A regeneration and recovery method of an electrochemical acidic etching solution used for printed circuit boards

Abstract

The invention discloses a regeneration and recovery method of an electrochemical acidic etching solution used for printed circuit boards, and belongs to the field of electrochemical metal copper recovery. The acidic etching solution is added into an electrolytic tank. The electrolytic tank is divided into a cathode chamber and an anode chamber through an ion separating membrane. A metal copper plate is adopted as a cathode in the cathode chamber. A substrate to be etched is adopted as an anode in the anode chamber. Electrochemical treatment is performed according to following parameters, wherein the etching solution adopted comprises 50-70 g/L of copper (II) sulfate pentahydrate and sulfuric acid having a concentration of 10-11%, the etching reacting temperature is 25-35 DEG C, and an adopted etching current density is 3-10 A/dm<2>. The method can regenerate and recover the acidic etching solution, cam recover the metal copper synchronously, greatly reduces the agent cost of a PCB etching process, effectively shortens a recovery period and increases the production efficiency.

Description

technical field [0001] The invention relates to a method for regeneration and recovery of an electrochemical acid etching solution for printed circuit boards, belonging to the field of electrochemical metal copper recovery. Background technique [0002] With the development of the PCB industry, the impedance requirements of various wires are getting higher and higher, which inevitably requires stricter control of the width of the wires. However, no matter whether people use acid etching or alkaline etching, there is post-treatment of etching waste liquid. However, after using the traditional etching process to etch the board, PCB board manufacturers often sell the copper-containing waste liquid after etching to the water supply supplier, and they extract copper sulfate from the copper-containing waste liquid, and the refined copper sulfate is then used Manufacturers recycle. Therefore, in the traditional production process, there are two processes, resulting in longer recyc...

AI Technical Summary

Problems solved by technology

[0002] With the development of the PCB industry, the impedance requirements of various wires are getting higher and higher, which inevitably requires stricter control of the width of the wires. However, no matter whether people use acid etching or alkaline etching, there is post-treatment of etching waste liquid. However, after using the traditional etching process to etch the board, PCB board manufacturers often sell the copper-containing waste liquid after etching to the water supply supplier, and they extract copper sulfate from the copper-containing waste liquid, and the refined copper sulfate is then used Manufacturers recycle

Therefore, in the traditional production process, there are two processes, resulting in longer recycling cycle and lower production efficiency