Downstream recovery of Li and value-added metals (Ni, Co, and Mn) from leach liquor of spent lithium-ion batteries using a membrane-integrated hybrid system

Ramesh Kumar, Chengjia Liu, Geon Soo Ha, Young Kwon Park, Moonis Ali Khan, Min Jang, Sang Hyoun Kim, Mohammed A. Amin, Amel Gacem, Byong Hun Jeon

Research output: Contribution to journalArticlepeer-review

35 Scopus citations

Abstract

The end-of-life management of a large number of discarded lithium-ion batteries (LiBs) has become a global issue because of the steady increase in their usage every year. In this study, a novel membrane-integrated hybrid system was developed for recycling commercially valuable metals while treating acidic leach liquor obtained from spent LiBs (mostly LiFePO4 type). Alkaline (NaOH and NH4OH)-pretreated leach liquor (pH adjusted to 5.53) was ultrafiltered to ensure the effective removal of Fe and Al and reduce the turbidity (∼1.6 NTU) prior to processing in a nanofiltration system. The nanofiltration membrane (VNF2) was applied successfully to obtain the rejection values of 92.5% (Ni2+), 94.6% (Co2+), and 95.8% (Mn2+) while permeating > 89.6% of Li+ with 7.5 L/m2·h of flux under optimized conditions of transmembrane pressure (10 bar) and crossflow rate (2.25 m3/h) in the recirculation mode. The fractionation of monovalent ions from bivalent ions was performed in a concentrated mode to enrich the bivalent metal ions, Ni2+, Co2+, and Mn2+ from 0.74, 0.52, and 0.63 g/L to 6.14, 4.59, 5.62 g/L, respectively, at 90% recovery of the feed solution. The Li+ (21.1 g/L) that was contained in the nanofiltrate permeate stream was crystallized into Li2CO3; a purity of 99.5 wt% was obtained at 88.2% recovery using 4 M K2CO3 at an operating temperature of 70 °C. Hence, the proposed novel system can lead to the development of a clean and sustainable process for the recycling of precious metal ions from end-of-life LiBs for reuse on a commercial scale.

Original languageEnglish
Article number137507
JournalChemical Engineering Journal
Volume447
DOIs
StatePublished - 1 Nov 2022

Keywords

  • Lithium recovery
  • Lithium-ion battery
  • Membrane-integrated hybrid system
  • Nanofiltration
  • Sustainable technology

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