IMR OpenIR
Separating and recycling metal mixture of pyrolyzed waste printed circuit boards by a combined method
Chen, Bin1,2; He, Jie1,2; Sun, Xiaojun1,2; Zhao, Jiuzhou1,2; Jiang, Hongxiang1; Zhang, Lili1
Corresponding AuthorHe, Jie(jiehe@imr.ac.cn)
2020-04-15
Source PublicationWASTE MANAGEMENT
ISSN0956-053X
Volume107Pages:113-120
AbstractWaste printed circuit boards (WPCBs) contain a variety of valuable and hazardous materials. Recycling WPCBs is an important subject not only for environmental protection but also for sustainable development of resources. In this work, a new method combined low-temperature alkaline smelting with liquid-liquid phase separation is proposed to separate and recycle metal mixture in pyrolysis residue of WPCBs of mobile phones. During the low-temperature alkaline smelting process, amphoteric metals Al, Pb, Si, Sn, and Zn are firstly separated and recycled from the metal mixture with the separation rates of 99.5%, 81.6%, 97.8%, 88.4% and 95.7%, respectively. To separate the remaining metal mixture mainly containing elements Cu, Fe, Cr, Ni, Au and Ag, a liquid-liquid phase separation system is designed. As a result, the noble metals Au and Ag are concentrated in the copper-rich substance to form a high-value group, while the elements Ni and Cr distribute in the iron-rich substance. The iron-rich substance can be reused in the liquid -liquid phase separation process. In the super-gravity field, the recycling rates of the metals Au, Ag, Cr and Ni reach 98.1%, 99.8%, 95.6% and 75.4%, respectively. Furthermore, the iron-rich substance can be reused back to the liquid-liquid separation system. The copper-rich substance enriched by the noble metals can be efficiently recovered with low energy consumption and less pollution. This work provides an environmentally friendly and efficient route for separating and recycling the metal mixture in WPCBs. (C) 2020 Elsevier Ltd. All rights reserved.
KeywordMetal recycling Liquid-liquid phase separation Waste printed circuit boards Low-temperature alkaline smelting Noble metals
Funding OrganizationNational Nature Science Foundation of China ; Alexander von Humboldt-Stiftung ; Natural Science Foundation of Liaoning Province of China ; key project of innovation foundation of IMR-CAS
DOI10.1016/j.wasman.2020.04.006
Indexed BySCI
Language英语
Funding ProjectNational Nature Science Foundation of China[51974288] ; National Nature Science Foundation of China[51774264] ; National Nature Science Foundation of China[51574216] ; National Nature Science Foundation of China[51374194] ; National Nature Science Foundation of China[51901231] ; Alexander von Humboldt-Stiftung ; Natural Science Foundation of Liaoning Province of China[2019-MS-332] ; Natural Science Foundation of Liaoning Province of China[2019-BS-253] ; key project of innovation foundation of IMR-CAS[SCJJ-2013-ZD-03]
WOS Research AreaEngineering ; Environmental Sciences & Ecology
WOS SubjectEngineering, Environmental ; Environmental Sciences
WOS IDWOS:000536511400013
PublisherPERGAMON-ELSEVIER SCIENCE LTD
Citation statistics
Cited Times:7[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/138905
Collection中国科学院金属研究所
Corresponding AuthorHe, Jie
Affiliation1.Chinese Acad Sci, Inst Met Res, Shenyang 110016, Peoples R China
2.Univ Sci & Technol China, Sch Mat Sci & Engn, Shenyang 110016, Peoples R China
Recommended Citation
GB/T 7714
Chen, Bin,He, Jie,Sun, Xiaojun,et al. Separating and recycling metal mixture of pyrolyzed waste printed circuit boards by a combined method[J]. WASTE MANAGEMENT,2020,107:113-120.
APA Chen, Bin,He, Jie,Sun, Xiaojun,Zhao, Jiuzhou,Jiang, Hongxiang,&Zhang, Lili.(2020).Separating and recycling metal mixture of pyrolyzed waste printed circuit boards by a combined method.WASTE MANAGEMENT,107,113-120.
MLA Chen, Bin,et al."Separating and recycling metal mixture of pyrolyzed waste printed circuit boards by a combined method".WASTE MANAGEMENT 107(2020):113-120.
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