转炉钢渣对镁质耐火材料的侵蚀过程  

Erosion process of magnesia refractory by converter steel slag

作　　者：邓志豪[1] 董元篪[2] 李小虎[3] 王珏[2] 吴六顺[2] 

机构地区：[1]北京科技大学冶金与生态工程学院,北京100083 [2]安徽工业大学冶金与资源学院,安徽马鞍山243002 [3]马鞍山钢铁股份有限公司特钢公司,安徽马鞍山243002

出　　处：《炼钢》2013年第6期60-65,共6页Steelmaking

基　　金：国家自然科学基金国际合作项目(50920105403)

摘　　要：以CaO-MgO-SiO2-Fe2O3-P2O5为试验渣,采用静态法研究此渣系在碱度变化时对高纯氧化镁坩埚的侵蚀行为,使用扫描电镜(SEM)、能谱分析(EDS)等方法对侵蚀区域和熔渣的微观结构进行研究,结果表明:1 600℃时,不同碱度的熔渣结构不同,R>2.5时,若w(FeO)/w(Fe2O3)值高,FeO渗入MgO层形成具有良好耐火度的(Mg、Fe)O;若w(FeO)/w(Fe2O3)值低,优势存在的2CaO·Fe2O3与微量杂质Al2O3在MgO晶界处反应形成液相4CaO·Al2O3·Fe2O3,促进熔渣不断沿晶界进入MgO层,加速渣蚀过程。R<2.5时,MgO不断溶入熔渣形成MgO·Fe2O3和CaMgSiO4(CMS),直至熔体MgO浓度饱和。在R=1时,试验渣w(MgO)可达18.23%,表明耐火材料侵蚀严重。Penetration and corrosion resistance of high purity MgO crucible by CaO- MgO-SiO2-Fe2 O3-P2O5 slag with different basicity at 1 600℃ were investigated by SEM, EDS, XRD and XRF analysis. At the test temperature, when w（CaO）/w（SiO2 ） 2. 5,Fe ions from slag diffused into the magnesia grain to form （Mg、Fe） O with high melting point, whereas another kind of minerals iron-containing 2CaO. Fe2O3 in molten slag would react with trace impurities Al2O3 located in the MgO grain interface to form 4CaO.Al2O3·Fe2O3 with low refractoriness, rompting silica rich local liquid dissolved into MgO grain. When w（CaO）/w（SiO2）〈2. 5, experimental slag were not saturated with respect to MgO, so the MgO continually dissolved into molten slag until saturation state. Meanwhile, the slag mainly mineral phase were MgO. Fe2O3 and CaMgSiO4. In this experiment, under 1 600℃ for 30 rain, MgO concentration of slag （w（CaO）/ w（SiO2） = 1） reached 18. 23 %. It was suggested that crucible was seriously erosion.

关 键 词：转炉钢渣 耐火材料 碱度 侵蚀 

分 类 号：TQ175[化学工程—硅酸盐工业]