Beneficiation method of iron pyrite in lead-zinc flotation tailings

The invention provides a beneficiation method of iron pyrite in lead-zinc flotation tailings, and by adopting the efficient and clean beneficiation method, the sulfur indexes can be improved, the beneficiation reagent and beneficiation power consumption can be greatly reduced, especially the consumption of sulfuric acid can be reduced, and the corrosion on equipment and pipelines can be relieved. The beneficiation method comprises the following steps: concentrating lead-zinc flotation tailings, adding sulfuric acid, butylxanthate and oil No.2, and carrying out floatation on a first part of soothing concentrate by utilizing a floatation column; adding ferrous sulfate, butylxanthate and oil No.2 into the tailings of the floatation column, and carrying out floatation on a second part of soothing concentrate by utilizing a floatation machine.