Specialized metallurgical processes – compositions for use therei – Processes – Electrothermic processes
Patent
1991-11-13
1993-03-23
Rosenberg, Peter D.
Specialized metallurgical processes, compositions for use therei
Processes
Electrothermic processes
C22B 400
Patent
active
051960478
ABSTRACT:
The present invention relates to a method for treatment of zinc-containing by-products and waste materials from primary and secondary production of nonferrous metals and especially zinc- and leadcontaining slags from the production of lead. The by-products and the waste materials are supplied to a gastight closed electric smelting furnace in which the materials are melted and subjected to a selective metallothermic reduction in order to reduce and volatilize zinc and other volatile metals. Elemental sulphur and/or sulphur compounds are added to the smelting furnace in an amount sufficient to form a sulphide phase containing one or more of the elements Cu, Ni, Pb, As, Bi, Sb and Ag. An inert slag phase and the sulphide phase are tapped from the furnace, and zinc and other volatile metals are recovered from the off-gas from the furnace by condensation.
REFERENCES:
patent: 4135912 (1979-01-01), Matthew et al.
patent: 4571261 (1986-02-01), Buren et al.
patent: 4606760 (1986-08-01), Fritz
patent: 4957551 (1990-09-01), Aune
patent: 5004496 (1991-04-01), Aune
Ushakov et al., "Processing of Slags of Heavy Non-ferrous Metals", Tsvetn. Met., Mar. 1984 (3), pp. 27-30 Abstract Only.
Elkem Technology a/s
Rosenberg Peter D.
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