SF type flotation machine for separation of non-ferrous metals, ferrous metals, precious metals, non-metallic mineral and chemical raw materials, recovery of useful minerals. The device has the following characteristics: inspiratory capacity, low power consumption. Both inspiratory per slot, suction flotation pulp and triple functions, self-flotation circuit, without any auxiliary equipment, the level of configuration, ease of process changes. Pulp cycle reasonably can to minimize the grit precipitation. Pulp with surface-controlled device, adjusting the convenience. Impeller with backward-style upper and lower leaf. The leaves on the pulp cycle, under the leaves under the pulp cycle