| 摘要 |
PROBLEM TO BE SOLVED: To quickly remove impurities contained in a molten metal at a refining treatment.SOLUTION: A reaction efficiency index R, which is a value of [0.0535×A/A+0.0489×A/A+0.131×A/A+0.342×A/A+0.543×h/H+0.030], satisfying a refining treatment of 0.13, A/A=0.1 to 0.6, A/A≤0.10 (including 0) and h/H≤0.20 (excluding 0) is performed when the refining treatment is performed while blowing a gas from a gas discharging tuyere 3 arranged in a blast furnace bottom 2. |
