论文部分内容阅读
酸性蚀刻废液是一种印制电路板制作过程中产生的强酸、高铜的工业废水,对其回收利用具有较高的经济价值。采用膜电解法处理模拟酸性蚀刻废液,在阴极区回收铜粉。研究了铜粉的形成条件,考察了阴极液铜浓度、温度和电流密度对阴极电流效率的影响。结果表明,阴极液的铜浓度在20~25 g/L,温度为45~50℃,电流密度在11~12 A/dm2,阴极的电流效率最高。随着阴极液酸度的增加,铜粉的纯度提高,但阴极电效会降低。为保证较高的铜粉纯度及阴极电效,阴极液的酸度在0.32~0.36 mol/L为宜。
Acid etching waste liquid is a kind of industrial acid and high copper waste water produced in the process of PCB manufacture, which has high economic value for its recycling. Membrane electrolysis was used to treat simulated acid etching waste liquid and copper powder was recovered in the cathode region. The formation conditions of copper powder were investigated. The effects of catholyte copper concentration, temperature and current density on the cathode current efficiency were investigated. The results show that the catholyte has a copper concentration of 20-25 g / L, a temperature of 45-50 ℃ and a current density of 11-12 A / dm2. The cathode current efficiency is the highest. As the acidity of the catholyte increases, the purity of the copper powder increases, but the cathodic efficiency decreases. In order to ensure a high copper purity and cathodic efficiency, the acidity of the catholyte should be between 0.32 and 0.36 mol / L.