Zinc Cyanide

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  • Zinc cyanide is the inorganic chemical compound with the formula zn(cn)2. It adopts a polymeric structure consisting of tetrahedral zinc centers linked by bridging cyanide ligands.
  • It is a white solid that is used mainly for electroplating zinc but also has more specialized applications for the synthesis of organic compounds.
  • Zn(CN)2 is employed as a catalyst for the cyanosilylation of aldehydes and ketones.
  • It is also used to introduce the formal group in organic synthesis. 2-Hydroxy-1-naphthaldehyde       has been prepared from 2-naphthol, zinc cyanide, and anhydrous hydrogen chloride.
  • Zn(CN)2 is insoluble in most solvents. The solid dissolves in, or more precisely, is degraded by, aqueous solutions of basic ligands such as hydroxide, ammonia, and additional cyanide to give anionic complexes.
  • Zn(CN)2 is fairly easy to make because combining aqueous solutions of cyanide and zinc ions. For commercial applications, some effort is made to avoid halide impurities by using zinc acetates.
  •  Zinc cyanide is a byproduct of certain gold extraction methods. To isolate gold from aqueous gold cyanide, some procedures call for the addition of zinc
  • It is free from impurities and safe to use. It is fabricated using high quality material in accordance with the international quality standard.
  • It finds application in diverse industry and can be availed as per the specific requirement of the clients.
  • It adopts a polymeric structure consisting of tetrahedral zinc centers linked by bridging cyanide ligands.
  • The structure can also be described as being two interpenetrating adamantine structures.
  • The cyanide group shows head to tail disorder with any zinc atom having between 1 and 4 carbon neighbors and the remaining being nitrogen atoms it shows one of the largest negative coefficients of thermal expansion, beating the previous largest zirconium tungstate.
  • Zinc cyanide complex was found to be particularly acceptable due to it is preferred by the strong base resin groups to gold and silver complexes, it is readily decomposed by a mildly acidic solution so that zinc and cyanide ions removed while the resin is regenerated for further use, and zinc is a metal which is compatible with most cyanide circuits using the merrill-crowe technology. 
  • One of the first methods employed a zinc cyanide solution which is passed through a resin bed.
  • The rich solution obtained can be sent to a merrill-crowe process or electro winning, and the zinc cyanide solution can be recycled to elution. In this method all the anionic cyanide complexes are eluted efficiently and the resin can be regenerated to full capacity each cycle with efficient recycle of chemicals.
  • A method of removing complexed zinc-cyanide from wastewater involving a multiple stage process including, in a first step, control of ferrous ions to a critical minimum concentration of 250 to  400ppm, together with pH control in the first and also a second step, together with recycling of a portion of sludge precipitated in the process.
  • Improved sludge stability is achieved by aeration to oxidize precipitated ferrous hydroxide to ferric hydroxide, immediately before settling the sludge in a thickener.

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