【摘要】 本文研究用氯化铜溶液刻蚀和隔膜电解法再生废液两大步骤。在刻蚀过程中,氮化铜刻蚀液中的[Cu⁺]/[Cu²⁺]比值不断升高,活性减小。将活性降低了的刻蚀废液引入隔膜电解槽电解,一价铜离子在阳极上氧化为Cu²⁺,降低了废液中[Cu⁺]/[Cu²⁺]比值,并在阴极上还原沉积出金属铜而减少了废液中的总铜含量,使溶液活性提高而得到再生。与此同时,已获得再生的刻蚀液连续不断地返回到刻蚀槽,从而形成了无排放的闭路循环系统。更多还原

【Abstract】 The technological process described in this paper includes two mainsteps—the etching printing of circuit board with cupric chloride solutionand the membrane-electrolytic regeneration of spent etchant.In the courseof etching,the ratio of [Cu⁺]/[Cu²⁺] in cupric chloride etchant incessantlyrises,and the activity of the etchant decreases.Under this condition,if thespent etchant is led into a membrane-electrolyzer,the cupric ions Cu⁺ wouldincessantly be transformed into cupric ions Cu²⁺ by oxidation on the anode,and the ratio of [Cu⁺]/[Cu²⁺] in the spent etchant is gradually diminished.At the same time the total copper content in the spent solution is also dim-inished as a result of the reduction of Ca⁺ to metal on the cathode.So thespent etchant is regenerated,and the regenerated etchant into the etchingpool as etchant,the undrained closed-cycle system is formed.The conditions for etching and membrane-electrolysis were investigated.The results show that the efficiency of membrane-electrolysis is mainly det-ermined by ions ratio [Cu⁺]/[Cu²⁺] in the catholyte,and the cell voltage isrelated to this ions ratio in the anolyte.Therefore,the ratios [Cu⁺]/[Cu²⁺]in the catholyte and anolyte have to be controlled in the closed-cycle systemfor achieving a good effect in this membrane-electrolysis regeneration process.更多还原