Specialized metallurgical processes – compositions for use therei – Processes – Free metal or alloy reductant contains magnesium
Reexamination Certificate
2004-08-30
2010-10-19
Wyszomierski, George (Department: 1793)
Specialized metallurgical processes, compositions for use therei
Processes
Free metal or alloy reductant contains magnesium
C075S010220, C075S010470, C075S010500, C075S010290, C075S961000
Reexamination Certificate
active
07815708
ABSTRACT:
The invention relates to a process for the separation and recovery of non-ferrous metals from zinc-bearing residues, in particular from residues produced by the zinc manufacturing industry. The process comprises the steps of: —subjecting the residue to a flash or agitated bath fuming step, thereby producing an Fe bearing slag and Zn- and Pb-bearing fumes; and —extracting the Zn- and Pb-bearing fumes and valorising Zn and Pb; characterised in that CaO, SiO2and MgO are added as a flux before or during the fuming step so as to obtain a final slag composition with: formula (I) all concentrations being expressed in wt %. The invention also relates to a single-chamber reactor for Zn-fuming equipped with one or more submerged plasma torches as heat and gas sources.[Fe][SiO2]+[CaO][SiO2]+[MgO]3>3.5;0.1<[CaO][SiO2]<1.3;and6<[SiO2]<22,(I)
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Aerts Jonathan
Janssens Benedict
Santen Sven
Van Camp Maurits
Brinks Hofer Gilson & Lione
McGuthry-Banks Tima M
Umicore
Wyszomierski George
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