adsorption of gold on cyanide
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adsorption of gold on cyanide

Adsorption of gold from cyanide leaching solution onto ...

2017-10-25  In the gold hydrometallurgy industry, gold is extracted from cyanide leaching solution by adsorption onto activated carbon. The main advantages of activated carbon are its high selectivity towards gold relative to base metals, its ease of elution and its large particle size,,. In addition, activated carbon has some other significant advantages such as high adsorption capacity, porous structure,

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Adsorption of gold cyanide on quartz - ScienceDirect

2020-4-5  The adsorption of gold cyanide onto the surface of quartz (101) is discussed based on experimentation combined with quantum chemistry calculations. Adsorption tests were conducted by using gold cyanide and quartz power. Atomic absorption, infrared spectroscopy, energy-dispersive x-ray spectroscopy, and x-ray photoelectron spectroscopy were used to characterize the elemental content in solution and species adsorbed onto the quartz

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Adsorption of gold from cyanide leaching solution onto ...

The maximum adsorption rate of gold obtained about 87.11% under optimal condition. • The optimized values of the factors were verified and compared with real system. Abstract. This study investigates the behavior of gold adsorption from cyanide leaching solution onto activated coconut shell carbon. The experimental was designed according to ...

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Adsorption of Gold Cyanide on Activated Carbon

2016-8-10  They found the adsorption rates for both gold and silver cyanide tobecontrolled bytherate ofporediffusion in the temperature range 25to55°C,and the activation energies tobesmall-8 to13kJ.mol-l. Theyfound that, although the size ofthe carbon granules affects the initial rate ofadsorption, observing faster rates forthe smaller sizefractions, ithasnoeffectontheequilibrium amount of gold adsorbed. They

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(PDF) An XPS study of the adsorption of gold (I) cyanide ...

Activated carbons are used extensively by the gold-mining industry for the recovery of gold from cyanide leach liquors. The most widely used material is activated coconut shell carbon which,...

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Gold Cyanide Adsorption on Activated Carbon

2016-12-19  The Carbon-in-Pulp (CIP) gold processing technology has enabled a rapid, world-wide growth in gold production. As a result, gold is one of the few winners for the mining industry in the 1980's. The key step in the CIP technology is the adsorption of the gold(1) dicyanide ion, Au(CN)2-, onto coarse carbon granules. This adsorption mechanism has been studied since at least 1909 and a number of

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Gold cyanide adsorption characteristics of activated ...

2002-2-1  Adsorption of gold by the activated carbons with respect to time is determined by equilibrating 1 g of −7+14 mesh size activated carbon samples with 1.7 L of a 5-mg/L Au borate buffered K[Au(CN) 2] solution in a baffled glass cylinder that is stirred at 400 min −1.The gold concentration of the solution is determined periodically over an 8-h exposure and results are plotted in Fig. 2.

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Rate of adsorption of gold cyanide on activated charcoal ...

The rate of adsorption of gold cyanide on activated charcoal was examined as a function of charcoal concentration and size, temperature, initial gold concentration, pH, and initial concentration of gold on the charcoal. Rate was found to be proportional to temperature, concentration of charcoal and initial gold concentration on charcoal, and to the inverse of charcoal particle size squared. An ...

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Efficient adsorption of Au(CN)2− from gold cyanidation ...

2017-1-1  The adsorption of gold cyanide complex ion (Au(CN) 2 −) on graphene oxide-polyethylenimine hydrogel (GO/PEI hydrogel) from gold cyanidation has been studied to explore the possibility of the application of GO/PEI hydrogel in gold cyanidation process for extracting gold from ores.The adsorption was carried out in artificial Au(CN) 2 − aqueous solution with GO/PEI hydrogel as adsorbent.

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(PDF) ABSORPTION OF GOLD CYANIDE ONTO ACTIVATED

Gold adsorption test using a waste solution (21 ppm of gold) showed that the activated carbon C-850-1.5 had the highest value of adsorption capacity (4.58 mg Au/g) compared to C-850-2.5 (2.95 mgAu ...

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adsorption of gold on cyanide - illowafca.org

The Kinetics of Gold Cyanide Adsorption on Activated . On Jan 6, 1979 Eung Ha Cho (and others) published: The Kinetics of Gold Cyanide Adsorption on Activated Charcoal. Inquire Now; Activated carbon Wikipedia. Uses. Activated carbon is used in air purification, decaffeination, gold purification, metal extraction, water purification, medicine ...

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(PDF) An XPS study of the adsorption of gold (I) cyanide ...

A mechanism for gold cyanide adsorption is required which explains the dependence of the reaction on a number of parameters including pH, the pres- ence of 'spectator', ions and the effect of ...

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Gold Cyanide Adsorption on Activated Carbon

2016-12-19  content 40 wt%) and Norit R2520 (gold content 20 wt%) for gold adsorption from cyanide-free pH10 boCI buffer at 30'C. The N Is state is sensitive to the local site environment on the carbon as previously demonstrated when the effect of H+ on the structure of the adsorbed gold species on carbon was explored (Klauber, 1988).

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Effect of Metal Impurities on Adsorption of Gold by ...

adsorption of gold was determined by adding sodium gold cyanide to the synthetic feed solution, producing a gold concentration of 150 ppm. This concentration is signif. icantly higher than metal concentrations normally encoun­ tered in most gold plant solutions; however, the results are indicative of the loading phenomena.

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(PDF) An XPS study of the adsorption of gold (I) cyanide ...

The reversibility of the adsorption of gold onto carbon is a function of the nature of the adsorbed gold and determines the need for cyanide in the elution process, which affects the operating ...

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The kinetics of gold cyanide adsorption on activated ...

Adsorption rates of gold cyanide on activated carbon were determined as a function of temperature, free cyanide concentration and charcoal concentration. The experimental rate data is explained by use of a diffusion controlled model developed by Crank. The adsorption rates were determined to be controlled by pore diffusion with the effective diffusion coefficient having an activation energy of ...

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Adsorption of gold cyanide on quartz,Colloids and

2020-1-31  The adsorption of gold cyanide onto the surface of quartz (101) is discussed based on experimentation combined with quantum chemistry calculations. Adsorption tests were conducted by using gold cyanide and quartz power. Atomic absorption ...

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Quantifying the Effect of Competitive Adsorption of Gold ...

2016-1-7  Fig 3: Effect of copper cyanide on gold adsorption . Effect of Iron Cyanide on Gold Adsorption . Iron dissolves from the ore as a Fe(CN) 6 4-strong complex. However this complex does not either adsorb on the activated carbon or prevent the adsorption of gold cyanide even at as high concentrations as 1000 ppm [5]. 0 20 40 60 80 100 120 0 50 100 ...

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(PDF) ABSORPTION OF GOLD CYANIDE ONTO ACTIVATED

Gold adsorption test using a waste solution (21 ppm of gold) showed that the activated carbon C-850-1.5 had the highest value of adsorption capacity (4.58 mg Au/g) compared to C-850-2.5 (2.95 mgAu ...

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Rate-determining mechanisms for the adsorption of gold

The adsorption of gold cyanide complex onto GAC is a multistage process, which consists of the mass transport of gold cyanide complex across the solution film surrounding the carbon particle to ...

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The mechanism of the adsorption of gold cyanide on ...

and thermodynamics of the adsorption of gold and Rilver cyanide on activated coconut-shell carbon. They found the adsorption rates for both gold and silver cyanide to be controlled by the rate of pore diffusion in the temperature range 25 to 55°C, and the activation energies to

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Adsorption of gold cyanide complexes by activated carbon ...

1995-12-31  OSTI.GOV Book: Adsorption of gold cyanide complexes by activated carbon on non-coconut shell origin

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Effect of Metal Impurities on Adsorption of Gold by ...

adsorption of gold was determined by adding sodium gold cyanide to the synthetic feed solution, producing a gold concentration of 150 ppm. This concentration is signif. icantly higher than metal concentrations normally encoun­ tered in most gold plant solutions; however, the results are indicative of the loading phenomena.

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(PDF) An XPS study of the adsorption of gold (I) cyanide ...

The reversibility of the adsorption of gold onto carbon is a function of the nature of the adsorbed gold and determines the need for cyanide in the elution process, which affects the operating ...

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Competitive Adsorption of Gold Cyanide and Organic ...

2018-8-21  Competitive Adsorption of Gold Cyanide and Organic Compounds onto Porous Adsorbents F. W. Petersen DEPARTMENT OF CHEMICAL ENGINEERING CHEMICAL ENGINEERING , CAPE TECHNIKON PO BOX 652, CAPE TECHNIKON,

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Rate of adsorption of gold cyanide on activated charcoal ...

The rate of adsorption of gold cyanide on activated charcoal was examined as a function of charcoal concentration and size, temperature, initial gold concentration, pH, and initial concentration of gold on the charcoal. Rate was found to be proportional to temperature, concentration of charcoal and initial gold concentration on charcoal, and to the inverse of charcoal particle size squared.

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How Metal Impurities Affect Gold Adsorption on Activated ...

2017-11-18  In this case, gold adsorption increased with increasing pH, from 64 pct at pH 6.8 to a maximum of 78 pct at pH 12.3. From pH 6.8 to 11.3, gold adsorption was lower in the presence of thallium than in its absence. Effect of Gold on Metal Cyanide Complex

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Removal of cyanide from the gold cyanidation plant ...

2021-6-19  The adsorption experiments on the tailings of a gold cyanidation plant showed that the developed adsorbents were capable of removing more than 90% of cyanide from the real sample. Introduction Cyanide compounds are extensively used

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GOLD ADSORPTION ON ACTIVATED CARBON AND THE

2010-11-5  The adsorption of gold cyanide from clear solutions was found to be characterized by intra-particle diffusion rate control, limited by a finite film mass transfer rate at low gold loadings. When fine suspended solids are present it is shown that blinding of the carbon macropores is the likely cause of the reduced adsorption

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Kinetic and Adsorption Isotherms Study of Cyanide

2021-8-21  the gold processing plant waste waters based on isotherms and kinetic model investigation. Thus, in this research we investigated the effective parameters on cyanide adsorption and models were used to determine the best fit of equilibrium isotherm for cyanide adsorption on natural and impregnated zeolites. EXPERIMENTAL SECTION

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