Comparative study on the bioleaching of zinc sulphides

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	Comparative study on the bioleaching of zinc sulphides
	Shi, SY ; Fang, ZH ; Ni, JR
刊名	PROCESS BIOCHEMISTRY
	2006-02-01
卷号	41 期号:2 页码:438-446
关键词	zinc sulphides bacterial strains bioleaching electrochemistry
ISSN号	1359-5113
其他题名	Process Biochem.
中文摘要	Bioleaching processes of three zinc sulphides (marmatite, sphalerite and ZnS synthetically prepared) with Acidithiobacillus ferrooxidans and a moderately thermoacidophilic iron-oxidizing bacterium (MLY) were investigated by leaching experiments and electrochemical methods. Experimental results showed that marmatite had the highest dissolution rate in the presence of bacterial strains among the three zinc sulphides due to the difference of physicochemical property. Compared with synthetic ZnS, the part iron existed as pyrite contained in two concentrates and the dissolution of zinc sulphides was accelerated for galvanic cell effect. More Fe existed in the crystal lattice of marmatite solid solution were released to liquid phase and oxidized into Fe3+ ions by bacterial strains to accelerate the dissolution of marmatite during the bioleaching process. The bacterial leaching of zinc sulphides could become diffusion controlled when insufficient bacterial oxidation of the sulphur layer occurred, especially in the more rapid marmatite leaching reaction. The zinc sulphides bioleaching was significantly affected by mineralogical properties and leach solutions, which was supported by electrochemical measurements based on the working electrode of zinc sulphides-carbon paste electrode. The marmatite concentrate was more suitable for the extraction of zinc by the microbial leaching, when compared with the sphalerite and synthetic ZnS. (c) 2005 Elsevier Ltd. All rights reserved.
英文摘要	Bioleaching processes of three zinc sulphides (marmatite, sphalerite and ZnS synthetically prepared) with Acidithiobacillus ferrooxidans and a moderately thermoacidophilic iron-oxidizing bacterium (MLY) were investigated by leaching experiments and electrochemical methods. Experimental results showed that marmatite had the highest dissolution rate in the presence of bacterial strains among the three zinc sulphides due to the difference of physicochemical property. Compared with synthetic ZnS, the part iron existed as pyrite contained in two concentrates and the dissolution of zinc sulphides was accelerated for galvanic cell effect. More Fe existed in the crystal lattice of marmatite solid solution were released to liquid phase and oxidized into Fe3+ ions by bacterial strains to accelerate the dissolution of marmatite during the bioleaching process. The bacterial leaching of zinc sulphides could become diffusion controlled when insufficient bacterial oxidation of the sulphur layer occurred, especially in the more rapid marmatite leaching reaction. The zinc sulphides bioleaching was significantly affected by mineralogical properties and leach solutions, which was supported by electrochemical measurements based on the working electrode of zinc sulphides-carbon paste electrode. The marmatite concentrate was more suitable for the extraction of zinc by the microbial leaching, when compared with the sphalerite and synthetic ZnS. (c) 2005 Elsevier Ltd. All rights reserved.
WOS标题词	Science & Technology ; Life Sciences & Biomedicine ; Technology
类目[WOS]	Biochemistry & Molecular Biology ; Biotechnology & Applied Microbiology ; Engineering, Chemical
研究领域[WOS]	Biochemistry & Molecular Biology ; Biotechnology & Applied Microbiology ; Engineering
关键词[WOS]	MARMATITE FLOTATION CONCENTRATE ; THIOBACILLUS-FERROOXIDANS ; BACTERIAL OXIDATION ; ACIDITHIOBACILLUS-FERROOXIDANS ; THERMOPHILIC BACTERIA ; DISSOLUTION ; SPHALERITE ; MECHANISM ; KINETICS ; IRON
收录类别	SCI
原文出处	://WOS:000234624200026
语种	英语
WOS记录号	WOS:000234624200026
公开日期	2013-10-24
内容类型	期刊论文
版本	出版稿
源URL	[http://ir.ipe.ac.cn/handle/122111/3939]
专题	过程工程研究所_研究所（批量导入）
作者单位	1.Peking Univ, Inst Environm Engn, Beijing 100871, Peoples R China 2.Chinese Acad Sci, Inst Proc Engn, Beijing 100080, Peoples R China
推荐引用方式 GB/T 7714	Shi, SY,Fang, ZH,Ni, JR. Comparative study on the bioleaching of zinc sulphides[J]. PROCESS BIOCHEMISTRY,2006,41(2):438-446.
APA	Shi, SY,Fang, ZH,&Ni, JR.(2006).Comparative study on the bioleaching of zinc sulphides.PROCESS BIOCHEMISTRY,41(2),438-446.
MLA	Shi, SY,et al."Comparative study on the bioleaching of zinc sulphides".PROCESS BIOCHEMISTRY 41.2(2006):438-446.