Abstract:A low-grade copper-molybdenum ore in Heilongjiang average contains Mo 0.026% and Cu 0.015%,belongs to low grade ore.In order to reduce the cost of mineral processing and effectively recover valuable metals,detailed process mineralogy study was carried out.Research found that metal sulfide in the ore are molybdenite, chalcopyrite, pyrite and pyrrhotite,gangue minerals is potassium feldspar, plagioclase and quartz.The main disseminated particle size of molybdenite is between 0.01-0.5mm,about 49.44% belongs to micro-fine or fine particles.Main disseminated particle size of chalcopyrite is between 0.02-0.25mm and belongs to micro-fine or fine particles.Molybdenite and chalcopyrite are closely related to each other,and chalcopyrite has good floatability lead difficult separation of copper and molybdenum.According to the research results of process mineralogy,suggested to use fast floating and roughing flow diagram, molybdenum concentration strengthening inhibition of chalcopyrite and increase the scavenging,content of copper in molybdenum concentrate is reduced, and the comprehensive utilization of copper is realized.