Extraction and recovery of gold from KAu(CN)<sub>2</sub> using cetyltrimethylammonium bromide microemulsions

Tianxi, Zhang; Huang, Bao-gui; Zhou, Wenbin; Gao, Hongcheng; Chen, Jing; Wu, Ha‐Shen; Wu, Jinguang

doi:10.1002/jctb.489

Cited by 18 publications

(4 citation statements)

References 14 publications

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“…The S atom is considered to be a soft Lewis base, whereas Pt(II) is a soft Lewis acid. S atom possibly coordinates with Pt(II) ion, attributed to strong interaction of S with Pt(II) . Hence, S(CH 2 CH 2 OH) 2 can strip Pt as Pt(C 2 H 4 OH) 2 (CN) 4 2‐ into the aqueous phase.…”

Section: Resultsmentioning

confidence: 99%

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Separation and recovery of Pd(II) and Pt(II) from cyanide liquors of Pd-Pt flotation concentrate via solvent extraction

Chen

Huang

et al. 2017

J. Chem. Technol. Biotechnol

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BACKGROUND Thus far, separation and recovery of Pd(CN)42‐ and Pt(CN)42‐ from cyanide liquors have not been reported. In this study, the process of co‐extracting and separating Pd(II) and Pt(II) over Fe(III), Cu(I), Co(III), and Ni(I) from alkaline cyanide liquors was investigated. RESULTS The results showed that almost all Pd(II) and Pt(II) (>98.0%) could be simultaneously extracted by phenoxyethyl dimethyl palmitylammonium bromide (PDPB), whereas Fe(III), Cu(I), Co(III), and Ni(I) was below 3.0% under optimum conditions. Furthermore, Pd(CN)42‐ and Pt(CN)42‐ were separated and recovered by the two‐step stripping process. First, Pd(CN)42‐ in mixed organic phase was stripped by a 2.0 mol L−1 ammonium thiocyanate solution. The stripping percentage of Pd(CN)42‐ was >98%, whereas the stripped Pt(CN)42‐ was below 1%. Second, more than 97.5% Pt(CN)42‐ in the loaded organic phase could be stripped using 1.0 mol L−1 thiodiglycol solution. Recovery ratios for both Pd(II) and Pt(II) were above 95%. The organic phase could be reused for at least 6 cycles of extraction–stripping processes. The mechanisms of extraction reaction were deduced to be ion‐association mechanisms. CONCLUSION The process could be applied for extracting and separating palladium and platinum from the cyanide leaching liquor of the flotation concentrate. © 2016 Society of Chemical Industry

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Section: Resultsmentioning

confidence: 99%

“…S atom possibly coordinates with Pt(II) ion, attributed to strong interaction of S with Pt(II). 41,42 Hence, S(CH 2 CH 2 OH) 2 can strip Pt as Pt(C 2 H 4 OH) 2 (CN) 4 2into the aqueous phase. The stripping reaction using S(CH 2 CH 2 OH) 2 with platinum can be proposed as follows:…”

Section: -mentioning

confidence: 99%

Separation and recovery of Pd(II) and Pt(II) from cyanide liquors of Pd-Pt flotation concentrate via solvent extraction

Chen

Huang

et al. 2017

J. Chem. Technol. Biotechnol

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“…Because of the tunability of cations and anions, quaternary amine salts have been widely used in the extraction and separation of metal cyanide [24,25,26,27]. However, quaternary ammonium extraction agents have several drawbacks such as easily emulsified and unsuitable viscosity.…”

Section: Introductionmentioning

confidence: 99%

Two-Step Elution Recovery of Cyanide Platinum Using Functional Metal Organic Resin

Chen

Jiang

et al. 2019

Molecules

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A novel functional ion-exchange/adsorption metal organic resin (MOR), TEBAC-HKUST-1, was prepared and characterized. Ethanedithiol was used as the grafting agent to introduce thiol groups onto HKUST-1, and 4-vinylbenzyl chloride was then grafted onto SH-HKUST-1 using thiol groups. Finally, the quaternary ammonium functional group was immobilized onto the carrier by performing a quaternization reaction. The structure and property of TEBAC-HKUST-1 MOR were characterized by TGA, N2 adsorption–desorption, FTIR, SEM, and XRD. TEBAC-HKUST-1 MOR was used to remove metal cyanide complexes from wastewater. The adsorption was rapid, and the metal cyanide complexes including Pt(CN)42−, Co(CN)63−, Cu(CN)32−, and Fe(CN)63− were removed in 30 min. TEBAC-HKUST-1 MOR exhibited a high stability in neutral and weak basic aqueous solutions. Furthermore, Pt(II) could be efficiently recovered through two-step elution. The recovery rate of Pt(II) for five cycles were over 92.0% in the mixture solution containing Pt(CN)42−, Co(CN)63−, Cu(CN)32−, and Fe(CN)63−. The kinetic data were best fitted with the pseudo second-order model. Moreover, the isothermal data were best fitted with the Langmuir model. The thermodynamic results show that the adsorption is a spontaneous and exothermic process. TEBAC-HKUST-1 MOR not only exhibited excellent ability for the rapid removal of metal cyanide complexes, but also provided a new idea for the extraction of noble metals from cyanide-contaminated water.

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“…In recent years, some new extraction systems to recover Au(I) directly from the alkaline cyanide leaching solution have been introduced [14][15][16][17][18] . Quaternary ammonium salts have also been used to partition Au(CN) 2 due to their high loading capacity and their broad application pH range.…”

Section: Introductionmentioning

confidence: 99%

Solvent Extraction of Pd(CN)4 2– from Alkaline Cyanide Solution with Dodecyl Trimethylammonium Bromide

Chen¹,

Huang²,

Chen³

et al. 2014

Asian J. Chem.

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The solvent extraction of Pd(CN)4 2from alkaline cyanide solution by using dodecyltrimethylammonium bromide diluted in benzene was investigated. It has been indicated that Pd(CN)4 2extraction percentage increases by increasing dodecyltrimethylammonium bromide concentration. Extraction parameters of Pd(CN)4 2-, including appropriate diluting agent, dodecyltrimethylammonium bromide concentration, contact time of aqueous and organic phases, pH of the aqueous solution and organic/aqueous phase ratio, were studied. Octanol has an obvious synergistic effect on Pd(CN)4 2extraction with dodecyltrimethylammonium bromide. It was indicated that at dodecyltrimethyl ammonium bromide concentration 0.01 mol L -1 , contact time of 10 min, octanol concentration 40 % (v/v), organic/aqueous phase ratio 1, the optimal pH of the aqueous phase11.5, almost all of the Pd(CN)4 2-(> 99 %) was transferred from the aqueous phase into the organic phase. Ammonium thiocyanate solution could be used as stripping agent. Most of the Pd(CN)4 2in the organic phase can be stripped with aqueous solutions of ammonium thiocyanate.

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Extraction and recovery of gold from KAu(CN)₂ using cetyltrimethylammonium bromide microemulsions

Cited by 18 publications

References 14 publications

Separation and recovery of Pd(II) and Pt(II) from cyanide liquors of Pd-Pt flotation concentrate via solvent extraction

Separation and recovery of Pd(II) and Pt(II) from cyanide liquors of Pd-Pt flotation concentrate via solvent extraction

Two-Step Elution Recovery of Cyanide Platinum Using Functional Metal Organic Resin

Solvent Extraction of Pd(CN)4 2– from Alkaline Cyanide Solution with Dodecyl Trimethylammonium Bromide

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Extraction and recovery of gold from KAu(CN)2 using cetyltrimethylammonium bromide microemulsions

Cited by 18 publications

References 14 publications

Separation and recovery of Pd(II) and Pt(II) from cyanide liquors of Pd-Pt flotation concentrate via solvent extraction

Separation and recovery of Pd(II) and Pt(II) from cyanide liquors of Pd-Pt flotation concentrate via solvent extraction

Two-Step Elution Recovery of Cyanide Platinum Using Functional Metal Organic Resin

Solvent Extraction of Pd(CN)4 2– from Alkaline Cyanide Solution with Dodecyl Trimethylammonium Bromide

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Product

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Extraction and recovery of gold from KAu(CN)₂ using cetyltrimethylammonium bromide microemulsions