Kyanite

Kyanite is a high-alumina silicate mineral with chemical formula Al₂SiO₅, known for its excellent refractory properties and outstanding high-temperature volume stability. The material appears as a light blue to grey powder with consistent physical performance.

When heated above 1350 °C, kyanite transforms into mullite and free silica, producing controlled volume expansion that improves density and mechanical strength of refractory products. This unique behavior makes kyanite an ideal raw material for advanced refractory and ceramic applications.

$Kyanite Refractory Application$

Main Applications

Raw material for refractory bricks and castables
Foundry molds and kiln furniture
Additive for ceramics and spark plugs
Mullite formation ingredient 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

Item	Value
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	>1350 °C (to mullite + silica)

Key Advantages

Excellent thermal shock resistance
High refractoriness and chemical stability
Improves strength and density of fired refractories
Volume expansion enhances product performance
Superior high-temperature stability

Packaging

Kyanite is supplied in 25 kg bags or 1 MT jumbo bags. Palletized or customized packaging solutions are available upon request.