Transcription of Chapter 2. Production and Processing of Aluminum
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7 Chapter 2. Production and Processingof extraction of AluminumThe extraction of Aluminum from its ore and subsequent Processing into finished prod-ucts takes place in a series of successive operations, each largely independent of the the various processes are carried out at different plant sites. A summary ofproduction steps from the bauxite mine through casting is given in Fig. Bauxite miningAluminum comprises approximately 8% of the earth s crust, making it second only tosilicon ( ). Iron is third at about 5%. Metallic Aluminum is not found in nature; itoccurs in the form of hydrated oxides or silicates (clays). The principal ore from whichaluminum is extracted is called bauxite after the town of Les Baux in southern Francewhere the ore was originally discovered.
The extraction of aluminum from its ore and subsequent processing into finished prod-ucts takes place in a series of successive operations, each largely independent of the other. ... gas. Liquid aluminum settles on the bottom of the cell since it is denser (specific gravity 2.3 at 960°C) than the
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