Specialized metallurgical processes – compositions for use therei – Processes – Electrothermic processes
Patent
1977-05-18
1978-07-18
Andrews, M. J.
Specialized metallurgical processes, compositions for use therei
Processes
Electrothermic processes
C22B 1300
Patent
active
041013140
ABSTRACT:
A process of recovery of lead from a lead sulfide concentrate. In this process, a furnace charge is prepared comprising the lead concentrate, a source of elemental iron and a source of available oxygen capable of reacting with the sulfur of the concentrate to form an oxysulfide matte. The relative proportions of the concentrate, source of elemental iron and source of oxygen are such that the sum of the elemental iron content and sulfur-reducible iron content of the charge is at least about 1.1 pound atoms per pound atom of sulfur based on the total sulfur content of the charge, and the oxygen source provides between about 0.25 and about 0.5 pound atoms available oxygen per pound atom of sulfur based on the total sulfur content of the charge. The charge is heated to a temperature of at least about 1,050.degree. C. and maintained at such temperature to effect reduction of lead sulfide with elemental iron, while limiting access of air to the charge to substantially prevent formation of sulfur dioxide therein. Thus, the formation of elemental lead and a matte containing partially oxygenated iron sulfide occurs without substantial evolution of sulfur dioxide. The elemental lead is separated from the matte.
REFERENCES:
patent: 821330 (1906-05-01), Betts
patent: 1306942 (1919-06-01), Berglund
patent: 1642358 (1927-09-01), Chisholm
patent: 2733989 (1956-02-01), Greffe
patent: 2823990 (1958-02-01), Barwasser et al.
patent: 2850375 (1958-09-01), Bertrand
Matsukawa et al., Tech Report of Osaka U. Japan, No. 272, Oct. 1957.
Andrews M. J.
The Curators of the University of Missouri
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