Specialized metallurgical processes – compositions for use therei – Processes – Electrothermic processes
Patent
1976-06-30
1977-08-02
Andrews, M. J.
Specialized metallurgical processes, compositions for use therei
Processes
Electrothermic processes
75 78, 423 94, 423494, C22B 3700
Patent
active
040393232
ABSTRACT:
Bismuth is recovered as elemental bismuth or as a Pb-Bi alloy from an air-pervious residue cake of de-bismuthizing dross of concentrated alkaline bismuthide content, by heating the cake in air to the ignition temperature of the cake to ignite the cake, and burning autogenously in a flameless or substantially flameless combustion the thus-ignited cake to oxidize the alkali and a portion of the lead to the exclusion of the bismuth. A powder-like residue, formed by the burning, comprises bismuth, lead, lead oxide and alkali oxide. The lead oxide and alkali oxide of the residue are then selectively dissolved in an oxide-dissolving flux, e.g. molten lead chloride, and the flux containing the lead oxide and alkali oxide is skimmed from the resulting lead bismuthide alloy. The lead of the alloy can, if desired, be separated to recover elemental bismuth, for example, by reacting the Pb-Bi alloy in molten droplet or molten particulate form with Cl.sub.2 to form PbCl.sub.2, by electrolysis, or by blowing the molten Pb-Bi alloy with air in a cupel to form litharge which is skimmed off.
REFERENCES:
patent: 2056164 (1936-10-01), Betterton et al.
patent: 2133327 (1938-10-01), Jollivet
patent: 2204651 (1940-06-01), Betterton et al.
patent: 2213197 (1940-09-01), Betterton et al.
DiMartini Carl Richard
Scott William Lafayette
Andrews M. J.
ASARCO Incorporated
Drew R. J.
Schaffer E. J.
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