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Separation of Ytterbium and Lutetium with Solutions of (2-Ethylhexyl)phosphonic Acid Mono-2-ethylhexyl Ester in Hydrocarbons from Nitric Acid Solutions and Its Simulation

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Abstract

Recovery of lutetium and ytterbium with solutions of 2-ethylhexylphosphonic acid mono-2-ethylhexyl ester in isopar-M and m-nitrobenzotrifluoride (F3), as well as with solutions of bis(2,4,4-trimethylpentyl)phosphinic acid in isopar M was investigated. Using the equilibrium shift method, it was shown that ytterbium and lutetium are recovered by the cation exchange mechanism in the form of the Ln[HA2]3 adduct up to 3 M HNO3, and with a further increase in the concentration of nitric acid in an aqueous solution, the separation mechanism changes to a solvate one. The separation factors β(Lu/Yb) in the studied separation systems are 1.4–1.6. The obtained data can be used for subsequent calculations of the extraction cascade for the separation of lutetium and ytterbium. Mathematical processing of experimental data was carried out to derive separation constants.

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Authors and Affiliations

  1. Khlopin Radium Institute, 194021, St. Petersburg, Russia

    E. V. Ambul, N. D. Goletskii, A. I. Medvedeva, A. A. Naumov, E. A. Puzikov & D. N. Shishkin

  2. St. Petersburg State Technological Institute (Technical University), 190013, St. Petersburg, Russia

    E. V. Ambul & M. A. Afonin

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  1. E. V. Ambul
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  2. N. D. Goletskii
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  3. A. I. Medvedeva
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  4. A. A. Naumov
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  5. E. A. Puzikov
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  6. M. A. Afonin
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  7. D. N. Shishkin
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Correspondence to N. D. Goletskii.

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Translated from Radiokhimiya, No. 3, pp. 233–240, July, 2022 https://doi.org/10.31857/S0033831122030054

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Ambul, E.V., Goletskii, N.D., Medvedeva, A.I. et al. Separation of Ytterbium and Lutetium with Solutions of (2-Ethylhexyl)phosphonic Acid Mono-2-ethylhexyl Ester in Hydrocarbons from Nitric Acid Solutions and Its Simulation. Radiochemistry 64, 300–307 (2022). https://doi.org/10.1134/S1066362222030067

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