Method of extracting uranium (VI) and/or plutonium (IV) present in an aqueous acid solution by means of a mixture of N,N-dialkyl amides, for use in the reprocessing of irradiated nuclear fuels

摘要

An aqueous solution containing U(VI) and Pu(IV) is brought into contact with an organic solvent containing:… - a first N,N-dialkylamide of formula: …IMAGE… in which R1 is a linear alkyl radical containing 1 to 12 carbon atoms or an H radical, R2 and R4, which are identical or different, are linear or branched alkyl radicals containing from 2 to 4 carbon atoms, R3 and R5, which are identical or different, are linear or branched alkyl radicals containing form 1 to 6 carbon atoms, and a and b, which are identical or different, are integers ranging from 1 to 6, and… - a second N,N-dialkylamide of formula: …IMAGE… in which R2, R3, R4, R5, a and b have the meaning given above and R6 is a branched alkyl radical containing from 3 to 12 carbon atoms.