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 influ-ence 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 vana-dium titanomagnetite under BF smelting.

Zhengde Pang;Yuyang Jiang;Jiawei Ling;Xuewei Lü;Zhiming Yan

Chongqing Key Laboratory of Vanadium-Titanium Metallurgy and New Materials,Chongqing University,Chongqing 400044,China;College of Materials Science and Engineering,Chongqing University,Chongqing 400044,China;WMG,University of Warwick,Coventry,CV47AL,UK

矿物冶金与材料学报

[1]Zhengde Pang;Yuyang Jiang;Jiawei Ling;Xuewei Lü;Zhiming Yan-.Blast furnace ironmaking process with super high TiO2 in the slag: Density and surface tension of the slag)[J].矿物冶金与材料学报,2022(06):1170-1178

vana

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