Experimental research on the deep reduction-magnetic separation of ironsand

The basic characteristics of ironsand were systematically studied by chemical analysis, scanning electron microscopy and X-ray diffraction. A series of experiments were performed to investigate reduction-magnetic separation for Fe and Ti from iron-sand. The effects of reduction temperature, reduction time, carbon ratio, magnetic density, and grinding fineness on the reduction-magnetic separation process were investigated. It could be found that the ironsand mainly consisted of titanomagnetite and titanohematite. The optimal process parameters were obtained as follows:reduction temperature, 1300℃; reduction time, 30 min; C/O molar ratio, 1.1; magnetic density, 50 mT; and the grinding fineness of -0. 074 μm, 86. 34%. Under such conditions, the metallization rate, the iron grade of magnetic substance and the iron recovery reached to 94.23%, 97.19% and 90. 28%, respectively, and the titanium grade of non-magnetic substance and the titanium recovery were 57. 94% and 87.22%, respectively. The effective separation of iron and titanium could be achieved in this reduction-magnetic separation process.