二次进风与折流对电子废弃物干法分选的影响

基于电子废弃物高效、物理分离的回收需求，建立了电子废弃物颗粒干法分选模型，在常规一次气流分选的基础上增加折流与二次进风强化电子废弃物颗粒气固耦合分离特征，研究表明结果，折流角度与二次进风气速对电子废弃物颗粒迁移轨迹和分离行为有显著影响，当进风开口大小为35 mm,一次进风速度为3.2 m/s,二次进风速度为3.6 m/s且折流角度为25°时，金的回收率达99.66%,金品位达84.35%,铜的回收率达77.91%,铜品位达88.28%,富集比为4.41,且塑料颗粒与金、铜颗粒分离效果最佳。说明在控制适当二次进风气流速度与颗粒折流角度下可显著提高电子废弃物分选的经济性，且分离环境友好，研究成果为电子废弃物无污染回收提供了一种新的参考。

Study on Effect of Secondary Air Intake and Folding on Dry Sorting of Electronic Waste

Based on the recovery needs of efficient and physical separation of electronic waste, a dry sorting model of electronic waste particles is established. The gas-structured separation characteristics of secondary air intake and folding are added on the basis of conventional primary airflow sorting. And the results show that the folding angle and secondary air intake velocity have a significant impact on the migration trajectory and separation behavior of e-waste particles. When the size of the air intake opening is 35mm, the primary air intake speed is 3.2m/s, the secondary air inlet speed is 3.6m/ s and the folding angle is 25°. The recovery rate of gold is 99.66%, the grade is 84.35%. The recovery rate of copper is 77.91%, the grade is 88.28% and the enrichment ratio is 4.41. The separation effect between plastic particles and gold and copper particles is the best. It shows that under the control of the appropriate secondary air intake velocity and particle folding angle, the economics of e-waste sorting can be significantly improved and the separation is environmentally friendly. The research results of this paper provide a new reference for the pollution-free recycling of e-waste.