Description
Magnesia-alumina-chrome composite spinel bricks are made from magnesia, synthetic spinel and a small amount of ferrochrome ore as the main raw materials, formed under high pressure and fired at medium to high temperatures. It is an upgraded product of pure magnesia bricks and magnesia-alumina bricks. Compared to the same base magnesia-alumina bricks, it shows significant improvements in performance, including higher load softening temperature and better thermal shock resistance. These bricks are primarily used in high-temperature industrial kilns, especially at the kiln roof, areas exposed to intense thermal shock and regions subjected to prolonged high-temperature load.
Specification
| Item | Grade | |
| MAC—80 | MAC—85 | |
| ω(MgO)/%≥ | 80 | 85 |
| ω(Al₂O₃)/% | 6～10 | 5～8 |
| ω(Cr₂O₃)/% | 4~6 | 3~5 |
| Apparent Porosity/%≤ | 17 | 17 |
| Bulk Density/(g/cm³)≥ | 3.0 | 2.95 |
| Cold Crushing Strength/MPa≥ | 45 | 45 |
| Refractoriness Under Load / 0.2 MPa T0.6/℃≥ | 1700 | 1700 |
| Thermal Shock Resistance(1000℃~Cold)≥ | 5 | 8 |
Applications
Used in the roof and lining of high-temperature furnaces in the steel industry;
Used in the volatile kilns of Zinc and the roof of non-ferrous metal smelting furnaces;
Used in the regenerator of glass kilns.
