Abstract:The Cu and Mo grades of a porphyry copper ore in Xizang Province are 0.73% and 0.044% respectively. The main recyclable metal minerals are chene, chalcopyrite and molybdenite, while gangue minerals are mainly quartz, calcite and garnet. With the continuous exploitation of mineral resources and the change of rock strata distribution, the ore types are increasingly diverse, and the metasomatic and interlaying relations between minerals are complex. In order to recover copper and molybdenum from ore effectively, flotation tests were carried out by mixed flotation process according to the properties of raw ore. The optimum grinding fineness of -0.074mm accounted for 65%, the total amount of equal floating collector BK404C and BK345 was 32g/t, the total amount of enhanced coarse collector BK404B and BK404C was 28g/t, and the amount of lime was 2000g/t. On this basis, the closed-circuit flotation process of "once floatable roughing, once floatable cleaning, once strengthened roughing, twice strengthened cleaning, twice swept cleaning" is adopted to obtain a copper-molybdenum mixed concentrate with Cu grade of 23.27%, Cu recovery rate of 87.14%, Mo grade of 1.34% and Mo recovery rate of 82.24%. The comprehensive recovery of valuable metals from porphyry copper ore is realized.