Mechanisms of loading of metal cyanides by weak-base resins

Green, B.R.

doi:10.1016/0167-6989(88)90244-9

Cited by 5 publications

(2 citation statements)

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“…Although RIP technology has been used throughout the world for many years in the processing of uranium ore, it has been applied only recently in pilot-plant tests on gold plants. During the last decade, much progress has been made on RIP technology in the Soviet .Union, South Africa, Canada, the USA and Australia (Fleming and Cromberge, 1984a;Riveros and cooper, 1984;Green et al, 1986;Lakshmanan and Ritcey, 1986;Green, 1988;Hodgkin and Eibl, 1988).…”

Section: Introductionmentioning

confidence: 96%

Inhibition of Mass Transfer to Porous Adsorbents by Fine Particles and Organics

Petersen

Deventer

1991

Chemical Engineering Communications

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Activated carbon and ion-exchange resins are used industrially for the extraction of metal cyanides from slurries. This paper attempts to quantify the inhibition of mass transfer to these adsorbents owing to fouling by fine particles and organics usually present in leached pulps. In this study, resins and carbon were contacted with either solutions of organics, o r dilute slurries of synthetic silica or alumina in batch stirred tanks. Silver cyanide was used as an adsorbate to detect changes in the mass transfer characteristics of the adsorbents, which were ashed to determine the loading of silica or alumina. The rate of intrusion of fine particles into the adsorbent matrix was relatively fast, and was dependent on the concentration of particles in the slurry. SEM mappings of Si and Al showed that the intruded particles were distributed fairly homogeneously throughout the adsorbent particles. It was found that the presence of fine inert particles and organics had no effect on the equilibrium loading of silver cyanide on either the resin o r carbon. The reduction in the rate of adsorption appeared to be a kinetic influence, and could be attributed to two effects, viz.: (1) pore blocking, and therefore retarded diffusion into the resin bead o r carbon granule, and (2) temporary blinding of the resin o r carbon surface. By fitting a film transport-surface diffusion model to the profiles for the uptake of silver cyanide, it was found that a decrease in the intraparticle diffusivity was associated with pore blocking.

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Section: Introductionmentioning

confidence: 96%

Inhibition of Mass Transfer to Porous Adsorbents by Fine Particles and Organics

Petersen

Deventer

1991

Chemical Engineering Communications

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“…Evidence for the association of HAu(CN) 2 in alcohols and ketones has also been put forward (3). An ion-pair species has also been invoked in the extraction of aurocyanide by polymeric adsorbents (4)(5)(6), ion-exchange resins (7), and activated carbon (8)(9)(10)(11). Activated carbon is currently used in the preferred process for the selective extraction of gold and silver from cyanided ores (the carbon-in-pulp process), and ion-exchange resins have been shown to be superior under cer-…”

Section: Introductionmentioning

confidence: 99%

Extraction of MAu(CN)₂Ion Pairs into Organic Solvents from Aqueous Solution

Adams¹

1999

Separation Science and Technology

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Factors influencing the extraction and association of MAu(CN) 2 ion pairs in organic solvents are elucidated. For extraction of aurocyanide ion pairs with small cations (H ϩ , Li ϩ , Na ϩ , K ϩ ), the most important factor is the solubility of water in the solvent. High extraction efficiencies are related to low association constants for these cations. For extraction of aurocyanide ion pairs with larger, less hydrated cations (Cs ϩ , NEt 4 ϩ ), other solvent-specific parameters, such as dielectric constant and hydrogen-bonding ability, play a role.

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