Extraction of Aluminium

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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..
Extraction of Aluminium

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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.

5. Cost


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