回收铜阳极泥预处理上清液中银的工艺研究

Silver Recovery from the Supernatant Produced during Copper Anode Slime Pretreatment

采用碘化钠沉银-硫化钠转型-硝酸转型工艺回收铜阳极泥预处理上清液中的银,确定了最佳工艺条件。沉银率最高可达96.56%,沉银后液银含量降至4 mg/L;粗银粉纯度达95%以上。

The silver in the supernatant,produced from copper anode slime pretreatment is recovered by silver precipitation with NaI-transformation with Na2 S and then HNO3. And the optimal process conditions are determined. The results show that the silver recovery canreach 96.56% ,the silver content in the precipitated Ag solution is reduced down to 4 mg/L and the purity of crude silver is above 95%.