Reduction kinetics of Pu(IV) and Np(VI) by N,N-dimethylhydrazine,and its potential application in nuclear fuel reprocessing |
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| Authors: | Y Ban T Asakura Y Morita |
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| Institution: | (1) Research Group for Aqueous Separation Process Chemistry, Nuclear Science and Engineering Directorate, Japan Atomic Energy Agency, Shirane 2-4, Tokai, Ibaraki 319-1195, Japan |
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| Abstract: | Reduction kinetics of Pu(IV) by N,N-dimethylhydrazine (NNDMH) were studied by spectrophotometry, and the reduction rate equation
in 3M (mol/dm3) nitric acid was obtained. The reduction properties of NNDMH for U(VI), Np(VI), and Pu(IV) was studied in the mixture solution
of trin-butylphosphate diluted to 30 vol.% by n-dodecane (30% TBP) and 3M 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. Numerical simulation indicated
that 99.9% of Np was separated from U and Pu applying NNDMH for a mixer-settler. |
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