Corundum mullite castable is one of the high-quality amorphous refractories produced by Ruiwo. It has stable high-temperature performance, good wear and erosion resistance. It is commonly used for pouring the lining of high-temperature furnace. It is a common refractory castable.
When purchasing corundum mullite castables, you need to understand the physical and chemical indexes of corundum mullite castables. The common physical and chemical indexes of mullite castables are as follows:
Corundum mullite castable: Al2O3, ≥ 75%; SiO2，≥20%； Bulk density, ≥ 2.75g/cm3; Compressive strength, ≥ 80-90mpa (110 ℃) × 24h），≥100（1100℃ × 3h）； Linear change rate, – 0.1 ~ – 0.3% (1100 ℃) × 3h），-0.5%（1500℃ × 3h）
The important physical and chemical indexes of amorphous refractories include the chemical composition and physical indexes of castables. The chemical composition is the chemical composition of refractory raw materials, such as the proportion of alumina and silicon dioxide in corundum mullite castables; The physical indexes include bulk density, compressive strength and linear change rate. These three indexes are used to check whether the refractory castable is suitable for the pouring of blast furnace lining, whether it can adapt to the blast furnace environment, and whether peeling and falling off will occur in the high-temperature environment.
Corundum mullite castable is made by using high-quality brown corundum, white corundum, andalusite, mullite and high-quality bauxite as main raw materials, adding ultra-fine powder refractory powder and mixing in a scientific formula proportion. Corundum mullite castables for different kilns are adjusted according to specific conditions to meet the physical and chemical indexes of corundum mullite castable required by customers.