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Brief introduction of magnesia brick
The raw material of magnesia brick is mainly magnesite, and its basic component is MgCO3, which becomes sintered magnesia after high temperature calcination and then crushing to a certain particle size. Magnesia is widely used as furnace material, ramming material, containing less impurities of magnesia (ω (CaO) <2.5%, ω (SiO2) <3.5%), as the raw material for the manufacture of magnesia brick. Magnesium brick belongs to alkaline refractory material, has strong resistance to alkaline slag, but can not resist acid slag erosion, at 1600℃, and silicon brick, clay brick and even high aluminum brick contact can react.
Features of magnesia brick:
Magnesia brick has high refractoriness, good resistance to alkaline slag, high initial temperature of softening under load, but poor thermal shock resistance. The sintered magnesia brick is made of magnesia brick as raw material. After grinding, batching, mixing and forming, the sintered magnesia brick is fired at the high temperature of 1550 ~ 1600℃. The sintering temperature of high purity products is above 1750℃. Unpoured magnesia brick is made by mixing, forming and drying magnesia with appropriate chemical binder.
More relevant refractory products: Cement CA50
Parameters of magnesia brick:
| Item | MZ-91 | MZ-92 | MZ-93 | MZ-94 | MZ-97 |
| MgO, % ≥ | 91 | 92 | 93 | 94.5 | 97 |
| SiO2, % ≤ | 4 | 3.5 | 2.5 | 2 | 2 |
| Fe2O3, % ≤ | 1.3 | – | – | 1.2 | 1.2 |
| CaO, % ≤ | 2.5 | 2.5 | 2 | 1.8 | 1.8 |
| Apparent Porosity, ％ ≤ | 18 | 18 | 18 | 18 | 18 |
| Bulk Density, g/cm3 ≥ | 2.86 | 2.9 | 2.95 | 2.92 | 2.95 |
| Cold Crushing Strength Mpa, ≥ | 60 | 60 | 50 | 60 | 60 |
| 0.2Mpa Refractoriness Under Load T0.6 ℃ | ≥1570 | ≥1560 | ≥1620 | ≥1650 | ≥1700 |
| Thermal Shock Resistances 100 ℃ water cycles | ≥18 | ≥18 | ≥18 | ≥18 | ≥18 |