Sillimanite brick is made of sillimanite kind mineral, adopt high temperature firing or mud casting to make refractory brick with good character. After high-temperature calcination, the sillimanite transferred to mullite and free silicon dioxide. Generallym it adopts high temperature firing and mud casting for production.
Introduction of Silllimanite Brick
Sillimanite brick is a kind of high grade refractory mineral, it has the characteristics of low thermal expansion rate, resistance to metallurgical slag and various glass liquid, good wear resistance of high temperature. Its physical and chemical property is better than high alumina brick, the refractoriness is 1770～1830℃, refractory under load starting point is 1500～1650℃.The sillimanite bricks are used in throat formation of glass kiln, liner of blast furnace, furnace throat and ceramic industry kiln furniture, furnace throat. And the refractory which are mainly made of natural sillimanite also have these advantages. So, siliimanite refractory material is widely used in metallurgy, chemical industry and building materials, etc.
Application of Sillimanite Brick
- High temperature resistance and antiwear coatings.
- Sillimanite fireball
- Styrene kaolin—sillimanite insulation material
- High strength unshaped refractory, used to masony high temperature kiln fire clay
- Rare-earth compound silicon carbide material
- Composite insulation high temperature refractory coating.
- Refractory castables with high temperature self-enhacement.
Owing to the sillimanite brick has the characteristics of high temperature tolerance , resistance to glass liquid erosion, low pollution to glass liquid, which is often used in forehearths , feeder, tube drawing machine of glass industry, can remarkably increase productivity.
Physical and Chemical Index of Sillimanite Brick
| Item | Properties | ||||||
Sillimanite | Andalusite | Cordierite and mullite | Pouring sillimanite | ||||
LS-65 | L-60 | H-60 | HS-55 | SPCD-50 | SPCD-60 | CS-58 | |
AL2O3(%) | 65 | 60 | 60 | 55 | 50 | 60 | 58 |
Fe2O3(%) | 0.8 | ||||||
Refractoriness,°C | 1790 | 1790 | 1790 | 1770 | 1770 | 1790 | 1790 |
Apparent porosity % | 22 | 22 | 22 | 22 | 24 | 24 | 26 |
Cold Crushing strength MPa | 50 | 50 | 40 | 40 | 40 | 50 | 50 |
Bulk density,g/cm3 | 2.2 | 2.2 | 2.5-2.7 | 2.5-2.7 | 2.4 | 2.4 | 2.2 |
Softening temperature under load,KD°C≥ | 1550 | 1500 | 1500 | 1450 | 1450 | 1500 | 1450 |
Permanent linear change,%(°C×h) | ±0.2 | ±0.2 | ±0.2 | ±0.2 | (1000°C)≤±0.5% | (1000°C)≤±0.5% | 1400°C×2h +0.1 -0.3 |
Application | Used for temperature change severe industrial furnace and thermal lining equipment | All sorts of kiln burner brick and ceramic kiln brick | All industrial furnace | ||||
| Types Of Sillimanite Products | |
| Item | Index |
| Al2O3(%) | >60 |
| SiO2(%) | ≤37 |
| Fe2O3 | ≤1 |
| Refractoriness ℃ | >1790 |
| 0.2Mpa Refractoriness under load ℃ | 1500 |
| Reheating linear change % 1400℃x2h | 0.15 |
| -0.5 | |
| Apparent porosity % | ≤25 |
| Bulk density | 2.2-2.4 |
| Cold crushing strength Mpa | >50 |
| Sillimanite product | Forehearth brick, trough, rotating tube, spout, stirrer, punch, barrel, guard brick, burner brick, beam plate brick, etc. |
| Application | The discharging hole of glass tank furnace; Forehearth and gob feeder for glass tank furnace; The furnace lining, furnace throat for blast furnace; Kiln furniture for ceramic industry. |
