Thermodynamic Analysis on Ilmenite Separation by Magnetic Roasting

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.