Abstract: This paper elaborates on the comprehensive iron recovery technical study of smelting copper slag, selecting copper tailings and recovering iron. After the flotation of raw ore and magnetic separation of tailings, the iron rough concentrates are obtained. Then dispersant agent is added in, and again grinded and magnetic separated. After the comparison experiments about different types of dispersant agents, the NFS is the best. After three times of magnetic separation, it is discovered that iron concentrate grade was 52.21%, the iron recovery rate is 38.09%, and the SiO₂ grade is 13.2%, thus the comprehensive utilization is realized.