Journal
METALS
Volume 12, Issue 6, Pages -Publisher
MDPI
DOI: 10.3390/met12061056
Keywords
high cobalt LIBs; acid leaching; precipitation; solvent extraction; selectivity
Funding
- Department of Science and Technology (DST, India)
- Academy of Finland (Finland) under the Indo-Finnish Mobility Program 2019 [C/980/IFD 2019-20]
- Business Finland as part of the BATCircle (Finland-based Circular Ecosystem of Battery Metals) consortium [5715/31/2018]
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In this study, hydrometallurgical recycling of metals from high-cobalt-content spent lithium-ion batteries from laptops was explored. The purification processes of precipitation and solvent extraction were used. The results showed that the electrode material of the batteries contained significant amounts of cobalt, nickel, manganese, and lithium. By using precipitation and solvent extraction techniques, 99.9% pure cobalt sulfate was successfully synthesized from the leach liquor of the spent batteries.
In this work, hydrometallurgical recycling of metals from high-cobalt-content spent lithium-ion batteries (LIBs) from laptops was studied using precipitation and solvent extraction as alternative purification processes. Large amounts of cobalt (58% by weight), along with nickel (6.2%), manganese (3.06%) and lithium (6.09%) are present in LiCoO2 and Li2CoMn3O8 as prominent Co-rich phases of the electrode material. The pregnant leach solution (PLS) that was generated by leaching in the presence of 10% H2O2 using 50 g/L pulp density at 80 degrees C for 4 h contained 27.4 g/L Co, 3.21 g/L Ni, 1.59 g/L Mn and 3.60 g/L Li. The PLS was subjected to precipitation at various pH using 2 M NaOH but the purification performance was poor. To improve the separation of Mn and other impurities and in order to avoid the loss of cobalt and nickel, separation studies were carried out using a solvent extraction technique using di-(2-ethylhexyl) phosphoric acid (D2EHPA) and bis-(2,4,4-trimethylpentyl) phosphinic acid (Cyanex 272). Overall, this study examines the fundamentals of separating and synthesizing 99.9% pure Co sulfate from leach liquor of spent laptop LIBs with remarkably high cobalt content.
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