Stepwise dissolution of chalcopyrite bioleaching by thermophile A.manzaensis and mesophile L. ferriphilum  

作　　者：顾帼华 熊先学 胡可婷 李双棵 王重庆 

机构地区：[1]School of Mineral Processing and Bioengineering, Central South University [2]School of Chemistry and Chemical Engineering, Central South University

出　　处：《Journal of Central South University》2015年第10期3751-3759,共9页中南大学学报（英文版）

基　　金：Project(2010CB630903)supported by National Basic Research Program of China;Project(51374249)supported by the National Natural Science Foundation of China

摘　　要：Chalcopyrite dissolution was evaluated by bioleaching and electrochemical experiments with thermophile A. manzaensis（Acidianus manzaensis） and mesophile L. ferriphilum（Leptospirillum ferriphium） cultures at 65 ℃ and 40 ℃, respectively. It was investigated that the bioleaching of chalcopyrite was stepwise. It was reduced to Cu2 S at a lower redox potential locating in the whole bioleaching process by A. manzaensis at high temperature while only at initial days of bioleaching by L. ferriphilum at a relative low temperature. No reduced product was detected when the redox potential was beyond a high level（e.g., 550 m V（vs SCE）） bioleached by L. ferriphilum. Chalcopyrite bioleaching efficiency was substantially improved bioleached by A. manaensis compared to that by L. ferriphilum, which was mainly attributed to the reduction reaction occurring during bioleaching. The reductive intermediate Cu2 S was more amenable to oxidation than chalcopyrite, causing enhanced copper extraction.Chalcopyrite dissolution was evaluated by bioleaching and electrochemical experiments with thermophile A. manzaensis(Acidianus manzaensis) and mesophile L. ferriphilum(Leptospirillum ferriphium) cultures at 65 °C and 40 °C, respectively. It was investigated that the bioleaching of chalcopyrite was stepwise. It was reduced to Cu2 S at a lower redox potential locating in the whole bioleaching process by A. manzaensis at high temperature while only at initial days of bioleaching by L. ferriphilum at a relative low temperature. No reduced product was detected when the redox potential was beyond a high level(e.g., 550 m V(vs SCE)) bioleached by L. ferriphilum. Chalcopyrite bioleaching efficiency was substantially improved bioleached by A. manaensis compared to that by L. ferriphilum, which was mainly attributed to the reduction reaction occurring during bioleaching. The reductive intermediate Cu2 S was more amenable to oxidation than chalcopyrite, causing enhanced copper extraction.

关 键 词：CHALCOPYRITE Acidianus manzaensis Leptospirillum ferriphilum BIOLEACHING ELECTROCHEMISTRY 

分 类 号：TF18[冶金工程—冶金物理化学]