Abstract: The iron grade of Anqian lean hematite ore is 16.67%. Iron mainly exists in the form of hematite， which accounts for 72.77% of the total iron. Main gangue mineral is quartz. In order to develop and utilize the iron ore， preconcentration experiment was conducted. Results indicated that， by iron enrich process of wet high-intensity magnetic pre-separation-grinding-low intensity magnetic separation-high intensity magnetic separation. At the feeding particle size -3 mm， background magnetic field intensity is 0.8 T， vertical ring speed 2.0 r/min， stroke frequency 200 times/min； grinding particle size -200 mesh 95%， intensity of low intensity magnetic separation is 120 kA/m， intensity of high intensity magnetic separation is 0.8 T， the preconcentration concentrate with TFe grade of 47.04% and recovery of 80.25% was obtained. The results can provide reference for the high intensity pre-separation of poor hematite ore in China.

Key words: Low-grade hematite ore, High intensity magnetic preconcentration, Background magnetic induction strength, Vertical ring speed, Stroke frequency