Extraction of ytterbium from nitric acid with hexane solutions of 2-ethylhexylphosphonic acid mono-2-ethylhexyl ester

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Abstract

The extraction of ytterbium with solutions of mono(2-ethylhexyl) ether of 2-ethylhexylphosphonic acid (HEH[EHP]) in hexane from nitric acid solutions at an HEH[EHP] concentration of 0.5–2.0 mol/L, acidity of 0.1–2.0 mol/L, and lanthanide concentration from 0.1 to 5 g/L was studied. It is shown that the dependences of the ytterbium distribution coefficients on the acidity of the solution are described by expressions such as logD = alog[H+] + b, with the value of the coefficient a depending on the extractant and lanthanide concentrations and varying in the range from –1.26 to –3.0. The probable cause is extraction by both cation-exchange and solvation mechanisms. A model describing the dependence of the ytterbium distribution coefficient on its concentration in the aqueous phase at various extractant concentrations and acidities is proposed. The model reasonably agrees with the experimental data.

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About the authors

K. S. Bobrovskaya

Kapitsa Research Institute of Technology, Ulyanovsk State University

Author for correspondence.
Email: rostislavkuznetsov@yandex.ru
Russian Federation, Ulyanovsk

R. A. Kuznetsov

Kapitsa Research Institute of Technology, Ulyanovsk State University

Email: rostislavkuznetsov@yandex.ru
Russian Federation, Ulyanovsk

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Supplementary files

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2. Fig. 1. Dependence of the ytterbium distribution coefficients on the concentration of the HNO3 solution at different concentrations of HEH[EHP] (mol/l: ♦ – 0.5, ■ – 1, ▲ – 1.5, ● – 2) and metal (g/l: a – 0.1 g/l, b – 1, c – 5).

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3. Fig. 2. Change in raffinate acidity as a function of ytterbium concentration in the organic phase during extraction with a 1.5 mol/L HEH[EHP] solution from a 0.1 mol/L nitric acid solution.

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4. Fig. 3. IR Fourier spectra of the extractant HEH[EHP] before (1) and after (2) saturation with ytterbium and the resulting precipitate of the extractant salt with Yb (3).

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5. Fig. 4. Dependence of the ytterbium distribution coefficients on the concentration of the HEH[EHP] solution in hexane at different concentrations of nitric acid (mol/l: ♦ – 0.5, ■ – 1, ▲ – 1.5, ● – 2) and metal (g/l: a – 0.1, b – 1, c – 5).

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6. Fig. 5. Dependence of the ytterbium extraction constant on the metal concentration.

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7. Fig. 6. Dependence of ytterbium distribution coefficients on its concentration in the aqueous phase during extraction with HEH[EHP] solutions of different concentrations in hexane (mol/l: a – 0.5, b – 1, c – 1.5, d – 2) at different concentrations of nitric acid (mol/l: ♦ – 0.5, ■ – 1, ▲ – 1.5, ● – 2). Points – experiment, lines – calculation.

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