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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.
Aluminium is the most abundant metal in the earthâs crust. The aluminium-containing bauxite ores gibbsite, bÃ¶hmite and diaspore are the basic raw material for primary aluminium production. Proven, economically viable reserves of bauxite are sufficient to supply at least another 100 years at current demand. While demand for bauxite is expected to grow as demand for high quality aluminium products increases, new reserves will be discovered or become economically viable. Gibbsite is an aluminium hydroxide (Al(OH)3), while bÃ¶hmite and diaspore are both aluminium-oxide-hydroxides (AlO(OH)).