Extraction of Au(I) from a thiosulfate leach liquor using guanidinium ionic liquid (C8)2dmg+Br− in 20 % (v/v) n-octanol/n-heptane diluent and stripping with aqueous NaCl

IF 4.8 2区材料科学 Q1 METALLURGY & METALLURGICAL ENGINEERING

Hydrometallurgy Pub Date : 2025-02-01 DOI:10.1016/j.hydromet.2024.106432

Lingli Liu , Guiping Zhu , Chen He, Yanjun Chen, Yewei Qiu, Shixiong Wang, Conghai Zhang, Xiangjun Yang

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引用次数: 0

Abstract

In this study, novel guanidinium ionic liquids (GILs) were designed to achieve efficient extraction of Au(I) from thiosulfate solution. A series of process parameters affecting extraction efficiency, including reaction time, phase ratio, different types of guanidinium ionic liquids and their concentrations, as well as different stripping agents, were tested. The results showed that 2,2-dioctyl-1,1,3,3-tetramethylguanidinium bromide (C₈)₂dmg⁺Br⁻) dissolved in 20 % (v/v) n-octanol/n-heptane diluent exhibited excellent extraction performance for Au(I) under optimal extraction conditions. The extraction efficiency of Au(I) in thiosulfate solution was over 98.7 % at aqueous/organic phase volume ratio (R_A/O) of 2. By combining Fourier Transform Infrared Spectroscopy (FTIR) and X-ray photoelectron spectroscopy (XPS), it was established that the extraction of Au(I) followed the mechanism of anion exchange and electrostatic attraction. The extraction efficiency of Au(I) by (C₈)₂dmg⁺Br⁻ was substantially superior to Cu(II), Ni(II), Mn(II), Fe(III) and Co(III) in the thiosulfate leach liquor, showing remarkable selectivity for Au(I). In addition, gold in the loaded GIL phase can be efficiently stripped by NaCl solution. The newly developed extraction system had excellent recycling performance and environmental friendliness, which still maintained high gold extraction efficiency after five extraction/stripping cycles. These results confirmed that the GIL-based extraction system provides a feasible method for green and efficient gold extraction from thiosulfate solution and has a good application prospect.

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来源期刊

Hydrometallurgy 工程技术-冶金工程

CiteScore

9.50

自引率

6.40%

发文量

144

审稿时长

3.4 months

期刊介绍： Hydrometallurgy aims to compile studies on novel processes, process design, chemistry, modelling, control, economics and interfaces between unit operations, and to provide a forum for discussions on case histories and operational difficulties. Topics covered include: leaching of metal values by chemical reagents or bacterial action at ambient or elevated pressures and temperatures; separation of solids from leach liquors; removal of impurities and recovery of metal values by precipitation, ion exchange, solvent extraction, gaseous reduction, cementation, electro-winning and electro-refining; pre-treatment of ores by roasting or chemical treatments such as halogenation or reduction; recycling of reagents and treatment of effluents.