The chemistry of gold solvent extraction from cyanide solution using modified amines

Mooiman, Michael B.; Miller, Jan D.

doi:10.1016/0304-386x(86)90001-0

Cited by 83 publications

(23 citation statements)

References 8 publications

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“…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%

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: 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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“…The use of mixtures of the amine with solvation reagents had been study, since these mixtures seem to be attractive for the extraction of gold (I) from alkaline solutions [2,10]. This study was carried out shaking equal volumes of organic phases of amine Amberlite LA2 (0.12 M) plus Cyanex 921 (0.13 M) or TBP (0.18 M) in kerosene and aqueous phases of gold (I) cyanide, 0.1 mmol/l gold.…”

Section: Extractionmentioning

confidence: 99%

“…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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“…nopoulos, 1991;Marsden and House, 1992 . Solvent extraction had no known practical application in this field; although during last few years there has been a renewed interest in the application of this technique to the recovery of precious metals from such alkaline solutions using various ex-Ž tractants Mooiman and Miller, 1984, 1986, 1991Alguacil et . al., 1994;Alguacil and Caravaca, 1996;Alguacil et al, 1997 . On the other hand, solvent extraction has been applied industrially for the separation in chloride media of gold, platinum group metals, and base metals during precious metal Ž .…”

Section: Introductionmentioning

confidence: 99%

Modeling Au(CN) extraction by mixtures of primene JMT and cyanex 925 reagents

Alguacil

1999

AIChE Journal

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The chemistry of gold solvent extraction from cyanide solution using modified amines

Cited by 83 publications

References 8 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

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

Modeling Au(CN) extraction by mixtures of primene JMT and cyanex 925 reagents

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