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A cost-effective strategy for metal recovery from waste printed circuit boards via crushing pretreatment combined with pyrolysis: Effects of particle size and pyrolysis temperature

机译：通过破碎预处理与热解的垃圾印刷电路板从废印刷电路板上复苏的经济型策略：粒径和热解温的影响

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摘要

The dramatic increase in global generation of e-wastes has become a great challenge for sustainable development, and strategies for efficient and environmental-friendly recycling and disposal of e-waste are of great demand. A cost-effective strategy of crushing pretreatment combined with pyrolysis to recover metals from waste printed circuit boards (WPCBs) has been developed. Effects of particle size and pyrolysis temperature on metal recovery were explored. The optimal combination of less energy consumption and higher metal recovery was obtained when the pretreated particle size was 4.0 cm and pyrolysis temperature was 330 degrees C. The Cu and Sn were recovered as zero-valent copper and tin-copper alloy with the recovery efficiency of 92.38 and 99.80 wt%, respectively. Brominated pollutants are easily controlled when pretreated particle size is larger than 2.0 cm and pyrolysis temperature is below 400 degrees C. Under the optimal crushing pretreatment and pyrolysis conditions, the bromine contents in the pyrolysis products of solid residues, liquid tar, and gas were 45.45 wt%, 38.70 wt%, and 15.85 wt%, respectively. The structure of WPCBs was destroyed at 275-525 degrees C due to decomposition of brominated epoxy resins (BERs), which could be accurately characterized by 8 dominating reactions through pyrolysis kinetics analysis. The main reactions took place at conversion of 0.14 and 0.15, corresponding to a pyrolysis temperature of 306-342 degrees C. Thus, the interlayer bonding force of WPCBs significantly decreased, contributing to effective separation of metals in WPCBs. (C) 2020 Elsevier Ltd. All rights reserved.
机译：全球电子废物的戏剧性增加已成为可持续发展的巨大挑战，高效和环境友好的回收和消除电子废物的策略具有很大的需求。已经开发出一种成本效益的破碎预处理策略与热解回收废物印刷电路板（WPCB）的回收。探讨了粒度和热解温对金属回收的影响。当预处理的粒度为4.0cm时获得能量消耗和更高的金属回收率的最佳组合，热解温度为330℃。用零价铜和锡铜合金回收Cu和Sn，回收效率92.38和99.80wt％。预处理粒径大于2.0cm的溴化污染物，热解温度低于400℃。在最佳的破碎预处理和热解条件下，固体残留物，液体焦油和气体的热解产物中的溴含量为45.45重量％，38.70重量％和15.85wt％。由于溴化环氧树脂（BERS）的分解，在275-525摄氏度下，WPCB的结构在275-525℃下破坏，这可以通过热解动力学分析精确地表征8个主导反应。主要反应在0.14和0.15的转化率下进行，对应于306-342℃的热解温度。因此，WPCB的中间层键合力显着降低，有助于有效分离WPCB中的金属。 （c）2020 elestvier有限公司保留所有权利。

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  • 来源
    《Journal of Cleaner Production》 |2021年第2期|124505.1-124505.11|共11页
  • 作者

    Chen Ye; Liang Sha; Xiao Keke; Hu Jingping; Hou Huijie; Liu Bingchuan; Deng Huali; Yang Jiakuan;

  • 作者单位

    Huazhong Univ Sci & Technol HUST Sch Environm Sci & Engn 1037 Luoyu Rd Wuhan 430074 Hubei Peoples R China|Hubei Prov Engn Lab Disposal & Recycling Technol 1037 Luoyu Rd Wuhan 430074 Hubei Peoples R China;

    Huazhong Univ Sci & Technol HUST Sch Environm Sci & Engn 1037 Luoyu Rd Wuhan 430074 Hubei Peoples R China|Hubei Prov Engn Lab Disposal & Recycling Technol 1037 Luoyu Rd Wuhan 430074 Hubei Peoples R China;

    Huazhong Univ Sci & Technol HUST Sch Environm Sci & Engn 1037 Luoyu Rd Wuhan 430074 Hubei Peoples R China|Hubei Prov Engn Lab Disposal & Recycling Technol 1037 Luoyu Rd Wuhan 430074 Hubei Peoples R China;

    Huazhong Univ Sci & Technol HUST Sch Environm Sci & Engn 1037 Luoyu Rd Wuhan 430074 Hubei Peoples R China|Hubei Prov Engn Lab Disposal & Recycling Technol 1037 Luoyu Rd Wuhan 430074 Hubei Peoples R China;

    Huazhong Univ Sci & Technol HUST Sch Environm Sci & Engn 1037 Luoyu Rd Wuhan 430074 Hubei Peoples R China|Hubei Prov Engn Lab Disposal & Recycling Technol 1037 Luoyu Rd Wuhan 430074 Hubei Peoples R China;

    Huazhong Univ Sci & Technol HUST Sch Environm Sci & Engn 1037 Luoyu Rd Wuhan 430074 Hubei Peoples R China|Hubei Prov Engn Lab Disposal & Recycling Technol 1037 Luoyu Rd Wuhan 430074 Hubei Peoples R China;

    Dongjiang Environm Co Ltd Shenzhen 518057 Guangdong Peoples R China;

    Huazhong Univ Sci & Technol HUST Sch Environm Sci & Engn 1037 Luoyu Rd Wuhan 430074 Hubei Peoples R China|Hubei Prov Engn Lab Disposal & Recycling Technol 1037 Luoyu Rd Wuhan 430074 Hubei Peoples R China|Huazhong Univ Sci & Technol HUST State Key Lab Coal Combust 1037 Luoyu Rd Wuhan 430074 Hubei Peoples R China;

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  • 正文语种 eng
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  • 关键词

    Waste printed circuit boards (WPCBs); Metal recovery; Crushing pretreatment; Pyrolysis; Energy consumption;

    机译：废纸电路板（WPCB）;金属回收;破碎预处理;热解;能量消耗;

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