Recovery of chromium from scrap

US4259296A · kind A · utility

Assignee

• The United States of America, as represented by The Secretary of The Interior · US

Inventors

• Francis J. Hennion · Sussex, US
• John J. deBarbadillo · Barboursville, US
• Umar M. Ahmad · Middletown, US

Key dates

• Filing date: Dec 27, 1979
• Grant date: Mar 31, 1981
• Expiry date: Dec 27, 1999

Classification

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

Abstract

To recover chromium from scrap such as superalloy scrap, the feedstock is melted, subjected to controlled oxidation to oxidize and slag off reactive metals, then subjected to sulfidation and slow cooling to produce a coarse-grained solid wherein the bulk of the chromium is present in a phase consisting predominantly of a chromium sulfide.