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Química Nova

Print version ISSN 0100-4042On-line version ISSN 1678-7064

Abstract

SILVA, Rafael Gundim; AFONSO, Júlio Carlos  and  MAHLER, Claudio Fernando. ACIDIC LEACHING OF Li-ION BATTERIES. Quím. Nova [online]. 2018, vol.41, n.5, pp.581-586. ISSN 1678-7064.  http://dx.doi.org/10.21577/0100-4042.20170207.

This paper describes a route for recovering cobalt and lithium from spent Li-ion batteries via acidic leaching. Sulfuric, hydrochloric, hydrofluoric and formic acids were used as leachants. Hydrogen peroxide was added as reductant, except for formic acid since it is itself a reductant. Experiments were run at 25-40 ºC for 1-3 h. Under the best optimal conditions, the leaching efficiency order was HCl ≈ HF > H2SO4 > HCOOH. Over 90 wt.% of cobalt and lithium were leached by the inorganic acids. The insoluble matter corresponds mainly to the carbon from the cathode. Co(II) was extracted with D2EHPA 16 vol.% diluted in n-hexane at pH ~5 (A/O ratio 1/1 vol/vol, one stage, 25 ºC). Co(II) striping was possible using a dilute leachant (1-2 mol L-1 HCl or H2SO4, 4-5 mol L-1 HF or HCOOH). Lithium was isolated from the raffinate by precipitation as carbonate or phosphate.

Keywords : lithium-ion battery; metals recovery; solvent extraction; cobalt; lithium.

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