Extraction of alumina from bauxite

Details Extraction of alumina from bauxite Extraction of alumina from bauxite

C - Chemistry, Metallurgy

01

F

23/246

C01F 7/02 (2006.01) C01F 7/06 (2006.01)

Patent

CA 1044439

A B S T R A C T In the production of alumina by the Bayer process from bauxite containing gibbsite and boehmite and having an iron content below 5% (calculated as Fe2O3) the extraction of boehmite in the digestion stage (which is carried out at 225-270°C) is improved by incorporating an iron-containing mineral, in which iron oxide is present in very fine particle size, in sufficient quantity to raise the Fe2O3/ TiO2 ratio to at least 1.3. The iron-containing mineral may be a high-iron bauxite.

227580

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