Abstract: The copper grade of high slime copper oxide ores is 4.26%， and the main copper minerals are malachite， followed by chalcocite， chrysocolla and shattuckite. The gangue minerals are mainly argillaceous siltstone， quartz silt， sericite and chlorite and so on. In view of the problem that the slime of copper oxide ores in the flotation process deteriorates the flotation， consumes a large amount of flotation agents and affects the flotation index， the flotation tests of direct sulphidizing flotation and mechanical desliming using cyclone were carried out for the ores with grinding fineness of -0.074 mm accounting for 64.04% （-0.010 mm accounting for 14.05%）， and the copper sulfide ores were selected firstly. The results showed that the copper leaching rate of the fine slime（yield of 12.64% and the copper grade of 4.82% treated by cyclone） is 95.26% after leaching process. The copper grade ， copper recovery rate and copper comprehensive recovery rate of the underflow （yield of 87.36% and the copper grade of 3.32% treated by cyclone） is 24.75%，67.47% and 84.01% respectively， after two roughing flotation . The copper concentrate with copper grade of 19.79% and recovery rate of 75.09% were obtained by directly sulphidizing flotation， and the copper grade of tailing reached up to 1.02%. Compared with the direct flotation of high slime copper oxide ores， the desliming flotation process is more stable and controllable， and can get ideal copper recovery index and lower dosage of flotation agents， which is a prospecting process.

Key words: High slime copper oxide ores, Cyclone, Desliming, Leaching, Flotation