Solvent extraction of irradiated neptunium targets. I. Valence stabilization
Solvent extraction of /sup 237/Np and /sup 238/Pu from irradiated neptunium is being investigated as a possible replacement for the currently used anion exchange process at the Savannah River Plant. Solvent extraction would reduce separations costs and waste volume and increase the production rate. The major difficulty in solvent extraction processing is maintaining neptunium and plutonium in the extractable IV or VI valence states during initial extraction. This study investigated the stability of these states. Results show that: The extractable M(IV) valence states of neptunium and plutonium are mutually unstable in plant dissolver solution (2 g/l /sup 237/Np, 0.4 g/l /sup 238/Pu, 1.2M Al/sup 3 +/, 4.6M NO/sub 3//sup -/, and 1M H/sup +/). The reaction rates producing inextractable species from extractable M(IV) or M(VI) are fast enough that greater than or equal to 99.9 percent extractable species in /sup 237/Np--/sup 238/Pu mixtures cannot be maintained for a practicable processing period (24 hours).
- Research Organization:
- Du Pont de Nemours (E.I.) and Co., Aiken, SC (USA). Savannah River Lab.
- DOE Contract Number:
- E(07-2)-1
- OSTI ID:
- 7228324
- Report Number(s):
- DP-1452
- Country of Publication:
- United States
- Language:
- English
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