A method and system for recycling and regenerating acidic etching waste liquid with zero discharge

Abstract

The invention discloses a zero-discharge acidic etching waste liquid circulation regeneration method and system, which adopts acid concentration technology and tail gas recovery and reuse technology, effectively solves the metal copper in the waste liquid and makes the etching liquid regenerate and reuse, without waste liquid increase The device system includes etching solution treatment system, regeneration solution circulation system, liquid distribution system and chlorine recovery system. The etching solution treatment system includes etching production line (1), mother liquor storage tank (2), electrolyzer and The dissolution absorption system (6), the electrolytic cell includes the cathode cell (3) and the anode cell (5), the regeneration liquid circulation system includes the regeneration liquid storage tank (10) and the regeneration liquid treatment system (11), the method includes electrolysis, chlorine gas treatment And regeneration liquid treatment and other steps. The beneficial effects of the invention are: the system is used for treating waste acidic etching liquid, can extract metal copper, and has the advantages of off-line production, cost saving, resource saving, and the ability to prevent environmental pollution.

Description

technical field [0001] The invention relates to a waste liquid treatment system, in particular to a zero-discharge acidic etching waste liquid recycling method and system. Background technique [0002] Acid etching solution is an etching solution used in the production of fine lines of printed circuit boards and the inner layer of multilayer boards. With the rapid development of the modern electronics industry, the number of circuit board manufacturers has increased rapidly. The industrial wastewater of such enterprises has serious environmental pollution, and the content of copper ions in such industrial wastewater is very high. Therefore, the wastewater and waste liquid produced by circuit board manufacturers The serious environmental pollution and waste of resources caused by it have attracted more and more attention from the society. In order to avoid waste and protect the environment, it is necessary to recycle the acid etching solution. [0003] The regeneration of t...

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Problems solved by technology

However, the total copper continues to increase, and eventually a part of the acidic etching solution needs to be excluded to maintain a certain total copper concentration, which not only pollutes the environment, but also causes a lot of waste of copper and acid; the electrochemical regeneration method is an online regeneration method. Metal copper with commercial value can be produced through electrolysis, but at the same time, chlorine gas is produced to form polluting tail gas, which not only pollutes the environment but also causes waste

[0004] The Chinese patent application number is 201020567155.0, which discloses a regeneration system for acidic etching solution containing copper ions. The exhaust gas treatment device inside the system consumes the chlorine element inside the system. Although it achieves environmental protection, it leads to waste of resources and the loss of chlorine element inside the system. It is necessary to add additional acid to ensure the efficiency of the etching solution.

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