Method of protective atmosphere heating

Details Method of protective atmosphere heating Method of protective atmosphere heating

1998-03-03

1999-10-05

Andrews, Melvyn

Specialized metallurgical processes, compositions for use therei

Processes

Producing or treating free metal

75 1045, 75594, 75654, 75686, 75687, 266901, 373 22, C21B 1300, C22B 2100, C22B 2600

Patent

active

059616890

ABSTRACT:
A method for heating and/or melting a charge such as aluminum in a furnace using heat generated by combustion to radiatively heat the charge through a layer of protective gas wherein combustion reaction products generated by the combustion are exhausted from a lower level within the furnace, and, during melting, the protective gas layer has a higher upper boundary than during a subsequent heating period, enabling reduced NO.sub.x generation, lower fuel and oxygen consumption and reduced refractory corrosion by avoiding furnace gas flow through the high temperature upper furnace region.

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patent: 5609481 (1997-03-01), Kobayashi

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