微生物浸出MnO_2过程中嗜酸氧化亚铁硫杆菌与Fe^(3+)的催化作用

Catalytic effect of acidithiobacillus ferrooxidans and Fe^(3+) on microbial leaching process of MnO_2

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。

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.