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


Yüksekdağ A. , Köse Mutlu B. , Wiesner M. R. , Koyuncu İ.

PROCESS SAFETY AND ENVIRONMENTAL PROTECTION, vol.161, pp.210-220, 2022 (Journal Indexed in SCI) identifier identifier

  • Publication Type: Article / Article
  • Volume: 161
  • Publication Date: 2022
  • Doi Number: 10.1016/j.psep.2022.03.035
  • Title of Journal : PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
  • Page Numbers: pp.210-220
  • Keywords: Mixed e-waste, Rare earth elements, Nanofiltration, Supported liquid membrane, Separation, IONIC LIQUIDS, STRATEGIES, REAGENTS

Abstract

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, pretreatment 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.(c) 2022 Institution of Chemical Engineers. Published by Elsevier Ltd. All rights reserved.