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Triboelectric separation technology for removing inorganics from non-metallic fraction of waste printed circuit boards: Influence of size fraction and process optimization

机译:摩擦电分离技术从废印刷电路板的非金属部分中去除无机物:尺寸部分的影响和工艺优化

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摘要

Removing inorganics from non-metallic fraction (NMF) of waste printed circuit boards (WPCBs) is an effective mean to improve its usability. The effect of size fraction on the triboelectric separation of NMF of WPCBs was investigated in a lab triboelectric separation system and the separation process was optimized in this paper. The elements distribution in raw NMF collected from typical WPCBs recycling plant and each size fraction obtained by sieving were analyzed by X-ray fluorescence (XRF). The results show that the main inorganic elements in NMF are P, Ba, Mn, Sb, Ti, Pb, Zn, Sn, Mg, Fe, Ca, Cu, Al and Si. The inorganic content of each size fraction increased with the size decreasing. The metal elements are mainly distributed in -0.2 mm size fraction, and concentrated in middle product of triboelectric separation. The loss on ignition (LOI) of positive product and negative product is higher than that of the middle product for the -0.355 mm size fraction, while the LOI presents gradually increasing trend from negative to positive plate for the +0.355 mm size fraction. Based on the separation results and mineralogical characterizations of each size fraction of NMF, the pretreatment process including several mineral processing operations was added before triboelectric separation and better separation result was obtained.
机译:从废印刷电路板(WPCB)的非金属部分(NMF)中去除无机物是提高其可用性的有效手段。在实验室摩擦电分离系统中研究了尺寸分数对WPCB的NMF摩擦电分离的影响,并优化了分离工艺。通过X射线荧光(XRF)分析了从典型的WPCB回收工厂收集的原始NMF中的元素分布以及通过筛分获得的每个尺寸分数。结果表明,NMF中的主要无机元素为P,Ba,Mn,Sb,Ti,Pb,Zn,Sn,Mg,Fe,Ca,Cu,Al和Si。每个尺寸部分的无机含量随尺寸减小而增加。金属元素主要以-0.2 mm的尺寸分数分布,并集中在摩擦电分离的中间产物中。对于-0.355 mm尺寸分数,正极和负极产品的灼烧损失(LOI)高于中间产品的灼烧损失(LOI),而对于+0.355 mm尺寸分数,LOI呈现从负板到正极板的逐渐增加的趋势。根据分离结果和每个NMF粒度级分的矿物学特征,在摩擦电分离之前添加了包括几种矿物加工操作在内的预处理工艺,获得了更好的分离效果。

著录项

  • 来源
    《Waste Management》 |2017年第2期|42-49|共8页
  • 作者单位

    School of Chemical Engineering and Technology, China University of Mining & Technology, Xuzhou, Jiangsu 221116, China,Key Laboratory of Coal Processing and Efficient Utilization, China University of Mining & Technology, Xuzhou, Jiangsu 221116, China;

    School of Chemical Engineering and Technology, China University of Mining & Technology, Xuzhou, Jiangsu 221116, China,Key Laboratory of Coal Processing and Efficient Utilization, China University of Mining & Technology, Xuzhou, Jiangsu 221116, China;

    School of Chemical Engineering and Technology, China University of Mining & Technology, Xuzhou, Jiangsu 221116, China,Key Laboratory of Coal Processing and Efficient Utilization, China University of Mining & Technology, Xuzhou, Jiangsu 221116, China,Advanced Analysis & Computation Center, China University of Mining & Technology, Xuzhou, Jiangsu 221116, China;

    School of Chemical Engineering and Technology, China University of Mining & Technology, Xuzhou, Jiangsu 221116, China,Key Laboratory of Coal Processing and Efficient Utilization, China University of Mining & Technology, Xuzhou, Jiangsu 221116, China;

    School of Chemical Engineering and Technology, China University of Mining & Technology, Xuzhou, Jiangsu 221116, China,Key Laboratory of Coal Processing and Efficient Utilization, China University of Mining & Technology, Xuzhou, Jiangsu 221116, China;

    Advanced Analysis & Computation Center, China University of Mining & Technology, Xuzhou, Jiangsu 221116, China;

    Advanced Analysis & Computation Center, China University of Mining & Technology, Xuzhou, Jiangsu 221116, China;

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

    Waste printed circuit boards; Non-metallic fraction; Triboelectric separation; Size fraction;

    机译:废印刷电路板;非金属部分;摩擦电分离尺寸分数;

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