Method for preparing basic bluestone by utilizing PCB ammonium persulfate-H2SO4 micro-etched waste liquid

Abstract

The invention discloses a method for preparing basic bluestone by utilizing PCB ammonium persulfate-H2SO4 micro-etched waste liquid. The method comprises the following steps of: (1) preheating ammonium persulfate-H2SO4 micro-etched waste liquid and basic solution to the temperature of between 50 and 100 DEG C respectively, and adding the preheated micro-etched waste liquid into a neutralizing reaction kettle with a stirring device; (2) gradually adding the basic solution into the micro-etched waste liquid with the stirring for neutralization reaction, and controlling the pH value in the neutralizing reaction kettle to be between 8.0 and 13.0; (3) after filtering precipitate, adding dispersant into filtrate; (4) transferring the filtrate of which the pH value is regulated to an ammonia evaporation reaction kettle for atmospheric distillation to ensure that ammonia escapes from the reaction kettle till the pH value is reduced to be between 7.5 and 8.5, and completing ammonia evaporation; and (5) filtering, washing, drying and sifting basic bluestone precipitate in the material to obtain a crystal-type basic bluestone product. The method has the advantages of efficiently recycling copper resource and contributing to generating high-purity basic bluestone, along with simple whole process equipment, easily controlled operating conditions, and less equipment investment.

Description

Technical field: [0001] The present invention relates to a kind of using PCB ammonium persulfate-H 2 SO 4 The invention relates to a method for producing basic copper sulfate from micro-etching waste liquid, which belongs to the fine chemical industry field. Background technique: [0002] In the production of printed circuit boards, microetching is required in the pretreatment of many processes, such as porosity (PTH), pattern plating (PP), hot air leveling (HASL) and before coating organic solderability protectant (OSP). Both need to use microetching solution to remove the oxide layer on the copper surface and the microcosmic roughening formed to enhance the bonding force of the subsequent process. At present, there are two general microetching solutions: one is persulfate-H 2 SO 4 system, the other is H 2 o 2 -H 2 SO 4 system. The first system often uses ammonium persulfate-H 2 SO 4 solution. [0003] Ammonium persulfate-H in circuit board factory 2 SO 4 Micro...

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Problems solved by technology

[0003] Ammonium persulfate-H in circuit board factory 2 SO 4 Microetching waste liquid contains Cu 2+ , NH 4 + and H 2 SO 4 , usually discharged to wastewater plants after physical and chemical treatment, and a large amount of copper enters the sludge. Although sludge incineration will convert copper into renewable resources, this method has low recovery efficiency and large energy consumption

In addition, there is a large amount of NH in the wastewater 4 + Ions, discharged into the water body will lead to eutrophication of the water body, reduce the ornamental value of the water body, and the nitrate and nitrite generated by oxidation will affect the growth of aquatic organisms and even human health

[0004] At present, there is an electrolysis method to treat the waste liquid. The principle is to use electrochemistry to convert electrical energy into chemical energy, so that the copper ions in the waste liquid are converted into copper simple substances. This method consumes a lot of electric energy and does not efficiently recycle the waste liquid.

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