Low Copper Content Wastewater Discharge Reduction Equipment

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.

3.2 Main Specifications

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