Investigation of complexation and solubility equilibria in the copper(I)/cyanide system at 25°C

C. Akilan; E. Königsberger; J.S. Solis; P.M. May; J.H. Kyle; G. Hefter

doi:10.1016/j.hydromet.2016.05.020

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Investigation of complexation and solubility equilibria in the copper(I)/cyanide system at 25°C

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Investigation of complexation and solubility equilibria in the copper(I)/cyanide system at 25°C

C. Akilan, E. Königsberger, J.S. Solis, P.M. May, J.H. Kyle and G. Hefter

Hydrometallurgy, Vol.164, pp.202-207

2016

DOI: https://doi.org/10.1016/j.hydromet.2016.05.020

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Abstract

The complexation of copper(I) by cyanide ions (CN−) in aqueous solution has been studied by glass electrode potentiometry at 25 °C and ionic strengths (I) of 1, 3 and 5 M in NaCl media. Overall formation constants, βn, for the equilibria: Cu+(aq) + nCN−(aq) ⇌ Cu(CN)n(n − 1)−(aq) with n = 2, 3 and 4, were quantified, along with the ionization constant (Kw) of water and the acid dissociation constant (Ka) of HCN(aq). The solubility constants *Ksn for the equilibria: CuCN(s) + (n − 1)HCN0(aq) ⇌ Cu(CN)n(n − 1)−(aq) + (n − 1)H+(aq) were also determined from a re-analysis of published solubility data for CuCN(s) in acidic cyanide solutions at I = 1 M(NaCl) and 25 °C. Because of the instability of uncomplexed Cu+(aq) and parameter correlations in the data, neither β1 nor the solubility product Ks0 (CuCN(s) ⇌ Cu+(aq) + CN−(aq)) could be reliably determined from the present data although estimates are presented.

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Title: Investigation of complexation and solubility equilibria in the copper(I)/cyanide system at 25°C
Authors/Creators: C. Akilan (Author/Creator) - Cooperative Research Centre
E. Königsberger (Author/Creator) - Murdoch University
J.S. Solis (Author/Creator) - Murdoch University
P.M. May (Author/Creator) - Murdoch University
J.H. Kyle (Author/Creator) - Murdoch University
G. Hefter (Author/Creator) - Murdoch University
Publication Details: Hydrometallurgy, Vol.164, pp.202-207
Publisher: Elsevier BV
Identifiers: 991005542941807891
Murdoch Affiliation: Parker Cooperative Research Centre for Integrated Hydrometallurgy Solutions; School of Engineering and Information Technology
Language: English
Resource Type: Journal article

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Citation topics: 7 Engineering & Materials Science; 7.229 Mineral & Metal Processing; 7.229.774 Bioleaching
Web Of Science research areas: Metallurgy & Metallurgical Engineering
ESI research areas: Materials Science