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小颗粒石灰石化渣脱磷热力学分析 被引量:2

Thermodynamic analysis of slagging and dephosphorization for small particle limestone
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摘要 为探索转炉喷吹石灰石粉造渣炼钢的最佳工艺条件,基于化渣脱磷基础试验,对小颗粒石灰石的化渣脱磷效果进行热力学分析。采用单变量试验方法,探究石灰石粒度、反应温度、配渣碱度及FeO含量对石灰石化渣脱磷的影响,进而得到最佳参数。结果表明,平均粒径为0.84 mm的石灰石颗粒化渣脱磷效果最佳,粒径过大或过小均会造成脱磷率降低;试验温度为1 400℃时化渣脱磷效果最佳,低于1 400℃时,化渣不充分且速度较慢,而高于1 400℃时会出现回磷现象。铁水脱磷率随碱度的升高而升高,当配渣碱度R=3.5时,熔渣状态较好,脱磷效果最佳;碱度过高时,熔渣黏度较高,泡沫渣量大,容易溢渣。铁水脱磷率随配渣FeO含量的升高而升高,FeO质量分数为20%时,熔渣状态最佳;当FeO质量分数达到30%时,反应过程中会出现溢渣现象。在试验得出的最佳工艺条件下,石灰石化渣脱磷过程前期脱磷速度快,泡沫渣状态好,渣中固溶体相种类多,终点脱磷率达到85%以上,钢中磷质量分数降到0.02%以下,可以完成脱磷任务。研究结果为开展转炉喷吹石灰石粉冶炼的工业应用提供了理论基础。 In order to explore the optimal process conditions for slagging and steelmaking by injecting limestone powder into the converter,a thermodynamic analysis was conducted on the slagging and dephosphorization effect of small particle limestone based on the basic experiment of slagging and dephosphorization.Using univariate experimental method,the effects of limestone particle size,reaction temperature,slag basicity,and FeO content on the slagging and dephosphorization of limestone were investigated,and the optimal parameters were obtained.The experimental results show that the limestone particles with average particle size of 0.84 mm has the best slagging and dephosphorization effect,and either too large or too small particles can cause decrease in dephosphorization rate.The optimal slagging and dephosphorization effect is achieved at experimental temperature of 1400℃.When the temperature is lower than 1400℃,the slagging is insufficient and the speed is slow,while temperature is higher than 1400℃,there is a phenomenon of phosphorus return.The dephosphorization rate of molten iron increases with the increase of basicity.When the slag basicity R=3.5,the slag is in good condition and the dephosphorization effect is the best.When the basicity is too high,the slag viscosity is high and the amount of foam slag is large,which is easy to overflow.The dephosphorization rate of molten iron increases with the increase of FeO content in the slag.When the FeO mass fraction is 20%,the slag state is optimal.When the FeO mass fraction reaches 30%,slag overflow phenomenon will occur during the reaction process.Under the best process conditions obtained from the experiment,the dephosphorization speed of limestone in the early stage of the slagging and dephosphorization process is fast,the foam slag is in good condition,there are many types of solid solution phases in the slag,and the endpoint dephosphorization rate reaches over 85%.The phosphorus content in steel can be reduced to below 0.02%,which can complete the dephosphoriz
作者 张凯璇 王书桓 李晨晓 姚鑫 孙华康 张昀 ZHANG Kaixuan;WANG Shuhuan;LI Chenxiao;YAO Xin;SUN Huakang;ZHANG Yun(College of Metallurgy and Energy,North China University of Science and Technology,Tangshan 063210,Hebei,China)
出处 《中国冶金》 CAS CSCD 北大核心 2023年第11期62-71,共10页 China Metallurgy
基金 国家自然科学基金资助项目(52004097) 河北省研究生创新资助项目(CXZZBS2022113) 华北理工大学省属高校基本科研业务费项目(JQN2021003)。
关键词 转炉 小颗粒石灰石 化渣 脱磷 工艺参数 converter small particle limestone slagging dephosphorization process parameter
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