CPC C21C 5/4606 (2013.01) | 12 Claims |
1. A lance nozzle configured to blow refining oxygen to molten iron charged in a reaction vessel by blowing a gas from a top-blowing lance to the molten iron, wherein
one or more blowing holes for blowing a working gas into a main hole nozzle of the lance nozzle are provided on an inner wall side surface of the nozzle at a site where the lance nozzle has a minimum cross-sectional area in a nozzle axis direction or at a neighboring site of the site,
wherein the working gas is received from outside of the reaction vessel,
wherein in the neighboring site, the nozzle has a cross-sectional area in the nozzle axis direction of not more than 1.1 times the minimum cross-sectional area in the nozzle axis direction, and
wherein a total of hole lateral widths of respective openings of the blowing holes is not less than 25% and not more than 75% of a circumference of the nozzle.
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