Abstract: In view of a low grade refractory Cu-S ore characteristics, the separation conditions of Cu-S bulk flotation and separation flotation of Cu-S were studied,the technological conditions which was determined can solve effectively the problem that the difficulty of Cu-S separation due to high content secondary copper sulphide.In the condition of the grinding fineness of Cu-S bulk flotation was 70%-0.074 mm and the regrinding fineness of Cu-S concentrate was 90%-0.043 mm,the process flowsheet with once roughing, twice cleaning and once scavenging of Cu-S bulk flotation, the Cu-S concentrate after reginding with once roughing, twice cleaning and once scavenging of Cu-S separation ,middlings return in order was adopted, the test result can be obtained:Cu concentrate with copper grade 16.25% and recovery 63.07%,S concentrate with sulfur grade 37.45% and recovery 80.03%．

Key words: Low grade refractory copper-sulfur ore, Secondary copper sulphide, Cu-S bulk flotation,Regrinding, Separation of Cu from S