Aluminum oxide: Difference between revisions
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(Created page with "{{Compound |name=Aluminum oxide |chemf=Al2O3 |density=3.95-4.1 |mm=101.96 |mp=2072 |bp=2977 |sol_aq=insoluble |nfpa_h=1 |stp_p=solid |stp_q=white }} Aluminum oxide is a mineral form of aluminum oxide, {{#Chem: Al2O3}}. It is a minor constituent of sand and clay. It rarely occurs in pure form. ==Uses== * Primary feedstock for aluminum * Refractory: melting point 2072°C ==Natural Occurrence== * Aluminum oxide '''does''' occur naturally as bauxite ==Haz...") |
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{{Compound | {{Compound | ||
| | |chemf=Al2O3|struct=none | ||
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|density=3.95-4.1 | |density=3.95-4.1 | ||
|mm=101.96 | |mm=101.96 | ||
Latest revision as of 02:10, 18 December 2024
| Chemical formula | Al2O3 |
|---|---|
| OTP appearance | white solid |
| Molar Mass(g/mol) | 101.96 |
| Density(g/cc) | 3.95-4.1 |
| Melting Point(°C) | 2072 |
| Boiling Point(°C) | 2977 |
| Solubility in water(g/L) | insoluble |
| NFPA 704 |  0
1
0
|
Aluminum oxide is a mineral form of aluminum oxide, Al2O3. It is a minor constituent of sand and clay. It rarely occurs in pure form.
Uses
- Primary feedstock for aluminum
- Refractory: melting point 2072°C
Natural Occurrence
- Aluminum oxide does occur naturally as bauxite
Hazards
- GRAS
- Inhalation danger for fine particles / fibers
Production
Bauxite is 30-55% aluminum oxide, with the remainder being silicon and iron oxides. To produce pure aluminum oxide, it must be processed into aluminum hydroxide.
Synthesis
from aluminum hydroxide
- Calcine aluminum hydroxide, producing aluminum oxide and water:
- 2 Al(OH)3{Al2O3 + 3 H2O1100°C}→
- 2 Al(OH)3