Solvent Extraction and Stripping of Gold(III) from Hydrochloric Acid Solution Using Vacuum Pump Oil

Xiong, Ying; Kawakita, Hidetaka; Inoue, Jun‐ichi; Abe, Minoru; Ohto, Keisuke; Inoue, Katsutoshi; Harada, Hiroyuki

doi:10.15261/serdj.17.151

Cited by 10 publications

(12 citation statements)

References 13 publications

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“…Xiong et al reported on the extraction isotherm for Au(III) in 3 M HCl using DBC [10]. The maximum ).…”

Section: Selectivity Of Metal Extraction Using Cpme In Hydrochloric Amentioning

confidence: 99%

“…In the extraction system using DBC, extracted gold is reductively stripped as metallic gold using an aqueous oxalic acid solution [10,14]. Rreductive stripping using oxalic acid was not investigated for CPME in this study.…”

Section: Back Extraction Of Au(iii)mentioning

confidence: 99%

“…Oxygen-containing compounds such as methyl isobutyl ketone (MIBK) and amide compounds are found to act as extractants for Au (III) in hydrochloric acid solution [6][7][8][9][10]. Au(III) can also be extracted using O Figure 1.…”

Section: Introductionmentioning

confidence: 99%

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Extraction of Gold(III) Using Cyclopentyl Methyl Ether in Hydrochloric Acid Media

Oshima

Ohkubo

Fujiwara

et al. 2017

SERDJ

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Recently, cyclopentyl methyl ether (CPME) has found use as a commercially available solvent for various applications. As CPME shows better properties such as more hydrophobicity, less solublity in water, less volatility, and more stablity compared with typical ethereal solvents, it could be used as a diluent or an extractant in liquid-liquid extraction systems. In the present study, CPME was found to be useful for the extraction of Au(III) in hydrochloric acid media. Extraction of Au(III) increased with as increase in the hydrochloric acid concentration. Au(III) was selectively extracted using CPME from other precious metal ions and base metal ions. From the result of the dependency of the Au(III) concentration, CPME can load at least 0.93 g/dm 3 Au(III). Extracted Au(III) was quantitatively stripped from CPME using 0.1 M aqueous thiourea solution. As the solubility of water into CPME is much smaller than that into alcohols such as 1-hexanol, CPME is more favorable as an extractant for Au(III) in hydrochloric acid media.

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“…Xiong et al reported on the extraction isotherm for Au(III) in 3 M HCl using DBC [10]. The maximum ).…”

Section: Selectivity Of Metal Extraction Using Cpme In Hydrochloric Amentioning

confidence: 99%

Section: Back Extraction Of Au(iii)mentioning

confidence: 99%

See 1 more Smart Citation

Extraction of Gold(III) Using Cyclopentyl Methyl Ether in Hydrochloric Acid Media

Oshima

Ohkubo

Fujiwara

et al. 2017

SERDJ

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show abstract

“…Under acidic conditions, thiourea is easily protonated by hydrogen ion, and the stability of thiourea protonated at the S atom is stronger than that at the N atom 33 . Therefore, adding dilute hydrochloric acid can increase stripping efficiency of thiourea 34 . Some more stripping experiments were done by employing the mixture of thiourea with either HCl and H 2 SO 4 solution.…”

Section: Resultsmentioning

confidence: 99%

Solvent extraction separation of Au(III) from Pd(II), Cu(II), Ni(II) in HCl solution using cationic, neutral and basic extractants

Nguyen,

Song,

Lee

2023

J of Chemical Tech & Biotech

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BackgroundEtching solutions of spent printed circuit boards (PCBs) contain precious metal ions like Au(III) and Pd(II) together with Cu(II). Therefore, it is crucial to recover Au(III) and Pd(II) from these solutions. To investigate the possibility of separating Au(III) from the etching solutions, solvent extraction experiments were conducted using synthetic hydrochloric acid solutions containing Au(III), Pd(II), Cu(II), and Ni(II). The solvent extraction behavior of these four metal ions was investigated by using cationic (Cyanex 301, LIX 63), neutral (Cyanex 923 and TBP), and basic (Alamine 336 and Aliquat 336) extractants in the HCl concentration range from 1 to 9 M.ResultsTBP and Cyanex 923 were successful in separating Au(III) from other metal ions when the HCl concentration was higher than 7 M. When the concentrations of Au(III) and Pd(II) changed from 0.1 to 5 g/L, TBP was able to selectively extract Au(III) from 7 M HCl solution, while Cyanex 923 was effective in separating Au(III) from 9 M HCl solution. However, Au(III) and Pd(II) were co‐extracted by Alamine 336 and Aliquat 336 from 1 M HCl solution. Thiourea or a mixture of thiourea and HCl solution effectively stripped Au(III) from the loaded organic phases of TBP, Cyanex 923, and amines.ConclusionsAmong the six kinds of the extractants employed in this work, TBP was recommended as an extractant for the selective extraction of Au(III) from the HCl solutions containing Cu(II), Ni(II) and Pd(II) on the basis of high separation degree.This article is protected by copyright. All rights reserved.

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“…SO 4 . Such effective stripping of Au(III) with thiourea is due to the high affinity of thiourea for gold ions: it is known to form a stable cationic complex[22].…”

mentioning

confidence: 99%

Multifunctional Effect of the Polymer Extractant Thiomethylbenzoxazoyl-α-Methylstyrene on the Extraction of Au(III)

Hanada

Iwakuma

Goto

2019

SERDJ

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In this study, we synthesized a polymer extractant and its monomer analogue, and the multifunctional effect was investigated by comparing their extraction behavior for Au(III). To increase the affinity for gold ions, we introduced a sulfur atom into the molecular structure of the extractant as a soft donor. The extraction ability of the new extractants for gold ions was influenced by the HCl concentration in the aqueous feed solution. The multifunctional effect appeared when using the polymer extractant in the liquid-liquid extraction of gold ions. Selectivity of the extractants toward Au(III) was evaluated using a model solution generated from leaching of waste cellphones. Selectivity for Au(III) was found to be enhanced by the multifunctional effect of the polymer extractant.

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Solvent Extraction and Stripping of Gold(III) from Hydrochloric Acid Solution Using Vacuum Pump Oil

Cited by 10 publications

References 13 publications

Extraction of Gold(III) Using Cyclopentyl Methyl Ether in Hydrochloric Acid Media

Extraction of Gold(III) Using Cyclopentyl Methyl Ether in Hydrochloric Acid Media

Solvent extraction separation of Au(III) from Pd(II), Cu(II), Ni(II) in HCl solution using cationic, neutral and basic extractants

Multifunctional Effect of the Polymer Extractant Thiomethylbenzoxazoyl-α-Methylstyrene on the Extraction of Au(III)

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