Abstract: The disseminated grain size of molybdenite in a low-grade and high mud bearing molybdenum ore in Jilin is uneven and the shape is complex. In order to determine the high efficiency and low cost development and utilization process of ore，beneficiation tests were carried out. The results showed coarse concentrate with Mo grade of 6.955% and recovery rate of 91.83% can be obtained by adopting the process of one roughing，one cleaning，two scavenging and the middling returning in sequence when the grinding fineness of the ore with Mo grade of 0.081% is -74 μm accounting for 55%. Molybdenum concentrate with Mo grade of 53.79%，Cu content of 0.17% and molybdenum recovery rate of 94.44% can be obtained by adopting the process of one coarse，five cleaning，two scavenging and middling return in sequence when the regrinding fineness of the coarse concentrate with Mo grade of 6.90% and Cu content of 1.12% is -38 μm accounting for 90%. The test process is simple and efficient，which can be used as a basis for development and utilization.

Key words: molybdenum ore, sliming, regrinding of coarse concentrate, sodium sulfide inhibitor