Combined process for working up pure and complex copper concentrates

US3969107A · kind A · utility

Assignee

• Duisburger Kupferhutte

Inventors

• Karl Lippert
• Herbert Kudelka · Duisburg, DE

Key dates

• Filing date: Jun 4, 1975
• Grant date: Jul 13, 1976
• Expiry date: Jun 4, 1995

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y02P10/20
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

A process for working up of a concentrate containing Cu, Zn, and precious metal including at least one of Ag or Au. In a first stage, the concentrate or the concentrate in modified form is leached for hydrometallurgically dissolving out the copper and zinc and leaving a residue containing the precious metal, and the leach liquor is separated from the residue. In a second stage, residue is subjected to a chlorinating sulfatizing roasting, and the roasted residue is leached with a selective solvent for the precious metal, e.g. aqueous NaCl, for dissolving the precious metal out of the residue.