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Solvent extraction of lanthanides and yttrium from nitrate medium with CYANEX 925 in heptane

✍ Scribed by Wei Li; Xianglan Wang; Hui Zhang; Shulan Meng; Deqian Li

Publisher
Wiley (John Wiley & Sons)
Year
2007
Tongue
English
Weight
139 KB
Volume
82
Category
Article
ISSN
0268-2575

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✦ Synopsis

Abstract

The extraction behavior of lanthanides and yttrium usinsg CYANEX 925 (mixture of branched chain alkylated phosphine oxides) in n‐heptane from nitrate medium has been studied. The effects of aqueous phase ionic strength, CYANEX 925 concentration in the organic phase, and temperature on Sm^3+^, Nd^3+^ and Y^3+^ extraction have been investigated. The extractability of the lanthanides and yttrium increases with increasing nitrate concentration, as well as with increasing CYANEX 925 concentration. An extraction mechanism is proposed based on slope analysis. Furthermore, the infra‐red spectra of CYANEX 925 saturated with lanthanides are employed to provide evidence of the composition of the complex. The relationship between the logarithm of the distribution ratio and lanthanide atomic number is also discussed which indicates that yttrium can be separated from light lanthanides. In addition separation of the light and heavy lanthanide groups is also possible using CYANEX 925. From the temperature dependence data, the thermodynamic parameters values (Δ__H__, Δ__S__ and Δ__G__) are calculated. Copyright © 2007 Society of Chemical Industry

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