| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a steelmaking method for forming basic slag, in which as a slag-making promoter of lime, the conventional fluorite is not used and the same slag-making ratio and developing ratio of slopping as the case of using the fluorite are set and the fluorine is not contained and thus, the fluorine is not eluted into water, so that the environmental contamination is not caused. SOLUTION: In this steelmaking method, the iron bath in a furnace is stirred with a top-blown oxygen-containing gas jet, under condition of using together with gas blowing below the iron bath surface and in the iron bath for stirring the iron bath in the furnace or not using, and thereby, gas-steel bath reaction, typically, decarburizing reaction develops at the fire point of the oxygen- containing gas jet and also, the slag-making of the lime (lime stone, burnt lime) is promoted and simultaneously, the basic slag-steel bath reaction, typically dephosphorizing reaction progresses. In such a case, as the slag-making promoter of the lime, the conventional fluorite is not used and aluminum-containing material (containing pure-aluminum), in which the fluorine is not contained, is used and the slag composition satisfies the following formula. 0.95<=(%CaO/%SiO2)/(% Al2O3)<=1.3.</p> |
