(1. 長(zhǎng)沙理工大學(xué) 化學(xué)與環(huán)境工程學(xué)院，長(zhǎng)沙 410076；
2. 中南大學(xué) 化學(xué)化工學(xué)院，長(zhǎng)沙 410083；
3. 中南大學(xué) 資源加工與生物工程學(xué)院，長(zhǎng)沙 410083)
摘 要: 采用雙電池系統(tǒng)研究了常規(guī)發(fā)電浸出過(guò)程和微生物協(xié)同發(fā)電浸出過(guò)程，考察了陽(yáng)極、陰極極化，發(fā)電量、Zn2+和Fe2+的浸出率與時(shí)間的關(guān)系。結(jié)果表明，微生物協(xié)同發(fā)電浸出的浸出率和發(fā)電量比常規(guī)發(fā)電浸出的顯著提高。其中，Zn2+的浸出率提高近60%，發(fā)電量增加約134%。采用電化學(xué)三電極系統(tǒng)研究了陽(yáng)極和陰極的自腐蝕。結(jié)果表明，閃鋅礦和MnO2的原電池作用在整個(gè)系統(tǒng)中占主導(dǎo)作用；微生物協(xié)同發(fā)電浸出過(guò)程中氧化亞鐵硫桿菌(A.f菌)能氧化閃鋅礦離解生成的單質(zhì)硫，反應(yīng)72 h時(shí)，生物發(fā)電比例達(dá)31.72%。
關(guān)鍵字: 氧化亞鐵硫桿菌；發(fā)電浸出；閃鋅礦
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
