How aluminium is made for aircrafts , spacecraft and aluminium products

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The aluminium production process can be broken down into three stages; first bauxites, which contain aluminium, are extracted from the ground. Second, bauxites are processed into alumina or aluminium oxide, and finally in stage three, pure aluminium is produced using electrolytic reduction, a process in which aluminium oxide is broken down into its components using electric current. About 4-5 tonnes of bauxites get processed into 2 tonnes of alumina from which about 1 tonne of aluminium can be made.
There are several minerals available in the world from which aluminium can be obtained, but the most common raw material is bauxite. Bauxite is a mineral made up primarily of aluminium oxide mixed with some other minerals. Bauxite is regarded as high quality if it contains more than 50% of aluminium oxide.
There is a lot of variation in bauxites. Structurally they can be solid and dense or crumbly. The usual colour is brick red, flaming red or brown because of iron oxide. If iron content is low, bauxite can be grey or white. But yellow, dark green and even multi-coloured bauxites with bluish, purple, red and black strains occur too.
About 90% of global bauxite supplies are found in tropical and subtropical areas, with 73% found in just five countries: Guinea, Brazil, Jamaica, Australia and India. Guinea has the largest supply of bauxites, 5.3 billion tonnes (28.4% of the global supply) and the Guinean bauxites are very high quality, containing minimal amounts of admixtures. They're also found very near to the surface, which makes mining them very easy.