(1. 长沙理工大学 化学与环境工程学院，长沙 410076；
2. 中南大学 化学化工学院，长沙 410083；
3. 中南大学 资源加工与生物工程学院，长沙 410083)
摘 要: 采用双电池系统研究了常规发电浸出过程和微生物协同发电浸出过程，考察了阳极、阴极极化，发电量、Zn2+和Fe2+的浸出率与时间的关系。结果表明，微生物协同发电浸出的浸出率和发电量比常规发电浸出的显著提高。其中，Zn2+的浸出率提高近60%，发电量增加约134%。采用电化学三电极系统研究了阳极和阴极的自腐蚀。结果表明，闪锌矿和MnO2的原电池作用在整个系统中占主导作用；微生物协同发电浸出过程中氧化亚铁硫杆菌(A.f菌)能氧化闪锌矿离解生成的单质硫，反应72 h时，生物发电比例达31.72%。
关键字: 氧化亚铁硫杆菌；发电浸出；闪锌矿
presence of A. ferrooxidans
（1. School of Chemistry and Environmental Engineering, Changsha University of Science and Technology,
Changsha 410076, China;
2. School of Chemistry and Chemical engineering, Central South University, Changsha 410083, China;
3. School of Resources Processing and Bioengineering, Central South University, Changsha 410083, China）
Abstract:A dual cell system was used to study the electrogenerative leaching for sphalerite-MnO2 in the presence of or in the absence of Acidithiobacillus ferrooxidans (A. ferrooxidans). The polarization of anode and cathode, and the relationship between the electric quantity and some factors such as the dissolved Zn2+, Fe2+, the time, were studied. The results show that the dissolved Zn2+ content in the presence of A. ferrooxidans is nearly 60% higher than that in the absence of A. ferrooxidans; the electrogenerative quantity in the former is about 134% larger than that in the latter. A three-electrode system was applied to study anodic and cathodic self-corrosion current, which was inappreciably compared with the galvanic current between sphalerite and MnO2. The accumulated sulfur on the surface of sulfides produced in the leaching process could be oxidized by A. ferrooxidans, and the ratio of biologic electric quantity reaches 31.72% within 72 h.
Key words: A. ferrooxidans; electrogenerative-leaching; sphalerite
