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• Cupric Chloride Etchant Electrolytic Recovery System
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Spent Roughening Etchant Processing System

Unique Barrel-Type Electrolyzer for Spent Etchant from Copper Surface Chemical Roughening.

This system enables the processing of the spent roughening etchant, containing copper sulfate and hydrogen peroxide, and the recovery of highly pure metal copper pellets by electrolytic method.

• Spent etchant can be processed in the factory.
• Processing costs of the spent etchant are reduced.
• Copper pellets after electrowinning are easily handled.
• Barrel-type electrolyzer enables the recovery of highly pure metal copper pellets.
• Operation management of the system is easy.

Barrel electrolyzer, which is the main part of this processing system is unique equipment adapting the principle of barrel plating. Copper ion in the spent etchant was recovered as metal copper on the cathode pellets in the rotating barrel.

The only manual work that must be performed is to unload the recovered copper pellets while operating the system. Barrel electrolyzer can prevention of bad smell and keep clean of work environment because it has the structure, which can be exhausted completely gas and mist.

The main processes are hydrogen peroxide removal process and electrolytic process. First, hydrogen peroxide is removed from the spent etchant by heating.Some COD constituents in the spent etchant are also decomposed at this time. Next, copper ions in the spent etchant are deposited as copper metal. At the same time, COD constituents are decomposed. Copper concentration, which remains in the solution after electrolysis process can be decreased to hundreds of ppm order.

Specification (Amount of copper recovery 2kg/h)

Unit	Composition	Size and ratings
Barrel electrolyzer	Amount of copper recovery 0.5kg/h×4	L 7,000×D 4,000×H 3,500(Max)
Solution tank	Capacity 4m3 x 1 / 0.5m3 x 1
Hydrogen peroxide removal tank	Capacity 4m3 x 1	L 3,000 x D 2,500 x H 3,300(Max)
Rectifer	4	1000A x 10V L 450 x D 600 x H 1,000(Max)
Operation board	1	L 1,700 x D 400 x H 1,950(Max)

Applications

Processing of the spent etchant containing copper and recovery of the copper discharged at a printed circuit board factory and a plating factory.