A method and system for recycling acidic etching solution

Abstract

The invention provides an acid etching liquid regenerative cycle method. The method comprises the steps of collection of acid etching liquid, filtration and mixing of the acid etching liquid, ultrasonic-assisted electrolysis, copper sheet decomposition, anolyte cycle using and the like. According to the acid etching liquid regenerative cycle method, ultrasonic catalyzed electrolysis is adopted, the concentration of the acid etching electrolyte, the electrolytic current density and electrolytic temperature are precisely adjusted and controlled, copper ions in the acid etching liquid can be converted to be copper sheets with the purity reaching up to 99%, the separation-out speed of the copper ions is greatly improved, production efficiency is improved, and meanwhile production energy consumption is lowered. The invention further provides an acid etching liquid regenerative cycle system matched with the acid etching liquid regenerative cycle method. The ultrasonic technology is combined with the ion film technology, the copper ion separation-out speed can be increased, the copper ion separation-out purity can be further improved, and the high-purity copper sheets with the purity being 99.8% or above can be obtained.

Description

technical field [0001] The invention relates to the technical field of waste liquid recovery, in particular to a recycling method and system for acidic etching liquid regeneration. Background technique [0002] According to statistics, the average daily amount of waste etching solution produced by PCB manufacturers in my country is more than 6,000 tons. If it can be recycled properly, about 200,000 tons of copper can be recycled every year, which can generate benefits of more than 10 billion yuan in addition to reducing environmental pressure. [0003] With the development of PCB boards from single-sided to double-sided, and then to multi-layer rapidly, a variety of etchant appeared during this period. Due to the higher and higher requirements for etching precision, the pressure of environmental protection is increasing year by year. Up to now, most PCB manufacturers have chosen to use acidic or alkaline copper chloride etching solution. The main components of the acidic c...

AI Technical Summary

Problems solved by technology

Although there have been related processes for electrolytic copper extraction by etching solution, there are the following problems: 1. The efficiency of electrolytic copper extraction is low and the energy consumption is large; 2. It is only pure electrolytic copper extraction, and the etching solution cannot be recycled.

However, the running time of the system is long, a cycle is about 20 to 100 hours, and the recovery efficiency of copper sheets is low

[0005] The Chinese patent application with the publication number CN104630825A discloses an "acid etching solution electrolytic copper extraction device and its process", which can repeatedly extract copper from the etching solution and recycle the etching solution, and the efficiency of multiple electrolytic copper extraction is high At the same time, the recycling rate of etching solution is high, and the problems of high energy consumption and low recycling rate in the electrolytic copper extraction of acid etching solution in the prior art are solved, which not only improves the quality of cathode copper, but also reduces material waste and improves recycling rate

However, due to the practical multiple electrolytic copper extraction of this device, the energy consumption is still very large, and more chlorine gas will be generated after multiple electrolytic copper extractions, which increases the risk of polluting the environment. The concentration of copper ions is getting lower and lower, and the electrolysis power increases in time, and the amount of pure copper precipitated is also extremely rare, which often results in half the effort.

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