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Nepheline Crystallization in High-Alumina High-Level Waste Glass

Published online by Cambridge University Press:  30 April 2015

José Marcial ,
John McCloy  and
Owen Neill
José Marcial
Affiliation:
School of Mechanical & Materials Engineering & Materials Science and Engineering Program, Washington State University, Pullman, WA 99164-2920, USA
John McCloy
Affiliation:
School of Mechanical & Materials Engineering & Materials Science and Engineering Program, Washington State University, Pullman, WA 99164-2920, USA
Owen Neill
Affiliation:
Peter Hooper GeoAnalytical Laboratory, School of the Environment Washington State University, Pullman, WA 99164-2812, USA
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Abstract

The understanding of the crystallization of aluminosilicate phases in nuclear waste glasses is a major challenge for nuclear waste vitrification. Robust studies on the compositional dependence of nepheline formation have focused on large compositional spaces with hundreds of glass compositions. However, there are clear benefits to obtaining complete descriptions of the conditions under which crystallization occurs for specific glasses, adding to the understanding of nucleation and growth kinetics and interfacial conditions. The focus of this work was the investigation of the microstructure and composition of one simulant high-level nuclear waste glass crystallized under isothermal and continuous cooling schedules. It was observed that conditions of low undercooling, nepheline was the most abundant aluminosilicate phase. Further undercooling led to the formation of additional phases such as calcium phosphate. Nepheline composition was independent of thermal history.

Keywords

crystal growthscanning electron microscopy (SEM)waste management
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1744: Symposium EE – Scientific Basis for Nuclear Waste Management XXXVIII , 2015 , pp. 85 - 91
Copyright
Copyright © Materials Research Society 2015 

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References

REFERENCES

Amoroso, J.W., Computer Modelling of High-Level Waste Glass Temperatures within DWPF Canisters during Pouring and Cool Down, SRNL-STI-2011-00546.CrossRefGoogle Scholar
McCloy, J.S., Rodriguez, C.P., Windisch, C., Leslie, C., Schweiger, M.J., Riley, B.J., Vienna, J.D., Alkali/Alkaline Earth Content Effects on Properties of High-Alumina Nuclear Waste Glasses, Advances in Materials Science for Environmental and Nuclear Technology 63–76 (2010).CrossRefGoogle Scholar
Jantzen, C.M, Bickford, D.E., Leaching of Devitrified Glass Containing Simulated SRP Nuclear Waste. Mat. Res. Soc. Proc. 44 135–146 (1985).CrossRefGoogle Scholar
Besmann, T.M., Spear, K.E., Beahm, E.C., Assessment of Nepheline Precipitation in Nuclear Waste Glass via Thermochemical Modeling, Mat. Res. Soc. (2000).Google Scholar
Rodriguez, C.P., McCloy, J.S., Schweigher, M.J., Crum, J.V., Winschell, A., Optical Basicity and Nepheline Crystallization in High Alumina Glasses, PNNL-20184 (Feb 2011).Google Scholar
Hrma, P. R., Schweiger, M.J., Arrigoni, B.M., Humrickhouse, C.J., Marcial, J., Moody, A., Rodriguez, C., Tate, R.M., Tincher, B., Effect of Melter-Feed-Makeup on Vitrification Process, PNNL-18374 (2009).Google Scholar
Jantzen, C.M., Brown, K.G., Predicting the Spinel-Nepheline Liquidus for Application to Nuclear Waste Glass Processing. Part II: Quasicrystalline Freezing Point Depression Model, J. Am. Ceram. Soc. 90 1880–1891 (2007).CrossRefGoogle Scholar
Blancher, S.B., D’Arco, P., Fonteilles, M., Pascal, M-L., Evolution of Nepheline from Mafic to Highly Differentiated Members of the Alkaline series: the Messum Complex, Namibia. Mineralogical Magazine, 74(3), 415–432 (2010).CrossRefGoogle Scholar