Specialized metallurgical processes – compositions for use therei – Processes – Producing or treating free metal
Patent
1996-02-06
1998-08-04
Andrews, Melvyn
Specialized metallurgical processes, compositions for use therei
Processes
Producing or treating free metal
75693, 423621, 429 49, C22B 700, C22B 1300
Patent
active
057887390
ABSTRACT:
The present invention relates to a process for the recovery of metallic lead from exhausted lead-acid batteries. According to the invention, the metallic scrap obtained thereof is treated by a smelting operation which is carried out under a layer of a molten flux. The flux comprises alkali hydroxide and optionally also carbonate(s) and sulfate(s) of said alkali. The temperature which is maintained during the smelting is between 350.degree. C. to 600.degree. C. and most preferably in the range of between 450.degree. C. to 550.degree. C. The preferred weight ratio between the metallic scrap and the flux is between 15 to 45. Generally, the alkali flux is selected from sodium hydroxide and potassium hydroxide and mixtures thereof. The process is characterized by a very extent of lead recovery compared with the known processes and absence of exhausted gases.
REFERENCES:
patent: 4058396 (1977-11-01), Birk
patent: 4927510 (1990-05-01), Ol per et al.
patent: 5242482 (1993-09-01), Cangini et al.
"Recycling Lead and Zinc: The Challenge of the 1990's" by R. David Prengaman, Transaction of International Conference, Rome, Italy, Jun. 11-13, 1991.
Andrews Melvyn
Margulead Ltd.
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