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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。
In order to discuss the possibility of separation of ilmenite from Fe3O4 and TiO2, the oxidation and reduction thermodynamics of ilmenite at low temperature were studied. The results show that oxygen can oxidize FeTiO3 to Fe3O4 by direct magnetization calcination, but it is difficult to control the reaction conditions in the actual operation and easily peroxidize to Fe2O3 and Fe2TiO5. The reaction of FeTiO3 to Fe2O3 and Fe2TiO5 by using CO2 and H2O gas It is easier to generate Fe3O4 instead of generating Fe3O4. Therefore, neither of these two gases can directly magnetize the ilmenite. If indirect magnetization roasting is used, FeTiO3 is first oxidized with oxygen or air, and then no higher concentration of CO is required and a lower The temperature of Fe2O3 and Fe2TiO5 can be reduced to Fe3O4. Based on the above results, a new route of separation of titanium and iron from ilmenite was proposed: iron ore concentrate and titanium slag were obtained by oxidation and magnetization of ilmenite and then by magnetic separation.