Rheology of simulated radioactive waste slurry and cold cap during vitrification

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F60461373%3A22310%2F18%3A43916873" target="_blank" >RIV/60461373:22310/18:43916873 - isvavai.cz</a>
Alternative codes found
RIV/67985891:_____/18:00497134
Result on the web
<a href="https://onlinelibrary.wiley.com/doi/full/10.1111/jace.15755" target="_blank" >https://onlinelibrary.wiley.com/doi/full/10.1111/jace.15755</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1111/jace.15755" target="_blank" >10.1111/jace.15755</a>

Result language
angličtina
Original language name
Rheology of simulated radioactive waste slurry and cold cap during vitrification
Original language description
During the vitrification of radioactive waste in a Joule-heated melter, aqueous melter feed slurry forms a cold cap, a reacting and melting material, which floats on the surface of the molten glass. The rheological behavior of the feed affects cold cap formation and shape, and is vital for modeling the feed-to-melt conversion process. We used slurry feed simulant and fast-dried slurry solids representing the cold cap to investigate the rheological behavior of the feed as it transforms into glass. Both low-temperature and high-temperature rheometry were performed and a new scheme was applied to estimate the feed viscosity. This study shows that the conversion advances in four sequential stages that form distinct regions in the cold cap: (i) a fast-spreading boiling slurry from which water evaporates, (ii) a porous solid region (viscosity > 108 Pa s) containing reacting solids and molten salts, (iii) a plastic region in which glass-forming melt connects the refractory solids (~108 to ~106Pa s), and (iv) a viscous foam layer in which the viscosity drops from ~105 to ~101 Pa s. The implications for the mathematical modeling of the cold cap are discussed.
Czech name
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Czech description
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Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
20504 - Ceramics

Project
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Continuities
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year
2018
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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