Van Der Merwe Fundamentals Of Elution Of Gold Cyanide

  • The role of cyanide in the multi-component elution of ...

    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).

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  • (PDF) Process flow-sheet for gold and antimony recovery ...

    innovative thiourea gold leaching process, Hydrometallurgy w17x J.S.J. Van Deventer, P.F. Van Der Merwe, Factors affecting 48 Ž1998. 113–124. the elution of gold cyanide from activated carbon, Minerals w29x O. Levenspiel, Chemical Reaction …

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  • van der merwe fundamentals of elution of gold cyanide

    Ultrasonic elution of gold from activated carbon Feng et al. / Minerals Engineering 16 (2003) 257–264 259 (Van der Merwe and Van Deventer Conclusions The feasib

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  • Separation Science and Technology: Vol 30, No 6

    Kinetic Model for the Decomposition of Cyanide during the Elution of Gold from Activated Carbon. J. S. J. Van Deventer & P. F. Van Der Merwe. Pages: 883-898. Published online: 23 Sep 2006. Abstract | References | PDF (612 KB) | Permissions ...

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  • Mintek AR 2011-sml

    21 Gold Industry Water and waste management ... resin adsorption, elution, electrowinning. Leach optimisation and heap leach/ bio-leaching amenability. Cyanide speciation monitoring, and control, cyanide destruction. ... Jacques van der Merwe Maja Inc. Mr Mohau Mphomela, Mintek Chairman of the Board.

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

    Sep 23, 2006· 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.

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  • Елюювання золота — Вікіпедія

    The elution of gold from activated carbon using deionized water // Journal of the South African Institute of Mining and Metallurgy. — 1997. ... — ISSN 0038-223X. (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.

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  • Discussion on the kinetics of the elution of gold from ...

    Elution model For the sake of clarity the elution model proposed by Adams and Nicol (1986) and Adams (1990) is given. It was proposed that the rate of elution could be described by the rates of mass transfer of gold di-cyanide in the outer layer of the carbon particle and in the solution film surrounding the particle. The rate

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

    Feb 01, 1994· Van der Merwe [5] observed a similar trend for the adsorption of gold on activated carbon, where strong pre-treatment conditions prior to elution will lower adsorptivity and hence increase the diffusivity of gold. ... Van der Merwe, P.F., Fundamentals of the elution of gold cyanide from activated carbon, Ph.D. Thesis, University of Stellenbosch ...

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  • Factors affecting the elution of gold cyanide from ... - CORE

    By van Deventer J.S.J. and van der Merwe P.F. Abstract 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 …

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  • (PDF) The mechanism of adsorption of aurocyanide onto ...

    Van Deventer and Van der Merwe ... but it was still found that it is the cyanide anion in the pre-treatment step that enhances the elution of gold, and not the cyanide …

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  • Metallurgical and Materials Transactions B | Volume 25 ...

    An electrochemical study on the dissolution of gold and copper from gold/copper alloys Authors. Yichang Guan; Kenneth N. Han; Content type: OriginalPaper; Published: 01 December 1994; Pages: 817 - 827; The mechanism of elution of gold cyanide from activated carbon Authors. J. S. J. Van Deventer; P. F. Van Der Merwe; Content type: OriginalPaper ...

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

    The elution of the gold cyanide was found to be diffusion controlled only under conditions of weak desorption.

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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 …

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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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  • 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.

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  • Elution and Carbon Reactivation - Resource book

    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).

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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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  • Fundamentals of the elution of gold cyanide from ... - CORE

    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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  • 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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  • (PDF) Recovery of Pt, Pd and Au from a cyanide solution ...

    Van Der Merwe and Van Deventer, 1988, Cho et al. ... Electro winning of gold cyanide is, however, ... Chemistry of adsorption and elution of gold on activated carbon, Recent developments in .

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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. Assistance with ICMI gap or full certification audits.

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  • DESORPTION OF GOLD AND SILVER FROM ACTIVATED CARBON ...

    Using such condition, the experiment was conducted for 10-hour contact time and yielded the highest desorption percentages for gold and silver, namely 80.10 and 70.73% respectively. The derived contents of gold and silver were 295.16 and 159.38 ppm while their achieved weights were 56.080 and 30.601 µ g.

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  • Factors affecting the elution of gold cyanide from ...

    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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  • 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.

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  • The mechanism of elution of gold cyanide from activated ...

    The dynamics of removal of these cations determine the horizontal position of the gold peak in an elution profile. When the concentration of cations in the eluant is high and no cyanide is present in the solution or on the carbon, very little desorption of gold is observed.

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  • The reversibility of adsorption of gold cyanide on ...

    Much controversy exists about the mechanism by which gold cyanide adsorbs on activated carbon. It is not the purpose of this article to explain the exact adsorption mechanism but, rather, to investigate the factors affecting the reversibility of adsorbed gold cyanide. Whereas Au(CN) 2 − is soluble in water, AuCN and Au require the addition of cyanide to form Au(CN) 2 − .

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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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  • Interference of Metals with the Determination of Free Cyanide

    The presence of zinc in solutions leads to an overestimation of free cyanide due to the low stability of zinc-cyanide complexes compared with silver-cyanide Koc et al., 2014; Van der Van der Merwe ...

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