SPHC钢LF精炼脱硫工艺实践  

Study on LF refining desulfurization process for SPHC steel

作　　者：郭路召 赵艳宇[1] 朱建强[1] 韩凯峰[1] 刘春阳 王建辉[1] GUO Luzhao;ZHAO Yanyu;ZHU Jianqiang;HAN Kaifeng;LIU Chunyang;WANG Jianhui(Steelmaking Department,Beijing Shougang Co.,Ltd.,Tangshan 064404,China)

机构地区：[1]北京首钢股份有限公司炼钢作业部,河北唐山064404

出　　处：《炼钢》2022年第3期31-36,47,共7页Steelmaking

摘　　要：针对低碳低硅钢LF精炼过程脱硫与增硅问题,通过经典热力学分析了脱硫与增硅的规律。计算表明,当钢中w(Al)≥0.01%,即可将S质量分数降至0.01%以下,继续提高Al含量则增加钢液增硅的趋势。工业实践结果与热力学计算表现出较好的一致性。实际生产中,在钢中的S质量分数低于0.02%的条件下脱硫,钢液的增硅量也将增大,最大的增硅质量分数达到0.031 8%;钢液的脱硫量越大,增硅量也越大,当钢中脱除质量分数0.067%的硫时,对应增硅质量分数约0.03%。冶炼中应结合到站Al和S含量综合考虑白灰和铝粒加入量进行造渣,LF精炼结束w(Al)为0.032%~0.038%,精炼渣碱度最适区间为9~11,渣中w(TFe+MnO)为0.6%~0.7%,可同时满足脱硫和减少增硅。Aiming at the problem of desulphurization and silicon increasing in the LF process for low carbon and low silicon steel, the phenomenon of desulphurization and silicon increasing was analyzed by thermodynamic calculation. The results show that when w(Al)≥0.01 % in steel, the mass fraction of S can be reduced to below 0.01 %,and increasing Al content will increase the tendency of silicon increasing in steel. The industrial results are in good agreement with the thermodynamic calculation. In industry production, when the mass fraction of S in steel is less than 0.02 %,the silicon content in molten steel will increase. And the maximum silicon increasing mass fraction is 0.031 8 %. When the mass fraction of S reduces 0.067 %,the silicon mass fraction increases about 0.03 %. During slag forming, the amount of lime and aluminum alloy should be considered combination with the content of Al and S at the process. The final Al mass fraction is between 0.032 % and 0.038 %,the optimum range of basicity of refining slag is 9-11,and w(TFe+MnO) in slag is between 0.6 %-0.7 %,which can meet the requirements of desulfurization and reducing silicon content at the same time.

关 键 词：低碳低硅钢 LF 脱硫 精炼渣 

分 类 号：TF769.2[冶金工程—钢铁冶金]