■ Feature
Sillimanite refractory brick is a refractory bricks made of sillimanite minerals. The sillimanite is calcined at high temperature and converted to mullite and free silica. Sillimanite refractory brick is generally used high temperature firing method and mud casting method. Its physical and chemical properties are better than high alumina bricks, refractoriness 1770 ~ 1830 ℃, load softening start point 1500 ~ 1650 ℃.
It mainly used for glass pool kiln flow hole forming, blast furnace lining, furnace throat and ceramic industrial kiln.
■ Technical Data
| Item | Sillimanite brick 70 | Sillimanite brick 65 | Sillimanite brick 55 |
| Al2O3% | 65 | 60 | 55 |
| SiO2 | ≤32 | ≤37 | ≤42 |
| Fe2O3% | ≤1.0 | ≤1.0 | ≤1.5 |
| TiO2% | — | — | — |
| K2O+Na2O% | — | — | — |
| Bulk Density g/cm3 | 2.5 | 2.3 | 2.3 |
| Apparent porosity % | ≤18 | ≤19 | ≤20 |
| Cold crushing strength MPa | 60 | 60 | 50 |
| Refractoriness under load 0.2MPa C | 1650 | 1600 | 1580 |
