Effect of composition and temperature on the properties of High-Level Waste (HLW) glasses melting above 1200{degrees}C (Draft)

Vienna, J.D.; Hrma, Pavel R.; Schweiger, M.J.

doi:10.2172/212394

Cited by 23 publications

(39 citation statements)

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“…• CVS3 glasses: These glasses were high-melting-temperature glasses previously reported (Vienna et al 1996). Quantitative XRD data is included in that report.…”

Section: Discussionmentioning

confidence: 99%

Optical Basicity and Nepheline Crystallization in High Alumina Glasses

Rodriguez¹,

McCloy²,

Schweiger³

et al. 2011

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SummaryThe 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 (NaAlSiO 4 ) 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.v

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“…• CVS3 glasses: These glasses were high-melting-temperature glasses previously reported (Vienna et al 1996). Quantitative XRD data is included in that report.…”

Section: Discussionmentioning

confidence: 99%

Optical Basicity and Nepheline Crystallization in High Alumina Glasses

Rodriguez¹,

McCloy²,

Schweiger³

et al. 2011

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“…very StrOngeffeCt on rB and rN~until concentrations approachhig 4.5 12KiSS0/o, where the effeCt iS seen to become significantly wedcer (Vienna et al 1995). Fi~e 3.1 illustrates the impact of changing the A1203concentration on the rN~values of two previously studied HAW glasses.…”

Section: 2mentioning

confidence: 91%

“…These compositions are estimates horn 2.1 INEEL staff assuming fill separations of the waste into high-and low-activity fractions. The databases for glass-property compositions and the predictive tools developed for Hanford (Hrma et al 1994;Vienna et al 1995;Crum et al 1997;Mika et al 1997;Feng et al 1995), Savannah River (Jantzen et al 1995) and West Valley (Piepel and Redgate 1997;Reimus et al 1988;Chick et al 1984;Bynnell 1988) are not adequate to calculate acceptable glass compositions for the high-zirconi~low-iron, INEEL HAW glasses. Five glasses were fabricated with 17.7 to 19 mass% of the BL waste.…”

Section: Product Quality Qmentioning

confidence: 99%

Glass Formulation for Idaho National Engineering and Environmental Laboratory Zirconia Calcine High-Activity Waste

Vienna¹,

Peeler²,

Plaisted³

et al. 2000

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“…However, heat treatment of this glass (42A-HT) reduced the glass durability only slightly. In addition to Volf, Vienna et al 8 showed that in some glasses determined to be homogeneous, a small alumina addition can significantly increase the glass durability. Plotting the compositions of the 42 and 42A glasses on the NazO-B203-Si02 ternary phase diagram, they fall into the region of phase separation where interconnected phases are expected.…”

Section: Westinghouse Savannah River Companymentioning

confidence: 99%

Technical Status Report on the Effect of Phosphate and Aluminum on the Development of Amorphous Phase Separation in Sodium

Cozzi¹

1998

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In reference to subtask A of the TFA Optimized Waste Loading Task TTP #SR1-6-WT-31, a series of laboratory testes were performed to support the goal of opening the high level waste processing window in terms of amorphous phase separation. These tests evaluate the ability of phosphate to induce and aluminum to suppress the formation of glass-inglass phase separation in select borosilicate glass systems. TECHNICAL STATUS REPORT ON THE EFFECT OF PHOSPHATE AND ALUMINUM ON THE DEVELOPMENT OF AMORPHOUS PHASE SEPARATION IN SODIUM BOROSILICATE GLASSES (U)A.I). Cozzi. OBJECTIVEThe objective of the Tank Focus Area "Optimize Waste Loading" task is to enhance the definition of the acceptable processing window for high-level waste vitrification plants. One possible manner in which the acceptable processing window maybe enhanced is by reducing the uncertainty of various compositional/property models through a specifically defined experimental plan. A reduction in model uncertainty can reduce limitations on current acceptance constraints and may allow for a larger processing or operational window. Enhanced compositiordproperty model predictions coupled with an increased waste loading may decrease the processing time and waste glass disposal costs (i.e., overall lifecycle costs). One of the compositional/property models currently being evaluated by the. Tanks Focus Area is related to the development of amorphous phase separation in multi-component borosilicate glasses.Described in this report is the current status for evaluating the effect of phosphorus and alumina on both simple sodium borosilicate and high-level waste glasses on the formation of amorphous phase separation. The goal of this subtask is to increase the understanding of the formation of phase separation by adding significant amounts (3-5 wt. %) of phosphorus and alumina to wellcharacterized glasses. Additional scope includes evaluating the effects of thermal history on the formation of amorphous phase separation and durability of select glasses.The development of data, understanding, and quantitative description for composition and kinetic effects on the development of amorphous phase separation will continue in FY99. This effort will provide insight into the compositional and thermal effects on phase stability and will lead to a better understanding of the methods used to predict the development of amorphous phase separation in HLW glasses.

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Effect of composition and temperature on the properties of High-Level Waste (HLW) glasses melting above 1200{degrees}C (Draft)

Cited by 23 publications

References 0 publications

Optical Basicity and Nepheline Crystallization in High Alumina Glasses

Optical Basicity and Nepheline Crystallization in High Alumina Glasses

Glass Formulation for Idaho National Engineering and Environmental Laboratory Zirconia Calcine High-Activity Waste

Technical Status Report on the Effect of Phosphate and Aluminum on the Development of Amorphous Phase Separation in Sodium

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