Abstract:In order to explore the influence law and mechanism of different influencing factors on CO2+O2 in-situ leaching effect of uranium deposits, firstly, a multi-field coupling numerical model of seepage-chemistry-stress suitable for CO2+O2 in-situ leaching was established, and then, combined with the actual site conditions, the numerical simulation study of the influences of liquid injection rate, permeability, O2 addition concentration, HCO3- addition concentration, and uranium ore average grade on CO2+O2 in-situ leaching uranium were carried out. The results show that during the CO2+O2 in-situ leaching process, uranium concentration in pumped well indicates a phased change trend of "slow rise, rapid rise, slow decline, and stabilize". The permeability of ore seam, average grade of uranium ore, O2 addition concentration, and HCO3- addition concentration show a positive linear correlation with uranium concentration of pumping well, and the injection rate of leaching solution shows a negative linear correlation with uranium concentration of pumping well. During the CO2+O2 in-situ leaching process, uranium deposits with large initial permeability and high uranium grade should be selected, the concentration of O2 and HCO3- should be appropriately increased, and the injection rate of leaching solution should be controlled to achieve efficient exploitation of uranium resources. This study has important guiding significance for site selection and parameter optimization of CO2+O2 in-situ leaching process.