1. Types of refractory materials for high-temperature kilns 1. Siliceous refractory material Siliceous refractory material is a refractory material with SiO2 as the main component. It has extremely high fire resistance and high temperature stability. Silica refractory materials have excellent thermal shock resistance, wear resistance and chemical stability, so they are widely used in thermal insulation layers, linings and load-bearing structures in high-temperature kilns.

Alkali return is actually a problem of hoarfrost on the surface of high-alumina refractory bricks. During the firing process, due to factors such as technology and raw materials, the brick body will produce certain pores, so there will be a certain water absorption rate. Soluble salts, along with moisture, transfer to the surface of the brick, forming what we call hoarfrost.

1. Anti-shedding high alumina bricks High alumina refractory bricks are an aluminum silicate refractory material with an alumina content of more than 48%. It is formed and calcined from alumina or other raw materials with high alumina content. It has high thermal stability and refractoriness above 1770℃. Good slag resistance. Mainly used for lining blast furnaces, hot blast furnaces, electric furnace roofs, blast furnaces, reverberatory furnaces, and rotary kilns. In the cement industry, it is often used in transition zones, differentiation zones, and kiln door covers of small cement kilns to resist wear and tear.

Refractory castables are attracting more and more attention from customers, but they are often affected by the ambient temperature during use and undergo drastic changes. The thermal shock resistance of the castables reflects its value. Its thermal shock resistance is an important indicator for measuring the breakage resistance of the castables. It is the ability to counteract the loss caused by rapid changes in temperature during the use of the castables.