Abstract: In order to reduce the grade of tailings and improve the metal recovery rate，Baixiangshan Concentrator of Masteel Gushan Mine carried out the research on 30~0 mm raw ore by dry discarding and high-efficiency magnetic separation on fine-grained magnetite. The test results show that for 30~0 mm raw ore with magnetic pulley one magnetic separation or one roughing one scavenging dry separation，when the discarding rate of the two processes are close to each other，compared with one magnetic separation，the iron grade of tailings thrown out by one roughing one scavenging process is 0.33 percentage points lower， and the magnetic iron content is 0.26 percentage points lower. The effect of one roughing one scavenging waste is obviously better than that of one magnetic separation. Compared with low-intensity magnetic sepa⁃ ration，the grade of high-efficiency magnetic separation concentrate increased by 0.71 percentage points， the grade of magnetic iron increased by one percentage point，the recovery rate of magnetic iron increased by 0.70 percentage points，and the grade of magnetic iron in tailings decreased by 1.60 percentage points. Compared with the low-intensity magnetic separation，the iron grade of the two high-efficiency magnetic separation concentrate increased by 1.10 percentage points，the magnetic iron recovery rate increased by 0.11 percentage points，and the magnetic iron content in the tailings decreased by 0.85 percentage points. The separation index of high efficiency magnetic separation is obviously better than that of ordinary magnet⁃ ic separator.

Key words: grinding grading, efficient magnetic separation, concentrate grade, recovery