A research on the separation of a certain coppernickel sulfide ore was carried out by use of cyclone - static micro - bubble flotation column. Under the condition of 92% of the - 200 item,when the flotation column is used to separate the ore, the recovery of nickel reached 60. 67% which is 9. 32% higher than best index of nickel recovery obtained by flotation cell,and the nickel grade of the concentrate is 6. 93% which is 2. 14% higher than best index of nickel grade obtained by flotation cell. The analysis of the technological mineralogy shows that most of bravoite,pyrrhotine and chalcopyrite are concentrated,and most of gangue mineral is eliminated under the conditions. The bravoite lost in the rejects is mainly intergrowth,and the easilyseparating bravoite monomer is basically recycled,while a part of bravoite monomer under 11. 3 micrometer is lost.