TiO_2-Ti_2O_3-FeO三元渣系黏流特性热力学模拟

Thermodynamic simulation of viscous flow characterisitics of TiO_2-Ti_2O_3-FeO ternary slag

高钛渣在高温下的黏流特性是渣铁分离的关键因素之一。基于Einstein-Roscoe方程,使用FactSage~?软件对TiO_2-Ti2O_3-FeO三元渣系黏度进行热力学模拟,研究温度、FeO含量、还原度和固相颗粒4个因素对其渣系黏度的影响规律。结果表明:该方法能够很好地模拟TiO_2-Ti2O_3-FeO三元渣系黏度的变化规律;FeO含量和还原度的增大均具有降低TiO_2-Ti2O_3-FeO三元渣系熔化温度和黏度的效果;TiO_2-Ti2O_3-FeO三元钛渣完全熔化后,升高温度对渣系黏度的影响较小,黏度值约为110～130mPa·s;当温度低于熔化温度时,TiO_2-Ti2O_3-FeO三元钛渣会析出固相颗粒,析出过程是分阶段进行的,且随着温度的降低,析出量增加,黏度值急剧升高;TiO_2-Ti2O_3-FeO三元钛渣具有较为明显的短渣特性。

The viscous flow characteristics of high titanium slag at high temperature are one of the key factors of slag iron separation.Based on the Einstein-Roscoe equation,thermodynamic simulation of TiO2-Ti2O3-FeO ternary slag viscosity was studied using FactSage software,and the effects of temperature,FeO content,reduction degree and solid particles on the slag viscosity were studied.The results show that the method can simulate the change of the viscosity of TiO2-Ti2O3-FeO ternary slag.The increase of FeO content and reduction degree has the effect of reducing melting temperature and viscosity of TiO2-Ti2O3-FeO ternary slag.After the TiO2-Ti2O3-FeO ternary titanium slag is completely melted,the increase of temperature has little effect on slag viscosity,and the viscosity is about 110-130 mPa·s.When the temperature is lower than melting temperature,TiO2-Ti2O3-FeO ternary titanium slag will precipitate solid particles,and the precipitation process is carried out in stages,and with the decrease of temperature,the precipitation will increase and the viscosity will sharply increase.TiO2-Ti2O3-FeO ternary titanium slag has obvious short slag characteristics.