Refining molten metal

Details Refining molten metal Refining molten metal

1977-05-02

1978-09-12

Rosenberg, P. D.

Specialized metallurgical processes, compositions for use therei

Processes

Electrothermic processes

75 59, 75 82, C21C 530

Patent

active

041134699

ABSTRACT:
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.

REFERENCES:
patent: 3046107 (1962-07-01), Nelson
patent: 3594155 (1971-07-01), Ramachordran
patent: 3773497 (1973-11-01), Grenfell
patent: 3816720 (1974-06-01), Bauer
patent: 3850617 (1974-11-01), Umowski
patent: 3930843 (1976-01-01), Fruehan

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