Contributions of Microbial "Contact Leaching" to Pyrite Oxidation under Different Controlled Redox Potentials

doi:10.3390/min10100856

	Contributions of Microbial "Contact Leaching" to Pyrite Oxidation under Different Controlled Redox Potentials
	Dong, Bingxu 1,3,4; Jia, Yan 1,3; Tan, Qiaoyi 1,2,3; Sun, Heyun 1,3; Ruan, Renman 1,2,3
刊名	MINERALS
	2020-10-01
卷号	10 期号:10 页码:16
关键词	pyrite bioleaching contact leaching controlled redox potential elemental sulfur inhibition microbial consortium
DOI	10.3390/min10100856
英文摘要	The 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.
资助项目	National 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关键词	THIOBACILLUS-FERROOXIDANS ; SURFACE-PROPERTIES ; SULFUR-COMPOUNDS ; FAM. NOV. ; GEN. NOV. ; KINETICS ; IRON ; MECHANISM ; MICROORGANISMS ; CHALCOPYRITE
WOS研究方向	Mineralogy ; Mining & Mineral Processing
语种	英语
出版者	MDPI
WOS记录号	WOS:000586273300001
资助机构	National Natural Science Foundation of China ; Key Research Program of Chinese Academy of Sciences ; Innovation Academy for Green Manufacture, Chinese Academy of Sciences
内容类型	期刊论文
源URL	[http://ir.ipe.ac.cn/handle/122111/42522]
专题	中国科学院过程工程研究所
通讯作者	Ruan, Renman
作者单位	1.Chinese Acad Sci, Natl Engn Lab Hydromet Cleaner Prod Technol, Beijing 100190, Peoples R China 2.Chinese Acad Sci, State Key Lab Biochem Engn, Inst Proc Engn, Beijing 100190, Peoples R China 3.Chinese Acad Sci, Inst Proc Engn, CAS Key Lab Green Proc & Engn, Beijing 100190, Peoples R China 4.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
推荐引用方式 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.