To increase the utilization fraction of vanadium titano-magnetite in the blast furnace burden to > 80 pct, a new slag zone with high MgO was found. The effect of the TiO2 content and MgO/CaO mass ratio on the viscosity and liquidus temperature of the high TiO2-bearing blast furnace slag was investigated in the present work. The results indicated that at a fixed CaO/SiO2 ratio of 1.1, the viscosity decreases with increasing TiO2 content at a range of 20 to 34 mass pct. Conversely, increasing the MgO/CaO ratio from 0.32 to 0.65 causes a slight increase in the slag viscosity. The activation energy may show a concomitant variation corresponding to the viscosity of slag. The liquidus temperature first increases and then slightly decreases with TiO2 content. However, the liquidus temperature first decreases and then increases with the MgO/CaO ratio, similar to the variation of the thermodynamic calculation using FactSage software. Various viscosity models were employed to predict the viscosity, and Yan’s model was found to be the most reliable in predicting the viscosity in the present study. In addition, the iso-viscosity distribution diagram was obtained using Yan’s model calculation. It may have potential for application in the blast furnace ironmaking process with super-high (> 80 pct) vanadium titano-magnetite. A suitable slag composition was found to satisfy the smelting process in a blast furnace with super-high TiO2 content at low temperature by using more MgO and less CaO content.

中文翻译：

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炉渣中含超高 TiO2 的高炉炼铁工艺：炉渣的粘度和熔化特性

为了将高炉炉料中钒钛磁铁矿的利用率提高到 > 80 pct，发现了一个新的高 MgO 渣区。在目前的工作中，研究了 TiO2 含量和 MgO/CaO 质量比对高含 TiO2 高炉渣的粘度和液相线温度的影响。结果表明，在固定的 CaO/SiO2 比率为 1.1 时，粘度随着 TiO2 含量的增加而降低，范围为 20 至 34 质量 pct。相反，将 MgO/CaO 比从 0.32 增加到 0.65 会导致炉渣粘度略有增加。活化能可显示出对应于炉渣粘度的伴随变化。随着TiO2含量的增加，液相线温度先升高后略有降低。然而，液相线温度随着 MgO/CaO 比的增加先降低后升高，类似于使用 FactSage 软件进行热力学计算的变化。使用各种粘度模型来预测粘度，在本研究中发现 Yan 模型是预测粘度最可靠的模型。此外，使用Yan的模型计算获得了等粘度分布图。它可能具有在高炉炼铁工艺中应用超高（> 80 pct）钒钛磁铁矿的潜力。通过使用较多的MgO和较少的CaO含量，发现合适的炉渣成分满足低温下超高TiO2含量的高炉熔炼过程。在本研究中，Yan 模型被认为是预测粘度最可靠的模型。此外，使用Yan的模型计算获得了等粘度分布图。它可能具有在高炉炼铁工艺中应用超高（> 80 pct）钒钛磁铁矿的潜力。通过使用较多的MgO和较少的CaO含量，发现合适的炉渣成分满足低温下超高TiO2含量的高炉熔炼过程。在本研究中，Yan 模型被认为是预测粘度最可靠的模型。此外，使用Yan的模型计算获得了等粘度分布图。它可能具有在高炉炼铁工艺中应用超高（> 80 pct）钒钛磁铁矿的潜力。通过使用较多的MgO和较少的CaO含量，发现合适的炉渣成分满足低温下超高TiO2含量的高炉熔炼过程。