Abstract:The problem of radioactive contamination of the soil around the mine poses a threat to the ecological environment and human health, and it is urgent to study the efficient remediation technology of uranium contaminated soil. Taking the radioactive contaminated soil in a uranium mining area as the research object to explore the optimal process parameters for uranium removal with different leaching solvent types, leaching solvent concentrations, liquid-solid ratio and compound leaching solvent ratio. The results show that there are significant differences in the removal performance of uranium from uranium contaminated soil by chemical leaching solvents, which is inorganic acid (48.70%) > organic acid (31.91%)> chelating agent (23.31%) > inorganic salts (17.26%). The combined use of composite leaching solvent and electrochemical leaching method can effectively improve the removal rate of uranium in contaminated soil, in which the average removal rate of uranium in contaminated soil is 59.75%, which is 13.37 percentage points higher than that of single chemical leaching under the optimal parameters of voltage of 30 V, composite concentration of citric acid + ferric chloride of 0.1 mol/L+7.5 g/L, liquid-solid ratio of 5 mL/g and temperature of 25 ℃.