Hall–Héroult Process: Aluminium smelting process
The Hall–Héroult process is the major industrial process for smelting aluminium.
This article uses too much jargon, which needs explaining or simplifying. (January 2024) |
It involves dissolving aluminium oxide (alumina) (mainly from bauxite, aluminium's chief ore, through the Bayer process) in molten cryolite, and electrolysing the molten salt bath, usually in a purpose-built cell. The Hall–Héroult process applied at industrial scale happens at 940–980 °C and produces 99.5–99.8% pure aluminium. Recycled aluminum requires no electrolysis, thus it does not end up in this process. This process contributes to climate change through the emission of carbon dioxide in the electrolytic reaction.
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