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gold elution from activated carbon

gold elution from activated carbon

  • 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 presoaked with 5% w/v NaCN/1% w/v NaOH solution This process is sensitive to the quality of water usedFig IThe elution of gold, silver and nickel from activated carbon after pretreatment with 10 per cent potassium carbonate5 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 carbonate would suffice FigThe elution of gold from activated carbon usingSimilar elution data are plotted in curve C, which illustrates the elution of gold from activated carbon loaded with 4,1 per cent gold, 1200 gjt silver, and 1700 gjt nickel (Fig 6) In this series of elution investigations at high gold loadings, the carbon was not washed with acid before the elution, but this omission appeared to have littleThe elution of gold from activated carbon using deionized

  • The elution of gold from activated carbon at room

    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 bedvolumes of eluant The initial rate was slow over the first hour of elution, probably because the activated carbon catalysed the oxidation ofIn previous papers the mechanism and dynamics of the elution of gold cyanide from activated carbon have been investigated in detail Sub processes such as(PDF) Kinetics of elution of gold from activated carbon byA plugflow 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 toModeling of gold elution from activated carbon using a

  • 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 ofThe cyanideage 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 cyanideage on the desorption of gold cyanide, five samples of carbon were loaded with gold to the same levelFactors affecting the elution of gold cyanide fromThe 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 pregrobbing gold ores Four stripping techniques (atmospheric Zadra,THE EFFECT OF ACTIVATED CARBON PARTICLE SIZE ON

  • Elution behaviour of metals from carbon SAIMM

    Elution behaviour of metals from carbon M JEFFREY, R PLEYSIER, and K BUNNEY Parker Centre (CSIRO Minerals), Australian Minerals Research Centre, Australia This study investigated the elution of precious and toxic metals from activated carbon Gold and mercury are of primary interest, due to their value and environmental impact respectivelyFig IThe elution of gold, silver and nickel from activated carbon after pretreatment with 10 per cent potassium carbonate5 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 carbonate would suffice FigThe elution of gold from activated carbon usingOne of the main bottlenecks in the carboninpulp 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] The elution of gold from activated carbon at room

  • The elution of gold from activated carbon at room

    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 bedvolumes of eluant The initial rate was slow over the first hour of elution, probably because the activated carbon catalysed the oxidation ofAbstract 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 tributylphosphate facilitates the charge neutralization necessary for the elution of the ionic Au(CN) 2 − by the nonpolar supercritical carbon dioxide The method is sensitive to pressure and temperature, and the static (no CO 2Elution of Gold from Activated Carbon Using SupercriticalNumerous 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 ofThe mechanism of elution of gold cyanide from activated

  • Elution of gold from activated carbon equipment China

    Changchun Gold Research Institute CoLTD [Jilin,China] Business Type:Manufacturer Main Markets: Worldwide Exporter:41% 50% Certs: ISO9001 Description:Small Scale Gold Ore Processing,Elution Gold from Activated Carbon Equipment,Gold Sulphide Ore ProcessingDiscussion 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 conditionsDiscussion on the kinetics of the elution of gold fromA model for the Zadra elution process was developed based on pore diffusion inside the carbon particles, the dispersed plug flow in the elution column, and the gold desorption from carbon as a first order reaction A set of process description equations was obtainedA Reactor Model for Gold Elution From Activated Carbon

  • Gold elution process sluganarodu

    Gold elution process BACKGROUND—FIELD OF INVENTION This invention relates to the recovery of precious metals from activated carbon, specifically to an improved elution process BACKGROUND—DESCRIPTION OF PRIOR ART Cyanidation is commonly employed for the extraction of gold from its ores In this process, the crushed ore is treated with a diluteAlthough 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 theFundamentals of the elution of gold cyanide fromFig IThe elution of gold, silver and nickel from activated carbon after pretreatment with 10 per cent potassium carbonate5 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 carbonate would suffice FigThe elution of gold from activated carbon using

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

    One of the main bottlenecks in the carboninpulp 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 temperaturesAbstract 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 tributylphosphate facilitates the charge neutralization necessary for the elution of the ionic Au(CN) 2 − by the nonpolar supercritical carbon dioxide The method is sensitive to pressure and temperature, and the static (no CO 2Elution of Gold from Activated Carbon Using SupercriticalA model for the Zadra elution process was developed based on pore diffusion inside the carbon particles, the dispersed plug flow in the elution column, and the gold desorption from carbon as a first order reaction A set of process description equations was obtainedA Reactor Model for Gold Elution From Activated Carbon

  • 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 the conditionsGold elution process BACKGROUND—FIELD OF INVENTION This invention relates to the recovery of precious metals from activated carbon, specifically to an improved elution process BACKGROUND—DESCRIPTION OF PRIOR ART Cyanidation is commonly employed for the extraction of gold from its ores In this process, the crushed ore is treated with a diluteGold elution process sluganaroduThe 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 pregrobbing gold ores Four stripping techniques (atmospheric Zadra, syringe and press, syringe pump, and filterThe effect of activated carbon particle size on gold

  • 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, eg 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 macroporesattaches into active carbon depress the to Au(CN) 2and Ag(CN) free from active carbon surface (van sDeventer and van der Merwe, 1994) Experiments for goldsilver desorption process from activated carbon employed several parameters either fixed or changeable Loaded carbon, stirring rate, the concentration of NaOH and NaCN belongedDESORPTION OF GOLD AND SILVER FROM ACTIVATEDAn elution will start when there is 6 ton of loaded carbon in the measuring vessel The caustic solution that returns from the electrowinning circuit is pumped into the eluant tanks This solution is sent through a primary heat exchanger where the heat from the exiting solution ofOPTIMIZING THE OPERATING CONDITIONS OF GOLD

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