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Answer: Bauxite is an aluminium ore. Aluminium can be mined inexpensively and profitably from bauxite. However, while aluminium can be found in clay, it is not cost-effective or profitable to extract aluminium from clay.
Bauxite’s chemical formula is Al2O3.2H2O.
The bauxite is washed in a hot sodium hydroxide (NaOH) solution, which leaches aluminium from the bauxite, in the Bayer Process. Aluminium hydroxide, Al(OH)3, is formed when aluminium is precipitated out of solution. After that, the aluminium hydroxide is calcined to produce alumina, Al2O3.
