STUDY ON THE EXTRACTION OF ACTINIDES FROM SIMULATED HIGH-LEVEL LIQUID WASTE BY DHDECMP-TBP/OK

The distribution ratios of U(Ⅵ),Np(Ⅴ),Pu(Ⅳ) and Am(Ⅲ) are determined with 22%DHDECMPTBP/OK from simulated highlevel liquid waste (HLLW).The extraction behavior of U(Ⅵ),Np(Ⅴ),Pu(Ⅳ) and Am(Ⅲ) in simulated highlevel liquid waste is investigated on miniature countercurrent centrifugal contactor cascade (6 stages for extraction, 2 stages for scrubbing, 6 stages for stripping,AF∶AX∶AS=1∶1.5∶0.5;BF∶BX=1∶1).The experimental results show that removal efficiencies of U(Ⅵ),Np(Ⅴ),Pu(Ⅳ) and Am(Ⅲ) from simulated HLLW are equal or more than 99.9%;the stripping efficeincies of U(Ⅵ),Np(Ⅴ),Pu(Ⅳ) and Am(Ⅲ) are 2%,39%,2%and 99.9%, respectively.