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Engineering & Science

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Bayer Process

Crushed bauxite is mixed with caustic soda, and then heated under pressure in steam-jacketed kiers. This is allowed to settle and then filtered (to remove impurities, and crystals of alumina are obtained from the filtered liquor.

These are calcined in large rotary kilns (such as those pictured from BACo’s Burntisland refinery) which drive off the water and convert the hydrate into aluminium oxide.