Abstract: Tests were made on static and dynamic adsorption of uranium from the pregnant solution in bioleaching of Xiangshan uranium ore by 717# alkali anion-exchange ions. Ascorbic acid was used in the dynamic rinsing test on Fe³⁺ impurity coexisting with uranium in the resin after the adsorption. The static adsorption test results indicate that, to improve the resin's adsorption capacity for uranium, the uranium concentration in the bioleached solution should be as high as possible, the solution pH should be adjusted to about 1.4 and the time of the contact between the resin and the solution should be as long as permissible. The dynamic test results show that 717# alkali anion-exchange ion has a rather strong adsorption ability for uranium. When the ratio of the volume of the uranium solution passing through the exchange column to that of the column is 206, the uranium adsorption amount in the resin can reach 93.54 mg/mL. The dynamic rinsing test results indicate that ascorbic acid has strong de-oxidation ability for Fe³⁺ and good iron-uranium effect can be achieved if ascorbic acid is used to strip Fe³⁺ from the loaded resin.

Key words: Bioleaching solution of uranium ore, 717# alkali anion-exchange ion, Ascorbic acid, Adsorption, Uranium-iron separation