Abstract: Low alkalinity flotation process is made on a low-grade porphyry Cu-Mo ore samples.In bulk flotation stage of copper-molybdenum, high quality combining inhibitors CS were adopted to separate copper and sulfur at low alkalinity (pH=7~8), with a higher recovery rate of associated molybdenum achieved.In Cu-Mo separation flotation stage, the new inhibitor BK510 instead of Na₂S was adopted to realize the inhibition of high content of secondary copper.A good Cu-Mo separation effect was achieved at low alkalinity (pH=8~9).In closed-circuit laboratory tests, molybdenum concentrate with molybdenum grade of 46.21% and recovery of 84.01%, and copper concentrate with copper grade of 24.61% and recovery of 89.25% were obtained. 

Key words: Low alkalinity, Inhibitor, Bulk flotation, Cu-Mo separation