Decontamination and/or surface treatment of metals

Details Decontamination and/or surface treatment of metals Decontamination and/or surface treatment of metals

C - Chemistry, Metallurgy

22

B

53/236, 53/354,

C22B 7/00 (2006.01) C21D 1/53 (2006.01) C22B 1/00 (2006.01) C22B 21/00 (2006.01) C23G 5/00 (2006.01)

Patent

CA 2021638

A process of decontaminating metal (especially aluminum or aluminum alloy) scrap contaminated with organic material is provided. The process involves heating the scrap in a fluidized bed of solid particles fluidized by a fluidizing gas to a decontaminating temperature high enough to consume the organic material but below the melting point of the metal. The heating step is carried out in the presence of a protective material which protects the aluminum or aluminum alloy against substantial oxidation while the scrap is held in the bed at the decontaminating temperature. Preferred protective materials include organic and inorganic fluorine- containing compounds. The process is particularly effective for the treatment of aluminum alloys containing magnesium, which are especially susceptible to oxidation. Scrap decontaminated in this way can be subjected to conventional metal recovery processes, e.g. metal melting, and provide high recovery rates of the metal. The process of the invention can also be used for protecting metal (particularly aluminum and alloys thereof) against excessive oxidation during heat treatments other than decontamination. The invention also relates to the treatment of briquettes of compacted scrap without the need for prior shredding or grinding.

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