PCB industry production process produces a large number of micro-etching liquid, etching liquid, copper nitrate, and other metals containing different concentrations of copper, a high recovery value, and a small amount of copper heavy metals that cannot be reasonably treated by the environment will be present in the discharge wastewater, which will lead to a significant waste of resources on the one hand and to the release of heavy metals into the soil and water sources on the other. We will live in the natural environment and their own health serious pollution and harm. Using titanium anode, electrowinning copper is → by micro-etching solution (Cu2SO4+H2O2) → oxygen breaking electrolyzer (decomposition of H2O2); Alkaline etching solution → extraction process→ copper sulfate + sulfuric acid → electrowinning copper; Acid etching solution→ ion membrane electrolysis (electrowinning copper) → tail gas treatment (absorption of chlorine) can extract high-purity electrolytic metal copper to complete secondary recovery.
In recent years, PCB surface treatment processes such as copper immersion (PTH), electroplating, inner layer pretreatment, green oil pretreatment, OSP treatment, and other production lines have used a lot of micro-etching solution, which includes sodium persulfate/sulfuric acid system and hydrogen peroxide/sulfuric acid system. Direct electrolysis, however, damages the anode coating.
During the etching process of the electronic circuit plate (PCB), the copper content in the etching solution gradually increases. Each liter of etching solution should contain 120 to 180 grams of copper and the corresponding amount of etching salts (NH4CI) and ammonia to get the greatest etching effect (NH3). The extraction method and direct electrolysis method are the two main systems that make up the acidic and alkaline etching solution regeneration cycle system. A large amount of post-consumer etching solution that originally needed to be discharged can be reduced and regenerated into a reusable reused etching solution. By doing this, industrial waste is discharged less frequently, production expenses are decreased for recycling, and high-purity copper for electrolysis.
For more information, you can contact our customer service for more information about the application of baoji titanium anode in the etching solution recovery industry.
