Abstract:Through column leaching experiment in laboratory, Leaching rules of metal ions and uranium during bioleaching of uranium ore with different particle sizes (2.5-5, 5-10, 2.5-10 mm) were analyzed. Leaching behaviors of K+, Ca2+, Na+, Mg2+, Al3+, Fe3+ and uranium were analyzed. Saturation index of metal ions and existing form of uranium in leaching solution were calculated by PHREEQC. The results show that leaching trend of K+, Ca2+, Na+, Mg2+, Al3+, Fe3+ in uranium ore is similar to that of uranium. The smaller the particle size is, the more metal ions are leached from igneous rock uranium ore. After 66 days of column leaching experiment, uranium leaching rates of three sizes of uranium ore are 85.93%, 69.75% and 79.65%, respectively. Anhydrite is saturated in acidification stage and bacterial leaching stage, uranyl phosphate is saturated in acidification stage, and ferric fluoride is saturated in bacterial leaching stage. Uranium in leaching solution of column leaching mainly exists in form of positive hexavalent. Chemical forms of uranium in acidification stage are mainly uranyl sulfate and uranyl phosphate, and mainly uranyl sulfate and uranyl fluoride in bacteria leaching stage.