Abstract The oxidizability characterization method of slag system has a decisive influence on the accuracy of the desulfurization model. By carrying out the balance experiments of melting system composed of CaF2–CaO–Al2O3–SiO2–TiO2–MgO–FeO slag system and Inconel 718 superalloy, the influence of Al2O3 and FeO on desulfurization distribution ratio at 1,773 K was studied. Based on the ion and molecule coexistence theory in slag, the effects of three oxidizability characterization methods, [Fe]–[O] balance, [Al]–[O] balance, and [Fe]–[Al]–[O] balance, on the accuracy of desulfurization thermodynamic model were studied. The results show that the effect of FeO on desulfurization distribution ratio is more significant than that of Al2O3 when the FeO content in slag is greater than 0.014%. When the FeO content in the slag is less than 0.014%, the effect of Al2O3 on the slag oxidizability will be greater than that of FeO. The calculated value of [Fe]–[Al]–[O] balance model is closer to the experimental-measured value compared to [Fe]–[O] balance model and [Al]–[O] balance model alone at 1,923 K.

中文翻译：

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基于高温合金脱硫热力学模型的渣系氧化性表征

摘要 渣系氧化性表征方法对脱硫模型的准确性有决定性影响。通过对CaF2-CaO-Al2O3-SiO2-TiO2-MgO-FeO渣体系和Inconel 718高温合金组成的熔炼体系进行平衡实验，研究了Al2O3和FeO对1773 K脱硫分配比的影响。基于渣中离子分子共存理论，[Fe]-[O]平衡、[Al]-[O]平衡和[Fe]-[Al]-[O]平衡三种氧化性表征方法的影响，对脱硫热力学模型的准确性进行了研究。结果表明，当炉渣中FeO含量大于0.014%时，FeO对脱硫分配比的影响比Al2O3更显着。当炉渣中FeO含量小于0.014%时，Al2O3 对渣氧化性的影响将大于 FeO。[Fe]-[Al]-[O]平衡模型的计算值与[Fe]-[O]平衡模型和单独的[Al]-[O]平衡模型在1,923 K相比更接近实验测量值.