Anionic flocculant for dewatering steel mill sludges

Details Anionic flocculant for dewatering steel mill sludges Anionic flocculant for dewatering steel mill sludges

C - Chemistry, Metallurgy

02

F

53/20, 134/54

C02F 11/14 (2006.01) C02F 1/54 (2006.01) C02F 1/56 (2006.01) C22B 7/00 (2006.01)

Patent

CA 1298088

6530-447 ABSTRACT OF THE DISCLOSURE A method of dewatering basic oxygen furnace 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, when measured as an 0.045% by weight aqueous solution, at a pH of 9.0 and at a temperature of 30°C.

541795

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