STUDY ON BACK-EXTRACTION OF Pu(Ⅳ) FROM TRPO/KEROSENE AND TRPO TBP/KEROSENE CONTAINING UO_2~2+ AND TcO_4~-

The back extraction of Pu(Ⅳ) and the influences on UO 2 2+ and TcO 4 - with oxalic acid nitric acid solution, formic acid, glycolic acid, tartaric acid and citric acid respectively from 30 %TRPO(mixed trialkyl phosphine oxide)/kerosene and 20 %TRPO 20 %TBP(tributyl phosphate)/kerosene systems are studied. Based on the experimental results, the possible back extractants of Pu(Ⅳ) in the present of high concentration of UO 2 2+ from the above two organic phases are proposed.