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Solvent extraction of tin in nitric acids; Evaluation of multiple extractants

Ito, Kengo*; Takahashi, Shin*; Kato, Chizu*; Fukutani, Satoshi*; Matsumura, Tatsuro  ; Fujii, Toshiyuki*

In this study, the solvent extraction behavior of tin (Sn), specifically $$^{126}$$Sn, from high-level radioactive waste was evaluated using six different extractants in a HNO$$_{3}$$ 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 HNO$$_{3}$$, both tributyl phosphate (TBP) and N,N,N,N'-tetra-2-ethylhexyl diglycolamide (TEHDGA) achieved D$$_{Sn}$$ values greater than 1 at $$>$$ 1 M HCl. However, due to practical challenges in industrial applications, HAA extraction in HNO$$_{3}$$ systems, particularly at low Sn concentrations (0.0008 M), may provide a more effective solution for Sn recovery.

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Category:Chemistry, Analytical

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