Characteristics of fused zirconium corundum bricks for glass furnaces

The pool wall bricks of the melting part of ordinary glass melting furnaces generally adopt a 250mm thick and 1350mm high overall pool wall shallow pool structure, and the pool wall bricks are made of fully oxidized tilted cast fused zirconium corundum material. Generally, 36#AZS is used in the melting area, 33#AZS is used in the clarification area, and 41#AZS is used in the corners. Under the same quality conditions, high-grade bricks have stronger corrosion resistance, but when the erosion residue is less than 50mm, high-grade bricks are prone to cracking, and some are designed as layered structures or deep pool structures. With the increase of kiln age and the use of lower-layer insulation and bubbling, the erosion of the lower pool wall is large and difficult to inspect. Some manufacturers have very thin lower pool walls when releasing water, so the quality of the lower pool walls should also be taken seriously. In order to gradually extend the life of domestic glass melting furnaces, the production technology of fused zirconium corundum bricks has been improved, and it is also crucial to make good use of pool wall bricks.

Characteristics of fused zirconium corundum bricks

There are many domestic companies producing fused refractory materials for glass furnaces, and the product quality level and price vary greatly. Many domestic manufacturers have a lot of room for improvement in appearance quality, component design, casting process and dimensional accuracy. The quality of bricks directly affects the life of the pool wall, especially the crystal phase structure, glass phase content and processing accuracy of bricks. Due to the dense structure and low porosity of fused refractory materials, the Young's modulus is extremely high below 800℃, the brittleness is very large, the cold compressive strength is very large, greater than 350MPa, but the tensile strength is only about 20MPa. When subjected to thermal shock and uneven heating, the tensile stress caused by the temperature difference is too large and the volume changes too fast, there is no pores to buffer, and it is very easy to burst.