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Redox Systematics in Model Glass Compositions from West Valley

Published online by Cambridge University Press:  01 January 1992

Henry D. Schreiber ,
Charlotte W. SCHREIBER  and
Cary C. Ward
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
Cary C. Ward
Affiliation:
Department of Chemistry, Virginia Military Institute, Lexington, VA 24450
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Abstract

At a processing temperature of 1150°C for model West Valley glass compositions, the prescribed range of oxygen fugacities needed to achieve an [Fe2+]/[Fe3+] of 0.1 to 0.5 is 10−4 to 10−7 atm. Establishment of the Fe2+-Fe0 equilibrium, resulting in metal precipitation from the melt, occurs at oxygen fugacities lower than 10−11 atm at this temperature. The target processing range as defined by the iron redox ratio is equally valid at both lower and higher temperatures (±100°C). Elevations of the concentrations of redox-active components to I wt% Cr2O3, 1 wt% NiO, 1 wt% CuO, 1 wt% CeO2, and 4 wt% Mn2O3 in the waste glass will not affect the redox limits as established by the iron redox ratio of 0.1 to 0.5; these limits provide sufficiently large margins of safety to assure no stabilization of reduced or oxidized forms of these elements.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 294: Symposium V – Scientific Basis for Nuclear Waste Management XVI , 1992 , 87
Copyright
Copyright © Materials Research Society 1993

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References

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