CAS OpenIR
Contributions of Microbial "Contact Leaching" to Pyrite Oxidation under Different Controlled Redox Potentials
Dong, Bingxu1,2,3; Jia, Yan1,2; Tan, Qiaoyi1,2,4; Sun, Heyun1,2; Ruan, Renman1,2,4
2020-10-01
Source PublicationMINERALS
Volume10Issue:10Pages:16
AbstractThe function of microbial contact leaching to pyrite oxidation was investigated by analyzing the differences of residue morphologies, leaching rates, surface products, and microbial consortia under different conditions in this study. This was achieved by novel equipment that can control the redox potential of the solution and isolate pyrite from microbial contact oxidation. The morphology of residues showed that the corrosions were a little bit severer in the presence of attached microbes under 750 mV and 850 mV (vs. SHE). At 650 mV, the oxidation of pyrite was undetectable even in the presence of attached microbes. The pyrite dissolution rate was higher with attached microbes than that without attached microbes at 750 mV and 850 mV. The elemental sulfur on the surface of pyrite residues with sessile microorganisms was much less than that without attached microbes at 750 mV and 850 mV, showing that sessile acidophiles may accelerate pyrite leaching by reducing the elemental sulfur inhibition. Many more sulfur-oxidizers were found in the sessile microbial consortium which also supported the idea. The results suggest that the microbial "contact leaching" to pyrite oxidation is limited and relies on the elimination of elemental sulfur passivation by attached sulfur-oxidizing microbes rather than the contact oxidation by EPS-Fe.
Keywordpyrite bioleaching contact leaching controlled redox potential elemental sulfur inhibition microbial consortium
DOI10.3390/min10100856
Language英语
WOS KeywordTHIOBACILLUS-FERROOXIDANS ; SURFACE-PROPERTIES ; SULFUR-COMPOUNDS ; FAM. NOV. ; GEN. NOV. ; KINETICS ; IRON ; MECHANISM ; MICROORGANISMS ; CHALCOPYRITE
Funding ProjectNational Natural Science Foundation of China[51674231] ; Key Research Program of Chinese Academy of Sciences[ZDRW-ZS-2018-1] ; Innovation Academy for Green Manufacture, Chinese Academy of Sciences[IAGM-2019A08]
WOS Research AreaMineralogy ; Mining & Mineral Processing
WOS SubjectMineralogy ; Mining & Mineral Processing
Funding OrganizationNational Natural Science Foundation of China ; Key Research Program of Chinese Academy of Sciences ; Innovation Academy for Green Manufacture, Chinese Academy of Sciences
WOS IDWOS:000586273300001
PublisherMDPI
Citation statistics
Document Type期刊论文
Identifierhttp://ir.ipe.ac.cn/handle/122111/42523
Collection中国科学院过程工程研究所
Corresponding AuthorRuan, Renman
Affiliation1.Chinese Acad Sci, Inst Proc Engn, CAS Key Lab Green Proc & Engn, Beijing 100190, Peoples R China
2.Chinese Acad Sci, Natl Engn Lab Hydromet Cleaner Prod Technol, Beijing 100190, Peoples R China
3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
4.Chinese Acad Sci, State Key Lab Biochem Engn, Inst Proc Engn, Beijing 100190, Peoples R China
Recommended Citation
GB/T 7714
Dong, Bingxu,Jia, Yan,Tan, Qiaoyi,et al. Contributions of Microbial "Contact Leaching" to Pyrite Oxidation under Different Controlled Redox Potentials[J]. MINERALS,2020,10(10):16.
APA Dong, Bingxu,Jia, Yan,Tan, Qiaoyi,Sun, Heyun,&Ruan, Renman.(2020).Contributions of Microbial "Contact Leaching" to Pyrite Oxidation under Different Controlled Redox Potentials.MINERALS,10(10),16.
MLA Dong, Bingxu,et al."Contributions of Microbial "Contact Leaching" to Pyrite Oxidation under Different Controlled Redox Potentials".MINERALS 10.10(2020):16.
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