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Extraction of Aluminium PowerPoint PPT Presentation


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Extraction of Aluminium. Aluminium is extracted using electrolysis because it is too reactive to be extracted using carbon. Raw materials. Ore – bauxite – aluminium oxide The ore is dissolved in cryolite to lower the melting point. The electrolysis cell. Carbon anode. Molten - PowerPoint PPT Presentation

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Extraction of Aluminium

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Extraction of aluminium l.jpg

Extraction of Aluminium

Aluminium is extracted using electrolysis because it is too reactive to be extracted using carbon.


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Raw materials

Ore – bauxite – aluminium oxide

The ore is dissolved in cryolite to lower the melting point.


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The electrolysis cell

Carbon anode

Molten

aluminium oxide

Oxygen bubbles

cathode

Molten aluminium

Steel case

Temperature 900 C


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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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Cost

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