嗜酸性铁/硫杆菌浸出砂岩型铀矿协同作用研究OA

In-situ uranium leaching was investigated using native acidophilic ferrous sulfate oxidizing bacillus(Acidithiobacillus ferrooxidans,L24f)and acidophilic sulfur oxidizing bacillus(Acidithiobacillus thiooxidans,L24s)from sandstone-type uranium ore.In combination with physicochemical parameter monitoring and characterization techniques such as SEM-EDS and XRD,the synergistic leaching mechanism was elucidated to determine the effectiveness of synergistic leaching and the optimal inoculation ratio.The results show that L24f and L24s strains have a significant synergistic uranium leaching effect,and the inoculation volume ratio of 1∶1 is the optimal ratio.Under this condition,the final uranium leaching rate of sandstone-type uranium ore is 86.5％,which is 7.5 percentage points higher than that of a single L24f pure bacteria system.The mixed bacterial consortium system can maintain the low pH environment of the system through complementary metabolic functions,effectively inhibit the formation of jarosite passivation layer,and significantly improve the leaching rate of uranium.