A kind of recycling method of copper-containing industrial waste liquid

Abstract

The invention provides a copper-containing industrial waste liquid recycling method; an alkaline waste liquid and an acidic copper-containing waste liquid in printed circuit boards are selected as raw liquids, and a two-step pH value adjustment process having pre-sedimentation is adopted, so that high-concentration organic matters can be more effectively removed, so as to achieve a better purifying treatment effect. Moreover, in the process of two times of sedimentation treatments, a treatment temperature is gradually increased, so that re-aggregation of decomposed organic matter particles can be effectively avoided so as to avoid an adsorbing effect from being affected. At different stages of sedimentation, flocculation sedimentation materials with different properties and parameters are targetedly selected and used, and thus the more effective organic matter removal effect is obtained. The pH value of sedimentation is reasonably set, so as to be more beneficial to decomposition of the organic matters. A special acidic solution is used for adjusting the pH value so as to obtain a better organic matter decomposition adsorption effect. The organic matters are further decomposed by adding an appropriate amount of hydrogen peroxide, so as to better make the organic matters adsorbed and settled.

Description

technical field [0001] The invention relates to a treatment process for industrial waste liquid, in particular to a recycling method for copper-containing industrial waste liquid. Background technique [0002] In recent years, with the rapid development of my country's electronics industry, the manufacturing consumption of circuit board products as the basis of the electronics industry has also increased sharply. As of 2005, my country has become the world's largest production base of printed circuit boards, and there are a large number of The printed circuit boards of electronic products will be produced and assembled in my country, and the annual output of PCBs exceeds 200 million m 3 . [0003] Among them, in the preparation process of printed circuit boards, the etching process is a very important process, which is widely used in processes such as black / brown oxidation, PTH plated through holes, full-board copper plating, and line copper plating. will produce a large am...

AI Technical Summary

Problems solved by technology

If such a high-concentration copper ion waste liquid is not treated, it is bound to cause very serious harm to the ecological environment, especially water resources.

[0004] Not only that, the waste liquid with a high content of heavy metals in the production process of printed circuit boards originally has a strong recycling value. Elements, etc. are difficult to meet the standards stably, and it is difficult to play the role of recovering valuable metals, and the treatment methods and equipment that can effectively recover valuable imports and exports are extremely expensive

Therefore, enterprises often use the traditional chemical coagulation and sedimentation method to react the heavy metals in the waste liquid to form sludge and then implement waste landfill. Some unscrupulous manufacturers even directly discharge the heavy metal waste liquid into the river regardless of the life and death of the surrounding people. As a result, it not only causes serious pollution to the environment, but also causes the heavy metals in the waste liquid to not be effectively recovered, resulting in a waste of resources and an increase in the cost of printed circuit boards.

[0005] In addition, these copper or other heavy metal waste liquids of printed circuit boards usually have high COD (chemical oxygen demand) and BOD (biochemical oxygen demand), which requires a very complicated waste liquid treatment system and high treatment costs. Moreover, even if a large amount of water is used for dilution after treatment, COD, etc. are still difficult to reach the standard