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The Deposition of Elemental Gold from Gold(I)Thiosulfate

The Deposition of Elemental Gold from Gold(I)Thiosulfate Complexes Mediated by Sulfate-Reducing Bacterial Conditions Article in Economic Geology 102(1):109-126 · January 2007 with 70 Reads

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The Deposition of Elemental Gold from Gold(I)-Thiosulfate

The Deposition of Elemental Gold from Gold(I)-Thiosulfate Complexes Mediated by Sulfate-Reducing Bacterial Conditions Maggy F. Lengke. Maggy F. Lengke Department of Earth Sciences, University of Western Ontario, London, Ontario, Canada N6A 5B7 † Corresponding author: e-mail, [email protected] Search for other works by this author on: GSW. Google Scholar; Gordon

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Gold recovery from ammonia-thiosulfate leaching solution

During this time, gold was dissolved according to reaction (1), and the formation of the gold-thiosulfate complex Au(S 2 O 3) 2 3− occurred. At the end of the leaching process two gold-thiosulfate complex solutions were obtained, with gold concentrations of 336.8 mg Au L −1 and 170.2 mg Au L −1. 2.4. Adsorption of gold on the PEI-MNPs

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The effect of thiosulfate-oxidizing bacteria on the

In the type 1 experiments, the bacterial populations increased slightly from 1.0 × 10 7 to 2.0 × 10 7 bacteria/mL or generally remained constant at 1.0 × 10 8 bacteria/mL (see Table 1 and Fig. 2).Whether or not bacterial growth occurred, the total gold concentrations decreased in all systems ().The amount of gold precipitated in the experiments conducted in the dark was less than that

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Preg-robbing of gold from cyanide and non-cyanide

Gold thiosulfate solution was prepared by dissolving 130 μg of gold (I) sodium thiosulfate in 500 mL of 0.1 M thiosulfate solution at pH of 10–11 to obtain 50 mg/L Au. To obtain 50 mg/L Au in thiourea solution, 50 μg of gold flakes was dissolved in 500 mL of 0.001 M thiourea solution at pH of 1–2 at 40 °C. Both thiosulfate and thiourea gold stock solutions were diluted appropriately to

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Bioaccumulation of gold by sulfate-reducing

Bioaccumulation of gold by sulfate-reducing bacteria cultured in the presence of gold(I)-thiosulfate complex Article in Geochimica et Cosmochimica Acta 70(14):3646-3661 · July 2006 with 414 Reads

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Ammonium thiosulfate extraction of gold from printed

2.2. Gold leaching experiments. Batch leaching experiments were conducted to investigate the effects of leaching time (12–72 h), the presence/absence of oxygen, solid-to-liquid ratio (0.1–1 g/10 ml), CuSO 4 concentration (0.1–10 mM), Na 2 S 2 O 3 concentration (0.001–3 M) and total ammonia/ammonium concentration (0.01–1 M) on the extractions of Au and other coexisting metals from

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Thiosulfate leaching of gold—A review ScienceDirect

It is suggested that ammonia prevents gold passivation by being preferentially adsorbed on gold surfaces over thiosulfate thus bringing gold into solution as an ammine complex (Jiang et al., 1993; Chen et al., 1996). 138 M. G. Alymore and D. M. Muir TABLE 1 Stability constants for gold complexes Gold species Au(CN)2- Au(SCN)2- Au(SCN)4- AuC14- Au(NH3)2+ Stability Log K* 38.3 16.98 10

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A fundamental study of the alkaline sulfide leaching of gold

A fundamental study of the alkaline sulfide leaching of gold (Anderson, 2001). This approach has been used dissolve gold which is associated with elemental sulfur following the partial oxidation of sulfide minerals. Both sulfide and thiosulfate form strong complexes with gold, as shown in Eqs. (6) and (7). The stability constant of the sulfide and thiosulfate complexes of gold are 2 x 1036

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Thiosulfate leaching of gold A review Request PDF

Thiosulfate leaching of gold A review Article in Minerals Engineering 14(2):135-174 · February 2001 with 6,140 Reads How we measure 'reads'

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Morphology of Gold Nanoparticles ResearchGate

Morphology of Gold Nanoparticles Synthesized by Filamentous Cyanobacteria from Gold(I)−Thiosulfate and Gold(III)−Chloride Complexes Article in Langmuir 22(6):2780-7 ·

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Gold Wikipedia

Gold is the most malleable of all metals. It can be drawn into a monoatomic wire, and then stretched about twice before it breaks. [citation needed] Such nanowires distort via formation, reorientation and migration of dislocations and crystal twins without noticeable hardening.A single gram of gold can be beaten into a sheet of 1 square meter, and an avoirdupois ounce into 300 square feet.

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(PDF) The adsorption of gold on activated carbon from

However, the large amount of copper will be co-precipitated along with gold because the stability of zinc ammine and thiosulfate complexes are higher than that of copper's. Aluminum may reduce

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GOLD LECHING FROM A SAUDI ORE BY THE NONPOLLUTING

Gold dissolution in ammoniacal thiosulfate can be described as shown in Fig. 1. Leaching of gold in thiosulfate solutions is a metal oxidation process as described in Eq. 1 (Chen, 2008) 4Au + 8S 2 O 3 2 -+ O 2 + 2H 2 O = 4[Au(S 2 O 3) 2] 3 + 4OH-. (1)

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Organogold chemistry Wikipedia

Organogold chemistry is the study of compounds containing gold–carbon bonds. They are studied in academic research, but have not received widespread use otherwise. The dominant oxidation states for organogold compounds are I with coordination number 2 and a linear molecular geometry and III with CN = 4 and a square planar molecular geometry. The first organogold compound discovered was gold

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Analysis of gold(I/III)-complexes by HPLC-ICP-MS

20/05/2014· We present a reversed phase ion-pairing HPLC-ICP-MS method for the separation and determination of aqueous gold(III)-chloro-hydroxyl, gold(III)-bromo-hydroxyl, gold(I)-thiosulfate, and gold(I)-cyanide complexes. Detection limits for the gold species range from 0.05 to 0.30 μg L(-1). The [Au(CN)2](-) gold cyanide complex was detected in five of six waters from tailings and adjacent

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Elements: Gold YouTube

21/06/2012· He is curating an Elements event with Hugh Aldersey-Williams on Friday 22 June 2012 that will look at gold, silver and bronze (tin and copper). This special late night event will have activities

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Associated Sulfide Minerals in Thiosulfate Leaching of

The effects of some associated minerals on thiosulfate gold leaching were studied through thermodynamic analysis and leaching experiments on composite ore samples containing various minerals and a reference silicate gold ore.

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Gold Complexes Gold Catalysts Sigma-Aldrich

Sigma-Aldrich Online Catalog Product List: Gold Complexes

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PRETREATMENT PROCESSES IN GOLD RECOVERY BY

elemental carbon. (Nanthakumar et al., 2007) Active carbon components possess the ability to adsorb gold chloride or its complexes from solutions, usually the active carbon components associates with a mixture of high molecular weight hydrocarbons. Carbonaceous matter can also include organic acid which is either humic acid or similar to it. The acid component has the ability to interact with

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