Abstract: Based on the feature of high contents of pyrrhotite and pyrite，complex dissemination of lead and zinc and fine dissemination，with the use of two kinds of new iron sulphide minerals depressants，BK-509 and BK-512，a new processing technology of lead，zinc and sulfur separation is made by were developed by magnetic separation-lead zinc selective flotation.The results showed that under grinding fineness of -0.074 mm 90%，lead concentrate assaying 56.71% Pb with lead recovery of 76.85%，and zinc concentrate assaying 45.98% Pb with zinc recovery of 75.57% were obtained by the process of one roughing-one cleaning low intensity magnetic separation，and two roughing-two cleaning lead flotation，and under lead rough concentrate's grinding fineness of -0.043 mm 85% four scavenging，and one roughing-two cleaning zinc flotation，and under zinc rough concentrate's grinding fineness of -0.043 mm 90% four scavenging.The test index was ideal and the process could be used as the designing references of lead-zinc recovery process.

Key words: Pb-Zn ore, Galena, Sphalerite, Pyrrhotite, Pyrite, Low intensity magnetic separation, Flotation, Regrinding of rough concentrate