石灰在气化脱磷渣中熔解时渣中离子迁移行为研究  

Study on ion migration behavior of lime in dissolution of gasification dephosphorization slag

作　　者：佟帅 王书桓 李晨晓 薛月凯 张凯璇 孙华康 TONG Shuai;WANG Shuhuan;LI Chenxiao;XUE Yuekai;ZHANG Kaixuan;SUN Huakang(Metallurgy and Energy College,North China University of Science and Technology,Tangshan 063009,China;Tangshan Key Laboratory of Special Metallurgy and Material Manufacture,Tangshan 063009,China)

机构地区：[1]华北理工大学冶金与能源学院,河北唐山063009 [2]唐山市特种冶金及材料制备重点实验室,河北唐山063009

出　　处：《炼钢》2022年第2期25-31,共7页Steelmaking

基　　金：国家自然科学基金资助项目(52004097);河北省自然科学基金资助项目(E2019209597)。

摘　　要：针对转炉气化脱磷渣渣系,研究了静态石灰在熔渣中熔解动力学。研究结果表明,在1200~1500℃内,随着温度的升高,石灰熔解速度增大。石灰熔解的表观活化能为E_(a)=203.1 kJ/mol,拟合反应速率常数与温度关系的直线方程为ln v_(r)=-24.43/T-14.62,其石灰熔解的限制性环节为扩散控制。通过扫描电镜(SEM)和X射线衍射(XRD)对熔渣层-交界层-石灰层进行离子迁移分析,研究结果表明,由石灰表层向内部深入,熔渣组元Fe_(2)+的迁移速率比SiO_(4)^(4-)的迁移速率快,在石灰表层主要生成CaO-SiO_(2)复合相,内部会存在更多的Fe元素,形成主要的CaO-FeO复合相。For converter gasification dephosphorization slag system,the kinetics of static lime dissolution in slag was studied.The research results show that in the temperature range of 1200~1500℃,as the temperature increases,the melting rate of lime increases,the activation energy of lime melting is E_(a)=203.1 kJ/mol,the linear equation fitting the relationship between the rate constant and the temperature is ln v_(r)=-24.43/T-14.62.The limiting link of lime melting is diffusion control.Analyzed by scanning electron microscope(SEM)and X-ray diffraction(XRD)the molten slag layer-the boundary layer-the lime layer,the research results show that the migration rate of the slag component Fe_(2)+is faster than the migration rate of SiO_(4)^(4-),from the lime surface to the inside,CaO-SiO_(2) composite phase is mainly formed on the lime surface,and more Fe elements will be present inside,forming the main CaO-FeO composite phase.

关 键 词：气化脱磷渣 石灰 熔解 扩散 活化能 

分 类 号：TF713.3[冶金工程—钢铁冶金]