Solutions for comprehensive reuse of heavy metal wastewater in the PCB industry

Solutions for comprehensive reuse of heavy metal wastewater in the PCB industry

In the whole process of PCB production, there are many processes that will produce a large amount of heavy metal wastewater. Typical examples are acid etching waste liquid, alkaline etching waste liquid, micro-corrosion waste liquid, low-copper waste water, nitric acid deplating water, and deplating water. Tin wastewater, browning wastewater, template water, electroplating wastewater, gold-containing wastewater, nickel-containing wastewater, etc. After six years of continuous R&D investment, ONESEINE TECHNOLOGY has broken through many technical bottlenecks in the industry, realized the extraction of a variety of heavy metals and the recycling and reuse of three acids and two alkalis, and adopted an innovative BOO model. Honghua Environmental Protection provides customers free of charge. Provide the whole plant and the whole process of heavy metal wastewater resource reuse solutions, technology, equipment and later operation services, so that the waste liquid produced can be recycled and reused online, which not only greatly saves the production cost and waste liquid treatment cost of the industry, but also The metal proceeds extracted from it are also shared by both parties. The specific information of the company's main products is as follows:

1. On-line recycling system for acid etching solution

Using self-developed membrane separation technology, it can complete the reuse of acid etching solution and copper recovery, so as to achieve the long-term recycling of etching solution and the goal of 100% copper recovery rate, while keeping production costs to a minimum. It is mainly used to treat high copper acid waste liquid discharged by related enterprises such as printed circuit board factories and electroplating factories. Its technical advantages mainly include:

1) Adopting unique membrane separation technology, no need to add extraction agent or additional chemical reagents, to ensure high-quality chemical liquid reuse, etching factor ﹥3, etching circuit CPK﹥1.35.

2) Efficient regeneration ability of etching solution, saving 90% of oxidant and 70% of hydrochloric acid.

3) The industry has the lowest energy consumption, and the deposition power consumption is less than 3500kw.h/ton copper.

4) System authorized patent number: ZL201220423840.5.

2. Alkaline etching solution recycling system

Designed for the alkaline etching waste liquid generated in the production of PCB printed circuit board factories, the system adopts advanced closed self-circulation and parallel non-destructive separation technology for the separation of metal copper and the reuse of etching liquid. The technological process achieves the long-term recycling of the solution and the goal of 100% copper recovery rate, while keeping the production and operation costs to a minimum. The system is connected to the etching machine in an online closed loop, and automatically circulates to restore and regenerate the alkaline etching waste liquid, and at the same time recover the copper in the alkaline etching waste liquid. There are no three wastes in the whole process, which is in full compliance with the national environmental protection requirements of clean production, energy saving and emission reduction. Its technical advantages mainly include:

1) High-quality chemical liquid reuse, meeting the minimum line width of 2mil etching in the PCB industry.

2) The etching factor is increased to level 3-5 (generally alkaline etching factor is level 2-3)

3) The industry has the lowest energy consumption, and the electricity consumption per ton of copper is less than 4500 kWh.

4) According to the customer's output situation, realize the equipment standardization and modular configuration.

5) System authorized patent number: ZL201220019622.5.

3. Micro-corrosion waste liquid regeneration and recovery system

In order to treat the micro-corrosion waste liquid discharged from the printed circuit board factory, the company has specially developed a micro-corrosion waste liquid regeneration and recovery system, which can realize 100% recycling of the micro-corrosion waste liquid and 100% extraction of copper, which has no pollution to the environment. The system equipment has remarkable characteristics such as beautiful appearance, low operating cost, reliable sub-liquid preparation and addition system, and high quality of reused solution. Its technical advantages mainly include:

1) The syrup reuse is qualified and stable, with various control indicators CPK﹥1.4.

2) The industry has the lowest energy consumption, and the electricity consumption per ton of copper is less than 3,500 kWh.

3) According to the customer's output situation, realize the equipment standardization and modular configuration.

4) System authorized patent number: ZL201220423429.8.

4. Comprehensive treatment system for low-copper wastewater

Using the two-stage treatment technology of "electrolytic deposition + advanced treatment", after treatment, the concentration of copper ions in the original solution can be reduced to below 0.05g/l, which can be directly discharged into the sewage treatment station, which greatly reduces the difficulty and cost of subsequent treatment. This technology achieves the discharge of low-copper-containing wastewater, and at the same time obtains high value-added products-electrolytic copper products with a purity of 99%. The system is mainly used to treat low-emissions from printed circuit board plants, electroplating plants and other related enterprises. The main technical advantages of copper-containing waste liquid are:

1) Deep electrolytic treatment of wastewater, the total copper content after treatment is the lowest in the industry <0.5g/l, and the color of the discharged water is close to colorless.

2) The industry has the lowest energy consumption, and the electricity consumption per ton of copper is less than 3800 kWh.

3) According to the customer's output situation, realize the equipment standardization and modular configuration.

4) System authorized patent number: ZL201220409383.4.

5. Nitric acid deplating water recycling system

This system uses advanced "membrane separation + electrodeposition" processing technology to reduce the copper ions in the high copper deplating water replaced from the nitric acid deplating tank to high-density electrolytic copper, and at the same time regenerate the nitric acid in the waste liquid. Return to the recycling and reuse of the deplating tank to realize zero pollution of ammonia nitrogen and greatly reduce the environmental protection treatment pressure of the enterprise. Its technical advantages mainly include:

1) The continuous reuse of nitric acid reduces the time for changing tanks on the production line and improves production efficiency.

2) According to the customer's output situation, realize the equipment standardization and modular configuration.

3) System authorized patent number: 201520331252.2

6. Recycling system of stripping tin water

This system adopts a new type of membrane separation technology to recover nitric acid through the "on-line tin stripping water circulation system", introduce it into the mixing tank and reconstitute it as regenerated tin stripping water and return it to the production line for recycling. This system eliminates a large amount of nitric acid from the source And the disposal of waste liquid. In addition, the tin in the waste tin stripping water is extracted through the metal extraction device to achieve "0" discharge of metal tin. It is a completely innovative device system for the recovery and regeneration of tin stripping water and tin extraction. Its technical advantages mainly include:

1) Low-energy and high-efficiency membrane separation technology recovers nitric acid, and the nitric acid recovery rate is over 85%.

2) The metal recovery rate reaches 100%.

3) The energy consumption for each ton of tin extracted is within 3000KW·h.

4) The energy consumption for each ton of nitric acid recovered is less than 200KW·h.

5) The quality of the reused liquid medicine is stable and can be circulated for a long time.

6) System authorized patent number: 201520331251.8

7. Comprehensive treatment system for browning wastewater

Using the technology of "pre-treatment + electrolytic pre-treatment + electrolytic non-destructive separation + electrolytic advanced treatment", the browning copper-containing wastewater is treated into a dilute acid solution with a copper content of less than 0.5g/l, and then discharged into the sewage treatment station, which greatly reduces The subsequent treatment is difficult and costly, and high-purity electrolytic copper can be obtained at the same time, which reduces the pressure of environmental protection treatment. The production process of this system is automatically controlled, and it is very suitable for the current production of the inner layer browning (oxidation) of multilayer circuit boards, including ordinary browning liquid and high-performance special material browning liquid. Its technical advantages mainly include:

1) Basically zero emissions: achieve clean production, energy saving and emission reduction; reduce the environmental pressure of the factory:

2) Reduce the consumption of syrup, so as to reduce the production cost.

3) Produce high-value electrolytic copper, creating economic benefits for the enterprise.

4) The amount of chemicals used in the wastewater plant is greatly reduced, and the total copper removal rate in the discharged wastewater is >99%.

5) The equipment occupies a small area, has a small investment, does not require other auxiliary materials, is simple and easy to operate, and has an electrical efficiency of 70%. The total processing cost is lower than other processes.

8. Formwork water treatment and reuse equipment

Grinding board water treatment and recycling equipment: using high-strength polymer filter materials to achieve 99% recovery of waste water copper particles through high-pressure filtration; at the same time, the recycling of water resources is realized, the waste water treatment cost is minimized, and the nozzles of the grinding brushes are effectively prevented from clogging and Silt in the sink. It is used to treat the waste liquid containing copper particles produced in each stage of the printed circuit board factory, such as the rubbing waste liquid after the inner and outer layers are removed, and the waste liquid before the solder resist printing.

9. Precious metal recycling equipment

The precious metal recovery equipment uses electrodeposition technology to reduce the precious metal ions (such as gold, silver, platinum, nickel, etc.) in the wastewater into high-purity precious metals, while reducing the metal content in the solution to 2~5ppm, achieving considerable economic benefits And environmental benefits. Product uses include:

1) Recovery of silver in the washing water after washing with silver cyanide tank;

2) Recover the gold in the water after washing through the gold tank;

3) Recover the gold in the collected gold water;

4) Recovery of silver in silver cyanide solution;

5) Recover the gold in the gold-copper cyanide tank;

6) Destroy the cyanide in the sodium cyanide tank.