Specialized metallurgical processes – compositions for use therei – Processes – Free metal or alloy reductant contains magnesium
Reexamination Certificate
2008-08-12
2011-10-25
Wyszomierski, George (Department: 1733)
Specialized metallurgical processes, compositions for use therei
Processes
Free metal or alloy reductant contains magnesium
C075S694000, C075S770000
Reexamination Certificate
active
08043408
ABSTRACT:
A process and apparatus for producing lead and zinc from concentrates of zinc and lead sulfides or oxides includes the steps of:(a) mixing lead ore and/or zinc ore concentrates, iron bearing and carbon containing materials, metallic iron fines and iron oxide fines, carbonaceous reductant, fluxing agent, and a binder to form a mixture;(b) forming agglomerates from the mixture(c) introducing the agglomerates to a melting furnace;(d) maintaining a reducing atmosphere within the melting furnace;(e) vaporizing lead and zinc in the melting furnace at a temperature of 1000 to 1650 C, and removing the lead and zinc from the melting furnace in vaporized form;(f) cooling and condensing the metal vapors to liquid metal; and(g) separating the zinc and lead; and(h) recovering the lead and zinc metal separately.
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patent: 6699302 (2004-03-01), Jones et al.
patent: 2005/0183544 (2005-08-01), McPherson
patent: 2006/0096416 (2006-05-01), Nakai et al.
Cardero Resource Corporation
Dougherty Ralph H.
McGurthry Banks Tima M
Wyszomierski George
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