钛磁铁矿直接还原—磁选钛铁分离主要影响因素探析

从钛磁铁矿还原历程和焙烧方式、还原条件、磨选条件对钛磁铁矿直接还原—磁选钛铁分离的影响等4个方面分析总结了钛磁铁矿直接还原—磁选技术的研究进展。在直接还原过程中,钛磁铁矿的还原历程为Fe_2.75Ti_0.75O₄→Fe₂TiO₅→Fe₂TiO₄→Fe TiO₃→Fe Ti₂O₅→Ti₂O₃;从现阶段看,钛磁铁矿直接还原常用的焙烧方式主要有内配法和包埋法,其中内配法还原温度低、还原时间短、还原剂用量低,成本低且钛铁分离效果更好,包埋法所得富钛产品中TiO₂品位高,有利于钛资源回收利用;还原剂、还原温度、还原时间和添加剂均对钛铁分离效果有影响,适宜的还原条件有利于钛铁矿物的还原和金属铁颗粒的聚集长大,从而促进钛铁分离;磨矿细度和磁场强度也对钛铁分离效果有影响,磨矿细度不宜过粗/过细,磁场强度不宜过大/过小。通过...

Analysis on the Main Influencing Factors for Titanium and Iron Separation Using Direct Reduction and Magnetic Separation Treating Titanomagnetite

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.