METHOD FOR COPRECIPITATION OF ACTINIDES WITH DIFFERENT OXIDATION STATES AND METHOD OF OBTAINING MIXED ACTINIDE COMPOUNDS Russian patent published in 2011 - IPC C01G43/00 C01G56/00 G21C3/02 

FIELD: chemistry.

SUBSTANCE: invention can be used to produce heat resistant compounds based on mixed oxides, nitrides or carbides of actinides. A stabilising monovalent cation consisting of oxygen, carbon, nitrogen and hydrogen atoms only or a compound such as a salt which forms the said cation, is added to one or more solutions of actinide(s) containing at least one actinide An¹ and at least one actinide An'¹. A solution or mixture consisting of at least an actinide An¹ with oxidation state (IV), at least one actinide An'¹ with oxidation state (III) and the said stabilising monovalent cation is obtained. A solution of oxalic acid or one of its salts or derivative of that salt is added to the obtained mixture, resulting in simultaneous precipitation of said actinides An¹ (IV) and An'¹ (III), as well as a portion of the stabilising monovalent cation from the said mixture. The obtained precipitate is calcined.

EFFECT: invention enables to obtain homogeneous mixed compounds with controlled composition, whose homogeneity is similar or close to homogeneity of solid solutions of actinides.

29 cl, 6 ex