METHOD FOR BAUXITE REPROCESSING Russian patent published in 2006 - IPC C01F7/06 C01F7/14 

FIELD: alumina production.

SUBSTANCE: Bayer method for alumina production from bauxite includes bauxite breakage, wet milling in presence of reversible solution obtained after mother liquor boiling down, dilution of leached pulp, thickening, filtration, decomposition of aluminate solution to isolate aluminum hydroxide and to produce mother liquor, aluminum hydroxide calcination to produce alumina, and non-operative decomposer cleaning by precipitate washing with alkali solution. Part of mother liquor is boiled down up to concentration of 220-260 g/l Na₂O₃ and fed in decomposition step into non-operative decomposers to cleaning thereof from aluminum hydroxide precipitate. After cleaning process solution is decomposed in operative decomposers.

EFFECT: method with improved processibility index and efficiency.

1 dwg