FIELD: chemistry.
SUBSTANCE: invention relates to separation of iron ions from aluminium ions contained in an acidic composition. Methods comprise reacting acidic composition with a basic aqueous composition having a pH of at least 10.5 so as to obtain a precipitation composition, maintaining precipitation composition at a pH above 10.5 so as to cause precipitation of iron ions. Precipitation of aluminium ions is substantially prevented and a mixture comprising a liquid portion and a solid portion is obtained. Liquid is separated from solid part.
EFFECT: obtaining products, such as aluminium oxide, aluminium, haematite.
20 cl, 4 dwg, 2 ex
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