中文摘要：

为了探讨钛铁矿以Fe3O4和TiO2分离路线的可能性，对钛铁矿低温下的氧化与还原热力学进行了分析研究。结果表明：若通过直接磁化焙烧的方法，氧气能够将FeTiO3氧化成Fe3O4，但实际操作会难于控制反应条件，易过氧化成Fe2O3和Fe2TiO5；使用CO2和H2O气体将FeTiO3氧化生成Fe2O3和Fe2TiO5的反应更容易发生，而非生成Fe3O4，因此这两种气体也无法直接将钛铁矿磁化；若通过间接磁化焙烧的方法，先用氧气或空气将FeTiO3氧化，而后无需较高浓度的CO以及较低的温度即可以将Fe2O3和Fe2TiO5还原成Fe3O4。根据上述结果，提出钛铁矿分离钛与铁的新路线：将钛铁矿通过氧化和磁化，再通过磁选的方式得到铁精矿粉和钛渣。

英文摘要：

In order to investigate the possibility of separation of Fe3O4 and TiO2 in ilmenite,oxidation and reduction thermodynamics of ilmenite at low temperature is analyzed in this paper.The results show that through direct magnetic roasting,FeTiO3 can be oxidized to Fe3O4,but the reaction is difficult to be controlled,because Fe3O4 tends to be overoxidized to Fe2O3 and Fe2TiO5;in the existence of the CO2 and H2O,FeTiO3 tends to be directly oxidized to Fe2O3 and Fe2TiO5 rather than Fe3O4.Therefore,the ilmenite cannot be directly magnetized by these two kinds of gas.Through indirect magnetic roasting,after oxidation of FeTiO3 with oxygen or air,Fe2O3 and Fe2TiO5 can be reduced to Fe3O4 with a low-concentration CO at low temperature.According to the above results,a new process for separation of iron and titanium in ilmenite is put forward and iron concentrate powder and titanium slag can be obtained through oxidation and magnetization roasting,and then magnetic separation of the ilmenite.