Effect of minor components on vitrification of low-level simulated nuclear waste glasses
Book
·
OSTI ID:225400
- Pacific Northwest Lab., Richland, WA (United States)
Solubility of minor components (Cl, F, P{sub 2}O{sub 5}, SO{sub 3}, and Cr{sub 2}O{sub 3}) in low-level waste (LLW) glasses were determined. The dependency of solubility on glass processing temperature was negligible, but significant on the glass composition. In laboratory scale studies, the effects of minor components on volatility, molten salt segregation, crystallization, and glass melt viscosity were studied. Volatility of molten glass with additions of Cl, F, and SO{sub 3} was significant when the minor components were in excess of their solubility limits, which was in the order: Cl, > SO{sub 3} {>=} F. Higher B{sub 2}O{sub 3} content in glass further enhanced volatilization. Two types of phase segregation were observed among these minor components. For glasses oversaturated with Cl or SO{sub 3}, phase segregation initiated in the melt and then accumulated on the melt surface, which occurred at the glass processing temperature. For glasses over-saturated with F, P{sub 2}O{sub 5} and Cr{sub 2}O{sub 3}, no phase segregation was observed on the melt surface, and crystallization occurred only in the melt. Chlorine and phosphate were found to increase glass melt viscosity, while fluorine had an opposite effect. The melt viscosity data suggested that SO{sub 3} and Cr{sub 2}O{sub 3} played a dual role in glass, depending on glass composition. In a glass with low B{sub 2}O{sub 3} (5 wt%) and high CaO (4 wt%), addition of either increased the melt viscosity, but decreased the melt viscosity in a glass with high boron (9 wt%) and no CaO.
- DOE Contract Number:
- AC06-76RL01830
- OSTI ID:
- 225400
- Report Number(s):
- CONF-950787--
- Country of Publication:
- United States
- Language:
- English
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