Sands & Clays
Sillimanite
Sillimanite is a leading raw material for high-alumina refractories and 55–60 % alumina bricks, and an important input to the china and ceramic industries. It converts to mullite and a glassy phase at around 1250 °C and has a melting point of approximately 1850 °C.
Typical Analysis
| Composition | Value (%) |
|---|---|
| Al₂O₃ | 57.5 |
| SiO₂ | 37.3 |
| Fe₂O₃ | 0.59 |
| ZrO₂ | 0.40 |
| TiO₂ | 0.38 |
Key Properties
| Melting point | ≈ 1850 °C |
|---|---|
| Grain size | Coarse and fine (200–325 mesh) |
