Specialized metallurgical processes – compositions for use therei – Processes – Producing or treating free metal
Patent
1994-09-07
1995-08-01
Andrews, Melvyn
Specialized metallurgical processes, compositions for use therei
Processes
Producing or treating free metal
75628, 75669, 266 87, 266148, 266157, 266205, C22B 700
Patent
active
054377056
ABSTRACT:
A process and device for recovering cadmium and nickel metals from Ni-Cd battery and processing scrap material containing nickel, cadmium, iron and other substances are disclosed. The process includes depositing the scrap material in a furnace and adding an effective amount of an oxygen getter in the furnace to prevent oxide formation. Argon or nitrogen gas is introduced and maintained in the atmosphere of the furnace. The furnace is then heated for an effective period of time to evaporate free water. The temperature of the furnace is then increased and maintained to approximately 500.degree.-800.degree. C. for an effective period of time to volatilize molecular water and non-metallic substances. The temperature of the furnace is then further raised to greater than approximately 900.degree. C. for an effective period of time to vaporize cadmium from the scrap material. The vaporized cadmium is directed to a chamber connected with the furnace and is condensed and solidified in a mold disposed within the chamber by decreasing the temperature of the cadmium vapor. The solidified cadmium is then recovered, and a nickel-iron residue is also recovered from inside the furnace.
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DeLisle Ralph J.
Martin Harold E.
Wilkerson Amos
Andrews Melvyn
Cooper Richard C.
Eveready Battery Company Inc.
Welsh Robert W.
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