Method for producing shaped inorganic cyanide bodies and...

C - Chemistry – Metallurgy – 01 – C

Patent

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Details

C01C 3/08 (2006.01) C01C 3/10 (2006.01)

Patent

CA 2398115

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.

L'invention concerne un procédé de fabrication d'agglomérés de cyanures inorganiques, en particulier de cyanures de métaux alcalins et de métaux alcalinoterreux, par compression d'un cyanure inorganique en forme de particules obtenu par un processus de cristallisation. L'invention est caractérisée en ce qu'un cristallisat de cyanure, isolé d'une liqueur mère au cours d'une cristallisation, au moyen d'un dispositif de séparation solide-liquide, et d'une teneur en eau totale de 2 à 15 % en poids, est introduit, sans addition d'un auxiliaire de formage, dans un dispositif de mise en forme et est compressé, sous pression, en agglomérés de teneur en eau comprise entre 0,1 et 12 % en poids, et en ce que la teneur en eau des agglomérés est constamment inférieure à celle du cristallisat utilisé pour sa fabrication. De préférence, le cristallisat provenant d'un filtre à tambour ou d'une centrifugeuse est compressé, à une température supérieure à 40 ·C, en agglomérés de teneur en eau résiduelle de 0,2 à 6 % en poids. Le procédé est mis en oeuvre de façon plus rentable que les procédés connus utilisant du cyanure séché. L'invention concerne également des agglomérés de cyanures organiques, produits selon ledit procédé

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