Abstract
Batches made with a variety of precursors were subjected to thermogravimetric analysis. The baseline modifications included an all-nitrate batch with sucrose addition, an all-carbonate batch, and batches with different sources of alumina. All batches were formulated for a single glass composition (a vitrified, simulated, high-alumina, high-level waste). Batch samples were heated from ambient temperature to 1,200°C at constant heating rates ranging from 1 to 50 K/min. Major gas-evolving reactions began at temperatures just above 100°C and were virtually complete by 650°C. Activation energies for major reactions were obtained with the Kissinger method. A rough model for the overall kinetics of the batch conversion was developed to be eventually applied to a mathematical model of the cold cap.
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