The effect of foamy slag on basic oxygen steel making process emissions

CIM Bulletin, Vol. 86, No. 974, 1993

E. Cocchiarella, M. S. Greenfield and S. Chubbs, Dofasco, Inc., Hamilton, Ontario

At Dofasco's No. 4 furnace a variation of the basic oxygen steel-making process, Klockner Oxygen Bottom Maxhutte (K-OBM), is used to produce steel. Large amounts of hot gases and paniculate are evolved during the oxygen blowing phase. A quencher and a venturi scrubber are used to collect over 99.5 % of the paniculate. In 1990, the authors investigated the effect of foamy slag on the paniculate emissions from the furnace. The amount of lime added early in the oxygen blowing cycle was reduced, making the slag more viscous and foamy for a six minute period. Instantaneous paniculate emissions were monitored throughout the blow by analyzing quencher and venturi scrubber water samples. Paniculate emissions were reduced up to 59% during the foamy slag period.

Keywords: Basic oxygen processes, Foamy slag, Particulates, Fume suppression, Waste BOF oxides.