Method for manufacturing alkali chromates from chromium ore

US5667759A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Rainer Bellinghausen · Neunburg vorm Wald, DE
• Heinrich Helker · Krefeld, DE
• Paul Strehlow · Leverkusen, DE
• Hans-Heinrich Moretto · Cologne, DE
• Bernhard Spreckelmeyer · Johannesburg, ZA
• Norbert Lonhoff · Leverkusen, DE
• Michael Batz · Leichlingen, DE
• Rainer Weber · Leverkusen, DE
• Hans Rinkes · Neunburg vorm Wald, DE
• Hans-Dieter Block · Cologne, DE
• Uwe Arndt · Cologne, DE

Key dates

• Filing date: Jul 26, 1996
• Grant date: Sep 16, 1997
• Expiry date: Jul 26, 2016

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C01G37/14
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

A method for the decomposition of chromium ore in a directly heated revolving tube is described, in which oxygen-containing gases are introduced into the revolving tube by means of below-bed nozzles.