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Park Ilhwan

Faculty of Engineering　Sustainable Resources Engineering　Resources EngineeringAssociate Professor

Researcher basic information

■ Degree
  • PhD, Hokkaido University, Mar. 2019
■ URL
researchmap URL■ Various IDs
J-Global ID■ Research Keywords and Fields
Research Keyword
  • Environmental Remediation
  • Resources Recycling
  • Extractive Metallurgy
  • Mineral Processing
Research Field
  • Others, Others
■ Educational Organization

Career

■ Career
Career
  • Apr. 2023 - Present
    Hokkaido University, Division of Sustainable Resources Engineering, Faculty of Engineering, Associate Professor
  • Apr. 2019 - Mar. 2023
    Hokkaido University, Division of Sustainable Resources Engineering, Faculty of Engineering, Assistant Professor
Educational Background
  • Apr. 2016 - Mar. 2019, Hokkaido University, Division of Sustainable Resources Engineering, Japan
  • Mar. 2014 - Feb. 2016, Korea Maritime & Ocean University, Department of Ocean Energy & Resources Engineering, Korea, Republic of
  • Mar. 2008 - Feb. 2014, Korea Maritime & Ocean University, Department of Energy and Resources Engineering, Korea, Republic of

Research activity information

■ Awards
  • Feb. 2024, Hokkaido University, Hokkaido University President's Award for Outstanding Research
    Ilhwan Park
  • Mar. 2023, The Mining and Materials Institute of Japan (MMIJ), Best Paper Award
    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, 29314731
  • Mar. 2022, Faculty of Engineering, Hokkaido University, Young Faculty Award
    Ilhwan Park
  • 2018, 17th Global Joint Seminar on Geo-Environmental Engineering, Japan, Best Presentation Award (2nd place)
    Suppression of the release of arsenic from arsenopyrite by titanium- and aluminum-based carrier-microencapsulation
    Ilhwan Park
  • 2017, 1st International KAMPAI Symposium, Japan, Best Presentation Award
    uppressive effects of aluminum-catechol complexes on the release of arsenic from arsenopyrite
    Ilhwan Park
  • 2017, The Mining and Materials Processing Institute of Japan (MMIJ), Japan, MMIJ Young Poster Award
    Carrier-microencapsulation using Al-catechol complex for suppressing arsenic release from arsenopyrite
    Ilhwan Park
  • 2016, 5th International Doctoral Symposium, Japan, Best Presentation Award
    The Influence of Aluminum-Catechol Complexes on the Suppression of Arsenopyrite Oxidation
    Ilhwan Park
  • 2016, 9th AUN/SEED-Net Regional Conference on Geological and Geo-resources Engineering, Thailand, Best Presentation Award
    Suppression of Arsenopyrite Oxidation by Carrier Microencapsulation using Titanium-Catechol Complex
    Ilhwan Park
  • 2015, The Korean Institute of Metals and Materials, Korea, Best Poster Presentation Award
    The Leaching Behavior of Cuprous Oxide Powder in Sulfuric Acid
    Ilhwan Park
  • Feb. 2014, The Korean Institute of Resources Recycling, Korea, The President's Award
    Ilhwan Park
  • Dec. 2013, Federation of Busan Science and Technology, Korea, Busan Future Scientist Award (3rd place)
    The Selective Leaching of Nd from Waste Magnet using Mechanochemical Decomposition
    Ilhwan Park
■ Papers
  • The Conservation of Architectural Heritage Structures Built with Tuff and Coral Rock: A Systematic Review and Bibliometric Analysis of Geopolymer Formulation, Application, Compatibility and Durability
    Kent Benedict Aleonar Salisid; Raul Lucero, Jr.; Reymarvelos Oros; Mylah Villacorte-Tabelin; Theerayut Phengsaart; Shengguo Xue; Jiaqing Zeng; Ivy Corazon A. Mangaya-ay; Takahiko Arima; Ilhwan Park; Mayumi Ito; Sanghee Jeon; Carlito Baltazar Tabelin
    Minerals, 20 Apr. 2026
    Scientific journal
  • Toward Achieving a Carbon-Neutral Society: Beneficiation and Extractive Metallurgy for Producing Critical Metals from Ores/Wastes
    Ilhwan Park; Sanghee Jeon
    Metals, 19 Jan. 2026
    Scientific journal
  • SYNERGISTIC EFFECTS OF DOLOMITE, TALC, AND CHICKEN EGGSHELL ADDITIVES ON CHAR FORMATION AND THERMAL STABILITY OF APP–MEL–EG INTUMESCENT COATING SYSTEM FOR STEEL PROTECTION
    Edrhea Villas; Gevelyn Itao; Vannie Joy Resabal; Carlito Baltazar Tabelin; Takahiko Arima; Mayumi Ito; Naoki Hiroyoshi; Yogarajah Elakneswaran; Mylah Villacorte-Tabelin; Jaypee Yongco; michelle jeanne caracut; Arnold A. Lubguban; Joshua B. Zoleta
    2026
  • Repurposing of scrap aluminum for aluminum-iron bimetallic material synthesis and its application for metal recovery from simulated acid mine drainage
    Dayle Tranz Daño; Carlito Baltazar Tabelin; Takahiko Arima; Mayumi Ito; Naoki Hiroyoshi; Mylah Villacorte-Tabelin; Joshua B. Zoleta; Theerayut Phengsaart; Aileen H. Orbecido; Arnel Beltran; Michael Promentilla; Ronben Baute; Charmaine Garridos; Vannie Joy Resabal
    2026
  • Heavy Metal Pollution Assessment and Survey of Rhizosphere Bacterial Communities from Saccharum spontaneum L. in a Rehabilitated Nickel-Laterite Mine in the Philippines
    Shiela W. Mainit; Carlito Baltazar Tabelin; Florifern C. Paglinawan; Jaime Q. Guihawan; Alissa Jane S. Mondejar; Vannie Joy T. Resabal; Maria Reina Suzette B. Madamba; Dennis Alonzo; Aileen H. Orbecido; Michael Angelo Promentilla; Joshua B. Zoleta; Dayle Tranz Daño; Ilhwan Park; Mayumi Ito; Takahiko Arima; Theerayut Phengsaart; Mylah Villacorte-Tabelin
    Minerals, Aug. 2025
    Scientific journal
  • Recovery of Fine Rare Earth Minerals from Simulated Tin Tailings by Carrier Magnetic Separation: Selective Heterogeneous Agglomeration with Coarse Magnetite Particles
    Ilhwan Park; Topan Satria Gumilang; Rinaldi Yudha Pratama; Sanghee Jeon; Carlito Baltazar Tabelin; Theerayut Phengsaart; Muhammad Bilal; Youhei Kawamura; Mayumi Ito
    Minerals, 19 Jul. 2025
    Scientific journal
  • Synthesis of Iron-Based and Aluminum-Based Bimetals: A Systematic Review
    Jeffrey Ken B. Balangao; Carlito Baltazar Tabelin; Theerayut Phengsaart; Joshua B. Zoleta; Takahiko Arima; Ilhwan Park; Walubita Mufalo; Mayumi Ito; Richard D. Alorro; Aileen H. Orbecido; Arnel B. Beltran; Michael Angelo B. Promentilla; Sanghee Jeon; Kazutoshi Haga; Vannie Joy T. Resabal
    Metals, 27 May 2025
    Scientific journal
  • Effects of Salinity Level on Microplastic Removal in Simulated Waters Using Agglomeration–Micro-Flotation
    Theerayut Phengsaart; Palot Srichonphaisarn; Worada Khwathichak; Chanatip Bumrungsak; Ilhwan Park; Mayumi Ito; Mylah Villacorte-Tabelin; Carlito Baltazar Tabelin; Sanghee Jeon; Kazutoshi Haga; Onchanok Juntarasakul
    Water, 23 Apr. 2025
    Scientific journal
  • Application of Surface-Modified Natural Magnetite as a Magnetic Carrier for Microplastic Removal from Water
    Palot Srichonphaisarn; Natatsawas Soonthornwiphat; Pongsiri Julapong; Thanakornkan Limlertchareonwanit; Thidarat Meekoch; Ilhwan Park; Mylah Villacorte-Tabelin; Onchanok Juntarasakul; Somsak Saisinchai; Carlito Baltazar Tabelin; Theerayut Phengsaart
    Minerals, 18 Apr. 2025
    Scientific journal
  • 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, Informa UK Limited, 02 Oct. 2024
    Scientific journal
  • 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, Elsevier BV, Aug. 2024
    Scientific journal
  • 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, MDPI AG, 07 May 2024
    Scientific journal, 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, MDPI AG, 26 Mar. 2024
    Scientific journal, 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.
  • 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
    Research Square Platform LLC, 05 Jan. 2024
    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.
  • 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, MDPI AG, 14 Oct. 2023
    Scientific journal, 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, Elsevier BV, Oct. 2023
    Scientific journal
  • 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, MDPI AG, 18 Sep. 2023
    Scientific journal, 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, MDPI AG, 28 Jul. 2023
    Scientific journal, 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, MDPI AG, 19 Jul. 2023
    Scientific journal, 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, MDPI AG, 18 Jul. 2023
    Scientific journal, 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, MDPI AG, 07 Jul. 2023
    Scientific journal, 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.
  • Development of Microencapsulation-Hybrid Jig Separation Technique as a Clean Coal Technology
    Theerayut Phengsaart; Ilhwan Park; Jirathpapol Pasithbhattarabhorn; Palot Srichonphaisarn; Chinawich Kertbundit; Nutthakarn Phumkokrux; Onchanok Juntarasakul; Carlito Baltazar Tabelin; Naoki Hiroyoshi; Mayumi Ito
    Energies, 03 Mar. 2023
    Scientific journal
  • Development of a three-step approach to repurpose nickel-laterite mining waste into magnetite adsorbents for As(III) and As(V) removal: Synthesis, characterization and adsorption studies
    Einstine M. Opiso; Carlito Baltazar Tabelin; Leonard Marc Ramos; Leonar Jun R. Gabiana; Marybeth Hope T. Banda; Jet Ryan Y. Delfinado; Aileen H. Orbecido; Joshua B. Zoleta; Ilhwan Park; Takahiko Arima; Mylah Villacorte-Tabelin
    Journal of Environmental Chemical Engineering, 11, 1, 108992, 108992, Elsevier BV, Feb. 2023
    Scientific journal
  • Editorial for Special Issue “Sustainable Production of Metals for Low-Carbon Technologies”
    Ilhwan Park; Marthias Silwamba
    Minerals, Jan. 2023
    Scientific journal
  • Geochemical audit of a historical tailings storage facility in Japan: Acid mine drainage formation, zinc migration and mitigation strategies
    Carlito Baltazar Tabelin; Asuka Uyama; Shingo Tomiyama; Mylah Villacorte-Tabelin; Theerayut Phengsaart; Marthias Silwamba; Sanghee Jeon; Ilhwan Park; Takahiko Arima; Toshifumi Igarashi
    Journal of Hazardous Materials, 438, 129453, 129453, Elsevier BV, Sep. 2022
    Scientific journal
  • 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, MDPI AG, 30 Aug. 2022
    Scientific journal, 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, MDPI AG, 06 Jun. 2022
    Scientific journal, 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.
  • The Challenges and Prospects of Recovering Fine Copper Sulfides from Tailings Using Different Flotation Techniques: A Review
    Muhammad Bilal; Ilhwan Park; Vothy Hornn; Mayumi Ito; Fawad Ul Hassan; Sanghee Jeon; Naoki Hiroyoshi
    Minerals, May 2022
    Scientific journal
  • 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, Apr. 2022
    Scientific journal
  • 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, Apr. 2022
    Scientific journal
  • 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, Feb. 2022, [Peer-reviewed]
  • Advances in Selective Flotation and Leaching Process in Metallurgy
    Ilhwan Park
    Metals, Jan. 2022
    Scientific journal
  • 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
    Sanghee Jeon; Sharrydon Bright; Ilhwan Park; Akuru Kuze; Mayumi Ito; Naoki Hiroyoshi
    Minerals, 12, 1, Jan. 2022, [Peer-reviewed]
    Scientific journal
  • Recovery of Rare Earth Metals (REMs) from Nickel Metal Hydride Batteries of Electric Vehicles
    Manis Kumar Jha; Pankaj Kumar Choubey; Om Shankar Dinkar; Rekha Panda; Rajesh Kumar Jyothi; Kyoungkeun Yoo; Ilhwan Park
    Minerals, Dec. 2021
    Scientific journal
  • Development of Hydrometallurgical Process for Recovery of Rare Earth Metals (Nd, Pr, and Dy) from Nd-Fe-B Magnets
    Pankaj Kumar Choubey; Nityanand Singh; Rekha Panda; Rajesh Kumar Jyothi; Kyoungkeun Yoo; Ilhwan Park; Manis Kumar Jha
    Metals, Dec. 2021
    Scientific journal
  • Beneficiation of Low-Grade Rare Earth Ore from Khalzan Buregtei Deposit (Mongolia) by Magnetic Separation
    Ilhwan Park; Yuki Kanazawa; Naoya Sato; Purevdelger Galtchandmani; Manis Kumar Jha; Carlito Baltazar Tabelin; Sanghee Jeon; Mayumi Ito; Naoki Hiroyoshi
    Minerals, 11, 12, Dec. 2021, [Peer-reviewed]
    Scientific journal
  • 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, Dec. 2021, [Peer-reviewed]
  • 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, Oct. 2021, [Peer-reviewed]
  • 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, Oct. 2021, [Peer-reviewed]
  • A novel arsenic immobilization strategy via a two-step process: Arsenic concentration from dilute solution using schwertmannite and immobilization in Ca–Fe–AsO4 compounds
    Ilhwan Park; Takashino Ryota; Takeuchi Yuto; Carlito Baltazar Tabelin; Theerayut Phengsaart; Sanghee Jeon; Mayumi Ito; Naoki Hiroyoshi
    Journal of Environmental Management, 295, Oct. 2021, [Peer-reviewed]
    Scientific journal
  • 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, Sep. 2021, [Peer-reviewed]
  • 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
    Sanghee Jeon; Sharrydon Bright; Ilhwan Park; Carlito Baltazar Tabelin; Mayumi Ito; Naoki Hiroyoshi
    Metals, 11, 9, Aug. 2021, [Peer-reviewed]
    Scientific journal
  • Enhanced pyrite passivation by carrier-microencapsulation using Fe-catechol and Ti-catechol complexes
    Xinlong Li; Ilhwan Park; Carlito Baltazar Tabelin; Kosuke Naruwa; Taiki Goda; Chie Harada; Sanghee Jeon; Mayumi Ito; Naoki Hiroyoshi
    Journal of Hazardous Materials, 416, Aug. 2021, [Peer-reviewed]
    Scientific journal
  • 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, Jul. 2021, [Peer-reviewed]
  • 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, Jul. 2021, [Peer-reviewed]
  • Enhanced cementation of Cd2+, Co2+, Ni2+, and Zn2+ on Al from sulfate solutions by activated carbon addition
    S. Choi; S. Jeon; I. Park; C.B. Tabelin; M. I; N. Hiroyoshi
    Hydrometallurgy, 201, May 2021, [Peer-reviewed]
  • Synthesis and characterization of coal fly ash and palm oil fuel ash modified artisanal and small-scale gold mine (ASGM) tailings based geopolymer using sugar mill lime sludge as Ca-based activator
    Einstine M. Opiso; Carlito B. Tabelin; Christian V. Maestre; John Paul J. Aseniero; Ilhwan Park; Mylah Villacorte-Tabelin
    Heliyon, 7, 4, Elsevier Ltd, 01 Apr. 2021
    English, Scientific journal
  • Suppression of arsenopyrite oxidation by microencapsulation using ferric-catecholate complexes and phosphate
    Ilhwan Park; Kazuki Higuchi; Carlito Baltazar Tabelin; Sanghee Jeon; Mayumi Ito; Naoki Hiroyoshi
    Chemosphere, 269, Apr. 2021, [Peer-reviewed]
    Scientific journal
  • 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, MDPI AG, 01 Mar. 2021
    English, Scientific journal
  • 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, Mar. 2021, [Peer-reviewed]
  • 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, MDPI AG, 02 Feb. 2021
    Scientific journal, 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, Feb. 2021, [Peer-reviewed]
  • 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, Dec. 2020, [Peer-reviewed]
  • 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, Sep. 2020, [Peer-reviewed]
  • 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, Aug. 2020, [Peer-reviewed]
    English, Scientific journal
  • 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, MDPI AG, 08 Jul. 2020, [Peer-reviewed]
    English, Scientific journal, 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, Elsevier BV, Jun. 2020, [Peer-reviewed]
    English, Scientific journal
  • 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, Elsevier BV, Jun. 2020, [Peer-reviewed]
    English, Scientific journal
  • Improvement of Copper Metal Leaching in Sulfuric Acid Solution by Simultaneous Use of Oxygen and Cupric Ions
    Kyoungkeun Yoo; Yujin Park; Sanghyeon Choi; Ilhwan Park
    Metals, 10, 6, 721, 721, MDPI AG, 28 May 2020, [Peer-reviewed]
    English, Scientific journal, A new concept for copper (Cu) metal leaching by the simultaneous use of cupric ions (Cu2+) and oxygen (O2) was proposed to improve Cu metal leaching in sulfuric acid. According to this concept, Cu2+ oxidizes Cu metal into cuprous ion (Cu+), and O2 oxidizes Cu+ into Cu2+. The improvement in Cu leaching efficiency from Cu metal was investigated experimentally in the sulfuric acid solution using Cu2+ and O2 simultaneously. Furthermore, the result was compared with that for the sulfuric acid solution containing neither Cu2+ nor O2 and with the sulfuric acid solution without Cu2+ and O2. When both Cu2+ and O2 were used in the leaching solution, the leaching rate of Cu from Cu metal powder was higher than at other leaching conditions, and the leaching efficiency of Cu increased to more than 99.9% in 1 mol/L sulfuric acid solution at 400 rpm and 50 °C with ≤75 µm Cu metal powder, 1% pulp density, 10,000 mg/L initial Cu2+ concentration, and 100 cc/min O2 introduction. These results indicated that the leaching of Cu from Cu metal could be accelerated by adding Cu2+ and O2 in the sulfuric acid solution.
  • 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, MDPI AG, 23 Apr. 2020, [Peer-reviewed]
    English, Scientific journal, 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, Apr. 2020, [Peer-reviewed]
    English, Scientific journal
  • 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, 105165, 2020, [Peer-reviewed]
    English, Scientific journal
  • Agglomeration flotation of finely ground chalcopyrite: Comparison of model calculation vs. Experimental results
    Vothy Hornn; Mayumi Ito; Hiromasa Shimada; Sanghee Jeon; Ilhwan Park; Carlito Baltazar Tabelin; Naoki Hiroyoshi; Shigeto Kuroiwa; Yuji Aoki
    15th International Symposium on East Asian Resources Recycling Technology, EARTH 2019, The Korean Institute of Resources Recycling, 2020
    English, International conference proceedings
  • Agglomeration-flotation of finely ground chalcopyrite: Effects of agitation strength in agglomeration on flotation separation efficiency
    Vothy Hornn; Mayumi Ito; Hiromasa Shimada; Sanghee Jeon; Ilhwan Park; Carlito Baltazar Tabelin; Naoki Hiroyoshi; Shigeto Kuroiwa; Yuji Aoki
    15th International Symposium on East Asian Resources Recycling Technology, EARTH 2019, The Korean Institute of Resources Recycling, 2020
    English, International conference proceedings
  • Effects of flatness ratio on the particle motion during jig separation of plastic and improvement of jig separation efficiency using modified water pulsation
    Theerayut Phengsaart; Daiki Kitayama; Arisa Azuma; Sanghee Jeon; Ilhwan Park; Carlito Baltazar Tabelin; Naoki Hiroyoshi; Mayumi Ito
    15th International Symposium on East Asian Resources Recycling Technology, EARTH 2019, The Korean Institute of Resources Recycling, 2020
    English, International conference proceedings
  • Development of discharge systems using restraining walls for continuous jig separation of plastics to improve purity of bottom layer products
    Theerayut Phengsaart; Shoko Kimura; Arisa Azuma; Sanghee Jeon; Ilhwan Park; Carlito Baltazar Tabelin; Naoki Hiroyoshi; Mayumi Ito
    15th International Symposium on East Asian Resources Recycling Technology, EARTH 2019, The Korean Institute of Resources Recycling, 2020
    English, International conference proceedings
  • Lead removal in zinc leach residues from Kabwe, Zambia by carrier-in-pulp method using zero-valent iron
    M. Silwamba; M. Ito; T. Fukushima; I. Park; S. Jeon; C. B. Tabelin; N. Hiroyoshi
    15th International Symposium on East Asian Resources Recycling Technology, EARTH 2019, The Korean Institute of Resources Recycling, 2020
    English, International conference proceedings
  • Estimation of settling velocity and jig separation efficiency of non-spherical plastics using flatness ratio
    Theerayut Phengsaart; Arisa Azuma; Daiki Kitayama; Sanghee Jeon; Ilhwan Park; Carlito Baltazar Tabelin; Naoki Hiroyoshi; Mayumi Ito
    15th International Symposium on East Asian Resources Recycling Technology, EARTH 2019, The Korean Institute of Resources Recycling, 2020
    English, International conference proceedings
  • Effects of particle geometry on the bubble attachment during hybrid jig separation
    Theerayut Phengsaart; Arisa Azuma; Daiki Kitayama; Shoko Kimura; Sumetas Rittiboon; Apiset Wongthanuwat; Dawan Wiwattanadate; Sanghee Jeon; Ilhwan Park; Carlito Baltazar Tabelin; Naoki Hiroyoshi; Mayumi Ito
    15th International Symposium on East Asian Resources Recycling Technology, EARTH 2019, The Korean Institute of Resources Recycling, 2020
    English, International conference proceedings
  • Effects of galvanic interactions between lead-activated sphalerite and pyrite on flotation
    K. Aikawa; T. Segawa; S. Jeon; I. Park; C. B. Tabelin; N. Hiroyoshi; M. Ito
    15th International Symposium on East Asian Resources Recycling Technology, EARTH 2019, 2020
    International conference proceedings
  • 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, Elsevier BV, Jan. 2020, [Peer-reviewed], [Lead author, Corresponding author]
    English, Scientific journal
  • 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, Elsevier BV, Jan. 2020, [Peer-reviewed]
    English, Scientific journal
  • A review of recent strategies for acid mine drainage prevention and mine tailings recycling
    Ilhwan Park; Carlito Baltazar Tabelin; Sanghee Jeon; Xinlong Li; Kensuke Seno; Mayumi Ito; Naoki Hiroyoshi
    Chemosphere, 219, 588, 606, Mar. 2019, [Peer-reviewed]
    English, Scientific journal
  • 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 Clea; Theerayut Phengsaart; Ilhwan Park; Naoki Hiroyoshi; Mayumi Ito
    Minerals Engineering, 143, 105931, 2019, [Peer-reviewed]
    English, Scientific journal
  • Development of advanced pyrite passivation strategies towards sustainable management of acid mine drainage
    Carlito Baltazar Tabelin; Ilhwan Park; Xinlong Li; Sophea Seng; Mylah Villacorte-Tabelin; Toshifumi Igarashi; Mayumi Ito; Naoki Hiroyoshi
    IOP Conference Series: Earth and Environmental Science, 351, 012010, 2019, [Peer-reviewed]
    English, International conference proceedings
  • A physical separation scheme to improve ammonium thiosulfate leaching of gold by separation of base metals in crushed mobile phones
    Sanghee Jeon; Mayumi Ito; Carlito Baltazar Tabelin; Rongrit Pongsumrankul; Shinya Tanaka; Naho Kitajima; Ayumu Saito; Ilhwan Park; Naoki Hiroyoshi
    Minerals Engineering, 138, 168, 177, 2019, [Peer-reviewed]
    English, Scientific journal
  • Carrier-microencapsulation using Al-catecholate complex to suppress arsenopyrite oxidation: Evaluation of the coating stability under simulated weathering conditions
    Kensuke Seno; Ilhwan Park; Carlito Tabelin; Kagehiro Magaribuchi; Mayumi Ito; Naoki Hiroyoshi
    MATEC Web of Conferences, 268, 06002, 2019, [Peer-reviewed]
    English, International conference proceedings
  • Formation of surface protective coatings on arsenopyrite using Al-catecholate complex and its mode of inhibition of arsenopyrite oxidation
    Ilhwan Park; Carlito Tabelin; Hiroyuki Inano; Kensuke Seno; Kazuki Higuchi; Mayumi Ito; Naoki Hiroyoshi
    MATEC Web of Conferences, 268, 06015, 2019, [Peer-reviewed]
    English, International conference proceedings
  • 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
    Carlito Baltazar Tabelin; Toshifumi Igarashi; Mylah Villacorte-Tabelin; Ilhwan Park; Einstine M. Opiso; Mayumi Ito; Naoki Hiroyoshi
    Science of The Total Environment, 645, 1522, 1553, Dec. 2018, [Peer-reviewed]
    English, Scientific journal
  • 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, Oct. 2018, [Peer-reviewed]
  • Simultaneous suppression of acid mine drainage formation and arsenic release by Carrier-microencapsulation using aluminum-catecholate complexes
    Ilhwan Park; Carlito Baltazar Tabelin; Kensuke Seno; Sanghee Jeon; Mayumi Ito; Naoki Hiroyoshi
    Chemosphere, 205, 414, 425, Aug. 2018, [Peer-reviewed]
    English, Scientific journal
  • 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, Elsevier Ltd, 01 Jul. 2018, [Peer-reviewed]
    English, Scientific journal
  • Behaviors of Cyanide Leaching of Gold in Tailings and Adsorption of Gold Ions on Activated Carbon
    Jayhyun Park; Ilhwan Park; Jumi Oh; Kyoungkeun Yoo
    The Korean Society of Mineral and Energy Resources Engineers, 55, 5, 414, 420, 2018, [Peer-reviewed]
    Scientific journal
  • Interference of coexisting copper and aluminum on the ammonium thiosulfate leaching of gold from printed circuit boards of waste mobile phones
    Sanghee Jeon; Carlito Baltazar Tabelin; Hirotaka Takahashi; Ilhwan Park; Mayumi Ito; Naoki Hiroyoshi
    Waste Management, 81, 148, 156, 2018, [Peer-reviewed]
    English, Scientific journal
  • Suppression of the release of arsenic from arsenopyrite by carrier-microencapsulation using Ti-catechol complex
    Ilhwan Park; Carlito Baltazar Tabelin; Kagehiro Magaribuchi; Kensuke Seno; Mayumi Ito; Naoki Hiroyoshi
    Journal of hazardous materials, 344, 322, 332, 2018, [Peer-reviewed]
    English, Scientific journal
  • 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, Dec. 2017, [Peer-reviewed]
    English, Scientific journal
  • 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, Nov. 2017, [Peer-reviewed]
    English, Scientific journal
  • Leaching of Copper from Cuprous Oxide in Aerated Sulfuric Acid
    Ilhwan Park; Kyoungkeun Yoo; Richard Diaz Alorro; Min-Seuk Kim; Soo-Kyung Kim
    MATERIALS TRANSACTIONS, 58, 10, 1500, 1504, 2017, [Peer-reviewed]
    English, Scientific journal
  • The Effect of Grinding and Roasting Conditions on the Selective Leaching of Nd and Dy from NdFeB Magnet Scraps
    Ho-Sung Yoon; Chul-Joo Kim; Kyung Woo Chung; Sanghee Jeon; Ilhwan Park; Kyoungkeun Yoo; Manis Kumar Jha
    METALS, 5, 3, 1306, 1314, Sep. 2015, [Peer-reviewed]
    English, Scientific journal
  • Fine Particle Classification and Dewatering of Construction Waste Slurry Using Hydrocyclone
    Hee-young Shin; Sang-woo Ji; Sanghyeon Choi; Ilhwan Park; Kyoungkeun Yoo; Jay Hyun Park; Richard Diaz Alorro
    The Korean Society of Mineral and Energy Resources Engineers, 52, 6, 627, 631, 2015, [Peer-reviewed]
    Scientific journal
  • The effects of temperature and agitation speed on the leaching behaviors of tin and bismuth from spent lead free solder in nitric acid leach solution
    Sanghee Jeon; Ilhwan Park; Kyoungkeun Yoo; Hojin Ryu
    Geosystem Engineering, 18, 4, 213, 218, 2015, [Peer-reviewed]
    English, Scientific journal
■ Other Activities and Achievements
  • Carrier magnetic separation to recover finely ground rare earth minerals: The effect of gravity separation as a pre-concentration step
    Ilhwan Park; Taito Horii; Mayumi Ito; Naoki Hiroyoshi, Proceedings of International Symposium on Earth Science and Technology 2022, Dec. 2022
    English, Introduction international proceedings
  • Flotation of finely ground chalcopyrite in the presence of nanobubbles
    Yukun Liu; Naoki Hiroyoshi; Mayumi Ito; Ilhwan Park, Proceedings of International Symposium on Earth Science and Technology 2022, Dec. 2022
    English, Introduction international proceedings
  • Iron Oxide as Electron Mediator in Gold Cementation with Zero-Valent Aluminum in Gold-Copper Ammoniacal Thiosulfate Medium
    Joshua B. Zoleta; Sanghee Jeon; Akuru Kuze; Ilhwan Park; Mayumi Ito; Naoki Hiroyoshi, Proceedings of International Symposium on Earth Science and Technology 2022, Dec. 2022
    English, Introduction international proceedings
  • Application of microencapsulation technique for improving flotation separation of chalcopyrite and molybdenite
    Ilhwan Park; Dai Uchida; Kosei Aikawa; Sanghee Jeon; Mayumi Ito; Naoki Hiroyoshi, Proceedings of Copper 2022, Nov. 2022
    English, Introduction international proceedings
  • Refractory gold ores: A focus on advances in pretreatment techniques in thiosulfate leaching systems of As/Sb bearing gold ores
    Takunda Joseph Mhandu; Shota Hamatsu; Sanhee Jeon; Ilhwan Park; Mayumi Ito; Naoki Hiroyoshi, Proceedings of the 16th International Symposium on East Asian Resources Recycling Technology, Oct. 2022
    English, Introduction international proceedings
  • Effects of anglesite on the flotation of sphalerite in complex sulphide ores and a method to suppress sphalerite floatability
    K. Aikawa, M. Ito, A. Kusano, S. Jeon, I. Park, N. Hiroyoshi, Proceedings of International Mineral Processing Congress Asia-Pacific 2022, Aug. 2022
    English, Introduction international proceedings
  • Investigation of Flotation Behaviors of Fine Particles in a Complex Ore Consisting of Various Copper Minerals
    Y. Ebisu; J. V. Satur; K. Mitsuhashi; K. Aikawa; T. Suto; I. Park; M. Ito; N. Hiroyoshi, Proceedings of International Mineral Processing Congress Asia-Pacific 2022, Aug. 2022
    English, Introduction international proceedings
  • Challenges and approaches to flotation of seafloor massive sulphide ores
    K. Aikawa; I. Park; N. Hiroyoshi; M. Ito, Proceedings of International Future Mining Conference 2021 (web), Dec. 2021
    English, Introduction international proceedings
  • A study on the water injection method of Falcon-Knelson concentrator
    R. Matsuoka; M. Ito; S. Jeon; I. Park; N. Hiroyoshi, Proceedings of International Symposium on Earth Science and Technology 2021, Nov. 2021
    English, Introduction international proceedings
  • Effects of coexisting pyrite on suppression of sphalerite in the flotation of copper-zinc sulfides
    N. Orii; M. Ito; K. Aikawa; S. Jeon; I. Park; R. Magwaneng; T. Ono; T. Sakakibara; K. Sunada; N. Hiroyoshi, Proceedings of International Symposium on Earth Science and Technology 2021, Nov. 2021
    English, Introduction international proceedings
  • Study of autogenous carrier flotation technique for finely ground chalcopyrite particles – a review
    M. Bilal; M. Ito; K. Koike; V. Hornn; F.U. Hassan; S. Jeon; I. Park; N. Hiroyoshi, Proceedings of International Symposium on Earth Science and Technology 2021, Nov. 2021
    English, Introduction international proceedings
  • A new method to detect product boundary in jig separator using pressure sensor
    N. Sawada; M. Ito; S. Kimura; I. Park; S. Jeon; N. Hiroyoshi, Proceedings of International Symposium on Earth Science and Technology 2021, Nov. 2021
    English, Introduction international proceedings
  • A REVIEW OF GOLD EXTRACTION FROM ARSENIC/ANTIMONY BEARING ORES
    T.J. Mhandu; N. Hiroyoshi; M. Ito; I. Park; S. Jeon, Proceedings of International Symposium on Earth Science and Technology 2021, Nov. 2021
    English, Introduction international proceedings
  • Enhanced magnetic separation of finely-ground rare earth minerals by oil agglomeration
    Y. Kanazawa; M. Ito; N. Sato; S. Jeon; I. Park; N. Hiroyoshi, Proceedings of International Symposium on Earth Science and Technology 2021, Nov. 2021
    English, Introduction international proceedings
  • Agglomeration-flotation to minimize the loss of finely-ground copper sulfides to tailings causing environmental pollution at mine sites
    T. Suto; M. Ito; H. Shimada; S. Jeon; I. Park; N. Hiroyoshi, Proceedings of Geo-environmental Engineering and Recycling (GER) 2021 (web), Nov. 2021
    English, Introduction international proceedings
  • Selective formation of hydrophilic iron phosphate coating on chalcopyrite to separate from sphalerite in flotation
    I. Park; S. Hong; U. Dai; S. Jeon; M. Ito; N. Hiroyoshi, Proceedings of Geo-environmental Engineering and Recycling (GER) 2021 (web), Nov. 2021
    English, Introduction international proceedings
  • 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 study of autogenous carrier flotation technique for selective separation of fine chalcopyrite
    M. Bilal; M. Ito; K. Koike; I. Park; S. Jeon; N. Hiroyoshi, Proceedings of International Conference on Innovations for Sustainable and Responsible Mining (ISRM) 2020, Oct. 2020
    English, Introduction international proceedings
  • Microencapsulation of Chalcopyrite and Molybdenite using Fe2+ and PO43– for Selective Flotation
    S. Hong; I. Park; S. Jeon; M. Ito; N. Hiroyoshi, Proceedings of International Conference on Innovations for Sustainable and Responsible Mining (ISRM) 2020, Oct. 2020
    English, Introduction international proceedings
  • Simultaneous extraction and sequestration of lead and zinc from zinc leach residues using acidified brine solution and zero-valent aluminum
    M. Silwamba; M. Ito; I. Park; C.B. Tabelin; S. Jeon; N. Hiroyoshi, Proceedings of International Mineral Processing Congress (IMPC) 2020, Oct. 2020
    English, Introduction international proceedings
  • 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, 01 Sep. 2020
    MDPI AG, English, Book review
  • 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
  • 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
  • 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
    English, Summary international conference
  • 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
    English, Summary international conference
  • 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
    English, Summary international conference
  • 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
    English, Summary international conference
  • 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
    English, Summary international conference
  • 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
    English, Summary international conference
  • 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
    English, Summary international conference
■ Syllabus
  • 資源環境修復学, 2024年, 修士課程, 工学院
  • 資源環境修復学特論, 2024年, 修士課程, 工学院
  • 資源環境修復学特論, 2024年, 博士後期課程, 工学院
  • 物理化学演習, 2024年, 学士課程, 工学部
  • 技術英語, 2024年, 学士課程, 工学部
  • 資源循環システム実験Ⅰ, 2024年, 学士課程, 工学部
  • 資源循環システム実験Ⅲ, 2024年, 学士課程, 工学部
  • 物理化学, 2024年, 学士課程, 工学部
  • 資源循環デザイン, 2024年, 学士課程, 工学部
■ Research Themes
  • Development of a novel eco-friendly process for gold extraction from refractory ores: Application of microencapsulation technique to gold hydrometallurgical process towards achieving carbon neutrality
    科学研究費助成事業
    01 Apr. 2024 - 31 Mar. 2027
    PARK ILHWAN
    日本学術振興会, 若手研究, 北海道大学, 24K17639
  • Development of gold extraction method for green mining and its application to refractory ore processing
    Grants-in-Aid for Scientific Research
    01 Apr. 2023 - 31 Mar. 2026
    廣吉 直樹; 伊藤 真由美; PARK ILHWAN
    硫ヒ鉄鉱などの硫化鉱物の結晶中に金が閉じ込められた形で存在する難処理金鉱石から，毒性の高いシアンに替わる安全な溶媒を用いて金を抽出する技術を開発することを目指して，チオ硫酸アンモニア溶液を用いたヒ素含有難処理鉱から金の浸出・回収法について検討した.
    金粉末と硫ヒ鉄鉱の混合物を用いたモデル実験を行い, チオ硫酸アンモニウム溶液中での金の抽出に及ぼす硫ヒ鉄鉱の影響を調べた. このモデル実験では硫化鉱物の結晶中に金が含まれているわけではないが, それでも硫ヒ鉄鉱が共存すると金の抽出率が著しく低下した.SEM-EDX や XPS による表面分析の結果, 浸出の過程で金の表面には硫化銅, 酸化鉄および元素硫黄などの薄膜が生成することが確かめられたが, この薄膜は硫ヒ素鉄鉱の共存の有無に関わらず生成しており, 金の浸出を抑制する不動態膜とは考えられない．溶液分析の結果によれば, 硫ヒ鉄鉱が共存する場合には存在しない時よりも急速に 金の浸出に不可欠なチオ硫酸イオンが分解することが確かめられたことから, 硫ヒ鉄鉱の共存によるチオ硫酸イオンの分解が金浸出抑制の主原因であるものと考えられる.
    浸出貴液からの金の回収法として，アルミニウムを電子供与体，活性炭を電子伝達媒体粒子とするセメンテーション法について検討した．溶液分析や電子顕微鏡観察などの結果，金はアルミニウムの表面に付着した活性炭上に還元析出して回収されることが確認された．活性炭を用いた場合，溶液中に浸出触媒として含まれる銅も金とともに非選択的に還元析出してしまったが，活性炭の代わりに半導体性の酸化鉄 (マグネタイトあるいはヘマタイト) を用いて実験したところ，金のみが選択的に還元析出することを見出した．
    Japan Society for the Promotion of Science, Grant-in-Aid for Scientific Research (C), Hokkaido University, 23K04642
  • Co-creation of digital twin technology for efficient blasting in the Mining 4.0 era
    Grants-in-Aid for Scientific Research
    07 Oct. 2021 - 31 Mar. 2025
    川村 洋平; 北原 格; 宍戸 英彦; 鳥屋 剛毅; 福田 大祐; 菊池 亮佑; PARK ILHWAN; 謝 淳
    本共同研究は、世界の鉱業が目指す“2050年の低炭素型自動化・無人化鉱山操業”を牽引する次世代鉱山デジタルツインテクノロジーを開発するものである。自動化および無人化が最も必要とされる発破現場の切羽と発破起砕物（モックパイル）を対象に、３次元形状復元などの多次元情報処理と深層学習に代表される人工知能を統合することでCyber-Physical Blastingプラットフォームを構築する。その中で多様な発破シミュレーションおよび検証実験を繰り返し、モックパイル粒度分布推定や発破デザインなどの自動化システムを実装することにより、最適発破計画、発破効率向上、生産率向上、生産管理および安全管理を実現とするものである。
    本研究チームは、鉱業界で世界随一の規模と研究体制を誇るの研究教育コンソーシアムMining Education Australiaと関わりが深く、MEAが推し進める“未来のスマートマイニングに資する共同研究”に、本研究の研究成果である高度ICTを導入することで国際共同研究開発を加速・推進した。国内外の先進的な研究者で組織された学際研究チームが、上記コンソーシアムや海外資源採掘企業と緊密に連携しながら研究開発を実施することにより、実用化の先鞭を付けること目指した。
    3年目である2023年度は10名の若手研究者（修士学生）をCurtin大学、Queensland大学へ1カ月派遣した。また、Curtin大学からはオーストラリア側対応者であるHyongdoo Jang氏を日本に招聘し研究打合せと講演を実現した。さらにブリスベンで開催されたWorld Mining Congressに3名の関係学生を派遣し、学会発表や懇親を行う等の十分な交流を実現した。国内では研究項目である人工知能による発破デザイン最適化システムを開発して。
    Japan Society for the Promotion of Science, Fund for the Promotion of Joint International Research (Fostering Joint International Research (B)), Hokkaido University, 21KK0070
  • Development of an advanced magnetic separation technology assisted by agglomeration for improving the recovery of rare earth minerals from finely ground low-grade ores
    Grants-in-Aid for Scientific Research Grant-in-Aid for Early-Career Scientists
    Apr. 2020 - Mar. 2023
    Ilhwan Park
    This research aimed at developing advanced magnetic separation techniques to improve the recovery of finely-ground rare earth-bearing minerals. Specifically, this research investigated two approaches: (i) agglomeration-magnetic separation and (ii) carrier-magnetic separation.
    The conventional magnetic separation was inefficient in recovering finely-ground rare earth minerals (D50=2.9 μm) because magnetic force acting on a particle is directly proportional to its volume; that is, the finer the particle, the lower the magnetic force. The application of agglomeration process using emulsified kerosene prior to magnetic separation improved the recovery of rare earth mineral (i.e., bastnaesite-(Ce) (Ce(CO3)F)) from 50% to 94% due to the increase in particle size to > 8 μm. Moreover, the addition of magnetic particles like zero-valent iron as a carrier was effective in recovering fine bastnaesite.
    Japan Society for the Promotion of Science, Grant-in-Aid for Early-Career Scientists, Hokkaido University, 20K15214
  • Development of a novel and high efficient recovery process for gold from gold ore in ammonium thiosulfate solvent
    金属資源の生産技術に関する基礎研究
    Apr. 2020 - Mar. 2022
    Sanghee Jeon; Naoki Hiroyoshi; Mayumi Ito; Ilhwan Park; Sharrydon Brigh
    Japan Oil, Gas and Metals National Corporation (JOGMEC), Hokkaido University, Coinvestigator
  • Application of Microencapsulation Technique for the Selective Flotation of Sulfide Minerals
    金属資源の生産技術に関する基礎研究
    Apr. 2019 - Mar. 2021
    Ilhwan Park; Naoki Hiroyoshi; Mayumi Ito; Higuchi Kazuki; Seunggwan Hong
    Japan Oil, Gas and Metals National Corporation (JOGMEC), 金属資源の生産技術に関する基礎研究, Hokkaido University, Principal investigator
  • Development of flotation technology for fine particles
    Apr. 2019
    Naoki Hiroyoshi; Mayumi Ito; Ilhwan Park; Vothy Hornn; Hiromasa Shimada
    Sumitomo Metal Mining Co., Ltd., Hokkaido University, Coinvestigator not use grants
  • A basic study for elucidating the mechanism of Zn-mineral depression in Cu-Zn flotation separation
    難処理鉱選鉱製錬技術開発事業
    Apr. 2019
    Mayumi Ito; Ilhwan Park; Kosei Aikawa; Nodoka Orii
    Japan Oil, Gas and Metals National Corporation (JOGMEC), Hokkaido University, Coinvestigator not use grants