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1. Extraction of Aluminium Aluminium is extracted using electrolysis because it is too reactive to be extracted using carbon.
2. Raw materials Ore ? bauxite ? aluminium oxide
The ore is dissolved in cryolite to lower the melting point.
3. The electrolysis cell
4. Reactions in the cell At the cathode
Al3+ + 3e- ? Al
At the anode
2O2- ? O2 + 4e-
The oxygen formed reacts with the carbon anodes to form carbon dioxide.
They have to be replaced periodically.