Abstract: A low-grade lead-zinc ore in Xinjiang is of simple mineral composition,complex mineral association relationship and uneven particle size.In order to recover lead and zinc in the ore effectively,the appropriate beneficiation process flow and reagent system were determined through the experiments of lead-zinc flotation conditions with lead-zinc preferential flotation process.The results showed that in the condition of grinding fineness of -0.074 mm accounting for 70%,aiming at the raw ores with lead grade of 1.04% and zinc grade of 1.66%,the lead concentrate with lead grade of 45.16% and zinc grade of 1.21% could be obtained by using two roughing for lead selection and then three cleaning for lead coarse concentrate which has been ground to -0.038 mm accounting for 100%.After activation of lead-selected tailings by CuSO₄,zinc was selected by two roughing and three cleaning.Finally,lead concentrate with lead grade of 44.16% and lead recovery rate of 85.04% and zinc concentrate with zinc grade of 43.31% and zinc recovery rate of 92.45% were obtained by closed-circuit test in the whole process,which better realized the separation and recovery of lead and zinc.The research results can provide useful reference for the development and utilization of the same type ore.

Key words: lead-zinc sulfide ore,low grade,dissemination characteristic,preferential flotation,reagent system,lead-zinc separation