Canadian Welding Bureau (CWB) Level 3 Practice Exam

Ore of aluminum?

Hematite (Fe2O3) Bauxite (Al2O3) Magnetite (Fe3O4) Galena (PbS)

Correct Answer:

Bauxite (Al2O3)

Explanation:

Aluminum comes mainly from bauxite, the ore that contains aluminum oxide minerals along with water and impurities. In industry, bauxite is refined to produce alumina (Al2O3) through the Bayer process, and then alumina is reduced to aluminum metal in the Hall-Héroult process. The other minerals listed are iron oxides (hematite and magnetite) and a lead sulfide (galena), which are ores for iron and lead, not aluminum.

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