The foaming agent is a kind of surface active material, which mainly reduces the interfacial tension at the gas-water interface, promotes the formation of small bubbles in the slurry, expands the sorting interface, and ensures that the bubbles rise to form a foam layer. The formation of bubbles in the flotation slurry depends mainly on various types of aeration stirring devices in the flotation equipment, and the addition of an appropriate amount of foaming agent to the slurry.