Processing of high purity gold from scraps using diethylene glycol di-N-butyl ether (dibutyl carbitol)

Jung, Byoung Hi; Park, Yi Yong; An, Jeon Woong; Kim, Seong Jun; Tran, Tam; Kim, Myong Jun

doi:10.1016/j.hydromet.2008.06.006

Cited by 35 publications

(19 citation statements)

References 8 publications

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“…ethereal compounds such as crown ethers [11,12] and dibutyl carbitol (DBC) [13][14][15][16][17][18]. DBC is commercially used as an extractant for Au(III) from hydrochloric acid solution in INCO's operation in Canada [14].…”

Section: Introductionmentioning

confidence: 99%

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

Oshima

Ohkubo

Fujiwara

et al. 2017

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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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Section: Introductionmentioning

confidence: 99%

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

Oshima

Ohkubo

Fujiwara

et al. 2017

SERDJ

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“…For these reasons, some new solvent extraction reagents for gold have been developed as well as new stripping methods [16][17][18]. Narita et al developed two new amide-type reagents: N, N-di-n-octylacetamide (DOAA) and N, N-di-n-octylauramide (DOLA).…”

Section: Introductionmentioning

confidence: 99%

“…Recently, a novel stripping method was reported in which gold was recovered as solid fulminating gold Au 2 O 3 ×3NH 3 , which was formed from the direct reaction between concentrated ammonia and the gold in the DBC. This intermediate product was then further reduced to metallic gold powder by hydrazine [18].…”

Section: Introductionmentioning

confidence: 99%

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

Xiong

Kawakita

Inoue

et al. 2010

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Vacuum pump oil (VPO) in toluene was employed as a solvent extraction reagent for Au(III) from HCl. The effects of shaking time and concentration of HCl on the extraction of Au(III) were investigated. It was found that the selectivity of VPO for Au(III) was superior even to dibutylcarbitol (DBC) which is currently employed as a commercial extactant for gold. The extraction of Au(III) with VPO is nearly quantitative over the whole HCl concentration range, while the extraction of other metal ions is nearly negligible. In addition, in case of the VPO system, the extraction of Au(III) was independent of HCl concentration regardless of the VPO concentration, while in the case of DBC, it is independent of HCl concentration only for 100% DBC. The loading capacity for Au(III) was compared between 10 % VPO in toluene and 100 % DBC. The stripping of Au(III) from the loaded VPO was also investigated using aqueous mixtures of thiourea and hydrazine in combination with varying concentrations of HCl and NaOH. It was found that complete stripping can be achieved by these combinations and that gold is recovered as solid particles in some cases.

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“…This result is not surprising given the ease of extractiono fA u III ;t he industrial solvents used, such as dibutyl carbitol, are only weaklyc oordinating ethers. [23] Palladiume xtraction highlights the strong influence of the spacer:w ith the classicalt wo-unit spacer, extraction performance is on average only 40 %o ft hat of the nonfluorinated malonamide. Al onger spacerl eads to an attenuation of the electron-withdrawinge ffect of the F-ponytail.…”

Section: Resultsmentioning

confidence: 99%

Impact of the Long‐Range Electronic Effect of a Fluorous Ponytail on Metal Coordination during Solvent Extraction

et al. 2017

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With the need for a precise description of the long-range electronic effects of a perfloroalkyl chain (F-ponytail) grafted onto metal chelators, we studied in detail the effect of a spacer inserted between the polar complexing head and the F-ponytail, in relation to the metal coordination ability of the resulting molecules. The prepared molecules were then applied for the extraction of various metals from an aqueous phase into an organic phase, and the optimum spacer length could be estimated to be between three and four methylene units, according to the extraction conditions. The study also revealed the difficulty of modeling and anticipating the tiny energy differences involved in the extraction process and the importance in peculiar cases to go beyond only these studied inductive effects to understand better the factors that govern the stabilization of a metallic cation in a complex fluorous phase.

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Processing of high purity gold from scraps using diethylene glycol di-N-butyl ether (dibutyl carbitol)

Cited by 35 publications

References 8 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 and Stripping of Gold(III) from Hydrochloric Acid Solution Using Vacuum Pump Oil

Impact of the Long‐Range Electronic Effect of a Fluorous Ponytail on Metal Coordination during Solvent Extraction

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