Abstract: In view of serious lead and sulfur inclusions, strong activity of zinc at pH=9 and difficult depression in the beneficiation of low-grade complex lead-zinc ore, a combination of sodium sulfite and zinc sulfate was used as depressor and a combination of SN-9# and butyl xanthate as collector, which effectively improved the recovery of both lead and zinc at a low pH value.

Key words: Low grade, Lead-zinc ore, Combination reagent