Recovery of highly-purified rare earth elements using newly-synthesized chelating resins.

概要

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The chromatographic separation of rare earth elements was studied using newly-synthesized chelating resins which have EDTA (ethylenediaminetetraacetic acid) and DTTA (diethylenetriaminetetraacetic acid) pendant groups. The chromatography using EDTA- and DTTA-chelating resins gave excellent separation results, while the IDA-chelating resin was not satisfactory. The DTTA-type resin was especially effective, allowing highly purified rare earth elements to be recovered. The separation efficiency of each resin was attributed mainly to the difference in its complexing capability among rare earth ions. Prior to experimentation, the chromatographic conditions were assessed and optimized by computer simulation based on newly introduced equations. The simulation results were effective in the case of Pr<SUP>3+</SUP>/Nd<SUP>3+</SUP> for determining the experimental conditions. An analysis of the experimental results helped to elucidate the mechanism of the chromatographic separation while using the simulation results.
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