Abstract: A low grade and fine disseminated molybdenum ore in Hubei Province contains 0.129% of molybdenum,most of which exist in form of molybdenite distributed in the fissures of gangues with small flakes or scaly single crystals.With grain size of 0.01 mm,it is difficult to be liberated.In order to realize efficient exploitation of the mineral resources,stage grinding and stage separation process was conducted on the ore.The result showed that using the closed-circuit flowsheet of first grinding,one roughing-one cleaning-two scavenging,concentrate from first stage separation enduring regrinding,one roughing-six cleaning-three scavenging and middles back to the flowsheet in turn,molybdenum concentrate with 51.08% Mo and recovery of 85.92% was obtained.The process can achieve high efficient development and utilization of the ore.

Key words: Molybdenum ore, Flotation, Stage grinding and stage separation, Middling return to grinding