Elevated discharge gas lift bubble pump and furnace for use therewith
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United States of America Patent
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May 17, 2005
Grant Date -
Oct 23, 2003
app pub date -
May 16, 2003
filing date -
Sep 7, 2001
priority date (Note) -
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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.
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