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Kinetics of Reduction and Precipitation of U(VI) in the Dissolution of UO2(s) Under Anoxic Conditions in NaCl 5 mol kg−1. Influence of Metallic Iron

Published online by Cambridge University Press:  10 February 2011

J. Giménez ,
M. Molera ,
I. Casas ,
M.E. Torrero  and
J. de Pablo
J. Giménez
Affiliation:
Department of Chemical Engineering, Universitat Politécnica de CatalunyaE-08028 Barcelona.Spain
M. Molera
Affiliation:
Department of Chemical Engineering, Universitat Politécnica de CatalunyaE-08028 Barcelona.Spain
I. Casas
Affiliation:
Department of Chemical Engineering, Universitat Politécnica de CatalunyaE-08028 Barcelona.Spain
M.E. Torrero
Affiliation:
Department of Chemical Engineering, Universitat Politécnica de CatalunyaE-08028 Barcelona.Spain
J. de Pablo
Affiliation:
Department of Chemical Engineering, Universitat Politécnica de CatalunyaE-08028 Barcelona.Spain
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Abstract

Experiments of spent fuel dissolution performed in presence of iron show, for uranium as well as for some radionuclides, lower final concentrations than measured in similar experiments but in absence of iron. So far, only the final concentrations obtained in these experiments have been published. In this work, we have focused our study on the reduction of uranium (VI) due to the presence of iron and the subsequent precipitation of Uranium (IV) due to its lower solubility. This behavior has been confirmed using a Scanning Electron Microscope by observing an uranium phase precipitated on the iron surface and assuming, under the experimental conditions, that it most likely corresponds to U02(s). We have modeled this process assuming a first-order kinetic.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 506: Symposium – Scientific Basis for Nuclear Waste Management XXI , 1997 , 115
Copyright
Copyright © Materials Research Society 1998

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References

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