Abstract: The slag stemmed from copper metallurgy with copper and iron content of 0.62% and 35.58% separately was from Yunnan province.Main copper minerals in the slag were chalcopyrite，azurite and chalcocite.Copper minerals were finely disseminated and closed associated with olivine in the slag，which belongs to the refractory secondary copper resource.Concentration process for copper recovery was conducted in order to recover copper from the slag.The optimum conditions are determined as the grinding fineness of 0.074 mm 96.50% and butylamine dithiophosphate+butyl xanthate，sodium carbonate，matte dosage of 300+100 g/t，4 kg/t，15 kg/t respectively.Copper concentrate with copper grade of 21.30% and copper recovery of 86.20% was obtained by adopting the closed circuit flotation process of one roughing-one scavenging-two cleanings，and middles back to the flow-sheet in turn.The test result showed that for this micro-finely disseminated copper sulfide，matte as “carrier” in flotation plays an important role in getting an ideal flotation index.

Key words: Copper slag, Micro-fine dissemination, Matte, Carrier flotation