van der merwe fundamentals of elution of gold cyanide

van der merwe fundamentals of elution of gold cyanide

Fundamentals of the elution of gold cyanide from activated ...

Van der Merwe, Pieter F.(Pieter Francois) dc.contributor.other: ... The elution of the gold cyanide was found to be diffusion controlled only under conditions of weak desorption. Under these conditions, the desorption of the gold cyanide was simulated with a model accounting for mass transfer between the micropores and the macropores of the ...

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Fundamentals of the elution of gold cyanide from activated ...

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

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Dynamic modelling of competitive elution of activated ...

Dec 01, 1995  MODELLING OF GOLD CYANIDE ELUTION In this section the equilibrium and dynamics of the elution of gold cyanide will be summarised; more details are provided elsewhere [2,15,16]. ... Van der Merwe, P.F., Fundamentals of the elution of gold cyanide from activated carbon, Ph.D. Thesis, University of Stellenbosch, South Africa, 453 (1991). Van ...

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Modelling of the AARL elution process - ScienceDirect

May 01, 1994  Van der Merwe, P.J., Fundamentals of the Elution of Gold cyanide from activated carbon, PhD Thesis, University of Stellenbosch, (June 1991). Sheindorf, C.H. Rebhum N., A Freundlich-Type Multi-component Isotherm, Journal of Colloid

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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.

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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.

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Effect of temperature, contact time, and agitation speed ...

the elution of gold, and not the cyanide anion that is carried over to the eluant. Van Deventer and Van der Merwe (1994, 1992) therefore came to a conclusion similar to that of Adams and Fleming ...

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THE ADSORPTION AND ELUTION OF PLATINUM GROUP

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).

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The fundamentals of unit operations in CIP plants: A ...

During the past fifteen years significant progress has been made on carbon-in-pulp (CIP) technology for the extraction of gold. While most research on the mechanisms and kinetics of CIP sub-processes has focused on the adsorption step only, auxiliary unit operations such as elution, acid washing and the thermal regeneration of spent carbon have received less attention.

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(PDF) Removal of cyanide from water and wastewater using ...

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

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The effect of temperature on the desorption of gold ...

van Deventer J.S.J.; van der Merwe P.F. (1993) Article. Activated carbon is used worldwide for the extraction of gold cyanide from leached pulps. 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. ...

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The fundamentals of unit operations in CIP plants: A ...

During the past fifteen years significant progress has been made on carbon-in-pulp (CIP) technology for the extraction of gold. While most research on the mechanisms and kinetics of CIP sub-processes has focused on the adsorption step only, auxiliary unit operations such as elution, acid washing and the thermal regeneration of spent carbon have received less attention.

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Kinetic Model for the Decomposition of Cyanide during the ...

Sep 23, 2006  (1995). Kinetic Model for the Decomposition of Cyanide during the Elution of Gold from Activated Carbon. Separation Science and Technology: Vol. 30, No. 6, pp. 883-898.

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THE ADSORPTION AND ELUTION OF PLATINUM GROUP

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).

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ZADRA Elution Circuit Optimisation and Operational ...

Van Deventer and Van der Merwe, 1995; Wan et al., 1993; Yalcin and Arol, 2002). The adsorption of ... elution of gold cyanide from activated carbon are the ZADRA and AARL procedure. In the ZADRA

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DESORPTION OF GOLD AND SILVER FROM ACTIVATED CARBON ...

van Deventer, J. S. J. and van der Merwe, P. F. (1994) “Factors affecting the elution of gold cyanide from activated carbon,” Minerals Engineering, 7(1), pp. 71–86. doi: 10.1016/0892-6875(94)90148-1. Elnathan, F. (2007) The effect of activated carbon particle size on gold cyanide adsorption and elution. University of Utah.

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Modeling of gold elution from activated carbon using a ...

Nov 01, 1997  A plug-flow model is described for the reactor mass balance of a typical AARL gold elution process. The model is in the form of a hyperbolic differential equation and was transformed using the method of characteristics. The transformed model was then solved simultaneously with models dependent on intraparticle surface diffusion and film transfer parameters.

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Anomalous radiochemical recovery of post-detonation gold ...

Sep 19, 2014  Van Deventer JSJ, Van der Merwe PF (1994) The mechanism of elution of gold cyanide from activated carbon. Metall Mater Trans B 25:829–838. Article Google Scholar 13. Gunnink R, Niday JB (1971–1972) Computerized quantitative analysis by gamma-ray spectrometry. UCRL-51061, 5 volumes, Livermore National Laboratory, Livermore

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The fundamentals of unit operations in CIP plants: A ...

By van Deventer J.S.J., Lorenzen L., van der Merwe P.F., Morrison D.W. and van der ... An equilibrium model can be used for the elution of gold activated carbon in which the equilibrium isotherm shifts as cyanide and spectator cations are removed, and the surface of the carbon is reactivated by removal of the cyanide degradation products during ...

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contents

Gold • Evaluation and design of recovery circuits, carbon and resin adsorption, elution, electrowinning. Leach optimisation and heap leach bio-leaching amenability. • Cyanide speciation monitoring, online cyanide measurement and control, cyanide destruction.

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RANDOL GOLD SILVER FORUM '98 - GBV

H.W. Gussmann and E. van der Merwe, Chemeffco - JCI Ltd and R.G. Rohrs, Robertson Technologies Corp. The Use of Ion Exchanger for the Removal of Calcium, Sulphate and Metals from Acid Mine Waters and Other Effluents 157 Batric Pesic and Victor C. Storhok, University of Idaho, College of Mines-McCIure Hall; David C. Sanders,

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RECENT ADVANCES lN THE EXTRACTION, PROCESSING AND ...

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

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(PDF) A novel energy efficient process for the extraction ...

Evaluation of the Merrill–Crowe process for the simultaneous removal of platinum, palladium and gold from cyanide leach solutions By G. Akdogan and Cleophace Ngoie Mpinga The application of activated carbon for the adsorption and elution of platinum group metals from dilute cyanide leach solutions

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SciELO - Brasil - Dynamic simulation of the carbon-in-pulp ...

The adsorption of gold cyanide onto activated carbon. II: Applications of the kinetic model to multistage absorption circuits, Journal of the South African Institute of Mining and Metallurgy, 84, 50-54. ... L., van der Merwe, P.F., Morrison D.W., and van der Westhuysen, J.P.W. (1994). The fundamentals of unit operations in CIP plants: A ...

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optimal conditions for gold elution plant

van der merwe fundamentals of elution of gold cyanide 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 ...

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Factors Affecting The Elution of PT, PD and Au Cyanide ...

The increase in the gold elution is due to the higher loading, but which did not reach an equilibrium stage and which corre-Fig. 8 shows the elution curve from a higher PGM loaded acti- sponds to the findings by Boshoff (1994), Van der Merwe vated carbon compared to the elution of a lower loaded activated (1991) and Davidson and Duncanson (1977).

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Igor Santander Adsorption Cyanide

fundamentals of the elution.of gold cyanide from activated carbon. pieter f. van der merwe. dissertation presented for the degree of doctor of philosophy. in engi.neering at the university of stellenbosch. supervisor : prof. j.s.j. van deventer. june 1991 stellenbosch university https://scholar.sun.ac j

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DESORPTION OF GOLD AND SILVER FROM ACTIVATED

Experiments of gold and silver elution were conducted using several parameters, either fixed or varying ... (van sDeventer and van der Merwe, 1994). Experiments for goldsilver - ... size of activated carbons with gold cyanide for subsequent elution experiments as set-up in Figure 1. Coarse granular activated

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The fundamentals of unit operations in CIP plants: A ...

By van Deventer J.S.J., Lorenzen L., van der Merwe P.F., Morrison D.W. and van der Westhuysen J.P.W. Abstract. ... An equilibrium model can be used for the elution of gold activated carbon in which the equilibrium isotherm shifts as cyanide and spectator cations are removed, and the surface of the carbon is reactivated by removal of the cyanide ...

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Anomalous radiochemical recovery of post-detonation gold ...

Sep 19, 2014  Van Deventer JSJ, Van der Merwe PF (1994) The mechanism of elution of gold cyanide from activated carbon. Metall Mater Trans B 25:829–838. Article Google Scholar 13. Gunnink R, Niday JB (1971–1972) Computerized quantitative analysis by gamma-ray spectrometry. UCRL-51061, 5 volumes, Livermore National Laboratory, Livermore

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Day 52, Methods to recover Gold II Rio Suerte

(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.

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The fundamentals of unit operations in CIP plants: A ...

By van Deventer J.S.J., Lorenzen L., van der Merwe P.F., Morrison D.W. and van der ... An equilibrium model can be used for the elution of gold activated carbon in which the equilibrium isotherm shifts as cyanide and spectator cations are removed, and the surface of the carbon is reactivated by removal of the cyanide degradation products during ...

More

RECENT ADVANCES lN THE EXTRACTION, PROCESSING AND ...

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

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(PDF) A novel energy efficient process for the extraction ...

Evaluation of the Merrill–Crowe process for the simultaneous removal of platinum, palladium and gold from cyanide leach solutions By G. Akdogan and Cleophace Ngoie Mpinga The application of activated carbon for the adsorption and elution of platinum group metals from dilute cyanide leach solutions

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US6200364B1 - Process for eluting precious metals from ...

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.

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An Environmentally Sound Gold Recovery Process For Small ...

(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 70-75% gold and 10-15% silver, the remaindPf being copper and steel wool.

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igor santander Adsorption Cyanide

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Inside Mining October 2015 by 3S Media - Issuu

Inside Mining October 2015 by 3S Media - issuu. ISSN 1999-8872 • R50.00 (incl. VAT) • Vol. 9 • No. 10 • October 2015. miningne.ws. AF R IC AN U PDATES ON TH E. MINERALS PROCESSING ...

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