扩散渗析-电沉积联合工艺资源回收酸性含铜树脂脱附液

摘要

The main components of an acidic resin regenerant containing Cu2+ ions from the electroplating industry have been analyzed.The resources in the resin regenarant could be recovered separately by the joint application of diffusion dialysis (DD) and electrodeposition(ED),and the operating parameters were optimized.It was found that the acid recovery could reach 80.2％ and H+ concentration was 1.12 mol/L when the flow rate was 0.6 L/h and the flow rate ratio was 1.0 (the H+ concentration was 1.2 mol/L,and the Cu2+ concentration was 1.5 mol/L in the acidic resin regenerant).The recovered acid can be reused in the next resin regeneration,while the DD raffinate could be further treated by the ED method to recover Cu.Using the optimized parameters of 9 V voltage,300 min reaction time,and pH 2.5 of the raffinate,the copper recovery,the current efficiency,and the copper purity could reach 98.2％,46.2％,and 98.9％,respectively.This integrated DD-ED strategy can be applied to recover other heavy metal resources from industrial acidic raffinates.%分析了酸性含铜树脂脱附液的组成特征,成功开发了扩散渗析-电沉积联合工艺分步回收酸性含铜树脂脱附液中的酸和铜.研究结果表明,当扩散渗析装置料液流量为0.6 L/h,自来水与酸性含铜树脂脱附液流量比为1.0时,回收酸中H+浓度约为1.12 mol/L,酸回收率为80.2％(废液中H+浓度为1.2 mol/L,Cu2+浓度为0.16 mol/L),可返回树脂再生系统作为脱附剂回用;扩散渗析残液中铜离子平均浓度为0.12 mol/L,调节pH至2.5后进入电沉积装置,当电沉积反应停留时间为300 min,槽电压为9V时,电流效率平均为46.2％,铜回收率可达到98.2％,回收铜纯度为98.9％.开发的扩散渗析-电沉积联合工艺还可以推广应用于其他行业含重金属酸性废液的资源回收.