Pyrite flotation method

The invention provides a pyrite flotation method, belongs to the technical field of mineral processing, and aims to solve the problems of high cost and low recovery rate in the pyrite flotation process. The pyrite flotation method comprises the following steps: carrying out magnetic separation on selected ore pulp to obtain magnetic separation tailings and pyrrhotite concentrate; concentrating the magnetic separation tailings to obtain underflow ore pulp and overflow water; the underflow ore pulp is subjected to roughing, and roughing foam and roughing middling are obtained; the roughing foam is subjected to multi-stage concentration, and concentrated middlings and pyrite concentrate are obtained; the rough middling and the fine middling are combined for scavenging, and scavenging foam and tailings are obtained; the scavenged foam is combined into the underflow pulp for re-roughing. According to the method, the sulfur-containing grade of the pyrite is effectively improved, and the equipment investment and ope