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Product introduction of high alumina bricks
High alumina brick is a kind of refractory, and its main component is Al2O3.
A neutral refractory with alumina content of more than 48%. It is formed by shaping and calcining bauxite or other raw materials with high alumina content. High thermal stability and fire resistance above 1770 ℃. It has good slag resistance and is used for lining steel making electric furnace, glass furnace, cement rotary furnace, etc.
Features of high alumina bricks
Refractoriness
The refractoriness of high alumina bricks is higher than that of clay bricks and semi silica bricks, reaching 1750~1790 ℃, belonging to advanced refractory materials.
Load softening temperature
Because of high Al2O3 content in high alumina products, less impurities and less fusible glass, the load softening temperature is higher than that of clay bricks. However, since mullite crystals do not form reticular structure, the load softening temperature is still lower than that of silica bricks.
Slag resistance
High alumina bricks contain more Al2O3, which is close to neutral refractories and can resist the corrosion of acid slag and alkaline slag. Because it contains SiO2, the ability to resist alkaline slag is weaker than that of acid resistant slag.
Parameters of high alumina bricks
| Item/Grade | SK-36 | SK-37 | SK-38 | SK-40 |
| AL2O3% (≥) | 55 | 65 | 70 | 82 |
| Fe2O3% (≤) | 2 | 2 | 2 | 2 |
| Refractoriness(SK) | 36 | 37 | 38 | 40 |
| Refractoriness underload, 0.2MPa, °C (≥) | 1450 | 1480 | 1530 | 1600 |
| Apparent porosity (%) | 20-23 | 20-23 | 20-22 | 18-20 |
| Bulk density (g/cm³) | 2.25-2.4 | 2.3-2.5 | 2.4-2.6 | 2.5-2.7 |
| Cold crushing strength ,MPa (≥) | 45 | 50 | 60 | 70 |