Method for the valorisation of zinc-and sulphate-rich residue
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United States of America Patent
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Jan 24, 2012
Grant Date -
Jul 29, 2010
app pub date -
May 6, 2008
filing date -
May 24, 2007
priority date (Note) -
Expired
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Abstract
The present invention describes a method for treating residues comprising zinc ferrites and non-ferrous metals selected from among the group made up of lead (Pb), silver (Ag), indium (In), germanium (Ge) and gallium (Ga) or mixtures thereof in the form of oxides and sulfates, comprising the following steps: roasting of the residues in an oxidizing medium at elevated temperature in order to obtain a desulfurized residue, carburizing reduction/smelting of the desulfurized residue in a reducing medium, liquid phase extraction of carburized melt and slag, vapor phase extraction of the non-ferrous metals, followed by oxidation and recovery thereof in solid form.
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