摘要
研究了以硝酸银溶液为原料,用氨水作配合剂,抗坏血酸作还原剂,以液相化学还原法制备单分散超细球形银粉,考察了银离子浓度、还原剂浓度、温度、搅拌速度对银粉形貌的影响。确定的优化条件为:硝酸银浓度为0.1mol/L,反应温度为60℃,搅拌速度为350r/min,n(抗坏血酸)/n(硝酸银)=0.6。对优化条件下制备的银粉用扫描电镜、X射线衍射进行形貌和晶形分析,结果表明,所得到的球形银粉分散性好、纯度高、形状规则,平均粒径在0.75μm左右。
The highly purity ultra-fine spherical silver particles were prepared by reducing the silver nitrate using ascorbic acid in the present of ammonia complex. The effects of silver nitrate concentration, ascorbic acid concentration, temperature,stirring rate on the morphology and size of the silver particles were examined. The optimum conditions were determined as silver nitrate concentration of 0.1 mol/L,reaction temperature of 60℃, stirring speed of 350 r/rain and the molar concentration ratio of Ag＋ and aseorbic acid of 0.6. The silver particles prepared under optimized conditions were characterized by SEM and XRD. The results show that the highly purity and monodispersed ultra-fine spherical silver particles can be aquired,and the average diameter is about 0.75 μm.
出处
《湿法冶金》
CAS
北大核心
2013年第6期403-406,共4页
Hydrometallurgy of China
基金
国家自然科学基金资助项目(50974138)
关键词
银粉
液相
化学还原
单分散
超细
球形
silver powder
liquid phase chemical reduction monodispersed ultra-fine
sphericity
