氧化亚铁硫杆菌对黄铜矿表面性质及其浸出的影响  

Effects of Acidithiobacillus ferrooxidans on surface properties of chalcopyrite and bioleaching

作　　者：顾帼华[1] 陈明莲[1] 苏丽君[1] 李建华[1] 胡岳华[1] 邱冠周[1] 

机构地区：[1]中南大学资源加工与生物工程学院,湖南长沙410083

出　　处：《中南大学学报（自然科学版）》2010年第3期807-812,共6页Journal of Central South University:Science and Technology

基　　金：国家自然科学基金资助项目(50621063);国家重点基础研究研发项目(2004CB619204)

摘　　要：通过测定吸附量、Zeta电位和接触角,并通过对原子力显微镜表面进行表征及摇瓶浸出试验考察不同能源(Fe2+、单质硫和黄铜矿)培养的氧化亚铁硫杆菌A.ferrooxidans对黄铜矿表面性质的影响及其与黄铜矿浸出的关系。研究结果表明:不同能源培养的A.ferrooxidans菌对黄铜矿表面性质的影响规律相似;A.ferrooxidans菌均能快速吸附在黄铜矿表面,而矿驯化的A.ferrooxidans菌在矿表面的附着能力更强;细菌的吸附使黄铜矿的等电点朝细菌的等电点方向偏移,且由于在黄铜矿表面生成了硫膜和不稳定铜硫化物使得黄铜矿表面接触角增大,疏水性增强;在浸矿初期,细菌与黄铜矿作用以直接作用机理为主。Effects of Acidithiobacillus ferrooxidans cultured on different energy resources （Fe2＋,sulfur and chalcopyrite） on surface properties of chalcopyrite and bioleaching were evaluated by Zeta-potential,adsorption studies,contact angle measurement and atomic force microscope （AFM） images. The results show that after conditioning with bacterium cultured on different energy resources,the change trends of surface properties of chalcopyrite are similar. All types of A.ferrooxidans adhere to chalcopyrite surface rapidly,but adapted A.ferrooxidans has stronger adsorption ability. The isoelectric point of chalcopyrite after bacterial treatment moves towards the isoelectric point of pure cells. Due to the formation of elemental sulfur and intermediate copper sulphides on chalcopyrite surface,the contact angle and surface hydrophobicity of chalcopyrite increase. The direct mechanism of sulfide oxidation is essential in initial bioleaching.

关 键 词：黄铜矿 氧化亚铁硫杆菌 微生物浸出 吸附 

分 类 号：TF18[冶金工程—冶金物理化学]