Method of desorbing absorbed uranium

Purpose: To determine the necessary and sufficient amount of desorbent for effectively desorbing uranium from titanate type absorbent which carries absorbed uranium from seawater. Method: An aqueous alkali carbonate solution is used as the desorbent having a carbonic radical concentration above 0.4 mol/l and M1/(W2/222) value between 1 - 30 (M1 represents the mol number of carbonic radical and W2 represents the dry weight of titanate). The titanate type absorbent is prepared, for example, by adding urea, aqueous ammonia or the like to an aqueous solution of titanium sulfate or titanium tetrachloride and hydrolyzing them under heating above 1000C. The alkali carbonate such as sodium carbonate and potassium carbonate is used. Desorption is conducted by the use of the above desorbent and the desorption solution thus obtained is again adjusted for reuse to 0.4 mol/l of carbonic radical concentration and M1/(W2/222) greater than 1. (Ikeda, J.)