铜氨水系中-价铜氨络离子的氧化
来源期刊：中国有色金属学报1999年第4期
论文作者：孙驰 余仲兴 周邦娜 陈世琯
文章页码：821 - 826
关键词：铜氨水系；铜氨络离子；Cu(Ⅰ)氧化
Key words：copper-ammonia-water system; ammoniacal copper complexion; oxidation of Cu(Ⅰ)
摘 要：微细铜粉是可替代贵金属生产电子浆料的重要原材料。在常压铵盐歧化工艺生产微细铜粉过程中，制取一价铜氨络离子溶液是关键步骤，而一价铜氨络离子在空气中极易被氧化。借助Cu(Ⅱ)/Cu(Ⅰ)电对氧化还原电位的测定来获知不同时刻一价铜氨络离子的浓度，研究了一价铜氨络离子的氧化速度及其影响因素。实验表明：溶液温度越低、气相中氧分压愈小、NH3·H2O浓度越大以及NH+4的加入均有利于阻缓一价铜氨络离子的氧化。
Abstract: Fine copper powder has potentiality to be used instead of precious metals powder for preparation of conductive ink. In production of fine copper powder by disproportionation of ammoniacal cuprous salt under normal pressure, the preparation of cuprous complex solution is the key to the whole process owing to its high oxidability in the air. The oxidation rate of Cu(Ⅰ) and factors influencing on it were investigated by electrochemical method, i.e. measuring the redox potentials of Cu(Ⅱ)/Cu(Ⅰ) couple as a function of [Cu(Ⅰ)] at different moments and conditions. Experimental results showed that decreasing the p(O2) or the reaction temperature and increasing the concentration of NH3·H2O or NH+4 are all helpful to inhibit the oxidation process.
