Leaching of valuable metals from spent batteries of electric vehicles using disodium ethylenediaminetetraacetic acid
Artikel i vetenskaplig tidskrift, 2025

This study investigates the efficient extraction of metals, particularly cobalt, from NMC black mass using Na2EDTA as a leaching agent without the need for a reducing agent. Response Surface Methodology (RSM) optimized Na2EDTA concentration, liquid-solid ratio, and initial pH, identifying optimal conditions as 0.5 M Na2EDTA, a liquid-solid ratio of 30 mL g−1, and an initial pH of 4.00. Under these conditions at 80 °C and 300 rpm for 30 min, the highest cobalt leaching efficiency of 71 % was achieved Moreover, nickel (69 %), manganese (70 %), lithium (78 %), copper (63 %), aluminum (42 %), and iron (64 %) were also co-leached. Initial pH was found to significantly influence elemental leaching, with X-ray diffraction (XRD) confirming metal precipitation under high alkalinity. Leaching kinetics demonstrated rapid dissolution of cobalt, nickel, manganese, and lithium within 45 min, reaching the highest efficiencies of approximately 96 %. The highest leaching yields of both aluminum (93 %) and copper (99 %) was attained at 60 min and 90 min, respectively, while iron (70 %) was partially leached throughout the experiment, due to its role as a reducing agent. Residual traces were minimal (<1 % wt) after 45 min. This study provides the first comprehensive assessment of copper, aluminum, and iron leaching efficiencies using EDTA as chelator under weakly acidic conditions and first introduces Na2EDTA as an effective, cost-efficient, and environmentally friendly agent for metal extraction from NMC black mass. These findings advance hydrometallurgical strategies for hazardous battery recycling, offering valuable insights for sustainable resource recovery and environmental stewardship.

NMC

Na2EDTA

Cobalt

Response surface methodology

Lithium-ion battery

Hydrometallurgy

Battery recycling

Författare

Natrawee Khetwunchai

King Mongkut's University of Technology Thonburi

Léa Rouquette

Kärnkemi och industriell materialåtervinning

Saengchai Akeprathumchai

King Mongkut's University of Technology Thonburi

Martina Petranikova

Chalmers, Kemi och kemiteknik, Energi och material

Journal of Environmental Management

0301-4797 (ISSN) 1095-8630 (eISSN)

Vol. 389 126244

Ämneskategorier (SSIF 2025)

Materialkemi

Metallurgi och metalliska material

Drivkrafter

Hållbar utveckling

Styrkeområden

Produktion

Energi

DOI

10.1016/j.jenvman.2025.126244

Mer information

Senast uppdaterat

2025-06-26