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Recycling of electronic waste: Printed wiring boards.

机译：电子废物的回收：印刷线路板。

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摘要

Pyrolysis and leaching are the dominant techniques applied in the recycling of waste printed wiring boards (PWBs). Waste PWB pyrolysis is a highly polluting technology and produces brominated pyrolysis oils in addition to hydrogen bromide (HBr) gas. Moreover, leaching as a treatment process of waste PWBs is not well investigated. In this work, the pyrolysis of waste PWBs has been studied with the aim of reducing the amount of brominated oils and HBr gas evolved.;The effects of powder inorganic chemicals (CaO, CaCO3, Fe 2O3, Al2O3, Y-Zeolite, and ZSM-5) additions on the pyrolysis of waste PWBs has been studied through experiments using a thermogravimetric-differential thermal analyzer connected to a mass spectrometer (TG-DTA-MS) and in a tube furnace at 900 °C. It has been shown that the kinetic models by Friedman, Flynn-Wall-Ozawa, and Kissinger are applicable to waste PWB pyrolysis at temperatures below 400 °C. Moreover, CaO, CaCO3, Fe2O3, Y-Zeolite, and ZSM-5 show a potential to reduce the amount of HBr gas evolved during pyrolysis in TG-DTA-MS. However, in the tube furnace pyrolysis experiments, CaO and CaCO3 were found to be the most effective chemical additions, with more than 90% reduction in total bromine (HBr and other brominated gases) evolved.;It has also been demonstrated that the sequential leaching of waste PWBs with hydrochloric acid, nitric acid and aqua regia is capable of selective recovery of base and precious metals contained in waste PWBs.
机译：热解和浸出是回收废印刷线路板（PWB）的主要技术。废弃的PWB热解是一种高污染技术，除溴化氢（HBr）气体外，还生产溴化热解油。而且，对于作为废弃PWB的处理方法的浸出没有得到很好的研究。在这项工作中，对废PWB的热解进行了研究，目的是减少溴化油和HBr气体的释放。粉末无机化学品（CaO，CaCO3，Fe 2O3，Al2O3，Y-沸石和ZSM的影响） -5）通过使用连接到质谱仪（TG-DTA-MS）的热重差热分析仪和在900°C的管式炉中进行的实验研究了添加废PWB的热解。研究表明，Friedman，Flynn-Wall-Ozawa和Kissinger的动力学模型适用于温度低于400°C的废PWB热解。此外，CaO，CaCO3，Fe2O3，Y-沸石和ZSM-5显示出减少TG-DTA-MS热解过程中释放出的HBr气体量的潜力。然而，在管式炉热解实验中，发现CaO和CaCO3是最有效的化学添加物，释放出的总溴（HBr和其他溴化气体）减少了90％以上；还证明了连续浸出含有盐酸，硝酸和王水的废PWB能够选择性地回收废PWB中所含的贱金属和贵金属。

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  • 作者

    Luyima, Alex.;

  • 作者单位

    Missouri University of Science and Technology.;

  • 授予单位 Missouri University of Science and Technology.;
  • 学科 Engineering Materials Science.
  • 学位 Ph.D.
  • 年度 2013
  • 页码 155 p.
  • 总页数 155
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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