Specialized metallurgical processes – compositions for use therei – Processes – Free metal or alloy reductant contains magnesium
Reexamination Certificate
2005-02-07
2010-02-02
King, Roy (Department: 1793)
Specialized metallurgical processes, compositions for use therei
Processes
Free metal or alloy reductant contains magnesium
C075S385000, C075S672000
Reexamination Certificate
active
07655067
ABSTRACT:
The invention relates to a method for processing aluminum in a furnace consisting in introducing an aluminum-containing material and possibly one or several types of salt into the furnace, melting said material by heating with the aid of at least one burner supplied with a combustive material and fuel in such a way that a molten aluminum possibly covered with a slag containing, in particular alumina and at least one salt is produced and in measuring a carbon monoxide and/or hydrogen concentration in the furnace atmosphere or in a smoke at the exit of the furnace. Oxygen content in the combustive material supplying at least one burner is greater than 10% by volume, preferably greater than 21% by volume. The inventive method also involves a final phase of reduction of the molten aluminum oxydation during which the fuel flow rate is substantially constant while the injected combustive flow rate is controlled at a value ranging from 3 to 15% by volume which is greater than a CO concentration in the furnace and/or in the smoke without control.
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Lucas Nicolas
Zamuner Bernard
Cronin Christopher J.
King Roy
L'Air Liquide-Societe Anonyme a Directoire et Conseil de Surveil
Yang Jie
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