Abstract: The Influence factors of the matte smelting process, slag cooling method, cooling rate and slag composition on copper recovery in flotation are discussed.It is pointed out that slag cooling method and cooling rate are the main factors that affected the flotation recovery from copper slag.Taking sodium silicate as dispersant and inhibitor, and butyl xanthate and P3 as combinatorial collector, experiments on flotation recovery of copper from copper slag for a domestic copper melting plant are made.Under grinding of 90% -320 mesh, a copper concentrate grading 17.08% at a 56.98% copper recovery was obtained.

Key words: Copper slag, Copper flotation, Grinding fineness, Combinatorial collector