Specialized metallurgical processes – compositions for use therei – Processes – Electrothermic processes
Patent
1981-08-03
1983-05-24
Andrews, M. J.
Specialized metallurgical processes, compositions for use therei
Processes
Electrothermic processes
75 93E, C22B 2106
Patent
active
043848885
ABSTRACT:
Molten metal, such as aluminum, is passed through a media of submerged contacting surfaces such as a filter bed. The contacting media is selected to provide a void fraction of at least one-half and a specific surface area of at least 50 sq. ft. per cubic ft. of media. The metal moving therethrough can be contacted with a gas. In the case of aluminum, the gas may be a nonreactive gas with or without a halogenaceous or chlorinaceous gas added thereto. The process removes solid, gas and metallic impurities from the molten metal and is capable of extremely long periods of operation without replacement of the contact media. Operating life is enhanced by periodic cleaning of the contact media by a high flow gas purge which disturbs the media to dislodge particles contained therein causing the particles to rise out of the media. Metal flow through the media is preferably curtailed during the purge.
REFERENCES:
patent: 2840463 (1958-06-01), Stroup et al.
patent: 3039864 (1962-06-01), Hess et al.
patent: 3737303 (1973-06-01), Blayden et al.
patent: 3737304 (1973-06-01), Blayden et al.
patent: 3737305 (1973-06-01), Blayden et al.
patent: 4277280 (1981-07-01), Montgrain
Aluminum Company of America
Andrews M. J.
Lippert Carl R.
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