从蚀刻废液中隔膜电沉积金属Cu板新工艺研究

以铜始极片为阴极、石墨板为阳极,在有以阳离子交换膜为隔膜的电解槽中,从酸性CuCl2蚀刻废液电沉积金属铜板。研究了阴极液中起始Cu2+浓度、起始Cl-浓度、阴极电流密度、电解温度和极距等因素对电沉积的影响。最佳条件为:起始Cl-浓度5.5 mol/L,起始H+浓度3.0 mol/L,添加剂0.2g/L,阴极电流密度350 A/m2,电解温度36℃,极距5 cm,Cu2+浓度从40 g/L降低至20 g/L。在最佳工艺条件下,阴极电流效率达到92.77%,平均槽电压小于3 V;阴极上可以得到平整致密的金属铜板。阴极电解废液中的Cu2+浓度降低到20 g/L左右,可返回蚀刻过程配制蚀刻新液。

Study on Electrowinning Sheet-form Copper from Acidic Etchant Waste in Diaphragm Cell

Copper-starting-sheet cathode and graphite anode were adapted to electrowin sheet-form metallic copper from acidic cupric chloride etchant waste in diaphragm cell with cation exchange membrane.The effects of initial Cu2+ and Cl-concentration in cathode compartment,cathodic current density,bath temperature and distance on electrowinning process were investigated.The optimal conditions were obtained including initial Cl-concentration of 5.5 mol/L,initial H+ concentration of 3.0 mol/L,additives of 0.2 g/L,cath...