Brown Fused Alumina Raw materials:
1. bauxite: main raw material of smelting corundum, corundum ceramics and single crystal corundum. Bauxite, also known as alumina, main content is aluminum trihydrate (Al203 3H20), boehmite (A1203 H20), as well as mixtures of opal, hematite, goethite and other minor components. It has requirements on chemical composition, degree of dehydration, melting point and the block for the production of brown corundum.
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| Brown Fused Alumina |
2. carbon materials: reducing agent of corundum smelting, commonly used material are petroleum coke and anthracite.
3. iron: refining agent and diluents for corundum smelting and dilution of silicon alloy density, commonly used materials are steel scrap, cast iron scrap.
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Brown Fused Alumina Data:
| Item | Data |
|---|---|
| Color | Dark brown (dark blue after firing) |
| Appearance | Trigonal |
| Hardness (Mohs) | ≥9.0 |
| Melting point (℃) | 2250 |
| Maximum use temperature (℃) | 1900 |
| density (g / cm3) | ≥3. 90 |
| Linear expansion coefficient (0-1600 ℃) | 7—9 |
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