Chrome corundum brick is a corundum refractory product containing Cr2O3. At high temperature, Cr2O3 forms a continuous solid solution with Al2O3, so the high temperature performance of chrome corundum products is better than that of pure corundum products. The chrome corundum brick used in the petrochemical industrial gasifier should be low in silicon, low in iron, low in alkali, high in purity, and also have high density and strength. The application of more chrome corundum products, Cr2O3 content is mostly in the range of 9% to 15%. The main mineral composition is α-Al2O3-Cr2O3 solid solution. The secondary mineral consists of a small amount of composite spinel (or no composite spinel) and a refractory brick with a chromium oxide content of 1% to 30%. There are two kinds of fused cast chrome corundum bricks and sintered chrome corundum bricks. In general, chrome corundum bricks refer to sintered chrome corundum bricks.
The application of chrome corundum brick is wider. The product is widely used in zinc smelting electric furnace and volatile kiln. The chrome corundum brick has excellent vibration stability and high temperature creep performance, in line with the requirements of the national circular economy.
Technical Parameter of Chrome Corundum Bricks:
| Item | Chrome Corundum Brick | |
| Chemical composition | Al2O3 | ≥92 |
| SiO2 | ≤1.0 | |
| Fe2O3 | ≤0.3 | |
| CaO | ≤1.2 | |
| Na2O | – | |
| ZrO2 | ≥3 | |
| Cr2O3 | ≥3 | |
| Apparent Porosity (%) | ≤15 | |
| Bulk Density（g/cm3） | ≥3.25 | |
| Compressive Strength（Mpa） | ≥180 | |
| High Temperature Crushing Strength（1250℃ Mpa) | ≥9.5 | |
| Refractoriness（℃） | ≥1900 | |
| Load Softening Temperature（0.2Mpa T0.6 ℃） | ≥1680 | |
| Reburning Line Change Rate % （1500℃×2h) | ≤±1.2 | |
