| 摘要 |
PROBLEM TO BE SOLVED: To reduce dust developed in a furnace and to improve an iron yield and blowing at a high speed, at the time of blowing by spouting gaseous oxygen jet from a top-blown lance into molten steel in a converter. SOLUTION: The gaseous oxygen jet 20 at the outside spouted from an oxygen blown nozzle 10 having large inclining angleθ1 is periodically passed through the outside of an inside firing pt. 23 with the gaseous oxygen jet 21 spouted from the oxygen blown nozzle 11 having small inclining angleθ2 . The scattered dust developed accompanied with bubble burst 25 developed with the gaseous oxygen blown nozzle 11 at the inside is again returned back to the molten steel 19 by utilizing the velocity energy of the gaseous oxygen jet 20 at the outside to reduce the dust quantity developed in the furnace.
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