A strategy to determine the potential interval for selective silver electrodeposition from ammoniacal thiosulfate solutions

Alonso, Alejandro R.; Lapidus, G.T.; González, Ignacio

doi:10.1016/j.hydromet.2006.08.009

Cited by 21 publications

(13 citation statements)

References 24 publications

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“…, concentration of ligand, pH). For example, thermodynamic analysis has been carried out to identify potential levels where selective deposition of dilute concentrations of silver or gold from concentrated copper-containing solutions occurs—the potentials turned out to be shifted to cathodic direction as the concentration of thiosulfate increased ( Alonso et al., 2007 ; Reyes Cruz et al., 2002 ; Spitzer and Bertazzoli, 2004 ), providing a way of modulating selectivity via speciation and potential control. In addition, some weakly binding ligands can exhibit the same speciation effect by having high concentration; for example, concentrated chloride leads to different electrodeposition behavior of Cu and Te, enabling the selective extraction of the different metals ( Jin et al., 2018 ).…”

Section: Future Perspectives and Opportunitiesmentioning

confidence: 99%

Electrochemical approaches for selective recovery of critical elements in hydrometallurgical processes of complex feedstocks

Kim¹,

Candeago²,

Rim³

et al. 2021

iScience

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Summary Critical minerals are essential for the ever-increasing urban and industrial activities in modern society. The shift to cost-efficient and ecofriendly urban mining can be an avenue to replace the traditional linear flow of virgin-mined materials. Electrochemical separation technologies provide a sustainable approach to metal recovery, through possible integration with renewable energy, the minimization of external chemical input, as well as reducing secondary pollution. In this review, recent advances in electrochemically mediated technologies for metal recovery are discussed, with a focus on rare earth elements and other key critical materials for the modern circular economy. Given the extreme heterogeneity of hydrometallurgically-derived media of complex feedstocks, we focus on the nature of molecular selectivity in various electrochemically assisted recovery techniques. Finally, we provide a perspective on the challenges and opportunities for process intensification in critical materials recycling, especially through combining electrochemical and hydrometallurgical separation steps.

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Section: Future Perspectives and Opportunitiesmentioning

confidence: 99%

Electrochemical approaches for selective recovery of critical elements in hydrometallurgical processes of complex feedstocks

Kim¹,

Candeago²,

Rim³

et al. 2021

iScience

View full text Add to dashboard Cite

show abstract

“…Some authors consider this technique feasible while others disagree. The high copper concentration and reactions involving oxidation or reduction of thiosulphate are considered the main barriers for the gold recovery by electrochemical techniques (Alonso et al, 2007; Aylmore, 2005; Aylmore and Muir, 2001; Grosse et al, 2003; Harrison and Thompson, 1973; Trindade and Barbosa Filho, 2002).…”

Section: Introductionmentioning

confidence: 99%

Determination of the potential gold electrowinning from an ammoniacal thiosulphate solution applied to recycling of printed circuit board scraps

et al. 2015

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The use of electrochemical techniques in the selective recovery of gold from a solution containing thiosulphate, ammonia, and copper, obtained from the leaching of printed circuit boards from mobile phones using ammoniacal thiosulphate, are shown in this work. First, cyclic voltammetry tests were performed to determine the potential of electrodeposition of gold and copper, and then, electrowinning tests at different potentials for checking the rates of recovery of these metals were performed. The results of the cyclic voltammetry show that copper deposition occurs at potentials more negative than -600 mV (Ag/AgCl), whereas the gold deposition can be performed at potentials more positives than -600 mV (Ag/AgCl). The results of electrowinning show that 99% of the gold present in solutions containing thiosulphate and copper can be selectively recovered in a potential range between -400 mV (vs Ag/AgCl) and -500 mV (vs Ag/AgCl). Furthermore, 99% of copper can be recovered in potentials more negative than -700 mV (vs Ag/AgCl).

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“…Several works have developed the technology for the recovery of Cu, Au, Ag, Pb, Zn, and Mn from batteries, computers, cell phones, electronic cards, and mine tailings by hydrometallurgical and electro-reduction processes (Alonso et al 2004, Poisot-Díaz et al 2008, 2012. The results show a clear advantage in the selectivity; however, the principal condition is that the electro-reduction potential must be quite separated.…”

Section: Introductionmentioning

confidence: 99%

Thermodynamic and Electrochemical Study of Vanadium Solutions: Towards Vanadium Recovery From a Spent Catalyst

Antaño-López¹,

Hernández-Pérez²,

Espejel‐Ayala³

2021

RICA

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Due to the low abundance of vanadium in nature (about 135 g/t), the feasibility to recover it from industrial wastes has highly attracted scientific and technological attention. The main recovery routes reported are associated with chemical or thermochemical processes. However, the electrochemical recovery of vanadium from industrial wastes has been poorly investigated. In this work, a thermodynamic and electrochemical study for the possible vanadium recovery from a spent catalyst generated in the petrochemical industry was conducted. The study was divided into two stages using low vanadium concentrations. In the first stage, the recovery of vanadium was possible in its V4+ state at low reduction potentials, whereas for the second stage, cyclic voltammetry was used to calculate the diffusion coefficient and the heterogeneous velocity coefficient of the V5+/V4+ redox pair. The obtained values are similar to those reported in the literature for aqueous solutions at high vanadium concentrations and would allow the design of the system at large scale. This report aims to set the conditions for the possible vanadium recovery from a spent catalyst by means of electrochemical processes, although the optimization of such conditions must be further explored.

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A strategy to determine the potential interval for selective silver electrodeposition from ammoniacal thiosulfate solutions

Cited by 21 publications

References 24 publications

Electrochemical approaches for selective recovery of critical elements in hydrometallurgical processes of complex feedstocks

Electrochemical approaches for selective recovery of critical elements in hydrometallurgical processes of complex feedstocks

Determination of the potential gold electrowinning from an ammoniacal thiosulphate solution applied to recycling of printed circuit board scraps

Thermodynamic and Electrochemical Study of Vanadium Solutions: Towards Vanadium Recovery From a Spent Catalyst

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