
Magnesite chrome brick
Other name: Magnesia chrome brick
Model Number: HCR 8A,HCR 9A,HCR 12A,HCR 4,HCR 6,HCR Ge
Certification: ISO9001-14001
Minimum Order Quantity: 5 MT
Magnesite chrome brick
Introduction:
Magnesite-chrome brick is composed of MgO and Cr2O3 as the main components, and periclase and spinel are the main minerals. Its main raw materials are sintered magnesite and chromite. The purity of the magnesite raw material should be as high as possible. The chemical composition of the chromite ore requires Cr2O3 30-45% and CaO less than 1.0-1.5%. The production process of firing magnesite-chrome bricks is similar to that of magnesite bricks. In order to eliminate the loose effect caused by the expansion of the brick during the firing process due to the reaction of MgO and Cr2O3, Al2O3 or iron oxides to form spinel, the synthetic common sintering material can also be used to form the magnesite chrome brick.Both the properties resistant to slag and high temperature strength are better than other magnesite chrome bricks.
Advantages:
High refractoriness,excellent high temperature strength, strong resistance to alkaline slag, excellent thermal stability, and certain adaptability to acid slag
Application:
Metallurgical industry, such as open-hearth furnace roof, electric furnace roof, refining furnace and various non-ferrous metal smelting furnaces, glass industry, cement industry
Magnesite chrome brick physical and chemical
| Item | HCR 8A | HCR 12A | HCR 9A | HCR 6 | HCR 4 | HCR Ge |
| MgO min% | 82 | 75 | 70 | 75 | 80 | 80 |
| Cr₂O₃ min% | 8 | 12 | 9 | 6 | 4 | 3~5 |
| SiO₂ MAX% | 1.5 | 1.5 | 2.8 | 2.8 | 2.5 | 1.5 |
| Apparent porosity MAX % | 17 | 17 | 19 | 18 | 18 | 18 |
| Bulk Density g/cm³ | 3 | 3.05 | 3 | 2.95 | 2.93 | 3 |
| Cold Crushing Strength Mpa ≥ | 45 | 45 | 40 | 40 | 40 | 45 |
| Refractoriness under load of 0.2Mpa(℃) | 1700 | 1700 | 1600 | 1600 | 1600 | 1650 |
| Thermal shock stability (950℃ air cold)> | 80 | 80 | 60 | 60 | 60 | 80 |
| Thermal Conductivity (1000℃)W/m.k ≤ | 2.8 | 2.8 | 2.8 | 2.9 | - | - |
| Therm.Exp (1400℃) % | 1.5 | 1.5 | 1.5 | 1.4 | - | - |