废动力电池破碎产物风选过程参数分析

Parameters analysis of crushed products of spent power batteries in process of pneumatic separation

基于废动力锂电池正负极材料破碎产物,提出了一种分离铜和铝的新方法。建立了铜铝颗粒在风场中的运动方程,采用二元回归分析构建了水平位移差的回归方程;基于Fluent仿真,分析了气流初始角度和风箱出风口大小对风选效果的影响,从而确定合适的风选参数。基于选定风选参数,采用离散相模型模拟铜铝混合物粒径在1~3 mm时的风选过程,结果显示分离率在95%以上。对铜铝颗粒混合物进行风选实验,分离率达到93%,验证了运动方程的准确性。研究表明:水平位移差与有风区高度、气流初始速度之间存在多元回归关系,可为风箱设计提供理论依据。

Based on the crushed products of anode and cathode materials of spent power batteries,a new method for the separation of copper and aluminum was proposed.The motion equation of copper and aluminum particles in the air field was established and the binary regression analysis were used to construct the regression equation of the horizontal displacement difference.Based on Fluent simulation analysis,the influence of the initial angle of air flow and the size of the air outlet of the wind box on the effect of pneumatic separation was studied to determine the optimal pneumatic separation parameters.Based on the optimal separation parameters,the discrete phase model(DPM)was used to simulate the pneumatic separation process when the particle size of copper-aluminum mixture was in the range of 1-3 mm,and the result shows that the separation rate is above 95%.The pneumatic separation experiment was carried out on the mixture of copper and aluminum particles,and the separation rate reaches 93%,verifying the accuracy of the motion equation.The research shows that there is a real multiple regression relationship between the horizontal displacement difference with the height of the windy area and the initial air velocity,which can provide a theoretical basis for the design of the wind box.