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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${it t}$=${it k}$[NNDMH][Pu(IV)] where ${it k}$=8.3$$times$$10$$^{-5}$$ M$$^{-1}$$s$$^{-1}$$ at room temperature (298$$pm$$1 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.

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