酸性蚀刻废液制备纳米铜粉及其稳定性研究

Preparation and investigation on the stability of nanometer copper powders from acid waste etching solution containing

以酸性蚀刻废液为铜源,水合肼为还原剂,采用液相还原法制备纳米铜粉。研究发现,在氯离子的存在下,直接还原难以得到高纯度的铜粉。介绍了络合还原和除氯后还原两种铜粉制备方法,用铜粉导电率表征其抗氧化性能,并对两种方法制备的铜粉的稳定性进行了比较分析。

Nanometer copper powders were prepared from acidic waste etching solution containing copper using hydrazine hydrate as a reductive agent. Pure copper powders couldn＇t be obtained by directly deoxidizing the solution because of the existence of Cl^-, which could react with Cu^＋ generating deposit cuprous chloride. Two methods were used to avoid the interference of Cl^- ： one is to prepare the complex, the other is to prepare the bluestone, then was deoxidized by hydrazine hydrate. The stability of the powders was studied through the measurement of the conductivity. It is indicated that the existence of Cl^- might accelerate the oxidation of copper powders in the air if it couldn＇t be eliminated during the preparation process.