10B21冷镦钢BOF-LF过程钢渣渣化行为研究  

Study on the steel slag forming behavior in BOF-LF process of 10B21 steel

作　　者：李洋 张涛 杨风国 尹啸 郑冰 徐东[2,5] LI Yang;ZHANG Tao;YANG Fengguo;YIN Xiao;ZHENG Bing;XU Dong(Whole Processes of High Quality Fastener Application Technology Research Center of Universities in Hebei Province,Hebei Taihang Iron and Steel Group Co.,Ltd.,Handan 056305,Hebei,China;Technology Innovation Center for High Quality Cold Heading Steel of Hebei Province,Hebei University of Engineering,Handan 056038,Hebei,China;School of Materials and Metallurgy,University of Science and Technology Liaoning,Anshan 114051,Liaoning,China;Meson Technology(Hebei)Co.,Ltd.,Handan 056000,Hebei,China;Engineering Research Center for High Toughness Wind Tower Steel of Hebei Province,Hebei University of Engineering,Handan 056305,Hebei,China)

机构地区：[1]河北太行钢铁集团有限公司,河北省高校高端紧固件全流程应用技术研发中心,河北邯郸056305 [2]河北工程大学,河北省高品质冷镦钢技术创新中心,河北邯郸056038 [3]辽宁科技大学,材料与冶金学院,辽宁鞍山114051 [4]介子科技(河北)有限公司,河北邯郸056000 [5]河北工程大学,河北省高韧性风塔钢工程研究中心,河北邯郸056305

出　　处：《四川冶金》2023年第6期27-31,共5页Sichuan Metallurgy

基　　金：国家自然科学基金联合基金项目(U20A20272);河北省军民科技协同创新专项(22351001D);河北省高等学校科学技术研究项目资助(CXY2023004)。

摘　　要：在钢铁长流程冶炼过程中,各环节稳定高质量生产都离不开炉渣的重要作用,流程性成渣过程的深入研究对强冶降本、提质增效和资源回用影响显著。本文以10B21冷镦钢生产为背景,研究钢渣在BOF-LF过程的渣化行为。结果表明,经过BOF-LF过程,从化学成分角度,钢渣的二元碱度(CaO/SiO_(2))陡升,而三元碱度(CaO/(SiO_(2)+Al_(2)O_(3)))和全碱度([(CaO)+(MgO)+(MnO)+(FeO)]/[(SiO_(2))+(Al_(2)O_(3))+(P_(2) O_(5))])均呈现下降趋势。从矿物组成分析,转炉渣的主要矿相为CaO、Ca_(2)SiO_(4)、(Mg,Fe)O、Ca_(2)Fe_(2)O_(5)、Ca 2(Al,Fe)_(2)O_(5),而精炼渣的矿物组成主要为CaO、Ca_(6)Al_(7)O_(16)、Ca_(2)SiO_(4)、FeB。从显微组织形貌分析,观察到转炉渣样以板条状、珊瑚状形貌的硅酸二钙为主体矿相,其余各矿相在渣中无序分布。在精炼渣中,可观察到含玻璃化分层结构,生成的硅酸二钙和钙铝酸盐呈现聚集性分布。结合熔渣结构的理论计算,钢渣的NBO/T值由转炉渣的8.34下降到精炼渣的2.93,解离程度呈现下降趋势。In the long steelmaking process,the slag plays a key role in each stage for the stable and high quality production.The in-depth study of slag forming process has a significant impact on the cost reduction,quality and efficiency improvement as well as resource reuse.In this paper,it was studied the steel slag forming behavior in the BOF-LF process.The results show that after the BOF-LF process,the binary basicity(CaO/SiO_(2))of steel slag rises sharply,while the ternary basicity(CaO/(SiO_(2)+Al_(2)O_(3)))and the total basicity([(CaO)+(MgO)+(MnO)+(FeO)]/[(SiO_(2))+(Al_(2)O_(3))+(P_(2) O_(5))])presents a decreasing trend.From the analysis of the mineral composition,the main mineral phases of the BOF slag are CaO,Ca_(2)SiO_(4),(Mg,Fe)O,Ca_(2)Fe_(2)O_(5),Ca 2(Al,Fe)_(2) O_(5),whereas the LF refining slag mainly contains CaO,Ca_(6)Al_(7)O_(16),Ca_(2)SiO_(4),FeB.On the view of microscopy observation,it can be found that as the main mineral phase,dicalcium silicate has the morphology of lath and coral shape,which is accompanied by other phases disorderly distributing in the slag.In the LF refining slag,it is obvious that the slag has vitrification and stratification structure,and the generated dicalcium silicate as well as calcium aluminate show aggregation distribution.Combined with the theoretical calculation of slag structure,the NBO/T value of steel slag decreases from 8.34 of BOF slag to 2.93 of LF refining slag,which means a downtrend of dissociation degree.

关 键 词：10B21钢 转炉渣 LF精炼渣 渣化行为 

分 类 号：TF4[冶金工程—钢铁冶金]