The fluidity and thermal stability properties of melting slag are closely related to the smooth production of the blast furnace. In this study, the viscosity and thermal stability properties of the chlorine-containing high-titanium melting slag (CaO–SiO₂–MgO–Al₂O₃–TiO₂–CaCl₂) are investigated. The concept of “Extreme Heat Release of Slag” (EHRS) is proposed to quantitatively express the change in the thermal stability of the melting slag. Fourier transform infrared (FTIR) and Raman spectroscopy is used to analyze the structure evolution. The results indicate that chlorine can reduce the viscosity and simplify the structure of melting slag. Due to the evaporation of chlorine at high temperatures, the chlorine content decreases slightly in the viscosity test process. The changing trend of viscous flow activation energy is similar to that of viscosity. Increasing chlorine content could reduce the heat capacity but increase EHRS. The larger the EHRS is, the smaller the viscosity fluctuation. In addition, the [SiO₄]-tetrahedral structures and Ti–O–(Ti or Si) bonds would be destroyed. The relative area fractions of Q² and Q³ units transform to the Q⁰ and Q¹ units, resulting in the decrease in the degree of polymerization of melting slag.

熔渣的流动性和热稳定性能与高炉的顺利生产密切相关。本研究研究了含氯高钛熔渣（CaO-SiO ₂ -MgO-Al ₂ O ₃ -TiO ₂ -CaCl ₂) 进行调查。提出了“渣极热释放”（EHRS）的概念来定量表达熔渣热稳定性的变化。傅里叶变换红外 (FTIR) 和拉曼光谱用于分析结构演化。结果表明，氯可以降低熔渣的粘度，简化熔渣的结构。由于氯在高温下蒸发，在粘度测试过程中氯含量略有下降。粘性流动活化能的变化趋势与粘性相似。增加氯含量会降低热容量，但会增加 EHRS。EHRS 越大，粘度波动越小。此外，[SiO ₄]-四面体结构和 Ti-O-(Ti 或 Si) 键会被破坏。^{Q 2}和Q ³单元的相对面积分数转变为Q ⁰和Q ¹单元，导致熔渣聚合度降低。