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Identification of Solvent Extraction of Au(III) by Cyanex 272 from Hydrochloric Acid Solutions
Thi Nhan Hau Nguyen, Man Seung Lee
Korean J. Met. Mater. 2024;62(3):204-211.   Published online 2024 Feb 28
DOI: https://doi.org/10.3365/KJMM.2024.62.3.204

Bis(2,4,4-trimethylpentyl)phosphinic acid (Cyanex 272) is known to selectively extract Au(III) from dilute to concentrated hydrochloric acid solutions. Therefore, Cyanex 272 can be employed in the separation of Au(III) from the hydrochloric acid leaching solutions of secondary resources containing gold metal. This work identified the extraction reaction of Au(III) by Cyanex..... More

Effects of Thiourea Stripping of 14 Karat White Gold Alloys With the Addition of SDS Surfactant
SDS 계면활성제 첨가에 따른 14 캐럿 백색 금합금의 티오우레아 스트리핑의 효과
Ikgyu Kim, Kwangbae Kim, Ohsung Song
김익규, 김광배, 송오성
Korean J. Met. Mater. 2020;58(7):447-452.   Published online 2020 Jul 5
DOI: https://doi.org/10.3365/KJMM.2020.58.7.447

A stripping solution with thiourea, iron(III) sulfate, and sodium dodecyl sulfate(SDS) was employed to strip Ni-based 14 karat white gold alloys, and the formation of the NiS byproduct and elimination of passivation were investigated in the presence of 0.0-0.2 g/L SDS. White gold alloy samples with a flat shape were..... More

                   Web of Science 1  Crossref 1
Separation and Recovery of Precious Metals from Leach Liquors of Spent Electronic Wastes by Solvent Extraction
Thi Hong Nguyen, Lingyun Wang, Man Seung Lee
Korean J. Met. Mater. 2017;55(4):247-255.   Published online 2017 Apr 6
DOI: https://doi.org/10.3365/KJMM.2017.55.4.247

Solvent extraction was employed to recover precious metals (Au (III), Pd (II) and Pt (IV)) from the leach solution of spent electronic wastes containing Cu (II), Cr (III) and Fe (III). First, pure Fe (III) and Au (III) were recovered by simultaneous extraction with Cyanex 923 followed by selective stripping..... More

       Crossref 16
Corrosion & Surface Treatment
Effect of Potassium Persulfate on Current Efficiency for Gold Plating
금도금의 전류효율에 미치는 과황산칼륨 첨가의 영향
Injoon Son, Ho-Sang Sohn, Kyung Tae Kim
손인준, 손호상, 김경태
Korean J. Met. Mater. 2016;54(9):652-658.   Published online 2016 Sep 5
DOI: https://doi.org/10.3365/KJMM.2016.54.9.652

In this study, the effect of potassium persulfate on current efficiency for gold plating was investigated using electrochemical techniques. The current efficiency in the low-current-density range greatly decreased when potassium persulfate was added to the gold plating solution. However, the current efficiency in the high-current-density range did not change with..... More

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