Process for digesting bauxite

Details Process for digesting bauxite Process for digesting bauxite

C - Chemistry, Metallurgy

22

B

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C22B 21/00 (2006.01) B01J 23/02 (2006.01) B01J 23/16 (2006.01) B01J 23/76 (2006.01) C01B 33/20 (2006.01) C01B 33/26 (2006.01) C01F 7/06 (2006.01) C01F 7/38 (2006.01)

Patent

CA 1114173

ABSTRACT OF THE DISCLOSURE The invention is a process for digesting bauxite containing one or more of diaspore, goethite and hematite at a temperature of 180 to 300°C. with the aid of an aluminate liquor having a sodium oxide content of from 80 to 300 g/l, wherein the digestion is carried out in the presence of a hydrogarnet catalyst having a composition of A3 B2/SiO4/3-x/(OH)4/x in an amount corresponding to 5 - 20% by weight calculated on the dried weight of bauxite, where A is Ca2+ and/or Mg2+ and/or Mn2+ and/or Fe2+ and s is Al3+ and/or Fe3+ and/or Cr3+. The presence of the catalyst leads to increased yield of alumina.

285791

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