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#0183;#32;This study reports on the extraction of gold cyanide by polymeric adsorbents and ionexchange resins and demonstrates that, as in the case of ionpair solvent extraction (Part I), the adsorptive behaviour of Au(CN) 2 in the presence of various cations onto polymeric adsorbents is analogous to the adsorptive behaviour onto activated carbon (Part III).
Abstract Research investigations on the chemistry of the adsorption of gold cyanide on activated carbon have mostly reduced the role of activated carbon as the provider of the large surface area needed for adsorption. Most do not go beyond suggesting that oxygen functional groups on carbon play a key role in the adsorption process. Our research shows that the nature of the material
#0183;#32;Cyanide remains the dominant method of recovery of precious metals such as gold and silver, and Au(CN) 2 is the main goldcyanide species used in cyanide leaching of gold . Quartz is a typical gangue mineral in gold ores, and the adsorption of gold complexes onto quartz has received significant attention in the past.
#0183;#32;Impregnated ionexchange resins None of these weakbase systems are commercially available nowadays and efforts to prepare solid materials for goldcyanide extraction have promoted the evaluation or different approaches: the use of nonionic polymeric adsorbents as Amberlite XAD7 [27], development of organophosphorus polystyrene supported phosphonates ester based resins [28] and
The large surface area is necessary because the surface provides the sites on which the adsorbed materials reside. Although they also increase the surface area, charring and partial oxidation are believed to give rise to the chemical properties of activated carbon. Partial oxidation (activation) of carbon produces ionizing and nonionizing functional groups on the activated carbon surface. The
#0183;#32;After cyanide leaching, the cyanidation solution was transferred to a tumble bottle and all adsorption experiments of gold were conducted by means of the traditional bottleonrolls method. Experiments were performed at the desired agitation rate and pH by placing a weighed amount of the activated carbon with 1000 ml of the gold cyanide solution.
Abstract Activated carbon has had a tremendous impact on the technology of gold recovery from leached liquors. Ionexchange resins have been proposed as possible alternatives to carbon, while ionexchange fibers and membranes were investigated recently as adsorbents for metal recovery in view of their fast rate of uptake. This paper deals with the competitive adsorption of organic compounds
GOLD SELECTED ION EXCHANGE RESIN VS ACTIVATED CARBON FOR RECOVERY OF GOLD Figure 3: Effect of free cyanide concentration on Cu(I) speciation at 10 mg/L Cu and pH 10(4) Gold Recovery Via Activated Carbon from Cyanide Liquors Containing Cuprous Cyanocomplexes Activated carbon is widely used for gold recovery from cyanide leach liquors via carbon
The interaction of gold cyanide complex with elemental sulphur and all metastable and crumb (984%), it was found to negatively influence adsorbent loading of Au3+ ions onto the adsorbents.
#0183;#32;This paper deals with the competitive adsorption of organic compounds and gold cyanide onto activated carbon, ionexchange resin, ionexchange fiber, and membrane. Loadings of organic compounds were measured on gold equilibrated adsorbents and compared to loadings on adsorbents.
#0183;#32;Adsorption experiments Gold cyanide was adsorbed on each adsorbent by contacting from to 5 g of the adsorbent with 100 ml of gold cyanide solution in 125 ml polypropyl i''AIILE I of carbonaceous adsorbents (''ode Material Description, use Source (''!
Ion exchange resins composed of a polymeric matrix functionalized with a piperazine group are suitable for separating gold cyanide from aqueous medium containing gold cyanide complex and other metal cyanide complexes in a process wherein the gold cyanide complex is preferentially retained on the piperazinefunctionalized ion exchange resin and can be eluted with thiourea or a mixture of NaOH
Request PDF | Carbon adsorbents used for gold recovery technology with cyanide | The Dubinin method based on the theory of micropore volume filling was used to study the structural and energetic
Abstract Much progress has been made during the last decade on carboninpulp and resininpulp technology for the extraction of gold and silver from leached pulps. In this study a systematic investigation was conducted on the mass transfer of gold cyanide to activated carbon and ionexchange resins in suspended solids under conditions of different gold solutionphase concentrations.
Request PDF | Carbon adsorbents used for gold recovery technology with cyanide | The Dubinin method based on the theory of micropore volume filling was used to study the structural and energetic
Certain neutral polymeric adsorbents such as the polyacrylates XAD7 and XAD8 were discovered to exhibit modest capacities for the loadiny of gold from alkaline cyanide solutions. The adsorption characteristics of these resins were examined as a function of pH, ionic strength, and temperature.
The Dubinin method based on the theory of micropore volume filling was used to study the structural and energetic characteristics of a series of commercial microporous carbon adsorbents used for goldrecovery technology with cyanide. Analysis of microporous structure characteristics showed that the characteristic dimensions of the adsorbents are close to nm.
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