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...

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Problems solved by technology

Existing methods for the recovery and treatment of etching waste liquid include: the electrolytic treatment method described in the invention patent CN102206823A, the disadvantage of which is that the process is complex and the investment is large; the solvent extraction method is to add the extractant to the alkaline etching waste liquid To obtain a copper-containing solution and an etching regeneration solution, the disadvantage of this method is that an expensive extraction agent needs to be used, and the process is cumbersome; and a method for purifying copper by reduction, for example, the method for purifying copper by reducing it with hydrazine hydrate as described in the invention patent CN102019430A , the disadvantage of this method is that the process control is complicated and the cost is high; the ammonium chloride after neutralization of the etching wastewater is crystallized by using the evaporation crystallization method, which has high energy consumption and slow speed