Liquidus temperature model for Hanford high-level waste glasses with high concentrations of zirconia
Conference
·
OSTI ID:572017
- Pacific Northwest National Lab., Richland, WA (United States)
A study was conducted on glasses based on a simulated transuranic waste with high concentrations of ZrO{sub 2} and Bi{sub 2}O{sub 3} to determine the compositional dependence of primary crystalline phases and liquidus temperature (T{sub L}). Starting from a baseline composition, glasses were formulated by changing mass fractions of Al{sub 2}O{sub 3}, B{sub 2}O{sub 3}, Bi{sub 2}O{sub 3}, CeO{sub 2}, Li{sub 2}O, Na{sub 2}O, P{sub 2}O{sub 5}, SiO{sub 2}, and ZrO{sub 2}, 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 (ZrSiO{sub 4}). A change in the concentration of certain components (Al{sub 2}O{sub 3}, ZrO{sub 2}, Li{sub 2}O, B{sub 2}O{sub 3}, and SiO{sub 2}) changed the primary phase to baddeleyite (ZrO{sub 2}), while cerium oxide (CeO{sub 2}) precipitated from glasses with more than 3 wt% CeO{sub 2}. Zircon T{sub L} was strongly increased by Al{sub 2}O{sub 3}, ZrO{sub 2} and CeO{sub 2}, and slightly by P{sub 2}O{sub 5} and SiO{sub 2}; decreased strongly by Li{sub 2}O and Na{sub 2}O and moderately by B{sub 2}O{sub 3}. A first-order model was constructed for T{sub L} as a function of composition for zircon primary crystalline phase glass.
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- DOE Contract Number:
- AC06-76RL01830
- OSTI ID:
- 572017
- Report Number(s):
- CONF-961202--
- Country of Publication:
- United States
- Language:
- English
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