FIELD: water treatment. SUBSTANCE: method comprises use of aluminum-containing slag including fraction below 0.1 mm, washing of these particles until dissolution of salts begins, formation of pulp by stirring washed slag with water, dissolution and removal of alkali metal salts by aqueous phase of pulp, and finally treatment of solid phase of pulp with aqueous hydrochloric acid and separating coagulant by filtration. EFFECT: enabled complete use of slag. 2 cl
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