Oxidation of chalcopyrite by Acidithiobacillus ferrooxidans and Acidithiobacillus thiooxidans in shake flasks

被引:119
作者
Bevilaqua, D
Leite, ALLC
Garcia, O
Tuovinen, OH
机构
[1] Sao Paulo State Univ, Inst Chem, Dept Biochem & Chem Technol, BR-14801970 Araraquara, SP, Brazil
[2] Ohio State Univ, Dept Microbiol, Columbus, OH 43210 USA
基金
巴西圣保罗研究基金会;
关键词
Acidithiobacillus; chalcopyrite leaching; iron oxidation; sulphur oxidation;
D O I
10.1016/S0032-9592(02)00169-3
中图分类号
Q5 [生物化学]; Q7 [分子生物学];
学科分类号
071010 ; 081704 ;
摘要
Chalcopyrite oxidation was evaluated with two acidophilic thiobacilli that are important in bioleaching processes. Acidithiobacillus thiooxidans in pure culture did not oxidize CuFeS2 but oxidized externally added S in the presence of CuFeS2. Acidithiobacillus ferrooxidans released Cu2+ and soluble Fe from chalcopyrite, and the time course lead to a gradual passivation of chalcopyrite whereby Cu2+ dissolution leveled off. Fe3+ acted as a chemical oxidant in CuFeS2 leaching and was reduced to Fe2+. Parallel bacterial re-oxidation of Fe2+ contributed to a high Fe3+/Fe2+ ratio and an increase in redox potential. Chemical oxidation of chalcopyrite was slow compared with A. ferrooxidans-initiated solubilization. X-ray analysis revealed new solid phases: (i) jarosite, found in solids from A. ferrooxidans cultures and in chemical controls that initially received Fe2+ or Fe3+, and (ii) S-0, found mostly in iron-amended A. ferrooxidans culture and the corresponding chemical controls. (C) 2002 Elsevier Science Ltd. All rights reserved.
引用
收藏
页码:587 / 592
页数:6
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