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Product introduction of white corundum fire brick
White corundum fire brick refers to refractory brick products with Al2O3 content greater than 90% and refractory products with corundum as the main crystalline phase. The raw material of white corundum fire brick is a kind of solid solution synthesized by alumina and chromium oxide according to a certain proportion through high temperature melting. Refractory brick is made by special refractories production technology.
Advantages of white corundum fire brick
White corundum brick has good chemical stability and strong resistance to acidic or alkaline slag, metal and glass liquid. It can receive good use effect in oxidizing atmosphere and reducing atmosphere at high temperature.
Application of white corundum fire brick
- Ironmaking blast furnace
- Blast furnace hot blast stove
- Outside refining furnace
- Glass furnace
- Petrochemical industry furnace
White corundum bricks size index:
| ltem | Ultra Purity Corundum Brick | 99 Corundum Brick | 90 Corundum Brick | Corundum-Mullite Brick |
| Al2O3% | ≥99.3 | ≥98.5 | ≥90 | ≥80 |
| SiO2% | ≤0.15 | ≤0.3 | ≤8.5 | ≤18.5 |
| Fe2O3% | ≤0.1 | ≤0.2 | ≤0.2 | ≤0.3 |
| Bulk density, g/cm3 | ≥3.25 | ≥3.25 | ≥3.1 | ≥2.9 |
| Apparent porosity, % | ≤18 | ≤18 | ≤18 | ≤18 |
| Cold crushing strength, MPa | ≥100 | ≥100 | ≥120 | ≥120 |
| Refractoriness under load, ℃(0.2MPa,0.6%) | ≥1700 | ≥1700 | ≥1700 | ≥1700 |
| Reheating linear change rate, %(1600℃ x 8h) | -0.2 | -0.2 | 0.2 | 0.2 |
| Thermal expansion coefficient, x 10-6 (Room temp. to 1300'C) | 8.1 | 8.1 | 8.1 | 7.6 |
Fused zirconium corundum brick index:
| ltem | AZS-33 | AZS-33 | AZS-36 | AZS-36 | AZS-41 | AZS-41 |
| Y | H | Y | H | Y | H | |
| Al2O3≥ | 90 | 90 | 90 | 90 | 90 | 90 |
| ZrO2≥ | 32.0 | 32.0 | 35.0 | 35.0 | 40.0 | 40.0 |
| SiO2≤ | 16.0 | 17.0 | 13.5 | 14.5 | 13.0 | 14.0 |
| Na2O≤ | 1.5 | 1.5 | 1.4 | 1.4 | 1.3 | 1.3 |
| Fe2O3+TiO2+CaO+MgO +Na2O+K2O+B2O3≤ | 2.5 | 3.0 | 2.5 | 3.0 | 2.5 | 3.0 |
| BD, PT.QX ≥ | 3.40 | 3.30 | 3.45 | 3.40 | 3.55 | 3.50 |
| BD, MS≤ | 3.50 | 3.45 | 3.60 | 3.55 | 3.70 | 3.65 |
| BD, WS≤ | 3.60 | 3.55 | 3.70 | 3.65 | 3.80 | 3.75 |
Note: PT - ordinary pouring products; QX - inclined pouring products; MS - dense pouring products; Ws - keyless casting.