Alkaline etching solution and alkaline etching solution in-situ electrolysis copper extraction recycling device and method

Abstract

The invention provides an alkaline etching solution and an alkaline etching solution in-situ electrolysis copper extraction recycling device and method. Excellent etching stability, etching speed, fineness and high copper ion concentration which is 180-200 g/L are achieved, and the dosage of etching chemical liquid is saved; a simple and controllable etching solution in-situ electrolysis recyclingmode is achieved, a smooth and bright high-purity copper plate is obtained, no electrolysis tail liquid needs deep environmental protection treatment, a blending pot for carrying out manual intervention regenerated liquid blending is not needed, and the alkaline etching solution can directly return to an etching machine for etching circuit board production.

Description

Technical field [0001] The present invention is in the field of alkaline etching circuit boards, and more particularly to apparatus and method for an alkaline etching solution and its recycling in situ electrolytic copper extraction. Background technique [0002] Circuit board manufacturing process of alkaline etching using an alkaline etching sub is a rich source of ammonium chloride solution and ammonia ions of the etched copper foil on the copper clad laminate (copper ammonia complex reaction) form lines, while generating a alkaline etching solution containing copper seed copper rich copper chloride, ammonium chloride, ammonium ion component of the complex. Conventional alkaline etching process with an alkaline solution by the etching sub 250-280g / L of ammonium chloride, 100-120g / L of ammonia, 600-650g / L of water was formed 140-160g / L of copper ion-containing etching CCL , 250-280g / L of ammonium chloride, 100-120g / L of ammonia, alkali etching solution 440-460g / L ...

AI Technical Summary

Problems solved by technology

The whole electrolytic copper extraction process can only work intermittently, not continuously

The composition of the etching regeneration solution after electrolysis is unstable, and the recycling and reuse of the etching regeneration solution has a high quality risk. It needs to be manually mixed with a mixing tank before returning to the production line for continued use. It is easy to cause poor etching lines and unqualified line accuracy during circuit board etching production. question

The electrolytic copper extraction equipment has high power consumption and high heat release, and it also needs auxiliary facilities such as circulating cylinders, cooling systems, ammonia waste gas collection systems, and blending cylinders. The equipment occupies a large area, the system is complex, and the system is difficult to operate safely.

[0007] In order to overcome the problem of the stability and slow speed of etching quality in the regeneration and recycling of etching solution, and improve the service life of etching regeneration solution, Shenzhen Jiechi Technology Co., Ltd. CN200910238823.7 mentioned a regeneration solution of alkaline copper etching solution and The method for increasing its etching speed is to add an organic thio compound containing the NH2-CS-NH-group of the first accelerating agent and the second accelerating agent during the preparation of the regeneration solution of the alkaline copper etching solution. The second accelerating agent is at least one substance selected from the compound of chlorite ion and the compound of perborate ion

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