炼钢电弧炉渣线用后MgO-C砖的显微结构分析  

Microstructure of used MgO-C bricks in slag line of steelmaking EAF

作　　者：尹振兴[1] 陆强[1] 范鼎东[1] 林娜[2] 张雪松 俞晓东 

机构地区：[1]安徽工业大学冶金工程学院,安徽马鞍山243002 [2]安徽工业大学材料科学与工程学院,安徽马鞍山243002 [3]苏嘉集团新材料有限公司,江苏无锡214151

出　　处：《耐火材料》2015年第3期178-181,共4页Refractories

基　　金：国家自然科学基金面上项目(51471002)

摘　　要：为了研究MgO-C砖在电弧炉实际冶炼条件下的侵蚀机制,采用扫描电镜和能谱仪分析了炼钢电弧炉渣线部位用后MgO-C砖的显微结构。结果显示:用后MgO-C砖可分为渣层、镁砂层、脱碳层、原质层;渣层中有大量类球形颗粒出现,其主要成分是镁浮氏体和钙镁硅酸盐;镁砂层的镁砂颗粒被炉渣由外而内逐渐溶解,或因炉渣不断渗入镁砂颗粒的晶界而解体;在靠近原质层的脱碳层区域,有氧化铁被石墨还原生成的大量铁珠。据此认为,炼钢电弧炉渣线部位MgO-C砖的侵蚀机制为:电炉渣中的氧化铁首先氧化了石墨,然后炉渣不断侵蚀镁砂颗粒,使其溶解或解体形成小颗粒。The microstructure of used MgO-C bricks in EAF slag line was investigated by using SEM-EDS to study the corrosion mechanism.The results show that the used MgO-C bricks can be divided into slag layer,MgO layer,decarburization layer and original layer;there are large quantities of ball-shaped particles in the slag layer,which are composed of magnesiow＆#252;stite and calcium -magnesium silicates;magnesia particles in MgO layer are dissolved by the slag gradually from outside in,or decomposed along with the EAF slag penetration into grain boundaries;FeO is reduced into iron droplet by graphite in decarburization layer close to original layer.The damage mechanism of MgO-C bricks is analyzed to be the oxidation of graphite by FeO in slag followed by dissolution and decomposition of MgO particles under the effect of slag.

关 键 词：炼钢电弧炉 渣线 MGO-C 砖 显微结构 炉渣侵蚀 

分 类 号：TQ175.79[化学工程—硅酸盐工业]