Bioleaching of chalcopyrite and bornite by moderately thermophilic bacteria: an emphasis on their interactions
来源期刊：International Journal of Minerals Metallurgy and Materials2015年第8期
论文作者：Hong-bo Zhao Jun Wang Xiao-wen Gan Wen-qing Qin Ming-hao Hu Guan-zhou Qiu
文章页码：777 - 787
摘 要：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 390-480 m V vs. Ag/Ag Cl promoted the reduction of chalcopyrite to chalcocite（Cu2S）, thus accelerating its dissolution.
Hong-bo Zhao1,2，Jun Wang1,2，Xiao-wen Gan1,2，Wen-qing Qin1,2，Ming-hao Hu1,2，Guan-zhou Qiu1,2
1. School of Minerals Processing & Bioengineering, Central South University2. Key Lab of Bio-hydrometallurgy of the Ministry of Education
摘 要：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 390-480 m V vs. Ag/Ag Cl promoted the reduction of chalcopyrite to chalcocite（Cu2S）, thus accelerating its dissolution.
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