Anionic flocculant for dewatering steel mill sludges

摘要

A method of dewatering BOF scrubbing liquid sludges which contain large amounts of finely divided iron oxides which comprises treating these sludges with a dewatering amount of an acrylamide acrylic acid, N-substituted lower alkyl acrylamide sulfonate terpolymer which contains from 35-80 mole percent of acrylamide, from 10-60 mole percent of acrylic acid and from 1-30 mole percent of the N-substituted lower alkyl acrylamide sulfonate which terpolymer has a reduced specific viscosity (RSV) of at least 25.