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

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.