What Is Refractory Castable?

Refractory castable is a material used for high-temperature industrial kiln masonry. It is in powder form under normal conditions. When used, it must be stirred with pure water until it becomes dense for pouring. It can resist high-temperature erosion. There are hundreds of common refractory castables, such as high-aluminum castables, non-stick aluminum castables, corundum castables, silicon carbide castables, etc. Different refractory castables have different components, and there are also differences in physical and chemical indicators. Therefore, when choosing, it is necessary to choose according to the actual environmental characteristics.

Refractory castables have the characteristics of high-temperature resistance, thermal shock resistance, creep resistance, etc., and can usually withstand high temperatures above 1450℃. Some refractory castables with specific proportions, can not only withstand high temperatures but also have wear resistance and very good wear resistance, such as high-strength wear-resistant refractory castables. To resist the erosion of the furnace wall by acidic and alkaline media, refractory castables need to be alkali-resistant and acid-resistant, such as acid-resistant castables and alkali-resistant castables. Some highly active media, such as molten aluminum, can corrode the furnace wall, so specific refractory castables are needed, such as non-stick aluminum castables. Not only that, but there are also magnesium castables that can withstand high temperatures above 1800 degrees Celsius, anti-scaling castables that can reduce the crusting of the furnace wall, and lightweight insulation castables that can keep the kiln warm.

The types of refractory castables are generally developed and produced according to actual use, so there are many types. Generally, when we choose, we choose according to the use temperature, use environment, medium characteristics, etc. of the kiln. Generally, more than one refractory castable is used for the construction of a kiln. The refractory layer of the kiln generally chooses high-temperature resistant refractory castables, the insulation layer generally chooses lightweight insulation castables, and the furnace bottom and furnace wall will choose different refractory castables. In general, refractory castables play an important role in high-temperature industrial fields such as metal smelting, glass manufacturing, and ceramic production. The use of refractory castables can not only protect the kiln but also extend the service life of the kiln and ensure the stability of production.