Process for producing shaped articles of inorganic cyanides and products obtainable by the process

US8641997B2 · kind B2 · utility

Assignee

• Cyplus GmbH · DE

Inventors

• Markus Jafeld · Frechen, DE
• Stephan Schäflein · Haltern, DE
• Norbert Steier · Euskirchen, DE
• Annette Dickmann · Rodenbach, DE
• Stefan Franke · Bad Vilbel, DE
• Andreas Rubo · Linden, DE
• Manfred Sauer · Wilhelmshaven, DE
• Ernst Gail · Egelsbach, DE

Key dates

• Filing date: Aug 26, 2008
• Grant date: Feb 4, 2014
• Expiry date: Aug 21, 2030

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C01C3/08
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

The invention relates to a method for producing shaped inorganic cyanide bodies, especially made of alkaline metal cyanides and alkaline earth metal cyanides, by pressing particulate inorganic cyanide obtained by means of a crystallization method. According to the invention, a cyanide crystallate separated from a mother liquor by means of a solid-liquid separation device and containing 2-15 wt. % water is fed to a forming device without the addition of an auxiliary forming agent and placed under pressure and compressed to form shaped bodies containing 0.1-12 wt. % water. The amount of water contained by the shaped bodies is always less than that contained in the crystallates used for the production thereof. Preferably, the crystallite is pressed out of a rotary filter or a centrifuge at a temperature of more than 40° C. to form shaped bodies containing 0.2-6 wt. % residual water. The inventive method can be carried out in a more economical manner than previously known methods using dried cyanide. The invention also relates to shaped inorganic cyanide bodies obtained according to said method.