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 1047230

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 is improved by introducing lime during, preferably at the beginning of, the digestion stage which is carried out at a temperature of 225-270°C.

227579

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