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

Fukiko Kubota, Masahiro Goto

Research output: Chapter in Book/Report/Conference proceedingChapter

1 Citation (Scopus)


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
Number of pages24
ISBN (Electronic)9780081020579
ISBN (Print)9780081020586
Publication statusPublished - Jan 1 2018


All Science Journal Classification (ASJC) codes

  • Chemistry(all)

Cite this

Kubota, F., & Goto, M. (2018). Application of ionic liquids for rare-earth recovery from waste electric materials. In Waste Electrical and Electronic Equipment Recycling: Aqueous Recovery Methods (pp. 333-356). Elsevier.