Hostname: page-component-788cddb947-nxk7g Total loading time: 0 Render date: 2024-10-19T00:29:18.209Z Has data issue: false hasContentIssue false
  • English
  • Français

Surface Alteration of Sintered Product of Strontium Aluminum Silicate Under Hydrothermal Conditions

Published online by Cambridge University Press:  15 February 2011

H. Mimura ,
A. Koyama  and
K. Akiba
H. Mimura
Affiliation:
Tohoku University, Institute for Advanced Materials Processing, Katahira 2, Aoba-ku, Sendai 980–77, Japan.
A. Koyama
Affiliation:
Tohoku University, Institute for Advanced Materials Processing, Katahira 2, Aoba-ku, Sendai 980–77, Japan.
K. Akiba
Affiliation:
Tohoku University, Institute for Advanced Materials Processing, Katahira 2, Aoba-ku, Sendai 980–77, Japan.
Get access

Abstract

The surface alteration of strontium aluminum silicate has been studied under hydrothermal conditions in connection with the leachability of Sr from solidified radioactive wastes. Samples exposed to a 3 M NaCl solution at 300°C produced a precipitated layer of analcime (NaAISi2O6) with high crystallinity. The normalized leach rates for Sr in 3 M NaCl and 3 M KC1 solutions were found to be less than 10-3 g/cm2.d, yielding high resistance to leaching in these solutions.

On exposure to the CaCl2 solution at 300°C, anorthite (CaAl2Si2O8) was formed on the surface, indicating the replacement of Sr with Ca through isomorphous substitution. In the case of MgCl2 solution, a thick precipitated layer of clinochlore (Mg5Al(Si3Al)O10(OH)8) built up on the outermost surface. This layer serves to depress the migration of Sr, resulting in the deposition of SrCl2 salts in the altered layer.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 353: Symposium – Scientific Basis for Nuclear Waste Management XVIII , 1994 , 863
Copyright
Copyright © Materials Research Society 1995

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. Chapman, N.A., McKinley, I.G., The Geological Disposal of Nuclear Waste (John Wiley & Sons Ltd., New York, 1987)pp. 49–54.Google Scholar
2. Mimura, H., Kanno, T., J. Nucl. Sci. Technol. 22(4), 284–291 (1985).Google Scholar
3. IAEA Technical Report Series 356, 32–34 (1993).Google Scholar
4. Kubota, M., Okada, K., Yamaguchi, I., Morita, Y., Radioactive Waste Management and the Nuclear Fuel Cycle, Vol. 7(3) (Harwood Academic Publishers, 1986) pp. 303–316.Google Scholar
5. Fujiki, Y., Komatsu, Y., Ohta, N., Chem. Lett. 1023 (1980).Google Scholar
6. Mimura, H., Kanno, T., J. At. Energy Soc. Japan, 24(3), 228–236 (1982).Google Scholar
7. Vance, E.R., Ahmad, F.J., Nuclear and Chemical Waste Managemen, Vol.4 (Pergamon Press Ltd., 1983) pp. 171–176.Google Scholar
8. Mimura, H., Shibata, M., Akiba, K., J. Nucl. Sci. Technol. 27(9), 835–843 (1990).Google Scholar
9. Lutze, W., in Radioactive Waste Forms for the Future, edited by Lutze, W. and Ewing, R.C. (North-Holland Physics Publishing, Amsterdam, 1988) pp. 111–115.Google Scholar
10. Kamizono, H., Clark, D.E., Lodding, A.R., J. Nucl. Sci. Technol. 26(4), 441–448 (1989).Google Scholar
11. Breck, D.W., Zeolite Molecular Sieves (Robert E. Krieger Publishing Company Inc., Florida, 1974), p. 135.Google Scholar
12. Adiga, R., Barkatt, A.A., Clark, D.E., in Nuclear Waste Management II Advances in Ceramics-Volume 20, Edited by Clark, D.E., White, W.B. and Machiels, A.J. (The American Ceramic Society, Inc., Westerville, Ohio, 1986) pp. 487–494.Google Scholar
13. Mimura, H., Iijima, K., Akiba, K., J. Nucl. Sci. Technol. 30(11), 1145–1152 (1993).Google Scholar