A Comparative Study on Bioleaching Properties of Various Sulfide Minerals Using <i>Acidiphilium cryptum</i>
Bioleaching has been regarded as a green alternative to chemical leaching in metal extraction processes. In this study, the bioleaching properties of indigenous acidophilic bacteria for various sulfide minerals were compared and evaluated in terms of pH reduction and metal leaching. The primary mine...
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MDPI AG
2023-05-01
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| Series: | Applied Sciences |
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| Online Access: | https://www.mdpi.com/2076-3417/13/10/5997 |
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| author | Kang-Hee Cho Hyun-Soo Kim Chang-Gu Lee Seong-Jik Park Nag-Choul Choi |
| author_facet | Kang-Hee Cho Hyun-Soo Kim Chang-Gu Lee Seong-Jik Park Nag-Choul Choi |
| author_sort | Kang-Hee Cho |
| collection | DOAJ |
| description | Bioleaching has been regarded as a green alternative to chemical leaching in metal extraction processes. In this study, the bioleaching properties of indigenous acidophilic bacteria for various sulfide minerals were compared and evaluated in terms of pH reduction and metal leaching. The primary minerals in the samples were sphalerite (ZnS) (SP), galena (PbS) (GN1 and GN2), pyrite (FeS<sub>2</sub>) (PY), and chalcopyrite (CuFeS<sub>2</sub>) (CCP), and an indigenous acidophilic bacterium, <i>Acidiphilium cryptum</i> (99.56%), was applied for bioleaching experiments. The metal extraction in bioleaching differed according to the mineral content. The leached metal concentration of Zn was higher than that of Pb for the SP sample with a high ZnS content, whereas the concentration of Pb was higher than that of Zn for the GN1 and GN2 samples with a high PbS content. Meanwhile, the leaching rate of Zn was faster than that of Pb for all samples. Corrosion action was observed on the surface of bacterial residues in SP and GN1 samples. These results show that the bioleaching mechanism based on sulfide minerals proceeds through indirect biological oxidation, chemical oxidation, and direct bacterial oxidation. The results of this study can provide basic research data for process optimization when employing bioleaching to extract valuable metals. |
| first_indexed | 2024-03-11T03:58:30Z |
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| institution | Directory Open Access Journal |
| issn | 2076-3417 |
| language | English |
| last_indexed | 2024-03-11T03:58:30Z |
| publishDate | 2023-05-01 |
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| spelling | doaj.art-3cab32b7ff0747fdaf23f594742db9d12023-11-18T00:19:02ZengMDPI AGApplied Sciences2076-34172023-05-011310599710.3390/app13105997A Comparative Study on Bioleaching Properties of Various Sulfide Minerals Using <i>Acidiphilium cryptum</i>Kang-Hee Cho0Hyun-Soo Kim1Chang-Gu Lee2Seong-Jik Park3Nag-Choul Choi4Research Institute of Agriculture and Life Sciences, Seoul National University, Seoul 08826, Republic of KoreaDepartment of Energy and Resource Engineering, Chosun University, Gwangju 61452, Republic of KoreaDepartment of Environmental and Safety Engineering, Ajou University, Suwon 16499, Republic of KoreaDepartment of Bioresources and Rural System Engineering, Hankyong National University, Anseong 17579, Republic of KoreaResearch Institute of Agriculture and Life Sciences, Seoul National University, Seoul 08826, Republic of KoreaBioleaching has been regarded as a green alternative to chemical leaching in metal extraction processes. In this study, the bioleaching properties of indigenous acidophilic bacteria for various sulfide minerals were compared and evaluated in terms of pH reduction and metal leaching. The primary minerals in the samples were sphalerite (ZnS) (SP), galena (PbS) (GN1 and GN2), pyrite (FeS<sub>2</sub>) (PY), and chalcopyrite (CuFeS<sub>2</sub>) (CCP), and an indigenous acidophilic bacterium, <i>Acidiphilium cryptum</i> (99.56%), was applied for bioleaching experiments. The metal extraction in bioleaching differed according to the mineral content. The leached metal concentration of Zn was higher than that of Pb for the SP sample with a high ZnS content, whereas the concentration of Pb was higher than that of Zn for the GN1 and GN2 samples with a high PbS content. Meanwhile, the leaching rate of Zn was faster than that of Pb for all samples. Corrosion action was observed on the surface of bacterial residues in SP and GN1 samples. These results show that the bioleaching mechanism based on sulfide minerals proceeds through indirect biological oxidation, chemical oxidation, and direct bacterial oxidation. The results of this study can provide basic research data for process optimization when employing bioleaching to extract valuable metals.https://www.mdpi.com/2076-3417/13/10/5997bioleachingsulfide mineralpH reductionreduction ratemetal leaching |
| spellingShingle | Kang-Hee Cho Hyun-Soo Kim Chang-Gu Lee Seong-Jik Park Nag-Choul Choi A Comparative Study on Bioleaching Properties of Various Sulfide Minerals Using <i>Acidiphilium cryptum</i> Applied Sciences bioleaching sulfide mineral pH reduction reduction rate metal leaching |
| title | A Comparative Study on Bioleaching Properties of Various Sulfide Minerals Using <i>Acidiphilium cryptum</i> |
| title_full | A Comparative Study on Bioleaching Properties of Various Sulfide Minerals Using <i>Acidiphilium cryptum</i> |
| title_fullStr | A Comparative Study on Bioleaching Properties of Various Sulfide Minerals Using <i>Acidiphilium cryptum</i> |
| title_full_unstemmed | A Comparative Study on Bioleaching Properties of Various Sulfide Minerals Using <i>Acidiphilium cryptum</i> |
| title_short | A Comparative Study on Bioleaching Properties of Various Sulfide Minerals Using <i>Acidiphilium cryptum</i> |
| title_sort | comparative study on bioleaching properties of various sulfide minerals using i acidiphilium cryptum i |
| topic | bioleaching sulfide mineral pH reduction reduction rate metal leaching |
| url | https://www.mdpi.com/2076-3417/13/10/5997 |
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