FIELD: chemistry.
SUBSTANCE: invention relates to recycling fly ash from electric power stations. Fly ash is ground and iron is removed by wet magnetic separation. Hydrochloric acid is added to the obtained filter cake to obtain a hydrochloric leachate which is passed through a macro-porous cationic resin to deeply remove iron to obtain a refined aluminium chloride solution. The refined aluminium chloride solution undergoes concentration and crystallisation to obtain crystalline aluminium, which is then calcined to obtain metallurgical-grade alumina.
EFFECT: invention improves alumina extraction.
17 cl, 2 tbl, 2 dwg, 13 ex
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