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| Liquid nitrogen modification-mechanical crushing method to separate and recycle waste photovoltaic panels |
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Received:April 29, 2021
Revised:May 08, 2021
Accepted:May 08, 2021
Published Online:June 29, 2021
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| DOI： |
| KeyWord:Mechanical pretreatment; Liquid nitrogen modification; Silicon enrichment; Photovoltaic panel |
| Author | Institution |
| zhangxuefeng |
Key Laboratory of Green Process and Engineering, Institute of Process Engineering, Chinese Academy of Sciences;Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology |
| yanyang |
Key Laboratory of Green Process and Engineering, Institute of Process Engineering, Chinese Academy of Sciences;Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology |
| wangdong |
Key Laboratory of Green Process and Engineering, Institute of Process Engineering, Chinese Academy of Sciences;Ganjiang Innovation Academy, Chinese Academy of Sciences |
| wangzhi |
Key Laboratory of Green Process and Engineering, Institute of Process Engineering, Chinese Academy of Sciences;Innovation Academy for Green Manufacture, Chinese Academy of Sciences |
| wujijun |
Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology |
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| Abstract: |
| As the total installed photovoltaic capacity in my country is increasing year by year, there will be a large amount of photovoltaic solid waste that needs to be recycled and processed in the future. Photovoltaic panel is the main component of photovoltaic power generation equipment. The toxic gas released by simple crushing and pyrolysis of photovoltaic panels has great harm to the ecological environment. Moreover, the valuable resources can not be used with high value. Liquid nitrogen was used to modify the photovoltaic panels, and the mechanical crushing method was used to crush the modified photovoltaic panels. In this paper, the effects of liquid nitrogen modification on silicon material enrichment and glass removal were studied, and the distribution of main materials such as silicon material, glass, metal and organic matter in different particle size fractions was investigated. The results show that compared with unmodified PV panels, the adhesion of EVA (Ethylene Vinyl Acetate Copolymer) in PV panels decreases and the brittleness of EVA increases after liquid nitrogen treatment, and it is easier to fall off from the interface of each component. The removal rate and enrichment rate of glass modified by liquid nitrogen are better than that of normal temperature. When the PV panels were mechanically broken for 8 s after liquid nitrogen modification, the highest silicon enrichment rate was 72%, and the glass removal rate was 70%. As a pre-treatment step of photovoltaic panels, mechanical crushing makes most EVA film on the surface of photovoltaic panels exposed. At the same time, the weight of the post-treatment material is effectively reduced, and the diffusion channel is more created, which can strengthen the deep separation of subsequent chemical methods. |
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