Process for producing copper hydroxide

US4944935A · kind A · utility

Assignee

• Norddeutsche Affinerie Aktiengesellschaft

Inventors

• Bernd Langner · Winsen, DE
• Rene-Holger Wilde · Badendorf, DE

Key dates

• Filing date: May 18, 1988
• Grant date: Jul 31, 1990
• Expiry date: May 18, 2008

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C01P2006/60
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

A process of producing blue copper hydroxide, wherein copper metal is treated with an ammonium ion-containing aqueous solution with stirring and with a simultaneous introduction of an oxygen-containing gas and the reaction product is separated from the copper metal. A particulate, floatable copper (II) hydroxide is produced in that a material which contains copper metal is treated at a temperature of 0.degree. to 40.degree. with a solution which contains 0.1 to 10 g/l ammonium salt (calculated as NH.sub.4), 0 to 10 g/l ammonium hydroxide (calculated NH.sub.3) and, if desired, 0 to 5 g/l copper (II) salt and the resulting copper (II) hydroxide is separated.