氧化亚铁硫杆菌协同闪锌矿-MnO₂的发电浸出

来源期刊：中国有色金属学报2008年增刊第1期

论文作者：王少芬 肖利 方正 邱冠周

文章页码：42 - 46

关键词：氧化亚铁硫杆菌；发电浸出；闪锌矿

Key words：A. ferrooxidans; electrogenerative-leaching; sphalerite

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%。

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.

基金信息：国家重点基础研究发展计划资助项目
国家自然科学基金资助项目