Process for preparation of alkali metal cyanide granulates

US5914075A · kind A · utility

Assignee

• Degussa AG · DE

Inventors

• Herbert Riemenschneider · Gelnhausen, DE
• Christian Alt · Coburg, DE
• Martina Claus · Frankfurt, DE
• Juergen Loroesch · Hanau, DE
• Josef Leutner · Alzenau, DE
• Heinz Moench · Zeven, DE
• Ruediger Schuette · Alzenau, DE
• Stefan Schulze · Hessisch Oldendorf, DE

Key dates

• Filing date: Dec 27, 1996
• Grant date: Jun 22, 1999
• Expiry date: Dec 27, 2016

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C01P2006/80
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

New alkali metal cyanide granulates based on sodium cyanide or potassium cyanide and a method for their preparation are disclosed. Commercially available alkali metal cyanide granulates consist of irregular particles; disadvantages are in particular the tendencies to form dust and to cake. The disclosed alkali metal cyanide granulates demonstrate a reduced tendency to cake and virtually no abrasion. The granulates are characterized by essentially spherical particles with particle diameters in the range 0.1 to 20 mm, a bulk density of more than 600 g/dm.sup.3, an abrasion of less than 1%, and a caking index of at most 4. The granulates can be prepared by fluidized bed spray granulation involving spraying an aqueous solution containing alkali metal cyanide onto alkali metal cyanide nuclei in a fluidized bed and evaporating the water.