Aluminum production

Videonummer 11937732
Aluminum smelting process. This is the production of aluminum metal from aluminum ore (bauxite). The first stage (left) is the Bayer Process to produce alumina (aluminum oxide) from the raw bauxite. The bauxite is crushed (top); chemically digested in sodium hydroxide; alumina hydrate is precipitated (brown) and then heated to form the pure alumina (yellow). The conveyor belt deposits the alumina in molten cryolite (sodium aluminum fluoride), which reduces the melting point to 1000 degrees Celsius. Electrolysis (Hall-Heroult Process) is used to obtain molten aluminum metal.
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Credit: Science Photo Library
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Länge: 60 Sekunden
Seitenverhältnis: 16:9
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