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Question

For each substance listed below, explain its significance in extraction of aluminium.

Bauxite


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Solution

  • Extraction of Aluminium is done from its main ore Bauxite (Al2O3.2H2O). It is done by the electrolytic reduction technique.
  • There is about 40-60% alumia (Al2O3) in bauxite ore.
  • It also contains some impurities like Iron oxide(Fe2O3), Silicon oxide(SiO2) and Titanium oxide(TiO2).
  • These impurities are removed first to obtain alumina. Baeyer's process is used for this purpose.

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