Product Description of Neutral Refractory Materials Grade I High Alumina Bricks For Cement Rotary Kilns
Grade I High Alumina Bricks are neutral refractory materials with an alumina content of no less than 75%. They are made from bauxite or other raw materials with high alumina content, shaped, and calcined. These bricks exhibit excellent thermal stability, a refractoriness exceeding 1770°C, and good slag resistance.
The production process for high alumina bricks is similar to that of multi-clinker clay bricks, with the key difference being a higher proportion of clinker in the mixture, reaching up to 90–95%. Before crushing, the clinker must be carefully graded, sorted, and screened to remove iron. The firing temperature is also higher; for Grade I and II high alumina bricks fired in a tunnel kiln, the temperature typically ranges from 1500–1600°C.
To enhance product quality, high alumina clinker is meticulously graded and stored before crushing. A combination of bauxite clinker and bonding clay is finely ground together during production.
Performance Characteristics of Grade I High Alumina Bricks:
- Excellent high-temperature volume stability.
- Superior thermal shock resistance.
- High wear resistance.
- Strong resistance to chemical corrosion.
Main Applications of Grade I High Alumina Bricks:
These high alumina refractory bricks are widely used in transition zones and preheaters of cement rotary kilns, as well as in other thermal equipment requiring exceptional thermal shock resistance.
| Index | Grade I High Alumina Brick |
| Model | LZ-75 |
| Al2O3 (%) ≥ | 75 |
| Fe2O3 (%) ≤ | 2.5 |
| Bulk Density (g/cm³) ≥ | 2.6 |
| Cold Crushing Strength (MPa) ≥ | 70 |
| Refractoriness Under Load (°C) | 1510 |
| Refractoriness (°C) | 1790 |
| Apparent Porosity (%) ≤ | 22 |
| Linear Change Rate (%) | -0.3 |
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Neutral Refractory Materials Grade I High Alumina Bricks For Cement Rotary Kilns Images
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