钛精矿重选分离含硅物相影响因素研究

Influencing Factors of Si Phase Separation from Ilmenite by Gravity Concentration Method

针对四川某钛精矿中存在的硅含量过高的问题,提出了摇床重选法分离二氧化硅的方法。通过球磨工艺获得不同粒径颗粒,然后采用摇床进行重选,研究粒径大小、粒径组分占比、冲程等因素对钛精矿含硅相的分离效果。结果表明,随着磨矿时间的增加,-200目(<75μm)钛精矿占比逐渐增加。当研磨时间为8 min时,-200目钛精矿的占比为83.0%(质量分数)。随着冲程的增大,SiO_(2)的品位和TiO_(2)的回收率均呈逐渐增大的趋势。当冲程为15 mm时,SiO_(2)的品位由2.46%(质量分数)降低至1.07%。重选分离后原矿分为三部分,TiO_(2)品位:钛精矿>中矿>尾矿,SiO_(2)品位:钛精矿<中矿<尾矿。当-200目铁精矿占比85.5%(质量分数)时,重选后SiO_(2)的含量最低可降至0.93%(质量分数)。

High content of Si phase is a critical problem in the ilmenite for the upgrade of titanium slag from Sichuan.The gravity concentration method was proposed to separate the SiO_(2)phase from the ilmenite.Particles with different size were prepared by ball milling process,then the particles were treated by heavy machine.The separation effects of different factors(such as particle size,particle proportion and stroke)on the Si phase from ilmenite were investigated.These results indicate that the proportion of particles with less than-200 mesh(<75μm)increases with the grinding time extension.When the grinding time is 8 min,the proportion of particles with less than-200 mesh reaches 83.0%(mass fraction).With the increasing of the stroke,the content of SiO_(2) and the recovery rate of TiO_(2) increase.When the stroke is 15 mm,the content of SiO_(2) decreases to 1.07%(mass fraction) from 2.46%.Three different parties are divided after gravity concentration treatment,the content relation of TiO_(2) is ilmenite>middling product>tailing,and the content relation of SiO_(2) is ilmenite<middling product<tailing.The minimum content of SiO_(2) reaches 0.93%(mass fraction)when the proportion of particles with less than-200 mesh is 85.5%(mass fraction).