Optical Basicity and Nepheline Crystallization in High Alumina Glasses

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The purpose of this study was to find compositions that increase waste loading of high-alumina wastes beyond what is currently acceptable while avoiding crystallization of nepheline (NaAlSiO4) on slow cooling. Nepheline crystallization has been shown to have a large impact on the chemical durability of high-level waste glasses. It was hypothesized that there would be some composition regions where high-alumina would not result in nepheline crystal production, compositions not currently allowed by the nepheline discriminator. Optical basicity (OB) and the nepheline discriminator (ND) are two ways of describing a given complex glass composition. This report presents the theoretical and experimental ... continued below

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Rodriguez, Carmen P.; McCloy, John S.; Schweiger, M. J.; Crum, Jarrod V. & Winschell, Abigail E. February 25, 2011.

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Description

The purpose of this study was to find compositions that increase waste loading of high-alumina wastes beyond what is currently acceptable while avoiding crystallization of nepheline (NaAlSiO4) on slow cooling. Nepheline crystallization has been shown to have a large impact on the chemical durability of high-level waste glasses. It was hypothesized that there would be some composition regions where high-alumina would not result in nepheline crystal production, compositions not currently allowed by the nepheline discriminator. Optical basicity (OB) and the nepheline discriminator (ND) are two ways of describing a given complex glass composition. This report presents the theoretical and experimental basis for these models. They are being studied together in a quadrant system as metrics to explore nepheline crystallization and chemical durability as a function of waste glass composition. These metrics were calculated for glasses with existing data and also for theoretical glasses to explore nepheline formation in Quadrant IV (passes OB metric but fails ND metric), where glasses are presumed to have good chemical durability. Several of these compositions were chosen, and glasses were made to fill poorly represented regions in Quadrant IV. To evaluate nepheline formation and chemical durability of these glasses, quantitative X-ray diffraction (XRD) analysis and the Product Consistency Test were conducted. A large amount of quantitative XRD data is collected here, both from new glasses and from glasses of previous studies that had not previously performed quantitative XRD on the phase assemblage. Appendix A critically discusses a large dataset to be considered for future quantitative studies on nepheline formation in glass. Appendix B provides a theoretical justification for choice of the oxide coefficients used to compute the OB criterion for nepheline formation.

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  • Report No.: PNNL-20184
  • Report No.: EMSP-RPT-003
  • Grant Number: AC05-76RL01830
  • DOI: 10.2172/1019213 | External Link
  • Office of Scientific & Technical Information Report Number: 1019213
  • Archival Resource Key: ark:/67531/metadc831007

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Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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  • February 25, 2011

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  • May 19, 2016, 3:16 p.m.

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  • Dec. 6, 2016, 3 p.m.

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Rodriguez, Carmen P.; McCloy, John S.; Schweiger, M. J.; Crum, Jarrod V. & Winschell, Abigail E. Optical Basicity and Nepheline Crystallization in High Alumina Glasses, report, February 25, 2011; Richland, Washington. (digital.library.unt.edu/ark:/67531/metadc831007/: accessed December 13, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.