PROCEDURE FOR PROCESSING SALT SLAG (SLAKED LIME) FORMED AT ALUMINIUM PRODUCING ELECTROLYSER SHUT DOW

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FIELD : metallurgy. SUBSTANCE : procedure consists in crushing, crumbling and flotation of salt slag. For 1-72 hours salt slag is preliminary poured over with fluoro-soda-bicarbonate water solution with concentration Na2CO3 10-40 g/l, NaHCO3 0-10 g/l, NaF 0-5 g/l, Na2SO4 10-70 g/l and temperature 50-85°C. Salt slag pouring over/conditioning with fluoro-soda-bicarbonate water solution and crushing/crumbling can be combined. Salt slag processing into fluoro-clay-earth-containing concentrate (purification from carbon) is performed by floatation method. EFFECT : elimination of ammonia release. 2 cl, 1 dwg