As various high-temperature kilns and thermal equipment are being used at higher temperatures and for longer service life, refractory castables have become widely used as a type of unshaped refractory material during production and use.
There are many types of refractory castables. The advantages of using refractory castables compared with refractory bricks are simple process, energy saving, low cost and easy mechanized construction. It has been widely used in various types of thermal equipment such as cement, steel, glass and electric power.
Choosing the appropriate refractory castables is therefore crucial
- Forthe castables used for kiln mouth, the Al2O3 content is 50% to 70%, the strength is moderate, and the drying and compressive strength (1100℃) is about 40MPa and 70MPa respectively.
- For the front kiln mouth refractory lining, which suffers frequently from rapid cooling and heating, it can withstand cement clinker wear and alkali corrosion at temperatures ranging from 800℃ to 1250℃. The choice of the main material for refractory castables must be determined according to their usage conditions, so as to achieve both low cost and good usability. Unshaped refractory materials are typical in-situ reaction refractory materials; therefore, it is essential to choose additives that ensure proper construction performance, baking performance, and in-situ reaction at high temperatures to obtain excellent material properties.
Refractory castables have a wide range of applications in kilns, providing convenience and efficiency to kiln use. They can be effectively used to improve kiln performance and protect it. Therefore, utilizing their properties can expand their applications in kilns and bring benefits when properly utilized.