会春季大会講演集  16-  (2)  160  -161  2004/03/29  [Not refereed][Not invited]
  
• 粉砕における連続的破壊を考慮した優先破壊・単体分離モデルの提案

  大和田秀二, 伊藤真由美, 織田竜輔, 大宮隆之  資源・素材学会春季大会講演集  16-  (2)  17  -18  2004/03/29  [Not refereed][Not invited]
  
• 解砕‐分級による汚染土壌からの重金属微粒子の除去に関する基礎的研究―重金属微粒子の存在形態把握および土粒子と重金属微粒子の分散性に及ぼす各種因子の影響―

  大和田秀二, 伊藤真由美, 鈴木寛子, 寺田尚史  資源・素材学会春季大会講演集  16-  (2)  158  -159  2004/03/29  [Not refereed][Not invited]
  
• 粉砕における連続的破壊を考慮した優先破壊・単体分離モデルの提案

  大和田 秀二, 伊藤 真由美, 織田 竜輔, 大宮 隆之  春季大会講演集. I, 資源編  16-  (2)  17  -18  2004/03/29  [Not refereed][Not invited]
  
• 解砕-分級による汚染土壌からの重金属微粒子の除去に関する基礎的研究 : 重金属微粒子の存在形態把握および土粒子と重金属微粒子の分散性に及ぼす各種因子の影響

  大和田 秀二, 伊藤 真由美, 鈴木 寛子, 寺田 尚史  春季大会講演集. I, 資源編  16-  (2)  158  -159  2004/03/29  [Not refereed][Not invited]
  
• ハイパーコール製造のための脱アルカリ技術 : 水溶液中でNa吸着させたY型ゼオライトの再生処理と非水溶液中のNa吸着挙動

  伊藤 真由美, 白山 雄一, 大和田 秀二, 山下 亨, 安藤 隆, 篠崎 貞行, 山内 洋幸  春季大会講演集. I, 資源編  16-  (2)  160  -161  2004/03/29  [Not refereed][Not invited]
  
• Removal of Alkaline and Alkaline-Earth Metals for Hyper Coal Production-Alkaline and Alkaline-Earth Metals Removal Test with Zeolite Under the High Temperatures and Pressures Conditions, and Removal Test of Dissolving Sodium in Nonpolar Solvent-

  ITO MAYUMI, OWADA SHUJI, ANDO TAKASHI, YAMASHITA TOORU, SHINOZAKI SADAYUKI, YAMAUCHI HIROYUKI  日本エネルギー学会石炭科学会議発表論文集  40th-  (40)  52  -53  2003/10/23  [Not refereed][Not invited]
   

  Direct coal injection to a gas turbine is expected as an advanced high efficiency power generation technology. "Hyper-Coal" is a fuel to the direct coal injection, and must be extremely low ash and low alkaline and alkaline-earth metals concentration. In this paper, in order to incorporate "alkaline and alkaline-earth metals removal process" into "coal solvent extraction process", the ion exchange treatment with H-Y zeolite were investigated under high temperature and pressure condition (360℃, 10atm). Agglomeration test of the zeolite and Removal Test of Dissolving Sodium in Nonpolar Solvent were also examined.
• 25. Removal of Alkaline and Alkaline-Earth Metals for Hyper Coal Production : Alkaline and Alkaline-Earth Metals Removal Test with Zeolite Under the High Temperatures and Pressures Conditions, and Removal Test of Dissolving Sodium in Nonpolar Solvent

  Ito Mayumi, Owada Syuji, Ando Takashi, Yamashita Toru, Shinozaki Sadayuki, Yamauchi Hiroyuki  石炭科学会議発表論文集  0-  (40)  52  -53  2003/10/23  [Not refereed][Not invited]
   

  Direct coal injection to a gas turbine is expected as an advanced high efficiency power generation technology. "Hyper-Coal" is a fuel to the direct coal injection, and must be extremely low ash and low alkaline and alkaline-earth metals concentration. In this paper, in order to incorporate "alkaline and alkaline-earth metals removal process" into "coal solvent extraction process", the ion exchange treatment with H-Y zeolite were investigated under high temperature and pressure condition (360℃, 10atm). Agglomeration test of the zeolite and Removal Test of Dissolving Sodium in Nonpolar Solven...
• 産地の異なる石炭の電気パルス粉砕性の比較 (その2)

  大和田秀二, 伊藤真由美, 西村威彦  資源・素材学会春季大会講演集  15-  (2)  186  -187  2003/03/27  [Not refereed][Not invited]
  
• 粉砕産物の単体分離性に及ぼす構成成分の圧縮強度およびVickers硬度の影響

  大和田秀二, 伊藤真由美, 織田竜輔  資源・素材学会春季大会講演集  15-  (2)  220  -221  2003/03/27  [Not refereed][Not invited]
  
• 産地の異なる石炭の電気パルス粉砕性の比較(その2)

  大和田 秀二, 伊藤 真由美, 西村 威彦  春季大会講演集. I, 資源編  15-  (2)  186  -187  2003/03/27  [Not refereed][Not invited]
  
• 粉砕産物の単体分離性に及ぼす構成成分の圧縮強度および Vickers 硬度の影響

  大和田 秀二, 伊藤 真由美, 織田 竜輔  春季大会講演集. I, 資源編  15-  (2)  220  -221  2003/03/27  [Not refereed][Not invited]
  
• アドバンスト・ミネラルプロセッシング技術の開発に関する調査研究

  平島剛, 広吉直樹, 恒川昌美, 大木達也, 伊藤真由美, 大和田秀二, 長岡亨  日本鉱業振興会助成研究成果報告書  2002-  65  -70  2002/11/08  [Not refereed][Not invited]
  
• Removal of Alkaline and Alkaline-Earth Metals for Hyper Coal Production. Application of Inorganic Ion-Exchange Material.

  ITO MAYUMI, ANDO TAKASHI, YAMASHITA TOORU, SHINOZAKI SADAYUKI  日本エネルギー学会石炭科学会議発表論文集  39th-  103  -104  2002/10/29  [Not refereed][Not invited]
   

  Direct coal injection to a gas turbine is expected as an advanced high efficiency power generation technology. Gas turbine blades are particularly susceptible to ash particles as they erode the blades by impinging on them as well as forming deposits that can corrode the blades at their high operating temperatures. In particular, the concentration of alkaline and alkaline-earth metals, which have great impact on the erosion and corrosion of turbine blades, must be extremely low level. In order to produce "Hyper Coal", the ion exchange treatments using inorganic ion-exchange material were investigated for removing Na, K, Ca and Mg from solvent extracted coal.
• 43. Removal of Alkaline and Alkaline-Earth Metals for Hyper Coal Production : Application of Inorganic Ion-Exchange Material

  Ito Mayumi, Ando Takashi, Yamashita Toru, Shinozaki Sadayuki  Proceedings of Conference on Coal Science  0-  (39)  103  -104  2002/10/29  [Not refereed][Not invited]
   

  Direct coal injection to a gas turbine is expected as an advanced high efficiency power generation technology. Gas turbine blades are particularly susceptible to ash particles as they erode the blades by impinging on them as well as forming deposits that can corrode the blades at their high operating temperatures. In particular, the concentration of alkaline and alkaline-earth metals, which have great impact on the erosion and corrosion of turbine blades, must be extremely low level. In order to produce "Hyper Coal", the ion exchange treatments using inorganic ion-exchange material were inv...
• アドバンスドミネラルプロセッシングと最新の資源リサイクリング技術 次世代高効率発電用新燃料の製造 ハイパーコール(完全無灰炭)製造プロジェクトの紹介

  伊藤真由美, 山下亨, 安藤隆, 篠崎貞行  資源・素材  2002-  (C/D)  65  -68  2002/09/23  [Not refereed][Not invited]
  
• 選択粉砕を目的とした電気パルス粉砕の石炭への適用

  西村威彦, 中畑慎介, 伊藤真由美, 大和田秀二  資源・素材  2002-  79  2002/09/23  [Not refereed][Not invited]
  
• ハイパーコール製造のためのイオン交換法による脱アルカリ

  伊藤真由美  資源・素材  2002-  90  2002/09/23  [Not refereed][Not invited]
  
• 第6回東アジア資源リサイクリングシンポジウム参加報告

  伊藤 真由美  資源と素材 : 資源・素材学会誌 : journal of the Mining and Materials Processing Institute of Japan  118-  (8)  574  -575  2002/08/25  [Not refereed][Not invited]
  
• 優先破壊を考慮した単体分離モデルおよびそれを用いた選別後の品位・回収率の予測

  大和田秀二, 伊藤真由美, 黒川和成  資源・素材学会春季大会講演集  14-  (2)  60  -61  2002/03/28  [Not refereed][Not invited]
  
• PET,PVCの浮選における湿潤剤のイオン性と鎖長さおよび温度の影響

  大和田秀二, 伊藤真由美, 金崎元彦  資源・素材学会春季大会講演集  14-  (2)  233  -234  2002/03/28  [Not refereed][Not invited]
  
• 産地の異なる石炭の電気パルス粉砕性の比較

  大和田秀二, 伊藤真由美, 西村威彦, 畠山信之助, 山下亨, 大木達也, 藤田豊久  資源・素材学会春季大会講演集  14-  (2)  54  -55  2002/03/28  [Not refereed][Not invited]
  
• 有機・無機イオン交換剤を用いたハイパーコール製造のための脱アルカリ技術

  伊藤真由美, 山下亨, 安藤隆, 篠崎貞行, 大和田秀二  資源・素材学会春季大会講演集  14-  (2)  56  -57  2002/03/28  [Not refereed][Not invited]
  
• 産地の異なる石炭の電気パルス粉砕性の比較

  大和田 秀二, 伊藤 真由美, 西村 威彦, 畠山 信之助, 山下 亨, 大木 達也, 藤田 豊久  春季大会講演集. I, 資源編  14-  (2)  54  -55  2002/03/28  [Not refereed][Not invited]
  
• 有機・無機イオン交換剤を用いたハイパーコール製造のための脱アルカリ技術

  伊藤 真由美, 山下 亨, 安藤 隆, 篠崎 貞行, 大和田 秀二  春季大会講演集. I, 資源編  14-  (2)  56  -57  2002/03/28  [Not refereed][Not invited]
  
• 優先破壊を考慮した単体分離モデルおよびそれを用いた選別後の品位・回収率の予測

  大和田 秀二, 伊藤 真由美, 黒川 和成  春季大会講演集. I, 資源編  14-  (2)  60  -61  2002/03/28  [Not refereed][Not invited]
  
• PET、PVCの浮選における湿潤剤のイオン性と鎖長さおよび温度の影響

  大和田 秀二, 伊藤 真由美, 金崎 元彦  春季大会講演集. I, 資源編  14-  (2)  233  -234  2002/03/28  [Not refereed][Not invited]
  
• 資源・素材2001(札幌)秋季大会記 - 平成13年度資源・素材関係学協会合同秋季大会 - かでる2・7(札幌市) 2001年9月24〜26日

  資源, 札幌実行委員会, 井上 拓, 伊藤 真由美, 草野 真樹  資源と素材 : 資源・素材学会誌 : journal of the Mining and Materials Processing Institute of Japan  117-  (11)  913  -914  2001/11/25  [Not refereed][Not invited]
  
• Removal of Alkaline and Alkaline-earth Metals for Hyper Coal Production.

  ITO MAYUMI, ANDO TAKASHI, YAMASHITA TOORU, SHINOZAKI SADAYUKI  日本エネルギー学会石炭科学会議発表論文集  38th-  239  -242  2001/11/13  [Not refereed][Not invited]
   

  Direct coal injection to a gas turbine is expected as an advanced high efficiency power generation technology. Gas turbine blades are particularly susceptible to ash particles as they erode the blades by impinging on them as well as forming deposits that can corrode the blades at their high operating temperatures. In particular, the concentration of alkaline and alkaline-earth metals, which have great impact on the erosion and corrosion of turbine blades, must be extremely low level. In order to produce "Hyper Coal", the ion exchange treatments were investigated for removing Na, K, Ca and Mg from solvent extracted coal.
• 58. Removal of Alkaline and Alkaline-earth Metals for Hyper Coal Production

  Ito Mayumi, Ando Takashi, Yamashita Toru, Shinozaki Sadayuki  Proceedings of Conference on Coal Science  0-  (38)  239  -242  2001/11/13  [Not refereed][Not invited]
   

  Direct coal injection to a gas turbine is expected as an advanced high efficiency power generation technology. Gas turbine blades are particularly susceptible to ash particles as they erode the blades by impinging on them as well as forming deposits that can corrode the blades at their high operating temperatures. In particular, the concentration of alkaline and alkaline-earth metals, which have great impact on the erosion and corrosion of turbine blades, must be extremely low level. In order to produce "Hyper Coal", the ion exchange treatments were investigated for removing Na, K, Ca and M...
• 早稲田大学・大和田研究室 研究紹介 : 早稲田大学理工学部 環境資源工学科 資源循環工学分野

  伊藤 真由美, 大和田 秀二  資源・素材  2001-  (0)  23  -23  2001/09/24  [Not refereed][Not invited]
  
• 電気パルス粉砕の石炭への適応

  西村 威彦, 畠山 信之助, 伊藤 真由美, 大和田 秀二  資源・素材  2001-  (0)  25  -25  2001/09/24  [Not refereed][Not invited]
  
• エアテーブルを用いた細粒石炭の乾式選別

  山下亨, 伊藤真由美, 大井英節, 石田徹  資源・素材学会春季大会講演集  (2)  123  -124  2001/03/29  [Not refereed][Not invited]
  
• 電気パルス粉砕による石炭の集合粉砕

  大和田秀二, 太田智絵, 西村威彦, 伊藤真由美, 小野重好, 山下亨, 大木達也, 藤田豊久  資源・素材学会春季大会講演集  (2)  109  -110  2001/03/29  [Not refereed][Not invited]
  
• 電気パルス粉砕による石炭の集合粉砕

  大和田 秀二, 太田 知絵, 西村 威彦, 伊藤 真由美, 小野 重好, 山下 亨, 大木 達也, 藤田 豊久  一般発表(研究・業績発表)講演要旨集  2001-  (2)  109  -110  2001/03/01  [Not refereed][Not invited]
  
• エアテーブルを用いた細粒石炭の乾式選別

  山下 亨, 伊藤 真由美, 大井 英節, 石田 徹  一般発表(研究・業績発表)講演要旨集  2001-  (2)  123  -124  2001/03/01  [Not refereed][Not invited]
  
• Removal of alkaline and alkaline earth metals from coal.

  ONO SHIGEYOSHI, YAMASHITA TOORU, ITO MAYUMI, OWADA SHUJI, SHINOZAKI SADAYUKI  日本エネルギー学会石炭科学会議発表論文集  37th-  97  -100  2000/09/28  [Not refereed][Not invited]
   

  Direct coal injection to a gas turbine is expected as an advanced high efficiency power generation technology. In this case, feed coal must be ash-free and alkaline and alkaline earth metal-free to prevent erosion and corrosion of turbine blade. In this study, ion exchange treatment of coal was investigated to remove Na, K, Ca and Mg.
• 23. Removal of alkaline and alkaline earth metals from coal

  Ono Sigeyoshi, Yamashita Toru, Ito Mayumi, Owada Shuji, Shinozaki Sadayuki  Proceedings of Conference on Coal Science  0-  (37)  97  -100  2000/09/28  [Not refereed][Not invited]
   

  Direct coal injection to a gas turbine is expected as an advanced high efficiency power generation technology. In this case, feed coal must be ash-free and alkaline and alkaline earth metal-free to prevent erosion and corrosion of turbine blade. In this study, ion exchange treatment of coal was investigated to remove Na, K, Ca and Mg.
• 高硫黄石炭ずり浸出水の水質制御に関する基礎的研究

  伊藤真由美, 山田龍一, 恒川昌美, 平島剛, 広吉直樹  資源・素材学会春季大会講演集  (2)  17  1999/03/29  [Not refereed][Not invited]
  
• 石炭の脱硫浮選に関する基礎的研究 (第3報)

  伊藤真由美, 湯川健太郎, 恒川昌美, 平島剛, 広吉直樹  資源・素材学会春季大会講演集  (2)  18  1999/03/29  [Not refereed][Not invited]
  
• 石炭浮選における脱灰性評価法

  恒川 昌美, 今 行忠, 平島 剛, 広吉 直樹, 伊藤 真由美  一般発表(研究・業績発表)講演要旨集  1997-  (1)  186  -186  1999/03/25  [Not refereed][Not invited]
  
• 石炭の脱流浮選に関する基礎的研究

  伊藤 真由美, 恒川 昌美, 平島 剛, 広吉 直樹  一般発表(研究・業績発表)講演要旨集  1997-  (1)  187  -187  1999/03/25  [Not refereed][Not invited]
  
• 高硫黄石炭ずり浸出水の水質制御に関する基礎的研究

  伊藤 真由美, 山田 龍一, 恒川 昌美, 平島 剛, 広吉 直樹  一般発表(研究・業績発表)講演要旨集  1999-  (2)  17  -17  1999/03/01  [Not refereed][Not invited]
  
• 石炭の脱硫浮選に関する基礎的研究(第3報)

  伊藤 真由美, 湯川 健太郎, 恒川 昌美, 平島 剛, 広吉 直樹  一般発表(研究・業績発表)講演要旨集  1999-  (2)  18  -18  1999/03/01  [Not refereed][Not invited]
  
• 石炭の脱硫浮選に関する基礎的研究 (第2報)

  伊藤真由美, 恒川昌美, 平島剛, 広吉直樹  資源・素材学会春季大会講演集  21  1998/03  [Not refereed][Not invited]
  
• 微粉炭浮選における脱灰性の評価と鉱物質単体分離度の推定

  恒川昌美, 今行忠, 伊藤真由美, 平島剛, 広吉直樹  資源・素材学会春季大会講演集  22  1998/03  [Not refereed][Not invited]
  
• 石炭の脱硫浮選に関する基礎的研究(第2報)

  伊藤 真由美, 恒川 昌美, 平島 剛, 広吉 直樹  一般発表(研究・業績発表)講演要旨集  1998-  (2)  21  -21  1998/03/01  [Not refereed][Not invited]
  
• 微粉炭浮選における脱灰性の評価と鉱物質単体分離度の推定

  恒川 昌美, 今 行忠, 伊藤 真由美, 平島 剛, 広吉 直樹  一般発表(研究・業績発表)講演要旨集  1998-  (2)  22  -22  1998/03/01  [Not refereed][Not invited]
  
• Desulfurization flotation of imaginary high sulfur coal using the ferruginous solution.

  ITO MAYUMI, YUKAWA KENTARO, TSUNEKAWA MASAMI, HIRASHIMA TSUYOSHI, HIROYOSHI NAOKI  資源・素材学会北海道支部春季講演会講演要旨集  1998-  15  -16  1998  [Not refereed][Not invited]
  
• Basic research on property control of the leach from high sulfur coal.

  ITO MAYUMI, YAMADA RYUICHI, TSUNEKAWA MASAMI, HIRASHIMA TSUYOSHI, HIROYOSHI NAOKI  資源・素材学会北海道支部春季講演会講演要旨集  1998-  17  -18  1998  [Not refereed][Not invited]
  
• Basic research on the desulfurization flotation of coal.

  ITO MAYUMI, TSUNEKAWA MASAMI, HIRAJIMA TSUYOSHI, HIROYOSHI NAOKI  資源・素材学会研究・業績発表講演会講演要旨集  1997-  187  1997/03  [Not refereed][Not invited]
  
• Deashing ability evaluation method in coal flotation.

  TSUNEKAWA MASAMI, IMAYUKI TADASHI, HIRAJIMA TSUYOSHI, HIROYOSHI NAOKI, ITO MAYUMI  資源・素材学会研究・業績発表講演会講演要旨集  1997-  186  1997/03  [Not refereed][Not invited]
  
• Mineral Bioprocessingへの挑戦〜北大・鉱物処理工学研究室における最近の研究〜

  伊藤 真由美, 恒川 昌美, 平島 剛, 広吉 直樹, 笹木 圭子  資源・素材  1996-  (1)  67  -67  1996/10/21  [Not refereed][Not invited]
  
• 強酸性領域における黄鉄鉱の浮選挙動

  伊藤 真由美, 広吉 直樹, 恒川 昌美, 平島 剛  一般発表(研究・業績発表)講演要旨集  1996-  (1)  153  -153  1996/03/29  [Not refereed][Not invited]
  
• Flotation behavior of pyrite in a strong acidity region.

  ITO MAYUMI, HIROYOSHI NAOKI, TSUNEKAWA MASAMI, HIRAJIMA TSUYOSHI  資源・素材学会研究・業績発表講演会講演要旨集  1996-  153  1996/03  [Not refereed][Not invited]
  
• Feed grain size and limitative ash content in coal flotation.

  TSUNEKAWA MASAMI, KON YUKITADA, HIRAJIMA TSUYOSHI, ITO MAYUMI, HIROYOSHI NAOKI  資源・素材学会北海道支部春季講演会講演要旨集  1996-  5  -6  1996  [Not refereed][Not invited]
  
• 鉄酸化細菌の増殖挙動の簡便測定法とその応用 : ポリオキシエチレン化合物存在下での増殖挙動の把握

  広吉 直樹, 伊藤 真由美, 恒川 昌美, 平島 剛  一般発表(研究・業績発表)講演要旨集  1995-  (1)  33  -33  1995/03/28  [Not refereed][Not invited]
  
• 鉄酸化細菌の増殖挙動の簡便測定法とその応用 ポリオキシエチレン化合物存在下での増殖挙動の把握

  広吉直樹, 伊藤真由美, 恒川昌美, 平島剛  資源・素材学会研究・業績発表講演会講演要旨集  1995-  33  1995/03  [Not refereed][Not invited]
  
• 鉄酸化細菌の簡便な増殖測定法

  広吉直樹, 伊藤真由美, 恒川昌美, 平島剛  資源・素材学会北海道支部春季講演会講演要旨集  1994-  3  -4  1994  [Not refereed][Not invited]
  
• Comparison of the suppressive effect of ferric- and ferrous-catechol complexes on pyrite oxidation

  X. Li, N. Hiroyoshi, K. Naruwa, M. Ito, C.B. Tabelin  Proceedings of International Symposium on Earth Science and Technology  605  -607  [Not refereed][Not invited]
  

Books etc

• プラスチックのケミカルリサイクル技術

  監修 吉岡敏明 (Contributor第III編 湿式法 ＜選別＞ 比重選別および浮遊選別)
  シーエムシー出版 2021/09
• バリューチェーンと単位操作から見たリサイクル

  化学工学会, 環境部会リサイクル分科会著 (Contributor第2章技術編 2.1.2物理選別)
  三恵社 2020/12
• 海底鉱物資源の産業利用

  伊藤 真由美 (Contributor96-112)
  シーエムシー出版，東京 2013

Association Memberships

• THE JAPAN INSTITUTE OF ENERGY   JAPAN SOCIETY OF MATERIAL CYCLES AND WASTE MANAGEMENT   THE RESOURCES PROCESSING SOCIETY OF JAPAN   THE MINING AND MATERIALS PROCESSING INSTITUTE OF JAPAN   

Research Projects

• 銅精鉱の安定供給に向けた難処理銅鉱石のカスタマイズ処理条件を提示するプロトコ ールの策定

  (独）石油天然ガス・金属鉱物資源機構：金属資源の生産技術に関する基礎研究

  Date (from‐to) : 2022/06 -2023/03 

  Author : 伊藤真由美, パク イルファン
• 銅亜鉛分離浮選における亜鉛鉱物抑制機構の解明のための基礎研究」/閃亜鉛鉱の浮遊性に及ぼす各種因子の影響把握と，閃亜鉛鉱と銅鉱物の浮選速度差の増大のための手法の開発

  (独）石油天然ガス・金属鉱物資源機構：金属資源の生産技術に関する基礎研究

  Date (from‐to) : 2021/06 -2022/03 

  Author : 伊藤真由美, パク イルファン
• ザンビア鉱山地区における鉛汚染環境および鉛中毒対策としてのリスクベースアプローチの実践と効果検証

  JST：Axis

  Date (from‐to) : 2020/04 -2022/03 

  Author : 研究代表者, 石塚真由美
• ザンビアにおける鉛汚染のメカニズムの解明と健康・経済リスク評価手法および予防・修復技術の開発

  JICA-JST：SATREPS

  Date (from‐to) : 2015/06 -2022/03 

  Author : 研究代表者, 石塚真由美
• 銅亜鉛分離浮選における亜鉛鉱物抑制機構の解明のための基礎研究」/閃亜鉛鉱の浮遊性に及ぼす各種因子の影響把握と，閃亜鉛鉱と銅鉱物の浮選速度差の増大のための手法の開発

  (独）石油天然ガス・金属鉱物資源機構：金属資源の生産技術に関する基礎研究

  Date (from‐to) : 2020/06 -2021/03 

  Author : 伊藤真由美
• New development on carrier micro-encapsulation for prevending acid mine drainage formation

  Japan Society for the Promotion of Science：Grants-in-Aid for Scientific Research

  Date (from‐to) : 2017/04 -2020/03 

  Author : Hiroyoshi Naoki

   

  Carrier micro-encapsulation (CME) was studied as a new method to suppress oxidative dissolution of pyrite, causing the formation of acid mine drainage. A novel technique of CME using Fe or Al ions, which are easy to be obtained at mine site, was proposed and its suppressive effects on pyrite dissolution was confirmed based on electrochemical studies and surface analysis. When Ti and Fe-catecholate complexes coexisted, a high acid resistant protective coating was formed on pyrite surface, and it suppressed cathodic reduction of oxygen on the mineral surface and pyrite oxidation.
• Selective recovery of precious metals from solution using magnetite

  Japan Society for the Promotion of Science：Grants-in-Aid for Scientific Research

  Date (from‐to) : 2011/04 -2014/03 

  Author : HIROYOSHI Naoki, ITO Mayumi, FUKUSHIMA Masami

   

  A new method to recover precious metals like gold and platinum group metals selectively from the solutions containing common metal ions. Reduction potential of the precious metal ions are high and they are reduced and precipitated on magnetite surface, but reduction potential of common metals like copper and zinc are lower than that of magnetite and they are not reduced on magnetite surface. Magnetic separation can be used to recover precious metal loaded magnetite from the suspension of precious metal ores and scraps. It was confirmed that slag magnetite (a magnetic portion of crushed copper converter slag) can be used to recover precious metals.
• Self-sealability of fractures in rock and its application to fracture and strength control

  Japan Society for the Promotion of Science：Grants-in-Aid for Scientific Research

  Date (from‐to) : 2010 -2012 

  Author : KANEKO Katsuhiko, KAWASAKI Satoru, NARA Yoshitaka, ITO Mayumi, MUKUNOKI Toshifumi, HIROYOSHI Naoki, SAKAGUCHI Kiyotoshi, HARADA Syusaku

   

  A series of experimental studies on the sealability of fracture has been performed and its application to geotechnical engineering has been discussed. Firstly, analyzing the influence of environments on the sub-critical crack growth in rock, the mechanism of crack growth has been clarified. Secondarily, the self-sealing process of fracture in the rocklike material in water was investigated and the mechanism of self-sealing was clarified. Thirdly, the process of fracture propagation was analyzed numerically and a design method to control fracture propagation, i.e., crack orientation and so on. From these results, a method to estimate the long-term strength of rock has been proposed. Furthermore it is pointed out that the strength of rock can be controlled by controlling the environmental condition.
• Advanced jig separation technology for resource recycling and wettability control of plastics

  Japan Society for the Promotion of Science：Grants-in-Aid for Scientific Research

  Date (from‐to) : 2011 -2011 

  Author : ITO Mayumi, HIROYOSHI Naoki

   

  Industrial systems and daily life in Japan are shifting to a society based on recycling to reduce energy and resource consumption and efficient separation technology of valuable component from used products is important. The authors have developed the RETAC jig (a modified TACUB jig) and the RETAC jig can separate relatively low density particles such as plastics. To further improve the separation ability, a hybrid jig (a RETAC jig with an air bubbler under the particle bed), which can separate plastics having similar specific gravities by the differences in the wettabilities of the particles was developed. Surface modification of plastics with similar wettability enabling separation in the hybrid jig and precise control of the wettability of plastic surfaces are investigated. Effect of bubble size on apparent density of particles was also investigated and recovery system of floating and suspending particles was developed.
• Mineral processing of deep sea resources

  Ministry of Education, Culture, Sports, Science and Technology：Grants-in-Aid for Scientific Research(若手研究(B))

  Date (from‐to) : 2008 -2010 

  Author : Mayumi ITO

   

  Cobalt-rich ferromanganese crust/nodules are unused resources where the commercial potential will depend on trends in mining and treatment costs of onshore mines. In this study physical separation methods to concentrate valuable components from the substrate rocks were investigated. Liberation ratios of crushed products were measured and separation of fine fraction was carried out using RETAC jig and advanced jig. Treatment flow chart of cobalt-rich ferromanganese crust/nodules was proposed.
• Application of carrier-microencapsulation for coal flotation to remove pyrite and to suppress acid mine drainage formation at tailing dam

  Ministry of Education, Culture, Sports, Science and Technology：Grants-in-Aid for Scientific Research(基盤研究(B))

  Date (from‐to) : 2008 -2010 

  Author : Naoki HIROYOSHI, Masami TSUNEKAWA, Mayumi ITO, Toshifumi IGARASHI, Masami FUKUSHIMA

   

  Pyrite associated with coal generates SOx causing acid rain during coal combustion. In coal preparation, pyrite is rejected as a gangue mineral using the physical separation technique such as froth flotation and wasted into tailing pond. In the froth flotation, pyrite is frequently entrapped in froth together with valuable mineral due to its hydrophobic nature. Formation of acid mine drainage due to the air-oxidation of pyrite in tailing pond is also a serious problem. In the present study, carrier-microencapsulation (CME) is proposed to suppress both the floatability and oxidation of pyrit...
• 分けるのは訳ないリサイクル用ハイパー比重選別機の開発

  文部科学省：科学研究費補助金(挑戦的萌芽研究)

  Date (from‐to) : 2009 -2009 

  Author : 恒川 昌美, 廣吉 直樹, 伊藤 真由美

   

  研究代表者および分担者らの研究室で開発した網下気室型湿式比重選別機(TACUB JIG)をベースにして,より選別効率の高い比重選別機の開発に取り組み,以下に述べる3タイプの新しい比重選別機を開発した。1)TACUB JIGのフィード部および産物回収部に改良を加え,さらに制御法を工夫して,廃棄物の資源化・リサイクルに適した比重選別機(RETAC JIG)を開発し,種々のプラスチックを素材別に選別することを可能にした。2)このRETAC JIGをベースにして,比重差が無くても濡れ性に差があれば比重選別できるHybrid JIGを開発した。この選別機では,気泡を導入して,より疎水性の粒子表面に微細気泡を選択的に付着させることで,その見かけ比重を小さくして,物質間に見かけ比重差を生じさせて,比重分離する。このJIGにより,比重の同じプラスチックの相互選別が可能になった。3)水より軽い物質相互を分離するため,RETAC JIGの選別槽上部に天網を設置し,この天網の下にフィードして上下に脈動を与えることで,天網下部に比重別に産物を成層させて選別できるREVERSE JIGを開発した。4)上述の新たに開発した3タイプの比重選別機をあわせてAdvanced JIGと総称し,本Advanced JIGを組み合わせることで廃家電リサイクルプラントから排出されるプラスチックを素材別に選別して,マテ...
• Study on Micro-Restructuring of Rocklike Materials

  Ministry of Education, Culture, Sports, Science and Technology：Grants-in-Aid for Scientific Research(基盤研究(A))

  Date (from‐to) : 2007 -2009 

  Author : Katsuhiko KANEKO, Hiroshi TAKAHASHI, Toshifumi IGARASHI, Tsutomu SATO, Sumihiko MURATA, Satoru KAWASAKI, Mayumi ITO

   

  A series of experimental studies for the micro-restructuring of rocklike materials has been carried out. Various techniques to improve the physical properties of rocklike materials by reconstructing their microstructures have been developed, i.e., a method to change the rock strength by controlling of micro-cracking, a grout technique using microorganisms, a sealing technique using mineral separation from the ground water and so on.
• 生分解性錯体と易分離性媒体を用いたアースコンシャス汚染土壌浄化

  文部科学省：科学研究費補助金(若手研究(B))

  Date (from‐to) : 2005 -2007 

  Author : 伊藤 真由美

   

  現在,日本で行われている重金属汚染土の物理洗浄法(物理選別)は,欧米方式をそのまま採用しているが,この方法では重金属微粒子と土微粒子の物理選別ができないため,微粒群は全量,最終処分対象となり,微粒土の割合が欧米に比べて高い日本では,最終処分する微粒土が多量に発生するという問題が生じている。そこで本研究では,限られた形態の重金属しか除去できなかった既存の処理法に化学的前処理を融合させ,重金属の存在形態の転換を図ることで各種形態の重金属の物理選別を可能にする土壌処理プロセスを考案し,検討している。具体的には1)環境中で容易に分解する錯体を用いて重金属を可溶化し,2)可溶化した重金属を媒体表面にセメンテーションの原理を利用して選択濃縮し,3)この重金属が濃縮した媒体を物理選別で精度よく分離・除去する方法の開発を目的としている。本年度は最終年度である。初年度は「模擬試料を用いた各工程の個別試験」を行い,2年度は「実汚染土壌を用いた処理試験」を行なった。最終年度(本年度)は,実汚染土壌の処理に際しての処理条件の最適化および処理を阻害する因子の検討を行い,考案した処理手法の有用性を確かめることができた。以上のように,おおよそ研究実施計画通りに研究を順調に進めることができた。
• Advanced Heap-leaching for Chalcopyrite

  Ministry of Education, Culture, Sports, Science and Technology：Grants-in-Aid for Scientific Research(基盤研究(B))

  Date (from‐to) : 2005 -2007 

  Author : Naoki HIROYOSHI, 恒川 昌美, 米田 哲朗, 伊藤 真由美

   

  Heap-leaching has become important in copper production: over 20% of copper in the world is now produced at open pit mines of porphyry copper deposits through this method. In this method, copper in low-grade oxide and secondary sulfide ores is extracted into sulfuric acid solutions, and the extracted copper is recovered by solvent-extraction and electro-winning methods. However, the leaching rate of chalcopyrite (CuFeS_2), a major copper mineral in the deepest parts of the deposits, is very slow, and the development of advanced heap-leaching methods for this mineral is an object for copper ...
• 有機・無機複合廃棄物のハイパー解砕・資源化技術の開発

  文部科学省：科学研究費補助金(萌芽研究)

  Date (from‐to) : 2005 -2007 

  Author : 恒川 昌美, 柳 庚槿, 廣吉 直樹, 伊藤 真由美, 米田 哲朗, 吉田 豊

   

  循環型社会を構築していくうえで鍵を握るのは,都市域における廃棄物の資源化・リサイクル技術および環境保全技術の開発である。我々は,廃自動車や廃家電・OA機器類の資源化技術を開発してきている。この開発過程で,現状の処理プロセスでは解砕・破砕が主として減容化を目的に行われているため,その後の有価物選別・回収の段階で低い選別精度,回収率にとどまること,解砕・破砕時に発生するシュレッダーダストの軽比重物(例えばウレタンなど)に絡み込んでいる有価物が十分に回収できないことを見出した。そこで種々の有機・無機複合廃棄物を効率的に資源化・リサイクルする立場から,解砕・破砕,選別を合理的に行うための要素技術の開発研究に取り組んだ。最終年度にあたる19年度は,下記のような検討を行い,有用な知見を得た。1)二つの使用済み自動車のシュレーダーダストを対象に,破砕後に種々の風力分級をして,産物について化学分析,灰分測定,組成解析などを行った。その結果,サーマルリサイクルに適した,ウレタンなどの可燃分からなる産物を回収できるプロセスの条件を明らかにした。2)ウレタン類に鉄・銅・アルミニウムなどの金属類,繊維などが絡まっている場合は,ある種の界面活性剤溶液に浸漬することで,有価金属類を分離回収できることを見出した。3)17〜19年度の成果を踏まえ,各種有機・無機複合廃棄物に対する適切な破砕・解砕法と有価物回...
• Development of Urban Mines as Urban Resource Recovery Centers to Utilize Solid Waste and Create a Holonic Path for a Sustainable Society

  Ministry of Education, Culture, Sports, Science and Technology：Grants-in-Aid for Scientific Research(基盤研究(A))

  Date (from‐to) : 2004 -2007 

  Author : Masami TSUNEKAWA, 廣吉 直樹, 伊藤 真由美, 米田 哲朗, 名和 豊春, 平島 剛

   

  Industrial systems and daily life in Japan are shifting to become recycling-based to reduce energy and resource consumption. To establish a society based on recycling, urban resource recovery centers (urban mines) are important as places to reduce waste volumes, reusing and recycling valuable materials with application of mineral processing technology. The authors have studied advanced mineral processing technology for urban mines, and have developed new processes as described below. Based on these results, the creation of a holonic path in a sustainable society is discussed and proposed.1)...
• Quality Improvement of Pyrolysis Char Derived From Various Kind of Solid Waste for Recycling

  Ministry of Education, Culture, Sports, Science and Technology：Grants-in-Aid for Scientific Research(基盤研究(B))

  Date (from‐to) : 2005 -2006 

  Author : 田中 信壽, Toshihiko MATSUTO, 東條 安匡, 恒川 昌美, 広吉 直樹, 伊藤 真由美, 角田 芳忠

   

  In this study, sixteen kinds of char obtained from various sources including industrial waste were used for experiments. In order to use char as fuel, chlorine level should be reduced to avoid corrosion. Chlorine in char derived from MSW was characterized in terms of solubility. CO2 bubbling could reduce chorine to acceptable level for cement kiln use. Pulverization was proven to be ineffective in the dissolution of non water-soluble chlorine.Ash content is another fraction which should be lowered for fuel use of char. Ash rich fraction (r<125 um) was subjected to float-sink separation, fro...
• キャリアマイクロエンカプセレーション 〜鉱山汚濁水発生防止のための新しい方法〜

  文部科学省：科学研究費補助金(萌芽研究)

  Date (from‐to) : 2005 -2006 

  Author : 廣吉 直樹, 恒川 昌美, 伊藤 真由美

   

  本研究では,鉱山酸性汚濁水の発生を防止する新しい方法としてキャリアマイクロエンカプセレーション(Carrier Micro Encapsulation, CME)を提案する.本法では,地殻中に存在するTiO_2などの鉱物中のTiを有機キャリアで水に可溶化して,汚染源となる黄鉄鉱FeS_2などの表面に吸着させた後,キャリアを分解して化学的に安定なTiO_2薄膜で汚染源を被覆し,水や空気から遮蔽する.昨年度の結果に基づき,Tiとの錯体形成能力や酸化分解性に優れたカテコール(1,2-dihydroxybenzene, C_6H_4(OH)_2)をキャリアとして選択し,黄鉄鉱粉末(粒子径53〜75μm)の溶解に対するCMEの効果を振盪フラスコ法によるモデル実験で調べた.実験は天然Ti鉱物の代替物として試薬アナターゼ(TiO_2)5kg/Lを用いて,黄鉄鉱-溶液比0.6kg/L,温度25℃,大気下で行った。CMEを施した実験(カテコールとTiO_2を添加した実験)では,黄鉄鉱表面にTiO_2あるいはTi(OH)_2の被膜が形成され、対照実験(カテコールとTiO_2の双方あるいは一方を添加しなかった実験)に比べて黄鉄鉱の溶解量(硫酸とFeの溶出量)が少なくなり,pHの低下が緩和された.黄鉄鉱溶解に対するCMEの抑制作用は,カテコール添加濃度0.01kmol m^<-3>以上,pH4〜7の...

Industrial Property Rights

• 特開2019-42612:選鉱方法  2019/03/22

  廣吉 直樹, 伊藤 真由美, カリート タベリン, ホーン ボシー, ⼭澤 亮介, 今泉 有⼆, ⿊岩 樹⼈, 牧 昌史  国⽴⼤学法⼈北海道⼤学, 住友⾦属鉱⼭株式会社
• 特開2013-155416:黄銅鉱を含む硫化銅鉱からの銅の浸出方法  2013/08/15

  岡本 秀征, 廣吉 直樹, 伊藤 真由美, 伊藤 正樹  住友金属鉱山株式会社, 国⽴⼤学法⼈北海道⼤学
• 特願2012-67382:砒素吸着剤およびこれを用いた砒素の固定化方法  2012年/03/23

  廣吉 直樹, 佐藤 勉, 伊藤 真由美, 河合 崇泰, 岡本 秀征, 澤⽥ 満  住友⾦属鉱⼭株式会社, 国⽴⼤学法⼈北海道⼤学
• 特開2012-001747:銅製錬スラグを原料とする貴金属吸着材およびその製法  2012/01/05

  廣吉 直樹, 恒川 昌美, 伊藤 真由美, リチャード, ディアズ アロロ, 雉子谷 東, 岡本 秀征, 越智 大司, 高橋 佳久  国立大学法人北海道大学, 住友金属鉱山株式会社  201203002130335334
• 特許第4693095号:高品位結晶質石灰石及びその製造方法  2011/03/04

  恒川 昌美, 伊藤 真由美, 広吉 直樹, 本間 佑吾, 岡田 信三, 大川 滋之  太平洋セメント株式会社, 国立大学法人北海道大学  200903060267763303
• 特開2009-096869:ポリ塩化ビニル材料から鉛化合物等の無機物を除去する方法  2009/05/07

  恒川 昌美, 広吉 直樹, 伊藤 真由美, 佐々木 勇太, 中村 孔亮, 反町 正美, 渡辺 清  国立大学法人 北海道大学, 日立電線株式会社  200903028868825828
• 特開2009-096870:ポリ塩化ビニル材料から鉛化合物等の無機物を除去する方法  2009/05/07

  恒川 昌美, 広吉 直樹, 伊藤 真由美, 佐々木 勇太, 中村 孔亮, 反町 正美, 渡辺 清  国立大学法人 北海道大学, 日立電線株式会社  200903074379577953
• 特開2008-149305:シュレッダーダスト(ASR)の解砕処理方法  2008/07/03

  恒川 昌美, 伊藤 真由美, 富岡 祐一, 堀 邦紘, 桑山 豊, 赤塚 真依子, 多屋 貞男, 北山 茂一  株式会社アールアンドイー, 株式会社伸生, 国立大学法人 北海道大学  200903088888510540
• 特開2006-320881:脈動波形の制御方法を備えた湿式比重選別機  2006/11/30

  伊藤 正澄, 恒川 昌美, 広吉 直樹, 伊藤 真由美, 堀 邦紘  国立大学法人 北海道大学  200903041898742419
• 特開2006-320882:選択湿式比重選別機  2006/11/30

  伊藤 正澄, 恒川 昌美, 広吉 直樹, 伊藤 真由美, 堀 邦紘, 上田 将経  国立大学法人 北海道大学  200903092285837658