A METHOD FOR RECOVERING URANIUM OXIDE FROM (U,GD)O2 SCRAP USING CARBONATE SOLUTION INCLUDING PEROXIDE

摘要

PURPOSE: A method for collecting uranium oxide is provided to increase environment friendliness by collecting the uranium oxide from a scrap which is polluted by metal oxide using carbonate solution. CONSTITUTION: Carbonate solution contains hydrogen peroxide in a (U, Gd)O2 scrap which is polluted by metal oxide. The carbonate solution is added and uranium and gadolinium oxides dissolve. Acid solution is added to uranium and gadolinium oxides and the uranium oxide is deposited. Carbon dioxide reacts to alkaline solution and is collected to carbonate. The uranium oxide which is deposited is refined by eliminating gadolinium oxide. The refined uranium oxide is washed. [Reference numerals] (AA) Step1; (BB) Step2; (CC) Carbonate solution collection; (DD) Metal contamination(U, Gd)O2 nuclear fuel scrap; (EE) Carbonate solution U dissolution; (FF) Acidification; (GG) UO4 precipitation; (HH) Acid, alkali electrolytic withdrawal; (II) Contamination metal oxide; (JJ) Acid dissolution; (LL) UO4 precipitation; (MM) Washing; (NN) Step4 and step5; (OO) UO4; (PP) U conversion