| 摘要 |
PROBLEM TO BE SOLVED: To conduct a desiliconization treatment efficiently, discharge slag from a hot metal ladle efficiently by consecutively treating the hot metal ladle with gradient and improve productivity.SOLUTION: An inclination angle of a hot metal ladle &thetas; is 3.0≤&thetas;≤9.0, and in a desiliconization treatment, an injection amount of iron oxide containing Fe=50 to 80 mass% is 1.0 to 22.2 kg/t, height of an oxygen lance is 0.65 to 1.50 m, a gaseous oxygen flow is 0.15 to 0.30 Nm/min t, a discharge angle α of an injection lance is 0≤α≤&thetas;+20, a submergence depth of the injection lance is 1.5 to 2.0 m and a nitrogen gas flow of the injection lance is 0.0056 to 0.020 Nm/min t. |
