Abstract: Aiming at solving the problems of mechanical inclusion and relatively low concentration ratio of concentrate in the current high gradient magnetic separators,a vibrating matrix was introduced into the high gradient magnetic separation process to form a vibrating-pulsating coupling force field,to improve the separation accuracy. A new type of periodic vibratingpulsating high gradient magnetic separator was then developed and used for the separation of an ultra-fine copper-molybdenum mixed concentrate. The results showed that the pulsating field is beneficial to slurry dispersion and to washing the adsorbed minerals on the surface of magnetic matrix,while the vibrating field further reduces the inclusions of non-magnetic particles, thereby increasing the collision probability of magnetic matrix with magnetic minerals and generating an obvious improvement on the concentrate grade and recovery. For the ultra-fine copper-molybdenum mixed concentrate assaying 26. 12% Cu and 0. 36% Mo,this new magnetic separator produced a high-quality copper concentrate assaying 0. 07% Mo at a yield of 42. 53% and 50. 42% copper recovery;meanwhile,the molybdenum concentrate produced from the separator assays 0. 57% Mo at a molybdenum recovery reaching 91. 56%. The molybdenum removal rate reached 80. 56% at a separation efficiency of 40. 61%, showing a significant copper-molybdenum separation performance. The size-by-size recovery analysis of the copper and molybdenum concentrates indicates that the separator may effectively separate this fine copper-molybdenum mixed concentrate. This new high gradient magnetic seaprator has provided a new technical sulotion for the high-efficient separation of fine weakly magnetic ores.