电选法回收废印刷线路板中金属Cu的研究

Study on Recovery of Copper from Waste Printed Wiring Boards by Electrostatic Separation

采用破碎机和高压电选机对废印刷线路板中金属Cu进行回收.结果表明,破碎产物粒度<0.9mm时金属的单体解离度较高,可以作为分选的原料.物料在电选过程中的动力学分析表明,影响电选效果的主要因素为电极电压、滚筒转速、电晕电极距及物料粒度.经正交实验优化影响参数后,-0.9+0.074mm粒级的破碎产物一次电选所得精料中Cu的富集情况较好,Cu品位由32.0%富集到63.6%,回收率为78.7%.

Recovery of Cu from waste printed wiring boards （PWBs） was studied by crushers and electrostatic separator. The results of pulverizing experiment show that liberation degree of metal is higher in grain size - 0.9 ＋ 0.074mm, the product of this grain size can be used as raw material in electrostatic ,separation. The main factors that influence electrostatic separation are found by dynamic analysis of particles in course of electrostatic separation, it conclude electrode voltage, roller rotate speed, electric coronary polar distance and granularity of particles. The - 0.9 ＋ 0.074mm pulverizing product is separated through single stage electrostatic separation after optimizing influence factors. Result shows that the enrichment condition of Cu in fine material is good, Cu could be concentrated from 32.0 % to 63.6 %, and recovery ratio is 78.7 %.