Circuit board acid-base etching waste liquid recycling treatment technology

Abstract

The invention discloses a circuit board acid-base etching waste liquid recycling treatment technology. Acidic etching waste liquid and alkaline etching waste liquid are neutralized to generate copperoxychloride, copper oxychloride reacts with an alkaline solution to generate copper oxide, copper oxide reacts with concentrated sulfuric acid to generate copper sulfate, and filtrate and washing water in the reactions are collected. The circuit board acid-base etching waste liquid recycling treatment technology makes copper ions precipitate to generate different copper-containing products througha plurality of steps, operation is easy, the cost is low, etching waste liquid ca be treated on a large scale, meanwhile, the treated filtrate is sufficiently utilized to prepare etching liquid again, the economic benefit is enhanced, emission is reduced, and environmental protection is facilitated.

Description

technical field

[0001] The application belongs to the technical field of waste liquid recovery, in particular, it relates to a recovery and treatment process for acid-base etching waste liquid containing circuit boards. Background technique

[0002] With the rapid development of the electronics industry, the output of printed circuit boards is also increasing year by year. In the etching process of manufacturing printed circuit boards, a large amount of alkaline etching solution or acidic etching solution is required. After these etching solutions are used, they form etching waste liquid, which contains a large amount of copper ions and ions such as chloride ions that can be reused to configure the etching liquid. Existing methods for the recovery and treatment of etching waste liquid include: the electrolytic treatment method as described in the invention patent CN102206823A, the disadvantage of this method is that the process is complex and the investment is large; the sol...

Examples

Embodiment Construction

[0016] A number of implementations of the present application will be disclosed below, and for the sake of clarity, many practical details will be described together in the following description. It should be understood, however, that these practical details should not be used to limit the application. That is to say, in some embodiments of the present application, these practical details are unnecessary.

[0017] First, the acidic etching waste liquid and the alkaline etching waste liquid are stored in the acidic storage tank and the alkaline storage tank respectively. Since cuprous ions are easily oxidized into copper ions in an alkaline environment, and easily exist in an acidic condition, the first Detect whether cuprous ions are contained in the acidic etching waste liquid, and if cuprous ions are detected, add an oxidizing agent to the acidic etching waste liquid to oxidize the cuprous ions into copper ions. Because cuprous ions are difficult to form copper precipitates...

technical field

[0001] The application belongs to the technical field of waste liquid recovery, in particular, it relates to a recovery and treatment process for acid-base etching waste liquid containing circuit boards. Background technique

[0002] With the rapid development of the electronics industry, the output of printed circuit boards is also increasing year by year. In the etching process of manufacturing printed circuit boards, a large amount of alkaline etching solution or acidic etching solution is required. After these etching solutions are used, they form etching waste liquid, which contains a large amount of copper ions and ions such as chloride ions that can be reused to configure the etching liquid. Existing methods for the recovery and treatment of etching waste liquid include: the electrolytic treatment method as described in the invention patent CN102206823A, the disadvantage of this method is that the process is complex and the investment is large; the sol...

Examples

Embodiment Construction

[0016] A number of implementations of the present application will be disclosed below, and for the sake of clarity, many practical details will be described together in the following description. It should be understood, however, that these practical details should not be used to limit the application. That is to say, in some embodiments of the present application, these practical details are unnecessary.

[0017] First, the acidic etching waste liquid and the alkaline etching waste liquid are stored in the acidic storage tank and the alkaline storage tank respectively. Since cuprous ions are easily oxidized into copper ions in an alkaline environment, and easily exist in an acidic condition, the first Detect whether cuprous ions are contained in the acidic etching waste liquid, and if cuprous ions are detected, add an oxidizing agent to the acidic etching waste liquid to oxidize the cuprous ions into copper ions. Because cuprous ions are difficult to form copper precipitates...