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Effect of pre-concentration on membrane solvent extraction process for the recovery of rare earth elements from dilute acidic leachate

Publication ,  Journal Article
Yuksekdag, A; Kose-Mutlu, B; Wiesner, MR; Koyuncu, I
Published in: Process Safety and Environmental Protection
May 1, 2022

Pre-concentration and separation processes of Rare Earth Elements (REEs) were investigated in terms of several factors. Nitric acid leachate of e-waste was first pre-treated by increasing pH and filtering through microfiltration. For pre-concentration, pre-treated leachate was concentrated by nanofiltration. While a 70% permeate recovery ratio was kept constant, the rare earth elements concentrations were triplicated under optimum conditions. A flat sheet supported liquid membrane process with a polyvinylidene fluoride (PVDF) support membrane was successfully used to extract REEs from the pre-treated leachate. Of the two extractants evaluated, bis-2-ethylhexyl phosphoric acid (D2EHPA) displayed a higher REE separation efficiency than did di-2,4,4,-trimethylpentyl phosphinic acid (Cyanex 272). However, Cyanex 272 separated Sc more selectively. For direct membrane solvent extraction (MSX) and MSX with pre-concentration, pre-treatment pH and D2EHPA concentrations were optimized at values of 1.5% and 15%, respectively. When comparing the results of MSX for direct and pre-concentrated configurations, it was seen that REEs and HREEs recoveries were increased 10% and 30% in MSX with pre-concentration at the end of single-stage MSX. Pre-concentration not only increased the MSX process efficiency but also enabled acid recovery from nanofiltration permeate. A more environmentally friendly and economical process scheme was proposed, including acid recovery from both NF filtrate and post-MSX leaching residue by two different membrane distillation configurations.

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Published In

Process Safety and Environmental Protection

DOI

ISSN

0957-5820

Publication Date

May 1, 2022

Volume

161

Start / End Page

210 / 220

Related Subject Headings

  • Strategic, Defence & Security Studies
  • Chemical Engineering
  • 4019 Resources engineering and extractive metallurgy
  • 4011 Environmental engineering
  • 4004 Chemical engineering
  • 0914 Resources Engineering and Extractive Metallurgy
  • 0911 Maritime Engineering
  • 0904 Chemical Engineering
  • 0102 Applied Mathematics
 

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Yuksekdag, A., Kose-Mutlu, B., Wiesner, M. R., & Koyuncu, I. (2022). Effect of pre-concentration on membrane solvent extraction process for the recovery of rare earth elements from dilute acidic leachate. Process Safety and Environmental Protection, 161, 210–220. https://doi.org/10.1016/j.psep.2022.03.035
Yuksekdag, A., B. Kose-Mutlu, M. R. Wiesner, and I. Koyuncu. “Effect of pre-concentration on membrane solvent extraction process for the recovery of rare earth elements from dilute acidic leachate.” Process Safety and Environmental Protection 161 (May 1, 2022): 210–20. https://doi.org/10.1016/j.psep.2022.03.035.
Yuksekdag A, Kose-Mutlu B, Wiesner MR, Koyuncu I. Effect of pre-concentration on membrane solvent extraction process for the recovery of rare earth elements from dilute acidic leachate. Process Safety and Environmental Protection. 2022 May 1;161:210–20.
Yuksekdag, A., et al. “Effect of pre-concentration on membrane solvent extraction process for the recovery of rare earth elements from dilute acidic leachate.” Process Safety and Environmental Protection, vol. 161, May 2022, pp. 210–20. Scopus, doi:10.1016/j.psep.2022.03.035.
Yuksekdag A, Kose-Mutlu B, Wiesner MR, Koyuncu I. Effect of pre-concentration on membrane solvent extraction process for the recovery of rare earth elements from dilute acidic leachate. Process Safety and Environmental Protection. 2022 May 1;161:210–220.
Journal cover image

Published In

Process Safety and Environmental Protection

DOI

ISSN

0957-5820

Publication Date

May 1, 2022

Volume

161

Start / End Page

210 / 220

Related Subject Headings

  • Strategic, Defence & Security Studies
  • Chemical Engineering
  • 4019 Resources engineering and extractive metallurgy
  • 4011 Environmental engineering
  • 4004 Chemical engineering
  • 0914 Resources Engineering and Extractive Metallurgy
  • 0911 Maritime Engineering
  • 0904 Chemical Engineering
  • 0102 Applied Mathematics