| 摘要 |
PURPOSE:To uniformize the in-furnace reaction particularly in the end period of blowing so as to accelerate in-furnace equil. reaction and to prevent sloppy, by blowing an inert gas together with gaseous oxygen into a converter from a lance disposed on the upper part of the converter thereby stirring a steel bath. CONSTITUTION:The inert gas is blown together with the oxygen into the steel bath from the lance 11 made into the construction formed with a flow passage 13 for the inert gas such as Ar on the inside and a flow passage 12 for the oxygen on the outside. The flow rate of the inert gas is afterward increased and the flow rate of the oxygen is decreased when the stirring force in the end period of blowing is needed. The formation amt. of the (FeO) in the slag formed at the fine point is thereby decreased and the stirring power needed in the end period of blowing is assured, by which the compsn. of the slag in the furnace, more particularly the total content of Fe in the slag are uniformized to accelerate the in-furnace equil. reaction and to prevent slopping. Since the inert gas passes the central part in the above-mentioned lance 11., the nonuniformith in the concn. of the (FeO) in the fire point is eliminated.
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