内蒙古某微细嵌布贫赤铁矿石选矿工艺研究

摘要

为了给内蒙古某微细嵌布贫赤铁矿石的开发利用提供技术依据,采用强磁选—反浮选工艺、强磁选—正浮选工艺和深度还原—弱磁选工艺对该矿石进行了选矿试验.结果表明:强磁选—浮选工艺无法实现有效分选,而深度还原—弱磁选工艺在煤用量为30％、助还原剂CCO用量为15％、焙烧温度为1200℃、焙烧时间为90min的条件下,可以得到铁品位为91.44％、回收率为91.22％的铁精矿.通过X射线衍射和扫描电镜探讨了还原剂CCO的作用机制,发现CCO可以加速体系中的浮氏体还原为金属铁、抑制铁橄榄石的生成从而提高铁精矿回收率,并有一定的脱硫作用.%In order to provide the development and utilization technical basis on a fine low-grade hematite iron from Inner Mongolia, a experimental was carried out by high intensity magnetic separation-reverse flotation process, high intensity magnetic separation-flotation process and the deep reduction-weak magnetic separation process. The results showe that; high intensity magnetic separation-flotation separation process cannot achieve ideal result, but through the test of deep reduction-low intensity magnetic separation, in the condition of coal consumption 30% , resistant reducing agent CCO 15% , roasting temperature at 1 200 ℃ for 90 min, a concentrate of the Fe content of 91.44% , with the Fe recovery of 91.22% is produced. The mechanisms of CCO were also investigated by XRD and SEM. The results show that CCO can promote the wustite reduce to metallic iron and inhibit the formation of fayalite and play a role of desulfurization.