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Hydrothermal Methods as a New Way of Actinide Phosphate Preparation

Published online by Cambridge University Press:  19 October 2011

Nicolas Clavier ,
Nicolas Dacheux ,
Gilles Wallez  and
Michel Quarton
Nicolas Clavier
Affiliation:
[email protected], Institut de Chimie Séparative de Marcoule, CNRS UMR 5257, Bagnols / Cèze, 30207, France
Nicolas Dacheux
Affiliation:
[email protected], Groupe de Radiochimie, IPNO - Bât. 100, Univ. Paris-Sud, Orsay, 91406, France
Gilles Wallez
Affiliation:
[email protected], Univ. Pierre et Marie Curie-Paris 6, Chimie de la matière condensée, CNRS UMR 7574, 4 Place Jussieu, Paris, 75005, France
Michel Quarton
Affiliation:
[email protected], Univ. Pierre et Marie Curie-Paris 6, Chimie de la matière condensée, CNRS UMR 7574, 4 Place Jussieu, Paris, 75005, France
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Abstract

Precipitation processes driven in hydrothermal conditions were applied to the preparation of phosphate-based ceramics. Three systems composed by a crystallized precursor linked with a high temperature compound were particularly examined: M(OH)PO4 / M2O(PO4)2 (M = Th, U), MPO40.5 H2O / MPO4 (M = La - Dy) and Th2-x/2Anx/2(PO4)2(HPO4) H2O / β-Th4-xAnx(PO4)4P2O7 (M = U, Np, Pu). A significant improvement of several physico-chemical properties of the powders, especially in the sintering capability and the homogeneity of the final solids was evidenced when starting from the precursors. Furthermore, these phases were also found to control the solubility of lanthanides and actinides during leaching experiments when reaching the saturation conditions in the solution.

Keywords

actinidehydrothermalwaste management
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 985: Symposium NN – Scientific Basis for Nuclear Waste Management XXX , 2006 , 0985-NN04-08
Copyright
Copyright © Materials Research Society 2007

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References

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