Treating molten aluminum

C - Chemistry – Metallurgy – 22 – B

Patent

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53/246, 53/269

C22B 21/06 (2006.01) C22B 9/05 (2006.01)

Patent

CA 1198595

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 dis- lodge particles contained therein causing the particles to rise out of the media. Metal flow through the media is preferably curtailed during the purge.

408468

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