Corundum refractory castable is an unshaped refractory material formed by mixing corundum and super bauxite clinker as aggregate and powder, plus some pure calcium aluminate cement, as well as binders and additives. The alumina content of the corundum castable is more than 90%, which ensures the existence of a large amount of corundum as the main crystal phase. It has the advantages of high strength, stable volume, and corrosion resistance. Corundum castables are usually constructed by the pouring method, which can be poured into an integral lining or spliced on site.
| Item/Grade | GJ80 | GJ90 | GJ95 |
|---|---|---|---|
| ω (Al2O3) ≥/% | 80 | 90 | 95 |
| Bulk Density ≥/ (g/cm³) | 2.7 | 2.8 | 3.2 |
| Flexural Strength ≥/MPa | 9 | 10 | 11 |
| Compressive Strength ≥/MPa | 60 | 60 | 60 |
| Permanent Linear Change ≤/% | ±0.5 | ±0.5 | ±0.5 |
1.Corrosion Resistance 2.High-Pressure Strength 3.Good Volume Stability 4.Excellent Mechanical Strength
Corundum castables can be used in a variety of furnace linings: 1.Steelmaking furnaces: electric arc furnaces, ladle linings 2.Glass furnaces: linings of glass furnace walls, cement kiln roofs and floors 3.Ladles and crucibles: construction and repair of ladles and crucibles in industries involving metal melting and pouring operations 4.Pipes and chimneys: linings of flue gas ducts and chimneys in power plants and industrial facilities 5.Burner throats: burner throats and preheater systems