Reduction kinetics of Pu(IV) and Np(VI) by N,N-dimethylhydrazine, and its potential application in nuclear fuel reprocessing

Ban, Yasutoshi ; Asakura, Toshihide; Morita, Yasuji

Reduction kinetics of Pu(IV) by N,N-dimethylhydrazine (NNDMH) were studied by spectrophotometry, and the reduction rate equation in 3 M (mol/dm $^{3}$ ) nitric acid was obtained as follows: -d[Pu(IV)] $_{{it t}}$ /d=[NNDMH][Pu(IV)] where =8.310 $^{-5}$ M $^{-1}$ s $^{-1}$ at room temperature (2981 K). Reduction properties of NNDMH for U(VI), Np(VI), and Pu(IV) was studied in the mixture solution of tri-n-butylphosphate diluted to 30 vol.% by n-dodecane (30% TBP) and 3 M nitric acid. It was confirmed that NNDMH selectively reduce Np(VI) to Np(V) without affecting the valences of U(VI) and Pu(IV) in a few minutes. Simple numerical simulation indicated that 99.9% of Np was separated from U and Pu applying NNDMH for a mixer-settler.

Language	:	English
Journal	:	Journal of Radioanalytical and Nuclear Chemistry
Volume	:	279
Number	:	2
Pages	:	p.423 - 429
Publication Year/Month	:	2009/02
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Paper URL	:	https://doi.org/10.1007/s10967-007-7262-4
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Research Facility	:	BECKY(バックエンド研究施設)
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Registration No. : AA20070750
JAEA Abstracts No. :
Paper Submission No. : 7336

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