Selective gold recovery from pregnant thiocyanate leach solution using ion exchange resins

Azizitorghabeh, Atefeh; Mahandra, Harshit; Ramsay, J. O.; Ghahreman, Ahmad

doi:10.1016/j.hydromet.2023.106055

Cited by 19 publications

(8 citation statements)

References 19 publications

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“…For a typical extraction procedure, 1.0 mL of a specific IL was mixed with 5.0 mL of [Au(S 2 O 3 ) 2 ] 3− solution (10 mg dm −3 of gold, 0.1 mol dm −3 of Na 2 S 2 O 3 , 1.0 mol dm −3 of NH 3 , and 5 mmol dm −3 of CuSO 4 ) under stirring at 25 °C for 20 min. After centrifugation, the gold concentration in the water phase was determined by an atomic absorption spectrophotometer (AAS, TAS-990, Beijing Puxi General Instrument Co., Ltd., Beijing, China) [ 6 , 7 , 8 , 9 , 10 , 11 ]. The elemental contents of the actual thiosulfate gold leaching solution were measured by inductively coupled plasma optical emission spectrometry (ICP-OES, model Optima 8000, Perkin Elmer, Waltham, MA, USA) [ 6 , 7 , 8 , 9 , 10 , 11 ].…”

Section: Methodsmentioning

confidence: 99%

“…Despite the environmental benefits of the thiosulfate leaching method, the recovery of a low level of gold from the leaching solution containing a high concentration of thiosulfate [ 1 , 2 , 4 ] remains a significant challenge. Various methods such as adsorption with anion exchange resin [ 6 ], activated carbon [ 7 ], and silica gel [ 8 ], as well as solvent extraction [ 9 , 10 , 11 ], have been employed to recover gold from thiosulfate solutions. Solvent extraction is considered a preferable option for gold recovery due to its continuous operation, high capacity, and ease of scaling up for industrial use [ 9 , 10 , 11 ].…”

Section: Introductionmentioning

confidence: 99%

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Highly Efficient and Selective Extraction of Gold from Thiosulfate Leaching Solution Using Functionalized Dicationic Ionic Liquids

Zhou,

Fan,

Zhang

2024

Molecules

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Thiosulfate leaching has been regarded as a promising alternative to cyanidation, but it still faces the challenge of the recovery of low content of gold from high concentrations of thiosulfate solutions. Liquid–liquid extraction is a method to address this issue but is still limited by the use of volatile and toxic organic solvents. To overcome this limitation, this work synthesized some functionalized dicationic ionic liquids (DILs) to serve as extraction solvents for the recovery of the gold–thiosulfate complex, [Au(S2O3)2]3−, from thiosulfate solutions. Experimental results indicated that the DILs showed higher extraction rates toward [Au(S2O3)2]3− compared with their monocationic-based counterparts, likely due to the stronger electrostatic interaction between the dications of the ILs and [Au(S2O3)2]3−. The transfer of [Au(S2O3)2]3− from the water phase to the IL phase was identified as an anion exchange and endothermic process. The rate of extraction was limited by the anion exchange process occurring at the IL–water interface. The extraction ability of ILs highly depended on the type of anion; specifically, the ILs with anions that had strong hydrogen-bonding ability exhibited high extraction ability toward [Au(S2O3)2]3−. Finally, DILs proved effective in the recovery of [Au(S2O3)2]3− from an actual gold leaching solution and exhibited high selectivity toward coexisting ions, indicating their potential as environmentally friendly solvents for gold recovery.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Highly Efficient and Selective Extraction of Gold from Thiosulfate Leaching Solution Using Functionalized Dicationic Ionic Liquids

Zhou,

Fan,

Zhang

2024

Molecules

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“…In this approach, the gold ore sample flows through column containing an ion exchange resin (Choi et al, 2020). The resin has a high affinity for gold, so when the ore sample interacts with the resin, there is gold absorption by the resin (Azizitorghabeh et al, 2023). Once the resin is saturated with gold, the next step involves leaching of the resin to separate the gold from the resin.…”

Section: Introductionmentioning

confidence: 99%

Optimization Flotation Process Using Two Types of Collectors at PT. Florrea Indonesia

Triandika,

Sukamto,

Sudaryanto

et al. 2024

j. of. metallurgical. eng. and. process. technol.

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The tailings slurry used in this research originated from company X in Kuala Lipis, Pahang, Malaysia. The primary objective of this study is to determine the percentage of recovery, concentrate content, and Au concentration ratio in the tailings slurry. The research employs a quantitative method involving flotation testing. The flotation process involved two sets of experiments: one without the FX2 collector (tests 1 and 2) and another using both the F7042W and FX2 collectors (tests 3 and 4). dxThe research findings revealed that the percentage of Au recovery in single-collector flotation using FX2 (test 1) was 56.47%, with a concentration ratio of 19.78. In test 2, it was 52.59%, with a mass concentration ratio of 21.57. Meanwhile, the percentage of Au recovery in dual-collector flotation using F7042W and FX2 (test 3) was 68.77%, with a concentration ratio of 16.55, and in test 4, it was 69.45%, with a concentration ratio of 16.93. Based on the results of this research, it can be concluded that the flotation process employing two collectors, namely F7042W and FX2, as investigated in this study, was successful because percent recovery, concentration ratio, and Au content in the concentrate compared to single collector flotation.

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“…[2][3][4][5] During the last few years, the study of new materials for the improvement of capacitive properties has led nanostructures to play a fundamental role since the increase in the electro-active area has shown interesting results. [6][7][8][9] Among materials that have attracted a lot of attention are conducting polymers, CP, whose properties have allowed the development of different devices, such as biomolecules (e.g., enzymes and bacteria), [10][11][12][13][14][15] nanoparticles, 16 separation/storage of target gas, 17 electrochemical sensors, 18,19 rechargeable batteries, 6,20,21 and capacitors. 6,[22][23][24][25][26] It is important to note that CP-based energy storage is achieved through its doping/undoping process.…”

Section: Introductionmentioning

confidence: 99%

Capacitors based on PEDOT nanowire electrodeposits

Gacitúa,

del Valle,

Ramírez

2023

J of Applied Polymer Sci

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The capacitive properties of poly(3,4‐ethylenedioxythiophene) nanowires (PEDOT‐nw) obtained in situ by the electrosynthesis of EDOT in acetonitrile by cyclic voltammetry on a transparent ITO electrode that has been previously modified with a thin layer of PEDOT, on which mesoporous SiO2 is deposited. Silica acts as a template for the generation of polymer nanowires. The voltammetric profiles are consistent with a large increase in the surface area of the electrode, while their Raman spectroscopy and SEM microscopy demonstrate the formation of polymer nanostructures on the electrode surface. Also, by SEM, the presence of PEDOT deposit is verified in the form of nanowires 30 nm in diameter. On the other hand, galvanostatic measurements show a 20 times higher specific capacity for PEDOT‐nw (516.12 Fg−1) compared to PEDOT bulk (19.62 Fg−1). In the case of PEDOT‐nw, it is also worth noting a 92.3% retention capacity after 1000 successive charge/discharge cycles. Thus, it is verified that PEDOT‐nw modified electrodes are an excellent candidate to be used in polymer‐based capacitors.

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Selective gold recovery from pregnant thiocyanate leach solution using ion exchange resins

Cited by 19 publications

References 19 publications

Highly Efficient and Selective Extraction of Gold from Thiosulfate Leaching Solution Using Functionalized Dicationic Ionic Liquids

Highly Efficient and Selective Extraction of Gold from Thiosulfate Leaching Solution Using Functionalized Dicationic Ionic Liquids

Optimization Flotation Process Using Two Types of Collectors at PT. Florrea Indonesia

Capacitors based on PEDOT nanowire electrodeposits

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