利用废旧线路板回收金属富集体再造超细铜粉

Recovery of ultrafine copper powders from metal components of waste printed circuit boards

实验以氨性溶液溶浸废线路板中回收的金属富集体产出高浓度含铜浸出液作为电解原液,采用电沉积法循环再造超细铜粉。主要考察了电沉积过程中硫酸浓度、电流密度、电沉积时间和电沉积温度等条件对超细铜粉回收率的影响。实验结果表明,在硫酸浓度为12 g/L,电流密度为4 A/dm2,电沉积时间3 h,溶液温度为40℃的条件下,电沉积超细铜粉的回收率超过97%,所得铜粉的树枝状形貌完整,纯度高,粒径小,约为3～6μm。

The ultrafine copper powders were produced by the ammonia leaching and electrodepositing method from waste printed circuit boards. The effects of electrodepositing parameters such as sulfuric acid con- centration, current density, electrodepositing time and temperature of solution on the copper recovery were stud- ied respectively. The results showed that the ultrafine copper powders with high purity and dendrite shape was successfully obtained under the sulfuric acid concentration of 12 g/L, current density of 4 A/dm2＇ electrodepos- iting time of 3 h and temperature of solution of40~C. The size of the copper powder was between 3 and 6 μm,and the copper recovery was over 97%.