Process for the extraction of non-ferrous metals from slags and other metallurgical by-products

US4214897A · kind A · utility

Assignee

• Metallurgie Hoboken-Overpelt · BE

Inventors

• Dirk Verhulst · Reno, US
• Robert H. Maes · Hove, BE
• Luc M. Fontainas · Ekeren, BE

Key dates

• Filing date: Jan 9, 1979
• Grant date: Jul 29, 1980
• Expiry date: Jan 9, 1999

Classification

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

Abstract

Non-ferrous metals are extracted from molten slags 9 by treating the latter in an electric furnace with submerged electrodes 2 under a layer of a solid reducing agent 8. During the extraction, a non-oxidizing gas is injected into the molten material at a flow rate of between 0.5 and 10 Nm3/h/ton of material treated (FIG. 1).