CPC C21C 7/0087 (2013.01) [C21C 7/0025 (2013.01); C21C 7/0075 (2013.01); C21C 7/072 (2013.01); C21C 7/0645 (2013.01)] | 18 Claims |
1. A slag discharging method in a process of producing ultra-low phosphorus steel, comprising:
adding lime along with molten steel, while pouring the molten steel into a steel ladle, so as to slag in advance and form basic slag;
blowing oxygen to a top of the steel ladle and blowing argon to a bottom of the steel ladle for converting;
tilting the steel ladle so that a surface of the molten steel is close to an opening of the steel ladle; and
adding a carbon-containing reducing agent so that the basic slag is foamed and overflows from the opening of the steel ladle,
wherein an oxygen supply intensity for blowing oxygen to the top of the steel ladle is 50-300 NL/(min·t), and a pressure is 0.5-2.0 MPa.
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