关键词: 钛磁铁矿, 直接还原—磁选, 钛铁分离, 综合利用

Abstract: The progress of direct reduction and magnetic separation of titanomagnetite was summarized from four aspects:reduction process of titanomagnetite,effects of roasting method,reduction condition and grinding condition on the separation of Ti and Fe.The reduction sequence of titanomagnetite in the direct reduction is Fe_2.75Ti_0.75O₄→Fe₂TiO₅→Fe₂TiO₄→FeTiO₃→FeTi₂O₅→Ti₂O₃.From the present stage,the commonly used roasting methods mainly include blending and embedding method.Among them,blending has the characteristics of low reduction temperature,short reduction time,low reducing agent dosage,low cost and better separation effect of Ti and Fe.However,TiO₂ grade in titanium-rich products obtained by embedding method is high,which is conducive to the recovery and utilization of titanium resources in titanomagnetite.In the direct reduction process of titanomagnetite,reduction conditions,such as reducing agent,reduction temperature,reduction time and additives,have effects on the separation of Ti and Fe.The appropriate reduction conditions are conducive to the reduction of titanomagnetite and the aggregation and growth of iron particles,so as to promote the separation of Ti and Fe.Grinding fineness and magnetic field strength also affect the separation effect of Ti and Fe.Grinding fineness should not be too coarse/too fine,and magnetic field strength should not be too large/too small.Through analysis and comparison,it can be seen that in-depth study of reduction process of titanomagnetite and strengthening separation of Ti and Fe are of great significance to the comprehensive utilization of titanium and iron resources in it.Finally,the main direction of the development and progress of the separation Ti and Fe of titanomagnetite by direct reduction and magnetic separation was pointed out.

Key words: titanomagnetite,direct reduction and magnetic separation,separation of Ti and Fe,comprehensive utilization