High copper recovery from scrap printed circuit boards using poly(ethylene glycol)/sodium hydroxide treatment

被引:3
|
作者
Zhang, Cong-Cong [1 ]
Zhang, Fu-Shen [1 ,2 ]
机构
[1] Chinese Acad Sci, Dept Solid Waste Treatment & Recycling, Res Ctr Ecoenvironm Sci, 18 Shuangqing Rd, Beijing 100085, Peoples R China
[2] Univ Chinese Acad Sci, Beijing 100049, Peoples R China
基金
中国国家自然科学基金;
关键词
E-waste; Printed circuit boards; Separation; Chemical recycling; BROMINATED EPOXY-RESIN; ELECTRONIC EQUIPMENT WEEE; WASTE; TECHNOLOGY; SEPARATION; METALS; LIQUID; WATER; ACID;
D O I
10.1007/s10311-017-0676-5
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
Recycling scrap printed circuit boards for recovery of valuable metal resources is a major environmental issue. Most available disposal technologies are not environmentally safe. Here, printed circuit board particles were subjected to solvothermal treatment using poly(ethylene glycol)/sodium hydroxide. Results show that residual ratio of bromine varied with temperature, treating time and sodium hydroxide addition. The optimal temperature, treating time and sodium hydroxide addition were 180 A degrees C, 10 h and 0.4 g, with the lowest residual bromine ratio of 1.7%. After treatment, the separation of residue was done by gravity separation and the purity of copper in the recovered metallic components was 97.8%. The recyclability of scrap printed circuit boards before crushing was also compared, the residue of which yielded a complete separation of copper foils and glass fibers. The purity of copper in the foil was achieved at 96.6%. We conclude that this novel process represents an applicable way to recycle high value resources from scrap printed circuit boards.
引用
收藏
页码:311 / 317
页数:7
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