Metallurgical apparatus – Means for melting or vaporizing metal or treating liquefied... – By means introducing treating material
Reexamination Certificate
2005-05-17
2005-05-17
Andrews, Melvyn (Department: 1742)
Metallurgical apparatus
Means for melting or vaporizing metal or treating liquefied...
By means introducing treating material
C266S233000, C266S236000, C266S900000, C266S901000, C222S603000
Reexamination Certificate
active
06893607
ABSTRACT:
A metal melting closed furnace which includes a main chamber, a circulation well connected to the main chamber by a communications passageway and a vortex well having a exit outlet for molten metal into the main chamber. A cover is emplaced over the vortex well. An inert gas bubble activated molten metal pump is provided in which there is an entry port in the circulation well and exit port into the vortex well. The exit port is positioned to lie at least partially or entirely above the maximum level of molten metal in the vortex well. This exit port will typically be at or near the top of the vortex well. In order to reduce oxidation, inert gas bubbles are captured from this molten metal pump and creating an inert gas atmosphere or blanket above the molten metal vortex.
REFERENCES:
patent: 3932173 (1976-01-01), Collin et al.
patent: 5211744 (1993-05-01), Areaux et al.
patent: 5984999 (1999-11-01), Areaux
patent: 6068812 (2000-05-01), Areaux et al.
Areaux Larry D.
Jackson Edward S.
Andrews Melvyn
Premelt Systems, Inc.
Sand & Sebolt
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