Product Description
Kyanite is a high-alumina silicate mineral (Al₂SiO₅) characterized by excellent refractory properties and high-temperature volume stability. The material appears as a light blue to grey powder with outstanding thermal performance.
When heated above 1350 °C, kyanite transforms into mullite and silica, resulting in a volume expansion that enhances the density and strength of refractory products. This unique property makes it an ideal raw material for advanced refractory applications.
Main Applications
- Raw material for refractory bricks and castables
- Foundry molds and kiln furniture
- Additive for ceramics and spark plugs
- Ingredient for mullite formation in high-temperature products
Technical Specifications
Chemical Composition (by weight %)
| Component | Content (%) |
|---|---|
| Al₂O₃ | 50.98 |
| SiO₂ | 38.21 |
| Fe₂O₃ | 2.55 |
| MgO | 2.29 |
| TiO₂ | 2.02 |
| Zr(Hf)O₂ | 2.79 |
| Cr₂O₃ | 0.08 |
| K₂O | 0.09 |
| Na₂O | 0.03 |
| Loss on Ignition (LOI) | 0.10 |
Physical Properties
Appearance
Light blue to grey powder
Bulk Density
~3.6 g/cm³
Mohs Hardness
6.5–7.0
Melting Point
~1810 °C
Grain Size
80-100 MESH
Transformation Temperature
Above 1350 °C (converts to mullite + silica)
Key Advantages
- Excellent thermal shock resistance
- High refractoriness and chemical stability
- Improves strength and density in fired refractories
- Volume expansion on heating enhances product performance
- Superior high-temperature stability
📦 Packaging
25 kg bags or 1 MT jumbo bags, with palletized or customized packaging available