Abstract: Molybdenum tailing，with molybdenum grade of 0.086%，tungsten grade of 0.13%，is discarding in tailing pool.Due to long-term piled up，the oxidation rate of molybdenum is as high as 51.76%，with fineness particle size distribution，and the floatability is poor.In order to develop and utilize the ore，systematic beneficiation technology process and regime of reagent is carried out.The results indicated that，after iron removal by low intensity magnetic separation-desliming for nonmagnetic products，using sodium carbonate as modifier，sodium silicate as depressor，W-189 as collector，through one roughing，three scavenging，one cleaning flotation operation and Mo-W mixed rough concentrate with Mo grade of 0.86%，WO3 contents of 1.21% is obtained.Through thicken，warming and pulp conditioning，and then one roughing，two scavenging，three cleaning operation dealing with the Mo-W mixed rough concentrate，Mo-W mixed concentrate with Mo grade of 12.78% and recovery of 54.94%，WO₃ contents of 21.96% and recovery of 72.45% is obtained，which realize comprehensive recovery of tungsten and molybdenum. 

Key words: Tailings in a pool, Bulk flotation, Petrov Method