The corrosion mechanism of fused-cast zirconium corundum bricks is mainly due to the fact that the upper structure of the glass furnace is the heat conductor that propagates the combustion flame and is the guarantee for balancing the temperature in the kiln and exhausting exhaust gas. In order to reduce heat dissipation losses, thermal insulation measures must be taken for the upper structure of the furnace, which will lead to an increase in the ambient temperature of the upper structure of the glass furnace.
In addition, when the glass kiln switched from air-assisted combustion to all-oxygen combustion technology, the chemical composition of the space atmosphere where the upper structure was located changed greatly. The volume concentration of water vapor increased approximately three times, and the volume concentration of alkali volatiles increased Increased to 3~6 times. In the case of high temperature, water vapor and alkali volatile matter, it is easy to intensify the corrosion of cast zirconium corundum bricks.
The corrosion phenomenon of the fused-cast zirconium corundum bricks in the upper structure of the glass furnace is mainly due to the seepage of the glass phase and the erosion from the flying materials of the glass batch, alkali and boron volatiles. Although the mechanisms of the above two corrosion effects are different, they will occur. The phenomenon of fragrance adding and overlapping and even influencing each other. When the amount of glass phase seepage is too large, it will cause the appearance of nodules and stones containing A1203 and ZrO2 in the glass, forming glass defects and directly affecting the quality of the glass.
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