The behavior of melter feed (a mixture of nuclear waste and glass-forming additives) duringwaste-glass processing has a significant impact on the rate of the vitrification process. Westudied the effects of silica particle size and sucrose addition on the volumetric expansion(foaming) of a high-alumina feed and the rate of dissolution of silica particles in feed samplesheated at 5°C/min up to 1200°C. The initial size of quartz particles in feed ranged from 5 to 195μm. The fraction of the sucrose added ranged from 0 to 0.20 g per g glass. Extensive foamingoccurred only in feeds with 5-μm quartz particles; particles ≥150 μm formed clusters. Particlesof 5 μm completely dissolved by 900°C whereas particles ≥150 μm did not fully dissolve evenwhen the temperature reached 1200°C. Sucrose addition had virtually zero impact on bothfoaming and the dissolution of silica particles.
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