化学还原法回收含银电镀废液中的银  

Recovery of Silver from Silver-containing Electroplating Effluent by Chemical Reduction Method

作　　者：江成军[1] 张振忠[1] 赵芳霞[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：《化工环保》2010年第1期69-71,共3页Environmental Protection of Chemical Industry

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)

摘　　要：以Na2S2O4为还原剂,采用化学还原法回收某电镀厂含银电镀废液中的银。实验结果表明,在n(Na2S2O4)∶n(Ag+)=2.5、反应温度35℃、废水pH7.5、搅拌速率300r/min的条件下,Ag+回收率达到99.92%。对回收的银粉进行X射线衍射和扫描电子显微镜分析,分析结果表明回收的银粉纯度较高,成球形。Silver was recovered from the silver-containing electroplating effluent which were got from an electroplating plant by chemical reduction method. The experimental results show that under the conditions of n(Na2S2O4):n(Ag+)=2.5,reaction temperature 35 ℃,effluent pH 7.5 and stirring speed 300 r/min,the Ag+ recovery rate can reach 99.92%. The analytical results by XRD and SEM show that the recovered silver powders have a high purity and are in the form of balls.

关 键 词：银 电镀废液 化学还原法 亚硫酸钠 回收 

分 类 号：X781.1[环境科学与工程—环境工程]