Process to reclaim UO.sub.2 scrap powder

Details Process to reclaim UO.sub.2 scrap powder Process to reclaim UO.sub.2 scrap powder

1993-02-01

1996-05-07

Mai, Ngoclan

Plastic and nonmetallic article shaping or treating: processes

Shaping or treating radioactive material

423261, 252643, G01C 2100

Patent

active

055143067

ABSTRACT:
A process for reclaiming scrap UO.sub.2 materials yields a high-sinter-density pellet. The scrap is oxidized in a high-temperature furnace to produce U.sub.3 O.sub.8. The U.sub.3 O.sub.8 particles from the oxidation furnace are reacted with nitric acid to produce a solution of uranyl nitrate that meets the concentration and free acid requirements of the ADU precipitation process. A controlled two-stage ADU precipitation process is carried out to produce ADU particles with a size and morphology that leads to high-surface-area UO.sub.2 powder with excellent sintered pellet ceramic characteristics. After calcination and hydrogen reduction to UO.sub.2, the high-surface-area UO.sub.2 powder is passivated.

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"The Influence of Precipitation Conditions on the Properties of Ammonium Diuranate and Uranium Oxide Powders," Janov et al., J. of Nucl. Mater, vol. 44 (1972), pp. 161-174.

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