Effect of sucrose on technetium and rhenium retention during vitrification of low-activity wastes

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985891%3A_____%2F22%3A00562230" target="_blank" >RIV/67985891:_____/22:00562230 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/60461373:22310/22:43925590

Výsledek na webu

<a href="https://ceramics.onlinelibrary.wiley.com/doi/10.1111/jace.18701" target="_blank" >https://ceramics.onlinelibrary.wiley.com/doi/10.1111/jace.18701</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1111/jace.18701" target="_blank" >10.1111/jace.18701</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Effect of sucrose on technetium and rhenium retention during vitrification of low-activity wastes

Popis výsledku v původním jazyce

Sucrose (C12H22O11) has been used in low-activity waste (LAW) melter feeds containing large fractions of nitrates, nitrites, or both because it facilitates foam suppression and denitration. This study focused on the effect of sucrose in LAW feeds on technetium (Tc) and rhenium (Re) retention. The amount of sucrose added in feeds was varied to differentiate the carbon-to-nitrogen mole ratio (C/N ratio). The results show that larger sucrose addition (higher C/N ratio) enhances Tc and Re retention. Reducing conditions induced by sucrose decomposition and early chemical reactions between sucrose and NaNO3/NaNO2 are expected to increase Tc and Re retention. However, high sucrose addition decreased sulfur (S) retention slightly because sodium sulfate decomposes in reducing conditions at lower temperature. This early sulfate decomposition can affect Tc and Re retention partly because these species can be soluble in sulfate phases. This correlation indicates that the decrease of sulfate phases in the glass by early decomposition can reduce the solubility of Tc and Re in the sulfate phases, which may increase Tc and Re retention in the glass. In addition, continuous gas evolution and vigorous foaming at the foaming temperature range of 700-900 degrees C may influence Tc and Re retention process interrupting retention or facilitating volatilization.

Název v anglickém jazyce

Effect of sucrose on technetium and rhenium retention during vitrification of low-activity wastes

Popis výsledku anglicky

Sucrose (C12H22O11) has been used in low-activity waste (LAW) melter feeds containing large fractions of nitrates, nitrites, or both because it facilitates foam suppression and denitration. This study focused on the effect of sucrose in LAW feeds on technetium (Tc) and rhenium (Re) retention. The amount of sucrose added in feeds was varied to differentiate the carbon-to-nitrogen mole ratio (C/N ratio). The results show that larger sucrose addition (higher C/N ratio) enhances Tc and Re retention. Reducing conditions induced by sucrose decomposition and early chemical reactions between sucrose and NaNO3/NaNO2 are expected to increase Tc and Re retention. However, high sucrose addition decreased sulfur (S) retention slightly because sodium sulfate decomposes in reducing conditions at lower temperature. This early sulfate decomposition can affect Tc and Re retention partly because these species can be soluble in sulfate phases. This correlation indicates that the decrease of sulfate phases in the glass by early decomposition can reduce the solubility of Tc and Re in the sulfate phases, which may increase Tc and Re retention in the glass. In addition, continuous gas evolution and vigorous foaming at the foaming temperature range of 700-900 degrees C may influence Tc and Re retention process interrupting retention or facilitating volatilization.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

20504 - Ceramics

Projekt

<a href="/cs/project/LTAUSA18075" target="_blank" >LTAUSA18075: Analýza pěnění – kritického procesu při přeměně kmene na sklo</a><br>

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2022

Kód důvěrnosti údajů

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

Název periodika

Journal of the American Ceramic Society

ISSN

0002-7820

e-ISSN

1551-2916

Svazek periodika

105

Číslo periodika v rámci svazku

12

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

13

Strana od-do

7321-7333

Kód UT WoS článku

000841275200001

EID výsledku v databázi Scopus

2-s2.0-85135877765