Abstract: Aimng at the characteristics of fine particle size,complex symbiosis and high oxidation rate of a lead-zinc ore,a systematic beneficiation experiment was carried out.The principle flow of lead and zinc sequence flotation was determined and the suitable reagent system was established through condition test.The results showed that:① Part of cerussite could be effectively activated with the addition of Na2S in the lead flotation and lead recovery rate improved in consequence.XDT-22 combined with zinc sulfate could effectively inhibit zinc mineral floating and reduce zinc contents in the lead concentrate.XCT-11 as an auxiliary collector could further improve the lead recovery rate.② The combined collector XCT-11 could strengthen the collection of zinc minerals and improve the zinc recovery rate in the zinc flotation.③ Under the grinding fineness of -74 μm accounting for 75%,lead concentrate with lead grade of 47.85% and lead recovery rate of 68.31% and zinc concentrate with zinc grade of 45.86% and zinc recovery rate of 82.81% were obtained respectively in the closed-circuit test,indicating the better indexes.

Key words: lead-zinc ore, high oxidation rate,disseminated grain size, priority flotation