Redox and foaming behavior of E-glass melts
conference paper
The effect of the redox state of sulphate fined E-glass batches on the foaming behavior of the melt has been studied by experiments and by thermochemical modelling calculations. The objective of the study is to identify batch-related measures for foam control. It is found that the redox state and SO3 content of the initial melt phase at 1250°C are the key parameters for controlling secondary foam. Oxidized E-glass melts, with relatively high (> 0.1 wt%) SO3-contents in the initial melt phase, are especially prone to excessive foaming. To reduce foam, while maintaining a sufficiently oxidised glass melt with adequate fining efficiency, the amount of sulphate added to the batch can be decreased by replacing a large part of the sulphate by an alternative oxidising agent. From a series of preliminary foaming experiments with alternative oxidants, sodium-perborate appears to have the strongest effect on the decrease of foam.
Topics
TNO Identifier
238265
ISSN
10421122
ISBN
1-57498-156-0
Publisher
American Ceramic Society (ACM)
Source title
Advances in Fusion and Processing of Glass III, 27-31 July 2003, Rochester, NY, USA
Editor(s)
Varner, J.R.
Seward III, T.P.
Schaeffer, H.A.
Seward III, T.P.
Schaeffer, H.A.
Place of publication
Weaterville, Ohio
Pages
71-82
Files
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