Abstract: The surfaces of most copper-sulfide minerals are easily oxidized,which have a significant effect on the flotation of the minerals and the adsorption of reagents on the surface of minerals. At present,researchers have conducted extensive research on the effect of oxidation on the flotation of copper-sulfide minerals,and have obtained remarkable achievements. Based on the factors affecting the surface oxidation of copper-sulfide minerals,this paper focuses on analyzing factors such as solution properties,mineral lattice defects on the surface oxidation of copper-sulfide minerals. The difficulty of the flotation of coppersulfide minerals after oxidized increased and the reasons are analyzed. On one hand,the metal ions increased generated from the oxidation and dissolution,which will cause serious interaction effect of copper-sulfide minerals,thus making it difficult to realize the flotation separation of copper-sulfide minerals. One the other hand,the strong hydrophilic metal oxides and hydroxides generated from the surface oxidation of copper-sulfide minerals will seriously weaken the effective adsorption of collectors, resulting in a decrease in the floatability of copper-sulfide minerals. Based on this,the flotation strengthening measurements and mechanism of copper-sulfide minerals after oxidized are discussed from two aspects:the shedding method of the oxidation layer and the surface regulation method of copper-sulfide minerals after oxidized. At last,the relevant suggestions were proposed about the flotation strengthening measurements of oxidized copper-sulfide minerals. This could provide reference for achieving the effective flotation recovery of oxidized copper-sulfide minerals.

Key words: copper sulfide minerals,flotation,oxidation mechanism,reagents adsorption,strengthening measurements