Specialized metallurgical processes – compositions for use therei – Processes – Free metal or alloy reductant contains magnesium
Patent
1993-04-09
1994-08-23
Andrews, Melvyn J.
Specialized metallurgical processes, compositions for use therei
Processes
Free metal or alloy reductant contains magnesium
75681, 75708, 266208, 266233, C22B 904
Patent
active
053403797
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.
REFERENCES:
patent: 1907481 (1933-05-01), Betterton
patent: 3599831 (1971-08-01), Harvill
patent: 4008884 (1977-02-01), Fitzpatrick et al.
patent: 4169584 (1979-10-01), Mangalick
patent: 4328958 (1982-05-01), Dolzhenkov
patent: 5020778 (1991-06-01), Thibault et al.
Dube Ghyslain
Tremblay Francois
Alcan International Limited
Andrews Melvyn J.
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