ACIDIC LEACHING OF Li-ION BATTERIES Rafael Gundim Silva Júlio Carlos Afonso Claudio Fernando Mahler 10.6084/m9.figshare.6503648.v1 https://scielo.figshare.com/articles/dataset/ACIDIC_LEACHING_OF_Li-ION_BATTERIES/6503648 <p></p><p>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.</p><p></p> 2018-06-13 02:56:02 lithium-ion battery metals recovery solvent extraction cobalt lithium