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

An acid etching solution, printed circuit board technology, applied in optics, electrolysis process, electrolysis components, etc., can solve the problems of post-processing of etching waste liquid, longer regeneration recovery cycle, low production efficiency, etc., to shorten the recovery cycle, reduce The effect of reducing the cost of chemicals and cleaning costs

Inactive Publication Date: 2016-11-30
GUANGDONG CHENGDE ELECTRONICS TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] A method for regeneration and recovery of electrochemical acid etching solution for printed circuit boards, comprising the following steps:

[0020] 1) The acidic etching solution is introduced into the electrolytic cell. The electrolytic cell is divided into a cathode chamber and an anode chamber by an ion diaphragm. There are several cathode chambers, and each cathode chamber is connected in parallel with each other. The metal copper plate is used as the cathode in the cathode chamber, and the anode chamber The substrate to be etched is used as the anode, the etching solution used includes copper sulfate pentahydrate with a concentration of 50g / L, and sulfuric acid with a concentration of 10%, the etching reaction temperature is 25°C, and the etching current density used is 3A / dm 2 , wherein the size of the metal copper plate used is 75cm×350cm, and the ion separator used is an anion exchange membrane;

[0021] 2) After starting the etching, the acidic etching solutio...

Embodiment 2

[0026] A method for regeneration and recovery of electrochemical acid etching solution for printed circuit boards, comprising the following steps:

[0027] 1) The acidic etching solution is introduced into the electrolytic cell. The electrolytic cell is divided into a cathode chamber and an anode chamber by an ion diaphragm. There are several cathode chambers, and each cathode chamber is connected in parallel with each other. The metal copper plate is used as the cathode in the cathode chamber, and the anode chamber The substrate to be etched is used as the anode, the etching solution used includes copper sulfate pentahydrate with a concentration of 60g / L, sulfuric acid with a concentration of 10.5%, the etching reaction temperature is 30°C, and the etching current density used is 6.5A / dm 2 , wherein the size of the metal copper plate used is 75cm×350cm, and the ion separator used is an anion exchange membrane;

[0028] 2) After starting the etching, the acidic etching solutio...

Embodiment 3

[0030] A method for regeneration and recovery of electrochemical acid etching solution for printed circuit boards, comprising the following steps:

[0031] 1) The acidic etching solution is introduced into the electrolytic cell. The electrolytic cell is divided into a cathode chamber and an anode chamber by an ion diaphragm. There are several cathode chambers, and each cathode chamber is connected in parallel with each other. The metal copper plate is used as the cathode in the cathode chamber, and the anode chamber The substrate to be etched is used as the anode, the etching solution used includes copper sulfate pentahydrate with a concentration of 70g / L, sulfuric acid with a concentration of 11%, the etching reaction temperature is 35°C, and the etching current density used is 10A / dm 2 , wherein the size of the metal copper plate used is 75cm×350cm, and the ion separator used is an anion exchange membrane;

[0032] 2) After starting the etching, the acidic etching solution p...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25F7/02C25F3/02C25C1/12
CPCC25C1/12C25F3/02C25F7/02Y02P10/20
Inventor 吴子坚程静林灿荣张卫
Owner GUANGDONG CHENGDE ELECTRONICS TECH CO LTD
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