CARBAMIDES FOR THE SEPARATION OF URANIUM (VI) AND PLUTONIUM (IV) WITHOUT REDUCTION OF PLUTONIUM (IV)

摘要

The invention relates to the use of carbamides as extractants for totally or partially separating uranium (VI) from plutonium (IV) from an aqueous solution resulting from the dissolution of spent nuclear fuel in nitric acid, by liquid-liquid extraction, without any reduction of the plutonium (IV) in plutonium (III). It also relates to new carbamides. Applications: treatment of spent nuclear fuel based on uranium (in particular uranium oxide - UOX) or uranium and plutonium (in particular mixed oxides of uranium and plutonium - MOX).