| 摘要 |
PURPOSE: A method for increasing reaction surface between molten steel and slag in ladle which prevents scattering of molten steel by rotating gas plume formed by gas blown into molten steel of ladle. CONSTITUTION: In a method for increasing reaction surface between molten steel(2) and slag(3) received in the ladle by rotating gas plume(4) formed by gas blown into ladle(1), the method comprises a step of setting conditions including gas type, gas flux and bath depth so that Froude Number (Fr') calculated by the following expression becomes 42 or more: Fr'=(ρg·V¬2)/(ρl·g·H), where ρg is density (kg/Nm¬3) of gas, V is rate (Nm/s) of gas, ρl is density (kg/m¬3) of molten steel, g is acceleration of gravity (m/s¬2), and H is depth (m) of water tank; and a step of blowing the set flux of the set gas type into the central part of molten steel filled as much as the set depth of bath.
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