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

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985858%3A_____%2F00%3A27020072" target="_blank" >RIV/67985858:_____/00:27020072 - isvavai.cz</a>
Result on the web
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DOI - Digital Object Identifier
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Result language
angličtina
Original language name
Evolution of Crystalline Phases during Feed-to-Glass Conversion.
Original language description
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,
Czech name
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Czech description
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Publication year
2000
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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