Stepwise dissolution of chalcopyrite bioleaching bythermophile A.manzaensis and mesophile L. ferriphilum
来源期刊：中南大学学报(英文版)2015年第10期
论文作者：GU Guo-hua XIONG Xian-xue HU Ke-ting LI Shuang-ke WANG Chong-qing
文章页码：3751 - 3759
Key words：chalcopyrite; Acidianus manzaensis; Leptospirillum ferriphilum; bioleaching; electrochemistry
Abstract: 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 Cu2S 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 mV (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 Cu2S was more amenable to oxidation than chalcopyrite, causing enhanced copper extraction.
GU Guo-hua(顾帼华)1, XIONG Xian-xue(熊先学)1, HU Ke-ting(胡可婷)1, LI Shuang-ke(李双棵)1, WANG Chong-qing(王重庆)2
(1. School of Mineral Processing and Bioengineering, Central South University, Changsha 410083, China;
2. School of Chemistry and chemical Engineering, Central South University, Changsha 410083, China)
Abstract: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 Cu2S 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 mV (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 Cu2S was more amenable to oxidation than chalcopyrite, causing enhanced copper extraction.
Key words:chalcopyrite; Acidianus manzaensis; Leptospirillum ferriphilum; bioleaching; electrochemistry
