In the PCB manufacturing process, wastewater containing precious metals is primarily generated in processes involving plating, deposition, and other steps where precious metals are used.
Precious Metal Wastewater Recovery System
Release time：28 September 2024Precious Metals Wastewater Sources
| Process | Precious Metals Contained | Waste Liquid Source | Waste Liquid Characteristics |
| Electroplating (Gold, Silver, Palladium Plating) | Gold (Au), Silver (Ag), Palladium (Pd), etc. | During the electroplating of gold, silver, palladium, etc., the rinsing steps and changes of the electroplating bath solution generate wastewater containing these precious metals. This wastewater contains precious metal ions, surfactants, and other chemicals used in the electroplating process. | It contains precious metal ions, typically with some level of acidity or alkalinity, requiring specialized precious metal recovery treatment.
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| Chemical Plating | Gold (Au), Silver (Ag), Palladium (Pd), etc. | In the chemical plating process, precious metals are deposited on the PCB surface via chemical reduction, generating wastewater containing precious metals, especially during the rinsing and replacement of the plating solution.
| It contains a high concentration of precious metal ions and may include reducing agents and other auxiliary chemicals.
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| Immersion Gold, Immersion Silver, Immersion Palladium Processes | Gold (Au), Silver (Ag), Palladium (Pd). | Immersion gold, immersion silver, and immersion palladium processes are used to deposit precious metals onto the conductive parts of PCBs, such as electrical contact points. Rinsing water and spent plating solutions from these processes contain precious metals. | It contains precious metal ions and other electroplating chemicals, with high concentrations of precious metals, requiring recovery treatment for reuse. |
| Deposition Removal/Stripping (Tin/Nickel Stripping) | In some stripping processes, there may be gold (Au) or silver (Ag). | Stripping processes are used to remove previously deposited layers or coatings on the PCB surface. During the removal of gold, silver, or palladium coatings, stripping solution and rinsing water may contain precious metals. | It contains precious metals and chemical agents used for stripping, such as acidic or alkaline solutions. |
| Etching Wastewater (Silver-related) | Silver (Ag). | In some PCB manufacturing processes that use silver conductive materials, etching wastewater may contain silver. For example, in silver paste printing or silver conductor preparation processes, etching solution and rinsing water may contain silver. | It contains silver ions and other etchants, such as chlorides or acidic solutions. |
| Rinse Water from Precious Metal Processing | Gold (Au), Silver (Ag), Palladium (Pd). | After plating or depositing precious metals, PCBs need to be rinsed to remove surface residues. This rinse water may also contain some concentration of precious metals. | It contains residual precious metals, typically in low concentrations, but due to the large volume of wastewater, the cumulative amount of precious metals can be significant. |
In PCB manufacturing, precious metal wastewater is primarily generated in electroplating, chemical plating, immersion gold/silver/palladium processes, and stripping. The precious metals in wastewater mainly include gold, silver, and palladium. These wastewater streams pose environmental risks and have economic value, so specialized recovery processes are often used to extract and reuse precious metals, preventing waste and pollution.
Precious Metal Wastewater Recovery System
The precious metal wastewater recovery system is designed to efficiently extract and recycle valuable metals such as gold, silver, and palladium from wastewater generated during industrial processes, particularly in sectors like PCB (Printed Circuit Board) manufacturing. This system plays a crucial role in reducing environmental pollution, conserving resources, and saving operational costs. This system is essential for industries looking to implement sustainable practices while maintaining operational efficiency.
Precious Metal Wastewater Recovery Process
PCB or electroplating enterprise production process of chemical gold line, electric gold line and other processes generated by the waste gold liquid or gold washing wastewater, which has a higher gold content of the waste gold cylinder liquid and the first washing wastewater containing gold content of about 0.1 to 0.2 g / liter, and the second and third washing in the content of 0.3 to 3 mg / liter. Our company through the design of “electrolysis + resin adsorption” linkage equipment for high concentration and low concentration of wastewater gold recovery respectively, using the principle of metal electrodeposition to high purity monomer gold recovery of high concentration of gold-containing wastewater, special resin adsorption recovery of low concentration of gold-containing wastewater, and then discharged wastewater gold content of less than 0.1 mg / liter, to achieve the maximum recovery of precious metals. The recovery of precious metals is maximized.
System Features
- The equipment uses a rotary cathode, high-frequency pulse intelligent electrolytic recovery, does not add any chemical reagents, and only uses a small amount of power (150-250W) without secondary pollution concerns.
- The equipment is compact and compact, easy to operate, do not need special care; Full anti-corrosion design, long service life; Large treatment capacity, after combination, the monthly treatment of silver-containing wastewater can be more than 6 0 0 0 -18 0 0 0 0, gold-containing wastewater treatment capacity halved.
- The recovery rate reaches more than 99%, and can directly extract the purity of 95-99.8% of gold.
- The content of precious metals in the waste liquid after treatment: silver can be lower than 5-20ppm, gold can be lower than 2-10ppm.
- The equipment does not need any consumables and the electrolytic accelerator, operation, and maintenance cost is very low.
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