IP Library Granted Patent US 8,641,997
Granted Patent B2
US 8,641,997 · App. 12/198,216 · Granted Feb 4, 2014

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

Inventors: Markus Jafeld (Frechen, DE); Stephan Schäflein (Haltern, DE); Norbert Steier (Euskirchen, DE); Annette Dickmann (Rodenbach, DE); Stefan Franke (Bad Vilbel, DE); Andreas Rubo (Leihgestern, DE); Manfred Sauer (Rodenbach, DE); Ernst Gail (Egelsbach, DE)
Assignee: CyPlus GmbH
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Quick Facts
Patent No.
US 8,641,997
App. No.
12/198,216
Granted
Feb 4, 2014
Kind
B2
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.

Claims (20)

1. Briquets of sodium cyanide comprising:

0.2 to 5 wt % of water,

0.2 to 0.7 wt % of sodium hydroxide,

0.1 to 0.4 wt % of sodium carbonate,

0 to 0.2 wt % of sodium formate, and

0 wt % of a shaping auxiliary,

wherein the briquets exhibit substantially no formate or ammonia formation and no undesired HCN polymerisation and no discoloration over three months of storage.

2. Briquets of sodium cyanide comprising:

0.2 to 5 wt % of water,

0.2 to 0.7 wt % of sodium hydroxide,

0.1 to 0.4 wt % of sodium carbonate,

0 to 0.2 wt % of sodium formate, and

0 wt % of a shaping auxiliary, and a breaking strength between 180 to 300 N.

3. Briquets of sodium cyanide consisting of:

sodium cyanide,

0.2 to 5 wt % of water,

0.2 to 0.7 wt % of sodium hydroxide,

0.1 to 0.4 wt % of sodium carbonate,

0 to 0.2 wt % of sodium formate, and

0 wt % of a shaping auxiliary.

Assignments (4)
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Mar 8, 2010
From: EVONIK DEGUSSA GMBH
To: CYPLUS GMBH
Reel/Frame 024045/0323 →
CHANGE OF NAME Recorded Mar 8, 2010
From: DEGUSSA GMBH
To: EVONIK DEGUSSA GMBH
Reel/Frame 024054/0169 →
CHANGE OF ENTITY Recorded Mar 8, 2010
From: DEGUSSA AG
To: DEGUSSA GMBH
Reel/Frame 024054/0184 →
CHANGE OF ADDRESS Recorded Mar 8, 2010
From: EVONIK DEGUSSA GMBH
To: EVONIK DEGUSSA GMBH
Reel/Frame 024054/0239 →
Priority Claims (1)
DE 100 06 862 · Feb 16, 2000 · national
Continuity (2)
Continuation 10203750
Related Publication 20080317655A1 · Dec 25, 2008