During PCB etching, Cu2+ concentration in the etching fluid will increase, reducing etching efficiency. To maintain an optimal etching effect, the Cu2+, CI and PH value need to be kept within a reasonably stable scope. In order to achieve that, additional etching fluid is needed to replace the waste fluid. This system serves that exact purpose. It recycles the waste fluid and discharges it back into the etching fluid tank. The recycling process requires only a small amount of nitrogen, etching salt and additive.
A hi-tech yet environmentally friendly equipment, this closed type recycling system was specially designed for waste etching fluid treatment. An industry leader offering superb performance and long service life, the equipment is free of any waste water, waste gas or solid waste discharge. By regenerating the waste etching fluid, not only do users benefit from substantial economic savings, they also get to do their part in protecting the environment. Connected to the etching machine, this system provides automatic recycling of waste etching fluid and ensures stable provision of etching agent.
The system’s main advantages are as follows:
In the etching process of PCBs, copper ion concentration in the etching fluid will increase gradually, reducing etching efficiency. To ensure optimal etching results, the copper ions (Cu) in the etching fluid have to be kept in redox value and both the chloride ions (Cl-) and acid concentration have to be maintained at a reasonable range. To achieve the above, additional etching fluid needs to be added continuously to replace the waste fluid that has lost its etching ability.
This system utilizes different ion-selective electrodes to recycle copper and regenerate etching fluid. An ionic membrane divides the electrolyzer into 2 parts; cathode chamber and anode chamber. The acidic waste etching fluid, with concentrations of Cu+ higher than Cu2+, serves as the cathode solution while electrolytic copper (Cu+) functions as the anode solution. Oxidation at the anode chamber changes Cu+ to Cu2+ as the recycled fluid re-enter the etching cycle.
Both the anode and cathode plates in the recycling system are either made of or coated with titanium. This design avoids chlorine or hydrogen precipitation during oxidation in the electrolyzer, ensuring an environmentally friendly operation.
The Acidic Etching Fluid Recovery System is a method to recycle and regenerate etching fluid in the Printed Circuit Board (PCB) industry. The system consists of a set of liquid transfer and filtration device, a current controller, a solid-liquid separator and an electrolyzer.
The electrolyzer utilizes the “ionic membrane copper electrolysis process”, where the electrolytic bath is divided into a cathode chamber and an anode chamber by an ion membrane. Both the cathode and anode plates are set-up in respective chambers, connected by the current controller.
All tanks in the electrolyzer are linked with pipes and form a closed loop. Under the effect of the plates, electrolysis commences as soon as the waste fluid enters the electrolyzer. Precipitation of copper occurs in the cathode chamber, which through the filtration device became recycled copper. Meanwhile, the fluid will enter the mixing tank for reuse. This system reduces copper ions and meets the objective of etching solution regeneration and copper recovery.
The Acidic Etching Recovery System is a set of fully enclosed, high-tech and environmental friendly system free of waste water, waste gas or waste product discharge. Connected to the etching machine, the system works on an automatic cycle, ensuring stable etching result while it recycles the waste etching fluid. Offering superior performance and long life span, the system can help your company make significant cost savings.
The system’s main advantages are as follows:
We would be delighted to share with you what our products and services can do for you.
