1. No pollution, acid can be reused. 2. can obtain min. 99.5% purity electro-deposit copper plates.
1. Technical Introduction
It is designed for spent low copper content solution range in 5g/l-50g/l which is produced from tank replacement and tank washing for procedures such as black oxide line and internal layer pretreatment, solder dam pretreatment, chemistry nickel gold and silver line, copper reduction line, horizontal line and OSP, etc. It adopts new technique of direct electro-deposition to obtain min. 99.5% purity electro-deposit copper plates. The copper content of treated solution is reduced to 0.5 g/L which can be used for acidification of spent stripping and developing solution in PCB plant.
2. Application Scope
It is applied to comprehensive copper-containing solution produced in PCB plant, copper electro-plating plant and copper smelting plant.
3. Equipment Introduction
3.1 Work Flow
Spent solution is pumped into electro bath where begin to electro-deposit after additives automatically been added and mixed evenly. Electrolytic copper obtained at cathode after copper ion been deposited and small amount chlorine produced from anode will be discharged after alkaline sprinkle treatment through sweep gas spray tower. The spent copper solution is continuously electrodeposited till concentration of copper is lower than 0.5g/L. Treated solution eventually will be delivered to wastewater treatment station or be used for acidification of spent stripping and developing solution treatment.
Add Chemicals |
Sweep Gas |
Emission |
Electrolytic bath |
Circulating Cooling Bath |
Copper |
Sink |
Sweep Gas Spray Tower |
Raffinate |
Acidizing Spent Stripping and Developing Solution |
Models | RLC-01 | RLC-05 | RLC-10 | RLC-20 |
Process Capacity (L/D) | 1600 | 8000 | 16000 | 32000 |
Power(kw) | 6 | 30 | 60 | 120 |
Work Floor(m2) | 5 | 35 | 70 | 140 |
Operator(s) | 1 | 3 | 5 | 7 |
Electricity Consumption(kw.h/t) | <5000 | |||
Copper Recovery Rate | >95% | |||
Note: Copper content is considered as 10 g/L.
4. Environmental-protection Standards
4.1 Exhaust gas emission reaches National Environmental Protection Standards: exhaust gas is discharged after treatment, no odor.
4.2 Spent electro-deposition solution is treated before discharge.
5. Features and Advantages
The copper content of low copper content wastewater usually is 10 g/L. Traditional treatment processes such as neutralization-precipitation and cathode electro-deposition only can obtain low added value products. Here are the effects of different processes as following:
Index | Neutralization-precipitation | Traditional Electrolysis Technique | VARY's Electrolysis Technique |
Final Product | Copper mud | Copper particles, high water contained | Copper plates, no water contained |
Product Purity | 5%~20% | 78%~82% | >99.5% |
Efficiency | - | 60%~75% | 80%~90% |
Electricity Consumption for One Ton Copper Production | - | 6000~8000 kW.h | 5000 kW.h |
Labor Intensity | High, to clean up copper mud | High | Low |
Price of Final Product | Very low | Low | High |
Effect to Environment | Secondary pollution easily | Pollution, washing water discharged | No pollution, acid can be reused. |
Low Copper Content Wastewater Discharge Reduction Equipment
