Cyanide and removal options from effluents in gold mining and metallurgical processes

Kuyucak, Nural; Akçıl, Ata

doi:10.1016/j.mineng.2013.05.027

Cited by 305 publications

(162 citation statements)

References 21 publications

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“…In this sense, the produced cyanate is several hundred times less toxic than cyanide [15,16,45]. This compound can be further electroxidized by extending the electrolysis time and by using suitable conditions.…”

Section: Electrolysis Performance and Electro-oxidation Kineticsmentioning

confidence: 99%

Electrocatalytic oxidation of cyanide on copper-doped cobalt oxide electrodes

Berenguer

Rosa-Toro

Quijada

et al. 2017

Applied Catalysis B: Environmental

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Copper and copper oxides are well-known excellent catalysts in several chemical processes, but their low mechanical and electrochemical stability restrict their direct utilization as electrodes in electrolytic processes. In this work, the incorporation of copper into cobalt oxide (Cu x Co 3-x O 4 ) is presented as an excellent approach to obtain highly active and robust copper-based electrocatalysts. Particularly, the electrocatalytic performance of Ti-supported Cu x Co 3-x O 4 electrodes (with 0 ≤ x ≤ 1.5) has been studied for the oxidation of cyanide in alkaline media.Cyclic voltammetry and electrolysis runs show an outstanding effect of Cu on the activity, efficiency and kinetics of spinel Cu x Co 3-x O 4 electrodes for CN − electro-oxidation. Despite being active oxides with high activity towards water oxidation, copper saturated (x = 1.0) and oversaturated (x = 1.5) spinels exhibit unprecedented 100 % current efficiencies for the electrooxidation of CN − in aqueous electrolyte. In-situ surface enhanced Raman spectroscopy (SERS) reveals the specific adsorption of CN − ions on surface Cu species to be involved in the electrocatalytic oxidation mechanism. This electrocatalytic activity has been attributed to surface Cu(II) in the spinel lattice. Furthermore, the Cu x Co 3-x O 4 electrodes also display high

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Section: Electrolysis Performance and Electro-oxidation Kineticsmentioning

confidence: 99%

Electrocatalytic oxidation of cyanide on copper-doped cobalt oxide electrodes

Berenguer

Rosa-Toro

Quijada

et al. 2017

Applied Catalysis B: Environmental

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“…Bulk occurrence of cyanide in the environment is attributed to the human operations in industries, metallurgical and mining activities. Cyanide is mainly produced industrially in form of hydrogen cyanide gas or solid sodium cyanide or potassium cyanide [22].…”

Section: Occurrence Of Cyanide In Environmentmentioning

confidence: 99%

“…Ferri-and ferrocyanide complexes are extremely stable under most environmental conditions except when exposed to ultraviolet radiation [22]. Zinc and copper cyanide complexes are relatively unstable and can release free cyanide to the environment.…”

Section: Natural Degradation Of Cyanidementioning

confidence: 99%

Review of the Impact on Water Quality and Treatment Options of Cyanide Used in Gold Ore Processing

Nyamunda¹

2017

Water Quality

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Cyanide has been widely used in several industrial applications such as electroplating photography, metal processing, agriculture, food and the production of organic chemicals, plastics, paints and insecticides. The strong affinity of cyanide for metals such as gold and silver makes it suitable for selective leaching of these metals from ores. Cyanide is highly toxic; hence, there is a need to regulate and limit the amount of cyanide that may be discharged into the environment. Technologies focusing on the use of physical, chemical and biological methods have been developed to reduce the concentration of cyanide and cyanide compounds in wastewaters to permissible limits. This chapter reviews the current and emerging technologies for treatment of cyanide from wastewaters generated in gold mining processes.

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“…Cyanide is produced by a number of fruits, seeds, leaves, and roots of various plants such as cassava, a number of soil bacteria, fungi, and various species of invertebrates [1,2]. Nevertheless, industrial wastes of human activities contribute the largest portion of environmental cyanide pollution [3,4]. The most important application of cyanide is in the mining of precious metals (e.g.…”

Section: Introductionmentioning

confidence: 99%

“…Gold and silver are precious metals that are insoluble in water. Instead , that require an alkaline environment (pH > 10) to keep cyanide in its ionic form and prevent the formation of volatile toxic hydrogen cyanide [3].…”

Section: Introductionmentioning

confidence: 99%