Effect of ionic liquid [MIm]HSO4 on WPCB metal-enriched scraps refined by slurry electrolysis
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Waste printed circuit boards (WPCBs) are usually dismantled, crushed, and sorted to WPCB metal-enriched scraps, still containing an amount of non-metallic materials. This research used slurry electrolysis to refine these WPCB metal-enriched scraps and to examine if a standard ionic liquid, [MIm]HSO4, can replace H2SO4 in the system. The impact of the refinement process on metal migration and transformation is discussed in detail. The results demonstrated that metals in WPCB metal-enriched scraps could be successfully refined using slurry electrolysis, and [MIm]HSO4 can be used to replace H2SO4 in the system. When 80% of H2SO4 was replaced by [MIm]HSO4 (electrolyte of 200 mL, 30 g/L CuSO4·5H2O, 60 g/L NaCl, 130 g/L H2SO4, and 1.624 A for 4 h), the total metal recovery rate is 85%, and the purity, current efficiency, and particle size of cathode metal powder were 89%, 52%, and 3.77 μm, respectively. Moreover, the microstructure of the cathode metal powder was dendritic in the H2SO4-CuSO4-NaCl slurry electrolysis system, whereas at an 80% [MIm]HSO4 substitution rate slurry electrolysis system, the cathode metal powder was irregular and accumulated as small-sized spherical particles. Thus, replacing inorganic leaching solvents with ionic liquids may provide a potential choice for the resources in WPCB metal-enriched scraps.
KeywordsWPCBs Ionic liquid Slurry electrolysis Metals and nonmetals Refining
The research is supported by the National Natural Science Foundation of China (21377104) and Research Fund of Southwest University of Science and Technology (14tdgk01, 17LZX422, 17LZXT05, 18LZX414).
- Baldé CP, Forti V, Gray V, Kuehr R, Stegmann P (2017) The global E-waste Monitor-2017, United Nations University (UNU), International Telecommunication Union (ITU) & International Solid Waste Association (ISWA), Bonn/Geneva/ViennaGoogle Scholar
- Debnath B, Chowdhury R, Ghosh SK (2018) Sustainability metal recovery from E-waste. Front Environ Sci Eng 12(2). https://doi.org/10.1007/s11783-018-1044-9
- Liu XN, Tan QX, Li YG, Xu ZH, Chen MJ (2017) Copper recovery from waste printed circuit boards concentrated metal scraps by electrolysis. Front Environ Sci Eng 11(10.1007/s11783-017-0997-4):10Google Scholar
- Popescu AM, Donath C, Neacsu EI, Soare V, Constantin V (2016) Preliminary Study for Copper Recovery in WEEE Leachate by Using Ionic Liquids Based on Choline Chloride. Rev Chim-Bucharest 67:1076–1079. http://www.revistadechimie.ro/pdf/POPESCU%20A
- Wang JQ (2017) Hydrometallurgical leaching technology for WPCBs: the interaction of Cu/Zn/Pb. Southwest University of Science and Technology http://t.cn/Eb4URMu. Accessed 27 March 2017
- Wang JQ, Chen MJ, Zhang S, Li FF (2017a) Leaching rule of copper, zinc, lead from waste printed circuit board by ionic liquid. Environ Prot Chem Ind 37:232–236. https://doi.org/10.3969/j.issn.1006-1878.2017.02.019 Google Scholar
- Yong-Qing SU, Yang MD, Wang YZ, Cong LI, Wang H, Cai Y (2011) Preparation and structure characterization of Ni nanoparticles prepared in medium containing [Bmim]NTf_2 ionic liquids. Nonferrous Metals 3:6–8. https://doi.org/10.3969/j.issn.1007-7545.2011.03.002 Google Scholar