Abstract: In the MnO₂-FeS₂-H₂SO₄ bacterial leaching system, the effects of acidithiobacillus ferrooxidans and Fe³⁺ alone or in combination on the leaching rate of Mn²⁺ from MnO₂ were studied. The catalysis of acidithiobacillus ferrooxidans and Fe³⁺ in the system was analyzed by the cyclic voltammetric method. Acidithiobacillus ferrooxidans and Fe³⁺ alone or in combination could effectively increase leaching rate of Mn²⁺, and have some catalytic effect on the bacterial leaching process of MnO₂. Electrochemical analysis showed that acidithiobacillus ferrooxidans and Fe³⁺ alone or in combination could cause obvious redox peaks of FeS₂, and acidithiobacillus ferrooxidans could reduce the oxidation potential of FeS₂ and decrease the difference in potential between FeS₂ oxidation peak and reduction peak, thus catalyzing leaching of Mn²⁺ from MnO₂.

Key words: microbial leaching, catalytic effect, leaching rate of MnO₂, electrochemistry

摘要： 考察了MnO₂-FeS₂-H₂SO₄细菌浸出体系下，嗜酸氧化亚铁硫杆菌和Fe³⁺单独或联合对MnO₂浸出Mn²⁺的浸出速率影响，并采用循环伏安电化学方法对过程中嗜酸氧化亚铁硫杆菌与Fe³⁺的催化作用进行了分析。结果表明：嗜酸氧化亚铁硫杆菌和Fe³⁺单独或联合都可以有效提高MnO₂浸出Mn²⁺的浸出速率，对MnO₂细菌浸出过程有一定催化作用；循环伏安电化学分析表明嗜酸氧化亚铁硫杆菌和Fe³⁺单独或联合加入，都会使FeS₂出现明显的氧化还原峰，且嗜酸氧化亚铁硫杆菌可以降低FeS₂的氧化电位和缩短FeS₂氧化峰与还原峰之间的电位差，从而催化MnO₂浸出Mn²⁺的过程。

关键词: 微生物浸取, 催化作用, MnO₂的浸出速率, 电化学