In electroplating industry, copper-containing wastewater is mainly from acidic etching waste, the main ingredient of acid etching waste is copper chloride, hydrogen chloride, chlorinated ammonia or sodium chloride.
The treatment technology of copper-containing wastewater in acid etching waste water is the same as that of all pollutants in electroplating wastewater.
First, the processing technology mainly includes:
1. Chemical method
2. Redox method
3. Ion Exchange method
4. Electrolysis method
5. Membrane separation method.
The basic principle of electrolysis is that when the current passes through the electrolyte solution, the cation in the solution produces the ion migration and the electrode reaction, i.e. the cation in the waste water migrates to the cathode and produces a reduction reaction on the cathode to make the metal deposition.In recent years, the experimental research can also be used to treat the waste water of cyanide copper plating and pyrophosphate plating.
|System category||Coating type|
|Micro Etching Solution||Titanium based Iridium Tantalum|
|Alkaline Etching Solution||Titanium Iridium tantalum/lead dioxide|
|Acid Etching Solution||Titanium based ruthenium Iridium|
Current density: (200-400) a/m2
A. Micro-Etching solution (CU2SO4+H2O2) → Oxygen-breaking electrolyzer (decomposition of H2O2) → Electrowinning copper
B. Alkaline etching solution → extraction process → cupric sulfate + sulfuric acid → electrowinning copper
C. Acid etching solution → ion membrane electrolysis (copper) → tail gas treatment (absorption of chlorine)
Titanium anode for copper recovery of electroplating wastewater using iridium tantalum mixed metal oxide coating, platinum iridium tantalum mixed metal oxide coating, platinum layer, etc., can be based on customer plating trough size, electroplating conditions of different specifications of copper recycling anode plate.