Electro-generative mechanism for simultaneous leaching of pyrite and MnO_2 inpresence of A. ferrooxidans  

作　　者：肖利 方正 邱冠周 柳建设 

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

出　　处：《中国有色金属学会会刊：英文版》2007年第6期1373-1378,共6页Transactions of Nonferrous Metals Society of China

基　　金：Project(2004CB619204) supported by the Major State Basic Research Development Program;Project(50374077) supported by the National Natural Science Foundation of China;Project(07D069) supported by the Education Department Foundation of Hunan Province, China

摘　　要：A dual cell system was used to study the output power, output voltage, galvanic polarization of anode and cathode, and the relationship between the electric quantity(Q) and some factors, such as the dissolved Fe2+ magnitude, the time in the electro- generative simultaneous leaching with bacteria(BEGSL) and without bacteria(EGSL). A three-electrode system was adopted to study their individual self-corrosion current, which was smaller compared with the galvanic current. The results show that the output power and voltage in BEGSL are higher than those in EGSL. The accumulated sulfur on the surface of sulfides produced in BEGSL can be oxidized by A. ferrooxidans, and the ratio of biologic electric quantity reaches 51.50% in 72 h. The first stage both in EGSL and in BEGSL is the dissolution of pyrite on the surface to ferrous ion and sulfur element, which was oxidized by A. ferrooxidans in the further procedure.A dual cell system was used to study the output power, output voltage, galvanic polarization of anode and cathode, and the relationship between the electric quantity（Q） and some factors, such as the dissolved Fe2＋ magnitude, the time in the electro- generative simultaneous leaching with bacteria（BEGSL） and without bacteria（EGSL）. A three-electrode system was adopted to study their individual self-corrosion current, which was smaller compared with the galvanic current. The results show that the output power and voltage in BEGSL are higher than those in EGSL. The accumulated sulfur on the surface of sulfides produced in BEGSL can be oxidized by A. ferrooxidans, and the ratio of biologic electric quantity reaches 51.50% in 72 h. The first stage both in EGSL and in BEGSL is the dissolution of pyrite on the surface to ferrous ion and sulfur element, which was oxidized by A. ferrooxidans in the further procedure.

关 键 词：黄铁矿 二氧化锰 生物氧化 偏振 

分 类 号：TQ153[化学工程—电化学工业]