期刊
HYDROMETALLURGY
卷 169, 期 -, 页码 245-252出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.hydromet.2017.01.002
关键词
Copper; Cobalt; Lithium-ion batteries; Aqueous two-phase systems; Liquid-liquid extraction
资金
- Fundacao de Amparo a Pesquisa do Estado de Minas Gerais (FAPEMIG) [TEC-APQ-02202-13, TEC-APQ-03210-15]
- Conselho Nacional de Pesquisa e Desenvolvimento Tecnologico (CNPq) [475946/2013-8]
- CNPq
A new green hydrometallurgical method was developed for the selective extraction of copper and cobalt from spent lithium-ion batteries, using an aqueous two-phase system (ATPS) extraction technique. The method was optimized for the extraction of Cu(II) and Co(II), considering the influence of the following parameters: type and concentration of extractant (1-(2-pyridyl-azo)-2-naphthol (PAN), 1-nitroso-2-naphthol (1N2N), or bis(2,4,4-trimethylpentyl) phosphinic acid (Cyanex 272)); pH (1.00, 6.00, or 11.0); ATPS-forming electrolyte (Na2SO4 or Na3C6H5O7); tie-line length (TLL) of the system; and mass ratio of the top and bottom phases (m(TP)/m(BP)). The recovery efficiency was evaluated in terms of the extraction percentage (%E) and the separation factor (S) between copper and cobalt. The best conditions for selective extraction were achieved using an ATPS composed of L64 + Na2SO4 + H2O, with pH = 6.00, TLL = 50.3% (w/w), m(TP)/m(BP) = 1, and PAN as the extracting agent, which resulted in beta(cu,co)= 322 x 10(2). The method was subsequently applied to a real lithium-ion battery sample, previously leached with HCI and HNO3. Improved separation of copper and cobalt was achieved using successive extraction steps, resulting in beta(cu,co) = 5.40 x 10(5). A stripping assay was also performed, and after a single step, 70.5% of the copper was available for an electrowinning process. (C) 2017 Elsevier B.V. All rights reserved.
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