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Brief introduction of high alumina brick
High alumina bricks for steelmaking electric furnace roof are made of selected bauxite clinker as the main raw material, formed by high pressure and sintered at high temperature. The main mineral composition is corundum and mullite phase, which has excellent high temperature mechanical properties and chemical erosion resistance. Especially for non-fired products, the shape size is more precise and the thermal shock stability is more excellent.
Features of high alumina brick
The refractoriness of high alumina brick is higher than that of clay brick and semi-silica brick, reaching 1750~1790℃, which is a senior refractory material.
Because of the high Al2O3 in high alumina products, less miscellaneous mass, the formation of fusible glass body less, so the load softening temperature is higher than clay bricks, but because the mullite crystallization has not formed a mesh organization, so the load softening temperature is still not as high as silica bricks.
High alumina brick in Al2O3 more, close to neutral refractory, can resist the erosion of acidic slag and alkaline slag, because it contains SiO2, so the ability to resist alkaline slag than the ability to resist acidic slag is weaker.
Parameters of high alumina brick
| 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 |