Raman study on the speciation of copper cyanide complexes in highly saline solutions

Lukey, Grant C.; Deventer, J.S.J. van; Huntington, S.T.; Chowdhury, Ratan; Shallcross, David

doi:10.1016/s0304-386x(99)00047-x

Cited by 74 publications

(41 citation statements)

References 20 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In the absence of other ligands (Fig. 7a), two absorption peaks were observed at 208 nm and 238 nm, which were assigned to the absorption of the Cu(CN) 3 2À [21,27]. No obvious change for the absorption peaks at the two wavelengths was observed before 30 min.…”

Section: Cu(cn)mentioning

confidence: 92%

“…Both CN À and Cu(CN) 3 2À concentrations were about 1.0 mM. Cu(CN) 3 2À solution was prepared by addition of cuprous cyanide powder to sodium cyanide solutions at a CN À /Cu(I) molar ratio of 4.0:1.0 [27]. The distribution of cuprous cyanide species was calculated with the program Visual MINTEQ 3.0 based on the equilibrium reactions and stability constants (Fig.…”

Section: Chemicalsmentioning

confidence: 99%

See 1 more Smart Citation

Enhanced destruction of Cu(CN)32− by H2O2 under alkaline conditions in the presence of EDTA/pyrophosphate

Chen

Zhao

Liu

et al. 2014

Chemical Engineering Journal

View full text Add to dashboard Cite

Section: Cu(cn)mentioning

confidence: 92%

Section: Chemicalsmentioning

confidence: 99%

Enhanced destruction of Cu(CN)32− by H2O2 under alkaline conditions in the presence of EDTA/pyrophosphate

Chen

Zhao

Liu

et al. 2014

Chemical Engineering Journal

View full text Add to dashboard Cite

“…The salinity, which consists mainly of sodium, chloride, magnesium, and sulfate (in order of decreasing molar concentration), causes a range of ionic strength effects including changes in the dissociation constant for hydrogen cyanide (Verhoeven et al, 1990) and changes in the stability constants for a range of cyano-complexes (Rees and Van Deventer, 1999). For copper, the more highly complexed species are favoured at higher ionic strengths (Lukey et al, 1999), and the same dependence may apply to cadmium and mercury cyano complexes, although to our knowledge this has not been confirmed.…”

Section: Mineralogy and Aqueous Solution Chemistrymentioning

confidence: 99%

Review of trace toxic elements (Pb, Cd, Hg, As, Sb, Bi, Se, Te) and their deportment in gold processing. Part 1: Mineralogy, aqueous chemistry and toxicity

et al. 2011

View full text Add to dashboard Cite

with further research based on gaps in the current knowledge of the thermodynamics and kinetics of these systems, will support the development of computer models to predict the chemical speciation and deportment of these elements through the various stages of the gold cyanidation process. The review covers lead, cadmium, mercury, arsenic, antimony, bismuth, selenium, and tellurium. Presented in this paper is the first part of this review which is a collation of the relevant information on trace element mineralogy, aqueous solution chemistry and toxicity.Although there is much information available about the aqueous solution chemistry of the trace elements, their chemistry in cyanide leach solutions remains largely unexplored. Chemical speciation modelling can assist in understanding the chemistry of the trace elements in gold cyanidation solutions, however, many significant differences exist between the predicted speciation of these trace elements for different types of modelling software. This is due to differences in the thermodynamic data used, the paucity of data that exists under appropriate non-ideal conditions, and the methods used by the software packages to estimate thermodynamic parameters under these conditions.The trace elements reviewed, particularly the species that exist in aqueous solutions, generally have significant toxicities to humans, and more so to plants and animals.Cadmium, mercury and arsenic are classified as human carcinogens whereas selenium is an essential trace element for human health, but is toxic in excess. This review

show abstract

“…Cu(CN) 3 2− solution was prepared through dissolution of cuprous cyanide in sodium cyanide solution with a molar ratio of Cu(I) to CN − of 1.0:3.0 according to a published procedure [19]. The water used for preparing and diluting the solutions was deionized water.…”

Section: Chemicalsmentioning

confidence: 99%

Enhancing destruction of copper (I) cyanide and subsequent recovery of Cu(I) by a novel electrochemical system combining activated carbon fiber and stainless steel cathodes

Chen

Sun

et al. 2017

Chemical Engineering Journal

View full text Add to dashboard Cite

A B S T R A C TMetal recovery is an attractive strategy for treatment of heavy metal wastewater. Heavy metal cyanide complexes are common pollutants in electroplating or mine industry wastewater, which usually hinder metal recovery due to the high stability of these complexes. A novel electrochemical system with activated carbon fiber and stainless steel combined cathodes was constructed for copper (I) cyanide (Cu(CN) 3 2− ) destruction and Cu(I) recovery. The destruction of cyanide was significantly improved by combining the stainless steel and activated carbon fiber cathodes due to the enhancement of electro-generated H 2 O 2 , which was promoted due to catalysis by copper deposited at the cathodes. Both the destruction of Cu(CN) 3 2− and recovery of Cu(I) at 75 min attained 95.0 ± 3.0%, which were higher than values obtained using stainless steel or activated carbon fiber as individual cathodes. The rate of Cu(CN) 3 2 destruction and Cu(I) recovery increased with increasing pH. The optimal current density was 50 A/m 2 , and higher current density caused more side reactions. Cu(CN) 3 2− was successively transformed into Cu(CN) 2 − , CNO − and Cu(I), and the liberated Cu(I) was recovered as Cu(0) on the stainless steel and activated carbon fiber electrodes.

show abstract

Raman study on the speciation of copper cyanide complexes in highly saline solutions

Cited by 74 publications

References 20 publications

Enhanced destruction of Cu(CN)32− by H2O2 under alkaline conditions in the presence of EDTA/pyrophosphate

Enhanced destruction of Cu(CN)32− by H2O2 under alkaline conditions in the presence of EDTA/pyrophosphate

Review of trace toxic elements (Pb, Cd, Hg, As, Sb, Bi, Se, Te) and their deportment in gold processing. Part 1: Mineralogy, aqueous chemistry and toxicity

Enhancing destruction of copper (I) cyanide and subsequent recovery of Cu(I) by a novel electrochemical system combining activated carbon fiber and stainless steel cathodes

Contact Info

Product

Resources

About