Specialized metallurgical processes – compositions for use therei – Processes – Free metal or alloy reductant contains magnesium
Patent
1994-03-28
1995-06-06
Andrews, Melvyn J.
Specialized metallurgical processes, compositions for use therei
Processes
Free metal or alloy reductant contains magnesium
75686, 75687, 75709, 266901, C22B 2100
Patent
active
054218560
ABSTRACT:
Dross formation in the aluminum melting and/or refining is avoided partially or totally by the method of this invention. The method is useful in unmodified open top furnaces. The elimination or reduction of dross formation is carried out throughout the body of molten aluminum by the installation of gas injection devices to extend through the refractory lining in the bottom of the furnace. For longer life without clogging metal cased refractories of the directional porosity type are used for gas injection. Mixtures of inert and hydrocarbon gases are used with respective proportions chosen to match the design parameters of different types of furnaces. In operation the dross is eliminated by reactions of the injected gases with the impurities of the molten aluminum batch at its hottest temperatures in the body of the aluminum mass to thereby reduce dross generally caused by oxidation of the molten aluminum within the molten mass. Furthermore the injected gases at a multiplicity of injection sites permeate the entire molten batch to eliminate dross formation accelerated by the high temperature of the molten aluminum. By continuous flow of the injected gases, the surface of the aluminum melt is dynamically kept free of oxygen that might form dross there without the necessity of using a closed top furnace with an atmosphere control system.
REFERENCES:
patent: 4907784 (1990-03-01), Kusaka et al.
patent: 5211744 (1993-05-01), Areaux et al.
Andrews Melvyn J.
Brown Laurence R.
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