Abstract:By means of mineral liberation analysis,scanning electron microscope and other chemical analysis instrument,the systematic process mineralogy of lead-zinc ore in Jiangxi were investigated.The ore minerals contains sphalerite,galena and pyrite as major metal minerals,and contains carbonate rocks as major gangue minerals,which makes the dissociation of useful minerals more difficult.The main useful elements in the ore with high economic value were Pb(1.98%) including 74.26% lead from galena,Zn(3.27%) including 64.75% lead from sphalerite,Au(0.3 g/t) and Ag(73.5 g/t).Galena,sphalerite and pyrite disseminated with very fine particle size,are all belong to the category of medium and fine grain.Under the condition of pyrite particle size of -0.074 mm accounts for 21.45%,the dissociation degrees of galena and sphalerite in raw ore were 54.8% and 57.8%,which reflected the complex relationship of intergrowth in the ore.Analysis of dissociation degree under different pyrite particle size showed that it is more reasonable to adopt the the pyrite particle size of -0.074 mm accounts for 83% as the fineness of coarse grinding,with the dissociation degree of galena and sphalerite were 83.1% and 85.5%.According to the process mineral of this ore type, it is suggested to adopt the preferential flotation process of sequential flotation of lead, zinc and sulfur to obtain lead, zinc and sulfur concentrates.