Specialized metallurgical processes – compositions for use therei – Processes – Electrothermic processes
Patent
1982-04-12
1983-03-29
Rosenberg, P. D.
Specialized metallurgical processes, compositions for use therei
Processes
Electrothermic processes
C21C 710
Patent
active
043782426
ABSTRACT:
A bath of liquid steel containing metallic impurities is subjected to vacuum effective to cause emission from the bath surface of the metallic impurities as a bulk flow of rising gases. The surface of the bath is kept substantially free of surface contamination. The rising gases are disposed of to prevent reflux. The pressure is then returned to normal, and the treated steel recovered. Preferably, the chamber pressure is maintained at a level equivalent to 60% to 80% of the total vapor pressure of the liquid metal. Desirably, the liquid steel is lifted (for example, by using a gas), from a lower level in the bath to at least its surface to enhance circulation within the bath. Preferably the rising gases are condensed remote from the bath surface to prevent reflux. An apparatus suitable for treating molten metal to remove impurities includes a vacuum chamber enclosing a receptacle for a bath of molten metal, a gas outlet and an outlet for liquid condensate and vacuum pump means for applying a vacuum to the gas outlet. Two hollow legs lead downward from the bottom of the receptacle for immersion in a supply bath of molten metal. A condenser, above the liquid metal level in the receptacle, has surfaces for intercepting emitted gases and converting them to condensate. Means is provided for continuously injecting lifting gas into an up-leg to provide in it, upward circulation of metal and downward circulation in a down-leg. Preferably there is means at the top of up-leg for spraying liquid metal on the surface of the bath.
REFERENCES:
patent: 3239204 (1966-03-01), Hokanson
patent: 3798025 (1974-03-01), Ramachandran
Davenport William G.
Harris Ralph
LandOfFree
Vacuum purification of liquid metal does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Vacuum purification of liquid metal, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Vacuum purification of liquid metal will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1202995