Acid etching solution recycling regeneration system and method

Abstract

The invention discloses an acid etching solution recycling regeneration method. The acid etching solution recycling regeneration method comprises following steps that (1) an acid etching solution recycling regeneration system is prefabricated; (2) an etching waste solution produced by an etching production line is stored in a waste solution barrel, and the etching waste solution in the waste solution barrel is added into an ionic membrane electrolysis circulation device in an automatic detection adding mode; (3) a regenerated solution and elemental copper are produced in the mode that the etching waste solution is electrolyzed by the ionic membrane electrolysis circulating device, the regenerated solution is stored in a regenerated solution barrel, and the elemental copper is removed out in the form of a copper plate; and (4) an oxidant, hydrochloric acid and the regenerated solution stored in the regenerated solution barrel are correspondingly added into a regenerated solution dispensing monitoring device, the regenerated solution is tested and dispensed by a plurality of detectors in the regenerated solution dispensing monitoring device, the redox potential range of the regenerated solution is between 480 mv and 520 mv, the copper concentration is within the range of 30-60 g / L, and then the regenerated solution flows back into the etching production line to be used. The invention further discloses an acid etching solution recycling regeneration system for implementing 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...

AI Technical Summary

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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