用化学还原法从含银电镀废液中回收银的研究  

Study on the Recovery of Silver from Silver Electrolytic Effluents by Chemical Reduction Method

作　　者：江成军[1] 张振忠[1] 赵芳霞[1] 杨江海[1] 王鹏[1] 

机构地区：[1]南京工业大学材料科学与工程学院,江苏南京210009

出　　处：《贵金属》2010年第1期33-36,共4页Precious Metals

基　　金：江苏省科技厅社会发展计划项目(BS2007120);江苏省火炬计划项目(H2007306);南京工业大学无机及复合新材料重点实验室资助项目

摘　　要：研究了用化学还原法从电镀银废液中回收银时,Na2S2O4/Ag+摩尔比、温度等因素对银回收率的影响,得到的最佳回收工艺条件为:Na2S2O4/Ag+摩尔比为2.5,温度35℃,pH=7.5,搅拌速度300 r/min,用此工艺银的回收率可达99.98%。采用XRD、XRF、TEM、SAED对回收的银粉体进行了表征,银粉纯度较高,成球链状分布,平均粒径为175.8 nm。In this paper, silver was recovered from the silver electrolytic effluents by chemical reduction method. The effects of various factors such as Na2S2On/Ag^＋ ratio, temperature on the silver recovery rate were systematically studied. The optimum technical condition was obtained as follows： Na2 S2 O4/Ag^＋= 2. 5, 35℃, pH 7.5 with a stirring speed 300 r/min. With this technical process, the silver recovery rate can reach to 99.98%. The recovered silver powders were characterized by X -ray diffraction （XRD）, X - ray fluorescence electron diffraction （XRF）, （SAED） transmission electron microscopy （TEM） and the corresponding selected area . They are chain - spherical with mean diameters of 175.8 nm and high purl-ty .

关 键 词：冶金技术 超细银粉 回收 化学还原法 电镀银废液 

分 类 号：TF111.3[冶金工程—冶金物理化学]