CaO-SiO_2-FeO-MgO体系钢渣的氧化改质动力学研究（英文）  

Kinetics of the Oxidation Modification Process of CaO-SiO_2-FeO-MgO Slag

作　　者：蒋亮[1,2] 包亦望[2] 陈宇红[1] Yang Qixing[1,3] 薛同 刘贵群[1] 韩凤兰 JIANG Liang;BAO Yiwang;CHEN Yuhong;XUE Tong;LIU Guiqun;HAN Fenglan(School of Material Science and Engineering,North Minzu University,Yinchuan 750021;China Building Material Academy,Key State Laboratory of Green Building Materials,Beijing 100024)

机构地区：[1]北方民族大学材料科学与工程学院,银川750021 [2]中国建筑材料科学研究总院绿色建材重点实验室,北京100024 [3]Minerals and Metallurgical Engineering,Department of Civil,Environmental and Natural Resources Engineering,Lule University of Technology

出　　处：《材料导报》2018年第4期650-656,671,共8页Materials Reports

基　　金：The Project 5 of Sweden CAMM2(Centre of Advanced Mining and Metallurgy)Work Package 4,WP4(1563365);宁夏国际合作项目(Grant No.2013ZYH187);宁夏科技支撑项目(2014ZYH50)

摘　　要：通过高温煅烧的方式对工业BOF钢渣进行氧化改质。借助热力学分析,利用XRD、SEM-EDS和湿式磁选对改质前后钢渣矿物相进行研究,证实了氧化改质后钢渣中无磁性氧化亚铁向磁性尖晶石相转变并可通过湿式磁选选出,氧化改质最佳温度为1 100℃。对CaO-SiO_2-FeO-MgO体系钢渣的氧化进行进一步热力学和动力学分析,并与文献中已有CaO-SiO_2-FeO体系钢渣研究进行对比。结果表明,成分中镁的添加有益于磁性尖晶石相在空气中生成。钢渣的氧化过程可以被分为三个阶段:初始阶段、化学反应阶段和扩散阶段。An investigation of mineralogical phases in industrial slag transferred from non-magnetic to magnetic substances was carried out in this study,aiming at extraction of superfluous wustite and stabilization of free lime and free periclase.X-ray diffraction(XRD),scanning electron microscopy(SEM)and energy dispersive spectroscopy(EDS)were employed to investigate the mineralogy and phase distribution.Wet magnetic separation was conducted to determine the recovery rate of iron.The thermodynamic and kine-tic calculations for the oxidation of steel slag in a CaO-SiO 2-FeO-MgO system were also performed,and the results were compared with a CaO-SiO 2-FeO system.XRD analysis and SEM-EDS observation confirmed the conversion from non-magnetic wustite to magnetite spinel(magnetite/magnesioferrite)after oxidation.Magnetic separation experiment indicated that the optimal oxidation temperature is 1 100℃,which coincided well with the thermodynamic calculations.The addition of periclase had a significant influence on the formation of spinel and leaded to the presence of spinel under a partial pressure of oxygen range log 10(P O 2)=4.3(correspon-ding to air).The oxidation process of steel slag could be divided into three steps:initial incubation,chemical reaction and diffusion.

关 键 词：尖晶石 钢渣 氧化 热力学 动力学 

分 类 号：TF4[冶金工程—钢铁冶金]