Application of ionic liquids for rare-earth recovery from waste electric materials

Fukiko Kubota, Masahiro Goto

    Research output: Chapter in Book/Report/Conference proceedingChapter

    4 Citations (Scopus)

    Abstract

    Rare-earth metals are essential for high-technology industries, and demands for rare-earth metals are increasing annually. Their stable supply must be ensured because the production of rare earths is limited to a few countries. Industrial waste and spent products, so-called «urban mines,» have been highlighted as valuable secondary resources. To promote metal recycling, highly efficient separation and recovery techniques are required. We have developed a novel separation technique based on liquid-liquid extraction using unique solvent ionic liquids. A newly synthesized extractant, diglycolamic acid, was used in the ionic-liquid systems. The extraction performance of rare-earth metals and selectivity to common metals were improved significantly. In this chapter, we describe the current state of recycling of rare earths, and summarize ionic-liquid-based extraction focusing on the recovery of rare-earth metals from waste electric materials. A liquid-membrane technique that uses ionic liquids is also introduced.

    Original languageEnglish
    Title of host publicationWaste Electrical and Electronic Equipment Recycling
    Subtitle of host publicationAqueous Recovery Methods
    PublisherElsevier
    Pages333-356
    Number of pages24
    ISBN (Electronic)9780081020579
    ISBN (Print)9780081020586
    DOIs
    Publication statusPublished - Jan 1 2018

    All Science Journal Classification (ASJC) codes

    • Chemistry(all)

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