| 摘要 |
PROBLEM TO BE SOLVED: To effectively eliminate the unevenness of erosion of a refractory in the state of scarcely needing the investment of an equipment and to prolong the service life of furnace body in a converter by disposing plural oxygen spouting holes asymmetrically to the center axis of a lance and displacing the lance by a prescribed angle around the center axis according to the erosion of the lining refractory in the converter. SOLUTION: In the converter 1 covering the outermost shell with an iron shell 8 and lining the lining refractory 7 in the converter at the inside of the iron shell, oxygen is blown as gaseous oxygen jet 6 from a top-blown lance 5 and molten steel 3 and molten slag 4 are vigorously stirred to execute the active combustion action of carbon. At this time, since the lining refractory 7 is unevenly eroded by the high temp. generated with the combustion of the carbon and the erosion with the molten slag 4, the oxygen spouting holes 5a arranged at the tip part of the lance 5 are asymmetrically disposed. Then, the lance 5 is displaced by rotating so as to direct the direction where the oxygen jet intensity of the lance 5 is weak to the position having large erosion in the furnace based on the information in the furnace, and during blowing, the lance 5 is fixed.
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