DHDECMP-TBP/OK萃取模拟高放废液中锕系元素的工艺研究

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

摘要: 测定了22%DHDECMP 42%TBP/OK从模拟高放废液中萃取锕系元素的分配比;在微型离心萃取器(转鼓=10mm)串联台架上,进行了从模拟高放废液中萃取锕系元素的工艺条件研究。结果表明,经6级萃取、2级洗涤、6级反萃,流比AF∶AX∶AS=1∶1 5∶0 5,BF∶BX=1∶1时,在萃取器A中,U,Np,Pu,Am的回收率均大于99 9%;在反萃器B中,Am的反萃率>99 9%,U,Np和Pu的反萃率分别为2%,39%,2%。

Abstract: 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.