Abtrennung von Ceriterden aus Gemischen mit Yttererden durch fraktionierte Kristallisation der Magnesiumdoppelnitrate in großem Maßstab

Summary

The fractional crystallisation of magnesium double nitrates was used to separate cerium earths from 112 kg yttrium earth mixtures; they were recovered in three different fractions. By using excess magnesium nitrate the crystallisation could be extended at least to gadolinium without using HNO₃ as solvent. In the resulting solutions (69 kg oxide) there remained yttrium and nearly all erbium and heavy yttrium earths.