Patent ID: 7980824

Claim:
A rotor of a gas dispersion mechanism to be used in a flotation machine, the rotor comprising: a cover disc for attachment to a rotatable shaft, air ducts extending downward from the cover disc in an outer region of the rotor for delivering air to the periphery of the rotor whereby the rotor defines a space for the slurry inward of the air ducts, the air ducts being defined by air duct walls extending from the interior of the rotor to the periphery of the rotor and forming mixing and pumping blades of the rotor, wherein outer surfaces of the air ducts define slurry grooves that are in fluid communication with the space for the slurry, air channels for conducting air into the air ducts, and a collar disposed below the cover disc and encircling part of the slurry space for guiding the slurry flow into the interior of the rotor, and wherein the collar has an upper edge and the air duct walls have lower end portions that extend downward beyond the upper edge of the collar and are disposed outward of the collar.