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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 pretreatment 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).
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 ...
(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 1015% silver, the remaindPf being copper and steel wool.
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 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.
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 carboninpulp (CIP) plant.
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.
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
The elution of gold from activated carbon using deionized water // Journal of the South African Institute of Mining and Metallurgy. — 1997. ... — ISSN X. (англ.) Van Deventer, J. S. J., Van Der Merwe, P. F. The mechanism of elution of gold cyanide from activated carbon // Metallurgical and Materials Transactions B. — 1994.
The mechanism of gold lockup in refractory wood chips The mechanism of gold lockup in refractory wood chips Petersen, ; Van Der Plas, ; Van Zyl, 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 goldbearing material to the carboninpulp ...
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. ..
van Deventer ; van der Merwe (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.
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 ...
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, text to be digitised and attached to bibliographic record
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.
from active carbon surface venter (van De and van der Merwe, 1994). The organic solvent, either ethanol or acetonitrile, is able to increase CNand Au(CN) 2activities. As a result, the released ... size of activated carbons with gold cyanide for subsequent elution experiments as setup in Figure 1. Coarse granular activated
Minerals Engineering, Vol. 7, No. I, pp. 7186, 1994 0892.6875/94 + Printed in Great Britain 1993 Pergamon Press Lid FACTORS AFFECTING THE ELUTION OF GOLD CYANIDE FROM ACTIVATED CARBON van DEVENTER and van der MERWE Department of Metallurgical Engineering, University of Stellenbosch, Private Bag X5018, Stellenbosch, 7600, South Africa .
Mar 01, 2003· Ultrasonic elution of gold from activated carbon Ultrasonic elution of gold from activated carbon Feng, D; Tan, H; van Deventer, 00:00:00 The feasibility of using ultrasound to enhance the elution of gold from activated carbon was investigated. A laboratoryscale elution column immersed in an ultrasonic bath was used to investigate three eluant systems.
van der Merwe, 1994). ... can be incorporated into a dynamic model describing a continuous shift in the adsorption/desorption equilibrium as elution elution of gold cyanide is ...
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 energyintensive and are more able to deal with complex, lower grade ores are in demand, and according to Liddell and Adams (2012), there is
Discussion on the kinetics of the elution of gold from activated carbon ... The contributions of H. Jacobs and 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
point, and experiments suggest the possibility of an optimum cyanide concentration, beyond which elution efficiency starts decreasing. Introduction The carboninpulp or carboninleach (CIP and CIL) processes have been the main commercial processes on almost every gold plant built since 1980 (Fleming, 1992; Van Deventer, 1984).
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 ...
The next process involves electrowinning, which uses electrolysis to separate the cyanide (remaining in solution) and gold (sediment at bottom) ( 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.
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