CaO-SiO2-Fe2O3-Al2O3渣系对高磷铁水脱磷行为的影响  

Effect of CaO-SiO2-Fe2O3-Al2O3 Slag System on Dephosphorization Behavior of High Phosphorus Hot Metal

作　　者：李杰 梁鹏 王志 夏云进 万勇 陈良军 LI Jie;LIANG Peng;WANG Zhi;XIA Yunjin;WAN Yong;CHEN Liangjun(School of Metallurgical Engineering,Anhui University of Technology,Ma’anshan 243032,China)

机构地区：[1]安徽工业大学冶金工程学院

出　　处：《安徽工业大学学报（自然科学版）》2019年第3期206-211,共6页Journal of Anhui University of Technology（Natural Science）

基　　金：国家自然科学基金委员会-中国宝武钢铁集团有限公司钢铁联合研究基金资助(U1660116,U1560109,U1960110);安徽省自然科学基金项目(1308085ME62)

摘　　要：以w(P)=0.48%的高磷铁水为研究对象,采用高温热态实验研究1400℃时CaO-SiO2-Al2O3-Fe2O3渣系的脱磷行为,分析碱度、渣中Fe2O3与Al2O3含量对CaO-SiO2-Al2O3-Fe2O3渣系脱磷的影响。结果表明:随着碱度逐渐增大,渣系脱磷率呈先逐渐增大后略有降低的变化趋势,主要是由于自由O^2-和Ca^2+的引入促进了磷氧络离子PO4^3-及Ca^2+-PO4^3-弱离子对的进一步生成;随着Fe2O3含量的增加,渣系脱磷率逐渐升高,渣中的Fe2O3加速了氧化钙的熔化速度,同时使渣系的氧化性提高,进而使渣系脱磷能力提高;w(Al2O3)=1%~3%时,渣系脱磷率维持在77%左右,进一步增大渣中Al2O3含量,渣系脱磷率逐渐下降,主要原因在于Al2O3改变了渣中液相比例,进而影响了脱磷反应物与产物在渣-金间的传质过程。Taking high phosphorus hot metal with w(P)=0.48%as the research object,dephoshporization behavior of CaO-SiO2-Al2O3-Fe2O3 slag system at 1400℃was studied by high temperature hot state test.The effect of basicity,Fe2O3 and Al2O3 content on the dephosphorization of CaO-SiO2-Al2O3-Fe2O3 slag system was investigated.The results show that with the increasing of slag basicity,the dephosphorization rate of slag system increases at first and then decreases slightly,mainly because the introduction of O^2-and Ca^2+promotes the formation of PO4^3-complex ion and Ca^2+-PO4^3-weak ion pair.With the increase of Fe2O3 content,the dephosphorization rate of slag system increases gradually.Fe2O3 in slag accelerates the melting rate of CaO,and improves the oxidation of slag system,thus improving the dephosphorization ability of slag system.When the w(Al2O3)is 1%-3%,the dephosphorization rate of slag system maintains at about 77%.With the further increased of Al2O3,the dephosphorization rate of slag system decreases gradually.The main reason is that Al2O3 changes the proportion of liquid phase in the slag,and then affects the mass transfer process of dephosphorization reactants and products between slag and molten.

关 键 词：高磷铁水 CaO-SiO2-Al2O3-Fe2O3渣系 脱磷 

分 类 号：TF704.4[冶金工程—钢铁冶金]