废旧锂离子电池涡流分选模型与影响因素

Model and influencing factors of eddy current separating of spent Li-ion battery

废旧锂离子电池的涡流分选工艺由于影响参数过多,分选效果并不理想。为探明各参数对分选效果的影响,提高涡流分选法的分离效率,开展废旧磷酸铁锂锂离子电池破碎产物的涡流分选研究。利用COMSOL仿真软件模拟磁辊交变磁场分布,建立产物在交变磁场的受力模型与运动模型,研究磁辊长度、磁极对数、磁辊半径、进料速度、磁辊转速、颗粒尺寸和颗粒形状等因素对分选效果的影响,提出将传送带摩擦因数纳入影响参数之中进行模拟,以指导涡流分选模型的建立。上述因素均会影响颗粒的运动轨迹,减小摩擦因数有利于提高分选效率,颗粒尺寸和形状是主要的影响因素。

In the eddy current separating process of spent Li-ion battery,the separating effect is not satisfactory due to the multitude of influencing parameters.To understand the impact of various parameters on the separating effect and improve the separation efficiency of eddy current separating method,a study is conducted on the eddy current separating of crushed products from spent lithium iron phosphate Li-ion battery.Using COMSOL simulation software,the alternating magnetic field distribution of the magnetic roller is simulated.A force model and motion model for the products in the alternating magnetic field are established.Factors such as magnetic roller length,number of magnetic poles,magnetic roller radius,feed speed,magnetic roller rotational speed,particle size and particle shape are studied for their influence on the separating effect.Friction factors on the conveyor belt are included in the simulated parameters to guide the establishment of the eddy current separating model.The above factors will affect the particles′trajectory,reducing friction factors is beneficial to improve separating efficiency.Particle size and shape are the primary influencing factors.