Process for dissolving plutonium dioxide by means of OH.sub.- r

Details Process for dissolving plutonium dioxide by means of OH.sub.- r Process for dissolving plutonium dioxide by means of OH.sub.- r

1993-03-05

1995-06-06

Mai, Ngoclan T.

Chemistry of inorganic compounds

Treating mixture to obtain metal containing compound

Radioactive metal

423 8, 423251, 976DIG278, B01F 100

Patent

active

054220840

ABSTRACT:
The invention relates to a process for dissolving plutonium dioxide by means of OH.sup.- radicals produced by radiolysis of water and usable for the treatment of dissolving fines and plutoniferous waste.
To this end, contacting takes place in a reactor (1) of solid products containing PuO.sub.2 coming from the hopper (5) with an aqueous nitric solution (3) irradiated by radiation or charged particles for producing OH.sup.- radicals by radiolysis of said solution, in the presence of a reagent such as N.sub.2 O, able to trap the solvated electrons and the H.sup.- radicals produced in simultaneous manner and optionally a redox mediator such as silver.
Irradiation can take place by an alpha or beta emitter present in the solution or by an external source such as an irradiator or an electron accelerator.

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Chemical Abstracts, vol. 114, Columbus, Ohio, US; Abstract No. 132888c, Andreichuk et al., "Plutonium (III) Oxidation Under Alpha-Irradiation in Nitric Acid Solutions", p. 704, col. 2 & J. Radioanal. Nucl. Chem. vol. 142, Eng. pp. 427-432.
Cleveland, J. M., "The Chemistry of Plutonium", Gordon and Breach Science Publisher, 1973, pp. 35-44.

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