Abstract

A technology for removing toxic Cd²⁺ from electroplating process electrolytes and washwater containing \({\text{SO}}_{4}^{{2 - }}\) or Cl^– is proposed. This technology makes it possible to decrease the concentration of Cd²⁺ in treated solutions to 0.1–0.07 g/L and the Cd²⁺ ingress into plant waste waters by 288–366 times and attain a Cd²⁺ recovery of 99.7%. Electrolysis in a dual-chamber cell with an anion-exchange membrane makes it possible to return Cd and a H₂SO₄ solution back into the process. The removal of Cd²⁺ from Cl^– containing solutions is recommended to be performed by membrane electrolysis, separating the insoluble anode with a chemically stable cation-exchange membrane to prevent the migration of Cl^– from the catholyte into the anolyte and, correspondingly, their oxidation on the insoluble anode with the liberation of toxic Cl₂.

中文翻译：

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膜和无膜电解净化镉离子电镀废水的技术。

摘要

提出了一种从电镀工艺电解液和含\（{{text {SO}} _ {4} ^ {{{2-}} \}}或Cl ^–的洗涤水中去除有毒Cd ^2+的技术。这项技术可以将处理后的溶液中Cd ²⁺的浓度降低至0.1-0.07 g / L，并将Cd ²⁺进入植物废水的能力提高288-366倍，并实现99.7％的Cd ²⁺回收率。在带有阴离子交换膜的双室电解槽中进行电解可以使Cd和H ₂ SO ₄溶液返回到该过程中。从Cl中去除Cd ^{2+的方法–}含有溶液建议通过膜电解进行，用化学稳定的阳离子交换膜分离的不溶性阳极，以防止氯的迁移^-从阴极到阳极液和，相应地，其上具有解放不溶性阳极氧化有毒的Cl ₂。