基于共存理论的转炉脱磷热力学分析  

Thermodynamic analysis of dephosphorization in converter based on ion and molecule coexistence theory

作　　者：韩凯峰[1] 韩少伟 朱良[1] 江腾飞 杨俊峰 安永超[1] HAN Kai-feng;HAN Shao-wei;ZHU Liang;JIANG Teng-fei;YANG Jun-feng;AN Yong-chao(Steelmaking Department,Beijing Shougang Co.,Ltd.,Tangshan 064404,Hebei,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：《中国冶金》2021年第10期17-22,共6页China Metallurgy

摘　　要：为了定量研究温度、炉渣成分、钢液成分对转炉磷分配比和平衡磷含量的影响,基于共存理论建立转炉炼钢六元渣系的组元活度计算模型和磷分配比L_(P)计算模型,将磷分配比模型计算结果与转炉炼钢实测磷分配比进行对比,发现两者吻合较好。定量计算结果表明,当炉渣碱度为3.8时,钢液温度从1640升到1680℃,平衡磷质量分数从0.0115%增加至0.0198%。同时定量计算了炉渣碱度及氧化铁含量变化对平衡磷含量的影响,但实际炉渣控制需要考虑炉渣黏度、铁损及炉衬侵蚀。转炉吹炼终点钢中元素含量数量级较小,计算表明终点成分变化对磷活度系数的影响不大,各元素对脱磷的影响主要体现在冶炼初期和过程。In order to quantitatively study the effects of temperature,slag composition,and molten steel composition on the phosphorus distribution ratio and equilibrium phosphorus content of converter,the activity calculation model of steelmaking slag components and the calculation model of phosphorus distribution ratio L_(P) were established based on the ion and molecule coexistence theory(IMCT).The calculated L_(P) based on the IMCT agreed well with the measured L_(P) of converter steelmaking.The quantitative calculation results showed that when the slag basicity was 3.8,the molten steel temperature rose from 1640 to 1680℃,and the equilibrium phosphorus mass fraction increased from 0.0115%to 0.0198%.At the same time,the influence of slag basicity and iron oxide content changes on the equilibrium phosphorus content was quantitatively calculated,but the actual slag control needed to consider the slag viscosity,iron loss and furnace lining erosion.The element content in the final steel of converter blowing was of a small order of magnitude.The calculation showed that the change of final molten steel composition had little effect on the phosphorus activity coefficient,and the influence of each element on the dephosphorization was mainly reflected in the initial stage and process of blowing.

关 键 词：共存理论 磷分配比 转炉脱磷 热力学 定量计算 

分 类 号：TF713.3[冶金工程—钢铁冶金]