Effect of glass forming additives on low-activity waste feed conversion to glass

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985891%3A_____%2F24%3A00585973" target="_blank" >RIV/67985891:_____/24:00585973 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/60461373:22310/24:43930975 RIV/60461373:22810/24:43930975

Výsledek na webu

<a href="https://doi.org/10.1016/j.jnucmat.2024.155003" target="_blank" >https://doi.org/10.1016/j.jnucmat.2024.155003</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.jnucmat.2024.155003" target="_blank" >10.1016/j.jnucmat.2024.155003</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Effect of glass forming additives on low-activity waste feed conversion to glass

Popis výsledku v původním jazyce

A significant effort was invested in the past to develop and refine mathematical models that relate the composition of nuclear waste glasses with their properties, such as viscosity, electrical conductivity, or chemical durability. However, less attention has been paid to the formulation of the melter feed itself, such as the chemical form and the particle size of the glass forming and modifying additives, which have a significant effect on the feed-to-glass conversion process during melting. To address this issue, we systematically changed the mineral composition of a simulated low-activity waste melter feed and inspected its melting behavior. When substituting minerals with corresponding oxides and hydroxides, we found that different alumina sources (kyanite, gibbsite, boehmite, or corundum) had the strongest effect on the feed melting process, whereas the sources of Ca, Mg, and Zr had little effect. The X-ray diffraction analysis showed that the alumina sources differ in their dissolution kinetics: early dissolving alumina sources, such as gibbsite (Al(OH)3) and boehmite (AlO(OH)), increase the transient glass-forming melt viscosity at early stages, when gases still evolve, causing extended foaming, whereas alumina sources that dissolve at high temperatures, such as kyanite (Al2SiO5) and corundum (Al2O3), keep the transient glass-forming melt viscosity low and lead to a faster foam collapse. Using a viscosity-composition relationship to estimate the viscosity of transient glass-forming melts in the primary foaming range, we found that the primary foam began to collapse at 360 to 800 Pa s, and fully collapsed between 65 and 260 Pa s. This result agrees with our previous studies, according to which, the glass-forming melt viscosity at the cold cap foam bottom ranged from 24 to 85 Pa s.

Název v anglickém jazyce

Effect of glass forming additives on low-activity waste feed conversion to glass

Popis výsledku anglicky

A significant effort was invested in the past to develop and refine mathematical models that relate the composition of nuclear waste glasses with their properties, such as viscosity, electrical conductivity, or chemical durability. However, less attention has been paid to the formulation of the melter feed itself, such as the chemical form and the particle size of the glass forming and modifying additives, which have a significant effect on the feed-to-glass conversion process during melting. To address this issue, we systematically changed the mineral composition of a simulated low-activity waste melter feed and inspected its melting behavior. When substituting minerals with corresponding oxides and hydroxides, we found that different alumina sources (kyanite, gibbsite, boehmite, or corundum) had the strongest effect on the feed melting process, whereas the sources of Ca, Mg, and Zr had little effect. The X-ray diffraction analysis showed that the alumina sources differ in their dissolution kinetics: early dissolving alumina sources, such as gibbsite (Al(OH)3) and boehmite (AlO(OH)), increase the transient glass-forming melt viscosity at early stages, when gases still evolve, causing extended foaming, whereas alumina sources that dissolve at high temperatures, such as kyanite (Al2SiO5) and corundum (Al2O3), keep the transient glass-forming melt viscosity low and lead to a faster foam collapse. Using a viscosity-composition relationship to estimate the viscosity of transient glass-forming melts in the primary foaming range, we found that the primary foam began to collapse at 360 to 800 Pa s, and fully collapsed between 65 and 260 Pa s. This result agrees with our previous studies, according to which, the glass-forming melt viscosity at the cold cap foam bottom ranged from 24 to 85 Pa s.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

20504 - Ceramics

Projekt

<a href="/cs/project/LUAUS23062" target="_blank" >LUAUS23062: Experimentální a matematická analýza vlastností primární sklotvorné taveniny, vývoje plynů, a jejich vztahu k množství vyvinuté primární pěny.</a><br>

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2024

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Journal of Nuclear Materials

ISSN

0022-3115

e-ISSN

1873-4820

Svazek periodika

593

Číslo periodika v rámci svazku

MAY

Stát vydavatele periodika

NL - Nizozemsko

Počet stran výsledku

9

Strana od-do

155003

Kód UT WoS článku

001216160900001

EID výsledku v databázi Scopus

2-s2.0-85187223999