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US 4,397,684 AGranted
Process for pneumatic stirring of a bath of molten metal
AssigneeInstitut de Recherches de la Siderurgie Francaise (IRSID)
InventorJean-Claude Grosjean
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AssigneeInstitut de Recherches de la Siderurgie Francaise (IRSID)
InventorJean-Claude Grosjean
Estimating the term…
A process of pneumatic stirring of a bath of molten metal according to which a stirring fluid is injected through permeable refractory elements arranged at the bottom of a crucible containing the bath, in which the used stirring fluid is, at least temporarily, an organic liquid such as hydrocarbon. The process is advantageously used on a bath of molten pig iron during refining of the same by oxygen, and in which the organic liquid is replaced immediately after decarburization of the bath by an inert gas such as argon or nitrogen. The process thus permits an efficient stirring of the bath of molten metal without the risk of polluting the metal either by hydrogen or nitrogen.
A process for pneumatic stirring during at least a part of a refinement period of a bath of molten metal in a crucible comprising the steps of injecting a stirring fluid through elements of permeable refractory material wherein the stirring fluid injected through the elements consists of an organic liquid which vaporizes upon contact with the molten metal.
Dependencies are inferred from the claim text.