Acid etching liquid recycling system and method thereof

Abstract

The invention discloses an acid etching liquid recycling method which comprises the following steps of (1) prefabricating an acid etching liquid recycling system; (2) storing a waste etching liquor produced by an etching production line in a waste liquor barrel, and adding the waste etching liquor in the waste liquor barrel into an ion-exchange membrane electrolysis circulating device through an automatic-detection adding method; (3) electrolyzing the waste etching liquor through the ion-exchange membrane electrolysis circulating device so as to produce recycled liquid and elemental copper, storing the recycled liquid in a recycled liquid barrel, and moving out the elemental copper as a copper plate; and (4) adding an oxidizing agent, hydrochloric acid and the recycled liquid stored in therecycled liquid barrel into a recycled liquid blending monitoring device, detecting and blending the recycled liquid through multiple detectors in the recycled liquid blending monitoring device, enabling the oxidation reduction potential range of the recycled liquid to range from 480 to 520mv, enabling the copper concentration to range from 30 to 60g / L, and reflowing the recycled liquid into an etching production line so as to use. The invention further discloses an acid etching liquid recycling system applying the method.

Description

technical field [0001] The invention relates to the technical field of etching, in particular to an acid etching solution circulation regeneration system and a method thereof. Background technique [0002] In the past 20 years, China's PCB industry has maintained an annual growth rate of 10-00%. At present, there are more than 3,500 PCB companies of various sizes, with a monthly 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, about 2-3 liters of etching solution is consumed for each square meter of double-sided panels with a normal thickness (18 μm), and Generate 2-3 liters of waste etching solution. my country's PCB industry consumes more than 60,000 tons of refined copper per month, and the total amount of copper in the copper etching waste liquid produced is more than 50,000 tons / m...

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Problems solved by technology

[0004] Therefore, related technologies for the recycling and utilization of waste etching solution have appeared on the market. However, the current technology still has the phenomenon of waste liquid discharge, which cannot achieve the effect of complete recycling and zero discharge.

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