METHOD FOR PROCESSING ALUMINIUM-CONTAINING ASHES RESULTING FROM COMBUSTION OF COALS Russian patent published in 1997 - IPC

FIELD: non-ferrous metallurgy. SUBSTANCE: ash is subjected to magnetic separation to obtain weakly magnetic fraction and strongly magnetic one. Weakly magnetic fraction is blended with limestone and soda. Blend thus-prepared is subjected to pelletizing and sintering. Sinter is cooled down, crushed leached with soda solution. Resulting slurry is filtered to remove from solution first silicon and next aluminium. Solid residue resulting from leaching treatment is used to produce cement. EFFECT: method offers complex processing of aluminium-containing ashes and yields number of useful products. 6 cl, 1 tbl