Abstract
The extraction of lanthanum, neodymium, and thorium from 73LiF-27BeF2, 78LiF-22ThF4, 75LiF-5BeF2-20ThF4, 15LiF-58NaF-27BeF2, and 60LiF-40NaF (mol %) fluoride salt melts into liquid bismuth with admixtures of lithium as a reducing agent was studied at 580–750°C. Equilibrium values of their distribution coefficients were measured. Beryllium as distinct from neodymium and lanthanum almost was not extracted into bismuth from salt beryllium-containing compositions. A decrease in the mole fraction of LiF in LiF-BeF2 melts substantially increased the effectiveness of its purification from lanthanides. The LiF-ThF4 and LiF-BeF2-ThF4 salt mixtures with comparatively high thorium concentrations (≥20–22 mol %) could not be used for effective separation of lanthanides and thorium in a system for extraction processing of fuel salts.
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