What is the recovery of printed circuit boards
Mainly: Shen copper, copper plating, copper plating, etching and a variety of printed circuit board pre-treatment process (chemical pretreatment, brush board pretreatment, volcanic ash grinding plate pretreatment, etc.).
It is well known that there are a lot of lead in the production of printed circuit boards, including copper, a very small amount of lead, tin, gold, silver, fluorine, ammonia, organic matter and organic complexes
These are present in the waste, the waste metal in the metal, such as untreated emissions, both caused by a waste and pollute the environment. Therefore, in the PCB production process of waste water treatment and copper and other metal recycling is very meaningful, is an indispensable part of the production of printed circuit boards.
According to 10,000 square meters of double-panel calculation (each side of the copper foil thickness of 35 microns), the waste liquid, waste water in the amount of copper is about 4,500 kilograms, and there are many other heavy metals and precious metals.
Printed circuit board manufacturing technology is a very complex, comprehensive high processing technology. Especially in the wet process, the need to use a lot of water, which has a variety of heavy metal wastewater and organic wastewater discharge, the composition of complex, more difficult to deal with. According to the printed circuit board copper foil utilization rate of 30% to 40% of the calculation, then the waste liquid, the copper content of waste water is considerable.
