Evolution of Crystalline Phases during Feed-to-Glass Conversion.

Kód výsledku v IS VaVaI

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Výsledek na webu

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DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

Evolution of Crystalline Phases during Feed-to-Glass Conversion.

Popis výsledku v původním jazyce

Simulated high-level waste (HLW) feed, prepared with co-precipitated Fe, Ni, Cr, and Mn hydroxides to simulate the formation of spinel, was heated up at temperature-increase rates believed to be close to those the feed experiences in the HLW glass melter. Decomposition, melting, and dissolution of the feed components (such as nitrates and silica) and the formation of intermediate crystalline phases (spinel, sodalite [Na8(AlSiO4)6(NO2)2], and Zr-containing minerals) were observed and characterized usingevolved gas analysis, volume-expansion measurement, optical microscope, scanning electron microscope, thermogravimetric analysis, differential scanning calorimetry, and X-ray diffraction. Nitrates and quartz, the major HLW feed components, were convertedto a glass-forming melt by 880 C. The conversion heat for this reaction was about 280 J/g-feed. A chromium-free spinel formed in the nitrate melt starting from 520 C and eventually dissolved in the borosilicate melt by 1050 C. Sodalite,

Název v anglickém jazyce

Evolution of Crystalline Phases during Feed-to-Glass Conversion.

Popis výsledku anglicky

Simulated high-level waste (HLW) feed, prepared with co-precipitated Fe, Ni, Cr, and Mn hydroxides to simulate the formation of spinel, was heated up at temperature-increase rates believed to be close to those the feed experiences in the HLW glass melter. Decomposition, melting, and dissolution of the feed components (such as nitrates and silica) and the formation of intermediate crystalline phases (spinel, sodalite [Na8(AlSiO4)6(NO2)2], and Zr-containing minerals) were observed and characterized usingevolved gas analysis, volume-expansion measurement, optical microscope, scanning electron microscope, thermogravimetric analysis, differential scanning calorimetry, and X-ray diffraction. Nitrates and quartz, the major HLW feed components, were convertedto a glass-forming melt by 880 C. The conversion heat for this reaction was about 280 J/g-feed. A chromium-free spinel formed in the nitrate melt starting from 520 C and eventually dissolved in the borosilicate melt by 1050 C. Sodalite,

Druh

D - Stať ve sborníku

CEP obor

CI - Průmyslová chemie a chemické inženýrství

OECD FORD obor

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Projekt

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Návaznosti

Z - Vyzkumny zamer (s odkazem do CEZ)

Rok uplatnění

2000

Kód důvěrnosti údajů

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

Název statě ve sborníku

Book of Abstracts.

ISBN

1-57498-116-1

ISSN

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e-ISSN

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Počet stran výsledku

7

Strana od-do

509-511

Název nakladatele

American Ceramic Society

Místo vydání

N/A

Místo konání akce

St. Louis [US]

Datum konání akce

29. 4. 2000

Typ akce podle státní příslušnosti

WRD - Celosvětová akce

Kód UT WoS článku

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