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elution of gold from activated carbon

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  • Selective elution of gold, silver and mercury cyanide from

    Nov 01, 2010A highpressure laboratory elution rig was commissioned to simulate industrial Zadra and AARL elution conditions for the stripping of gold, silver and mercury from loaded activated carbon. It was found that cyanide was essential for the efficient elution of both mercury and silver, while gold was found to elute most effectively in hot, lowionic strength

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  • 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 pregrobbing gold ores. Four stripping techniques atmospheric Zadra, syringe and press, syringe

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  • Fundamentals of the elution of gold cyanide from activated

    Although the loaded carbon contained only Au CN2, 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

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  • Elution behaviour of metals from carbonSAIMM

    The gold cyanide is adsorbed by activated carbon, which is subsequently eluted to produce a concentrated gold solution. The eluted solution is electrowon to recover the precious metals alternatively, zinc precipitation may be used, and the carbon is treated in aThe gold elution profiles at 130Inquire Now

  • The elution of gold from activated carbon using deionized

    Group Dynamics in Occupational Therapy: the Theoretical Basis and Practice Application of Group Intervention Sull'eternitInquire Now

  • The elution of gold from activated carbon using

    The pretreatment of goldloaded activated carbon with a relatively strong sodium cyanide solution prior to elution with deionized water at 90 to 125Inquire Now

  • SOTAGOLD

    During the elution of gold from activated carbon, the carbon undergoes chemical and mechanical attrition. Amount of the wornout goldcontaining carbon, which can be collected and processed at gold recovery plants, is evaluated at the rate of 2025 kg per 1 ton of activated carbon treated during the elution. In our estimation, the losses of

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  • AARL Carbon Stripping System Operation: Elution

    Mar 31, 2016The stripping of gold from loaded carbon here involves two basic steps; Acid Washing and Elution.Elution and Carbon Cool. During the elution cycle, water is drawn from the potable water tank and pumped

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  • The mechanism of elution of gold cyanide from activated

    Up to10%cash backWhen the concentration of cations in the eluant is high and no cyanide is present in the solution or on the carbon, very little desorption of gold is observed. The quantitative effect of the concentration of spectator cations on the equilibrium for desorption of aurocyanide can be estimated from the elution profiles for gold and cations.

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  • Fouling of carbon, regeneration and ElutionGold Metallurgy

    Apr 02, 2016Elution of gold from carbon. Over the last 10 years there has been much research and development into elution procedures, all trying to improve on the traditional Zadra Process [37] which takes days to complete. Recent studies by Adams and Nicol on the kinetics of elution [38] show that NaCN is more effective than NaOH as an eluant and that

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  • Elution and Carbon ReactivationResource book

    Elution involves removing the gold from the activated carbon by reversing the adsorption process that occurs in the CIL circuit refer Leach and Adsorption module.

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  • Free PDF Coppergold ore processing with ion exchange

    Coppergold ore processing with ion exchange and SART technologyThis helps to suppress is not practically feasible to use conventional activated carbon to the adsorption of copper on the resin Dai et al., 2010 by encour adsorb the gold.Elution There are three elution columns, operated in parallel; each is 2NaAgInquire Now

  • Elution of Gold from Activated Carbon Using Supercritical

    Aug 20, 2006Abstract. A novel method for the desorption of gold from activated charcoal is reported. Ion pair solvation of sodium dicyanoaurate I Na +AuCN 2by tributylphosphate facilitates the charge neutralization necessary for the elution of the ionic AuCN 2by the nonpolar supercritical carbon dioxide. The method is sensitive to pressure and temperature, and

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  • 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.

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  • A review of the AARL process for the elution of gold from

    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

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  • Factors affecting the elution of gold cyanide from

    Jan 01, 1994The In A values for gold cyanide in contact with activated carbon at different pH values yielded a straight line: A = 113 exp 0.16 pH 4 Room temperature and a constant [K+] = 1100 g/m3 were used. When the experiment was repeated at 40 and [K+] = 1500 g/m3, the constants in Eq.

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

    Aug 01, 1994One 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

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  • ACTIVATED CARBON IN GOLD RECOVERYKemix

    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 micropore favouring structure. A soft, less dense raw material results in a soft light activated carbon with an open pore structure. 18

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  • 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 pregrobbing gold ores. Four stripping techniques atmospheric Zadra,

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  • WO2016104113A1Method 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

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

    Aug 01, 1994One 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

    Inquire Now
  • Elution behaviour of metals from carbonSAIMM

    The gold cyanide is adsorbed by activated carbon, which is subsequently eluted to produce a concentrated gold solution. The eluted solution is electrowon to recover the precious metals alternatively, zinc precipitation may be used, and the carbon is treated in aThe gold elution profiles at 130Inquire Now

  • [PDF] The elution of gold from activated carbon using

    Because the mechanism of elution after pretreatment entails the shifting of a physical rather than a chemical equilibrium, the higher the gold loading on the activated carbon, the more efficient is the elution procedure. When compared with other elution procedures, the proposed method appears to have several economic advantages.

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  • US6200364B1Process for eluting precious metals from

    A process is disclosed for the recovery of gold and/or silver values from activated carbon, wherein they are adsorbed as cyanide complexes. The process uses an eluant containing sugar. The process allows the eluant to pass through fresh carbon twice, thereby reducing the volume of the goldloaded eluant. This, in turn, reduces the size of the electrowinning or zinc

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  • Isopropyl Alcohol Elution of Gold Adsorbed on Activated Carbon

    Jan 01, 2017Activated carbon loaded with gold is then eluted and gold is subsequently recovered by electrochemical methods. Conventional elution processes such as atmospheric and pressurized Zadra processes, involve stripping with a cyanide 0.10.2% NaCN and sodium hydroxide solution 12% NaOH at high temperature 90140Inquire Now

  • Elution of Gold from Activated Carbon Using Supercritical

    Aug 20, 2006Abstract. A novel method for the desorption of gold from activated charcoal is reported. Ion pair solvation of sodium dicyanoaurate I Na +AuCN 2by tributylphosphate facilitates the charge neutralization necessary for the elution of the ionic AuCN 2by the nonpolar supercritical carbon dioxide. The method is sensitive to pressure and temperature, and

    Inquire Now
  • The elution of gold from activated carbon at room

    Aug 01, 1994Elution 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 NaOHabout 10 bedvolumes of eluant The initial rate was slow over the first hour of elution, probably because the activated carbon catalysed the oxidation of sulphide to polysulphide.

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  • Adsorption Capacity of Gold on Activated Carbon

    Activated carbon hasalready been used successfully in commercial processes1that require the removal of smallamounts ofgold2mg.II andsilverfromcyanidereduction ofthe AuCN; complex to metallic gold. Their investigation26 into the elution ofgold adsorbed on coal carbon from cyanide solution showed that complete elution ofthe gold

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  • THE EFFECT OF ACTIVATED CARBON PARTICLE SIZE

    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 pregrobbing gold ores.

    Inquire Now
  • ACTIVATED CARBON IN GOLD RECOVERYKemix

    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 micropore favouring structure. A soft, less dense raw material results in a soft light activated carbon with an open pore structure. 18

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  • AARL Carbon Stripping System Operation: Elution

    Mar 31, 2016Elution stage During this stage the gold and silver desorbed off the carbon during the preheat .* is washed out of the column into the eluate tank. This stage takes 2 1/2 hours and involves the use of 5 bed volumes of potable water 21.6 cubic metres. The critical factor during this stage is temperature.

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  • [PDF] The elution of gold from activated carbon using

    The pretreatment of goldloaded activated carbon with a relatively strong sodium cyanide solution prior to elution with deionized water at 90 to 125i?Inquire Now

  • ACTIVATED CARBON IN GOLD RECOVERYKemix

    Macropores 500 to 2000 Inquire Now

  • Carbon StrippingDenver Mineral Engineers

    Many methods are used commercially for recovering gold and silver from loaded activated carbon. The major processes include: 1 Atmospheric Zadra StrippingMicron Elution Procedure. Each process is briefly described. Variations to and combinations of the basic methods are also highlighted. The advantages and disadvantages of each procedure

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  • Fundamentals of the elution of gold cyanide from activated

    Although the loaded carbon contained only Au CN2, 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

    Inquire Now
  • PDF Kinetics of elution of gold from activated carbon by

    May 01, 1990From the interface the gold then diffuses through a liquid film into the bulk of the liquid. A linear isotherm was used to describe the equilibrium which was later shown by Adams 1990 to be only

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