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The bauxite (red-brown solid) - aluminium oxide mixed with impurities-is extracted from the earth. The extracted aluminium oxide is then treated with alkali, to remove the impurities. This results in a white solid called aluminium oxide or alumina.
Site Search. Aluminium is derived from the ore bauxite. First bauxite is mined from typically shallow deposits, and then it is refined into alumina (alumina hydroxide â Al2O3) using the Bayer process at an alumina refinery.irst bauxite is mined from typically shallow deposits, and then it is refined into alumina (alumina hydroxide â Al2O3) using the Bayer process at an alumina refinery.