Abstract: A vertical stirring mill is used as the regrinding equipment for fine-grained minerals.The fine-grained iron ore in the Qinhuangdao area is used as the test sample to conduct a test study on grinding and magnetic separation conditions.The results show that the particle size of the ground product reaches -0.038 mm It accounts for 95.43%.Highquality iron powder with a yield of 66.12%, a magnetic iron grade of 64.06%, a recovery rate of 97.16%, and a total iron grade of 65.94% can be obtained after one rough selection and two selections.The grinding power consumption test of the mill shows that when the particle size of the grinding product reaches -0.038 mm, which accounts for about 95.00%, the grinding power consumption is 15.20 kW·h/t.The test shows that the iron ore in the Qinhuangdao area can obtain good beneficiation indexes through fine grinding and dissociation.The vertical mixing mill is an efficient fine grinding equipment.