| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for desulfurizing and dephosphorizing molten iron by which the liquid-phase ratio of slag is improved, the consumption of lime used in the desulfurizing and dephosphorizing treatments of molten iron is saved and the desulfurizing efficiency and the dephosphorizing efficiency can be improved. SOLUTION: In the case of performing the dephosphorizing treatment by injecting dephosphorizing flux from a lance 23 and also blowing gaseous oxygen from a top-blown lance 24 after performing the desulfurizing treatment by dipping the lance 23 into desiticonized molten iron 11 and injecting the lime and aluminum dross, the composition of the slag 28 after performing the desulfurizing treatment is regulated to 2.0-5.0 basicity and 10-25 wt.% Al2O3 concentration to perform the dephosphorizing treatment.
|
