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Liquidus Temperature Model for Hanford High-Level Waste Glasses with High Concentrations of Zirconia

Published online by Cambridge University Press:  03 September 2012

J. V. Crum ,
M. J. Schweiger ,
P. Hrma  and
J. D. Vienna
J. V. Crum
Affiliation:
Pacific Northwest National Laboratory, Richland WA 99352
M. J. Schweiger
Affiliation:
Pacific Northwest National Laboratory, Richland WA 99352
P. Hrma
Affiliation:
Pacific Northwest National Laboratory, Richland WA 99352
J. D. Vienna
Affiliation:
Pacific Northwest National Laboratory, Richland WA 99352
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Abstract

A study was conducted on glasses based on a simulated transuranic waste with high concentrations of ZrO2and Bi2O3 to determine the compositional dependence of primary crystalline phases and liquidus temperature (TL). Starting from a baseline composition, glasses were formulated by changing mass fractions of Al2O3, B2O3, Bi2O3, CeO2, Li2O, Na2O, P2O5, SiO2, and ZrO2, one at a time, while keeping the remaining components in the same relative proportions as in the baseline glass. Liquidus temperature was measured by heat treating glass samples for 24 h in a uniform temperature furnace. The primary crystalline phase in the baseline glass and the majority of the glasses was zircon (ZrSiO4). A change in the concentration of certain components (Al2O3, ZrO2, Li2O, B2O3 and SiO2) changed the primary phase to baddeleyite (ZrO2), while cerium oxide (CeO2) precipitated from glasses with more than 3 wt% CeO2. Zircon TL was strongly increased by Al2O3, Zrb2 and CeO2, and slightly by P2O5 and SiO2; decreased strongly by Li2O and Na2O and moderately by B2O3. A first-order model was constructed for TL as a function of composition for zircon primary crystalline phase glass.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 465: Symposium II – Scienfific Basis for Nuclear Waste Management XX , 1996 , 79
Copyright
Copyright © Materials Research Society 1997

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References

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