Bioleaching of chalcopyrite and bornite by moderately thermophilic bacteria: an emphasis on their interactions

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• 作者：Hong-bo Zhao ; Jun Wang ; Xiao-wen Gan…
• 关键词：chalcopyrite ; bornite ; bioleaching ; interactions ; redox potential
• 刊名：International Journal of Minerals, Metallurgy, and Materials
• 出版年：2015
• 出版时间：August 2015
• 年：2015
• 卷：22
• 期：8
• 页码：777-787
• 全文大小：2,247 KB
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• 作者单位：Hong-bo Zhao (1) (2)
  Jun Wang (1) (2)
  Xiao-wen Gan (1) (2)
  Wen-qing Qin (1) (2)
  Ming-hao Hu (1) (2)
  Guan-zhou Qiu (1) (2)
  
  1. School of Minerals Processing & Bioengineering, Central South University, Changsha, 410083, China
  2. Key Lab of Bio-hydrometallurgy of the Ministry of Education, Changsha, 410083, China
  
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Materials Science
  Metallic Materials
  Mineral Resources
  
• 出版者：Journal Publishing Center of University of Science and Technology Beijing, in co-publication with Sp
• ISSN：1869-103X

文摘

Interactions between chalcopyrite and bornite during bioleaching by moderately thermophilic bacteria were investigated mainly by X-ray diffraction, scanning electron microscopy, and electrochemical measurements performed in conjunction with bioleaching experiments. The results showed that a synergistic effect existed between chalcopyrite and bornite during bioleaching by both Acidithiobacillus caldus and Leptospirillum ferriphilum and that extremely high copper extraction could be achieved when chalcopyrite and bornite coexisted in a bioleaching system. Bornite dissolved preferentially because of its lower corrosion potential, and its dissolution was accelerated by the galvanic current during the initial stage of bioleaching. The galvanic current and optimum redox potential of 390?80 mV vs. Ag/AgCl promoted the reduction of chalcopyrite to chalcocite (Cu2S), thus accelerating its dissolution.