Abstract: Rotary device for treating molten metal has a hollow shaft with a rotor having a roof and a base spaced apart and connected by a plurality of dividers. A passage extends between each adjacent pair of dividers and the roof and the base. A flow path extends through the shaft into inlets of the passages and out of outlets. A chamber in which mixing of the molten metal and gas can take place is located radially inwardly of the inlets, has an opening in the base of the rotor and is in the flowpath between the shaft and the inlets. Upon rotation of the device, molten metal is drawn into the chamber through the rotor base where it is mixed with gas passing into the chamber from the shaft. The metal/gas dispersion is pumped into the passages through the inlets before discharge from the rotor through the outlets.

Abstract: A rotary device for treating molten metal, said device comprising a hollow shaft (30) at one end of which is a rotor (40), said rotor (40) having:—a roof (42) and a base (44), said roof (42) and base (44) being spaced apart and connected by a plurality of dividers (50); a passage (52) being defined between each adjacent pair of dividers (50) and the roof (42) and the base (44), each passage (52) having an inlet (54) in an inner surface of the rotor (40) and an outlet (56) in a peripheral surface of the rotor (40), each outlet (56) having a greater cross-sectional area than the respective inlet (54) and being disposed radially outward therefrom; a flow path being defined through the shaft (30) into the inlets (54) of the passages (52) and out of the outlets (56); and a chamber (48) in which mixing of the molten metal and gas can take place; wherein a plurality of first cut-outs (58a) are provided in the roof (42) and a plurality of second cut outs (58b) are provided in the base (44), each of the first and seco

Abstract: The invention relates to a rotary device for dispersing a gas in a molten metal. The device comprises a hollow shaft at one end of which is attached a rotor. The rotor has a roof and a base which are spaced apart and connected by a plurality of vanes. A compartment is defined between each adjacent pair of vanes and the roof and the base, and each compartment has an inlet and first and second outlets. A flow path is defined through the shaft into the inlets of the compartments and out of the first and second outlets. Each first outlet is disposed radially outwardly of the respective inlet and arranged to disperse gas laterally of the rotor in use, and each second outlet is disposed in the roof of the rotor and arranged to disperse gas upwardly from the rotor in use.

Abstract: The invention relates to a rotary device for dispersing a gas in a molten metal. The device comprises a hollow shaft at one end of which is attached a rotor. The rotor has a roof and a base which are spaced apart and connected by a plurality of vanes. A compartment is defined between each adjacent pair of vanes and the roof and the base, and each compartment has an inlet and first and second outlets. A flow path is defined through the shaft into the inlets of the compartments and out of the first and second outlets. Each first outlet is disposed radially outwardly of the respective inlet and arranged to disperse gas laterally of the rotor in use, and each second outlet is disposed in the roof of the rotor and arranged to disperse gas upwardly from the rotor in use.