Extraction of antimony and niobium with tributyl phosphate from fluoride-ammonium solutions

The purification of niobium from antimony impurity via extraction with tributyl phosphate from solutions of the HF + NH 4 F mixture has been studied. It has been established that at an HF + NH 4 F content equal to 7–16 mol/L and an NH 4 F concentration of 30% in the mixture, Sb extraction hardly cha...

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Veröffentlicht in:	Theoretical foundations of chemical engineering 2016-09, Vol.50 (5), p.781-784
Hauptverfasser:	Maiorov, V. G., Mudruk, N. V., Nikolaev, A. I., Elizarova, I. R., Safonova, L. A.
Format:	Artikel
Sprache:	eng
Schlagworte:	Antimony Chemistry Chemistry and Materials Science Extraction Industrial Chemistry/Chemical Engineering Niobium Technology of Inorganic Substances and Materials
Online-Zugang:	Volltext
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Zusammenfassung:	The purification of niobium from antimony impurity via extraction with tributyl phosphate from solutions of the HF + NH 4 F mixture has been studied. It has been established that at an HF + NH 4 F content equal to 7–16 mol/L and an NH 4 F concentration of 30% in the mixture, Sb extraction hardly changes (70–80% for one stage), and Nb coextraction abruptly decreases to values of less than 0.5%.
ISSN:	0040-5795 1608-3431
DOI:	10.1134/S0040579516050158