The main crystalline phase of magnesia brick is periclase, which has the typical characteristics of general alkaline refractory products, but has poor thermal shock resistance. An alkaline refractory material having a magnesium oxide content of 90% or more and a periclsite as a main phase.
An alkaline refractory product containing periclase as the main phase. The product has the characteristics of high temperature mechanical strength, good slag resistance, strong corrosion resistance and stable volume at high temperature.
Magnesia bricks have high refractoriness, good resistance to alkaline slag, high starting temperature of load softening. The sintered magnesia brick is made of brick and magnesia bricks. After being pulverized, compounded, kneaded and formed, it is fired at a high temperature of 1550 to 1600 ° C. The high-purity product has a firing temperature of 1750 ° C or higher.
Magnesia bricks mainly used in steelmaking alkaline open hearth furnace, electric furnace bottom and furnace wall, permanent lining of oxygen converter, non-ferrous metal smelting furnace, high temperature tunnel kiln, calcined magnesia brick and cement rotary kiln lining, heating furnace bottom and furnace wall, Glass kiln regenerator lattice bricks, etc.
Technical Parameter of Magnesia Bricks:
| Item | Magnesia Bricks for Sale | ||||
| Chemical Composition % | MgO ≥ | 91 | 92 | 93 | 94.5 |
| SiO2 ≤ | 4 | 3.5 | 2.5 | 2 | |
| Fe2O3 ≤ | 1.3 | – | – | 1.2 | |
| CaO ≤ | 2.5 | 2.5 | 2 | 1.8 | |
| Apparent Porosity％ ≤ | 18 | 18 | 18 | 18 | |
| Bulk Density g/cm3 ≥ | 2.86 | 2.9 | 2.95 | 2.92 | |
| Cold Crushing Strength Mpa ≥ | 60 | 60 | 50 | 60 | |
| 0.2Mpa Refractoriness Under Load T0.6 ℃ | ≥1570 | ≥1560 | ≥1620 | ≥1650 | |
| Permanent Linear Change On Reheating（%）1500℃X2h | 0～+0.4 | 0～+0.4 | 0～+0.4 | 0～+0.4 | |
| Thermal Shock Resistances 100℃ water cycles | ≥18 | ≥18 | ≥18 | ≥18 | |
