Hostname: page-component-68945f75b7-6rp8b Total loading time: 0 Render date: 2024-09-03T14:20:05.225Z Has data issue: false hasContentIssue false
  • English
  • Français

Leach Testing of Waste Glasses Under Near-Saturation Conditions

Published online by Cambridge University Press:  25 February 2011

B. Grambow  and
D. M. Strachan
B. Grambow
Affiliation:
Hahn-Meitner Institut fur Kernforschung Berlin GmbH, FRG;
D. M. Strachan
Affiliation:
Pacific Northwest Laboratory, Richland, WA 99352
Get access

Abstract

Two waste glasses, MCC 76-68 and C31-3, were leached in deionized water and 0.001 M MgCl2 for periods up to 158 days. At 57 days the gel layer was removed from some of the specimens and leaching continued for up to 100 days. Results from leaching in deionized water showed that the gel layer was not protective. Results from leaching in 0.001 M MgCl2 are in good agreement with the predicted results obtained from the use of the PHREEQE geochemical code and with sepiolite [Mg2Si306(OH)4] as the Mg-bearing precipitate. Both B and Si were predicted and observed to increase with increasing glass dissolution while maintaining sepiolite solubility. Both MCC 76-68 and C31-3 glasses showed increased leaching in 0.001 M MgCl2 upon removal of the layer. This suggests that the leaching mechanism is a function of the difference in the silica chemical potential between the glass and the gel layer.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 26: Symposium D – Scientific Basis for Nuclear Waste Management VII , 1983 , 623
Copyright
Copyright © Materials Research Society 1984

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. Wallace, R.M. and Wicks, G.G., Workshop on the Leaching Mechanisms of Nuclear Waste Forms, May 19–21, 1982. J.E. Mendel, compiler, PNL-4382, Pacific Northwest Laboratory, Richland, Washington (1982).Google Scholar
2. Hench, L. and Clark, D.E., “Physical Chemistry of Glass Surfaces,” J. Non-Crystalline Solids 28 83–105 (1978).Google Scholar
3. Barkatt, A., Simmons, J.H., and Macedo, P.B., “Corrosion Mechanisms and Chemical Durability of Glass Media Proposed for the Fixation of Radioactive Wastes.” Nuclear and Chemical Waste Management 2 3–23 (1981).Google Scholar
4. Clark, D.E., Hench, L.L., and Wicks, G.G., “Preliminary Report on a Glass Burial Experiment in Granite.” Second International Symposium on Ceramics in Nuclear Waste Management, American Ceramic Soc. Publishers, Columbus Ohio (1983).Google Scholar
5. Malow, G., “The Mechanisms for Hydrothermal Leaching of Nuclear Waste Glasses: Properties and Evaluation of Surface Layers.” MRS Symposia Proceedings, Vol. 11, Scientific Basis for Nuclear Waste Management V, Lutze ed. Elsevier Science Publ. Co. Inc. (1982).Google Scholar
6. Boult, K.A., Dalton, J.T., Hall, A.R., Hough, A., and Marples, J.A.C., “The Leaching of Radioactive Waste Storage Glasses.” Ceramics in Nuclear Waste Management, CONF-790420, Chikalla, T.D. and Mendel, J.E., eds., Technical Information Center (1979).Google Scholar
7. Grambow, B., “Influence of Saturation on the Leaching of Borosilicate Nuclear Waste Glasses.” XIII Intl. Congress on Glass, Hamburg, 4-9.7.1983 Glastechn.Ber.Sonderband Berlin, Federal Republic of Germany (1983).Google Scholar
8. Pederson, L.R., Buckwalter, C.Q., McVay, G.L., and Riddle, B.L., “Glass Surface Area-to-Solution Volume Ratio and Its Implications to Accelerated Testing,” in Scientific Basis for Nuclear Waste Management VI, Brookins, D.G., ed., North-Holland Publishing, New York, New York (1983).Google Scholar
9. Strachan, D.M., “Results from the Long-Term Use of the MCC-1 Static Leach Test Method.” Nuclear and Chemical Waste Management, December 1983.Google Scholar
10. Grambow, B., “Geochemical Modeling of the Reaction Between Glass and Aqueous Solution.” Presented at: 85th Annual Meeting of the American Ceramic Society, April 24–27, 1983, Chicago, Illinois (1983b).Google Scholar
11. Parkhurst, D.L., Thorstenson, D.C., and Plummer, L.N., “PHREEQE--A Computer Program for Geochemical Calculations.” Water Resources Investigations 80–96, U.S. Geological Survey, Reston, Virginia (1980).Google Scholar
12. Materials Characterization Center, “Nuclear Waste Materials Handbook. Test Methods.” DOE TIC/11400, Pacific Northwest Laboratory,Richland, Washington (1981).Google Scholar
13. Chick, L.A. and Pederson, L.R., “The Relationship Between Reaction Layer Thickness and Leach Rate for Six Nuclear Waste Glasses.” Published elsewhere in this volume (1983).Google Scholar
14. Johnston, J.W. and Daniel, J.L., “Summary Report for the Interlaboratory Round Robin on the MCC-1 Static Leach Test Method.” PNL-4249, Pacific Northwest Laboratory, Richland, Washington (1982).Google Scholar