The slag resistance of ladle lining refractory in different atmospheric conditions is of utmost importance due to the strong variation of atmospheric environment in ladle during the process cycle. In this study, by adopting dynamic induction furnace corrosion test, the corrosion mechanism of lightweight Al2O3–MgO castable with different environmental oxygen partial pressure was investigated through macro and microanalysis, XRD, and thermodynamic simulation. The atmospheric condition was set to P (O2) = 0.21 atm or P(Ar) = 1.0 atm. The attained results showed that a reduced slag corrosion but intensified slag penetration happened at low environmental oxygen partial pressure condition. With P(O2) = 0.21 atm, Mn and Fe in slag were present in the form of divalent and/or trivalent cations and were incorporated into spinel to form MnFe2O4 solutions and MgAl2O4 solutions during the corrosion process. Since Fe, Mn ions were largely consumed, liquid with high viscosity formed and the continuing infiltration was suppressed. Under P(Ar) = 1.0 atm, Fe ions in the slag were totally reduced into elemental iron while Mn existed mainly in the state of MnO, and the amount of liquid slag was therefore reduced, leading to significantly weakened corrosion on castable aggregates. Corrosion reaction products under this condition were mainly MgAl2O4 and CA6.

中文翻译：

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不同大气条件下轻质Al2O3-MgO浇注料的熔渣腐蚀机理

由于在工艺周期中钢包内大气环境的强烈变化，钢包内衬耐火材料在不同大气条件下的抗渣性至关重要。本研究采用动态感应炉腐蚀试验，通过宏观和微观分析、XRD、热力学模拟等手段，研究了不同环境氧分压下轻质Al2O3-MgO浇注料的腐蚀机理。大气条件设置为 P (O2) = 0.21 atm 或 P(Ar) = 1.0 atm。所得结果表明，在低环境氧分压条件下，熔渣腐蚀减少但熔渣渗透增强。当 P(O2) = 0.21 atm 时，炉渣中的 Mn 和 Fe 以二价和/或三价阳离子的形式存在，并在腐蚀过程中结合到尖晶石中形成 MnFe2O4 溶液和 MgAl2O4 溶液。由于Fe、Mn离子大量消耗，形成高粘度液体，抑制了继续渗透。在 P(Ar) = 1.0 atm 条件下，渣中的 Fe 离子完全还原为元素铁，而 Mn 主要以 MnO 的状态存在，因此液态渣量减少，对浇注料集料的腐蚀显着减弱。该条件下腐蚀反应产物主要为MgAl2O4和CA6。渣中的Fe离子全部还原为元素铁，而Mn主要以MnO的状态存在，因此液态渣量减少，对浇注料骨料的腐蚀显着减弱。该条件下腐蚀反应产物主要为MgAl2O4和CA6。渣中的Fe离子全部还原为元素铁，而Mn主要以MnO的状态存在，因此液态渣量减少，对浇注料骨料的腐蚀显着减弱。该条件下腐蚀反应产物主要为MgAl2O4和CA6。