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Blast furnace ironmaking process with super high TiO2 in the slag: Density and surface tension of the slag

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Abstract

Aiming at the process of smelting ultra-high (>80%) or even full vanadium titanomagnetite in blast furnace, we are conducting a series of works on physics character of high TiO2 bearing blast furnace slag (BFS) for slag optimization. This work discussed the density and surface tension of high TiO2 bearing BFS using the Archimedean principle and the maximum bubble pressure method, respectively. The influence of TiO2 content and the MgO/CaO mass ratio on the density and surface tension of CaO-SiO2-TiO2-MgO-Al2O3 slags were investigated. Results indicated that the density of slags decreased with the TiO2 content increasing from 20wt% to 30wt%, but it increased slightly with the MgO/CaO mass ratio increasing from 0.32 to 0.73. In view of silicate network structure, the density and the degree of polymerization (DOP) of network structure have a consistent trend. The addition of TiO2 reduced (Q3)2/(Q2) ratio (Q2 and Q3 represent structural unit with bridge oxygen number of 2 and 3, respectively) and then decreased DOP, which led to the decrease of slag density. The surface tension of CaO-SiO2-TiO2-MgO-Al2O3 slags decreased dramatically with the TiO2 content increasing from 20wt% to 30wt%. Conversely, it increased with the MgO/CaO mass ratio increasing from 0.32 to 0.73. Furthermore, the iso-surface tension lines were obtained under 1723 K using the Tanaka developed model in view of Butler formula. It may be useful for slag optimization of ultra-high proportion (>80%) or even full vanadium titanomagnetite under BF smelting.

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Acknowledgements

This work was financially supported by the National Key R&D Program of China (No. 2018YFC1900500) and the Key Fund of Natural Science (No. 51974048).

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Authors and Affiliations

  1. Chongqing Key Laboratory of Vanadium-Titanium Metallurgy and New Materials, Chongqing University, Chongqing, 400044, China

    Zhengde Pang, Yuyang Jiang, Jiawei Ling & Xuewei Lü

  2. College of Materials Science and Engineering, Chongqing University, Chongqing, 400044, China

    Zhengde Pang, Yuyang Jiang, Jiawei Ling & Xuewei Lü

  3. WMG, University of Warwick, Coventry, CV4 7AL, UK

    Zhiming Yan

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  1. Zhengde Pang
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Correspondence to Xuewei Lü or Zhiming Yan.

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Pang, Z., Jiang, Y., Ling, J. et al. Blast furnace ironmaking process with super high TiO2 in the slag: Density and surface tension of the slag. Int J Miner Metall Mater 29, 1170–1178 (2022). https://doi.org/10.1007/s12613-021-2262-x

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