Ceramics-Silikáty 44 (2) 61-65 (2000)

THE REDOX DISTRIBUTION AT THE INTERFACE OF GLASS MELTS WITH DIFFERENT OXIDATION STATE

J. Kloužek, J. Ullrich, M. Jiřička, D. Rohanová, T. Tonthat 

A simplified computational model of refining gas transfer through the quiescent plane interface between oxidized and reduced glass melts containing sulfur compounds as refining agents is presented. The results of calculations show no oversaturation of glasses by gases, namely by SO₂, in the vicinity of the interface. This was confirmed by laboratory experiments that did not detect any bubble nucleation in the interface region. However, if the glasses were quickly mixed by stirring, a considerable amount of bubbles evolved in the melt. In addition, high glass oversaturation by SO₂ was calculated from redox equilibria for instantaneously mixed glasses.