- Time:Jul 25, 2023
Magnesia alumina spinel bricks and clay bricks are both types of refractory bricks used in various high-temperature applications. However, there are important differences between them:
1.Composition
Magnesia alumina spinel bricks are made primarily from magnesia (MgO) and alumina (Al2O3). They contain a high percentage of spinel, which is a mixed oxide of magnesium and aluminum. On the other hand, clay bricks are predominantly composed of clay minerals, such as kaolinite or fireclay.
2.Refractoriness
Magnesia alumina spinel bricks have excellent refractory properties, with high melting points and resistance to thermal shock. They can withstand higher temperatures compared to clay bricks, making them suitable for more demanding applications.
3.Chemical Resistance
magnesia alumina spinel bricks exhibit good chemical resistance to basic slags and alkalis. They are often used in environments where alkaline corrosion is a concern. Clay bricks, although generally chemically stable, may not have the same level of resistance to alkaline or corrosive conditions as magnesia alumina spinel bricks.
4.Thermal Conductivity
Magnesia alumina spinel bricks typically have lower thermal conductivity compared to clay bricks. This property helps reduce heat loss and enhance energy efficiency in high-temperature applications.
5.Applications
Magnesia alumina spinel bricks are commonly used in steelmaking, cement kilns, non-ferrous metal refining, and other industries that require high-temperature resistance and excellent thermal shock resistance. Clay bricks, on the other hand, find applications in less severe temperature environments, such as building construction, furnaces, and residential fireplaces.
In summary, magnesia alumina spinel bricks offer superior refractory properties, higher temperature resistance, and better chemical resistance compared to clay bricks. However, clay bricks are more cost-effective and suitable for lower temperature applications. The choice between these two types of bricks depends on the specific requirements of the application, including temperature, chemical exposure, and overall performance expectations.
Physical and chemical indicators of zhenjin magnesia alumina spinel brick
| Brand | ZJMA-6 | ZJMA-7 | ZJMA -8 | |
| Chemical Composition wt% |
MgO | ≥85 | ≥86 | ≥86 |
| Fe₂O₃ | ≤0.8 | ≤0.7 | ≤0.7 | |
| Al₂O₃ | 11-13 | 10-12 | 10-12 | |
| SiO₂ | ≤0.7 | ≤0.5 | ≤0.35 | |
| CaO | ≤1.3 | ≤1.1 | ≤0.95 | |
| Bulk Density, g/cm³ | ≥2.95 | ≥2.97 | ≥3.0 | |
| Apparent Porosity, % | ≤16 | ≤16 | ≤16 | |
| Cold Crushing Strength MPa |
≥65 | ≥65 | ≥65 | |
| Refractoriness under Load, ℃ (0.2MPa, t0.6) |
≥1700 | ≥1700 | ≥1700 | |
| Thermal Shock Test, Cycle (1100℃, water quenching) |
≥10 | ≥12 | ≥12 | |
