Abstract: The grade of Cu and Mo in a low-grade copper-molybdenum ore in Xinjiang is 0. 81% and 0. 02%,respectively. The main recoverable minerals are chalcopyrite and molybdenite, and the gangue minerals are mainly pyrite, feldspar, quartz,diopside,tremolite and calcite. In order to recover copper and molybdenum from ore effectively,mixed flotation process was used to carry out beneficiation test aiming at ores propertites. The optimum roughing conditions were determined by single factor test as grinding fineness of -0. 074 mm accounting for 60%,lime dosage of 500 g / t,sodium hexametaphosphate dosage of 30 g / t,combined collector total dosage of 60 g / t ( mass ratio of butyl xanthate to Z-200 of 1 ∶1),and 2# oil dosage of 15 g / t. On this basis,the closed-circuit flotation process of " one mixed roughing flotation,three blank cleaning flotation and three scavenging flotation" was adopted to treat the ore. Finally,the copper and molybdenum mixed flotation concentrate with Cu grade of 25. 16%,Cu recovery rate of 94. 02%,Mo grade of 0. 59% and Mo recovery rate of 90. 21% could be obtained. The comprehensive recovery of valuable metals from low grade copper molybdenum ore is realized.

Key words: copper-molybdenum ore,low grade,bulk floation,comprehensive recovery