Abstract:The copper content of a copper smelting slag in Yunnan is 0.82%. The copper in the copper slag mainly exists in the form of secondary copper sulfide and primary copper sulfide, with less copper oxide content. In order to comprehensively recover copper from the secondary resource and solve the problem of high grade of tailings in the concentrate, a large number of experimental studies on process parameters were carried out. Research shows that there are differences in floatability and flotation speed between different phases of copper. Therefore, using one-stage rapid flotation to select some easily floatable copper ores as qualified concentrates, and then activating and collecting the tailings of rapid flotation, not only simplifies the flotation process, but also makes full use of resources. The results of conditional test show that the flotation index is the best under the conditions of primary grinding fineness of -45μm accounting for 90%, combined collector ethyl xanthate 40g/t+Z-200 40g/t, activator sodium sulfide 200g/t and dispersant sodium silicate 400g/t. The closed-circuit test results show that qualified copper concentrate with copper grade of 22.64% and copper recovery rate of 77.03% can be obtained by using the flotation process with two roughings, two cleanings and two scavenges, while the tailings grade is 0.182%.