TiO2对含钛高炉初渣物相转变与黏度的影响

为了研究含钛高炉初渣的形成过程和各种物相成分相互作用、迁移重组的过程，明晰TiO2对高炉初渣形成的影响规律，利用FactSage热力学软件及旋转柱体式黏度仪研究了TiO2质量分数对高炉初渣熔化温度、物相转变行为以及初渣黏度的影响。结果表明，随着初渣中TiO2质量分数的增加，含钛高炉初渣熔化温度升高，TiO2质量分数从4%增加到16%，其熔化温度从1 360升高到1 410 ℃，增加了50 ℃；含钛高炉初渣中TiO2质量分数对初渣中各种物相组成的转变和比例都有较大的影响，随着TiO2质量分数的增加，初渣固液相共存的温度区间变大，使高炉软融带变宽；TiO2对含钛高炉初渣黏度的影响相对较为复杂，当TiO2质量分数为4%～8%时，含钛高炉初渣黏度 温度曲线呈现出“碱性渣”的形态；当TiO2质量分数为16%时，含钛高炉初渣黏度 温度曲线呈现出“酸性渣”的形态。

Effect of TiO2 on phase transition and viscosity of Ti bearing primary slag in blast furnace

Effect of TiO2 on the formation of blast furnace slag was clarified in order to study the formation process of the primary slag containing titanium in blast furnace, the interaction, migration and recombination of various phase components of Ti bearing primary slag in blast furnace. FactSage thermodynamics software and rotating cylinder viscometer were applied to study the effect of TiO2 mass fraction on melting temperature, phase transition and viscosity of the primary slag in blast furnace. The results showed that with the increase of TiO2 mass fraction in primary slag (from 4% to 16%), the melting temperature increased from 1 360 to 1 410 ℃, increased by 50 ℃. The mass fraction of TiO2 in the Ti bearing primary slag in blast furnace had a great influence on the transformation and proportion of all kinds of phase compositions in the primary slag. The temperature range of the solid liquid phase coexistence of the primary slag became larger with the increase of TiO2 mass fraction, which would widen the soft zone of blast furnace. The effect of TiO2 mass fraction on the primary slag viscosity was complex. When TiO2 mass fraction was in the range of 4% 8%, the viscosity temperature curve presented as "alkaline slag". When TiO2 mass fraction was 16%, the viscosity temperature curve of the primary slag appeared as "acidic slag".