RECIPROCAL INFLUENCE OF RARE-EARTH ELEMENTS WHEN EXTRACTED BY TRIBUTYLPHOSPHATE (in Russian)
The reciprocal influence of rare elements in tributyl phosphate extraction was investigated using neodymium, samarium, and ytterbium in nitric acid media. Direct acidity after introducing rare earth salts was approximately 12 N. The tabulated results show that instead of salting out, a reverse reaction takes place (the self-salting effect). The self-salting is the result of limited rare earth solubility in the organic phase. With yttrium, the stronger the extraction the earlier the seif-salting process appears. However, with Nd and Sm the recovery remains constant until the indicator concentration is about 5%. Two series of experiments were undertaken in order to clarify the reciprocal effect. The first series determined the effects of concentrations of cerium earths on the TBP solvent extraction of neodymium, samarium, yttrium. holmium. and ytterbium in nitric acid, with the aqueous to organic ratio 3 : 1. The composition of the didymium according to spectral lines was 55% Nd, 17% Pr, 3.7% Sm, 7.0% La, 0.72% Eu, 0.7% Gd, < 0.4% Dy, < 0.1% Er, 0.04% Yb, 0.04% Lu, and < 0.1% V. In some cases the didymium concentration of 2 to 5% does not show any effects, and while 20% reduces the extraction of all rare earth elements except ytterbium. The absence cf didymium effects on yttrium and its weak effects on Y and Ho suggested that the yttrium earth reciprocal effects would be stronger, especially in cerium earths. Hence, a second series of experiments was made with yttrium concentrates of 2.5% Nd, 0.7% Pr, 2.4% Sm, 4.3% La, < 0.1% Eu, 4.0% Gd, 1.4% Tb, 52% Dy, 4.3% Er, 0.9% Tm, 6.5% Lu, 1.45% V. It was observed that even 2% concentration of the admixture affects the reaction for all rare earths. (R.V.J.)
- Research Organization:
- Inst. of Inorganic Chemistry, Siberian Branch of the Academy of Sciences, USSR
- NSA Number:
- NSA-14-006344
- OSTI ID:
- 4204251
- Journal Information:
- Doklady Akad. Nauk S.S.S.R., Vol. Vol: 129; Other Information: Orig. Receipt Date: 31-DEC-60
- Country of Publication:
- Country unknown/Code not available
- Language:
- Russian
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