The chemistry of gold solvent extraction from alkaline cyanide solution by solvating extractants

Mooiman, Michael B.; Miller, Jan D.

doi:10.1016/0304-386x(91)90076-x

Cited by 55 publications

(14 citation statements)

References 10 publications

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“…As the bubbling proceeds, Au(III) also accumulates in the foamate phase with the final recovery as high as 86 %, implying the strong interaction between the metal and the surfactant. Since Au(III) exists in the form of AuCl 4 -in hydrochloric acid, the adsorption should take place through the coordination of the surfactant EO unit to the chloroauric acid, HAuCl 4 , akin to the case of solvent extraction with solvating extractants. Thus, the surfactant successfully plays a double role of foam-producer and collector, and the separation of Au(III) can be attained with this simple technique.…”

Section: Foam Separation Of Au(iii) From Hydrochloric Acid Mediamentioning

confidence: 99%

“…Ion pair extractants such as amine salts are utilized to extract this anionic species [2,3], while solvating extractants including methyl isobutyl ketone [4] and dibutylcarbitol (diethyleneglycol dibutyl ether) [1] are adopted in the extraction of its parent acid, tetrachloroauric acid (HAuCl 4 ). Among other extractants examined are di(2-ethylhexyl) phosphoric acid, guanidine-based compound and alkyliminodimethylene phosphonic acid [3][4][5]. 72 T. Kinoshita, S. Akita, S. Ozawa, S. Nii, F. Kawaizumi, and K. Takahashi Vol.…”

Section: Introductionmentioning

confidence: 99%

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A Study on Gold(III) Recovery Via Foam Separation with Nonionic Surfactant in Batch Mode

Kinoshita¹,

Akita²,

Ozawa³

et al. 2003

JMMCE

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Foam separation of Au(III) from its hydrochloric acid solutions was studied in a batch mode using a nonionic surfactant: polyoxyethylene nonyl phenyl ether having 20 ethylene oxide units (PONPE20). The surfactant showed a strong affinity to Au(III) in HCl media and played a double role of foam-producer and metal-collector. Effects of experimental parameters, such as the length of drainage section of the column, concentration of the surfactant and the metal, air flow rate and solution temperature, were discussed in terms of the recovery and the enrichment of Au(III). The recovery increased with an increase in the concentration of surfactant and in air flow rate, while the enrichment improved with decreasing air flow rate and increasing the length of drainage section. The behavior of Au(III) adsorption onto the foam was also analyzed in terms of the surface excess, and the Freundlich's adsorption isotherm was successfully applied to the system. Moreover, the selective separation of Au(III) from several heavy metals and the application of cloud point extraction to the present foamate solution were also carried out with the resultant enrichment ratio of 59.

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Section: Foam Separation Of Au(iii) From Hydrochloric Acid Mediamentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A Study on Gold(III) Recovery Via Foam Separation with Nonionic Surfactant in Batch Mode

Kinoshita¹,

Akita²,

Ozawa³

et al. 2003

JMMCE

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“…As a result, studies on the direct solvent extraction of gold(I) from cyanide solution have received much attention. 1,2 Early studies on the solvent extraction of gold mainly involved the extraction of gold(III) in aqueous acid solution. 3 In 1984, Miller and Mooiman 4 reported that Au(CN) − 2 could be extracted directly from alkaline cyanide solution by amines and modified amines; furthermore, the pH 50 of extraction could be enhanced by adding tri-n-butylphosphate (TBP), dibutylphosphine oxide (DBPO) or other phosphorus-oxygen compounds to the organic phase.…”

Section: Introductionmentioning

confidence: 99%

Solvent extraction of gold(I) from alkaline cyanide solution by dibutylcarbitol (DBC) with n‐octanol

Pan

2008

J of Chemical Tech & Biotech

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BACKGROUND: Currently, cyanidisation is preferred for the extraction of gold because it has a number of advantages over other methods. Gold(I) can be extracted with various extractants, but there are no reports on the extraction of gold(I) from cyanide solution by dibutylcarbitol (DBC). In this work the extraction of gold(I) from alkaline cyanide solution using DBC with n-octanol was studied. Several factors affecting the percentage extraction of gold(I), including DBC concentration, diluent concentration, equilibrium time, phase ratio, pH and gold concentration in aqueous phase, were investigated.

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“…The concentration of the gold-bearing solutions is normally carried out by carbon adsorption or ion exchange [1]. Liquid-liquid extraction had no known practical application in this field, though in the latter years there has been a renewed interest in the application of this technique to the recovery of this precious metal from such alkaline solutions using various extractants [2][3][4][5]. These extraction systems can also be implemented in solid supported liquid membranes where the performance of the separation operation is enhanced by a combination of the extraction and stripping processes in one step.…”

Section: Introductionmentioning

confidence: 99%

Liquid-liquid extraction of Au(I) by Amberlite LA2 and its application to a polymer-immobilized liquid membrane system

Alonso

2005

Gold Bull

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The liquid-liquid extraction of Au(I) by Amberlite LA2 (secondary amine) in kerosene from cyanide media has been investigated. The analysis of metal distribution data suggested the formation of R 2 NH 2 + Au(CN) 2 -species in the organic phase with formation constant log K ext = 6.5 ± 0.03, whereas the use of mixtures of the amine with a solvation extractant (e.g. a phosphine oxide) shifted the gold-pH 1/2 extraction towards more alkaline values. The results obtained on Au(I) distribution have been implemented in a polymerimmobilized liquid membrane system, using NaOH solutions (e.g. 0.01 mol/L) to strip the metal from the organic phase.

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The chemistry of gold solvent extraction from alkaline cyanide solution by solvating extractants

Cited by 55 publications

References 10 publications

A Study on Gold(III) Recovery Via Foam Separation with Nonionic Surfactant in Batch Mode

A Study on Gold(III) Recovery Via Foam Separation with Nonionic Surfactant in Batch Mode

Solvent extraction of gold(I) from alkaline cyanide solution by dibutylcarbitol (DBC) with n‐octanol

Liquid-liquid extraction of Au(I) by Amberlite LA2 and its application to a polymer-immobilized liquid membrane system

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