Microetching waste liquor regeneration and recovery system

Abstract

The invention discloses a microetching waste liquor regeneration and recovery system. The system comprises an etching tank and a waste liquor storage tank communicated with the etching tank, the waste liquor storage tank is connected with a central two-stage system which is communicated with a regeneration liquor adjusting tank, the regeneration liquor adjusting tank is connected with a regeneration liquor storage tank which is communicated with the etching tank, water pumps are arranged between the etching tank and the waste liquor storage tank, between the waste liquor storage tank and the central two-stage system, between the central two-stage system and the regeneration liquor adjusting tank, between the regeneration liquor adjusting tank and the waste liquor storage tank as well as between the waste liquor storage tank and the etching tank and are simultaneously connected with a PLC (programmable logic controller) control system, and the etching tank, the central two-stage system and the regeneration liquor adjusting tank are simultaneously connected with the PLC control system. The recovery system is simple in principle, brings direct economic benefit and is high in copper recovery efficiency, reutilization of microetching liquor is achieved, cost is saved, cylinder changing time of a production line is shortened, production efficiency is improved, environmental protection pressure of factories is relieved, and social image of enterprises is improved.

Description

technical field [0001] The invention relates to a recycling system, in particular to a micro-etching waste liquid recycling system for treating micro-etch waste liquid discharged from a (PCB) printed circuit board factory. Background technique [0002] The typical process of printed circuit board (PCB) processing adopts the "pattern plating method". That is to pre-plate a layer of lead-tin corrosion layer on the copper foil part that needs to be reserved on the outer layer of the board (the graphic part of the circuit), and then chemically corrode the rest of the copper foil, which is called etching. PCB etching is divided into two types: alkaline and acidic, one is hydrochloric acid hydrogen peroxide system (acidic); the other is ammonium chloride ammonia water system (alkaline). Alkaline etching solution is mainly suitable for the etching of graphic electroplating metal resist layers, such as printed boards plated with gold, nickel, tin-lead alloy, tin-nickel alloy and ti...

AI Technical Summary

Problems solved by technology

Compared with the etching waste liquid, the copper content of this kind of micro-etching waste liquid is lower (the copper content of the micro-etch waste liquid is 15-35g / L, and the copper content of the etching waste liquid is 150g / L), the recycling value is small, and there is no special The company recycles, and some small PCB companies directly discharge it, which seriously pollutes the environment. Larger PCB companies include it in the wastewater system, using traditional methods such as neutralization and replacement methods, and directly discharge it after disposal. However, such methods It will consume a large amount of chemical raw materials such as acid and alkali, which often causes secondary pollution. At the same time, the recycling of copper is incomplete, and a large amount of metal copper with high economic value is wasted. Moreover, when PCB companies change cylinders, the production progress is seriously affected and manpower is wasted. and material resources, which are not in line with the resource-saving circular economy industrial policy

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