Effect of sucrose on foaming and melting behavior of a low-activity waste melter feed

0517110 - ÚSMH 2020 RIV US eng J - Journal Article
Appel, C.J. - Kloužek, Jaroslav - Jani, N. - Lee, S.M. - Dixon, D.R. - Hrma, P. - Pokorný, R. - Schweiger, M. J. - Kruger, A.A.
Effect of sucrose on foaming and melting behavior of a low-activity waste melter feed.
Journal of the American Ceramic Society. Roč. 102, č. 12 (2019), s. 7594-7605. ISSN 0002-7820. E-ISSN 1551-2916
Institutional support: RVO:67985891
Keywords : cold cap * denitration * foaming * low-activity waste * sucrose
OECD category: Ceramics
Impact factor: 3.502, year: 2019
Method of publishing: Open access
https://ceramics.onlinelibrary.wiley.com/doi/abs/10.1111/jace.16675

Reductants, such as sucrose (C12H22O11), are added to nuclear waste melter feeds containing high fractions of nitrates and nitrites to reduce excessive foaming during feed-to-glass conversion, decrease sulfate segregation, and increase technetium retention. The effect of sucrose on foaming and melting reactions during the conversion was examined using the feed volume expansion test, thermogravimetric analysis, evolved gas analysis, x-ray diffraction, and scanning electron microscopy with energy dispersive x-ray spectrometry. Different amounts of sucrose were added to vary the carbon to nitrogen (C/N) ratio in the melter feed. As the C/N ratio increased, the extent of foaming decreased, and the N-2/NO ratio increased in the evolved gas. Significant foam suppression, rapid gas release at approximately 250 degrees C, and reduction in transition metal oxides were observed at C/N > 1.1.
Permanent Link: http://hdl.handle.net/11104/0302395