Abstract: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.