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Kinetically Controlled Dissolution of UO2(s) Under Oxidizing Conditions. A Combined Dissolution-Okidation Model.

Published online by Cambridge University Press:  01 January 1992

Ignasi Casas,
J. Gimenez,
V. Marti,
M.E. Torrero and
J. De Pabloc
Ignasi Casas
Affiliation:
Department of Chemical Engineering, Universitat Politècnica Catalunya, E-08028 Barcelona, Spain
J. Gimenez
Affiliation:
Department of Chemical Engineering, Universitat Politècnica Catalunya, E-08028 Barcelona, Spain
V. Marti
Affiliation:
Department of Chemical Engineering, Universitat Politècnica Catalunya, E-08028 Barcelona, Spain
M.E. Torrero
Affiliation:
Department of Chemical Engineering, Universitat Politècnica Catalunya, E-08028 Barcelona, Spain
J. De Pabloc
Affiliation:
Department of Chemical Engineering, Universitat Politècnica Catalunya, E-08028 Barcelona, Spain
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Abstract

The release of uranium from three samples of UO2(S) with different particle sizes (100–300 μm, 900–1100 μm, pellet) has been studied as a function of time. In all cases, the same pH, ionic medium, temperature, and oxygen partial pressure were used.

Two distinctive trends were observed in the three cases, with a relatively fast initial uranium release followed, after 10–15 days, by a slower dissolution rate. The experiments were continued during 200 days; no change in the second dissolution rate was noticed.

The uranium released as a function of time has been successfully fitted with a mathematical expression which combines an oxidation-dissolution mechanism.

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References

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