Brief Introduction
Magnesium aluminum spinel in magnesia alumina spinel refractoryh bricks is a generic name for minerals with the same crystalline structure. Generally, mg-aluminum spinel refractory refers to the general structure of MgAl2O4 or MgO·Al2O3, that is, the magnesium aluminum spinel is prepared from high-purity materials, has good corrosion resistance, thermal shock stability. Magnesium aluminum spinel refractory bricks have a few anti-flaking properties. Magnesium aluminate spinel firebrick is the finest advanced refractory material.
The amount of magnesium aluminum spinel bricks in the production of magnesium-aluminum spinel bricks is not as high as possible. As the amount of spinel increases, the thermal shock resistance is better, but the strength (especially the flexural strength) is caused by the mismatch expansion. ), with Al2O3 as the standard, the Al2O3 in the product should not be greater than 15%~20%, preferably 10%~18%. 
Technical Datas
| Item | Mg0 (%) |
Al2o3 (%) |
Sio2 (%) |
Bulk Density (g/cm3) |
Apparent Density (%) |
Cold Crushing Strength(Mpa) |
Refractoriness under Load of 0.2 Mpa(℃) |
ThermalShock Stability (1000℃,water,quencing,cycle) |
| 85A | 85 | 9 | 1 | 18 | 2.95 | 45 | 1700 | 100 |
| 85B | 82 | 9 | 2 | 18 | 2.9 | 40 | 1700 | 80 |
| 85C | 80 | 9 | 3 | 19 | 2.85 | 40 | 1650 | 70 |
| 93A | 93 | 5 | 1 | 18 | 2.95 | 45 | 1700 | 80 |
| 90B | 90 | 5 | 2 | 18 | 2.9 | 40 | 1700 | 70 |
Application
Magnesia-alumina spinel is used in cement rotary kiln, which not only avoids chrome pollution, but also has good resistance to spalling and Magnesium alumium spine firebricks is used to make ladle castable , greatly improve the erosion resistance of the steel lining. Magnesium alumium spinel is widely used in steelmaking refractories. The preparation of high quality pre-synthesized spinel provides new raw materials for the production of amorphous and shaped high-purity refractories.
