Analysis of advanced and fast fining processes for glass melts
conference paper
The removal of dissolved gases and gas bubbles from viscous glass melts is one of the main process steps decisive for the glass quality and for the required residence time of the glass melt in glass furnaces. Models, describing the transfer of gas species from the melt phase to bubbles or reverse, can be applied to study the effect of several process parameters on the removal of gas bubbles from glass melts in industrial processes. Such parameters are: (1) the height of the tank in the fining section; (2) the temperature level; (3) oxidation state of the glass; (4) concentrations of fining agents added to the batch; (5) water content of the melt, which is closely related to water vapor pressure in furnace atmosphere; (6) application of sub-atmospheric furnace pressures; (7) pre-conditioning of the melt by other gases. Examples of the effect of oxidation state of the melt, preconditioning of the melt by helium gas, reduced furnace pressure and amounts of fining agents, or a combination of two fining agents on the removal of small seeds (fine bubbles) will be presented. Results of some fining tests are presented, showing the effect of additions of polyvalent ions to sulfate refined melts and the effect of pre-conditioning of the glass melt with highly soluble gas species on the efficiency of seed removal.
Topics
TNO Identifier
280185
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
3-34
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