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

Hyun Seung Moon; Si Jeong Song; Tuan Tran Thanh; Man Seung Lee

doi:10.7844/kirr.2022.31.1.21

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2022 Vol.31, Issue 1 Preview Page Next Page

Research Paper

Separation of Co(II), Ni(II), and Cu(II) from Sulfuric Acid Solution by Solvent Extraction 황산용액에서 용매추출에 의한 코발트(II), 니켈(II) 및 구리(II) 분리

28 February 2022. pp. 21-28

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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

폐리튬이온배터리를 고온에서 용융환원시키면 코발트, 니켈 및 구리 금속합금상을 얻을 수 있다. 이러한 금속합금상으로부터 금속을 분리회수하기 위한 공정을 개발하기 위해 코발트, 니켈 및 구리 금속을 혼합한 금속혼합물을 3% 과산화수소를 함유한 2 M 황산용액으로 침출하면 9.6%의 구리와 함께 코발트와 니켈이 모두 침출된다. 침출용액에서 Cyanex 301로 구리(II)가 선택적으로 추출되었으며, 30% 왕수로 구리(II)를 탈거했다. 구리가 분리된 여액에서 이온성액체인 ALi-SCN으로 Co(II)를 선택적으로 추출했으며, 15%의 암모니아용액으로 3단의 교차식 탈거를 통해 모두 탈거했다. 본 연구를 통해 코발트, 니켈 및 구리 금속혼합물의 황산침출액에서 용매추출로 세 금속을 분리할 수 있는 공정을 제안했다.

키워드

폐리튬전지

코발트

니켈

구리

용매추출

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Information

Publisher :The Korean Institute of Resources Recycling
Publisher(Ko) :한국자원리싸이클링학회
Journal Title :Resources Recycling
Journal Title(Ko) :자원리싸이클링
Volume : 31
No :1
Pages :21-28
Received Date : 2021-09-18
Revised Date : 2021-12-01
Accepted Date : 2021-12-08
DOI :https://doi.org/10.7844/kirr.2022.31.1.21

Resources Recycling ISSN:2765-3439(Print) 2765-3447(Online) 자원리싸이클링

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