Patent ID: 7169370

Claim:
A process for coprecipitating actinides in oxidation state (IV) in which: adding an actinide (IV) selective organic complexing agent and composed uniquely of atoms selected from the group consisting of oxygen, carbon, nitrogen and hydrogen, to a first aqueous solution of an actinide An 1 in oxidation state (IV) in order to form a complex of the actinide An 1 in oxidation state (IV); adding said complexing agent to at least one second aqueous solution of an actinide An 2 in oxidation state (IV) in order to form a complex of the actinide An 2 in oxidation state (IV); intimately mixing said at least first and second solutions of complexes; simultaneously precipitating said at least two An 1 (IV) and An 2 (IV) actinide complexes from said mixture.