Batches made with a variety of precursors were subjected to thermo-gravimetric analysis. The baseline modifications included all-nitrate batch with sucrose addition, 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 the ambient temperature to 1200°C at constant heating rates ranging from 1 K/min 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’s 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.
Revised: September 10, 2013 |
Published: January 21, 2013
Citation
Pierce D.A., P.R. Hrma, and J. Marcial. 2013.Thermal Analysis of Waste Glass Batches: Effect of Batch Makeup on Gas-Evolving Reactions. In Thermal Analysis of Micro, Nano- and Non-Crystalline Materials: Transformation, Crystallization, Kinetics and Thermodynamics. Hot Topics in Thermal Analysis and Calorimetry, edited by J Sestak and P Simon. 429-440. Dordrecht:Springer.PNNL-SA-78036.