Treatment of blast furnace off-gas

Details Treatment of blast furnace off-gas Treatment of blast furnace off-gas

B - Operations, Transporting

01

D

165/1, 23/360

B01D 53/00 (2006.01) B01D 47/00 (2006.01) C21B 7/00 (2006.01)

Patent

CA 1143926

ABSTRACT Off-gas produced by a blast furnace is treated by scrubbing and cooling the gas with water and then settling solids from the liquid effluent. The liquid effluent is cooled following settling, and a major portion of the cooled effluent is recirculated for another pass through the scrubbing and cooling steps. The remainder of the effluent is chemically treated, and heavy metals are precipitated and settled as sludge. The clarified effluent is filtered and then treated with a cation exchange resin in a sodium cycle. A substantial part of the ion-exchange-treated effluent is returned to the scrubbing and cooling steps, and another substantial part is discharged as blowdown. Return of water which is of adequate quality to prevent scaling significantly reduces the make-up requirements. By discharging the ion-exchange-treated effluent to blowdown while ammonium ions are being removed from standards for maximum blowdown results in an accompanying reduction in the discharge of the other toxic contaminants.

371589

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