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http://dx.doi.org/10.7844/kirr.2022.31.1.21

Separation of Co(II), Ni(II), and Cu(II) from Sulfuric Acid Solution by Solvent Extraction  

Moon, Hyun Seung (Department of Advanced Materials Science & Engineering, Institute of Rare Metal, Mokpo National University)
Song, Si Jeong (Department of Advanced Materials Science & Engineering, Institute of Rare Metal, Mokpo National University)
Tran, Thanh Tuan (Department of Advanced Materials Science & Engineering, Institute of Rare Metal, Mokpo National University)
Lee, Man Seung (Department of Advanced Materials Science & Engineering, Institute of Rare Metal, Mokpo National University)
Publication Information
Resources Recycling / v.31, no.1, 2022 , pp. 21-28 More about this Journal
Abstract
The smelting reduction of spent lithium-ion batteries results in metallic alloys of cobalt, nickel, and copper. To develop a process to separate the metallic alloys, leaching of the metallic mixtures of these three metals with H2SO4 solution containing 3% H2O2 dissolved all the cobalt and nickel, together with 9.6% of the copper. Cyanex 301 selectively extracted Cu(II) from the leaching solution, and copper ions were completely stripped with 30% aqua regia. Selective extraction of Co(II) from a Cu(II)-free raffinate was possible using the ionic liquid ALi-SCN. Three-stage cross-current stripping of the loaded ALi-SCN by a 15% NH3 solution resulted in the complete stripping of Co(II). A process was proposed to separate the three metal ions from the sulfuric acid leaching solutions of metallic mixtures by employing solvent extraction.
Keywords
Spent lithium ion batteries; cobalt; nickel; copper; solvent extraction;
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