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Mechanism of Sulfate Segregation during Glass Melting

Published online by Cambridge University Press:  11 February 2011

Pavel Hrma ,
John D. Vienna  and
Joel S. Ricklefs
Pavel Hrma
Affiliation:
Pacific Northwest National Laboratory, Richland, WA 99352–999, U.S.A.
John D. Vienna
Affiliation:
Pacific Northwest National Laboratory, Richland, WA 99352–999, U.S.A.
Joel S. Ricklefs
Affiliation:
Pacific Northwest National Laboratory, Richland, WA 99352–999, U.S.A.
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Abstract

Sulfate retention in glass during the vitrification process can be as low as 1/3 of the solubility limit, or can exceed the solubility limit if suspended in the glass in the form of droplets. This study is focused on the mechanism of incorporating and segregating sodium sulfate during the melting of an alkali-alumino-borosilicate glass batch. Batches were ramp heated at 4°C/min to temperatures ranging from 600°C to 1050°C and fractured for examination. Observation of the melts showed that as the batch temperature increases and the primary oxo-anionic, predominantly nitrate melt decomposes, the sulfate residue accumulates inside gas bubbles and is transported in them to the melt surface, where it remains segregated. The degree of sulfate incorporation into the final glass depends on the relative rates of sulfate dissolution in the borosilicate melt and sulfate lifting inside bubbles.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 757: Symposium II – Scientific Basis for Nuclear Waste Management XXVI , 2002 , II5.5
Copyright
Copyright © Materials Research Society 2003

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References

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