Method for processing bauxites

Details Method for processing bauxites Method for processing bauxites

1974-07-03

1976-03-16

Carter, Herbert T.

Chemistry of inorganic compounds

Treating mixture to obtain metal containing compound

Group iiia metal or beryllium

423128, 423129, 423131, C01F 706

Patent

active

039446484

ABSTRACT:
A method for processing bauxites according to the Bayer technology, with an increased yield in Al.sub.2 O.sub.3 and with decreased caustic soda losses, starting particularly from goethite bauxites of boehmite and/or diaspore type and carrying out the digestion at 180.degree.C to 300.degree.C using an aluminate liquor containing Na.sub.2 O.sub.caustic in a concentration of 80 to 300 g./l. The digestion is carried out in the presence of a calcium compound in an amount corresponding to 2 to 6 % of CaO calculated for the dry weight of bauxite and of a sulfate salt in an amount corresponding to 1.0 to 7.0 g./l. of sulfate ion concentration, whereby the goethite content of the bauxite is converted into hematite. The process provides advantageous conditions for the complete dissolution of the boehmite and diaspore content of bauxite in the vicinity of the equilibrium molar ratio, and enables to recover efficiently the caustic soda losses in the Bayer process itself, requiring no supplementary operation.

REFERENCES:
patent: 663167 (1900-12-01), Hall
patent: 1422004 (1922-07-01), Sherwin
patent: 2181669 (1939-11-01), Scholder
patent: 2519362 (1950-08-01), Flint et al.
patent: 2926069 (1960-02-01), Perrin et al.
patent: 3210155 (1965-10-01), Cagnolatti et al.
patent: 3737514 (1973-06-01), King

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