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

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

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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 bothAcidithiobacillus 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 gal-vanic current during the initial stage of bioleaching. The galvanic current and optimum redox potential of 390?480 mV vs. Ag/AgCl pro-moted the reduction of chalcopyrite to chalcocite (Cu2S), thus accelerating its dissolution.

chalcopyritebornitebioleachinginteractionsredox potential

Hong-bo Zhao、Jun Wang、Xiao-wen Gan、Wen-qing Qin、Ming-hao Hu、Guan-zhou Qiu

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School of Minerals Processing & Bioengineering, Central South University, Changsha 410083, China

This work was financially supported by the National Natural Science Foundation of ChinaThis work was financially supported by the National Natural Science Foundation of ChinaProgram for New Century Excellent Talents in UniversityChina Postdoctoral Science Foundation

5137424851320105006NCET-13-05952014T70692

2015

10.1007/s12613-015-1134-7

矿物冶金与材料学报
北京科技大学

矿物冶金与材料学报

CSCDSCIEI
影响因子：0.609
ISSN：1674-4799
年,卷(期)：2015.(8)
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