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US 4,113,469 AGranted
Refining molten metal
AssigneeBritish Steel Corporation
InventorsHugh W. Grenfell, David J. Bowen, Robert Baker
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AssigneeBritish Steel Corporation
InventorsHugh W. Grenfell, David J. Bowen, Robert Baker
Estimating the term…
A method is provided for refining molten metal containing an impurity which is oxidizable in preference to one or more selected constituent elements of the metal and which forms a gaseous oxide, the method comprising injecting oxygen and a diluent gas into the molten metal contained in a vessel so as to reduce the proportion of the impurity in the metal by evolution as the gaseous oxide, weighing the vessel during refining to establish a point at which the weight of the vessel contents changes significantly due to preferential oxidation of the one or more selected constituent elements, initiating at the point a reduction in the ratio of oxygen: diluent gas to as to reduce the rate of oxidation of the one or more selected constituent elements relative to the impurity and continuing injection until the proportion of the impurity is reduced to the desired level.
A method for refining molten metal containing an impurity which is oxidisable in preference to at least one selected constituent element of the metal and which forms a gaseous oxide, the method comprising injecting oxygen and a diluent gas into the molten metal contained in a vessel so as to reduce the proportion of the impurity in the metal by evolution as the gaseous oxide, weighing the vessel during the refining to establish a point at which the weight of the vessel contents changes significantly due to the preferential oxidation of the at least one selected constituent element, initiating at the point a reduction in the ratio of oxygen:
Dependencies are inferred from the claim text.