Influence of nitric acid and nitrous acid on oxidation and extraction of neptunium with double scrub flow sheet in simplified solvent extraction process

Nakahara, Masaumi; Koma, Yoshikazu

The influence of the HNO $_{3}$ concentration in the feed and scrubbing solutions on the behavior of Np was evaluated experimentally and found to be co-extracted into the tri--butylphosphate with U and Pu. Almost all the Np in a 4.9 mol/dm $^{3}$ HNO $_{3}$ feed solution was recovered with U and Pu, based on the experimental flow sheet with double scrubbing solutions of 9 and 1 mol/dm $^{3}$ HNO $_{3}$ . The experimental results showed a large contribution from the HNO $_{3}$ concentration in the feed solution and at the extraction section to Np(V) oxidation. On the other hand, calculation results showed that high HNO $_{2}$ concentrations in the feed solution tended to leak Np into the raffinate.

Language	:	English
Journal	:	Journal of Chemical Engineering of Japan
Volume	:	44
Number	:	5
Pages	:	p.313 - 320
Publication Year/Month	:	2011/05
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Paper URL	:	https://doi.org/10.1252/jcej.11we047
DOI for research data	:
Keywords	:	no keyword
Research Facility	:	CPF(高レベル放射性物質研究施設)
Press Release	:
Article of JAEA R&D Review	:	Separation and Recovery of Long-Lived Nuclides for Reduction of Radioactive Waste; Behavior of Oxidation and Extraction of Neptunium in Simplified Solvent Extraction Process[/]
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Registration No. : AA20110038
JAEA Abstracts No. : 39000984
Paper Submission No. : 9236

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