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Recycling WEEE: Polymer characterization and pyrolysis study for waste of crystalline silicon photovoltaic modules

机译：回收WEEE：结晶硅光伏组件废料的聚合物表征和热解研究

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摘要

Photovoltaic (PV) modules contain both valuable and hazardous materials, which makes its recycling meaningful economically and environmentally. In general, the recycling of PV modules starts with the removal of the polymeric ethylene-vinyl acetate (EVA) resin using pyrolysis, which assists in the recovery of materials such as silicon, copper and silver. The pyrolysis implementation, however, needs improvement given its importance. In this study, the polymers in the PV modules were characterized by Fourier transform infrared spectroscopy (FTIR) and the removal of the EVA resin using pyrolysis has been studied and optimized. The results revealed that 30 min pyrolysis at 500 ℃ removes ＞99% of the polymers present in photovoltaic modules. Moreover, the behavior of different particle size milled modules during the pyrolysis process was evaluated. It is shown that polymeric materials tend to remain at a larger particle size and thus, this fraction has the greatest mass loss during pyrolysis. A thermo gravimetric analysis (TGA) performed in all polymeric matter revealed the optimum pyrolysis temperature is around 500 ℃. Temperatures above 500 ℃ continue to degrade matter, but mass loss rate is 6.25 times smaller. This study demonstrates the use of pyrolysis can remove ＞99% of the polymeric matter from PV modules, which assists the recycling of this hazardous waste and avoids its disposal.
机译：光伏（PV）模块包含有价材料和有害材料，这使其回收利用在经济和环境方面都有意义。通常，PV模块的回收利用热解去除聚合的乙烯-乙酸乙烯酯（EVA）树脂开始，这有助于回收硅，铜和银等材料。然而，鉴于其重要性，热解实施需要改进。在这项研究中，通过傅里叶变换红外光谱（FTIR）对光伏组件中的聚合物进行了表征，并研究和优化了热解法去除EVA树脂的方法。结果表明，在500℃下热解30分钟可去除光伏组件中存在的＞ 99％的聚合物。此外，评估了在热解过程中不同粒度的研磨模块的行为。结果表明，聚合物材料倾向于保留较大的粒径，因此，该级分在热解过程中具有最大的质量损失。在所有聚合物中进行的热重分析（TGA）表明，最佳热解温度为500℃左右。 500℃以上的温度会继续降解物质，但质量损失率却小6.25倍。这项研究表明，使用热解技术可以从PV组件中去除> 99％的聚合物，这有助于回收这种有害废物并避免其处置。

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  • 来源
    《Waste Management》 |2017年第2期|716-722|共7页
  • 作者

    Pablo Dias; Selene Javimczik; Mariana Benevit; Hugo Veit;

  • 作者单位

    Programa de Pos-Graduacao em Engenharia de Minas, Metalurgica e de Materials (PPGE3M), Universidade Federal do Rio Grande do Sul (UFRGS), Av. Bento Goncalves, 9500, 91509-900 Porto Alegre, RS, Brazil;

    Programa de Pos-Graduacao em Engenharia de Minas, Metalurgica e de Materials (PPGE3M), Universidade Federal do Rio Grande do Sul (UFRGS), Av. Bento Goncalves, 9500, 91509-900 Porto Alegre, RS, Brazil;

    Programa de Pos-Graduacao em Engenharia de Minas, Metalurgica e de Materials (PPGE3M), Universidade Federal do Rio Grande do Sul (UFRGS), Av. Bento Goncalves, 9500, 91509-900 Porto Alegre, RS, Brazil;

    Programa de Pos-Graduacao em Engenharia de Minas, Metalurgica e de Materials (PPGE3M), Universidade Federal do Rio Grande do Sul (UFRGS), Av. Bento Goncalves, 9500, 91509-900 Porto Alegre, RS, Brazil;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Crystalline silicon; Pyrolysis; Polymers removal; Recycling; Solar panel;

    机译：结晶硅;热解;去除聚合物;回收;太阳能板;

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