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Bench-Scale Test for Separation of Sr2+ and Nd3+ from HLLW Using TiBOGA

A bench-scale test for the separation of strontium and trivalent lanthanides/actinides, using Nd3+ as a surrogate, from a simulated acidic high level liquid waste (HLLW) has been performed with a set of 10-mm centrifugal contactors using N,N,N′N′-tetra-iso-butyl-3-oxa-glutaramide (TiBOGA) as extractant. The test shows that Sr2+ and Nd3+ can be co-extracted from the HLLW and then separated from each other by step stripping. The results indicate that 99.99% of Sr2+ and Nd3+ can be removed from the HLLW, and less than 0.01% of Nd3+ remains in Sr2+ product stream and 0.1% of Sr2+ in Nd3+ stream. In HNO3 solutions −0.2 M TiBOGA in 40% octanol/kerosene system the mass transfer stage efficiencies of HNO3 and Sr2+ have also been studied on a single-stage 10-mm centrifugal contactor.