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Studies on the synergistic extraction of rare earths with a combination of 2-ethylhexylphosphonic acid mono-2-ethylhexyl ester and trialkylphosphine oxide

✍ Scribed by Xiaobo Sun; Shulan Meng; Deqian Li

Publisher
Wiley (John Wiley & Sons)
Year
2006
Tongue
English
Weight
140 KB
Volume
81
Category
Article
ISSN
0268-2575

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✦ Synopsis

Abstract

The synergistic extraction of rare earths (La, Nd, Gd, Y and Yb) with a mixture of 2‐ethylhexyl 2‐ethylhexylphosphonate (EHEHPA) (HA) and trialkylphosphine oxide (Cyanex 923) (B) from a hydrochloride medium was investigated. The mixed system significantly enhances the extraction efficiency for lighter lanthanides and the synergistic enhancement coefficients for La (4.52), Nd (3.35), Gd (2.08), Y (1.31) and Yb (1.08) decrease with decreasing ionic radius of the rare earths. The extraction equilibrium of La, Nd and Gd indicate that La and Nd were extracted as MA~3~·B, whereas Gd was extracted as Gd(OH)A~2~(HA)~2~·B. The equilibrium constants, thermodynamic functions such as Δ__G__, Δ__H__ and Δ__S__ and formation constants of the extracted species were determined. The stripping properties were also studied. Copyright © 2006 Society of Chemical Industry

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