Solvent extraction of uranium with ,-di(2-ethylhexyl)octanamide from nitric acid medium

Tsutsui, Nao ; Ban, Yasutoshi ; Sagawa, Hiroshi; Ishii, Sho; Matsumura, Tatsuro

Solvent extraction of uranium from a nitric acid medium was performed with ,-di(2-ethylhexyl)octanamide (DEHOA) by a single-stage batch method, and the distribution ratio equation of U(VI) was derived as ${it D}_{rm U}$ = 1.1 $[rm NO^{-}_{3}]^{1.6}_{rm aq}[{rm DEHOA}]^{2}_{rm org}$ . Furthermore, the nitric acid distribution was also evaluated, and the distribution ratio equation ${it D}_{rm H}$ = 0.12 $[rm H^{+}]^{0.76}_{rm aq}[{rm DEHOA_{rm Free}}]_{rm H}$ was obtained. Batch experiments to evaluate the time dependence of U(VI) extraction and the U(VI) loading capacity of DEHOA were also performed. It was revealed that U(VI) extraction by DEHOA reached an equilibrium state within a few minutes, and the loading capacity was 0.71 mol/dm $^{3}$ (M) when the concentrations of DEHOA and nitric acid were 1.5 and 3.0 M, respectively.

Language	:	English
Journal	:	Solvent Extraction and Ion Exchange
Volume	:	35
Number	:	6
Pages	:	p.439 - 449
Publication Year/Month	:	2017/08
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Paper URL	:	https://doi.org/10.1080/07366299.2017.1362842
DOI for research data	:	Link to research data related to this paper/report.
Keywords	:	N,N-ジアルキルアミド; モノアミド; ウラン; 溶媒抽出; 再処理
Research Facility	:	BECKY(バックエンド研究施設)
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Registration No. : AA20160398
JAEA Abstracts No. : 45001235
Paper Submission No. : 19466

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