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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 18    No. 6    December 2008

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Bacterial leaching of chalcopyrite and bornite with native bioleaching microorganism
WANG Jun(王 军), QIN Wen-qing(覃文庆), ZHANG Yan-sheng(张雁生), YANG Cong-ren(杨聪仁),
ZHANG Jian-wen(张建文), NAI Shao-shi(赖绍师), SHANG He(尚 鹤), QIU Guan-zhou(邱冠周)

Key Laboratory of Biometallurgy of Ministry of Education, School of Minerals Processing and Bioengineering,
Central South University, Changsha 410083, China

Abstract:A native mesophilic iron-oxidizing bacterium, Acidithiobacillus ferrooxidans, has been isolated (30 ℃) from a typical, lead-zinc concentrate of Dachang Mine in the region of Liuzhou located in the southwest of China. Two typical copper sulfide minerals, chalcopyrite and bornite, were from Meizhou Copper Mine in the region of Guangdong Province, China. Variation of pH and cell growth on time and effects of some factors such as temperature, inoculation cell number, and pulp density on the bioleaching of chalcopyrite and bornite were investigated. The results obtained from the bioleaching experiments indicate that the efficiency of copper extraction depends on all of the mentioned variables, especially the pulp density has more effect than the other factors on the microorganism. In addition, the results show that the maximum copper recovery was achieved using a mesophilic culture. The copper dissolution reached 51.34% for the chalcopyrite while it was 72.35% for the bornite at pH 2.0, initial Fe(Ⅱ) concentration 9 g/L and pulp density 5%, after 30 d.

 

Key words: bornite; Acidithiobacillus ferrooxidans; bioleaching; chalcopyrite

ISSN 1672-7029
CN 43-1423/U

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