adsorption of gold on cyanide

The mechanism of elution of gold cyanide from activated

Abstract. 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.

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The reversibility of adsorption of gold cyanide on

The reversibility of the adsorption of gold onto carbon is a function of the nature of the adsorbed gold and determines the need for cyanide in the elution process, which affects the operating costs of

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MODELING OF THE CARBON IN PULP (CIP) PROCESS IN GOLD

Modeling of the carbon in pulp (CIP) process in gold cyanide leaching plants 845 In Eq. 10 k 1 is rate constant for gold adsorption and k 2 is defined as rate constant for

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Quantifying the Effect of Competitive Adsorption of Gold

Nickel cyanide inhibited the adsorption of gold cyanide by 19% at 200 ppm, 16% at 100 ppm, 12% at 40 ppm and 7% at 20 ppm. Hence the inhibition of gold cyanide adsorption by nickel cyanide depends on the concentration of nickel cyanide in solution. The inhibition increases as the concentration of

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Effect of Metal Impurities on Adsorption of Gold by

adsorption of gold was determined by adding sodium gold cyanide to the synthetic feed solution, producing a gold concentration of 150 ppm. This concentration is signif. icantly higher than metal concentrations normally encoun173; tered in most gold plant solutions; however, the results are indicative of the loading phenomena.

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A TwoStage Adsorption of Cyanide Gold Complexes onto

In this paper a fundamental study has been made of the adsorption of potassium gold cyanide from water onto industrial activated carbon widely used for the recovery of gold.

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Gold Cyanide Adsorption belgianpress.be

Gold Cyanide Adsorption. ADSORPTION OF GOLD FROM CYANIDE SOLUTIONS ONTO CONSTITUENTS Download citation ADSORPTION OF GOLD F Evidence for the adsorption of reprecipitation of gold from cyanide solutions onto gangue minerals of the Witwatersrand reefs has been gathered over a number of years by various investigators.

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How Metal Impurities Affect Gold Adsorption on

Tests were also conducted to determine the effect these cyanide complex impurities might have on the adsorption of gold by the activated carbon. Metal cyanide species included in the investigation were antimony, arsenic, cadmium, calcium, cobalt, gold, iron, mercury, nickel, silver, thallium, and zinc. Tests were made over a pH range of 6.4 to

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A TwoStage Adsorption of Cyanide Gold Complexes onto

In this paper a fundamental study has been made of the adsorption of potassium gold cyanide from water onto industrial activated carbon widely used for the recovery of gold. We examined the thermodynamic reversibility of the adsorption of gold complexes by determining the adsorption/desorption isotherms of Au, Au(CN)2, and potassium counterion from pure KAu(CN)2 in

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Leaching amp; Adsorption Resource Book

Adsorption is a term used to describe the attraction of a mineral compound to the surface of another material. Activated carbon is used to adsorb the gold out of solution. Because the cyanide ion forms very strong complexes with gold, it is the gold cyanide complex that is loaded onto the carbon rather than being deposited as metallic gold.

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Adsorption studies of cyanide onto activated carbon and

Adsorption studies of cyanide onto activated carbon In this research, adsorption of cyanide onto cata plating of gold and silver [9]. Cyanide is a singlycharged anion containing unimolar amounts of carbon and nitrogen atoms triplybounded together. It is a strong ligand,

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Elution and Carbon Reactivation Resource book

Elution is the next step in the process, whereby the adsorption of the gold cyanide complex onto carbon is reversed. Loaded carbon is removed from the CIL circuit and the gold stripped from the carbon using a followed by elution with potable water, the gold cyanide complex can be induced to desorb from the carbon and return to solution. The

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Measuring pH in Cyanide Leaching Emerson

Measuring pH in Cyanide Leaching Background Process pH Measurement The activated carbon adsorbs the gold cyanide complex on the surface of the carbon particles. Later, the carbon is washed with hot silver, zinc precipitation be used instead of carbon adsorption.

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Adsorption studies of cyanide onto activated carbon and

Adsorption studies of cyanide onto activated carbon In this research, adsorption of cyanide onto cata plating of gold and silver [9]. Cyanide is a singlycharged anion containing unimolar amounts of carbon and nitrogen atoms triplybounded together. It is a strong ligand,

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Cyanide Leaching Mining SGS

The cyanide solution percolates through the ore and dissolves the gold, which is then removed from the lixiviant by adsorption onto carbon or resins. Grain size, oxygen and alkalinity levels are carefully controlled to ensure maximum gold recovery.

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The mechanism of the adsorption of gold cyanide on

Claus and Weiss2O, in studying the adsorption of gold cyanide on various activated carbons, concluded that gold adsorption is not a property of the carbon surface, since certain chemical treatments of the carbon (for example, with a mixture of nitric and hydrochloric acids at 80176;C) prevent gold adsorption.

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48. Adsorption of gold from cyanide solutions by anionic

Adsorption of gold from cyanide solutions by anionic resins Adsorption of anions on both strong and weakbase ionexchange resins is a function of the charge on the anion, its polarisability as

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The leaching and adsorption behaviour of gold ores

Kinetic models were developed for the leaching of gold from the ore, adsorption onto activated carbon and pregrobbing at the ore surface. A variable order empirical 2.4.2 Effect of zinc cyanide species on gold leaching 2.4.3 Other metalcyanide complexes 2.5 PREGROBBING OF GOLD 2.5.1 Pregrobbing by carbonaceous matter

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The leaching and adsorption behaviour of gold ores

Kinetic models were developed for the leaching of gold from the ore, adsorption onto activated carbon and pregrobbing at the ore surface. A variable order empirical 2.4.2 Effect of zinc cyanide species on gold leaching 2.4.3 Other metalcyanide complexes 2.5 PREGROBBING OF GOLD 2.5.1 Pregrobbing by carbonaceous matter

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US4528166A Recovery of gold and/or silver from cyanide

The adsorption of dissolved gold cyanide onto activated carbon is represented by Equation (1), STR1 which indicates that adsorption of gold onto the carbon is highly favoured. If the dicyanogold species in the carbon can be converted into a species that is insoluble in the aqueous loading medium, the reaction represented in Equation (1

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Adsorption of gold from cyanide leaching solution onto

In the gold hydrometallurgy industry, gold is extracted from cyanide leaching solution by adsorption onto activated carbon. The main advantages of activated carbon are its high selectivity towards gold relative to base metals, its ease of elution and its large particle size [13] , [14] , [15] .

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EFFECT OF SILVER, NICKEL AND COPPER CYANIDES ON

Besides, Zncyanide has no significant effect on adsorption of gold between pH of 6 and 12 according to the previous studies (Romero and Sampaio, 1993; Sheya and Palmer, 1989).

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ACTIVATED CARBON IN GOLD.pdf Adsorption Cyanide

especially calcium) in the pulp is important as these ions form ion pairs with the gold cyanide ion. when gold is adsorbed. Conventionally.ion in solution.8 TEMPERATURE The adsorption of the calcium gold cyanide ion pair by activated carbon is an exothermic occurrence. Various forms of silica (e.

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A TwoStage Adsorption of Cyanide Gold Complexes

In this paper a fundamental study has been made of the adsorption of potassium gold cyanide from water onto industrial activated carbon widely used for the recovery of gold. We examined the thermodynamic reversibility of the adsorption of gold complexes by determining the adsorption/desorption isotherms of Au, Au(CN) 2 , and potassium

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Cyanide

A cyanide is a chemical compound that contains the group CN. This group, known as the cyano group, consists of a carbon atom triplebonded to a nitrogen atom.. In inorganic cyanides, the cyanide group is present as the anion CN .For the salts such as sodium cyanide and potassium cyanide, these compounds are highly toxic. Hydrocyanic acid, also known as hydrogen cyanide, or HCN, is a

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The mechanism of the adsorption of gold cyanide on

Claus and Weiss2O, in studying the adsorption of gold cyanide on various activated carbons, concluded that gold adsorption is not a property of the carbon surface, since certain chemical treatments of the carbon (for example, with a mixture of nitric and hydrochloric acids at 80176;C) prevent gold adsorption.

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Gold Mining Process Development Denver Mineral Engineers

GOLD MINING amp; WATER TREATMENT PROCESS EQUIPMENT. Home; Consulting Services; Gold cyanide is adsorbed into the pores of activated carbon, resulting in a strong solution of hot caustic and cyanide to reverse the adsorption process and strip the carbon of gold. Gold is then removed from the solution by electrowinning. Stripped carbon is

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A TwoStage Adsorption of Cyanide Gold Complexes onto

In this paper a fundamental study has been made of the adsorption of potassium gold cyanide from water onto industrial activated carbon widely used for the recovery of gold.

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CarboninPulp CIP Gold Adsorption from Cyanide Leach Slurry

The process comprises treatment by cyanide leaching and subsequent adsorption of gold from leach slurries by carboninpulp methods. The jig tailing was about 90 pct minus 100 mesh; the samples submitted contained from 0.33 to 0.42 oz/ton Au and a minor but valuable amount of silver.

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Quantifying the Effect of Competitive Adsorption of Gold

carbon or prevent the adsorption of gold cyanide even at as high concentrations as 1000 ppm [5]. 0 20 40 60 80 100 120 0 50 100 % adsorption of AuCN. Time in minutes for adsorption 0ppm 20ppm 40ppm 100ppm 200ppm. Fig 4 Effect of iron cyanide on gold cyanide adsorption. Silver cyanide inhibited gold cyanide adsorption by 26% at 200 ppm, 17% at 100 ppm, 16% at 40 ppm and by 11% at 20 ppm.

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