Electro-generative mechanism for simultaneous leaching of pyrite and MnO₂ in presence of A. ferrooxidans

来源期刊：中国有色金属学报(英文版)2007年第6期

论文作者：肖利 方正 邱冠周 柳建设

文章页码：1373 - 1378

Key words：pyrite; MnO₂; bio-oxidation; simultaneous leaching; electro-generation

Abstract: 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.

基金信息：the Major State Basic Research Development Program of China
the National Natural Science Foundation of China
the Education Department Foundation of Hunan Province, China