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 | |
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. |
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