Combined inhibitor for flotation separation of lead-zinc sulfide ore and application

The invention discloses a combined inhibitor for flotation separation of lead-zinc sulfide ore and application. The combined inhibitor comprises zinc sulfate and iminodisuccinic acid. The combined inhibitor is used as a sphalerite inhibitor for flotation separation of galena and sphalerite. The method comprises the steps of conducting ore grinding and pulp mixing on raw ore, obtaining ore pulp to be floated, sequentially adding a combined inhibitor, quick lime, a collecting agent and a foaming agent into the ore pulp for lead flotation operation, obtaining lead concentrate and lead flotation tailings, sequentially adding an activating agent, the collecting agent and the foaming agent into the lead flotation tailings for zinc flotation operation, and obtaining zinc concentrate and tailings. The combined inhibitor has a strong inhibition effect on sphalerite, flotation separation of galena and sphalerite is effectively achieved, the combined inhibitor can be naturally degraded and is environmentally friendly, a