Abstract
Experimental and theoretical studies have been carried out to clarify metallurgical reactions in combined blowing converters affected by the oxygen flow rates from the top and the bottom of the furnace.
The 5t combined blowing converter showed the decrease in oxygen content in the bath with the increase in the oxygen flow rate from the bottom, while the 5t bottom blowing converter showed the decrease in oxygen content with the decrease in the oxygen flow rate. Thease experimental results are interpreted in terms of an index, I, related to the inverse of the oxygen efficiency used for decarburization, which has been introduced by considering the different reaction sites brought by the top blown and the bottom blown gases. Oxygen content in steel melt and ( T. Fe) in slag decrease with the decrease in the I value from LD to Q-BOP, which indicates that the I is suitable for characterizing metallurgical reactions.
The metallurgical reactions at blow end can be controlled by changing the oxygen flow rates of top and bottom blowings, based on the aimmed I value.
