Sulfur speciation transformation during bioleaching of pyrite-containing sphalerite concentrate by thermophile Sulfolobus metallicus at 65 °C  

作　　者：夏金兰 赵小娟 梁长利 杨益 聂珍媛 汤露 马陈燕 郑雷 赵屹东 邱冠周 

机构地区：[1]Key Laboratory of Biometallurgy of Ministry of Education(Central South University) [2]School of Minerals Processing and Bioengineering,Central South University [3]Beijing Synchrotron Radiation Facility,Institute of High Energy Physics,Chinese Academy of Sciences

出　　处：《Journal of Central South University》2012年第7期1961-1966,共6页中南大学学报（英文版）

基　　金：Project(50974140) supported by the National Natural Science Foundation of China;Project(VR-09157) supported by Beijing Synchrotron Radiation Facility (BSRF) Public User Program,China

摘　　要：Sulfur speciation transformation during bioleaching of pyrite-containing sphalerite concentrate by thermophile Sulfolobus metallicus （S. metallicus） at 65 ℃ was investigated by X-ray diffraction （XRD）, diffuse reflectance Fourier transform infrared spectroscopy （FT-IR） and sulfur K-edge X-ray absorption near edge structure spectroscopy （XANES）. The results show that the presence of S. metallicus effectively enhances the dissolution of the mineral. The yield of zinc increases from 0.5 g/L in sterile control to 2.7 g/L in bioleaching. The pyrite in the concentrate facilitates zinc dissolution in the early stage, but has hindrance role in the late stage for the formation of jarosite. Sulfur speciation analyses show that jarosite and elemental sulfur are main products in bioleaching process, and the accumulation ofjarosite is mainly responsible for the decline of leaching efficiency.Sulfur speciation transformation during bioleaching of pyrite-containing sphalerite concentrate by thermophile Sulfolobus metallicus (S.metallicus) at 65 °C was investigated by X-ray diffraction (XRD),diffuse reflectance Fourier transform infrared spectroscopy (FT-IR) and sulfur K-edge X-ray absorption near edge structure spectroscopy (XANES).The results show that the presence of S.metallicus effectively enhances the dissolution of the mineral.The yield of zinc increases from 0.5 g/L in sterile control to 2.7 g/L in bioleaching.The pyrite in the concentrate facilitates zinc dissolution in the early stage,but has hindrance role in the late stage for the formation of jarosite.Sulfur speciation analyses show that jarosite and elemental sulfur are main products in bioleaching process,and the accumulation of jarosite is mainly responsible for the decline of leaching efficiency.

关 键 词：SPHALERITE BIOLEACHING Sulfolobus metallicus sulfur K-edge X-ray absorption near edge spectroscopy （XANES） sulfurspeciation transformation 

分 类 号：TD951[矿业工程—选矿]