Separation of rare earth elements from mixed-metal feedstocks by micelle enhanced ultrafiltration with sodium dodecyl sulfate.

Journal Article (Journal Article)

Micelle enhanced ultrafiltration (MEUF) is a surfactant-based membrane separation process that may be used to separate target ions from mixed metal aqueous solutions, such as leachates of coal ash and other geological wastewaters. The ability of MEUF to separate rare earth elements (REEs) was evaluated using sodium dodecyl sulfate (SDS) as the sorbent in surfactant micelle phase, which was subsequently separated using ultrafiltration, acidification, and ferricyanide precipitation. Separation experiments were performed with a synthetic coal ash leachate feedstock as an example mixed-metal feedstock. Experiments tested the influence of surfactant concentration, pH, and co-existing competitive ions on REE recoveries, and also tested methods for SDS recovery and reuse. Membrane rejection efficiencies of REEs were 97% and 71% respectively for synthetic and real leachate under optimized operating conditions. A two-step process of precipitation with CaCl2 and Na2 CO3 following membrane separation was the best for recovering SDS with a yield of 99.7%.

Full Text

Duke Authors

Cited Authors

  • Kose-Mutlu, B; Hsu-Kim, H; Wiesner, MR

Published Date

  • March 2022

Published In

Volume / Issue

  • 43 / 7

Start / End Page

  • 1013 - 1025

PubMed ID

  • 32812520

Electronic International Standard Serial Number (EISSN)

  • 1479-487X

International Standard Serial Number (ISSN)

  • 0959-3330

Digital Object Identifier (DOI)

  • 10.1080/09593330.2020.1812732


  • eng