Process for recovering non-ferrous metals from industrial mineral residues
AssigneeVito NV
InventorsFrantisek Kukurugya, Liesbeth Horckmans, Jeroen Spooren
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Abstract
A process is described for recovering a non-ferrous metal from a first solid residue comprising iron. In this process, the first solid residue is mixed with a second solid residue including sulphur, thereby obtaining a particulate mixture. The particulate mixture is subjected to a roasting step at a temperature of at least 650° C. to obtain a roasted mixture, and the roasted mixture is subjected to leaching in a liquid at a pH of at least 5.5 to obtain a solution enriched with the non-ferrous metal.
Claims18
A process for recovering a non-ferrous metal from a first solid residue comprising iron, the process comprising:
- mixing the first solid residue with a second solid residue comprising sulfur thereby obtaining a particulate mixture,
- roasting the particulate mixture at a temperature of at least 650° C. to obtain a roasted mixture, and
- leaching the roasted mixture in a liquid at a pH of at least 5.5 to obtain a solution enriched with the non-ferrous metal,
- wherein the second solid residue comprises the non-ferrous metal, and
- wherein the particulate mixture comprises a stoichiometric ratio of sulfur to the non-ferrous metal of at least 8:1.
Dependencies are inferred from the claim text.