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The effect of temperature on the desorption of gold cyanide from activated carbon . By van Deventer J.S.J. and van der Merwe P.F. ... The elution of gold cyanide is usually conducted by soaking the loaded carbon in an alkaline solution of cyanide in a column, followed by a rinse with water at temperatures higher than 100° C. ...
point, and experiments suggest the possibility of an optimum cyanide concentration, beyond which elution efficiency starts decreasing. Introduction The carbon-in-pulp or carbon-in-leach (CIP and CIL) processes have been the main commercial processes on almost every gold plant built since 1980 (Fleming, 1992; Van Deventer, 1984).
Whereas Au(CN){2 /-} is soluble in water, AuCN and Au require the addition of cyanide to form Au(CN){2 /-}. 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 a carbon-in-pulp (CIP) plant.
Mar 01, 2003· Ultrasonic elution of gold from activated carbon Ultrasonic elution of gold from activated carbon Feng, D; Tan, H; van Deventer, J.S.J 2003-03-01 00:00:00 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.
Minerals Engineering, Vol. 7, No. I, pp. 71-86, 1994 0892-.-6875/94 $6.00+0.00 Printed in Great Britain 1993 Pergamon Press Lid FACTORS AFFECTING THE ELUTION OF GOLD CYANIDE FROM ACTIVATED CARBON J.S.J. van DEVENTER and P.F. van der MERWE Department of Metallurgical Engineering, University of Stellenbosch, Private Bag X5018, Stellenbosch, 7600, South Africa .
Fundamentals of the elution of gold cyanide from activated carbon. [Pieter F Van der Merwe] Home. WorldCat Home About WorldCat Help. Search. Search for Library Items Search for Lists Search for Contacts Search for a Library. Create ...
P. F. Van Der Merwe's 7 research works with 107 citations and 2,007 reads, including: Kinetic Model for the Decomposition of Cyanide during the Elution of Gold from Activated Carbon
This compares reasonably well with the shape of the elution profiles at this temperature found in the literature (Van der Merwe, 1991). Typical industrial gold elution temperatures range from 110–130°C. As previously been shown in Figure 6, the amount of metal on the carbon affects the rate of adsorption of PGMs onto the carbon.
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 gold-loaded eluant. This, in turn, reduces the size of the electrowinning or zinc precipitation circuits.
Van der Merwe [31] with the increase in solution temperature, thereby decreasing the reported that log–log plots of the equilibrium metal loading versus adsorption capacity [36]. the pH for four sets of published data resulted in straight lines in Adsorption of iron cyanide (FeCN) indicated that adsorption all .
The next process involves electrowinning, which uses electrolysis to separate the cyanide (remaining in solution) and gold (sediment at bottom) (e.g. van Deventer and van der Merwe, 1994). The gold sediment is finally mixed with a little Borax, and smelted, returning in the form of solid gold.
Discussion on the kinetics of the elution of gold from activated carbon ... The contributions of H. Jacobs and M.F. Van der Merwe who confirmed the findings as part of a final year student project ... Jc = flux of gold cyanide across the outer carbon layer
treatment on elution of gold Stellenbosch University. agitation showed a decrease of about 10% in Au elution recovery when the agitation .. Deventer and Van Der Merwe (1994), high pre treatment temperature yields The CIP circuit is a well known technology in gold processing. ..
Fundamentals of the elution of gold cyanide from activated carbon. Van der Merwe, Pieter F.(Pieter Francois) (1991) ... Models were then developed to simulate the changes in· cyanide and potassium concentrations during the elution of the gold cyanide. This enabled the calculation of a shifting gold cyanide equilibrium isotherm as a function of ...
Whereas Au(CN) 2 − is soluble in water, AuCN and Au require the addition of cyanide to form Au(CN) 2 −. 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 a carbon-in-pulp (CIP) plant.
Van Deventer and Van der Merwe (1994) developed a generalised model to simulate the more complex AARL process. Equilibrium conditions may be assumed in an elution column when adsorption is weak, while diffusional phenomena become rate controlling when desorption is weak towards the end of a elution cycle. o 5 10 15 BEDVOLUMES
Abstract Free cyanide is usually present during the elution of gold cyanide from activated carbon. The decomposition of cyanide is important not only in the extraction of gold but also for environmental reasons. Previous studies have indicated that competitive adsorption of cyanide with aurocyanide plays a minor role at the elevated temperatures used in industry.
has been made in understanding the mechanisms and kinetics of gold adsorption onto activated carbon (Van Deventer and Van Der Merwe 1994). Alternative processing options that are less energy-intensive and are more able to deal with complex, lower grade ores are in demand, and according to Liddell and Adams (2012), there is
This compares reasonably well with the shape of the elution profiles at this temperature found in the literature (Van der Merwe, 1991). Typical industrial gold elution temperatures range from 110–130°C. As previously been shown in Figure 6, the amount of metal on the carbon affects the rate of adsorption of PGMs onto the carbon.
The mechanism of elution of gold cyanide from activated carbon: Authors: van Deventer, J. S. J.; van der Merwe, P . F. ... 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. ... The dynamics of ...
from active carbon surface venter (van De and van der Merwe, 1994). The organic solvent, either ethanol or acetonitrile, is able to increase CN-and Au(CN) 2-activities. As a result, the released ... size of activated carbons with gold cyanide for subsequent elution experiments as set-up in Figure 1. Coarse granular activated
The mechanism of gold lock-up in refractory wood chips The mechanism of gold lock-up in refractory wood chips Petersen, F.W.; Van Der Plas, P.J.; Van Zyl, C.J. 1997-11-01 00:00:00 Activated carbon has for long been the preferred adsorbent for the recovery of gold from leached slurries. Wood chips, produced by underground blasting, are moved with the gold-bearing material to the carbon-in-pulp ...
(Van der Merwe, 1991). During the electrowinning procedure, gold metal is recovered by an electrolytic process, whereby the gold deposits onto the cathode. The laden gold cathodes may contain 7075% gold and 10-15% silver, the remaindPf being copper and steel wool.
van Deventer J.S.J.; van der Merwe P.F. (1994) Article Functional relationships were determined between the effects of pH, temperature, and the concentrations of cyanide and cations on the gold cyanide equilibrium during elution from activated carbon in columns and in batch reactors.
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