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The effects of melting reactions on laboratory-scale waste vitrification

Published online by Cambridge University Press:  03 March 2011

Peter A. Smith ,
John D. Vienna  and
Pavel Hrma
Peter A. Smith*
Affiliation:
Department of Materials Science, Pacific Northwest Laboratory, Box 999, MS P7-14, Richland, Washington 99352
John D. Vienna
Affiliation:
Department of Materials Science, Pacific Northwest Laboratory, Box 999, MS P7-14, Richland, Washington 99352
Pavel Hrma
Affiliation:
Department of Materials Science, Pacific Northwest Laboratory, Box 999, MS P7-14, Richland, Washington 99352
*
a)Author to whom all correspondence should be sent.
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Abstract

At the U.S. Department of Energy's Hanford Site, processes are being developed to vitrify waste generated during nuclear materials processing. One of the wastes slated for vitrification is known as neutralized current acid waste (NCAW). The batch chemistry of simulated NCAW was varied with oxidants and reductants. Untreated, formated, nitrated, or sugar-added samples were combined with frit to produce melter feed. Offgas measurements of the formated melter feed showed that formates decomposed at temperatures too low for participation in melt redox reactions. Sugar pyrolyzed and produced CO and H2 at temperatures exceeding 665 °C. For the sugar-added samples, the glass quenched from 1200 °C produced an Fe2+ /ΣFe of 0.79. The measured iron redox ratios from the glasses made from untreated, formated, and nitrated wastes were essentially indistinguishable (0.0024 at 1000 °C and 0.032 at 1200 °C). However, the batch chemistry affected volume expansion and the reaction paths.

Type
Articles
Information
Journal of Materials Research , Volume 10 , Issue 8 , August 1995 , pp. 2137 - 2149
Copyright
Copyright © Materials Research Society 1995

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