The status quo of silica bricks for glass kilns!

Silicon bricks are used in glass kilns. The types, sizes and structures of the kilns that produce glass are different, and the performance and use requirements of refractories are also different. The stereotyped refractories used in the glass industry, especially float glass kilns, mainly include three categories: melting and casting refractories, silica bricks and magnesia refractories. Silica bricks are traditional products of refractories for glass kilns, and refer to refractory products with a SiO2 content of ≥ 93%. Silica bricks are made from silica with a SiO2 content of ≥ 96% as raw material, adding mineralizers and binders, and are prepared through mixing, forming, drying, and firing. The higher the content of SiO2 in the raw material of silica, the higher the refractory degree of the product. Silica brick is an acidic refractory material with strong acid corrosion resistance. Silica brick has the characteristics of higher load softening temperature, lower density and cheap price. It is widely used in the carbonization chamber, combustion chamber and partition wall of coke oven, glass pool kiln and kiln roof, pool wall, high temperature load-bearing part of hot blast furnace, carbon roasting furnace and other thermal equipment. Silica bricks for glass pool kiln are mainly used in the large body of the melting kiln and part of the flame space. The quality of silicon bricks is related to the normal operation and life of the melting kiln. Silica bricks have experienced three generations of development since their inception. The first generation of silicon bricks is the traditional ordinary silicon brick, and the second generation is the high-grade silicon brick. Compared with ordinary silicon bricks, it has the characteristics of "three highs and three lows". "Three highs" refers to high purity (SiO2 content > 96%), high load softening temperature (> 1685 ℃), high-scale quartz and square quartz content (high-scale quartz and square quartz content > 90%); "three lows" refers to low impurity content (Al2O3 + 2R2O ≤ 0.5%), low true density (≤ 2.34g/cm3), low residual quartz (≤ 3%). The third generation is an improved brick of the second generation. The content of CaO is reduced from the original 2% to 3% to less than 1%, the content of alkali metal oxides is further reduced than 0.5%, the content of FeO is less than 0.2%, and the apparent porosity is reduced from the second generation. The 20% to 22% dropped to 16% to 18%. The production technology of silicon bricks in my country is relatively mature, but the quality of products varies. With the development and promotion of full-oxygen combustion technology in glass kilns, the silicon bricks used tend to require lower apparent porosity and lower melting index. The mouse hole generated when used in the furnace requires the prepared material to have fewer structural defects and dense bonding of fire mud between the expansion joints.