用二环己基 18 冠醚-6 从高放废液中萃取去除 ^(90)Sr 的热实验

THE HOT TEST OF REMOVAL STRONTIUM FROM HIGHLEVEL LIQUID WASTE BY DCH18C6 EXTRACTION

采用０．１ｍｏｌ／Ｌ二环己基１８冠醚－６－正辛醇作为萃取剂，在微型离心萃取器台架上进行了从真实高放废液中去除９０Ｓｒ的连续逆流萃取热实验研究。经过１０级萃取、２级洗涤和４级反萃后，９０Ｓｒ的去除率为９９．９６％。

n the thesis, the hot test is studied which removed strontium from genuine highlevel liquid waste(HLLW) by 0.1 mol/L DCH18C61octanol. The unit includes 10 extraction stages, 2 scrubbing stages and 4 stripping stages. The counter current hot test is carried out in a miniature centrifugal contractor unit. The hot test results show that 99.96 % of 90Sr in the HLLW feed solution are removed by the crown ester extraction. The actinides in the raffinate come from TRPO process are not extracted by DCH18C6 and ramained in the raffinate of DCH18C6 process. Cs is extracted partly and its distribution ratio is about 0.1 because the acidity of feed solution is higher than the cold test. But Cs extracted in the organic phase is scrubbed mostly by 2 stages scrubbing. Only 0.4 % of 137Cs in the feed solution is appeared in Sr stripping solution. The stripping rate is about 99.8 % in stripping stage.