Discussion
Primary aluminium smelting is exceptionally energy intensive because the metal is produced by
Answer: C
Correct answer: electrolysis of its oxide
Aluminium is too reactive to be reduced by carbon, so it is won by passing a very large current through alumina dissolved in molten cryolite. Electrolysis is inherently costly in energy, and at around 13 to 15 MWh per tonne the smelter is generally sited where electricity is cheap rather than where the ore is.
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