Description of Corundum Mullite Castable
Corundum-mullite castables are refractory products made of high-quality corundum and mullite as core materials. They have the characteristics of high temperature resistance, high mechanical strength, and good thermal shock resistance. They are suitable for high-temperature industrial occasions with high requirements.
Kerui Corundum Mullite Castable Technical Data Sheet
| Item | KRGM-1 | KRGM-2 | KRGM-3 | |
|---|---|---|---|---|
| Al2O3 ≥ | 70 | 75 | 85 | |
| SiO2 ≤ | 25 | 17 | 13 | |
| Fe2O3 ≤ | 1 | 1 | 1 | |
| Bulk Density g/cm3 ≥ | 2.7 | 2.8 | 2.9 | |
| 0.2MPa Refractoriness Under Load ℃ ≥ | 1450 | 1480 | 1500 | |
| Thermal Shock Resistance, Times, (900℃, water-cooling) ≥ | 25 | 25 | 25 | |
| Maximum Service Temperature ℃ | 1550 | 1550 | 1600 | |
| Linear Dimensional Change % ≤ | -0.3 | -0.2 | -0.2 | |
| Cold Crushing Strength Mpa ≥ | 110℃*24h | 100 | 110 | 120 |
| 1100℃*3h | 100 | 110 | 120 | |
| 1400℃*3h | 115 | 120 | 125 | |
| MOR ≥ | 110℃*24h | 15 | 15 | 15 |
| 1100℃*3h | 16 | 17 | 18 | |
| 1400℃*3h | 17 | 18 | 19 | |
Advantages of Corundum Mullite Castable
1.High Temperature Resistance: Can endure extreme heat without deformation. 2.Excellent Mechanical Strength: Resist mechanical stress well. 3.Good Thermal Shock Resistance: Withstand rapid temperature changes. 4.Low Thermal Expansion: Minimize dimensional changes during heating.
Construction Methods of Corundum Refractory Castable
Surface Treatment
Make sure the surface of the construction is clean, dry, smooth, and free from other pollutants
Mixing Castables
Mix multiple bags of castables according to the materials needed, and add a certain amount of water to adjust the humidity to meet the humidity requirements of construction
Stirring
Add the mixed castable and adhesive into the mixer, add water, and mix until the color is uniform, and the lumps can be caught by hand without leakage (completed within 30 minutes)
Vibration
The castable should also be poured with a plug-in vibrator or a flat vibrator, and the layer pouring height should not exceed 400mm. Castables applied by vibrating can help eliminate porosity and improve the compactness and strength of the lining.
Curing
The completed construction body should be naturally cured in a dry environment for 5-7 days at a temperature of 5-35℃. Avoid construction body vibration during maintenance.
Application of Corundum Refractory Castables
Corundum mullite castables are applied in steel – making furnaces to resist molten steel and slag corrosion. In glass – melting kilns, they endure high – temperature glass – making processes. They’re also used in cement rotary kilns to maintain structural stability under high – temperature and mechanical stress.
