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Title: The Effect of Foaming and Silica Dissolution on Melter Feed Rheology during Conversion to Glass

As the nuclear waste glass melter feed is converted to molten glass, the feed eventually becomes a continuous glass-forming melt in which dissolving refractory constituents are suspended together with numerous gas bubbles. Knowledge of mechanical properties of the melter feed is crucial for understanding the feed-to-glass conversion as it occurs in the cold cap. We measured the viscosity during heating of the feed and correlated it with the independently determined volume fractions of dissolving quartz particles and the gas phase. The measurement was performed with a rotating spindle rheometer on the melter feed heated at 5 K/min starting at several different temperatures. The effect of quartz particles, gas bubbles, and compositional inhomogeneity on the glass-forming melt viscosity was determined by fitting a linear relationship between log viscosity and volume fractions of suspended phases to data.
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Conference: Waste Management 2014 (WM2014 Conference): 40 Years of Meeting Global Radioactive Waste Management Challenges, March 2-6, 2014, Phoenix, Arizona, Paper No. 14476
WM Symposia, Tempe, AZ, United States(US).
Research Org:
Pacific Northwest National Laboratory (PNNL), Richland, WA (US)
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Country of Publication:
United States
Nuclear waste vitrification; Viscosity; Effect of solids and gases on viscosity