Abstract: The grade of Mo and WO₃ in a molybdenum sulfide tailing of flotation is 0.093%，0.012% respectively，with fineness of 68.30% -0.074 mm.The molybdenum and tungsten mainly exists in form of minerals oxide，and its liberation degree reaches 85%.Ca²⁺ dissolved from gypsum，and great deal of slime ruined the recovery of tungsten and molybdenum oxide.Beneficiation experiments were conducted on the on-site tailings of molybdenum sulfide flotation in order to high efficiently recover the tungsten and molybdenum oxide minerals.The results show that using benzohydroxamic acid as collector and lead nitrate as activator，and through the bulk W-Mo flotation process of one roughing-one precleaning-two scavenging at room temperature，bulk flotation concentrate is concentrated to 55% in density and desorption for 45 min at 90 ℃.Then，through one roughing-two cleaning-one scavenging heating cleaning separation，W-Mo rough concentrate with 15.98% Mo and recovery of 51.54%，and 25.54% WO₃ and recovery of 63.85% was achieved.

Key words: Gypsum, Tungsten-molybdenum oxide ore, Inevitable ions, Chelating collector, Benzohydroxamic acid, Heating concentration