Abstract: A large scale low grade oxidized lead-zinc mine containing 2.37% Pb and 4.60% Zn with a high ratio of oxidized lead-zinc ores reaching more than 90% has not been exploited.In order to utilize this kind of resources, an experimental study on beneficiation is carried out in which the process flow-sheets of sulfurization-lead floating with xanthate and desliming-sulfurization-zinc floating with amine collector KZF are adopted.A good technical index with 39.92% of lead concentrate containing 5.18% Zn at a Pb recovery of 61.31% and 37.03% of zinc concentrate containing 1.23% Zn and at a Pb recovery of 67.29% is achieved.

Key words: Oxidized lead-zinc ore, Flotation, Sulfurization, Desliming, New-type amine collector KZF