Protect the environment pcb circuit board factory incumbent
Pcb circuit board manufacturing technology is a very complex and highly comprehensive processing technology. Especially in the wet processing process, a large amount of water is used, so a variety of heavy metal wastewater and organic wastewater are discharged, the components are complex, and the treatment is difficult. Calculated according to the utilization rate of printed circuit board copper foil is 30% ~ 40%, then the copper content in waste liquid and wastewater is quite considerable. Calculated based on 10,000 square meters of double-sided panels (the thickness of copper foil on each side is 35 microns), the copper content in waste liquid and wastewater will be about 4,500 kg, and there will be many other heavy and precious metals. If these metals in the waste liquid and wastewater are discharged without treatment, it will cause waste and pollute the environment. Therefore, the wastewater treatment and the recovery of copper and other metals in the printed circuit board production process are very meaningful, and they are an indispensable part in the production of printed boards.
As we all know, the waste water in the printed circuit board production process is a large amount of copper, and a very small amount of lead, tin, gold, silver, fluorine, ammonia, organic substances and organic complexes.
As for the process of producing copper wastewater, there are: sinking copper, all-plate electroplating copper, pattern electroplating copper, etching, and various pre-processing steps for printed boards (chemical pre-treatment, brush-plate pre-treatment, volcanic ash grinding board pre-treatment, etc.).
The copper-containing wastewater generated by the above processes can be roughly divided into complex wastewater and non-complex wastewater according to their components. In order to achieve the national wastewater discharge standard, the allowable discharge concentration of copper and its compounds is 1mg / l (calculated as copper), different wastewater treatment methods need to be adopted for different copper-containing wastewater.