摘要
采用转炉喷吹石灰石粉造渣炼钢技术,可以提高铁水脱磷效率、对二氧化碳进行资源化利用。基于小颗粒石灰石与石灰化渣脱磷基础试验,对比分析小颗粒石灰石与石灰在相同条件下的化渣脱磷效果,计算了采用小颗粒石灰石造渣炼钢过程炉气的收益。研究表明,采用小颗粒石灰石冶炼前期脱磷速度快,冶炼5 min脱磷率可以达到49.2%,脱磷速率达到0.011 8%/min,而采用小颗粒石灰冶炼5 min脱磷率为41.2%,脱磷速率为0.009 8%/min;小颗粒石灰石与石灰冶炼脱磷效果相当,反应终点脱磷率分别为87.50%和89.08%,冶炼终点脱磷率均可以达到85%以上。小颗粒石灰与石灰石均可以实现均匀化渣,渣中元素分布均匀,石灰石脱磷渣P元素质量分数为9%,石灰脱磷渣P元素质量分数为8%,采用石灰石炼钢造渣时前期炉渣中P元素含量更高。采用小颗粒石灰石造渣炼钢时,石灰石分解产生的二氧化碳可以与铁水中多种元素反应,其利用率可以达到40%;石灰石分解产生的二氧化碳替代部分氧气参与氧化反应并生成一氧化碳,吨钢炉气中一氧化碳增加量约6.5 m^(3)。研究结果为开展转炉喷吹石灰石粉造渣炼钢的工业应用提供理论基础,可推动绿色冶金进一步发展。
The technology for converter injection of limestone powder for slagging steelmaking can improve the effi-ciency of iron dephosphorization and the resource utilization of carbon dioxide.Based on basic experiments of de-phosphorization of small particle limestone slag and lime slag,the slag dephosphorization effect of small particle limestone and lime under the same conditions was compared and analyzed,and the furnace gas benefit using small particle limestone for steelmaking process was calculated.Research has shown that the early stage of using small particle limestone for smelting has a fast dephosphorization rate,and after 5 minutes of smelting,the dephosphoriza-tion efficiency can reach 49.2%,and the dephosphorization rate can reach 0.0118%/min.When the small particle lime is used for smelting for 5 min,the dephosphorization efficiency is 41.2%,and the dephosphorization rate is 0.0098%/min.The dephosphorization effect of small particle limestone smelting is equivalent to that of lime smel-ting.The dephosphorization efficiency of small particle limestone and lime at the end of reaction is 87.50%and 89.08%,respectively,and the dephosphorization rate of small particle limestone and lime at the end of smelting is both more than 85%.Both small particle lime and limestone can achieve homogenization of slag,with a uniform dis-tribution of elements in the slag.The mass fraction of P element in limestone dephosphorization slag and lime de-phosphorization slag is 9%and 8%,respectively.When using limestone for slagging steelmaking,the P element content in slag in the early stage is higher.When using small particle limestone for slagging steelmaking,the carbon dioxide produced by limestone decomposition can react with various elements in molten iron,and its utilization rate can reach 40%.The carbon dioxide produced by the limestone decomposition replaces some oxygen to participate in the oxidation reaction,generating carbon monoxide.The carbon monoxide in the gain furnace gas is about 6.5 m^(3) per ton of steel.The research results provide a theoretical basis for the industrial application of converter injection limestone powder slag making and steelmaking,and promote the further development of green metallurgy.
作者
孙华康
田鹏
薛月凯
丁志军
王书桓
李晨晓
SUN Huakang;TTIAN Peng;XUE Yuekai;DIING Zhijun;WANG Shuhuan;LI Chenxiao(College of Metallurgy and Energy,North China University of Science and Technology,Tangshan 063210,Hebei,China;Ironmaking Raw Materials Department,Tangsteel International Engineering Technology Co.,Ltd.,Tangshan 063000,Hebei,China;Shisteel Company,HBIS Group Co.,Ltd.,Shijiazhuang 050031,Hebei,China)
出处
《中国冶金》
CAS
CSCD
北大核心
2024年第5期125-132,共8页
China Metallurgy
基金
国家自然科学基金资助项目(52274334)
河北省自然科学基金资助项目(E2023209107)
河北省高等学校科学技术研究项目(BJK2022059)
唐山市科技局重点研发项目(23150219A)。
关键词
转炉炼钢
小颗粒石灰石
脱磷
炉气
二氧化碳
converter steelmaking
small particle limestone
dephosphorization
furnace gas
carbon dioxide
作者简介
孙华康(1997-),男,硕士,E-mail:15614566552@163.com;通信作者:薛月凯(1985-),男,博士,副教授,E-mail:xueyuekai965@163.com。
