Specialized metallurgical processes – compositions for use therei – Processes – Electrothermic processes
Patent
1981-11-18
1983-08-02
Rosenberg, P. D.
Specialized metallurgical processes, compositions for use therei
Processes
Electrothermic processes
75 21, 75 23, C22B 1300
Patent
active
043964265
ABSTRACT:
Lead is recovered from sulphidic lead raw-material containing impurities of the kind bismuth, arsenic, antimony and tin, by flame-smelting the material with an oxygen-containing gas. The oxygen potential and temperature are adapted during the flame-smelting process so that the product formed thereby comprises substantially a lead-sulphide melt substantially free of volatile, sulphidic and metallic impurities of the said kind. The lead-sulphide melt is brought into contact with an oxidic lead material substantially free of impurities of the aforementioned kind, while oxidizing the sulphide-sulphur content of the material and forming a melt substantially free of sulphur. Lead is recovered from the melt by separation, optionally after subjecting the melt or a part thereof to a reducing process.
REFERENCES:
patent: 3326671 (1967-06-01), Worner
patent: 3462265 (1969-08-01), Richards
patent: 3563726 (1971-02-01), Elvander
patent: 3663207 (1972-05-01), Themelis
patent: 3687656 (1972-08-01), Maelzer
patent: 3847595 (1974-11-01), Liang
patent: 3941587 (1976-03-01), Queneau
patent: 4080197 (1978-03-01), Meissner
patent: 4087274 (1978-05-01), Edenwald
Jensfelt Torsten E.
Petersson Stig A.
Boliden Aktiebolag
Rosenberg P. D.
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