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Compositional effect on fining and oxygen activity in mixed alkali silicate glasses
Växjö University, Faculty of Mathematics/Science/Technology, School of Technology and Design.
Växjö University, Faculty of Mathematics/Science/Technology, School of Technology and Design.
2007 (English)In: ICG 2007: XXI International Congress on Glass, ICG , 2007, p. 320-Conference paper, Published paper (Refereed)
Abstract [en]

Antimony oxide has been used as fining agent for quite some time as a substitute for arsenic oxide in low temperature furnaces, not reaching temperatures high enough to activate sulphate compounds in the fining process. Due to environmentally issues, a substitution of antimony by a less toxic fining agent is becoming more urgent. However, since all the details of the mechanisms of fining/refining with antimony are not fully known, it is necessary to further study the present mechanisms and substitution possibilities.

This study is done to monitor how changes in glass composition affect the fining result and the oxygen activity of the melt. Numbers of bubbles were determined in order to evaluate the fining efficiency. The oxygen activity measurement is a way to in situ monitor the fining characteristics. Na2O-K2O-CaO-SiO2 glasses were used with constant alkali oxide content but with varying ratio Na2O/K2O. The Sb2O3 content was 0,2 mol% and NaNO3 or KNO3 was added as oxidising agent.

The oxygen activity has been measured electrochemically, both during the fining process and when the melt was in equilibrium with the surrounding atmosphere. To understand the nitrates contribution to the fining, the oxygen activity was measured in melts both with and without nitrate.

Place, publisher, year, edition, pages
ICG , 2007. p. 320-
Keyword [en]
glass, oxygen activity, electrochemsitry, fining
National Category
Materials Chemistry
Identifiers
URN: urn:nbn:se:vxu:diva-4736OAI: oai:DiVA.org:vxu-4736DiVA, id: diva2:204694
Available from: 2007-10-04 Created: 2007-10-04 Last updated: 2010-03-10Bibliographically approved

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CiteExportLink to record
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