Life cycle analysis of the ionic liquid leaching process of valuable metals from electronic wastes

Vallejos-Michea, Camila; Barrueto, Yahaira; Jiménez, Yecid P.

doi:10.1016/j.jclepro.2022.131357

Cited by 7 publications

(1 citation statement)

References 29 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Into the concept of urban mining, gold appeared in a series of solid wastes, such as electronic devices and scraps, printed circuit boards, jewelry scraps, etc., and generally after the separation of undesirable components, gold is first dissolved from the solid waste via acidic leaching in aqua regia medium, though the use of ionic liquids as the leaching medium is also considered [ 6 ]. From this highly acidic medium, gold is separated from other less valuable metals by different separation technologies prior to its final recovery step.…”

Section: Introductionmentioning

confidence: 99%

On the Use of Pseudo-Protic Ionic Liquids to Extract Gold(III) from HCl Solutions

Robla

2023

IJMS

View full text Add to dashboard Cite

Solvent extraction of gold(III) from HCl media using pseudo-protic ionic liquids (PPILs) dissolved in toluene as the extractant phase is investigated. Three PPILs are generated from the reaction of commercially available amines and 1 M HCl solution and named as pri-NH2H+Cl- (derived from the primary amine Primene 81R), sec-NHH+Cl− (derived from the secondary amine Amberlite LA2) and ter-NH+Cl− (derived from the tertiary amine Hostarex A327). In the above structures, -NH2H+Cl−, -NHH+Cl− and -NH+Cl− represented the active groups (anion exchangers) of the respective PPIL. In the case of gold(III) extraction, the experimental variables investigated included the equilibration time (2.5–30 min), temperature (20–60 °C), HCl concentrations (1–10 M) in the aqueous phase, gold(III) concentration (0.005–0.05 g/L) in this same phase, and PPILs concentrations in the organic phase. From the experimental data, and using the Specific Interaction Theory, the interaction coefficients (ε) for the pair AuCl4−, H+ are estimated for the systems involving the three PPILs. Gold(III) is recovered from the metal-loaded organic phases using sodium thiocyanate solutions, and from these, gold is finally recovered by the precipitation of zero-valent gold (ZVG) nanoparticles.

show abstract

Section: Introductionmentioning

confidence: 99%