Device and method for cyclic regeneration and copper extraction of etching liquid

Abstract

The invention discloses a device and a method for the cyclic regeneration and copper extraction of etching liquid. The device comprises a waste liquid storage tank, a transit cylinder, a diaphragm electrolytic cell, a regenerated liquid storage tank and a dissolved solution absorption cylinder, wherein the transit cylinder comprises a first cylinder body and a second cylinder body, and the diaphragm electrolytic cell is divided into an anode chamber and a cathode chamber by a diaphragm. The device and method disclosed by the invention have the beneficial effects that by setting the transit cylinder and arranging a forced circulation system between the transit cylinder and the cathode chamber, the electrolytic efficiency of the electrolytic cell is increased, and after copper in waste etching liquid is nondestructively separated, a high-purity copper plate is produced on a negative plate; waste etching liquid after being treated by an etching liquid regenerating cycle system is cyclically utilized, so that new etching liquid is not required to be bought in the process of etching a printed wiring board, thereby saving the production cost, for purchasing etching liquid, of a circuit board production enterprise; the pollution problem caused by waste etching liquid to the environment is solved, and produced gas can be discharged with standard level; and the maximization of economic benefits and environmental benefits is realized.

Description

technical field [0001] The invention relates to the field of etching waste liquid treatment, in particular to a device and method for recycling etching liquid and extracting copper. Background technique [0002] As the foundation of the electronics industry, information industry and home appliance industry, the printed circuit board industry, one of the heavily polluting industries, has been transferred to China in the past 20 years, making China's PCB (printed circuit board) industry maintain a 10-12% growth rate in recent years. Annual growth rate, there are currently more than 5,000 PCB companies of various sizes, with an annual output of 120 million square meters. Etching is a process that consumes a large amount of chemicals and water in PCB production, and it is also the process that produces the largest amount of waste liquid and wastewater. Generally speaking, the consumption of etching liquid per square meter of double-sided panels with a normal thickness (18 μm) is...

AI Technical Summary

Problems solved by technology

According to statistics, transportation losses amount to 3% to 5%, causing pollution to the environment;

[0008] 2) It is necessary to add chemicals to the waste liquid, thus destroying the components of the waste liquid and making it impossible to recycle;

[0009] 3) Copper recovery efficiency is low, product value is low, treatment cost is high, waste water treatment cost is high

[0015] This method consumes a lot of energy in the electrolytic regeneration project, the cost of the ionic membrane (diaphragm) is high and should be damaged, and the chlorine gas produced cannot be completely recovered, which not only causes waste of resources but also pollutes the environment, and even leads to serious safety accidents

The service life of the anode plate is short, the consumption cost is high, and the quality and purity of the copper plate produced from the cathode plate are not high

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