Abstract

An electrochemical method for the neutralization, disposal, and regeneration of sulfuric acid solutions of copper etching used in the production of printed circuit boards has been proposed. The possibility of the electrochemical regeneration of sulfuric acid solutions of a copper etching containing H₂O₂ or \({{{\text{S}}}_{{\text{2}}}}{\text{O}}_{{\text{8}}}^{{{\text{2}} - }}\) oxidizer is investigated. Membraneless electrolysis is suitable exclusively for the disposal of spent solutions by removing residues of the H₂O₂ or \({{{\text{S}}}_{{\text{2}}}}{\text{O}}_{{\text{8}}}^{{{\text{2}} - }}\) oxidizing agents and toxic Cu²⁺ from spent solutions with a minimum power consumption of 3.88 (kW h)/(kg Cu). The possibilities of membrane electrolysis in a two-chamber cell are limited by the removal of Cu²⁺ and with the possibility of creating conditions for the synthesis of \({{{\text{S}}}_{{\text{2}}}}{\text{O}}_{{\text{8}}}^{{{\text{2}} - }},\) while the regeneration of the H₂O₂ oxidant is impossible. Electrolysis in a three-chamber cell with two ion-exchange membranes has great functionality, as it allows one to simultaneously remove Cu²⁺ with a fraction of the current carried by Cu²⁺ up to 9.7%, preserve the H₂O₂ oxidizer, or synthesize a \({{{\text{S}}}_{{\text{2}}}}{\text{O}}_{{\text{8}}}^{{{\text{2}} - }}\) oxidizer with a current efficiency of up to 42.6% (in the absence of special additives).

中文翻译：

---

膜和无膜电解生产印刷电路板中硫铜蚀刻溶液的再生和处理的理论和实践基础

摘要

已经提出了一种用于中和，处理和再生在印刷电路板生产中使用的铜蚀刻的硫酸溶液的电化学方法。包含H ₂ O ₂或\（{{{\ text {S}}} __ {{\ text {2}}}} {\ text {O}}的铜蚀刻液中硫酸溶液的电化学再生可能性研究了_ {{\ text {8}}} ^ {{{{text {2}}-}} \）氧化剂。无膜电解通过去除H ₂ O ₂或\（{{{\ text {S}}} _ {{\ text {2}}}} {\ text {O}的残留物，专门适用于处理废液。} _ {{\ text {8}}} ^ {{{{text {2}}-}} \）氧化剂和有毒的Cu ²⁺废溶液的最低能耗为3.88（kW h）/（kg Cu）。两腔室电池中膜电解的可能性受到Cu ²⁺的去除的限制，并且可能为合成\（{{{\ text {S}}} _ {{\ text {2 }}}} {\ text {O}} _ {{\ text {8}}} ^ {{{\ text {2}}-}}，\），而H ₂ O ₂氧化剂的再生是不可能的。在具有两个离子交换膜的三室电解槽中的电解具有强大的功能，因为它允许人们同时去除Cu ²⁺，而一部分Cu ²⁺携带的电流高达9.7％，从而保留了H ₂ O ₂氧化剂，或合成一个\（{{{\ text {S}}} _ {{\ text {2}}}} {\ text {O}} _ {{\ text {8}}} ^ {{{\ text {2}} -}} \）氧化剂，电流效率高达42.6％（在没有特殊添加剂的情况下）。