Carbon in pulp Wikipedia

The final loaded carbon then is removed and washed before undergoing elution or desorption of gold cyanide at high temperature and pH Ethanol can also be used to desorb gold from activated carbon but safety concerns have slowed its acceptance in the gold extraction industry Electrowinning The elute solution normally consisting of caustic

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

SOTAGOLD

During the elution of gold from activated carbon the carbon undergoes chemical and mechanical attrition Amount of the worn out gold containing carbon which can be collected and processed at gold recovery plants is evaluated at the rate of 20 25 kg per 1 ton of activated carbon treated during the elution

Chapter 32

The elution efficiency is shown in Table 1 and proves that cyanide ion has no effect on the gold recovery from peat or coconut derived carbon the residual gold on the carbons in these tests at 95 C would represent the equilibrium isotherm value Table 1 Gold elution

AARL Carbon Stripping System Operation Elution

During this stage a 2 caustic 3 cyanide solution mixture is re circulated through the loaded carbon in the elution column until such time as a predetermined top of column temperature is reached By this time most of the gold and silver on the carbon will have been desorbed into solution and both the carbon and the solution will have reached an optimum temperature for the subsequent

Activated Carbon in Gold Cyanidation

The feasibility of using ultrasound to enhance the elution of gold from activated carbon was investigated A laboratory scale elution column immersed in an ultrasonic bath was used to investigate three eluant systems The kinetic activity of the activated carbon was improved in the elution

Ultrasonic elution of gold from activated carbon

The feasibility of using ultrasound to enhance the elution of gold from activated carbon was investigated A laboratory scale elution column immersed in an ultrasonic bath was used to investigate three eluant systems The kinetic activity of the activated carbon was improved in the elution

Gold recovery from loaded activated carbon using different

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 carbon Arriagad and Garcia 1997 Bryson 1995 Petersen and Van Deventer 1997 Streat and Naden 1987 Yalcin and Arol 2002

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 e g 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 macropores

CHAPTER 3 ACTIVATED CARBON COLUMNS PLANT DESIGN

CHAPTER 3 ACTIVATED CARBON COLUMNS PLANT DESIGN 116 FIGURE 4 1 TYPICAL PRESSURE DROP CURVE FOR A BACKWASHED AND SEGREGATED BED Secondly it was necessary to calculate pressure drop in the filter disc that is going to support activated carbon bed in the column This is a 50 mm filterdisc

OPTIMIZING THE OPERATING CONDITIONS OF GOLD

Base metals that have not been stripped during the elution will build up in the carbon and will affect the gold loading in the CIP process The continuous decrease of gold content in the stream and the variability of flow rate and temperature affect the elution and

Gold Recovery System Saubatech

During the elution process activated carbon that is deemed too fine for re use is removed This fine carbon residue contains on average between 50 to 200 grams of Gold per ton In the past these carbon fines were discarded or had to be recovered in chemical plants that cannot achieve industrial scale and had high operating costs

Minerals Metallurgical Processing

A high pressure 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 low

Factors affecting the elution of gold cyanide from

The cyanide age 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 cyanide age on the desorption of gold cyanide five samples of carbon were loaded with gold to the same level

Theuseofactivated carbonfortherecoveryof

cient means ofgold elution6 and gold electrowinning8 together witharelatively inexpensive method ofthermal regeneration ofthe carbon have allbeendemonstrated atpilot plant level9 Thesedevelopments intherecovery ofgoldfromboth solutions andpulps haveundoubtedly made the use of activated carbon technically and economically moreattractive

PDF The Elution Of Gold From Activated Carbon At Room

The Elution Of Gold From Activated Carbon At Room Temperature Using Sulphide Solutions Article PDF Available in Journal South African Institute of Mining and Metallurgy · August 1994 with

Elution and Carbon Reactivation Resource book

adsorbing onto activated carbon 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 number of treatment steps The result is a solution of high gold concentration pregnant eluate

Factors affecting the elution of gold cyanide from

The elution of gold cyanide is suppressed by the presence of cations M n through the formation of M n Au CN 2 − on the carbon The horizontal position of the gold peak in an AARL elution profile was found to be a function of the elution of the cations from the carbon bed

Production of Gold Biomedical Engineering

Unit 400 – Carbon Adsorption and Elution The adsorption of gold from the pregnant leach solution onto the activated carbon is the key step in the recovery process This recovery begins when the leach filtrate is sent to the carbon columns CIC 401 via Stream 29 Gold is adsorbed onto the activated carbon

Factors affecting the elution of gold cyanide from

The elution of gold cyanide is suppressed by the presence of cations Mn through the formation of Mn Au CN 2 on the carbon The horizontal position of the gold peak in an AARL elution profile was found to be a function of the elution of the cations from the carbon bed

Characterization and recovery of gold associated with fine

The attrition of activated carbon and the loss of gold associated with it is of significant economic importance to the operation of a CIP CIL circuit The focus of this study was on activated carbon recovered from an elution circuit which was deemed too fine for reuse Results of cyclosizer and laser particle size analysis identified that most

Solvent elution of gold from C I P carbon Murdoch

The effectiveness of the solvents in promoting gold desorption from activated carbon is in the order acetonitrile methyl ethyl ketone ⩾ acetone ⪢ dimethylformamide ethanol Aqueous acetonitrile and aqueous acetone strip gold in 8 h using 2–3 bed volumes at temperatures between 25 and 70°C These organic solvents in particular are strongly adsorbed onto carbon and significantly

THE CHEMISTRY OF THE CARBON IN PULP PROCESS

a Processes for Elution of Aurocyanide frcm Activated Carbon b Chemistry and Mechanism of Elution of Aurocyanide from Activated Carbon 5 2 Novel Studies on the Mechanism of Elution of Aurocyanide from Activated Carbon 5 3 Kinetics of Elution of Aurocyanide from Activated Carbon a Effect of Finite Constant Concentration of Gold in Eluant Feed

Elution of gold from carbon by the micron solvent

The desorption of gold from activated carbon is promoted by adding organic solvents to aqueous cyanide solutions At 65–80°C the elution of gold is fast and is not affected by water quality The Micron procedure involves pretreatment of the loaded carbon with NaCN NaOH followed by elution with methanol vapour and condensate Carbon is packed into a column above the distillation pot and acts

Kinetic Model for the Decomposition of Cyanide during the

Sep 23 2006· Based on these observations a kinetic model was proposed for the decomposition and elution of cyanide in packed columns of activated carbon The oxidation and hydrolysis reactions in the bulk solution as well as in the carbon pores were combined

Elution of Gold from Activated Carbon Using Supercritical

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 neutralization necessary for the elution of the ionic Au CN 2 − by the non polar supercritical carbon dioxide The method is sensitive to pressure and temperature and the static no CO 2 flow

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

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 eluant water quality and eluate flowrates

TECHNICAL PAPER Purolite

3 GOLD SELECTED ION EXCHANGE RESIN VS ACTIVATED CARBON FOR RECOVERY OF GOLD PUROLITE TECHNICAL PAPER GOLD SELECTED ION EXCHANGE RESIN VS ACTIVATED CARBON FOR RECOVERY OF GOLD INTRODUCTION Volatile gold prices in the face of rising costs for mining and refining is forcing mines to look for new ways to reduce costs and increase recoveries

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