TANG Miqi, CHEN Jundong, LI Xue, LU Yan, WANG Jianbo, CHEN Haiyan

(School of Environment and Resource; Ministry of Education Key Laboratory of Solid Waste Treatment and Resource Recycle,Southwest University of Science and Technology, Mianyang 621010, China)

Abstract: On the basis of the existing mechanical and physical recovery technology of waste printed circuit boards (WPCBs), the dismantling process of electronic components (ECs) was improved. In the meantime, the fine crushing of the coarse crushed products and the separation of metals from the fine crushed products were integrated by using the hierarchical impact mill. As a consequence, the automatic WPCBs recycling production line was established. ECs disassembly test, waste printed wiring boards (WPWBs) coarse crushing test and fine crushing-metal separation test of coarse crushing products were carried out. The recovery products of metal and nonmetal were characterized by micromorphology. The effect of the rotary speed of the classifier on the separation efficiency of metallic and nonmetallic products was studied. Finally, the economic evaluation of the production line was carried out. The results show that the production line is simple in technology, low in equipment investment, low in energy consumption and high in profit. The yield reaches 300 kg/h, and the separation efficiency of metal and nonmetal reaches 94.4%. The recovered copper powder is spherical with a grade of 95.4%. It meets the requirements of WPCBs recycling technology and realizes the large-scale and industrial production of WPCBs recycling.

Keywords: waste printed circuit boards；recycling technology; electronic components dismantling system; grading impact mill

中图分类号：X796                                文献标志码：A

文章编号：1008-5548(2019)06-0024-08

DOI:10.13732/j.issn.1008-5548.2019.06.005

收稿日期： 2019-06-05， 修回日期：2019-07-11，在线出版时间：2019-09-30 09:19。

基金项目：四川省教育厅项目，编号：18zd1142；西南科技大学博士基金项目，编号：18zx7116；西南科技大学研究生创新基金资助项目，编号：19ycx0047。

第一作者简介：唐米琦(1994—)，女，硕士研究生，研究方向为电子废弃物资源化。E-mail：819374436@qq.com。

通信作者简介：王建波(1987—)，男，博士，特聘副教授，硕士生导师，研究方向为电子废物资源化、大宗固体废物资源化、环境风险评估与应对策略。E-mail：wangjianbo@swust.edu.cn。