Process for the dissolution of actinic oxides

Details Process for the dissolution of actinic oxides Process for the dissolution of actinic oxides

2007-07-03

2007-07-03

Phasge, Arun S. (Department: 1753)

Electrolysis: processes, compositions used therein, and methods

Electrolytic process involving actinide series elements or...

Plutonium

C205S046000, C205S049000

Reexamination Certificate

active

10528905

ABSTRACT:
The invention provides a process for dissolving actinic oxides, the process comprising performing the steps of (a) introducing the actinic oxides into a solution of nitric acid; (b) treating the acidic solution in order to substantially remove palladium; and (c) treating with divalent silver. Preferably, the actinic oxides are comprised in spent nuclear fuel. Optionally, the process comprises a second treatment of the acidic solution in order to substantially remove palladium and a second treatment with divalent silver. The steps may be performed on a batchwise or continuous basis. The treatment to remove palladium is preferably carried out by solvent extraction or ion exchange, and provides greatly improved rates of dissolution of oxides of plutonium. The treatment with divalent silver preferably involves the addition of a source of monovalent silver, followed by an electrolysis treatment to generate divalent silver.

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Y.-Z. Wei, et al.; Separation of Actinides from Simulated Spent Fuel Solutions by an Advanced Ion-Exchange Process; Journal of Alloys and Comounds; vol. 271-273, pp. 693-696; Jun. 12, 1998; Elsevier Sequoia, Lausanne, CH.

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