Effect of sucrose on the oxidation-reduction conditions and retention of rhenium during vitrification of low-activity waste

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985891%3A_____%2F23%3A00567778" target="_blank" >RIV/67985891:_____/23:00567778 - isvavai.cz</a>
Alternative codes found
RIV/60461373:22310/23:43928229
Result on the web
<a href="https://doi.org/10.1016/j.jnucmat.2022.154155" target="_blank" >https://doi.org/10.1016/j.jnucmat.2022.154155</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1016/j.jnucmat.2022.154155" target="_blank" >10.1016/j.jnucmat.2022.154155</a>

Result language
angličtina
Original language name
Effect of sucrose on the oxidation-reduction conditions and retention of rhenium during vitrification of low-activity waste
Original language description
Technetium speciation and solubility during nuclear waste vitrification are affected by oxygen partial pressure in the melt. Thus, reducing agents such as sucrose, which are routinely added to nuclear waste feeds to repress foaming, can significantly affect the volatilization of Tc and increase its retention in glass. Using Re as a surrogate for Tc, we measured the effect of sucrose addition to two low-activity waste melter feeds on the Re retention, oxygen partial pressure, and iron redox as functions of temperature. As expected, Re retention in glass increased as the sucrose content increased. This is attributed to sucrose reaction with nitrates and nitrites in the feed. Destruction of nitrates and nitrites reduces the salt phase fraction and thus likely promotes Re diffusion into the glass-forming melt. In agreement with available literature, we discuss that a modest increase in the sucrose content (compared to current practice) can significantly improve the Tc retention without reducing Fe 2 + to metal. (c) 2022 Elsevier B.V. All rights reserved.
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
—
OECD FORD branch
20504 - Ceramics

Project
<a href="/en/project/LTAUSA18075" target="_blank" >LTAUSA18075: ANALYSIS OF FOAMING – CRITICAL BATCH-TO-GLASS CONVERSION PROCESS</a><br>
Continuities
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year
2023
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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