Environmentally Friendly Extraction and Recovery of Cobalt from Simulated Solution of Spent Ternary Lithium Batteries Using the Novel Ionic Liquids of [C₈H₁₇NH₂][Cyanex 272]

Abstract

An environmentally friendly recycling process of cobalt (Co2+) from simulated solution for spent ternary lithium batteries was demonstrated in this research. The novel task-specific ionic liquids (TSILs) of [C8H17NH2]­[Cyanex 272] were synthesized by one-step reaction of n-octylamine and Cyanex 272. The TSILs have good performance for selective extraction and separation of Co2+. The separation factor of Co2+ and Ni2+ (βCo/Ni) was 976.9 using the two-stage cross-flow extraction, and the extraction percentage of Li+ (E Li) was zero. Efficient selective separation of Co2+ from simulated solution containing Ni2+ and Li+ can be achieved using this environmentally friendly process. High purity CoSO4·7H2O (99.7 wt %) was obtained from the simulated solution using the processes of extraction, stripping, scrubbing, and evaporation crystallization. The conceptual recycling flow-sheet for Co2+ from spent ternary lithium batteries was presented on the basis of the new environmentally friendly extraction process. The mechanism of extractive reaction of Co2+ using the [C8H17NH2]­[ Cyanex 272] was investigated according to the slope method and FT-IR spectra.

Extraction of Cu(II), Fe(III), Zn(II), and Mn(II) from Aqueous Solutions with Ionic Liquid R4NCy

“…In the case of metal extraction with ILs, the list is too long; several elements are studied with these green reagents, for example, molybdenum, rare earth, precious metals, chromium, iron, copper, cobalt, lead, and zinc [23][24][25][26][27][28][29][30][31][32][33].…”

“…Jing and coworkers recovered cobalt selectively from lithium batteries using the ionic liquid [C 8 H 17 NH 2 ] [Cyanex 727]. The system has a good performance and produces a final product CoSO 4 × 7H 2 O, with high purity (99.7%) [24]. Rybka and Regel-Rosocka report Ni(II) and Co(II) extraction with the use of Cyphos IL 101 and Cyphos IL 104 in chloride media.…”

Design and combination of magnetic ionic liquids and hydrophobic deep eutectic solvents for safer extraction of titanium: physicochemical properties and toxicity studies

“…[34][35][36] For example, Jing et al reported a novel ionic liquid [C 8 H 17 NH 2 ][Cyanex272], which was synthesized using n-octylamine and Cyanex 272, for the recovery of cobalt from a simulated solution of spent ternary lithium batteries. 37 The nitrogen atoms of n-octylamine combined with the H + provided by Cyanex 272, then the cation [C 8 H 17 NH 3 ] + was formed. Recently, studies that report that amides constitute the cations of protic ILs have gradually aroused the interest of researchers.…”

Single-Stage Extraction and Separation of Co2+ from Ni2+ Using Ionic Liquid of [C4H9NH3][Cyanex 272]

“…After single-stage extraction, the TSIL-based extraction phase containing Co[Cyanex 272] 2 can be stripped with 0.5 mol/L H 2 SO 4 ( Figure 7 ). The stripping percentage of Co 2+ from TSIL-based extraction phase was about 99.2% with the optimized stripping conditions, i.e., stripping phase ratio of 1:1, stripping time of 35 min, and stripping temperature of 308 ± 1 K. The product of CoSO 4 ·7H 2 O was obtained from the stripping phase using evaporation crystallization [ 44 ]. The product of Ni(OH) 2 can be obtained from the raffinate of the aqueous phase containing Ni 2+ using the precipitation method [ 45 ].…”