Device for the separation of air from the floatation foam.

Device for removing air from a flotation foam (9) formed during flotation of a suspension (S) containing paper fibers, which contains a driven, characterized rotor because the rotor has a shaft (3) on whose periphery is at least one rotor blade (4) and that the rotor is surrounded in the rotor wing (4) by a wall (2, 2 ', 2 ") rotationally.