Abstract: Chalcopyrite is paramagnetic and molybdenite is diamagnetic,and thus they are separatable through high gradient magnetic separation. A SLon-100 periodic pulsating high gradient magnetic separator was used to separate a roughing concentrate of chalcopyrite-molybdenite co-flotation from Jinduicheng Molybdenum Industry, which assays 14. 42% Cu and 12. 40% Mo,with -0. 019 mm ultra-fine fraction weighting 83. 80%. The results showed that under the conditions of a pulsating stroke of 5 mm,a pulsating frequency of 150 r/ min,a rod diameter of 1. 5 mm in matrix,a slurry flow rate of 2. 0 cm/ s,a roughing magnetic induction of 1. 6 T and a scavenging magnetic induction of 1. 7 T,a copper concentrate with a yield of 48. 64%,Cu grade of 22. 82%,Mo grade of 4. 40%,and Cu recovery of 77. 82% and a molybdenum concentrate with a yield of 51. 36%,Cu grade of 6. 16%,Mo grade of 19. 96%,and Mo recovery of 82. 73% were respectively obtained via one roughing and one scavenging pulsating high gradient magnetic separation process. This effective separation for the ultra-fine chalcopyritemolybdenite concentrate demonstrated the availability of pulsating high gradient magnetic separation technology for separating the ultra-fine copper-molybdenum concentrate,providing a valuable reference for the environment-friendly separation of similar copper-molybdenum bulk concentrates.

Key words: pulsating high gradient magnetic separation,ultra-fine copper-molybdenum separation,separation process