Abstract:The grade of molybdenum and tungsten in a molybdenum and tungsten ore is low, with molybdenum content of 0.36% and tungsten content of 0.88%, and —38 μm accounts for 90%. The mineral matter in the ore is complex, the useful mineral particle size is small and relatively dispersed, and the continuous growth of mineral particles is extremely complex. Tungsten and molybdenum was extracted and recovered by roasting - chemical leaching. Effects of ratio of liquid to solid, dosage of leaching agent, leaching temperature and leaching time on leaching were carried out. The results show that leaching rate of molybdenum and tungsten is 83.79% and 39% respectively under the conditions including ratio of liquid to solid of 6 mg/g, dosage of oxidant A1 of 10 kg/t, dosage of alkaline leaching agent B1 and C1 is 80 kg/t and 9 kg/t respectively, leaching time of 4 h, and leaching temperature of 80 ℃. Through fine grinding strengthening with —20.043 μm accounts for 90%, under the same conditions, the leaching rate of molybdenum and tungsten is 94.11% and 60.74% respectively, and good leaching effect is obtained.