生物浸出中黄铜矿与铁离子间的相互影响 - 中南大学学报.pdf

46 9 ( ) Vol.46 No.9 2015 9 Journal of Central South University (Science and Technology) Sep. 2015 DOI: 10.11817/j.issn.1672-7207.2015.09.002 ( 100088) pH (SEM-EDS)X (XRD) Fe2+Fe3+ (ρ(Fe2+):ρ(Fe3+)=1:1)Fe2+ Fe2+ Fe3+ Fe3+Fe2+ TF18 TF803.21 A 1672−7207(2015)09−3176−07 Interaction between iron ion and chalcopyrite in bioleaching MENG Chunyu, LIU Wenyan, LIU Xingyu, CHEN Bowei, WEN Jiankang (National Engineering Laboratory of Biohydrometallurgy, General Research Institute for Nonferrous Metals, Beijing 100088, China) Abstract: The bioleaching of chalcopyrite with iron ion was studied in different reaction systems in the presence of moderately thermophilic and facultative autotrophic bacteria by analyzing the variation of pH, oxidation-reduction potential and the mass concentration of iron and cupric ion during the reaction process. The residue was also observed by scanning electron microscope and energy dispersive spectrometer (SEM-EDS), and analyzed by X-ray diffraction (XRD). Furthermore, the mutual influences between chalcopyrite and iron ions were analyzed. The results show that the oxidation rate of Fe2+ and the value of redox potential increase dramatically after adding chalcopyrite into the solution containing the same mass concentration of Fe2+ and Fe3+ (ρ(Fe2+):ρ(Fe3+)=1:1). Almost all Fe2+ are oxidized in relatively a short period of time. The chalcopyrite enhances the formation of precipitates of Fe3+. Iron ions play an impor