转炉终渣FeO含量的控制研究

Research of the FeO Content Control in Final Slag of Converter

研究了影响转炉终渣FeO含量的因素,主要从吹炼末期矿石加入量、停吹碳含量、停吹游离氧、炉渣碱度、渣中MgO含量以及钢包磷含量来探索渣中FeO含量的控制方法。研究结果表明,吹炼末期矿石加入量与渣中FeO含量增量呈正相关关系,停吹氧含量与渣中FeO活度成正比例关系,停吹碳含量与渣中FeO活度成反比例关系,渣中碱度与渣中FeO含量呈正相关关系,渣中MgO含量与渣中FeO呈负相关关系。为了控制渣中w(FeO)小于18%,后期将矿石加入量控制在1000 kg以内,停吹w(C)大于0.045%,游离w(O)小于0.060%,渣中w(MgO)控制在8.0%~12.0%,渣中碱度控制在2.8~4.0,对于钢中w(P)上限0.012%以下的钢种,碱度控制在4.0~5.0。

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 1000 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.