Specialized metallurgical processes – compositions for use therei – Processes – Electrothermic processes
Patent
1995-10-02
1997-07-22
Andrews, Melvyn
Specialized metallurgical processes, compositions for use therei
Processes
Electrothermic processes
75 1024, 222590, 222592, C22B 400
Patent
active
056499922
ABSTRACT:
A method of electroslag refining of metal is taught. The method includes the introduction of unrefined metal into an electroslag refining process in which the unrefined metal is first melted at the upper surface of the refining slag. The molten metal is refined as it passes through the molten slag. The refined metal is collected in a cold hearth apparatus having a skull of refined metal formed on the surface of the cold hearth for protecting the cold hearth from the leaching action of the refined molten metal. A cold finger bottom pour spout is formed at the bottom of the cold hearth to permit dispensing of molten refined metal from the cold hearth. The flow rate of molten metal through the cold finger apparatus is controlled by coordinating, among other parameters: the rate of melting of the unrefined metal; the hydrostatic head of molten metal and slag above the bottom pour cold finger orifice; the rate of induction heat supplied to the metal within the cold finger apparatus; the rate of heat removal from the metal within the cold finger apparatus through the cold finger apparatus itself and through adjacent gas cooling means; and by applying electromagnetic force to selectively speed up, slow down and/or interrupt the flow of metal through the cold finger apparatus via an electromagnetic orifice, preferably utilizing a processor, such as a computer.
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Benz Mark Gilbert
Carter, Jr. William Thomas
Dupree Paul Leonard
Knudsen Bruce Alan
Zabala Robert John
Andrews Melvyn
General Electric Company
Johnson Noreen C.
Pittman William H.
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