A Comprehensive Research of Extraction Solvents That Satisfy both Au(III) Extractability and Requirements of Properties for Industrial Operation

Ion solvation extraction has been used as a separation techniques for gold (Au(III)) from various metal ions in a hydrochloric acid media. Dibutyl carbitol (DBC) has been used as the most popular solvent to extract Au(III), while no better solvent has been found for many years. In the present review...

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Published inResources processing Vol. 70; no. 1; pp. 18 - 24
Main Author OSHIMA, Tatsuya
Format Journal Article
LanguageEnglish
Japanese
Published Kyoto Japan Science and Technology Agency 2023
Subjects
Carbitol
Ethers
Flash point
Gold
Hydrochloric acid
Ketones
Metal ions
Octanol
Octanol-water partition coefficients
Polarity
Separation techniques
Solubility
Solubility parameters
Solvation
Solvents
Online AccessGet full text
ISSN1348-6012
1349-9262
1349-9262
DOI10.4144/rpsj.70.18

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Abstract Ion solvation extraction has been used as a separation techniques for gold (Au(III)) from various metal ions in a hydrochloric acid media. Dibutyl carbitol (DBC) has been used as the most popular solvent to extract Au(III), while no better solvent has been found for many years. In the present review, the results of recent investigations by the authors to find valid solvents for ion solvation extraction are summarized. Ethers and ketones are suitable in view of the high extractability for Au(III) as well as the good properties including chemical stability. Ethers and ketones which have a smaller side chains and relatively higher polarity showed higher extractability, however, polar solvents would leak into the aqueous phase. Therefore suitable solvents with moderate polarity are narrowed down based on the balance between high extractability and low aqueous solubility. As the polarity affects the extractability, the logP value (octanol/water partition coefficient) and the Hansen solubility parameter would be one of the indexes for the Au(III) extractability. Solvents used in industrial processes are required to have not only high extractability but also good properties such as a low aqueous solubility and a high flash point. The comprehensive research revealed the requirements for solvents to extract Au(III) based on ion solvation. Additionally, several potential solvents which might replace DBC were suggested.
AbstractList Ion solvation extraction has been used as a separation techniques for gold (Au(III)) from various metal ions in a hydrochloric acid media. Dibutyl carbitol (DBC) has been used as the most popular solvent to extract Au(III), while no better solvent has been found for many years. In the present review, the results of recent investigations by the authors to find valid solvents for ion solvation extraction are summarized. Ethers and ketones are suitable in view of the high extractability for Au(III) as well as the good properties including chemical stability. Ethers and ketones which have a smaller side chains and relatively higher polarity showed higher extractability, however, polar solvents would leak into the aqueous phase. Therefore suitable solvents with moderate polarity are narrowed down based on the balance between high extractability and low aqueous solubility. As the polarity affects the extractability, the logP value (octanol/water partition coefficient) and the Hansen solubility parameter would be one of the indexes for the Au(III) extractability. Solvents used in industrial processes are required to have not only high extractability but also good properties such as a low aqueous solubility and a high flash point. The comprehensive research revealed the requirements for solvents to extract Au(III) based on ion solvation. Additionally, several potential solvents which might replace DBC were suggested.
Author OSHIMA, Tatsuya
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10.1021/ci00020a009
10.1016/j.minpro.2010.10.002
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10.1016/j.hydromet.2018.04.014
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10.1002/aic.17214
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10.1080/07366299.2021.1874108
10.15261/serdj.26.81
10.1016/j.hydromet.2012.11.007
10.1201/9780203021460
10.1016/j.seppur.2020.118008
10.2473/journalofmmij.134.74
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SubjectTerms Carbitol
Ethers
Flash point
Gold
Hydrochloric acid
Ketones
Metal ions
Octanol
Octanol-water partition coefficients
Polarity
Separation techniques
Solubility
Solubility parameters
Solvation
Solvents
Title A Comprehensive Research of Extraction Solvents That Satisfy both Au(III) Extractability and Requirements of Properties for Industrial Operation
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