Cooperative effect of chalcopyrite and bornite interactions during bioleaching by mixed moderately thermophilic culture |
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| Affiliation: | 1. School of Minerals Processing & Bioengineering, Central South University, Changsha 410083, Hunan, PR China;2. Key Lab of Biohydrometallurgy of Ministry of Education, Changsha 410083, Hunan, PR China;3. School of Chemical Engineering, The University of Queensland, Brisbane, Queensland 4072, Australia;1. Department of Materials Science, International Center for Science, High Technology & Environmental Sciences, Graduate University of Advanced Technology, Kerman, Iran;2. Department of Mining Engineering, Shahid Bahonar University of Kerman, Iran;3. Department of Chemical Engineering, Shahid Bahonar University of Kerman, Iran;4. Hydrometallurgy Research Unit, Research and Development Center, Sarcheshmeh Copper Complex, Rafsanjan, Iran;1. School of Minerals Processing and Bioengineering, Central South University, Changsha 410083, China;2. Key Laboratory of Bio-hydrometallurgy of Ministry of Education, Central South University, Changsha 410083, China;1. Key Laboratory of Carbohydrate Chemistry and Biotechnology (Jiangnan University), Ministry of Education, PR China;2. The Key Laboratory of Industrial Biotechnology, Ministry of Education, PR China;3. School of Biotechnology, Jiangnan University, Wuxi, 214122, PR China;4. National Engineering Research Center for Functional Food, School of Food Science and Technology, Jiangnan University, Wuxi, Jiangsu, 214122, China |
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| Abstract: | The cooperative interactions between chalcopyrite and bornite during bioleaching by mixed moderately thermophilic culture were investigated mainly by bioleaching experiments and electrochemical experiments. Bioleaching results showed that a cooperative effect existed between chalcopyrite and bornite. When the mass ratio of chalcopyrite to bornite was 3:1, an extremely high copper extraction of more than 88% was achieved after bioleaching for 27 days. One of the major reasons for the cooperative effect was that a certain redox potential range (370–450 mV vs. Ag/AgCl) could be maintained for a long period of time during bioleaching due to the mixture of chalcopyrite and bornite. Electrochemical measurements revealed that chalcopyrite was much easier to be reduced than oxidized, while bornite was prone to be directly oxidized. Hence, galvanic effect between chalcopyrite and bornite enhanced the reduction of chalcopyrite to secondary copper-iron species and promoted the oxidative dissolution of bornite. Therefore, redox potential controlling and galvanic effect both contributed to the cooperative bioleaching of chalcopyrite and bornite. |
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| Keywords: | Chalcopyrite Bornite Redox potential Electrochemistry Bioleaching microorganism |
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