C - Chemistry – Metallurgy – 21 – C
Patent
C - Chemistry, Metallurgy
21
C
39/105, 53/363
C21C 7/072 (2006.01) B01F 3/04 (2006.01) B01F 3/08 (2006.01) B01F 5/04 (2006.01) B22D 41/58 (2006.01) C22B 9/02 (2006.01) C22B 9/05 (2006.01) C22B 21/00 (2006.01) C22B 21/06 (2006.01) F27D 3/16 (2006.01)
Patent
CA 2029680
Abstract A device is described for injecting gas into molten metal, e.g. molten aluminum, in a furnace chamber. It comprises: (a) a stirring apparatus having a reservoir chamber separate from the furnace chamber, a connector portion with an orifice connecting the interior of the furnace and the reservoir for the passage of the molten metal between them through the connector portion, vacuum/pressure generating means connected to the reservoir chamber interior for alternatively and successively producing therein a vacuum for drawing molten metal into its interior from the furnace chamber and a positive pressure for expelling the molten metal therefrom into the furnace chamber through the orifice in the form of a high velocity stirring jet, and (b) gas injector means adapted to inject gas into the high velocity stirring jet such that the gas is broken down into a large number of small bubbles which are circulated throughout the furnace chamber with the stirring jet.
Dube Ghyslain
Tremblay Francois
Alcan International Limited
Kirby Eades Gale Baker
LandOfFree
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