A wastewater treatment system for a circuit board gold plating process

Abstract

The utility model discloses a kind of wastewater treatment systems of circuit board gold sinking technology, including wastewater classification collection component, for classifying storage nickel-containing wastewater, phosphorus-containing wastewater and cyanide-containing wastewater, be set at the most front end of wastewater treatment system, including nickel-containing wastewater tank, phosphorus-containing wastewater tank and cyanide-containing wastewater tank.The utility model realizes the accurate classification storage of nickel-containing, phosphorus-containing, cyanide-containing wastewater by wastewater classification collection component, effectively avoid the chemical reaction caused by wastewater mixing, improve the processing security.Nickel-containing wastewater tank, phosphorus-containing wastewater tank and cyanide-containing wastewater tank cooperate with first solenoid valve and main bus pipe, realize automatic drainage control by control module, reduce manual operation, improve processing efficiency.Inflow pipe is equipped with flow control valve, accurately adjusts wastewater inflow, avoids overflow or equipment overload.

Description

Technical Field

[0001] This utility model relates to the field of wastewater treatment technology, and in particular to a wastewater treatment system for circuit board immersion gold process. Background Technology

[0002] Immersion gold plating is widely used in electronics manufacturing, and its wastewater contains harmful chemical elements such as nickel, phosphorus, and cyanide, posing a significant environmental threat. Current technologies typically employ separate collection and chemical treatment methods for wastewater treatment. For example, CN108862749A discloses an electroplating wastewater treatment system that collects nickel- and phosphorus-containing wastewater in separate tanks, combining sedimentation and filtration to remove pollutants. CN110563216A proposes an automated treatment device that uses pH adjustment and dosing devices to treat cyanide-containing wastewater. These systems connect multiple treatment units through pipelines and are equipped with stirring devices and filtration components, enabling preliminary wastewater separation and pollutant removal, meeting some environmental protection requirements, and providing an effective wastewater treatment solution for the PCB industry.

[0003] However, existing technologies have significant drawbacks. First, the automation level of wastewater classification and collection is low, lacking precise flow control and solenoid valve linkage, which easily leads to wastewater mixing or low treatment efficiency. Second, dosing devices are mostly manual or semi-automatic, making it difficult to dynamically adjust the dosage according to the wastewater pH value, affecting the treatment effect. Furthermore, the deep purification units in existing systems often lack dedicated clean water discharge pipes, resulting in purified water being mixed with sediment during discharge, increasing the difficulty of subsequent treatment. The agitator and filter components lack sufficient corrosion resistance, leading to a short equipment lifespan. Overall, existing technologies have limitations in terms of automation control, treatment accuracy, and equipment durability, making it difficult to meet the demands for efficient and environmentally friendly wastewater treatment. Utility Model Content

[0004] The purpose of this invention is to address the shortcomings of existing technologies by proposing a wastewater treatment system for the immersion gold process of printed circuit boards.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A wastewater treatment system for immersion gold plating process of printed circuit boards includes a wastewater classification and collection component for separately storing nickel-containing wastewater, phosphorus-containing wastewater, and cyanide-containing wastewater, located at the front end of the wastewater treatment system, including nickel-containing wastewater tanks, phosphorus-containing wastewater tanks, and cyanide-containing wastewater tanks; and a pretreatment component for treating the pH value, precipitates, and fine particles of the wastewater, located in the middle section of the wastewater treatment system and connected to the wastewater classification and collection component, including a pH adjustment tank, a sedimentation tank, and a filtration tank, which are sequentially connected by pipelines. The filter tank is equipped with a filtration assembly; a deep purification assembly, used to treat nickel, phosphorus, and cyanide chemical elements in the wastewater, is located at the end of the wastewater treatment system and is connected to the pretreatment assembly, including a nickel-containing treatment tank, a phosphorus-containing treatment tank, and a cyanide-containing treatment tank, each equipped with a dosing device for adding chemical agents; a drive pump, used to pump wastewater from the wastewater classification and collection assembly into the pretreatment assembly; and a control module, electrically connected to the pretreatment assembly and the deep purification assembly, used for automated control of the wastewater treatment process.

[0007] Preferably, the wastewater classification and collection assembly further includes drain pipes installed at the bottom of the nickel-containing wastewater tank, the phosphorus-containing wastewater tank, and the cyanide-containing wastewater tank. A first solenoid valve is installed on the drain pipe. The first solenoid valve is electrically connected to the control module and is used to control the flow of wastewater according to the type of wastewater. The ends of the three drain pipes are connected to the main manifold. The assembly also includes inlet pipes installed at the top of the nickel-containing wastewater tank, the phosphorus-containing wastewater tank, and the cyanide-containing wastewater tank. The inlet pipes are equipped with flow control valves to control the inflow of wastewater.

[0008] Preferably, it also includes a stirring device, which is installed inside the pH adjustment tank and the nickel-containing treatment tank. The stirring device includes stirring blades made of corrosion-resistant material and is installed inside the pH adjustment tank or the nickel-containing treatment tank. A drive shaft is fixedly connected to the bottom of the stirring blades. The drive shaft rotates through the bottom of the pH adjustment tank or the nickel-containing treatment tank and is connected to the power output end of the motor. The motor is electrically connected to the control module through a frequency converter to adjust the stirring speed. The motor is fixed to the bottom of the pH adjustment tank or the nickel-containing treatment tank.

[0009] Preferably, the pretreatment component further includes a second solenoid valve, which is installed on the pipeline connecting the pH adjustment tank, sedimentation tank, and filtration tank, and is electrically connected to the control module; a diversion unit, which includes a diversion pipe connected to the filtration tank, and three diversion branches connected to one side of the diversion pipe, each of which is equipped with a third solenoid valve, which is electrically connected to the control module and controls the opening and closing of the diversion branches according to the wastewater type; the three diversion branches are respectively connected to the nickel-containing treatment tank, the phosphorus-containing treatment tank, and the cyanide-containing treatment tank; a sludge discharge port is opened at the bottom of the sedimentation tank, and a matching plug is installed in the sludge discharge port. The plug is made of corrosion-resistant rubber and is connected by threads or snaps; a pH sensor is installed inside the pH adjustment tank and is electrically connected to the control module to monitor the pH value and adjust the dosage.

[0010] Preferably, the dosing device includes a support plate fixed to the side wall of the nickel-containing treatment tank, phosphorus-containing treatment tank, or cyanide-containing treatment tank. A medicine tank is fixed on the support plate, and an inlet is provided at the top of the medicine tank. The inlet is equipped with a sealing cap. A medicine pump is also provided on the support plate. The medicine pump is a corrosion-resistant peristaltic pump, which is electrically connected to the control module and supports quantitative dosing. The liquid inlet of the medicine pump is connected to the bottom of the medicine tank through a first hose, and the liquid outlet of the medicine pump is connected to a nozzle through a second hose. The nozzle is fixed to the end of the nozzle holder, which is fixed to the inner wall of the nickel-containing treatment tank, phosphorus-containing treatment tank, or cyanide-containing treatment tank.

[0011] Preferably, the deep purification component also includes three water purification pipes, which are respectively installed on the side walls of the nickel-containing treatment tank, the phosphorus-containing treatment tank, and the cyanide-containing treatment tank. The water purification pipes are made of corrosion-resistant PVC.

[0012] Preferably, the system also includes a drive pump, which is a corrosion-resistant centrifugal pump, used to pump wastewater from the wastewater classification and collection component into the pretreatment component. The inlet of the drive pump is connected to the main manifold via a flange, and the outlet of the drive pump is connected to the pH adjustment tank via a pipe. The control module includes a PLC and a touch screen, which are electrically connected to the first solenoid valve, the second solenoid valve, the third solenoid valve, the pH sensor, and the dosing device. The module adjusts the dosage and the on / off state of the solenoid valves according to the pH value monitored by the pH sensor, and is used to automatically control the wastewater treatment process.

[0013] This utility model has the following beneficial effects:

[0014] 1. This utility model achieves precise classification and storage of nickel-, phosphorus-, and cyanide-containing wastewater through a wastewater classification and collection component, effectively avoiding chemical reactions caused by wastewater mixing and improving treatment safety. The nickel-containing, phosphorus-containing, and cyanide-containing wastewater tanks, in conjunction with a first solenoid valve and main manifold, achieve automated drainage control through a control module, reducing manual operation and improving treatment efficiency. The inlet pipe is equipped with a flow control valve to precisely regulate the wastewater inflow, preventing overflow or equipment overload. This modular and automated classification and collection design not only enhances the stability and safety of wastewater treatment but also provides high-quality wastewater input for subsequent pretreatment and deep purification, making it suitable for the actual needs of small and medium-sized electroplating plants.

[0015] 2. The pretreatment and deep purification components of this invention work synergistically, significantly improving wastewater treatment efficiency and pollutant removal rate. The pretreatment component sequentially treats the pH value, suspended solids, and fine particles of the wastewater through a pH adjustment tank, sedimentation tank, and filtration tank. The filtration component uses multi-layer filters to effectively remove impurities. A diversion unit, combined with a third solenoid valve, accurately distributes wastewater to treatment tanks containing nickel, phosphorus, and cyanide. The deep purification component quantitatively adds chemical agents through a dosing device, combined with a stirring device to promote the reaction. Purified water is discharged separately through a purified water drain pipe, reducing the load on subsequent treatments and improving the compliance rate of discharged water quality.

[0016] 3. This invention achieves a high degree of automation and intelligence in wastewater treatment through the integration of a control module and a pH sensor. The control module uses a PLC and a touch screen, and is electrically connected to the first, second, and third solenoid valves, the pH sensor, and the chemical pump. It dynamically adjusts the dosage and solenoid valve operation based on the real-time pH value monitored by the pH sensor, ensuring precise and efficient treatment. The motor of the stirring device has its speed adjusted via a frequency converter to optimize the mixing effect of wastewater and chemicals. The application of corrosion-resistant materials enhances equipment lifespan and reduces maintenance costs. This automated design reduces manual intervention, improves system stability and reliability, and is suitable for long-term operation and complex wastewater treatment scenarios. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of a wastewater treatment system.

[0018] Figure 2 Schematic diagram of the wastewater sorting and collection component;

[0019] Figure 3 This is one of the schematic diagrams of the preprocessing component structure;

[0020] Figure 4 This is the second schematic diagram of the preprocessing component structure;

[0021] Figure 5 for Figure 4 Enlarged schematic diagram of a local structure at point A;

[0022] Figure 6 This is a schematic diagram of the deep purification component structure;

[0023] Figure 7 for Figure 6 Enlarged schematic diagram of the local structure at point B.

[0024] In the diagram: 1. Wastewater sorting and collection assembly; 101. Nickel-containing wastewater tank; 102. Phosphorus-containing wastewater tank; 103. Cyanide-containing wastewater tank; 104. Drainage pipe; 105. First solenoid valve; 106. Main manifold; 107. Inlet pipe; 2. Pretreatment assembly; 201. pH adjustment tank; 202. Sedimentation tank; 203. Filter tank; 204. Agitator blade; 205. Drive shaft; 206. Motor; 207. Sludge discharge port; 208. Plug; 209. Filter cotton plate; 21. 0. Second solenoid valve; 211. Diverter pipe; 212. Diverter branch pipe; 213. Third solenoid valve; 214. pH sensor; 3. Deep purification assembly; 301. Nickel-containing treatment tank; 302. Phosphorus-containing treatment tank; 303. Cyanide-containing treatment tank; 304. Support plate; 305. Medicine tank; 306. Medicine inlet; 307. Medicine pump; 308. First hose; 309. Second hose; 310. Spray head; 311. Spray head bracket; 312. Clean water drain pipe; 4. Drive pump. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0026] Reference Figures 1-7A wastewater treatment system for immersion gold plating process of printed circuit boards includes a wastewater classification and collection component 1 for classifying and storing nickel-containing wastewater, phosphorus-containing wastewater, and cyanide-containing wastewater. This component is located at the front end of the wastewater treatment system and includes a nickel-containing wastewater tank 101, a phosphorus-containing wastewater tank 102, and a cyanide-containing wastewater tank 103. A pretreatment component 2, used to treat the pH value, precipitates, and fine particles of the wastewater, is located in the middle section of the wastewater treatment system and connected to the wastewater classification and collection component 1. This component includes a pH adjustment tank 201, a sedimentation tank 202, and a filtration tank 203, which are sequentially connected by pipes. The filter tank 203 is equipped with a filter assembly 209; the deep purification assembly 3, which is used to treat nickel, phosphorus and cyanide chemical elements in the wastewater, is located at the end of the wastewater treatment system and is connected to the pretreatment assembly 2. It includes a nickel-containing treatment tank 301, a phosphorus-containing treatment tank 302 and a cyanide-containing treatment tank 303. Each of the nickel-containing treatment tank 301, phosphorus-containing treatment tank 302 and cyanide-containing treatment tank 303 is equipped with a dosing device for adding chemical agents; a drive pump 4 is used to pump wastewater from the wastewater classification and collection assembly 1 into the pretreatment assembly 2; and a control module is electrically connected to the pretreatment assembly 2 and the deep purification assembly 3 for automatically controlling the wastewater treatment process.

[0027] In this embodiment, the wastewater classification and collection component 1 enables the separate storage of nickel-containing wastewater tank 101, phosphorus-containing wastewater tank 102, and cyanide-containing wastewater tank 103, avoiding harmful chemical reactions and improving safety. The pretreatment component 2 sequentially adjusts the pH value and removes suspended solids and fine particles through a pH adjustment tank 201, a sedimentation tank 202, and a filtration tank 203. The filtration component 209 ensures the cleanliness of the wastewater. The deep purification component 3 precisely adds chemical agents using the dosing devices in the nickel-containing treatment tank 301, phosphorus-containing treatment tank 302, and cyanide-containing treatment tank 303 to remove pollutants such as nickel, phosphorus, and cyanide. The drive pump 4 efficiently transports the wastewater to the pretreatment component 2, and the control module achieves automated control via electrical connection, improving treatment efficiency and stability, making it suitable for wastewater treatment in circuit board immersion gold processes.

[0028] In this utility model, the wastewater classification and collection component 1 also includes drain pipes 104 disposed at the bottom of the nickel-containing wastewater tank 101, the phosphorus-containing wastewater tank 102, and the cyanide-containing wastewater tank 103. A first solenoid valve 105 is disposed on the drain pipe 104. The first solenoid valve 105 is electrically connected to the control module and is used to control the flow of wastewater according to the type of wastewater. The ends of the three drain pipes 104 are connected to the main manifold 106. It also includes inlet pipes 107 disposed at the top of the nickel-containing wastewater tank 101, the phosphorus-containing wastewater tank 102, and the cyanide-containing wastewater tank 103. The inlet pipe 107 is provided with a flow control valve for controlling the inflow of wastewater.

[0029] In this embodiment, the wastewater sorting and collection component 1 achieves classified storage of wastewater through nickel-containing wastewater tank 101, phosphorus-containing wastewater tank 102, and cyanide-containing wastewater tank 103, effectively preventing mixing reactions and improving treatment safety. Drain pipes 104 are located at the bottom of each tank and equipped with first solenoid valves 105. Through electrical connection with the control module, the drainage flow is precisely controlled according to the wastewater type, ensuring orderly delivery of wastewater to the main manifold 106 and improving automation. The main manifold 106 collects wastewater from the three tanks, optimizing delivery efficiency. Inlet pipes 107 are located at the top of each tank and equipped with flow control valves to precisely regulate the wastewater inflow, preventing overflow or equipment overload. This structural design enhances the accuracy and stability of wastewater sorting and collection, providing high-quality wastewater input for subsequent pretreatment.

[0030] This invention also includes a stirring device, which is installed inside the pH adjustment tank 201 and the nickel-containing treatment tank 301. The stirring device includes a stirring blade 204, which is made of corrosion-resistant material and is installed inside the pH adjustment tank 201 or the nickel-containing treatment tank 301. A drive shaft 205 is fixedly connected to the bottom of the stirring blade 204. The drive shaft 205 rotates through the bottom of the pH adjustment tank 201 or the nickel-containing treatment tank 301 and is connected to the power output end of the motor 206. The motor 206 is electrically connected to the control module through a frequency converter to adjust the stirring speed. The motor 206 is fixed to the bottom of the pH adjustment tank 201 or the nickel-containing treatment tank 301.

[0031] In this embodiment, the stirring device is installed inside the pH adjustment tank 201 and the nickel-containing treatment tank 301. The stirring blades 204, drive shaft 205, and motor 206 achieve uniform mixing of wastewater and reagents, improving reaction efficiency. The stirring blades 204 are made of corrosion-resistant materials such as 316L stainless steel, which withstands acid and alkali environments and extends service life. The stirring blades 204 are fixedly connected to the motor 206 via the drive shaft 205, which passes through the bottom of the pH adjustment tank 201 or the nickel-containing treatment tank 301, ensuring stable transmission. The motor 206 is electrically connected to the control module via a frequency converter, allowing adjustment of the stirring speed according to the wastewater characteristics, optimizing the mixing effect and reducing energy consumption. This device is fixed to the bottom of the tank / vessel, has a compact structure, and enhances the efficiency and stability of the pH adjustment and nickel treatment processes.

[0032] In this invention, the pretreatment component 2 further includes a second solenoid valve 210, which is installed on the pipeline connecting the pH adjustment tank 201, sedimentation tank 202, and filtration tank 203, and is electrically connected to the control module; a diversion unit, which includes a diversion pipe 211 connected to the filtration tank 203, and three diversion branch pipes 212 connected to one side of the diversion pipe 211, each of which is equipped with a third solenoid valve 213, which is electrically connected to the control module. The connection is configured to control the opening and closing of the branch pipes according to the wastewater type. The three branch pipes 212 are respectively connected to the nickel-containing treatment tank 301, the phosphorus-containing treatment tank 302, and the cyanide-containing treatment tank 303. The bottom of the sedimentation tank 202 is provided with a sludge discharge port 207, and a matching plug 208 is installed in the sludge discharge port 207. The plug 208 is made of corrosion-resistant rubber and is connected by threads or snaps. The pH sensor 214 is installed inside the pH adjustment tank 201 and is electrically connected to the control module to monitor the pH value and adjust the dosage.

[0033] In this embodiment, the pretreatment component 2 achieves pH adjustment, suspended solids sedimentation, and fine particle filtration of wastewater through a pH adjustment tank 201, a sedimentation tank 202, and a filtration tank 203, thereby improving wastewater treatment efficiency. A second solenoid valve 210 is installed in the inter-tank pipeline and electrically connected to the control module to precisely control wastewater flow. The diversion unit distributes the filtered wastewater to the nickel-containing treatment tank 301, the phosphorus-containing treatment tank 302, and the cyanide-containing treatment tank 303 through a diversion pipe 211 and three branch pipes 212. A third solenoid valve 213 is electrically connected to the control module and automatically controls its on / off state according to the wastewater type. The sludge discharge port 207 of the sedimentation tank 202 is equipped with a corrosion-resistant rubber plug 208, connected by threads or snaps for easy cleaning. A pH sensor 214 monitors the pH value and is linked to the control module to dynamically adjust the dosage, ensuring treatment accuracy and stability.

[0034] In this utility model, the dosing device includes a support plate 304, which is fixed to the side wall of a nickel-containing treatment tank 301, a phosphorus-containing treatment tank 302, or a cyanide-containing treatment tank 303. A medicine tank 305 is fixed on the support plate 304, and a medicine inlet 306 is provided on the top of the medicine tank 305. The medicine inlet 306 is provided with a sealing cover. A medicine pump 307 is also provided on the support plate 304. The medicine pump 307 is a corrosion-resistant peristaltic pump, which is electrically connected to the control module and supports quantitative dosing. The liquid inlet of the medicine pump 307 is connected to the bottom of the medicine tank 305 through a first hose 308, and the liquid outlet of the medicine pump 307 is connected to a nozzle 310 through a second hose 309. The nozzle 310 is fixed to the end of a nozzle holder 311, which is fixed to the inner wall of the nickel-containing treatment tank 301, the phosphorus-containing treatment tank 302, or the cyanide-containing treatment tank 303.

[0035] In this embodiment, the dosing device achieves precise chemical dosing through a support plate 304, a chemical tank 305, a chemical pump 307, a first hose 308, a second hose 309, a nozzle 310, and a nozzle holder 311, significantly improving the treatment efficiency of the deep purification component 3. The support plate 304 is securely fixed to the side wall of the nickel-containing treatment tank 301, the phosphorus-containing treatment tank 302, or the cyanide-containing treatment tank 303, supporting the chemical tank 305 and the chemical pump 307. The inlet 306 of the chemical tank 305 is equipped with a sealing cap to prevent chemical leakage. The chemical pump 307 is a corrosion-resistant peristaltic pump, electrically connected to the control module, supporting quantitative dosing and ensuring precise chemical dosing. The first hose 308 and the second hose 309 connect the chemical tank 305 to the nozzle 310. The nozzle 310 is fixed to the inner wall of the tank via the nozzle holder 311, achieving uniform spraying and promoting a full reaction between wastewater and the chemical.

[0036] In this utility model, the deep purification component 3 also includes three water purification pipes 312, which are respectively installed on the side walls of the nickel-containing treatment tank 301, the phosphorus-containing treatment tank 302 and the cyanide-containing treatment tank 303. The water purification pipes 312 are made of corrosion-resistant PVC.

[0037] In this embodiment, the deep purification component 3 effectively discharges purified wastewater through three purified water drain pipes 312, significantly improving the discharge efficiency and environmental performance of the wastewater treatment system. The purified water drain pipes 312 are respectively installed on the side walls of the nickel-containing treatment tank 301, the phosphorus-containing treatment tank 302, and the cyanide-containing treatment tank 303, and are made of corrosion-resistant PVC material, which can resist the erosion of acidic and alkaline substances in the wastewater, extending their service life. Each purified water drain pipe 312 is dedicated to discharging the purified water from the treatment tank, clearly distinguishing its function from the drain pipe 104 of the wastewater classification and collection component 1, avoiding the mixing of purified water and sediment during discharge, and reducing the difficulty of subsequent treatment. This design optimizes the deep purification process of nickel-, phosphorus-, and cyanide-containing wastewater, ensuring that the discharged water quality meets standards and is suitable for the environmental requirements of PCB immersion gold processes.

[0038] This invention also includes a drive pump 4, which is a corrosion-resistant centrifugal pump, used to pump wastewater from the wastewater classification and collection component 1 into the pretreatment component 2. The inlet of the drive pump 4 is connected to the main manifold 106 via a flange, and the outlet of the drive pump 4 is connected to the pH adjustment tank 201 via a pipe. The control module includes a PLC and a touch screen, which are electrically connected to the first solenoid valve 105, the second solenoid valve 210, the third solenoid valve 213, the pH sensor 214, and the dosing pump 307 of the dosing device. The module adjusts the dosage and the on / off state of the solenoid valves according to the pH value monitored by the pH sensor 214, and is used to automatically control the wastewater treatment process.

[0039] In this embodiment, the drive pump 4 and control module significantly improve the operating efficiency and stability of the wastewater treatment system through efficient wastewater transport and automated control. The drive pump 4 is a corrosion-resistant centrifugal pump, connected to the main manifold 106 and pH adjustment tank 201 via a flange, ensuring stable transport of wastewater from the wastewater classification and collection component 1 to the pretreatment component 2. The control module uses a PLC and a touchscreen, electrically connected to the first solenoid valve 105, the second solenoid valve 210, the third solenoid valve 213, the pH sensor 214, and the dosing pump 307. It dynamically adjusts the dosage and solenoid valve operation based on the real-time pH value monitored by the pH sensor 214, achieving precise diversion and treatment. This automated design reduces manual intervention, optimizes the wastewater treatment process, and is suitable for the high-efficiency and environmentally friendly requirements of PCB immersion gold processes.

[0040] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A wastewater treatment system for immersion gold plating process of printed circuit boards, characterized in that, include Wastewater sorting and collection assembly (1) is used to sort and store nickel-containing wastewater, phosphorus-containing wastewater and cyanide-containing wastewater. It is set at the front end of the wastewater treatment system and includes a nickel-containing wastewater tank (101), a phosphorus-containing wastewater tank (102) and a cyanide-containing wastewater tank (103). The pretreatment component (2), used to treat the pH value, sediment and fine particles of wastewater, is set in the middle section of the wastewater treatment system and is connected to the wastewater classification and collection component (1). It includes a pH adjustment tank (201), a sedimentation tank (202) and a filter tank (203). The pH adjustment tank (201), the sedimentation tank (202) and the filter tank (203) are connected in sequence by pipes. The filter tank (203) is equipped with a filter component (209). The deep purification component (3), used to treat nickel, phosphorus and cyanide chemical elements in wastewater, is set at the end of the wastewater treatment system and is connected to the pretreatment component (2). It includes a nickel-containing treatment tank (301), a phosphorus-containing treatment tank (302) and a cyanide-containing treatment tank (303). Each of the nickel-containing treatment tank (301), the phosphorus-containing treatment tank (302) and the cyanide-containing treatment tank (303) is equipped with a dosing device for adding chemical agents. Drive pump (4) for pumping wastewater from the wastewater sorting and collection assembly (1) into the pretreatment assembly (2); The control module is electrically connected to the pretreatment component (2) and the deep purification component (3) for automatically controlling the wastewater treatment process.

2. The wastewater treatment system for PCB immersion gold plating process according to claim 1, characterized in that, The wastewater classification and collection assembly (1) further includes drain pipes (104) installed at the bottom of the nickel-containing wastewater tank (101), the phosphorus-containing wastewater tank (102), and the cyanide-containing wastewater tank (103). A first solenoid valve (105) is installed on the drain pipe (104). The first solenoid valve (105) is electrically connected to the control module and is used to control the flow of wastewater according to the type of wastewater. The ends of the three drain pipes (104) are connected to the main manifold (106). The assembly also includes an inlet pipe (107) installed at the top of the nickel-containing wastewater tank (101), the phosphorus-containing wastewater tank (102), and the cyanide-containing wastewater tank (103). The inlet pipe (107) is equipped with a flow control valve to control the inflow of wastewater.

3. The wastewater treatment system for PCB immersion gold plating process according to claim 1, characterized in that, It also includes a stirring device, which is installed inside the pH adjustment tank (201) and the nickel-containing treatment tank (301). The stirring device includes a stirring blade (204), which is made of corrosion-resistant material and is installed inside the pH adjustment tank (201) or the nickel-containing treatment tank (301). A drive shaft (205) is fixedly connected to the bottom of the stirring blade (204). The drive shaft (205) rotates through the bottom of the pH adjustment tank (201) or the nickel-containing treatment tank (301) and is connected to the power output end of a motor (206). The motor (206) is electrically connected to the control module through a frequency converter to adjust the stirring speed. The motor (206) is fixed to the bottom of the pH adjustment tank (201) or the nickel-containing treatment tank (301).

4. The wastewater treatment system for PCB immersion gold plating process according to claim 1, characterized in that, The pretreatment component (2) further includes a second solenoid valve (210), which is installed on the pipeline connecting the pH adjustment tank (201), the sedimentation tank (202) and the filtration tank (203) and is electrically connected to the control module. The diversion unit includes a diversion pipe (211) connected to the filter tank (203). Three diversion branches (212) are connected to one side of the diversion pipe (211). Each of the three diversion branches (212) is equipped with a third solenoid valve (213). The third solenoid valve (213) is electrically connected to the control module and controls the opening and closing of the diversion branches according to the wastewater type. The three diversion branches (212) are respectively connected to the nickel-containing treatment tank (301), the phosphorus-containing treatment tank (302), and the cyanide-containing treatment tank (303). The sedimentation tank (202) has a sludge discharge port (207) at the bottom, and a matching plug (208) is provided in the sludge discharge port (207). The plug (208) is made of corrosion-resistant rubber and is connected by threads or snaps. A pH sensor (214) is installed inside the pH adjustment tank (201) and electrically connected to the control module for monitoring pH value and adjusting dosage.

5. The wastewater treatment system for PCB immersion gold plating process according to claim 1, characterized in that, The dosing device includes a support plate (304) fixed to the side wall of the nickel-containing treatment tank (301), the phosphorus-containing treatment tank (302), or the cyanide-containing treatment tank (303). A medicine tank (305) is fixed on the support plate (304), and an inlet (306) is provided on the top of the medicine tank (305). The inlet (306) is provided with a sealing cap. A medicine pump (307) is also provided on the support plate (304). The medicine pump (307) is a corrosion-resistant creep worm pump. A pump is electrically connected to the control module and supports quantitative drug dosing. The inlet end of the pump (307) is connected to the bottom end of the drug tank (305) through a first hose (308). The outlet end of the pump (307) is connected to the nozzle (310) through a second hose (309). The nozzle (310) is fixed to the end of the nozzle holder (311). The nozzle holder (311) is fixed to the inner wall of the nickel-containing treatment tank (301), the phosphorus-containing treatment tank (302), or the cyanide-containing treatment tank (303).

6. The wastewater treatment system for PCB immersion gold plating process according to claim 1, characterized in that, The deep purification component (3) also includes three water purification pipes (312), which are respectively disposed on the side walls of the nickel-containing treatment tank (301), the phosphorus-containing treatment tank (302) and the cyanide-containing treatment tank (303). The water purification pipes (312) are made of corrosion-resistant PVC.

7. The wastewater treatment system for PCB immersion gold plating process according to claim 1, characterized in that, Also includes The drive pump (4) is a corrosion-resistant centrifugal pump used to pump wastewater from the wastewater classification and collection assembly (1) into the pretreatment assembly (2). The inlet of the drive pump (4) is connected to the main manifold (106) through a flange, and the outlet of the drive pump (4) is connected to the pH adjustment tank (201) through a pipeline. The control module, including a PLC and a touch screen, is electrically connected to the first solenoid valve (105), the second solenoid valve (210), the third solenoid valve (213), the pH sensor (214), and the dosing pump (307) of the dosing device. It adjusts the dosage and the on / off state of the solenoid valves according to the pH value monitored by the pH sensor (214) for automated control of the wastewater treatment process.

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