In the copper foil production process, one of the first stages is to dissolve high-grade (recycled) copper in Sulfuric Acid (H2S04)(1). This solution is then pumped through filters to produce the desired copper electrolyte solution and remove impurities. The last stage is a storage tank, where the solution is kept before it is fed to the actual plating process to create copper foil(2).
On the side of this storage tank, in a recirculated bypass on the side of the storage tank, both concentrations (Cu + H2SO4) are monitored, which is a critical measurement in the production process of copper foil. When the solution meets all chemical and quality standards, the solution is pumped into large plating tanks containing partially immersed titanium drums to create a thin film of very pure copper. These are also referred to as electroplating (ED) machines(3).