Dicyanoaurate(I) de potassium

Dicyanoaurate(I) de potassium
 
Formule chimique du dicyanoaurate(I) de potassium
Identification
No CAS 13967-50-5
No ECHA 100.034.303
No CE 237-748-4
PubChem 159710
ChEBI 30057
SMILES
InChI
Propriétés chimiques
Formule C2AuKN2KAu(CN)2
Masse molaire[1] 288,099 7 ± 0,002 1 g/mol
C 8,34 %, Au 68,37 %, K 13,57 %, N 9,72 %,
Précautions
SGH[2]
SGH06 : ToxiqueSGH09 : Danger pour le milieu aquatique
Danger
H300, H310, H330, H410, P260, P264, P273, P280, P284 et P301+P310
Transport[2]
-
   1588   

Unités du SI et CNTP, sauf indication contraire.

Le dicyanoaurate(I) de potassium est un composé chimique de formule K[Au(CN)2]. Il s'agit du sel de potassium K+ et de dicyanoaurate(I) [Au(CN)2], contenant 68,2 % d'or en masse. C'est un intermédiaire du procédé d'extraction de l'or par cyanuration au cyanure de potassium KCN[3] :

4 Au + 8 KCN + O2 + 2 H2O → 4 K[Au(CN)2] + 4 KOH.

L'or ainsi extrait par le dicyanoaurate est ensuite déplacé par le zinc pour être récupéré :

2 K[Au(CN)2] + Zn → K2[Zn(CN)4] + 2 Au.

Notes et références

  1. Masse molaire calculée d’après « Atomic weights of the elements 2007 », sur www.chem.qmul.ac.uk.
  2. a et b Fiche Sigma-Aldrich du composé Potassium dicyanoaurate(I) 99.95% trace metals basis, consultée le 10 mars 2017.
  3. (en) R. G. McDougall, G. J. Hancock, R. D. Nicol, M. J. Wellington, O. L. Copperthwaite, « The mechanism of the adsorption of gold cyanide on activated carbon », Journal of the Southern African Institute of Mining and Metallurgy, vol. 80, no 9,‎ , p. 344-356 (lire en ligne)

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