高碳钢钢包精炼炉造白渣工艺研究  

Research on the process of refining and making white slag to improve the purity of high carbon steel

作　　者：孙国敏 李志伟[1] 杨锁兵 刘万善[1] 胡冬东 SUN Guomin;LI Zhiwei;YANG Suobing;LIU Wanshan;HU Dongdong(Ningbo Iron and Steel Co.,Ltd.,Ningbo 315807,Zhejiang,China)

机构地区：[1]宁波钢铁有限公司,浙江宁波315807

出　　处：《江西冶金》2023年第2期142-146,共5页Jiangxi Metallurgy

摘　　要：为提高高碳钢水的纯净度,对钢包精炼炉(LF炉)精炼造白渣工艺进行优化。在LF精炼造渣过程中加入铝粉压球脱氧,研究渣的还原性、碱度(R)、钙铝比、成分及铝粉压球用量对钢水全氧量(w(T.O))的影响。结果表明,当渣中w(CaO)=52%~58%、w(Al_(2)O_(3))=28%~33%、w(SiO_(2))=8%~12%、w(TFe+MnO)<1.56%、R=4.6~5.3、钙铝比为1.60~1.77时,可有效降低钢水中的全氧量。与工艺优化前相比,精炼结束后钢水全氧量低于10^(-5)的炉数占比由27%提高至81%,平均全氧量由1.4×10^(-5)降至9.5×10^(-6);优化后的钢水平均回硅量由0.044%提高至0.095%。钢水成分控制时应考虑回硅量,以避免硅含量超标。In order to improve the purity of high carbon steel,the Ladle Furnace(LF) refining slag is optimized.The effects of slag reducibility,slag basicity (R),the ratio of calcium to aluminum in slag,slag composition and the amount of aluminum balls on the total oxygen content of molten steel were studied by adding aluminum powder press-balling to deoxidation in the slag forming process of LF refining.The results showed that the total oxygen content(w(T.O)) effectively decreased when the composition of LF refining slag was w(CaO)=52%-58%,w(Al_2O_3)=28%-33%,w(SiO_(2))=8%-12%,w(MgO)=3%-7%,w(TFe+MnO)1.56%,R=4.6-5.3,and w(CaO)/w(Al_2O_3)=1.60-1.77.Based on the optimization of the process of making slag,the proportion of w(T.O) in the molten steel after refining increased from the original 27%(within 10~(-5)) to 81%,and the average w(T.O) of the refining was reduced from the original 1.4×10-~5 to 9.5×10-~6.After optimization,the average amount of silicon reversion in molten steel increased from 0.044%to 0.095%.To avoid exceeding the silicon content,it is necessary to control the silicon reversion in molten steel.

关 键 词：高碳钢 钢包精炼炉 白渣 全氧量 

分 类 号：TF718[冶金工程—钢铁冶金]