Hostname: page-component-cd9895bd7-dk4vv Total loading time: 0 Render date: 2024-12-27T02:38:20.575Z Has data issue: false hasContentIssue false
  • English
  • Français

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
Get access

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.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 294: Symposium V – Scientific Basis for Nuclear Waste Management XVI , 1992 , 61
Copyright
Copyright © Materials Research Society 1993

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

REFERENCES

1. Christensen, H., in Scientific Basis for Nuclear Waste Management XIV, edited by Abrajano, T. Jr and Johnson, L. H. (Mater. Res. Soc. Syinp. Proc. 212, Pittsburgh, PA 1991) pp. 213–220.Google Scholar
2. Ollila., K., in Scientific Basis for Nuclear Waste Management XII, edited by Lutze, W. and Ewing, R. (Mater. Res. Soc. Symp. Proc. 127, Pittsburgh, PA 1989) pp. 337–342.Google Scholar
3. Forsyth, R., in Scientific Basis for Nuclear Waste Management XIV, edited by Abrajano, T. Jr and Johnson, L.H., (Mater. Res. Soc. Symp. Proc. 212, Pittsburgh, PA 1991) pp. 177–188.Google Scholar
4. Thomas, G.F. and Till, G., Nucl. Chem. Waste Manag. 5, 141–147 (1984).Google Scholar
5. Sunder, S., Shoesmith, D.W., Johnson, L. H., Bailey, M.G., Wallace, G.J. and Snaglewski, P., in Scientific Basis for Nuclear Waste Management X, edited by Bates, J.K. and Seefeldt, W.B., (Mater. Res. Soc. Symp. Proc. 84, Pittsburgh, PA 1987) pp. 103–113.Google Scholar
6. Shoesmith, D.W., Sunder, S., Bailey, M.G. and Wallace, G.J., Corrosion Science 29, 1115–1128 (1989).Google Scholar
7. Robbins, J.C., Can. Inst. Min. Metall. Bull. 71, 61 (1978).Google Scholar
8. Grenthe, I., Fuger, J., Konings, R.J.M., Lemire, R.J., Muller, A.B., Nguyen-Trung, C., Wanner, H., Chemical Thermodynamics of Uranium, edited by Wanner, H. and Forest, I. (Elsevier Science Publishers, Amsterdam, 1992).Google Scholar
9. Shoesmith, D.W. and Sunder, S., J.Nucl.Mat. 190, 20 (1992).Google Scholar
10. Johnson, L.H., Shoesmith, D.W., Lunansky, G.E., Bailey, M.G. and Tremaine, P.R., Nucl. Technol. 56, 238 (1982).Google Scholar
11. Gray, W.J., in Scientific Basis for Nuclear Waste Management X, edited by Bates, J.K. and Seefeldt, W.B., (Mater. Res. Soc. Symp. Proc. 84, Pittsburgh, PA 1987) pp. 141–152.Google Scholar
12. Bruno, J., Casas, I. and Puigdominech, I., Geochim. et Cosmochim. Acta 55, 647 (1991).Google Scholar
13. Shoesmith, D.W., (private communication).Google Scholar
14. Posey-Dowty, J., Axtmann, E., Crerar, D., Borcsik, M., A. Ronk and Woods, W., Econ. Geol. 82, 184 (1987).Google Scholar
15. Kanevskii, E.A., Radiokhimiya 8, 664 (1966).Google Scholar