ISSN 0862-5468 (Print), ISSN 1804-5847 (online) 

Ceramics-Silikáty 41, (3) 81 - 87 (1997)


THE SIGNIFICANCE OF THE REDOX STATE OF GLASS ON THE BUBBLE BEHAVIOUR IN THE ISOTHERMAL GLASS MELTS
 
Raková Markéta, Němec Lubomír
 
Laboratory of Inorganic Materials of the Institute of Chemical Technology and Institute of Inorganic Chemistry of Academy of Sciences of the Czech Republic, Institute of Chemical Technology, Technická 5, 166 28 Prague, CZ

The mathematical model for the calculation of the oxidation-reduction species distribution in a flowing glass melt under non-isothermal conditions was formulated. The results of calculations show that the initial oxidation-reduction state of a glass melt influences both the rate of bubble removing from the melt and the bubble composition development. The very high or very low values of the redox state accelerate the bubble removing process in glasses refined by sulphates while only high redox values are favourable in glasses refined by oxides. The concentration ratios CO₂/N₂ as well as N₂/Ar in analysed bubbles, used for the identification of bubble sources in a glass melting space, generally grow when the bubble removing process is accelerated.


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