Specialized metallurgical processes – compositions for use therei – Processes – Producing or treating free metal
Patent
1993-12-01
1994-11-15
Andrews, Melvyn J.
Specialized metallurgical processes, compositions for use therei
Processes
Producing or treating free metal
75687, C22B 916, C22B 2100
Patent
active
053644433
ABSTRACT:
A method of recovering an aluminum-containing metal from a scrap material containing the metal and an organic contaminant, such as paper, plastics, lacquer, paint or oil. The method involves creating a fluidized bed of solid particles, maintaining a zone of the bed at a temperature in the range of the melting point of the metal to 1000.degree. C., introducing the scrap material into the fluidized zone to cause decoating of the metal within a time in the range of 1 to 40 seconds, at least partially melting the metal, and removing the metal material from the fluidized bed. In this way, decoating and at least partial melting is achieved essentially at the same time for improved efficiency. Metals of different melting point may also be separated from each other by providing a series of temperature zones in the fluidized bed (or in a series of fluidized beds) of progressively increasing temperature. If a limited amount of oxygen is introduced into the bed, a combustible gas is produced that can be burned to extract its energy or can be stored for later use.
REFERENCES:
patent: 4365993 (1982-12-01), Meredith et al.
patent: 4508564 (1985-04-01), Kennedy
patent: 4955587 (1990-09-01), Sulzbacher et al.
patent: 5122181 (1992-06-01), Dube et al.
Alcan Research Disclosure 33599 Mar. 1992.
Dube Ghyslain
Fortin Jean-Yves
Lavoie Serge
Tremblay Francois
Tremblay Sylvain P.
Alcan International Limited
Andrews Melvyn J.
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