PRELIMINARY TREATMENT OF MOLTEN IRON

摘要

PURPOSE:To desulfurize and dephosphorize molten iron efficiently as a preliminary treatment and to reduce the time for treatment by blowing a desulfurizing agent and a dephosphorizing agent separately and simultaneously to the molten irons on both sides in the long axis direction of a mixer car. CONSTITUTION:A desulfurizing agent is blown together with gas from a dispenser 4 for the desulfurizing agent through a lance 3 into the molten iron 2 in the region 1A on the long axis side of a mixer car 1 and the molten iron 2 is brought into contact with the desulfurizing agent under stirring in said region 1A. On the other hand, a dephosphorizing agent is blown together with gas from a dispenser 6 through a lance 5 into the molten iron 2 in the region 1B on the other side in the long axis direction of the car 1 and the molten iron 2 is brought into contact with the dephosphorizing agent under stirring in the region 1B. The desulfurizing agent blown into the region 1A and the iron 2 to be brought into contact therewith under stirring are not mixed directly with the dephosphorizing agent blown in the region 1B and the iron 2 to be brought into contact therewith under stirring in this case. Therefore, the desulfurization reaction and the dephosphorization reaction proceed independently and efficiently respectively under optimum conditions. The entire part of the molten iron in the car 1 is finally desulfurized and dephosphorized by the slow mixing of the irons 2 between the region 1A and 1B.