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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-${it n}$-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.

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