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| Pyrite oxidation in column at controlled redox potential of 900 mV with and without bacteria | |
| Sun, He-Yun1,2,3; Tan, Qiao-Yi1,2,3; Jia, Yan1,2,3; Shu, Rong-Bo4; Zhong, Shui-Ping5; Ruan, Ren-Man1,2,3 | |
| 2022-12-01 | |
| Source Publication | RARE METALS
 |
| ISSN | 1001-0521 |
| Volume | 41Issue:12Pages:4279-4288 |
| Abstract | Comparisons on the bioleaching and sterile oxidation of pyrite were performed at controlled redox potential of 900 mV (vs. SHE) and different temperatures of 30 and 60 degrees C. For sterile experiments, the redox potential of irrigation solution was controlled by adding hydrogen peroxide solution (15 wt%), while the redox potential of irrigation solution for bioleaching was elevated by flowing through the packed bed in which bacteria were activated and colonized. The rate of pyrite bioleaching is faster than that of sterile oxidation at temperature of 30 degrees C. The reason is that the potential gradient of leaching solution in bioleaching column is much smaller than that in sterile column. The redox potentials of irrigation solution and leaching solution are similar for bioleaching; however, the redox potential difference of irrigation solution and leaching solution for sterile oxidation is about 150 mV. When temperature increases to 60 degrees C for sterile oxidation, the rate of pyrite leaching is faster than that of bioleaching at temperature of 30 degrees C, even though the redox potential gradient of leaching solution is great. The mineralogy analyses of pyrite residue were performed by scanning electron microscopy-energy-dispersive spectroscopy (SEM-EDS), X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS) analyses. The results confirm that pyrite oxidation might only occur at specific sites with high surface energy on surface and obeys the "indirect mechanism" whether there are bacteria or not. The pyrite oxidation rate is not inhibited by inert sulfur on residue surface at elevated redox potential. According to the conclusions, the way to accelerate pyrite oxidation is proposed. |
| Keyword | Pyrite column leaching Temperature Controlled redox potential Bacteria |
| DOI | 10.1007/s12598-016-0844-y |
| Language | 英语 |
| WOS Keyword | THIOBACILLUS-FERROOXIDANS ; LEACHING KINETICS ; DISSOLVED-OXYGEN ; SULFATE-IONS ; FERRIC IONS ; TEMPERATURE ; CONCENTRATE ; SULFUR ; IRON ; DISSOLUTION |
| Funding Project | Research Fund for Program of Efficient Gold Extraction from Refractory Gold Ore of Sichuan Province, China[12120113088100] ; National Natural Science Foundation of China[41401541] ; National Natural Science Foundation of China[51474075] ; Bureau of International Co-operation, Chinese Academy of Sciences[122111KYSB20150013] |
| WOS Research Area | Materials Science ; Metallurgy & Metallurgical Engineering |
| WOS Subject | Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering |
| Funding Organization | Research Fund for Program of Efficient Gold Extraction from Refractory Gold Ore of Sichuan Province, China ; National Natural Science Foundation of China ; Bureau of International Co-operation, Chinese Academy of Sciences |
| WOS ID | WOS:000879824700037 |
| Publisher | NONFERROUS METALS SOC CHINA |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | http://ir.ipe.ac.cn/handle/122111/55536 |
| Collection | 中国科学院过程工程研究所 |
| Corresponding Author | Ruan, Ren-Man |
| Affiliation | 1.Chinese Acad Sci, Inst Proc Engn, State Key Lab Biochem Engn, Beijing 100190, Peoples R China 2.Chinese Acad Sci, Inst Proc Engn, Key Lab Green Proc & Engn, Beijing 100190, Peoples R China 3.Chinese Acad Sci, Inst Proc Engn, Natl Engn Lab Hydromet Cleaner Prod Technol, Beijing 100190, Peoples R China 4.Chinese Acad Geol Sci, Inst Multipurpose Utilizat Mineral Resources, Chengdu 610041, Peoples R China 5.Zijin Min Grp Co Ltd, State Key Lab Gold Extract, Shanghang 364200, Peoples R China |
| Recommended Citation GB/T 7714 | Sun, He-Yun,Tan, Qiao-Yi,Jia, Yan,et al. Pyrite oxidation in column at controlled redox potential of 900 mV with and without bacteria[J]. RARE METALS,2022,41(12):4279-4288. |
| APA | Sun, He-Yun,Tan, Qiao-Yi,Jia, Yan,Shu, Rong-Bo,Zhong, Shui-Ping,&Ruan, Ren-Man.(2022).Pyrite oxidation in column at controlled redox potential of 900 mV with and without bacteria.RARE METALS,41(12),4279-4288. |
| MLA | Sun, He-Yun,et al."Pyrite oxidation in column at controlled redox potential of 900 mV with and without bacteria".RARE METALS 41.12(2022):4279-4288. |
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