Technology Study on the Extraction of Rare Earth Elements From Simulated High-level Liquid Waste By Mixture of DEDHCMP and TBP in Kerosene

Based on the single stage extraction experiments of rare earth elements with 22 % DHDECMP 42 % TBP/OK, the extraction behavior of the rare earth elements in simulated high level liquid waste are determined 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 distribution ratios and concentration profiles of the rare earth elements are obtained. The results show that the extraction efficiency of the rare earth elements is more 99 %, and the stripping efficiency is more 96 %.