Abstract: Cu-Mo minerals mainly exist in form of sulfide ore and closely associated with each other in fine dissemination in a large-scale porphyry low grade copper-molybdenum deposit in Chifeng.In order to realize high efficient development and utilization of the ore,conditioning tests of mineral processing for the ore were carried out.The results showed that,under the optimum grinding fineness for copper and molybdenum mixed flotation at 0.074 mm passing 70%,grinding fineness for copper and molybdenum separation at 0.043 mm passing 80%,copper concentrate with copper grade of 17.51%,copper recovery of 81.25%,and molybdenum concentrate with molybdenum grade of 42.41%,molybdenum recovery of 88.35% were obtained through closed-circuit process of one roughing,two cleanings,one scavenging and middles back to the flow-sheet in turn for copper and molybdenum mixed flotation,and the closed-circuit process of one roughing,five cleanings,two scavengings and middles back to the flow-sheet in turn for copper and molybdenum separation flotation.

Key words: Porphyry type copper-molybdenum ore, Copper-molybdenum bulk floation, Copper and molybdenum separation, Grinding