Jet flow device for injecting gas into molten metal and process
First Claim
1. A device for injecting gas into molten metal in a furnace chamber comprising:
- (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 tube adapted to inject gas into the high velocity stirring jet emerging from the orifice in an axial core region thereof of maximum velocity 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.
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Accused Products
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.
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Citations
17 Claims
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1. A device for injecting gas into molten metal in a furnace chamber comprising:
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(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 tube adapted to inject gas into the high velocity stirring jet emerging from the orifice in an axial core region thereof of maximum velocity 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. - View Dependent Claims (2, 3, 4, 5)
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6. A process for treating molten metal with a treatment gas comprising the steps of:
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(a) providing a melt of a metal in a treatment device comprising a treatment vessel and a separate reservoir chamber flow connected to the treatment vessel by an orifice; (b) heating the melt in the treatment vessel to maintain a desired treatment temperature, (c) alternatively and successively producing in the reservoir chamber a vacuum for drawing molten metal into the reservoir from the treatment vessel and a positive pressure for expelling the molten metal therefrom through the orifice into the treatment vessel in the form of a high velocity jet and (d) injecting a treatment gas through a tube into the high velocity jet emerging from the orifice in an axial core region thereof of maximum velocity such that the gas is broken down into a large number of small bubbles which are circulated throughout the treatment vessel with the jet. - View Dependent Claims (7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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Specification