Sur la séparation des terres rares à l'aide de l'acide éthylènediamine‐tétraacétique. IX. Procédé en cycle pour le fractionnement des terres yttriques

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Abstract
A cyclic process for the fractionation of the yttrium earths is described. The existence of a miscibility gap between the salts NH4[R'‐EDTA], 8 H2O and NH4 [R″‐EDTA]−, 6 H2O (R′ = elements of the cerium group plus Gd and Tb; R″ = elements Dy to Lu, including Y; EDT.4 = ethylendiamine‐tetraacetate) provides an excellent separation. The method is suitable for collecting in a small fraction and with a high yield the traces of the heavy lanthanides present in a mixture containing about 80% (Sin + Gd).