Experimental Research on Reducing the Dust of BOF in CO₂ and O₂ Mixed Blowing Steelmaking Process

Abstract

The thermodynamic theory and experimental research on reducing the dust generation in CO₂ and O₂ Mixed Blowing (COMB) steelmaking process have been undertaken. In labo-scale experiment, data show that the amounts of dust and iron loss keep on decreasing as CO₂ blowing rate increases. Further, dust sampled from 30 t BOF conventional process in Fujian Sanming Iron and Steel Plant has been analyzed, and the dust generation rate in the conventional process reduced from 666 g/s at the 1.5 min point to 215 g/s at the end of blowing. Introducing the technology of the stepped CO₂ blow, the average generation rate of dust is reduced by 12.5% in this experiment compared with the conventional one, while the average generation rate of T-Fe in dust is reduced by 12.7%. This improvement has been made keeping the same decarburization rates. Therefore the stepped CO₂ blowing rate has remarkable effect on dust generation. This research has proved that COMB steelmaking process is effective on a decrease in dust generation along with improved iron yield.