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Abstract
Separation of rare earth elements has been studied by high– speed countercurrent chromatography (CCC) employing 2-ethylhexylphosphonic acid mono-2-ethylhexyl ester in toluene as a stationary phase. The CCC method was applied to purification of rare earth elements in a wide range of concentrations. High-purity yttrium was chromatographically isolated by removing micro amounts of similar lanthanoid elements such as holmium and erbium.
ACKNOWLEDGMENTS
The authors sincerely thank Shimadzu Corporation and Mr. Y Saito for providing the CCC apparatus, and Mr. H. Oizumi for his technical assistance in repairing the CCC apparatus.