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Effect of Chlorine on the Fluidity and Thermal Stability Properties of High-Titanium Slags

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Abstract

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.

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Acknowledgment

The present work was financially supported by the Natural Science Basic foundation of China (Program No. 52174325) and China Postdoctoral Science Found (Grant No. 2019M663932XB). The authors gratefully acknowledge their support.

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On behalf of all authors, the corresponding author states that there is no conflict of interest.

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Authors and Affiliations

  1. School of Metallurgical Engineering, Xi’an University of Architecture and Technology, Xi’an, 710055, P.R. China

    Jianlu Zheng, Xiangdong Xing & Ming Lv

  2. Metallurgical Engineering Technology Research Center of Shaanxi Province, Xi’an, 710055, P.R. China

    Jianlu Zheng, Xiangdong Xing & Ming Lv

  3. Shaanxi Steel Group Hanzhong Iron and Steel Co., Ltd, Hanzhong, 724207, P.R. China

    Jinke Li & Tao Li

  4. Shaanxi Institute for Food and Drug Control, Xi’an, 710065, P.R. China

    Sunxuan Wang

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  1. Jianlu Zheng
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Correspondence to Xiangdong Xing or Ming Lv.

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Zheng, J., Xing, X., Li, J. et al. Effect of Chlorine on the Fluidity and Thermal Stability Properties of High-Titanium Slags. Metall Mater Trans B 53, 2942–2952 (2022). https://doi.org/10.1007/s11663-022-02577-4

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