New method for removing rare earth element in spent fuel
A spent fuel and organic phase technology, applied in solid separation, flotation, etc., can solve the problems of acid leaching high-level waste liquid, reducing the thermal conductivity of uranium dioxide, etc., and achieve high economic benefits, reduced risks, and low costs Effect
Active Publication Date: 2015-12-30
INST OF MODERN PHYSICS CHINESE ACADEMY OF SCI +1
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The invention provides an ionic-liquid-containing dual-organic-phase flotation separation system and a method for removing rare earth elements in spent fuel. The system comprises a first organic phase (also called as an upper layer phase or phase 1) which comprises a basic solvent phase consisting of one or a plurality of the following substances: multi-chain organic alkane solvent, organic ester solvent, oleic acid fatty acid solvent and naphthenic acid solvent; a second organic phase (also called as a lower layer phase or phase 2) which is a composite phase of first type ionic liquid and second type ionic liquid, wherein the first type ionic liquid is imidazole ionic liquid and the second type ionic liquid is selected from pyridine, pyrrole, tertiary ammonium or other functionalized ionic liquid. Through a multistage tandem differential flotation process, the direct all-solid separation of rare earth elements from spent fuel can be effectively realized.
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