On the Study of Co-separation of Thorium and Rare Earths with Calcium Sulphate on a Tracer Scale
| Main Authors: | B. C. Purkayastha, S. N. Bhattacharyya |
|---|---|
| Format: | Article Journal |
| Bahasa: | eng |
| Terbitan: |
, 1963
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| Subjects: | |
| Online Access: |
https://zenodo.org/record/6520211 |
Daftar Isi:
- Co-precipitation of thorium (UX1) and rare earths (Ce144, Pm147, Eu152, Eu154, and Y91) with calcium sulphate has been investigated. Thorium and rare-earth tracers are taken up through mixed crystal formation by en unstable form of calcium sulphate which subsquently turns out to stable monoclinic gypsum. The range of mixed crystal formation in all these ones is, however, very narrow. When the concentration of the tracer ion exceeds that range, the uptake obeys an adsorption isotherm. It has been found that the presence of one rare earth, the concentration of which is just beyond the range of mixed crystal formation, causes the uptake of another rare earth (in tracer concentration ) to obey the Freundlich adsorption isotherm. Uptake of yttriuni and thorium, however, differs in this respect from that of rare earths. These two in finite quantity do not exert any influence on the uptake of tracer rare senile and vice versa. A comparative study of the A values for different rare earths indicates that mixed crystal formation in these ranee is through double-salt formation.