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Extraction of pure aluminium from white bauxite ore (bauxite containing SiO2 as the major impurity) involves which of the following processes?

1. Fusion with coke in presence of N2
2. Auto reduction
3. Carbon reduction
4. Electrorefining

Correct answer: Electrorefining

Solution

Aluminium is extracted via electrolytic reduction of pure Al2O3 in the Hall-Heroult process; obtaining 99.99% pure Al from the crude metal then uses electrorefining (Hoopes process). Auto-reduction and carbon reduction do not apply to Al.

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