Alternative reductants for foam control during vitrification of high-iron High Level Waste (HLW) feeds

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985891%3A_____%2F23%3A00570896" target="_blank" >RIV/67985891:_____/23:00570896 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/60461373:22310/23:43928232

Výsledek na webu

<a href="https://doi.org/10.1016/j.jnoncrysol.2023.122240" target="_blank" >https://doi.org/10.1016/j.jnoncrysol.2023.122240</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.jnoncrysol.2023.122240" target="_blank" >10.1016/j.jnoncrysol.2023.122240</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Alternative reductants for foam control during vitrification of high-iron High Level Waste (HLW) feeds

Popis výsledku v původním jazyce

Foaming during vitrification of radioactive waste in Joule-Heated Ceramic Melters (JHCM) is exacerbated by trapping of evolving gases, such as CO2, NOx and O2, beneath a viscous reaction layer. Foaming restricts heat transfer during melting. Sucrose is employed as the baseline additive at the Hanford site in Washington State, USA to reduce foaming. Alternative carbon-based reductant additives were explored in simulated, inactive Hanford high-iron HLW-NG-Fe2 feeds, for both their effect on foaming and to give insight to the behaviour of multivalent species in glass melts under different redox conditions. Graphite, coke (93% C), formic acid and HEDTA additives were compared with sucrose, and a feed with no additive. Graphite and coke additions proved most effective in reducing the maximum foam volume by 51 +/- 3% and 54 +/- 2%, respectively, compared with 24 +/- 5% for sucrose. Lower foaming could result in more efficient vitrification in JHCMs. Reductants also affected redox ratios in the multivalent species present in the feed. The order of reduction, Mn3+/Mn2+ > Cr6+/Cr3+ > Ce3+/Ce4+ > Fe3+/Fe2+ was as predicted on the basis of their redox potentials. There is less reduction overall, particularly in the Fe3+> Fe2+, than predicted by the calculations, attributed to the oxygenated atmosphere of the experiments.

Název v anglickém jazyce

Alternative reductants for foam control during vitrification of high-iron High Level Waste (HLW) feeds

Popis výsledku anglicky

Foaming during vitrification of radioactive waste in Joule-Heated Ceramic Melters (JHCM) is exacerbated by trapping of evolving gases, such as CO2, NOx and O2, beneath a viscous reaction layer. Foaming restricts heat transfer during melting. Sucrose is employed as the baseline additive at the Hanford site in Washington State, USA to reduce foaming. Alternative carbon-based reductant additives were explored in simulated, inactive Hanford high-iron HLW-NG-Fe2 feeds, for both their effect on foaming and to give insight to the behaviour of multivalent species in glass melts under different redox conditions. Graphite, coke (93% C), formic acid and HEDTA additives were compared with sucrose, and a feed with no additive. Graphite and coke additions proved most effective in reducing the maximum foam volume by 51 +/- 3% and 54 +/- 2%, respectively, compared with 24 +/- 5% for sucrose. Lower foaming could result in more efficient vitrification in JHCMs. Reductants also affected redox ratios in the multivalent species present in the feed. The order of reduction, Mn3+/Mn2+ > Cr6+/Cr3+ > Ce3+/Ce4+ > Fe3+/Fe2+ was as predicted on the basis of their redox potentials. There is less reduction overall, particularly in the Fe3+> Fe2+, than predicted by the calculations, attributed to the oxygenated atmosphere of the experiments.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

20504 - Ceramics

Projekt

—

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2023

Kód důvěrnosti údajů

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

Název periodika

Journal of Non-Crystalline Solids

ISSN

0022-3093

e-ISSN

1873-4812

Svazek periodika

608

Číslo periodika v rámci svazku

MAY 15 2023

Stát vydavatele periodika

NL - Nizozemsko

Počet stran výsledku

14

Strana od-do

122240

Kód UT WoS článku

000952649200001

EID výsledku v databázi Scopus

2-s2.0-85149618491