Effect of Al and Fe sources on conversion of high-level nuclear waste feed to glass

0551246 - ÚSMH 2023 RIV NL eng J - Journal Article
Marcial, J. - Kloužek, Jaroslav - Vernerová, Miroslava - Ferkl, P. - Lee, S. - Cutforth, D. - Hrma, P. - Kruger, A. - Pokorný, Richard
Effect of Al and Fe sources on conversion of high-level nuclear waste feed to glass.
Journal of Nuclear Materials. Roč. 559, February 2022 (2022), č. článku 153423. ISSN 0022-3115. E-ISSN 1873-4820
Institutional support: RVO:67985891
Keywords : cold-cap reactions * molten glass * melting rate * melter feed * particle size * silica * viscosity * batch * dissolution * alumina
OECD category: Ceramics
Impact factor: 3.1, year: 2022
Method of publishing: Limited access
https://www.sciencedirect.com/science/article/pii/S0022311521006437?via%3Dihub

Pilot-scale melter testing has shown that Al and Fe sources in high-level nuclear waste feeds influence the glass production rate. To examine melting behaviors of these feeds, we employed X-ray diffraction, differential scanning calorimetry, thermo-gravimetric analysis, particle size analysis, and the feed expansion experiments. Both the chemical form and the particle size of the Al and Fe sources affect the rate of melting through their effects on the conversion enthalpy and the primary foam formation that control the energy demand for melting and the heat accepted by the cold cap. The particle size of gibbsite controls the rate of alumina incorporation in the initial glass-forming melt that in turn, through its effect on viscosity, affects the rate of dissolution of silica particles, thus governing the glass melt fraction, open pore closure, and primary foam formation. Since the temperature of primary foam collapse limits the heat flow to the cold cap, the gibbsite (and generally Al source) particle size ultimately influences the glass production rate that increases as the particle size increases. Variation in the Fe source affects the glass production rate mainly through their content of chemically bound water.
Permanent Link: http://hdl.handle.net/11104/0332095