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ChemInform Abstract: Oxidation of UO2 in Molten Alkali-Metal Carbonate Mixtures: Formation of Uranates and Diuranates.

✍ Scribed by V. VOLKOVICH; T. R. GRIFFITHS; D. J. FRAY; M. FIELDS; P. D. WILSON

Publisher: John Wiley and Sons
Year: 2010
Weight: 27 KB
Volume: 28
Category: Article
ISSN: 0931-7597
DOI: 10.1002/chin.199715032

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✦ Synopsis

Oxidation of UO2 in Molten Alkali-Metal Carbonate Mixtures: Formation of Uranates and Diuranates.

-The title reaction is studied systematically in the temp. range 723-1123 K under various oxidizing conditions. In the presence of oxygen a mixture of mono-and diuranates is formed. At high temp. monouranates are favored. The reaction rate is markedly increased by addition of alkali metal nitrates. Oxygen bubbling through the melt has a higher stimulating effect on the reaction rate than air bubbling or just stirring of the melt. The oxidation of UO2 proceeds via formation of intermediate peroxide and/or superoxide ions in the carbonate melt. -

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