Process for separation of neptunium from an organic phase in the

Details Process for separation of neptunium from an organic phase in the Process for separation of neptunium from an organic phase in the

1984-09-10

1987-04-21

Miller, Edward A.

Chemistry of inorganic compounds

Treating mixture to obtain metal containing compound

Radioactive metal

423 8, 423250, C01G 5600

Patent

active

046595511

ABSTRACT:
A process for the separation of neptunium from an organic phase, which is developed in the recovery of irradiated nuclear fuel and/or fertile material. The organic phase contains uranium-, plutonium- and neptunium ions, tritium in the form of tritiated water and fission products in ionic form, as well as an organic extraction agent dissolved in diluent. After a first wash step, and before the organic phase is further fed to a uranium-plutonium separation or to a uranium-plutonium coreextraction, the organic phase is brought into contact with an aqueous solution containing diluted HNO.sub.3, butyraldehyde and a low concentration of sulfamic acid in countercurrent flow as a second wash step for the selective reduction of Np (VI) to Np (V) and for selective stripping of Np (V), with respect to U and Pu, from the organic into an aqueous phase. The resulting aqueous phase charged with Np (V) and with portions of tritium and fission products is brought into contact with a solution of fresh extraction agent solution having a flow which corresponds to from 1/13.3 to 1/3.3 of the flow of the organic phase coming from the first wash step and to be decontaminated, to assure the selectivity of the stripping of Np (V) in reference to U and Pu. The aqueous phase resulting from this step and containing Np (V), T and fission products is then separated from the solution of fresh extraction agent.

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KFK 2558, "Experience with the Reprocessing of LWR, Pu Recycle, and FBR Fuel in the MILLI Facility", W. Oschsenfeld et al., Sep. 1977.
"NP.sup.237 and PU.sup.238 Separation at the Savannah River Plant", W. L. Poe et al., I&EC Process Design and Development, vol. 3, No. 4, pp. 314 to 322.

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