沥青铀矿石硫酸和细菌浸出过程的比较研究

以沥青铀矿石为对象,进行了10g/L、20g/L硫酸浸出和上述两种条件酸化后的细菌浸出试验。结果表明,上述四种条件下铀浸出率分别为20.86%、26.47%、30.29%和35.53%,细菌可以有效氧化浸出体系中的元素硫和Fe2+,使pH、Eh、亚铁离子浓度、总铁浓度等特征参数朝着有利于铀矿石浸出的方向变化;在同等条件下,细菌浸出的浸出率比硫酸浸出的提高了34.8%～45.2%。

Comparative Study on Leaching Process of Sulphuric Acid and Bacterial Leaching of Uraninite Ores

Uraninite ores were taken as the experimental object. Four kinds of leaching experiments were conducted, including the acid leaching with sulphuric acid concentration of 10 g/L and 20 g/L, and the bacteria leaching after acidification with sulphuric acid concentration of 10 g/L and 20 g/L. The results show that the uranium leaching rates of above four leaching systems are 20.86%, 26.47%, 30.29% and 35.53% respectively. The elemental sulfur and ferrous ions in the leaching solution are oxidized effectively by bacterium and the characteristic parameters of pH value, redox potential, ferrous ion concentration, and total iron concentration are changed to the benefit of leaching for uraninite ore. Under the same conditions, the leaching rates of bacterial leaching system increase by 34.8%~45.2% than those of sulphuric acid leaching.