It is used in the lining and roof of metallurgical equipment such as blast furnaces, converters, electric furnaces, and ladles.
Magnesia spinel bricks containing a certain proportion of alumina are also called magnesia alumina spinel bricks, with a structure of MgAl2O4 or MgO·Al2O3. magnesia alumina spinel brick not only has high hardness, low thermal expansion coefficient, and high density, but also has the advantages of quenching resistance and rapid heating, and has good corrosion resistance to solvents such as iron oxide and alkali slag.
Magnesia Alumina Spinel Brick
| Item | Index | |
|---|---|---|
| ω (MgO)/% | μ0 ≥ | 80 |
| ω (Al2O3)/% | μ0 ≥ | 10 |
| Apparent Porosity/% | μ0 ≤ | 17 |
| ở | 0.8 | |
| Bulk Density (g/cm³) | μ0 ≥ | 2.90 |
| ở | 0.03 | |
| Cold Crushing Strength/MPa | L ≥ | 50 |
| ở | 5 | |
| Permanent Linear Change (1500℃*2h)/% | L~U | 0~+0.3 |
| ở | 0.05 | |
| High-temperature Bending Strength (1350℃*0.5h)/MPa | μ0 ≥ | 3.5 |
| ở | 0.6 | |
| Thermal Shock Resistances (1100℃, Water Cooling)/Cycle | μ0 ≥ | 12 |
| ở | 2 | |
1.Anti-Corrosion And Anti-Stripping 2.Good Thermal Shock Stability 3.Lower Thermal Conductivity 4.Good Electrical Insulation Properties
Magnesia spinel bricks are extensively used in the steel industry. They line the linings of converters, protecting against molten steel and slag corrosion. In electric arc furnaces, they endure arc impacts and temperature fluctuations. Also, they’re applied in ladles, safeguarding against steel – water erosion for stable operations.