Abstract: College of Resources and Civil Engineering，Northeastern University,Shengyang 110819,China Main minerals of a refractory molybdenum ore is molybdenite，gangue minerals are quartz，feldspar，chlorite and calcite，bauxite，etc.the valuable elements is molybdenum.In order to develop and utilize the resource，stage grinding，stage flotation process is carried out.The results show that，at the grinding fineness of 60% passing 0.071 mm，with sodium silicate dosage of 2 000 g/t，kerosene of 200 g/t，2# oil of 70 g/t for rough floatation，rough concentrate grinding at 94% passing 0.071 mm through three cleaning operation，rough tailing through one scavenging process，molybdenum concentrate with molybdenum grade of 45.25% and recovery of 93.56% is obtained，which can provides basis for development of the ore.

Key words: Molybdenite, Flotation, Regrinding of rough concentrate