It is used in the lining and roof of metallurgical equipment such as blast furnaces, converters, electric furnaces, and ladles.
Magnesia iron spinel refractory bricks are made of high-purity magnesia and aluminum-iron spinel as raw materials. During the use of magnesia-iron spinel bricks, a layer of highly viscous calcium-iron and calcium-iron-aluminum compounds is formed on the hot surface of the bricks, which is easy to hang in the kiln. The product has the characteristics of high compressive strength and good thermal shock resistance. The characteristics can effectively solve the problem of causing pollution to the environment by generating hexavalent chromium during the use of magnesia chrome bricks for cement kilns. Magnesia-iron spinel bricks are highly regarded for their excellent thermal stability. Its erosion resistance is better than that of high-quality magnesite chrome bricks.
| 项目/等级 | MFe-85A | MFe-85B |
|---|---|---|
| ω (MgO) ≥/% | 85 | 85 |
| ω (Al2O3)/% | 3-5 | 3-5 |
| ω (Fe2O3)/% | 4-6 | 4-6 |
| Bulk Density ≥ (g/cm³) | 2.95 | 2.90 |
| Cold Crushing Strength ≥ (MPa) | 55 | 50 |
| Refractoriness Underload ≥ (T0.6℃) | 1650 | 1600 |
| Thermal Shock Resistance ≥ (950℃ Air Quenching, Cycle) | 100 | 90 |
| Thermal Conductivity ≤ (1000℃) [W/(m·K)] | 2.6 | 2.6 |
| Thermal Expansion Coefficient (1400℃)/% | 1.6 | 1.6 |
1.Anti-Corrosion And Anti-Stripping 2.Good Thermal Shock Stability 3.Lower Thermal Conductivity 4.Good Electrical Insulation Properties
Magnesia Iron 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.