Mullite refractory castable is an unshaped refractory material composed of porous mullite aggregate, binder, and various additives. Mullite is a high-quality refractory raw material, and this type of mineral is relatively rare. The specific ingredient ratio can be adjusted according to the actual situation of the boiler. The refractoriness of mullite is 1790℃. Mullite castables are usually used in steelmaking, ceramics, petrochemical, and incineration industries. They can also be used as working linings in direct contact with flames, and have excellent heat insulation and heat resistance.
| Item/Grade | KRMJ-55 | KRMJ-60 | KRMJ-65 | KRMJ-70 |
|---|---|---|---|---|
| ω (Al2O3) ≥/% | 55 | 60 | 65 | 70 |
| Bulk Density ≥/ (g/cm³) | 2.3 | 2.4 | 2.5 | 2.6 |
| Flexural Strength ≥/MPa | 7 | 7 | 8 | 9 |
| Compressive Strength ≥/MPa | 40 | 50 | 60 | 70 |
| Permanent Linear Change ≤/% | ±0.5 | ±0.5 | ±0.5 | ±0.5 |
1.Low Thermal Expansion 2.Short Bake Time, No cracking 3.Environmental Friendly 4.Good Wear Resistance
1.Steel industry: ladles, ladle linings or tundishes in continuous casting systems. 2.Petroleum industry: linings of reactors, reforming tubes, flare towers, furnaces and other high-temperature equipment in petrochemical plants. 3.Glass industry: glass furnaces, regenerators, port necks and throat areas, etc. 4.Ceramic industry: used for kiln furniture, crucibles, saggers, drying racks, kiln car bases, etc.