Abstract: A copper smelting slag in Anhui contains 1.64% copper. Copper mainly exists in the form of copper sulfide and elemental copper. The particle size of copper minerals is generally fine，and the copper mineral aggregates are mainly distributed at -0.043 mm. In order to determine the appropriate process for recovering copper resources from the smelting slag，a flotation test was carried out. The test results show that under the condition of one-stage grinding fineness of -0.074mm 74.2% and two-stage grinding fineness of -0.045mm 98.3%，by stage grinding process，the copper concentrate with copper grade of 23.33% and copper recovery of 86.36% was obtained by closed-circuit test through two roughing，two cleaning and three scavenging flotation process. The tailings contain 0.239% copper.

Key words: copper smelting slag, grinding, flotation