how is aluminium extracted from its ore
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- Bauxite is first sent to alumina refinery before being sent to aluminium smelter.
- In alumina refinery, aluminium oxide is separated from iron oxide constituent by solubilizing aluminium oxide in sodium hydroxide solution. This process is called the Bayer Process
- In aluminium smelting facility, aluminium is produced from aluminium oxide by means of electrolysis. Cryolite is added to lower the melt temperature. This process is called Hall-Heroult process
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