C - Chemistry – Metallurgy – 22 – B
Patent
C - Chemistry, Metallurgy
22
B
53/331
C22B 13/02 (2006.01)
Patent
CA 1157665
1574 LOW TEMPERATURE, NON-SO2 POLLUTING, KETTLE PROCESS FOR SEPARATION OF LEAD FROM LEAD SULFIDE-CONTAINING MATERIAL ABSTRACT OF THE DISCLOSURE Lead is separated from material containing lead sul- fide, e.g. galena ore concentrate, by a substantially auto- genous 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 com- bined 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 con- taining 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°C., and does not discharge polluting SO2 into the atmosphere.
373450
Bulvanoski Leo J.
Di Martini Carl R.
Howe Herbert E.
Scott William L.
Asarco Incorporated
Hewitt Neville S.
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