Apparatus for refining molten aluminum

F - Mech Eng,Light,Heat,Weapons – 27 – D

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F27D 3/16 (2006.01) C22B 9/05 (2006.01) C22B 21/06 (2006.01)

Patent

CA 1137309

APPARATUS FOR REFINING MOLTEN ALUMINUM ABSTRACT OF THE DISCLOSURE In an apparatus for refining molten metal comprising, in combination: (a) a vessel; (b) inlet and outlet means for molten metal and gases; and (c) at least one rotating gas distributing means dispersed in said vessel, said gas distributing means comprising (i) a rotatable shaft coupled to drive means at its upper end and fixedly attached to a vaned circular rotor at its lower end; (ii) a hollow stationary sleeve surrounding said shaft and fixedly attached at its lower end to a hollow circular stator; (iii) an axially extending passageway for conveying and discharging gas into the clearance between the rotor and stator, said passageway being defined by the inner surface of the sleeve and stator and the outer surface of the shaft; and (iv) means for providing gas to the upper end of the passageway under sufficient pressure to be injected into the vessel, the improvement comprising utilizing, in the combination, a smooth outer surface construction for the stator and a ratio of the diameter of the stator to the root diameter of the rotor in the range of 1:1 to about 0.8:1. SPECIFICATION

347078

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