Editorial
Introduction to the RSC Advances themed collection on metal extraction and recycling
Professor Isabelle Billard, Professor Alexandre Chagnes, Dr Euan Doidge, Professor Jason Love and Professor Magdalena Regel-Rosocka, introduce this RSC Advances themed collection on metal extraction and recycling.
Paper
Extraction of Se(IV) and Se(VI) from aqueous HCl solution by using a diamide-containing tertiary amine
A protonated diamide containing tertiary amine (EHBAA) can extract Se(IV) and Se(VI) from HCl via solvation and anion-exchange reactions, respectively.
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Towards electrochemical iridium recycling in acidic media: effect of the presence of organic molecules and chloride ions
Green recycling of iridium made possible with the aid of organic compounds.
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Two-step leaching of spent lithium-ion batteries and effective regeneration of critical metals and graphitic carbon employing hexuronic acid
A comprehensive and environmentally friendly approach for recycling critical metals as well as graphitic carbon from discarded LIBs was proposed. To regenerate pure graphitic carbon a two-step leaching process was adopted.
Paper
Circular economy in hot-dip galvanizing with zinc and iron recovery from spent pickling acids
The management of spent pickling acids (SPA) is an environmental challenge for the hot-dip galvanizing (HDG) industry. We demonstrate at pilot scale the recovery of iron chloride from the SPA of HDG and its reuse at a WWTP facility
Paper
A multi-faceted approach to probe organic phase composition in TODGA systems with 1-alcohol phase modifiers
The effect of varying 1-alcohol alkyl chain length on extraction of lanthanides (Lns), H2O, and H+ was studied with tetraoctyl diglycolamide (TODGA) via solvent extraction coupled with FT-IR investigations.
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Recycling of NdFeB magnets employing oxidation, selective leaching, and iron precipitation in an autoclave
The proposed conceptual flowsheet for high REEs recovery from spent NdFeB magnets.
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Solubility of ammonium metal fluorides in aqueous ethanol mixtures – implications for scandium recovery by antisolvent crystallization
The solubility of ammonium metal fluorides is evaluated in NH4F–ethanol mixtures and the implications for antisolvent crystallization of (NH4)3ScF6 are discussed.
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Production of rare earth element oxide powders by solution combustion: a new approach for recycling of NdFeB magnets
A promising flowsheet is proposed for REEs recovery from NdFeB magnets, as follows: (1) acid baking, (2) employment of ultrasound-assisted water leaching, (3) the production of rare earth oxides (RE oxides) by a solution combustion method, and (4) a calcination process.
Paper
Harnessing magnetic fields for rare-earth complex crystallization–separations in aqueous solutions
Magnetic crystallization was used as an energy-efficient technique for selective separation of paramagnetic rare-earth ions from lanthanum ions. An air-stable and simple RE-DOTA complex system was used to achieve separation in aqueous conditions.
Paper
Removal of hexavalent chromium ions using micellar modified adsorbent: isothermal and kinetic investigations
In this investigation, anionic sodium dodecyl (SDS) and cationic cetyltrimethylammonium bromide (CTAB) surfactants were separately applied to locally accessible wheat bran to remove chromium(VI).