elution of gold from activated carbon

Fundamentals of the elution of gold cyanide from activated ...

Although the loaded carbon contained only Au(CN)2, the presence of cyanide was found to drastically enhance the elution of the gold. It was shown that the cyanide present in the elution step of an AARL elution was less important than the cyanide in the pretreatment solution.

US3935006A - Process for eluting adsorbed gold and/or ...

A process is disclosed which is directed to recovering gold and/or silver values from activated carbon, wherein gold and/or silver has been adsorbed thereon. The process comprises eluting the activated carbon with water soluble alcohols or ketones either alone or with aqueous solutions thereof and a strong base may be added to further facilitate elution.

Further studies on the elution of gold from activated ...

Some of the parameters affecting the elution of gold from freshly loaded activated carbon using pure water as an eluant were studied. The procedure involved pretreatment of the gold-loaded activated carbon with a strong reagent of sodium cyanide and sodium hydroxide, followed by elution of the gold with water. Gold-loaded carbon

Gold complexes and activated carbon | SpringerLink

Exciting new developments are taking place in the extractive metallurgy of gold, which are based upon the adsorption of the metal or its complexes on carbon and subsequent elution. Despite the efforts of investigators over a period of almost 70 years, however, the mechanisms of the adsorption and elution processes have not yet been established unequivocally. The literature relating to them is ...

Elution behaviour of metals from carbon

activated carbon. Gold and mercury are of primary interest, due to their value and environmental impact respectively. A laboratory elution rig was commissioned to simulate industrial Zadra and AARL carbon elution conditions. Mercury was found to elute most effectively in strong caustic cyanide solutions; gold …

Elution and Carbon Reactivation - Resource book

adsorbing onto activated carbon. Elution is the next step in the process, whereby the adsorption of the gold cyanide complex onto carbon is reversed. Loaded carbon is removed from the CIL circuit and the gold stripped from the carbon using a number of treatment steps. The result is a solution of high gold concentration (pregnant eluate).

Activated Carbon in Gold Cyanidation

Activated Charcoal

ACTIVATED CARBON IN GOLD RECOVERY - Kemix

surface of the activated carbon into the interior. The macropores allow for the rapid movement of adsorbates (species that will be adsorbed by the carbon, e.g. gold) into the activated carbon granules. Mesopores (100 Å to 500 Å) these are the pores that branch off the macropores that serve to allow the adsorbates to leave the macropores

Adsorption Capacity of Gold on Activated Carbon

Activated carbon hasalready been used successfully in commercial processes1that require the removal of smallamounts ofgold(2mg.I-I) andsilverfromcyanide pulps. Anumber ofpilot-plant investigations on the ... complete elution ofthe gold canbeachieved only ifa gold-complexing agent suchasCN-orCNS-ispresent intheeluant. Thisgivescredence ...

The Role of Cyanide in the Elution of Gold from Activated ...

The Role of Cyanide in the Elution of Gold from Activated Carbon It is the aim of this paper to review recent research in understanding the role of cyanide in the elution of gold. Under conditions of severe pre-treatment (high temperatures and levels of cyanide), the dynamics of elution are determined mainly by the adsorption equilibrium and ...

Gold recovery from loaded activated carbon using different ...

Jan 01, 2008· The processing of gold solution depends on the adsorption of Au(CN) 2 − onto activated carbon, and its subsequent stripping (or elution) from the activated carbon (Arriagad and Garcia, 1997, Bryson, 1995, Petersen and Van Deventer, 1997, Streat and Naden, 1987, Yalcin and Arol, 2002).

Elution of Gold from Activated Carbon Using Supercritical ...

Aug 20, 2006· Abstract. A novel method for the desorption of gold from activated charcoal is reported. Ion pair solvation of sodium dicyanoaurate (I) (Na + … Au(CN) 2 − by tributyl-phosphate facilitates the charge neutralization necessary for the elution of the ionic Au(CN) 2 − by the non-polar supercritical carbon dioxide. The method is sensitive to pressure and temperature, and the static (no CO 2 ...

Washing Activated Carbon - Mineral Processing & Metallurgy

Jun 07, 2016· In the process of washing activated carbon, a dilute hydrochloric acid solution (3%) is circulated/pumped into the elution column. The acid dissolves inorganic foulants such as calcium carbonate, magnesium and sodium salts, fine ore Minerals such as silica, and fine iron particles. The carbon acid wash cycle takes about 4.30 hours.

Carbon Stripping – Denver Mineral Engineers

Activated carbon has long been known to exhibit a strong affinity for the extraction of gold from cyanide solutions. It was not, however, until methods for chemically desorbing gold from loaded carbon were developed, that the process came into widespread use for gold recovery from ore. These procedures allowed the carbon to be recycled for ...

Ultrasonic elution of gold from activated carbon ...

The feasibility of using ultrasound to enhance the elution of gold from activated carbon was investigated. A laboratory-scale elution column immersed in an ultrasonic bath was used to investigate three eluant systems. The kinetic activity of the activated carbon …

mining gold elution process

the elution of gold from activated carbon at room saimm. the elution of gold cyanide from loaded carbon. in the zadra process!, a hot solution of caustic cyanide (typically comprising about 0,5 the joumal of the south african institute of mining and metallurgy. early work by feldtman7 and gross .

WO2016104113A1 - Method for recovering gold from activated ...

The purpose of the present invention is to make it possible: to, before gold is eluted, effectively remove copper, iron, and sulfur, which are impurities from the standpoint of gold recovery, from activated carbon on which gold has been adsorbed; and to efficiently elute the gold. Provided is a method for eluting gold (Au) from activated carbon on which at least sulfur (S) and Au have been ...

ACTIVATED CARBON IN GOLD RECOVERY-22June'12

During elution, in which the gold is removed from the carbon. This is diluted to 300 g/t ... The recovery of gold is not as simple as adsorbing the gold onto activated carbon then

Modeling of gold elution from activated carbon using a ...

Nov 01, 1997· A plug-flow model is described for the reactor mass balance of a typical AARL gold elution process. The model is in the form of a hyperbolic differential equation and was transformed using the method of characteristics. The transformed model was then solved simultaneously with models dependent on intraparticle surface diffusion and film transfer parameters. The solution was found to …

The mechanism of elution of gold cyanide from activated ...

Numerous articles have appeared on the mechanism of the adsorption of gold cyanide onto activated carbon. In contrast, little information is available on the mechanism of elution of the adsorbed gold. It is the objective of this article to formulate such a mechanism on the basis of batch and column elution tests without analyzing adsorbed species on the carbon directly.

Discussion on the kinetics of the elution of gold from ...

Discussion on the kinetics of the elution of gold from activated carbon where A is the superficial area of the carbon per unit mass of carbon. A mass balance of the gold on the activated carbon inside the reactor yields: [7] The initial conditions are given by: [8] [9] Equations [5] and [7] were solved, subject to …

(PDF) Gold complexes and activated carbon - A literature ...

The pretreatmenty of gold-loaded activated carbon with a relatively strong sodium cyanide solution prior to elution with deionized water at 90 to 125 degree C has been shown to have a most ...

Elution of gold from carbon by the micron solvent ...

The desorption of gold from activated carbon is promoted by adding organic solvents to aqueous cyanide solutions. At 65–80°C the elution of gold is fast and is not affected by water quality. The Micron procedure involves pretreatment of the loaded carbon with NaCN/NaOH followed by elution with methanol vapour and condensate. Carbon is packed into a column above the distillation pot and acts ...

elution and electrowinning for gold processing plant

Nov 18, 2012 elution and electrowinning plant manufacturers south africa Optimizing manganese ore sinter plants elution, electrowinning and smelting gold operating the 6-tonne AARL elution circuit, More detailed 2 days ago The Elution and Goldroom plant is the final step in the gold process flowsheet, where the gold cyanide complex is desorbed from the activated carbon, recovered as a metal in ...

THE EFFECT OF ACTIVATED CARBON PARTICLE SIZE ON GOLD ...

The effect of particle size on gold adsorption and elution from activated carbon has been studied in alkaline solution, in order to understand the nature of gold losses on fine activated carbons, to improve the rate of gold recovery, and to develop an innovative way of treating preg-robbing gold ores. Four stripping techniques (atmospheric Zadra,

(PDF) Kinetics of elution of gold from activated carbon by ...

Recently, the adsorption and elution of PGM cyanide complexes onto activated carbon has also been demonstrated and is similar to the activated carbon process for gold. The stripping of adsorbed ...

The mechanism of elution of gold cyanide from activated ...

The application of activated carbon for the adsorption and ...

complexes from activated carbon using an analogue of the AARL process was investigated. Platinum and palladium elute from activated carbon almost to completion in 4 to 5 bed volumes at 80°C, while the elution of gold at this temperature is slow, with a significant amount of …

Ultrasonic elution of gold from activated carbon | Request PDF

The elution of gold and silver from activated carbon using organic solvents and the reactivation of the eluted carbon. Report No. 6, Anglo-American Research Laboratories, Johannesburg, South Africa.

Fundamentals of the elution of gold cyanide from activated ...

Although the loaded carbon contained only Au (CN)2, the presence of cyanide was found to drastically enhance the elution of the gold. It was shown that the cyanide present in the elution step of an AARL elution was less important than the cyanide in the pretreatment solution. It was concluded that the cyanide passivates the carbon for the ...

The elution of gold from activated carbon using deionized ...

Fig. I-The elution of gold, silver and nickel from activated carbon after pretreatment with 10 per cent potassium carbonate-5 per cent potassium hydroxide carbonate or the higher pH (hydroxide) was individually responsible for the efficient elution, or whether a strong hydroxide pretreatment in the absence of added carbon-ate would suffice. Fig ...

The role of cyanide in the multi-component elution of ...

Internationally the most common technology for the elution of gold from activated carbon is the Anglo American Research Laboratories (AARL) method or modifications thereof. This process consists of a pre-treatment step in which the loaded carbon is soaked with cyanide at a high temperature, followed by a rinsing step using high quality water.

Ultrasonic elution of gold from activated carbon ...

Mar 01, 2003· The Anglo elution procedure ( Davidson and Duncanson, 1977; Davidson and Veronese, 1979) is an alternative approach, which elutes gold in 8–12 h using deionised water at 100–120 °C. In this procedure, the carbon is pre-soaked with 5% w/v NaCN/1% w/v NaOH solution. This process is sensitive to the quality of water used.

Factors affecting the elution of gold cyanide from ...

Jan 01, 1994· The cyanide-age of the carbon, QN, is defined as the amount of cyanide, in g CN-/kg carbon, that has been Elution of gold cyanide from activated carbon 79 adsorbed or oxidised on the carbon. In an experiment to quantify the effect of cyanide-age on the desorption of gold cyanide, five samples of carbon were loaded with gold to the same level.

[PDF] The elution of gold from activated carbon at room ...

Corpus ID: 120099119. The elution of gold from activated carbon at room temperatures using sulphide solutions @article{Adams1994TheEO, title={The elution of gold from activated carbon at room temperatures using sulphide solutions}, author={M. Adams}, journal={Journal of The South African Institute of Mining and Metallurgy}, year={1994}, volume={94}, pages={187-198} }

elution of gold from activated carbon

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