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The concentration of uranium in the rock sample was 35.0 μg/g, the concentration ratio of CO2 and O2 injected was 1:1, the autoclaves pressure was 0.02 MPa. The uranium leaching rate varied from 28.70 to 37.97%, and when the concentration of HCO3− is lower, the output rate of U is significantly increased as it increases, when its concentration exceeds the threshold value, U’s output concentration is no longer infinitely increased. Calcite and dolomite were saturated and precipitated during the leaching process due to the high initial pH; with the injection of CO2, calcite and dolomite remained near- or under-saturated and did not precipitate. [ABSTRACT FROM AUTHOR]