Magnesia bricks, magnesia-alumina spinel bricks and magnesiz-zircon bricks characterized by their excellent resistance to alkaline vapor and slag, are used for regenerator of glass furnace, cement kiln, metallurgical furnaces for nonferrous metals, steel making electric furnace, flat furnace, converter and holding furnace in the parts contacted with alkaline materials.
Item | Magnesia bricks | Middle Grade Magnesia Brick | High Purity Magnesia Brick | Electric fused Magnesia Brick |
MZ-89 | MZ-91 | MZ-95 | MZ-96 | MZ-97 | MZ-98 | DMZ-98 |
MgO %min | 89 | 91 | 94.5 | 95.5 | 96.5 | 97.5 | 97.5 |
CaO %max | 3 | 3 | 2.5 | 2 | 1.5 | 1.0 | 1.0 |
Apparent porosity % max | 20 | 18 | 18 | 18 | 18 | 18 | 18 |
Cold crushing strength Mpa min | 49 | 58.8 | 60 | 60 | 60 | 60 | 40 |
Refractoriness under load (0.2Mpa) min | 1540 | 1550 | 1620 | 1650 | 1680 | 1700 | 1700 |
Permanent linear change on reheating % | -0.6 | -0.5 | - | - | - | - | - |