¹ Joint Laboratory for Chemistry and Technology of Silicates, Czechoslovak Academy of Sciences, and Institute of Chemical Technology, Prague
² Department of Silicate Technology at the Ural Polytechnical Institute of S. M. Kirov Sverdlovsk, USSR

Formulas for the rate of congruently proceeding dissolution in a binary system are applied to experimental results of measuring the rate of surface and subsurface corrosion taking place incongruently in a ternary system. This procedure is based on the assumption that the heterogeneous layers arising on the refractory material in the course of corrosion are motionless and that the ternary system, in which the corrosion is taking place, can be reduced to a pseudobinary one. The reduction is effected in two ways:

1. By plotting a pseudobinary diagram along a hypothetical linear concentration path,

2. By the method based on assumed independence of the melt composition at the phase boundary with respect to the initial glass composition.

Using these two methods, the effective binary diffusion coefficients and the factors expressing the effects of the amount of dissolved mullite on glass melt density are computed from the experimental results. The values obtained are within the expected limits, this bearing evidence to the fact that both methods represent a suitable first approximation in the analyses of corrosion processes in more complex systems.

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