ISSN print edition: 0366-6352 ISSN electronic edition: 1336-9075 Registr. No.: MK SR 9/7 Published monthly

Extraction of Rare Earth Metals by Bis(2-Ethylhexyl)phosphoric Acid

E. Sminčáková, Ľ. Komorová, and M. Gálová

Department of Chemistry, Faculty of Metallurgy, Technical University, SK-042 00 Košice

Abstract: The extraction of lanthanum, samarium, and hydrogen ions from aqueous HNO₃ solutions by bis(2-etylhexyl)phosphoric acid solution in benzene has been studied. The distribution ratio dependence on the pH of the aqueous phase and concentration of extractant in the organic phase was investigated. The stoichiometric coefficients of the overall extraction reaction were determined as slopes of the logarithmic dependence of the distribution coefficients on the pH and the extractant concentration. The separation factors α_Sm/La ranging around the value of 10 decrease with addition of α-hydroxyisobutyric acid.

Full paper in Portable Document Format: 484a242.pdf

Chemical Papers 48 (4) 242–245 (1994)