安徽褐铁矿的磁化焙烧-磁选工艺

Magnetizing roasting-magnetic separation of limonite ores from Anhui Provice in east China

针对安徽某低品位褐铁矿石,采用磁化焙烧-磁选工艺进行了实验研究,对该矿的原矿进行了岩相分析,并对磁化焙烧-磁选工艺参数进行了优化.结果表明,该矿属低磷硫的低品位褐铁矿,褐铁矿与脉石矿物的镶嵌关系较为复杂,结晶水含量高,属难选矿石.对铁品位48.01%的原矿,在850℃、内配煤5%(质量分数)的条件下,磁化焙烧15min,焙烧矿磁化率达到最佳值,褐铁矿几乎全部转化为磁铁矿,这由X射线衍射结果证实.该褐铁矿通过磁化焙烧-磁选工艺可获得品位62.94%、回收率87.99%的铁精矿.

The magnetizing roasting-magnetic separation process of limonite ores from Anhui Province in east China was experimentally studied,which covers determining the mineralogy of raw ores and optimizing the magnetizing roasting-magnetic separation process parameters.It is shown that the limonite ores contain low phosphorus and sulphur and high loss on ignition （LOI）;the iron minerals and gangue have complicated occurrence,indicating that the limonite ores are extraordinarily refractory iron ores.Through magnetizing roasting of raw ores assaying 48.01% Fe and blending 5% coal fines at 850℃ for 15min,the best magnetization ratio of roasted iron ores is achieved,where almost limonite is transferred to magnetite.This result was proven by X-ray diffraction.By the magnetizing roasting-magnetic separation process,an iron ore concentrate with 62.94% TFe and 87.99% recovery is produced.