LYU Xiang1,LI Zhaopeng2,FEI Peng1,LIN Shuiquan3,WU Lingling1, ZHANG Zhijun1,HE Guicheng1,ZHANG Qiucai1,YU Qing1
(1.School of Resources,Environment and Safety Engineering;National Defense Key Discipline Laboratory of Biotechnology in Uranium Mining and Metallurgy,University of South China,Hengyang 421001,China;2.School of Resources and Safety Engineering, Central South University,Changsha 410083,China;3.Faculty of Land and Resources Engineering, Kunming University of Science and Technology,Kunming 650093,China)
Abstract:The particle morphology and particle size distribution of waste circuit boards before and after microwave pretreatment were analyzed by scanning electron microscope and laser particle size analyzer.The particle size distribution of broken products was taken as the index.A single factor experiment was designed to investigate the effects of different microwave irradiation power,irradiation time and break time on the broken effect of waste printed circuit boards.The results show that microwave pretreatment can effectively promote the broken effect of the waste circuit boards.When the irradiation power is 700 W,the content of less than 0.5 mm particles is 45.8% of mass fraction,which is 19.97% higher than that of the untreated condition.When the irradiation time is 90 s,the content of less than 0.5 mm is 47.2% of mass fraction,which is 21.37% higher than untreated condition.After microwave pretreatment,the structure of the discarded circuit board is obviously damaged,the surface is rough,and the microcracks grow and develop.The broken particles are fine and loose,and the decomposition of metal and nonmetal is obvious.
Keywords:waste circuit board;microwave irradiation;pretreatment;broken characteristics
中图分类号：X76 文献标志码：A
文章编号：1008-5548(2022)05-0073-09
DOI:10.13732/j.issn.1008-5548.2022.05.010
收稿日期： 2022-03-27， 修回日期：2022-05-17，在线出版时间:2022-08-04 14:21。
基金项目：国家自然科学基金项目，编号：51804164、51774187；湖南省高新技术产业科技创新引领计划项目，编号：2020SK2024；湖南省自然科学基金项目，编号：2019JJ50498、2018JJ2329、2018JJ3448、2021JJ30580；湖南省教育厅资助项目，编号：2018B276、2018B266、2018A247、2017A184；金属矿山安全与健康国家重点实验室开放课题项目，编号：zdsys2018-007；湖南省大学生研究性学习和创新性实验计划项目，编号：20202799；南华大学大学生研究性学习和创新性实验计划项目，编号：2020KSZX06、201832。
第一作者简介：吕翔(1997—)，男，硕士研究生，研究方向为微波辅助破磨。E-mail：252152846@qq.com。
通信作者简介：喻清(1984—)，男，讲师，博士，研究方向为微波辅助破磨。E-mail：ckyuqingk@126.com。
