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Al2O3 varies from 45 to 95%. Commonly used refractory are sillimanite (Al2O3 61%) and mullite (70 – 85% Al2O3)Some of the properties are
- High refractoriness
- Better resistance to slag and spalling
- Higher load bearing capacity.
- Fusion point >1850oC .
Uses: B F stoves, cement and lime rotary kilns, electric are furnace roofs, ladle, glass making furnaces, etc.
Chromite – Magnesite: Amount of chrome ore is magnesite. Some properties are
- Used up to 1700oC
- Resistant to thermal shocks
- Basic in nature
Uses in: Inner lining of basic oxygen steelmaking vessel, Side walls of soaking pits etc
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