AOD炉渣对MgO-C砖的侵蚀机理研究

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Ca3MgSi2O8等低熔点物相, 以及MgAl2O4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Ca3MgSi2O8等低熔点物相, 熔蚀方镁石; 同时, 方镁石边界处生成MgAl2O4, 阻碍AOD炉渣对MgO-C砖的侵蚀渗透。

Abstract

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 Ca3MgSi2O8 and the high melting point phases such as MgAl2O4 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 Ca3MgSi2O8. The generation of MgAl2O4 at the boundary of periclase hinders the corrosion of AOD slag to MgO-C bricks.

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周婷, 余俊, 黄学忠, 赵惠忠, 谈利强, 刘丛平. AOD炉渣对MgO-C砖的侵蚀机理研究[J]. 硅酸盐通报, 2023, 42(1): 338. ZHOU Ting, YU Jun, HUANG Xuezhong, ZHAO Huizhong, TAN Liqiang, LIU Congping. Study on Corrosion Mechanism of AOD Slag on MgO-C Brick[J]. Bulletin of the Chinese Ceramic Society, 2023, 42(1): 338.

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