Abstract: A deep-extened oxidized refractory lead-zinc ore, from Cangyuan County Yunnan province and in which zinc is in form of hemimorphite,is taken as research object.Technologies such as the direct flotation of Galena with butyl xanthate as collector,sulphidisation-flotation of Galena with butyl xanthate as collector and sulphidisation-flotation of hemimorphite with thiophenol as collector were carried out.Closed-circuit flotation process of floating Zinc after lead flotation,floating sulphide ore before oxidized ore is adopted to treat this ore, and lead concentrate containing 53.93%lead, 13.13% zinc and 1751.90 g/t silver, and zinc concentrate containing 31.82% zinc，2.75%lead, and bulk concentrate of zinc and lead containing33.38%lead, 19.10% zinc and 694.85 g/t silver are obtained at comprehensive recovery of 98% zinc,lead and silver together.

Key words: Oxided lead-zinc ores, Hemimorphite, Vulcanization, Thiophenol