Sodium sulphate formed by evaporation from the glass melt is always present as the main part (>70%) of deposits from industrial glass melting furnaces. VUSU obtained 35 analyses of deposits from sheet, flint & amber container, brown manganese & glass brick furnaces in Czech glassworks. It was found that deposits in furnaces melting commercial glasses were formed predominantly of sodium (potassium) sulphate evaporated from the melt, by contaminated disintegrated refractory from the packing, by batch carryover & by volatilisation, which can be controlled by changing the glass melting temperature, the composition & velocity of the furnace gases. It is mainly promoted by the presence of SO2 & Cl; & by higher moisture content in oxy-fuel furnace gases. Batch carryover can be reduced substantially by better batch chargers & doghouses. The corrosion of chamber packing can be prevented by using better refractories.
