Abstract: Main valuable element of a Cu-Pb-Zn multi-metal ore in Inner Mongolia is copper,lead,zinc and silver,the main valuable metallic mineral is galena,sphalerite,pyrite and chalcopyrite etc,are symbiosis intimately.In order to ascertain mineral processing flow of the ore,the principle process of mineral processing experiment are adopted by process of copper-lead bulk flotation then copper float lead suppression,zinc-sulfide bulk flotation then zinc float sulfide suppression.The results show that：with grinding fineness of -200 mesh passing 70%,via one roughing-three cleaning-two scavenging copper-lead bulk flotation,one roughing-two cleaning-one scavenging copper and lead separation,one roughing-one cleaning-three scavenging zinc-sulfide bulk flotation,one roughing-three cleaning-two scavenging zinc and sulfide separation process,copper concentrate with 13.52% Cu and 3 398.44 g/t Ag,Cu and Ag recovery of 68.95% and 29.25%,lead concentrate with 68.36% Pb,3 053.78 g/t Ag,Pb and Ag recovery of 84.28% and 46.39%,zinc concentrate with 46.73% Zn and 241.13 g/t Ag,Zn and Ag recovery of 81.85% and 11.90%,and sulfide concentrate with 16.09% S and recovery of 18.89% was obtained.

Key words: Cu-Pb-Zn complex multi-metal sulfide ore, Copper-lead bulk flotation and then separation, Zinc-sulfide bulk flotation and then separation