摘要
基于电子垃圾中稀贵金属环保、高效、低能耗的回收需求,采用CPFD(计算颗粒流体动力学法),Barracuda气固耦合数值分析软件建立电子垃圾颗粒气固分离模型,为避免颗粒受重力作用导致颗粒动能逐渐增大从而与空气作用后形成密度波以及颗粒在受到气流作用后混乱发散,在竖直方向上增加多个颗粒惯性聚焦板,模拟电子垃圾颗粒在多次横向气流及惯性聚焦作用下的分选特性,探究在不同质量流率、不同气流速度以及不同聚焦宽度下电子垃圾中稀贵金属颗粒的分离效率。结果表明,电子垃圾进口质量流率与聚焦宽度对电子垃圾中稀贵金属颗粒的分离有显著影响,当一次气流速度为4.2m/s、二次气流速度为4.8m/s、三次气流速度为3m/s、四次气流速度为3.2m/s、气流开口宽度为50mm、入料开口宽度为4mm、颗粒惯性聚焦板的聚焦宽度为9mm、一次气流口距离入料口150mm、进口质量流率为10g/s时,铜的品位可达84%、回收率为88.5%;金的品位和回收率分别为78.1%和90.2%。说明在多次横向气流和惯性聚焦作用下,可有效实现对电子垃圾中稀贵金属颗粒多梯度、高精度的有效分选。改变电子垃圾进口质量流率和聚焦宽度可以有效提高电子垃圾中稀贵金属的分离效率,同时对多密度颗粒的干法分选提供借鉴和参考。
Based on the recycling requirements of environmental protection,high efficiency and low energy consumption of rare and precious metals in E-waste,the gas-solid separation model of E-waste particles was established by using CPFD and Barracuda gas-solid coupling numerical analysis software.In order to avoid the gradual increase of particle kinetic energy caused by gravity and the formation of density wave after interaction with air,and the chaotic divergence of particles after being affected by air flow,multiple particle inertial focusing plates were added in the vertical direction to simulate the separation characteristics of E-waste particles under multiple transverse air flows and inertial focusing.The study explored the separation efficacy of rare and precious metal particles in E-waste with varying mass flow rates,airflow velocities,and focusing widths.The outcomes demonstrate that the inlet mass flow rate and focusing width of the E-waste profoundly impacts the separation of the concerned particles.When the velocity of the primary airflow is 4.2 m/s,the velocity of the secondary airflow is 4.8 m/s,the velocity of the tertiary airflow is 3 m/s,and the velocity of the fourth airflow is 3.2 m/s,with an airflow opening width of 50 mm,a feed opening width of 4 mm,a particle inertial focusing plate with a focusing width of 9 mm,a distance of 150 mm between the primary airflow port and the feed port,and an inlet mass flow rate of 10 g/s,the copper grade can reach 84%and the recovery is 88.5%.The gold has a grade of 78.1%and a recovery of 90.2%.This indicates that the rare and precious metals in E-waste can be effectively separated through multi-gradient and high-precision methods using multiple transverse airflow and inertial focusing.Adjusting the inlet mass flow rate and focusing width of E-waste can enhance the separation efficacy of rare and valuable metals in E-waste,and establish a basis for the dry separation of multi-density particles.
作者
薛建勇
柳忠彬
温培忠
龚佳
王亚琳
何萍萍
XUE Jianyong;LIU Zhongbinl;WEN Peizhong;GONG Jia;WANG Yalin;HE Pingping(College of Mechanical Engineering,Sichuan University of Science&Engineering,Yibin 644000,Sichuan,China;The Sichuan Key Laboratory of Mine Tailings Resource Utilization,Yibin 644000,Sichuan,China;The Sichuan Key Laboratory of Process Equipment&Control Engineering,Yibin 644000,Sichuan,China;China Nuclear Jianzhong Nuclear Fuel Component Co.,Ltd.,Yibin 644oo0,Sichuan,China)
出处
《有色金属（选矿部分）》
CAS
2024年第8期68-76,共9页
Nonferrous Metals（Mineral Processing Section）
基金
四川省凉山州重点研发计划项目(22ZDYF0164)
四川轻化工大学创新基金项目(Y2022051)。
关键词
CPFD
分选
电子垃圾颗粒
惯性聚焦
CPFD
sorting
electronic waste particles
inertial focusing
