On Electrochemical oxidation of thiocyanates in solutions for cyanidation of gold-containing ores and concentrates

Кенова, Т. А.; Kormienko, V. L.; Drozdov, S. V.

doi:10.1134/s1070427210090156

Cited by 9 publications

(6 citation statements)

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“…This cyanide formation is of interest in mining industries where waste waters and tailings with high concentrations of thiocyanate salts are generated during the cyanidation of sulfur-containing metal ores. Several technical oxidation processes have, therefore, been developed for the recycling of CN – from SCN – with the goal to minimize costly loss of cyanide during the treatment of the ores as well as to reduce deleterious effects of SCN – on aquatic ecosystems. , Also, in organisms, peroxidases can catalyze the oxidative degradation of thiocyanate to cyanide . Such peroxidase activities, for example, complicate the correct forensic analysis of human tissue − and disturb the relation of blood cyanide concentration with the amount of excreted hydrogen cyanide in breath .…”

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confidence: 99%

Potassium Thiocyanate as Source of Cyanide for the Oxidative α-Cyanation of Tertiary Amines

Wagner

Ofial

2015

J. Org. Chem.

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confidence: 99%

Potassium Thiocyanate as Source of Cyanide for the Oxidative α-Cyanation of Tertiary Amines

Wagner

Ofial

2015

J. Org. Chem.

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“…Thiocyanate (SCN − ) is a toxic contaminant in industrial wastewater streams associated with gold mining (Stott et al, 2001; Akcil, 2003; Kenova, Kormienko & Drozdov, 2010), steel production (Lay-Son & Drakides, 2008), photofinishing (Shukla et al, 2004), electroplating (Aguirre et al, 2010), herbicide and insecticide production (Hughes, 1975) and coal coking (Dash, Gaur & Balomajumder, 2009; Gould et al, 2012). In gold ore processing, SCN − is generated through reaction of cyanide (CN − ) with sulphide minerals and other intermediate valence sulphur species (Akcil, 2003).…”

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confidence: 99%

Biodegradation of thiocyanate by a native groundwater microbial consortium

Spurr

Watts

Gan

et al. 2019

PeerJ

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Gold ore processing typically generates large amounts of thiocyanate (SCN−)-contaminated effluent. When this effluent is stored in unlined tailings dams, contamination of the underlying aquifer can occur. The potential for bioremediation of SCN−-contaminated groundwater, either in situ or ex situ, remains largely unexplored. This study aimed to enrich and characterise SCN−-degrading microorganisms from mining-contaminated groundwater under a range of culturing conditions. Mildly acidic and suboxic groundwater, containing ∼135 mg L−1 SCN−, was collected from an aquifer below an unlined tailings dam. An SCN−-degrading consortium was enriched from contaminated groundwater using combinatory amendments of air, glucose and phosphate. Biodegradation occurred in all oxic cultures, except with the sole addition of glucose, but was inhibited by NH4+ and did not occur under anoxic conditions. The SCN−-degrading consortium was characterised using 16S and 18S rRNA gene sequencing, identifying a variety of heterotrophic taxa in addition to sulphur-oxidising bacteria. Interestingly, few recognised SCN−-degrading taxa were identified in significant abundance. These results provide both proof-of-concept and the required conditions for biostimulation of SCN− degradation in groundwater by native aquifer microorganisms.

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“…118,119 Već je od 1909. godine poznato da duhanski dim sadrži (SCN) 2 59. Prirodni ili antropogeni izvori kiselina HO 2 SCN i HO 3 SCN nisu poznati.…”

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