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Magnesia brick is an alkaline refractory material with magnesia content above 90% and periclase as the main crystal phase. Magnesia brick is a refractory brick made of fused magnesia and sintered magnesia at high temperature. Magnesia bricks have high refractoriness, good resistance to alkaline slag, high load softening temperature, but poor thermal shock resistance.
Magnesia bricks are mainly used for steel-making alkaline open hearth, electric furnace bottom and wall, oxygen converter lining, non-ferrous metal smelting furnace, high temperature tunnel kiln, short magnesia brick and cement rotary kiln lining, furnace bottom and wall of heating furnace, glass Kiln regenerator, etc.
| Item | MZ-92 | MZ-95 | DMZ-97 | DMZ-98 |
| MgO % ≥ | 92 | 95 | 96.8 | 97.5 |
| CaO % ≤ | 2.5 | 2.0 | 1.2 | 1.2 |
| SiO2 % ≤ | 3 | 2.5 | 1.5 | 1.0 |
| Bulk Density≥ g/cm3 | 2.92 | 2.95 | 3.10 | 3.15 |
| A.P. % ≤ | 18 | 18 | 16 | 15 |
| C.C.S (Mpa) ≥ | 55 | 60 | 70 | 80 |
| 0.2mpa Refractoriness under load T0.6 ≥ °C | 1550 | 1600 | 1700 | 1700 |
