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Mining waste generated from aluminium production

Mining waste generated from aluminium production

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Uploaded 22 Feb 2012 by GRID-Arendal
Year: 2006
From collection: Vital Waste Graphics 2
Author: Cécile Marin, Emmanuelle Bournay
Description:
The production of aluminium involves three main stages: mining bauxite ore, refining bauxite to alumina (Al2O3), and then smelting alumina to produce aluminium. Bauxite comes from open mines mainly located in tropical and subtropical regions. On average it takes 4 to 5 tonnes of bauxite to produce 2 tonnes of alumina, yielding 1 tonne of aluminium. The main solid by-product of the alumina extraction (Bayer process) is red mud and roughly 3 tonnes is left for every tonne of alumina.
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