Raw materials. Ore bauxite aluminium oxide The ore is dissolved in cryolite to lower the melting point.. The electrolysis cell . . Carbon anode. Moltenaluminium oxide . cathode. Oxygen bubbles. Steel case. Molten aluminium. Temperature 900 C. 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..
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Extraction of Aluminium
Aluminium is extracted using electrolysis because it is too reactive to be extracted using carbon.
Ore – bauxite – aluminium oxide
The ore is dissolved in cryolite to lower the melting point.
Temperature 900 C
Al3+ + 3e- Al
2O2- O2 + 4e-
Extracting aluminium is expensive because of the high
cost of electricity. Extraction takes place where there is a
cheap source of electricity e.g. hydroelectric power