Method and device for on-line regeneration treatment of metal etching waste liquid

Abstract

The invention discloses a method for on-line regeneration treatment of metal etching waste liquid, which comprises the following steps: Step 1: After filtering the etching waste liquid produced in a metal etching production line through an electroplating filter, it is sent to a waste liquid treatment regeneration tank for electrolytic catalysis; Step 2. Send the regenerated etching solution in the waste liquid treatment regeneration tank to the water ejector to force the absorption of Cl 2 , the absorbed regenerated etching solution flows back into the waste liquid treatment regeneration tank, and repeats continuously; step 3, returns the treated regenerated etching solution to the metal etching production line through overflow, and controls the ORP value of the metal etching solution and current density to control the acidity and specific gravity of the metal etching solution. The invention can achieve the purposes of reducing the discharge of waste liquid, reducing external transportation, reducing the addition of oxidants and other agents while protecting the environment, and reducing production costs.

Description

technical field [0001] The invention relates to the field of metal etching, in particular to a process method for on-line regeneration treatment of metal etching waste liquid and a special device thereof. Background technique [0002] In the construction of the national economy, the metal etching industry has also developed rapidly, but a large amount of metal etching waste liquid will be produced in the production process, which is the same as the copper etching waste liquid produced in the PCB production process. Difficult to handle and dispose of liquid waste. [0003] At present, in the PCB production process, there is already a mature method for regenerating and reusing copper etching waste liquid. However, for metal etching waste liquid, there is no regeneration process in China at present, which is still a blank. In the past, various manufacturers added water to the metal etching waste liquid to dilute it, added alkali to increase the pH value, and then discharged i...

AI Technical Summary

Problems solved by technology

Although this treatment method avoids certain safety and environmental protection issues; however, this treatment of waste liquid not only wastes resources, but also increases the production cost sharply, which increases the burden on the enterprise. risks of

Therefore, it is very necessary to develop a process method capable of electrolytic regeneration and treatment. However, due to the strong acidity of the metal etching waste liquid, the requirements for the material of the plate are very high, and it is difficult to recycle iron. In addition, the metal etching waste liquid It contains a large amount of metal impurities, which brings many difficulties to the process of electrolysis and regeneration treatment. Compared with it, it feels that the value of regenerating metal etching waste liquid is not very great. The above factors have led to the production enterprises' research and development of regeneration technology. Nobody cares

Images