Specialized metallurgical processes – compositions for use therei – Processes – Electrothermic processes
Patent
1983-03-16
1984-06-26
Stallard, W.
Specialized metallurgical processes, compositions for use therei
Processes
Electrothermic processes
75 68R, 75 72, 75 82, 75 84, 266211, C22B 904
Patent
active
044564791
ABSTRACT:
Molten metals having a low vapor pressure, such as aluminum, are vacuum refined to remove metallic impurities employing a lifting gas to form a metal fall above a liquid metal surface; a vacuum above the metal surface is effective in conjunction with the lifting gas, to develop a bulk flow of rising gases between the liquid metal surface and a condenser; the pressure is higher, i.e. lower effective vacuum, than that which would cause such bulk flow in the absence of the lifting gas; a molten metal such as copper may be vacuum refined by creating a vacuum effective to cause emission from the liquid copper surface of the metallic impurities as a bulk flow of rising gases, in particular lifting the liquid copper from a lower level to at least the metal surface creates a circulation within the mass of copper effective to promote transfer of metallic impurities to the metal surface.
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Davenport William G.
Harris Ralph
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