METHOD FOR PRODUCING ALUMINIUM CHLORIDE-CONTAINING COAGULANTS Russian patent published in 1997 - IPC

FIELD: chemical industry. SUBSTANCE: proposed method resides in electrolytically dissolving aluminium metal in mixture of 5- to 10%-hydrochloric acid solution. and natural bischofite in ratio (0.9-0.1):(0.1-0.9) parts by volume, or else in pre-dissolving aluminium metal in 5- to 10%-hydrochloric acid solutions, followed by mixing solutions thus-obtained with natural bischofite in ratio (0.9-O.1):(O.1-0.9) parts by volume and by subsequent electrolysis using alternating current, frequency 50 Hz, current density 0.5-5.0 A/sq.dm, for 5-30 hours. Electrolysis is not accompanied by polarization processes. EFFECT: good-quality coagulants are produced. 2 cl, 1 tbl