Process for producing foamed slag

US8673047B2 · kind B2 · utility

Assignee

• SMS SIEMAG AG · DE

Inventors

• Johann Reichel · Mülheim an der Ruhr, DE
• Lutz Rose · Goldkronach, DE

Key dates

• Filing date: Jul 3, 2009
• Grant date: Mar 18, 2014
• Expiry date: Mar 3, 2030

Classification

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

Abstract

A process and material for producing foamed slag by which the foaming of a slag with a high chromium oxide content can be achieved. An electric arc furnace is charged with a mixture of metal oxides and carbon and, below the slag at the metal-slag interface, the metal oxide is reduced by carbon and limestone and becomes thermally discordant. The occurring gases cause the slag to foam due to the formation of bubbles.