When the converter is discharging steel, the molten steel level gradually drops. When it is lower than a certain critical value, a vortex will be formed above the discharging port, which is easy to involve the slag into the ladle.After the slag ball is put into the converter, the slag ball is pushed to the top of the steel outlet by virtue of the effect of vortex, to prevent the steel slag from being sucked into the ladle, and the molten steel continues to flow out from the gap between the slag ball and the steel outlet, so as to reduce the amount of slag.

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