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

Abstract

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.

Key words: MgO-C brick, AOD slag, corrosion mechanism, corrosion, MgAl₂O₄, Ca₃MgSi₂O₈

CLC Number:

TQ175

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): 338-344.

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