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The Effect of Temperature on the Redox Constraints for the Processing of High-Level Nuclear Waste into a Glass Waste Form

Published online by Cambridge University Press:  21 February 2011

Henry D. Schreiber ,
Charlotte W. Schreiber ,
Margaret W. Riethmiller  and
J. Sloan Downey
Henry D. Schreiber
Affiliation:
Department of Chemistry, Virginia Military Institute, Lexington, VA 24450
Charlotte W. Schreiber
Affiliation:
Department of Chemistry, Virginia Military Institute, Lexington, VA 24450
Margaret W. Riethmiller
Affiliation:
Department of Chemistry, Virginia Military Institute, Lexington, VA 24450
J. Sloan Downey
Affiliation:
Department of Chemistry, Virginia Military Institute, Lexington, VA 24450
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Abstract

The oxidation-reduction equilibria of selected multivalent elements in an alkali borosilicate glass melt (Savannah River Laboratory frit #131) were measured as a function of the imposed oxygen fugacity over the temperature range from 950°C to 1350°C. Redox constraints on the processing of high-level nuclear waste into the glass melt require that the prevailing oxygen fugacity be about 10−5 to 10−12 Zatm at 950°C, about 10−2 to 10−9 atm at 1150°C, and about 100 to 10−7 atm at 1350°C. Such conditions circumvent foaming under oxidizing situations and metal/sulfide precipitation if the system becomes too reducing. The defined oxygen fugacity ranges correspond to the previously prescribed range of 0.1 to 0.5 for the [Fe2+]/[Fe3+] ratio in the resulting glass, independent of the processing temperature from 950°C to 1350°C.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 176: Symposium U – Scientific Basis for Nuclear Waste Management XIII , 1989 , 419
Copyright
Copyright © Materials Research Society 1990

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References

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