Numerous challenges persist in the smelting of vanadium–titanium magnetite using the blast furnace process. These challenges can be overcome by adopting the HIsmelt process, without the need for additional ore or enhanced slag operations. In this study, the effects of basicity and the MgO/Al2O3 ratio on slag viscosity and crystallization behavior are investigated through thermodynamic calculations and experiments. In the results, a decrease in slag viscosity with an increase in basicity and MgO/Al2O3 ratio is demonstrated. Notably, MgO/Al2O3 ratios have a minor impact on the viscosity and break temperature of the slag. With a TiO2 content of 40 wt% in the slag, perovskite phases are identified as the main equilibrium solid precipitates during the crystallization process under various basicity and MgO/Al2O3 ratios. As the slag temperature decreases further, the liquid phase content in the slag progressively decreases, reaching complete crystallization at 1159.0 °C. For industrial production, it is advisable to maintain the binary basicity of the slag within the range of 1.0–1.1, with the MgO/Al2O3 ratio around 0.6. Herein, the research findings contribute to a deeper understanding of the viscosity and crystallization behavior of HIsmelt titanium‐containing slag.

中文翻译：

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碱度和MgO/Al2O3比对HIsmelt含钛渣粘度和结晶行为的影响

使用高炉工艺冶炼钒钛磁铁矿仍然存在许多挑战。这些挑战可以通过采用 HIsmelt 工艺来克服，无需额外的矿石或强化炉渣操作。在这项研究中，碱度和 MgO/Al 的影响2氧3通过热力学计算和实验研究了比例对炉渣粘度和结晶行为的影响。结果表明，随着碱度和 MgO/Al 的增加，炉渣粘度降低2氧3比率被证明。值得注意的是，MgO/Al2氧3比例对炉渣的粘度和破裂温度影响较小。与二氧化钛2渣中含量为 40 wt% 的钙钛矿相被确定为在不同碱度和 MgO/Al 条件下结晶过程中的主要平衡固体析出物2氧3比率。随着渣温进一步降低，渣中液相含量逐渐减少，在1159.0℃时达到完全结晶。对于工业生产，建议保持炉渣的二元碱度在1.0~1.1范围内，MgO/Al2氧3比率在0.6左右。在此，研究结果有助于更深入地了解HIsmelt含钛渣的粘度和结晶行为。