Brown waste liquid treatment device and brown waste liquid treatment method

Abstract

The invention is applicable to the field of waste water treatment, and provides a brown waste liquid treatment device. The brown waste liquid treatment device comprises a storage device for storing brown waste liquid, an electrolyzer used for electrolytic treatment of the brown waste liquid, and a COD (chemical oxygen demand) degradation device for oxidizing the brown waste liquid. The COD degradation device is connected between the storage device and the electrolyzer. The invention further provides a brown waste liquid treatment method. The brown waste liquid treatment device has the advantages that the COD degradation device is used for oxidizing the brown waste liquid before electrolytic treatment, and copper type slow-release agents such as 1H-benzotriazole in the brown waste liquid can be oxidized, so that bright blocky high-quality copper with high purity can be obtained.

Description

technical field [0001] The invention belongs to the field of waste water treatment, and in particular relates to a browning waste liquid treatment device and treatment method. Background technique [0002] With the rapid development of the PCB (printed circuit board) industry, multilayer printed circuit boards have the advantages of small size, high assembly density, and light weight. The market demand has increased rapidly, and its production has also increased. In the PCB production process, browning treatment is a necessary procedure. Browning solution treatment is to form a layer of browning film surface layer on the PCB inner layer to protect the copper substrate. Specifically, it is a chemical copper etching reaction process. As the browning process progresses, the copper ions in the browning solution continue to rise. When the copper ions exceed a certain range, it will cause quality problems such as whitening of the browned copper surface and uneven color. Therefor...

AI Technical Summary

Problems solved by technology

The chemical precipitation method needs to consume a large amount of chemical reagents, the cost is high, and because copper exists in a complex state, it cannot be completely precipitated

In addition, the high energy of evaporation and crystallization is relatively large, which further increases the production cost

Electrolysis is currently a better method for treating browning waste liquid, but when electrolyzing browning waste liquid, the COD (chemical oxygen demand) value in browning waste liquid is relatively high, and the copper corrosion inhibitor in waste liquid, Such as benzotriazole, tolyltriazole, and mercaptobenzothiazole sodium salt will complex with the copper generated by electrolysis, making it difficult for the electrolysis system to electrolyze blocky, bright, high-purity high-quality copper

In addition, during the electrolysis process, the benzotriazole in the browning waste liquid will also form an oily film on the cathode surface of the electrolysis device, which hinders the precipitation of ionic copper on the cathode surface, and at the same time Copper will attach a small amount of organic matter, which will also cause the copper to darken or even black

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