热处理线路板的解离特性及强化重力分选研究  

Study on liberation characteristics and enhanced gravity-separation of heat treatment circuit board

作　　者：马芳源 陶有俊[1] 王一鹏 羡宇帅 赵友男 MA Fangyuan;TAO Youjun;WANG Yipeng;XIAN Yushuai;ZHAO Younan(Key Laboratory of Coal Processing and Efficient Utilization of Ministry of Education,School of Chemical Engineering and Technology,China University of Mining and Technology,Xuzhou,Jiangsu 221116,China)

机构地区：[1]中国矿业大学煤炭加工与高效洁净利用教育部重点实验室化工学院,江苏徐州221116

出　　处：《中国矿业大学学报》2020年第4期765-772,共8页Journal of China University of Mining & Technology

基　　金：国家自然科学基金项目(51874303)。

摘　　要：分析了废弃线路板热处理前后的粒级分布、密度分布特点,并研究了代表性元素的解离度、力学特性和微观形态等物理特性.结果表明:由于热处理过程中玻璃纤维和金属的膨胀系数存在差异,玻璃纤维和铜箔会产生间隙而相互分离,这导致金属单体颗粒普遍存在于粗粒级和高密度区中;最佳强化重力分选条件即转动频率为20Hz、反冲水压为0.03MPa、给料速度为25 mL/s时,热处理和未热处理线路板分选产品金属占比均为80%左右,但热处理后的线路板分选产品的回收率和产率比未热处理的分别高出了11.25%和6.86%,可见热处理线路板在破碎过程中具有选择性和高效性.The distribution of particle size and density for waste printed circuit boards before and after heat treatment were analyzed.And the physical properties such as dissociation degree,mechanical property and micro-morphology of substitute elements were studied as well.The results show that the glass fiber and the copper foil generate gaps and then separate from each other due to the difference in the expansion coefficients of the glass fiber and metals during the heat treatments,which causes that the metal monomer particles generally exist in the coarse-grained and high-density ranges.Under the best enhanced gravity separation conditions of the rotation frequency 20Hz,the recoil water pressure 0.03MPa and the feeding speed 25 mL/s,the heat treatment and untreated circuit boards sorting products account for about 80%of the metal,but the recovery and yield of heat treatment circuit boards sorting product are higher than the untreated ones’by 11.25%and 6.86%,respectively.Hence the heat treatment circuit board has selectivity and high efficiency in the crushing process.

关 键 词：废弃线路板 热处理 强化重力 解离度 

分 类 号：X705[环境科学与工程—环境工程]