Melt Rate Improvement for High-Level Waste Glass

Matyas, Josef ; Hrma, Pavel R. ; Kim, Dong-Sang

Pacific Northwest National Laboratory (U.S.)

关键词: Waste Forms;    36 Materials Science;    Melting;    Viscosity;    Thermal Diffusivity High-Level Waste, Melt Rate;   

DOI  :  10.2172/860127
RP-ID  :  PNNL-14003
RP-ID  :  AC05-76RL01830
RP-ID  :  860127

美国|英语

来源: UNT Digital Library

【 摘 要 】

This report summarizes results of research accomplished during the first year of the 3-year project. The data presented in this report have been gathered to support work on the mathematical modeling of waste-glass melters. At this stage, only a qualitative description and interpretation of the observed phenomena has been attempted. Two Savannah Rive feeds were used for the study. These feeds were subjected to thermal gravimetric analysis, differential thermal analysis, differential scanning calorimetry, evolved gas analysis with volume-expansion monitoring, modified reboil test, quantitative X-ray diffraction, scanning electron microscopy with energy dispersive spectroscopy, wet chemical analysis, and M?ssbauer spectroscopy. Glass viscosity was also measured. Finally, it was recommended to use melt-rate furnace test data to measure thermal diffusivity of the feed. Though both feed were reduced to prevent oxygen evolution from the melt, oxygen evolved form one of the melts and COx evolved from both. Hence, foam is likely to form under the cold cap even when the feed is reduced. An important difference between the feeds was in the melt viscosity at the temperature at which the melt interfaces the cold cap. It was suggested that low viscosity destabilizes foam under the cold cap, thus enhancing the rate of melting.