Abstract: In order to explore the efficient crushing and grinding separation technology suitable for fine-grained disseminated porphyry molybdenum ore，and solve the problems of high energy consumption， easy over-grinding and mudding of minerals，and poor dissociation effect of molybdenite in the traditional three-stage crushing-ball milling process，a fine-grained disseminated porphyry molybdenum ore was tak⁃ en as the object，and a comparative test of semi-autogenous grinding-stone crushing-ball milling com⁃ bined grinding process and traditional process was carried out，and the flotation reagent system and coarse concentrate regrinding parameters were systematically optimized. The study of process mineralogy shows that the molybdenum grade of the ore is 0.348%，the grain size of molybdenite is fine，and the gangue is dominated by feldspar minerals which are easy to mud，and the grindability is poor. Through single factor condition test and closed-circuit verification test，the optimum process parameters were determined: semi�autogenous grinding slurry concentration 75%，regrinding fineness of crude concentrate -0.038 mm 90%， emulsified kerosene as collector and sodium hexametaphosphate as slime dispersant. The closed-circuit test finally obtained an excellent index of molybdenum concentrate grade of 52.84% and molybdenum re⁃ covery of 94.60%. Compared with the traditional three-stage crushing-ball milling process，the compre⁃ hensive energy consumption of the combined process decreased from 28.5 kW· h/t to 23.2 kW· h/t，the yield of fine slime decreased from 22.5% to 10.2%，and the unit consumption of flotation reagents de⁃ creased by 21%. The process effectively balances the contradiction between mineral dissociation and over�grinding slime，and realizes the collaborative optimization of grinding and flotation operations，which can provide technical reference for the industrial production of the same type of low-grade fine-grained dissem⁃ inated molybdenum ore.

Key words: molybdenum ore, flotation, SAG-BM combined grinding, mineral liberation, energy con? sumption