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<p>In this study, the solvent extraction behavior of tin (Sn), specifically <sup>126</sup>Sn, from high-level radioactive waste was evaluated using six different extractants in a HNO<sub>3</sub> system. Among the tested extractants, <i>N,N</i>-Didodecyl-2-hydroxyacetoamide <b>(</b>HAA) exhibited higher efficiency, still not sufficient for industrial implementation. In systems where HCl was added to HNO<sub>3</sub>, both tributyl phosphate (TBP) and <i>N,N,N,N’</i>-tetra-2-ethylhexyl diglycolamide (TEHDGA) achieved <i>D</i><sub>Sn</sub> values greater than 1 at &gt; 1&#xa0;M HCl. However, due to practical challenges in industrial applications, HAA extraction in HNO<sub>3</sub> systems, particularly at low Sn concentrations (0.0008&#xa0;M), may provide a more effective solution for Sn recovery.</p>

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Solvent extraction of tin in nitric acids: evaluation of multiple extractants

  • 期刊论文

  • 发表日期：

    2025年2月10日

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  • K. T. M. Ito,
  • S. Takahashi,
  • C. Kato,
  • S. Fukutani,
  • T. Matsumura,
  • T. Fujii

摘要

In this study, the solvent extraction behavior of tin (Sn), specifically 126Sn, from high-level radioactive waste was evaluated using six different extractants in a HNO3 system. Among the tested extractants, N,N-Didodecyl-2-hydroxyacetoamide (HAA) exhibited higher efficiency, still not sufficient for industrial implementation. In systems where HCl was added to HNO3, both tributyl phosphate (TBP) and N,N,N,N’-tetra-2-ethylhexyl diglycolamide (TEHDGA) achieved DSn values greater than 1 at > 1 M HCl. However, due to practical challenges in industrial applications, HAA extraction in HNO3 systems, particularly at low Sn concentrations (0.0008 M), may provide a more effective solution for Sn recovery.