Concentration and extraction of chemical additives

Chemical material concentration and purification

1 Application industry scope

Concentrate coatings and electrophoretic paints

Refined and concentrated electroplating solution

Nanofiltration powder washing and purification

● Catalyst recovery

II Coatings, electroplating, electrophoretic coating

Coating, electroplating, and electrophoretic coating are the processes of immersing an object in an electrophoretic tank and applying paint through electrophoretic deposition. During the production process, coating particles are suspended in the liquid and electrically controlled on top of them. Under high voltage direct current, the above paint particles move to the workpiece immersed in the electrophoretic tank and deposit on the surface of the workpiece, forming a corrosion-resistant and wear-resistant paint layer. Then, the workpiece is repeatedly rinsed several times, and the rinsing water flows back to the main paint tank.

Kaimo Company provides the above-mentioned coating production lineUF, EDRO, and anodeProcessing technology

Ultrafiltration-UFIt is to remove excess rinsing water from the electrophoresis tank, balance the chemical composition in electrophoresis, and ensure the normal operation of the electrophoresis coating process.

EDRO-The electrophoretic reverse osmosis system uses water to supplement the insufficient ultrafiltration water, and the ultrafiltration permeate provides the final rinse water for electrophoretic coating.

Yang level system-The anode unit is an important component in cathodic electrophoretic coating, and excessive acid is released during the deposition process. It must be removed at a stable rate to ensure the chemical balance of the paint solution. The anode tube (membrane electrode) removes acid through a positively charged anionic (selective) membrane located inside the anode tube. There is an electrode (anode) inside the anode tube, which is supplied with high voltage direct current to make the work electrically painted (cathode). The schematic diagram of the combination of EDUF and EDRO is shown in the following figure:

III Refined and concentrated electroplating solution

Electroplated nickel, copper, trivalent chromium, gold, silver and other processes are the main methods for coloring product surfaces. During the process, a large amount of rinsing water is required, and the original process is directly discharged into the sewage treatment plant for physical and chemical treatment, resulting in a large amount of precious metal ions being discharged into water bodies and high environmental treatment costs for enterprises. Electroplating solution refining and concentration device, also known as coloring refining device in the surface treatment industry. The coloring refining device uses a stainless steel pump to pump the electroplating coloring nickel bath solution into a multi-stage filtration system. At the end, the purified water in the plating solution is concentrated and extracted by a special acid and alkali resistant and ultra-high pressure membrane separation system, and directly flows back to float the plated parts, thereby reducing or even eliminating the need for pure water in the coloring process cleaning process. At the same time, the circulation process continuously filters the bath solution by side flow, purifying dust, impurities, and additives in the plating bath mother liquor, making the surface processes of aluminum profiles, hardware, and other materials less colorful and beautifulWidely used in the following industries:

1. Zero discharge of electroplating wastewater: online circulation, direct recycling, with a utilization rate of ≥ 90%.

2. PCB、 Electronic components: online circulation, adding secondary process desalination 5-18M Ω pure water, with a utilization rate of ≥ 80%.

3. Coating surface treatment: online circulation, direct recycling, with a utilization rate of ≥ 90%.

This process recovers and recycles coating and electroplating wastewater, enabling enterprises to achieve zero emission goals in energy conservation, emission reduction, and recycling. It provides a "green" solution for the treatment of electroplating coloring and rinsing water in enterprises. The specific introduction is as follows:

4 Washing and purification of nano powder

The preparation of nano ultrafine powders is still mainly produced by chemical methods in domestic industrialization. After the powder synthesis reaction is completed, various ions will remain in the solution. If not cleaned thoroughly, it will have a serious impact on the quality of ultrafine powder products. Currently, ceramic membranes are used“Cross flow filtering technology”Washing, recovery and concentration of ultrafine powder has become a new application direction, which not only effectively avoids the shortcomings of traditional processes and improves work efficiency, but also can realize continuous clean production, reduce labor intensity, improve product quality and yield. The process flow and characteristics of inorganic membrane used for washing and concentration of nano powder are as follows:

1. High separation accuracy: High powder retention rate, effectively removing impurity ions from the slurry, stable treatment effect, and no change in membrane retention performance during long-term operation;

2. Improve product quality: effectively increase the yield and purity of the target product, with almost no loss of ultrafine powder particles;

3. High product purity: Fully enclosed pipeline operation, using non polluting materials, clear and transparent through liquid, without any secondary pollution to the system;

4. Significant emission reduction effect: requires less water washing, can save more than 30% of cleaning water;

5. Low cost of use: Advanced membrane making technology makes the membrane surface less prone to fouling, with strong membrane regeneration ability and long service life;

6. Long service life: It has excellent properties such as strong resistance to hard particle erosion, acid and alkali resistance, and strong oxidants;

7. Reduce labor costs: With a high degree of automation, individual units are controlled by PLC and HMI;

5 Recovery of Cuihua agent

In petrochemical and chemical production, catalysts are widely used, and it is generally necessary to separate the products and catalysts after the reaction. Due to its excellent heat resistance, chemical solvent resistance, and mechanical strength, inorganic ceramic membranes have shown outstanding advantages in catalyst recovery in petrochemical and chemical production, and have been applied in multiple manufacturers. Unlike traditional settling, plate and frame filtration, and centrifugal separation, ceramic membranes mainly use cross flow filtration in the solid-liquid separation of catalysts and reaction products. The separated liquid needs to be continuously circulated on the circulation side, and the membrane surface can intercept the molecular sieve catalyst while allowing the reaction products to permeate through the membrane pores. Due to the parallel flow of fluid to the surface of the filter medium, the filtration resistance is greatly reduced, allowing for a high permeate flux to be maintained at lower pressures. This enables the filtration operation to be carried out continuously for a longer period of time, resulting in a higher level of catalyst solid content in the concentrated solution.