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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.
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 ...
The presence of spectator cations (M n+) enhances the formation of M n+ {Au(CN) 2 −} n ion pairs on the carbon, which in turn suppress the elution of gold cyanide. The dynamics of removal of these cations determine the horizontal position of the gold peak in an elution profile.
Cyanide is added to the feed to the CIL at the trash screen under pan to maximise the gold dissolution. Gravity gold is collected and treated by the Knelson concentrators followed by an intensive cyanidation using the ILR3000BA. The In-line Leach Reactor (ILR) was commissioned in December 2012.
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
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
Van der Merwe (1991) and Stange (1991) showed that the elution of gold is dependent on the removal of the sodium or potassium introduced in the pre-treatment step. The extent of cyanide decomposition determines the passivation of the carbon surface and the decrease in the equilibrium isotherm for gold loading (Van der Merwe, 1991).
Fundamentals of the elution of gold cyanide from activated carbon . By Pieter F.(Pieter Francois) Van der Merwe. Abstract. Dissertation (Ph. D. (Ing.)) -- University of Stellenbosch, 1991.Full text to be digitised and attached to bibliographic record
van der Merwe, 1994). ... can be incorporated into a dynamic model describing a continuous shift in the adsorption/desorption equilibrium as elution proceeds.The elution of gold cyanide is ...
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).
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 ...
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 .
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.
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 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. ...
(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.
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.
Kinetic Model for the Decomposition of Cyanide during the Elution of Gold from Activated Carbon J. S. J. VAN DEVENTER and P. F. VAN DER MERWE DEPARTMENT OF CHEMICAL ENGINEERING UNIVERSITY OF STELLENBOSCH PRIVATE BAG X5018, STELLENBOSCH, 7600, SOUTH AFRICA ABSTRACT Free cyanide is usually present during the elution of gold cyanide from activated
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. ..
desorption of gold and silver from activated carbon Experiments of gold and silver elution were conducted using several parameters, either fixed or varying parameters. Ethanol volume, temperature and percent solid belonged to varying parameters while loaded carbon, stirring rate, concentrations of NaOH and NaCN served as fixed parameters.
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.
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.
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
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