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Abstract <p>Extraction of f-elements from model solutions of high-level waste (HLW) was studied in order to identify the possibility of group separation of lanthanides and other components of this waste in the extraction process using a series of (2-carbamoylethyl) diphenylphosphine oxides (CEPO). As a result it was shown that CEPO class compounds extract trivalent lanthanide cations in nitric acid media selectively and effectively. The separation factor in the pair sum Ln<sup>3+</sup>/sum of the salt background cations of the model solution of HLW reaches 6 × 10<sup>4</sup> for compounds III–IV, while for compounds I and V it turns out to be significantly smaller—about 200. Re-extraction of the sum Ln<sup>3+</sup> from the saturated organic phase occurs quantitatively using a sodium carbonate solution in contrast to aqueous reextraction.</p>

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On the Extraction of Trivalent f-Elements from High-Level Waste Containing Derivatives of (2-Carbamoylethyl) Diphenylphosphine Oxides

  • 期刊论文

  • 发表日期：

    2025年2月1日

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  • A. M. Safiulina,
  • A. V. Lizunov,
  • E. I. Goryunov,
  • V. K. Brel,
  • G. V. Kostikova,
  • V. I. Zhilov,
  • S. M. Aksenov,
  • I. G. Tananaev

摘要

Abstract

Extraction of f-elements from model solutions of high-level waste (HLW) was studied in order to identify the possibility of group separation of lanthanides and other components of this waste in the extraction process using a series of (2-carbamoylethyl) diphenylphosphine oxides (CEPO). As a result it was shown that CEPO class compounds extract trivalent lanthanide cations in nitric acid media selectively and effectively. The separation factor in the pair sum Ln3+/sum of the salt background cations of the model solution of HLW reaches 6 × 104 for compounds III–IV, while for compounds I and V it turns out to be significantly smaller—about 200. Re-extraction of the sum Ln3+ from the saturated organic phase occurs quantitatively using a sodium carbonate solution in contrast to aqueous reextraction.