Thiocyanate solutions in gold technology

Kholmogorov, A. G.; Кононова, О. Н.; Пашков, Г. Л.; Kononov, Yu. S.

doi:10.1016/s0304-386x(02)00005-1

Cited by 58 publications

(31 citation statements)

References 2 publications

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“…The choice of these sorbents was due to their promising characteristics for recovery of gold or silver ions from different solutions in our previous investigations. 4,[10][11][12] The initial stock solutions were prepared from an accurately weighed samples of HAuCl 4 and AgNO 3 (analyt-ical pure grade). Their concentrations were 0.03 mol/L and 0.05 mol/L, respectively.…”

Section: Methodsmentioning

confidence: 99%

“…23,26 The information about application of ion exchangers for this purpose is absent, though selective organic resins possess high exchange capacity and complexforming ability during recovery of noble metal ions. 4,[10][11][12] That is why the present paper is devoted to simultaneous sorption concentration of gold (III) and silver (I) ions from thiocyanate solutions and their subsequent separation by elution as well as to gold determination in the resin phase by diffuse reflectance spectroscopy.…”

Section: Introductionmentioning

confidence: 99%

“…Such reagents are thiocyanate, thiosulfate and thiocarbamide solutions. [4][5][6][7][8] The application of sorption methods together with leaching allows to obtain solutions with high contents of noble metals. 4,[9][10][11][12] However, because of high selectivity of sorbents to gold and silver ions, the separation of these ions after sorption and their subsequent analytical determination are rather hindered.…”

Section: Introductionmentioning

confidence: 99%

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Sorption and Separation of Thiocyanate Gold and Silver Complexes and Determination of Gold by Diffuse Reflectance Spectroscopy

Danilenko¹,

Кононова²,

Kachin³

et al. 2004

Bulletin of the Korean Chemical Society

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The present paper is focused on simultaneous sorption concentration of gold (III) and silver (I) from thiocyanate solutions using high-selective anion exchanger AN-25 and subsequent separation of these ions at various concentrations of thiocarbamide (eluent). As a result, silver (I) ions are completely eluted from AN-25 and gold (III) ions remain in the resin phase and can be determined directly in the solid phase by diffuse reflection spectroscopy. It is proposed to use the sorption-spectroscopic method for Au(III) determination in aqueous solutions. The calibration curve is linear in the concentration range of 1-19 mg/L (sample volume is 10.0 mL) and the detection limit is 0.05 µg/mL. The presence of Cu(II), Co(II), Fe(II) do not hinder this determination. Au(III) was determined in industrial solutions.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Sorption and Separation of Thiocyanate Gold and Silver Complexes and Determination of Gold by Diffuse Reflectance Spectroscopy

Danilenko¹,

Кононова²,

Kachin³

et al. 2004

Bulletin of the Korean Chemical Society

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“…티오요소는 Au를 용출시킬 때, 용출초기에 Au가 매우 빠르게 용해되고 낮은 독성으로 인하여 많이 사용되었지만, 매우 불안정하여 쉽게 분해되는 단점이 있다 (Urbanski et al, 2000). 그리고 티오시안 산염은 낮은 독성과 매우 높은 안정성(stability)을 보 이지만, Au가 매우 느리게 용해되는 단점이 있다 (Kholmogorov et al, 2002;Li et al, 2012). 이렇게 Au 용매제에는 극복하기 어려운 단점들을 갖고 있지 만, 이들 용매를 서로 혼합하여 사용하면 단점들이 극복되면서 상승효과를 동시에 얻을 수 있다 (Yang et al, 2010a(Yang et al, , 2010b(Yang et al, , 2011.…”

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Enhancement of Au·Ag Leaching by Mechanochemical Activation and Thiourea-Thiocyanate Mixing Solution

You¹,

Park²

2014

Journal of the Korean earth science society

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In order to enhance the Au · Ag leach rate, a mechanochemical activation process and a mixed thioureathiocyanate solution has been applied to Au concentrate. To achieve mechanochemical activation, the Au concentrate was mechanically ground using a dry and a wet process. The results of a particle size distribution analysis and an XRD analysis, average particle size and crystallite size were much smaller in the dry-sample than in the concentrate sample. As well the size was smaller in the wet-sample than in the dry-sample. In SEM and XRD analysis, the amorphization effect was observed in the wet-sample due to mechanochemical activation. Au · Ag leaching experiments were carried out with a thiourea solution, a thiocyanate solution and a mixed thiourea-thiocyanate solution. The Au · Ag leach rate was much greater in the dry-ground-sample than in the concentrate sample, and the leach rate was greater in the wet-ground-sample than in the dry-sample. The Au · Ag leach rate was much greater in the thiocyanate solution than in the thiourea solution, and the leaching rate was much greater in the mixed thiourea-thiocyanate solution than in the thiocyanate solution. Up to a 99% leach rate for Au · Ag were only achieved in the wet-sample using the mixed thiourea-thiocyanate leaching solution.

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“…[16][17][18][19][20][21][22][23][24] Among these lixiviants, thiosulfate has been suggested as the best cyanide substitute. [25][26][27][28][29][30][31][32] Thiosulfate (S 2 O 3 2À ) is the least toxic and cheapest chemical which can stabilize gold in aqueous solution.…”

Section: Introductionmentioning

confidence: 99%

Using Nickel as a Catalyst in Ammonium Thiosulfate Leaching for Gold Extraction

2004

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The use of copper as a catalyst for gold leaching in ammonium thiosulfate solution might cause the high consumption of thiosulfate. Also, the high copper consumption is resulted in the zinc precipitation process for recovering the gold from the pregnant solution. In this investigation, nickel was used as a catalyst to minimize the reagent consumption. On a 100 mass%-75 mm of silicate type gold ore containing 16 g/t Au and 0.2 mass% of Fe and C, the nickel catalyzed ammonium thiosulfate solution could extract 95% of gold with the 1.2 kg/t-ore of ammonium thiosulfate consumption in 24 hours at the most favorable reagent combination of 0.0001 mol/dm 3 NiSO 4 , 0.05 mol/dm 3 (NH 4 ) 2 S 2 O 3 and 0.5 mol/dm 3 NH 4 OH at pH9.5, while the standard cyanidation at 0.02 mol/dm 3 (1.0 g/dm 3 ) NaCN consumed around 1.5 kg/t-ore NaCN. In the concentration range of 0:0001$0:005 mol/dm 3 Ni 2þ , the ammonium thiosulfate consumption was 1$5 kg/t-ore, while the ammonium thiosulfate consumption of copper catalyzed lixiviant was greatly increased from 3 kg/t-ore to 21 kg/t-ore as the increase of Cu 2þ concentration from 0.0001 mol/dm 3 to 0.001 mol/dm 3 . The feasibility of recycling barren solution was confirmed with zinc precipitation at nearly 100% of gold recovery. Nickel consumption on the cementation process was less than 50%. For extracting gold from the copper bearing sulfide ore, a higher ammonia and thiosulfate concentrations were required with 0.0001 mol/dm 3 of Ni 2þ . The ammonium thiuosulfate consumption with nickel as catalyst on the copper bearing sulfide ore was about 1$5 kg/t-ore less than that using copper as catalyst.

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Thiocyanate solutions in gold technology

Cited by 58 publications

References 2 publications

Sorption and Separation of Thiocyanate Gold and Silver Complexes and Determination of Gold by Diffuse Reflectance Spectroscopy

Sorption and Separation of Thiocyanate Gold and Silver Complexes and Determination of Gold by Diffuse Reflectance Spectroscopy

Enhancement of Au·Ag Leaching by Mechanochemical Activation and Thiourea-Thiocyanate Mixing Solution

Using Nickel as a Catalyst in Ammonium Thiosulfate Leaching for Gold Extraction

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