The mechanism of elution of gold cyanide from activated carbon
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 …
The kinetics of the organic elution of gold cyanide from activated
Elution of Gold from Activated Carbon Using Supercritical Carbon Dioxide. E. O. Otu. Chemistry. 1997; 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 …
The Effect of Ionic Strength on the Elution of Gold …
Industrial grade liquid CO2 (99.8 per cent) was purchased from BOC Gases. Sigma-Aldrich provided TBP of 99 per cent purity. Activated carbon (PH5 ASTM 6/12A), supplied by Haycarb Tech, was washed with water to remove any fines and dried overnight. Fisher Chemical provided Sodium Chloride (NaCl) of 99.2 per cent purity.
Washing Activated Carbon
Next. 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.
Fundamentals of the elution of gold cyanide from activated carbon
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 ...
Further studies on the elution of gold from …
SYNOPSIS. and Analyst. Some of the parameters affecting the elution of gold from freshly loaded activated carbon using pure water as an eluant were studied. The procedure …
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The Kinetics of the Elution of Gold from Activated Carbon M.D. ADAMS and M.J. NICOL Council for Mineral Technology (Mintek), Randburg A study of the rate of elution of aurocyanide from activated ...
Desorption of gold and silver from activated carbon
Referring bigger the solid fraction, the lesser the to such a case, a granular activated carbon desorbed gold and silver. In this case, it (GAC) is favorable for gold elution. The use seemed that solid fraction of 25% was the of GAC size for gold elution ranges from 850 best condition for gold and silver desorption.
Continuous Elution for Extraction of Gold from Carbon
The continuous elution process is a continuous counter-current system operating in a pressure vessel at elevated pressure and temperature in which both carbon and the eluate are simultaneously moving through each other in opposite directions. During this process the carbon particles enter the top of the vessel loaded with gold and exit …
ACTIVATED CARBON IN GOLD RECOVERY
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 …
A review of the AARL process for the elution of gold from activated carbon
Parameters affecting gold elution using the AARL process are reviewed and critically analyzed in an attempt to optimise metallurgical efficiency and minimise costs in both current and future carbon adsorption operations. Such factors as acid washing, column geometry, elution temperatures and pretreatment reagents are discussed together with …
A review of the AARL process for the elution of gold from activated carbon
Purchase this Article for $25.00. Parameters affecting gold elution using the AARL process are reviewed and critically analyzed in an attempt to optimise metallurgical efficiency and minimise costs in both current and future carbon adsorption operations. Such factors as acid washing, column geometry, elution temperatures and pretreatment ...
Carbon Extraction | Gold & Precious Metal Recovery | CPL Activated Carbons
CPL Activated Carbons supplies a range of carbons for the gold mining industry, which independent testing, by leading academic institutions, has shown to offer exceptional performance. Our products are characterised by the following properties: – High rates of gold loading and elution – Good resistance to mechanical attrition
Gold desorption from activated carbon with dilute …
The process involves contact of gold laden activated carbon with a strong base at ambient temperatures followed by elution with an aqueous solution containing an organic solvent. Results showed that aqueous solutions of organic solvents, preferably aqueous solution of acetone or acetonitrile could be effectively used in the recovery of …
Ultrasonic elution of gold from activated carbon
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 …
A systematic review of sustainable gold extraction from …
The most common reagent used in gold elution from loaded activated carbon is NaOH/NaCN (Phiri, 2019; Snyders et al., 2015). This process is widely applied at the industrial level. The company Jacobi Group offers a full range of carbon products to serve the gold recovery industry.
The mechanism of elution of gold cyanide from activated carbon …
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 …
Kinetic modelling of gold cyanide multi‐cycle adsorption and elution …
Kinetic modelling of gold cyanide multi‐cycle adsorption and elution using activated carbon in the presence of foulants. Emmanuel O. Otu. Department of Chemical Engineering, University of Waterloo, Waterloo, Ontario N2L 3G1 ... kinetics of multiple exposure of a granular activated carbon in a laboratory‐scale packed bed to solutions ...
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, …
The kinetics of the elution of gold from activated …
Evaluating a Dynamic Model for the Competitive Elution of Gold and Base Metals from Activated Carbon. S. P. Liebenberg J. Deventer. Chemistry, Engineering. 1997. …
THE EFFECT OF ACTIVATED CARBON PARTICLE SIZE ON …
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,
An investigation into alternative eluants from activated carbon …
Figure 5 depicts gold transport in this thiourea eluant, activated carbon, and residue as a function of time, and also provides comparison to conventional Zadra elution. From this Figure, it is seen that total gold in the thiourea eluant falls away rapidly as a function of time, after plateauing at around 45 minutes.
Gold recovery from loaded activated carbon using …
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 …
Gold complexes and activated carbon | Gold Bulletin
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 …
Ultrasonic elution of gold from activated carbon
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 activated carbon
Evaluating a Dynamic Model for the Competitive Elution of Gold and Base Metals from Activated Carbon. S. P. Liebenberg J. Deventer. Chemistry, Engineering. 1997. Abstract During the past fifteen years significant progress has been made on carbon-in-pulp (CIP) technology for the extraction of gold.
Further studies on the elution of gold from activated …
SYNOPSIS. and Analyst. 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.
(PDF) ZADRA Elution Circuit Optimisation and Operational …
The ZADRA system is another elution process where gold that is adsorbed on to activated carbon is desorbed from the carbon by a reversal of the adsorption kinetics. The ZADRA elution circuit at ...
Ultrasonic elution of gold from activated carbon
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.
ACTIVATED CARBON IN GOLD RECOVERY
the activated carbon product. The characteristics of the activated carbon product are thus dependent on raw material. A hard dense raw material results in a hard dense activated carbon with a micro-pore favouring structure. A soft, less dense raw material results in a soft light activated carbon with an open pore structure. 18