Intensified Bioleaching of Copper from Chalcopyrite: Decoupling and Optimization of the Chemical Stage
- سال انتشار: 1399
- محل انتشار: Iranian Journal of Chemistry and Chemical Engineering، دوره: 39، شماره: 5
- کد COI اختصاصی: JR_IJCCE-39-5_029
- زبان مقاله: انگلیسی
- تعداد مشاهده: 75
نویسندگان
Biotechnology Research Center, Faculty of Chemical Engineering, Sahand University of Technology, P.O. Box ۵۱۳۳۵-۱۹۹۶ Tabriz, I.R. IRAN
Biotechnology Research Center, Faculty of Chemical Engineering, Sahand University of Technology, P.O. Box ۵۱۳۳۵-۱۹۹۶ Tabriz, I.R. IRAN
Mining Engineering Faculty, Sahand University of Technology, P.O. Box ۵۱۳۳۵-۱۹۹۶ Tabriz, I.R. IRAN
Biobased Monomers and Polymers Division, Iran Polymer and Petrochemical Institute (IPPI), P.O. Box ۱۴۹۷۵-۱۱۵ Tehran, I.R. IRAN
چکیده
A one-stage process for the bioleaching of copper from chalcopyrite has a low leaching rate compared to the conventional smelting, pressure oxidation, and roasting routes, thus reducing the economic viability of the process. It is, therefore, crucial to optimize the process and the associated rate-influencing factors to make it competitive with the traditional, proven technologies. A strategy to intensify the extraction process is the decoupling of the chemical and biological stages, which expands the attainable region for the optimization of the variables. In the present research, the decoupled optimization of the chemical stage in the copper bioleaching of a chalcopyrite ore from the Iranian Sungun mine at East Azerbaijan was investigated. The factors affecting the rate of oxidation of chalcopyrite were determined and optimized with a (realistic) priori prepared bio-related medium. The optimized variables included the reaction temperature of ۷۰ °C, the ore particle size of ۰.۶۵ μm, pH of ۱.۸ in the leaching solution, ferric ion concentration of ۰.۱ of the stoichiometric value (۰.۰۰۲۲ mol per gram of chalcopyrite), and redox potential ~۴۰۶ mV. Overall, the effect of redox potential on the extraction rate was the most pronounced such that the leaching rate was increased by about three times in the potential range of ۴۰۱.۰–۴۰۵.۸ mV relative to other ranges.کلیدواژه ها
Process optimization, Bioleaching, ferrous sulfate, chalcopyrite, copper sulfideاطلاعات بیشتر در مورد COI
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