FIELD: electrolytic production of aluminum. SUBSTANCE: method involves solving sludges in 90-96% sulfuric acid taken in an amount triple the volume of sludges to be treated; providing additional treatment in sulfuric acid with concentration not below 30%; separating solid sediment from solution obtained; treating solution obtained with carbonates or hydroxides of alkaline and alkaline-earth metals to obtain precipitate iron, aluminum and magnesium in the form of hydroxides. EFFECT: increased efficiency and reduced contamination of environment. 2 cl
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