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Sur la séparation des terres rares à l'aide de l'acide éthylènediamine-tétraacétique. III. Séparation par cristallisation des sels complexes NH4[RY]

✍ Scribed by G. Brunisholz


Publisher
John Wiley and Sons
Year
1955
Tongue
German
Weight
286 KB
Volume
38
Category
Article
ISSN
0018-019X

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✦ Synopsis


Abstract

Seven hydrates of the ammonium lanthanon ethylenediamine‐tetraacetate complexes have been identified. The well crystallized octahydrates are isomorphous with the previously described sodium salts. Most of the other compounds form very thin needles and have a marked tendency to give supersaturated solutions. Owing to their different structure, the various species form only partly miscible mixed crystals. This fact greatly improves the separation of some of the lanthanons. A cyclic process is outlined by which a mixture of the cerit earths can be separated into two fractions, one containing more than 80% and the other only 25% La~2~O~3~.


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