Research of the FeO Content Control in Final Slag of Converter
This paper studied the factors affecting the final slag FeO content of the converter from the amount of ore added at the end of blowing,stop blowing carbon content,stop blowing oxygen content,the alkalinity and the MgO content in slag,the content of ladle phosphorus.The study showed that the amount of ore added in the final stage of blowing was positively related to the increment of FeO content in the slag.Stop blowing oxygen content and FeO activity was proportional to the relationship.Stop blowing carbon and FeO activity was inversely proportional relationship.The alkalinity in slag was positively correlated with FeO in slag.The MgO content in slag wass negatively correlated with FeO in slag.In order to control the slag FeO content of less than 18％,in the later stage,the ore addition should be controlled within 1 000 kg,stop blowing carbon content was greater than 0.04％,free oxygen was less than 0.060％,MgO slag content of 8.0％to 12.0％and slag alkalinity between 2.8 to 4 were controlled.For the phosphorus content of steel less than 0.012％,the slag alkalinity must be controlled between 4.0 and 5.0.
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