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Title: Liquid-liquid extraction of rare earth elements using systems that are more environmentally friendly : advances, challenges and perspectives.
Authors: Neves, Heyder Pereira
Ferreira, Gabriel Max Dias
Ferreira, Guilherme Max Dias
Lemos, Leandro Rodrigues de
Rodrigues, Guilherme Dias
Leão, Versiane Albis
Mageste, Aparecida Barbosa
Keywords: Separation
Eco-friendly liquid–liquid extraction
Cloud point extraction
Aqueous biphasic system
Issue Date: 2022
Citation: NEVES, H. P. et al. Liquid-liquid extraction of rare earth elements using systems that are more environmentally friendly: advances, challenges and perspectives. Separation and Purification Technology, v. 282, artigo 120064, 2022. Disponível em: <>. Acesso em: 11 out. 2022.
Abstract: The rare earth elements, a group of metals consisting of the lanthanide series, together with yttrium and scan- dium, are increasingly important in high technology industries worldwide. Given the need to expand production of these elements, there is a search for processes to obtain them that are less environmentally damaging, since the rare earths production chain is associated with several environmental problems and concerns. Solvent extraction, one of the important steps involved in the obtaining of rare earth elements, is receiving much attention in the scientific and industrial community, with a renewed search for approaches that avoid the use of organic solvents. Among the various options, cloud point extraction and the use of aqueous two-phase systems are alternatives to the use of traditional organic solvents. This review considers these two more environmentally friendly techniques and their use for the extraction and/or separation of rare earth elements. The issues addressed include their potential to replace traditional liquid–liquid extraction, in terms of the efficiency, toxicity, and biodegradability of the components forming the systems, as well as their potential applications and future perspectives.
ISSN: 1383-5866
Appears in Collections:DEQUI - Artigos publicados em periódicos

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