Printed circuit board manufacturing technology is a very complex, very high processing technology. Especially in the wet milling process, required the use of large quantities of water, thus a variety of heavy metals and organic wastewater discharges, complex, difficult. For 30%~40% on the utilization rate of printed circuit board copper foil is calculated, then the copper content in the waste liquid, waste is considerable. Calculated according to the 10,000 square meter two-panel (copper thickness of 35 µm per side), the copper content in the waste liquid, waste water has about 4500 kg, and there are a lot of other heavy metals and precious metals. These exist in the waste liquid, waste metals, such as untreated discharges, causing both the waste and pollution of the environment. Therefore, in the PCB manufacturing process of wastewater treatment and recovery of metals such as copper are of great significance, is an indispensable part in PCB production.
Printed circuit board manufacturing technology
- Sep 23, 2015-