Specialized metallurgical processes – compositions for use therei – Processes – Electrothermic processes
Patent
1983-03-21
1985-06-04
Andrews, M. J.
Specialized metallurgical processes, compositions for use therei
Processes
Electrothermic processes
C22B 1300
Patent
active
045212473
ABSTRACT:
Lead is separated from material containing lead sulfide, e.g., galena ore concentrate, by a substantially autogenous process involving establishing a pool of molten lead in a kettle, adding a metallic alkali metal, e.g., metallic sodium, to the molten lead in an amount sufficient to reduce the combined lead of the lead sulfide to metallic lead, adding the ore concentrate to the molten lead pool, and mixing together the metallic sodium, molten lead and ore concentrate. The sodium reacts rapidly and exothermically with the lead sulfide to reduce the combined lead of the lead sulfide to metallic lead and form sodium sulfide. The thus-liberated metallic lead reports in the molten lead pool, and a matte phase containing the sodium sulfide separates from the molten lead and forms on the surface of the molten lead pool. Lead sulfide from an excess of the ore concentrate, or other suitable added flux, which is usually added to the molten lead pool, serves to flux the sodium sulfide-containing matte phase to attain desired fluid and low melting characteristics of the matte phase. The process herein employs a kettle as the reactor, ordinarily the steel refining kettle of a lead refinery, is a low temperature process requiring temperatures above the melting point of lead but ordinarily not above 650.degree. C., and does not discharge polluting SO.sub.2 into the atmosphere.
REFERENCES:
patent: 599310 (1898-02-01), Angel
patent: 816772 (1906-04-01), Betts
patent: 816773 (1906-04-01), Betts
patent: 821330 (1906-05-01), Betts
patent: 882193 (1908-03-01), Francis
patent: 1786908 (1930-12-01), Hanak
patent: 2110445 (1938-03-01), Leferrer
patent: 2365177 (1944-12-01), Dittmer
patent: 2691575 (1954-10-01), Larson
patent: 4033761 (1977-07-01), Di Martini et al.
patent: 4057422 (1977-11-01), Swanson
patent: 4153451 (1979-05-01), Crasto et al.
patent: 4333763 (1982-06-01), Di Martini et al.
Bulvanoski Leo J.
Di Martini Carl R.
Howe Herbert E.
Scott William L.
Andrews M. J.
ASARCO Incorporated
Koch Kenneth A.
Tomaszewski John J.
LandOfFree
Low temperature, non-SO.sub.2 polluting, kettle process for sepa does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Low temperature, non-SO.sub.2 polluting, kettle process for sepa, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Low temperature, non-SO.sub.2 polluting, kettle process for sepa will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-827188