"elution of gold from activated carbon"

Gold recovery from loaded activated carbon using different ...

2003-3-1 · 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.

The elution of gold from activated carbon using …

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 ...

Ultrasonic elution of gold from activated carbon ...

2021-8-3 · 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 was improved in …

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 ...

The elution of gold from activated carbon at room ...

1994-8-1 · Elution efficiencies of around 100 per cent were obtained in 4 hours with a single pass of eluant containing 0,2 M Na2S and 0,4 NaOH - about 10 bed-volumes of eluant The initial rate was slow over the first hour of elution, probably because the activated carbon catalysed the oxidation of …

Evaluating a Dynamic Model for the Competitive Elution of ...

2006-8-16 · The adverse effect of high loadings of a base metal such as copper on carbon during the desorption of gold is known, but not yet fully understood. A multicomponent Freundlich equilibrium model was used for the simulation and evaluation of the elution of gold and base metals from activated carbon.

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

1997-11-1 · 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 …

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

Further studies on the elution of gold from activated carbon using water as the eluant by R. J. DAVIDSON*, Ph.D. (Rhodes) and V. VERONESEt, Dip. Chem. Analyst SYNOPSIS Some of the parameters affecting the elution of gold from freshly loaded activated carbon using pure water as an

ACTIVATED CARBON IN GOLD RECOVERY

2018-1-15 · 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

Gold Adsorption by Activated Carbon and Resin: Mineral ...

2018-6-9 · Activated carbon and resins readily adsorb gold from cyanide leach solutions. The main advantages of carbon are its high selectivity towards gold, its ease of elution and its large particle size. On the other hand, resins do not suffer from the problems of …

Solvent elution of gold from C.I.P. carbon

The effectiveness of the solvents in promoting gold desorption from activated carbon is in the order acetonitrile > methyl ethyl ketone ⩾ acetone ⪢ dimethylformamide > ethanol. Aqueous acetonitrile and aqueous acetone strip gold in < 8 h using 2–3 bed volumes at temperatures between 25 and 70°C. These organic solvents in particular are strongly adsorbed onto carbon and significantly ...

THE EFFECT OF ACTIVATED CARBON PARTICLE SIZE ON …

2015-7-7 · 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,

Elution of Gold from Activated Carbon Using Supercritical ...

2006-8-20 · 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 ...

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

The pretreatment of gold-loaded activated carbon with a relatively strong sodium cyanide solution prior to. elution with deionized water at 90 to 125°C has been shown to have a most beneficial effect on the elution of gold. The findings emphasize the important role played by the calcium cation and the hydroxyl anion in effecting efficient.

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 ...

(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 ...

DESORPTION OF GOLD AND SILVER FROM ACTIVATED …

Lunga, A. L. (2006) Optimizing the operating conditions of gold elution and electrowinning for Tau Lekoa stream at Kopanang gold plant. University of the Witwatersrand. Nakahiro, Y., Kawaguchi, T., Kusaka, E., Niinae, M. and Wakamatsu, T. (1992) "A Study on Recovery of Gold with Activated Carbon from Leaching Solution by Acidothioureation.,"

The elution of gold from activated carbon at room ...

The elution of gold from activated carbon at room temperature using. sulphide solutions by M.D. Adams* Introduction The carbon-in-pulp (CIP) process is the most widely used method for the recovery of gold in new plants. However, despite the commercial success of the process as a whole, there remains much scope for improvement. One such area is

(PDF) Gold desorption from activated carbon with dilute ...

The elution of gold and silver from activatedcarbon using organic solventsand the reactivationof the eluted carbon, Anglo American Research Laboratories, Report 6, Johannesburg, 1976. 9 Jankowska, H., Neffe, S. and Swiatkowski, A., Investigations of the electrochemical prop- ertiesof activated carbon and carbon black, Electrochim.

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.

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. The presence of ...

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

2015-12-27 · 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.

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

One of the main bottlenecks in the carbon-in-pulp process for the recovery of gold is the elution procedure, which typically requires the heating of caustic cyanide eluants to high temperatures for 16 to 24 hours. The present work demonstrates that sodium sulphide solution as an alternative eluant can effect complete elution in about 4 hours at ambient temperatures.

(PDF) Gold complexes and activated carbon

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 ...

Ultrasonic elution of gold from activated carbon | Request …

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.

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

2009-8-26 · 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 the conditions