电炉冶炼高镁酸溶钛渣的热力学及试验研究

电炉冶炼钛铁矿制备酸溶渣时,为降低冶炼温度、保障渣的流动性,高钛渣中通常保留一定数量的氧化亚铁,导致后续钛白粉生产中产生硫酸亚铁,造成酸耗高等不利影响.针对上述问题,通过采用FactSage热力学分析结合电炉冶炼试验,研究了氧化镁对高钛渣物化性质影响规律及其降低炉渣冶炼温度的可行性.结果表明,提高氧化镁含量、降低氧化亚...

Thermodynamic and experimental study on electric furnace smelting high-magnesium acid-soluble titanium slag

An amount of FeO is usually retained in the high titanium slag during the electric furnace smelting of ilmenite for reducing the smelting temperature and keeping the slag fluidity. However, ferric sulfate formed during the production of titanium dioxide by the sulfuric acid method, resulting in the harmful effects such as high acid consumption. The effects of MgO on the physicochemical properties of high titanium slag were analyzed. Moreover, the feasibility of reducing the melting temperature of slag was investigated by FactSage thermodynamic analysis combined with electric furnace smelting experiments. The results show that increasing the MgO content and decreasing the FeO content have no apparent effect on the viscosity of titanium slag but can reduce the melting temperature. Besides, an increase of MgO in titanium slag is beneficial to mitigate the reduction of titanium oxides. Furthermore, with the increase of MgO content, the proportion of MgTi2O5 in anosovite solid solution increases. The results of the electric furnace smelting experiments confirmed that increasing MgO content from 6.6 wt% to 12.4 wt% can reduce the smelting temperature by 50℃. The main phase of the titanium slag is magnesium rich anosovite which has a good acidolysis performance. Therefore, it is beneficial to the subsequent production of titanium dioxide by the sulfuric acid process.