AOD炉渣对MgO-C砖的侵蚀机理研究  

Study on Corrosion Mechanism of AOD Slag on MgO-C Brick

作　　者：周婷[1] 余俊[1] 黄学忠 赵惠忠[1] 谈利强 刘丛平 ZHOU Ting;YU Jun;HUANG Xuezhong;ZHAO Huizhong;TAN Liqiang;LIU Congping(The State Key Laboratory of Refractories and Metallurgy,Wuhan University of Science and Technology,Wuhan 430081,China;Guangxi Beigang New Materials Co.,Ltd.,Beihai 536000,China;Zhejiang Fuziling Special Refractory Co.,Ltd.,Huzhou 313100,China;Zhejiang Hongfeng Charge Co.,Ltd.,Huzhou 313100,China)

机构地区：[1]武汉科技大学省部共建耐火材料与冶金国家重点实验室,武汉430081 [2]广西北港新材料有限公司,北海536000 [3]浙江父子岭特种耐火有限公司,湖州313100 [4]浙江宏丰炉料有限公司,湖州313100

出　　处：《硅酸盐通报》2023年第1期338-344,共7页Bulletin of the Chinese Ceramic Society

基　　金：校企合作基金(2021H20006)。

摘　　要：不锈钢生产主要采用氩氧精炼(AOD)炉冶炼工艺,本文探究AOD炉渣对钢包内衬用MgO-C砖的侵蚀机理,为提高钢包内衬用MgO-C砖的使用性能和服役寿命提供理论支撑。结合FactSage6.2软件、X射线衍射(XRD)、场发射扫描电子显微镜(SEM)和能量色散光谱(EDS)等测试手段分析炉渣侵蚀后MgO-C砖的物相变化、显微结构和化学成分变化。结果表明,随着侵蚀反应的进行,方镁石逐渐被熔蚀,且逐步出现Ca_(3)MgSi_(2)O_(8)等低熔点物相,以及MgAl_(2)O_(4)等高熔点物相。AOD炉渣通过基质部分侵蚀渗透MgO-C砖,并与方镁石反应生成Ca_(3)MgSi_(2)O_(8)等低熔点物相,熔蚀方镁石;同时,方镁石边界处生成MgAl_(2)O_(4),阻碍AOD炉渣对MgO-C砖的侵蚀渗透。The argon oxygen decarburization(AOD)furnace smelting process is widely used in the stainless-steel production.The corrosion mechanism of AOD slag to MgO-C bricks used by ladle lining was studied to provide theoretical basis for improving the service life and performance of MgO-C bricks used by ladle lining.The phase change,microstructure and chemical composition change of MgO-C bricks after corrosion were analyzed by FactSage6.2 software,X-ray diffraction(XRD),field emission scanning electron microscope(SEM)and energy dispersion spectrum(EDS).The results show that,as the corrosion reaction proceeds,periclase is gradually eroded,and the low melting point phases such as Ca_(3)MgSi_(2)O_(8)and the high melting point phases such as MgAl_(2)O_(4)gradually appear.The corrosion is resulted by the penetration of AOD slag through the matrix in the MgO-C bricks,and the reaction between slag and periclase to form Ca_(3)MgSi_(2)O_(8).The generation of MgAl_(2)O_(4)at the boundary of periclase hinders the corrosion of AOD slag to MgO-C bricks.

关 键 词：MGO-C砖 AOD炉渣 侵蚀机理 侵蚀 MgAl_(2)O_(4) Ca_(3)MgSi_(2)O_(8) 

分 类 号：TQ175[化学工程—硅酸盐工业]