Electrocoppering waste liquid copper sulfate recovery device

Abstract

The utility model relates to the technical field of copper electroplating waste liquid recovery, in particular to a copper electroplating waste liquid copper sulfate recovery device which comprises a copper sulfate electroplating bath, a temporary storage tank, a heat exchanger, a factory service end ice water machine, a separator, a crystal collecting tank and a volatilization air exhaust dryer. An outlet of the copper sulfate electroplating tank is communicated with an inlet of the temporary storage tank, an outlet of the temporary storage tank is connected with an inlet of the heat exchanger, the heat exchanger is communicated with the factory service end water chiller, cold water of the factory service end water chiller circulates in the heat exchanger, and a filter screen is arranged at the bottom of the heat exchanger and communicated with the dilute waste liquid collecting tank. The copper electroplating wastewater discharge is improved, copper sulfate is separated out and purified through low-temperature crystallization and collected, waste liquid reduction and resource recovery are achieved, the environmental protection effect is optimized, meanwhile, a novel copper sulfate pentahydrate on-line auxiliary recovery process is constructed, simple recovery equipment is additionally arranged on the basis of the original copper electroplating process, and the copper electroplating wastewater is recycled. A waste reduction target can be achieved by invested a small amount of money, and the environment-friendly wastewater treatment cost is greatly reduced.

Description

Technical Field

[0001] This utility model relates to the field of copper plating waste liquid recycling technology, and in particular to a copper sulfate recycling device for copper plating waste liquid. Background Technology

[0002] Copper sulfate plating solutions are widely used in copper plating processes on wafers. With the continuous expansion of production scale, the amount of plating wastewater generated is also increasing daily. Copper-containing wastewater is complex in composition and difficult to treat; currently, most companies choose to outsource its treatment, which undoubtedly leads to high costs.

[0003] Existing methods for treating copper sulfate electroplating wastewater, such as chemical precipitation, can remove some copper ions, but they easily generate large amounts of sludge, and subsequent treatment is cumbersome. Evaporation and concentration methods are energy-intensive and require large equipment investments. Ion exchange methods have high equipment requirements, and resin regeneration costs are considerable. Currently, the cost of treating commercially available copper sulfate electroplating wastewater is approximately 10,000-30,000 RMB per ton, which is a heavy economic burden for enterprises. Utility Model Content

[0004] The purpose of this invention is to address the shortcomings of existing technologies by proposing a copper sulfate recovery device for electroplating waste liquid.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a copper sulfate recovery device for electroplating waste liquid, comprising a copper sulfate electroplating tank, a temporary storage tank, a heat exchanger, a plant-side chiller, a separator, a crystallization collection tank, and a volatile exhaust dryer; the outlet of the copper sulfate electroplating tank is connected to the inlet of the temporary storage tank, the outlet of the temporary storage tank is connected to the inlet of the heat exchanger, the heat exchanger is connected to the plant-side chiller and circulates with chilled water from the plant-side chiller, a filter screen is provided at the bottom of the heat exchanger, the filter screen is connected to the dilute waste liquid collection tank, the outlet of the heat exchanger is connected to the crystallization collection tank, and the volatile exhaust dryer is located at the top of the crystallization collection tank.

[0006] As a further description of the above technical solution:

[0007] A first control valve is installed on the pipeline between the copper sulfate electroplating tank and the temporary storage tank.

[0008] As a further description of the above technical solution:

[0009] A second control valve is installed on the pipeline between the temporary storage tank and the heat exchanger.

[0010] As a further description of the above technical solution:

[0011] The temporary storage tank is equipped with a level sensor for detecting the level of waste liquid in the temporary storage tank. The level sensor is connected to and controls the second control valve.

[0012] As a further description of the above technical solution:

[0013] The filter screen is set at a 45-degree angle.

[0014] This utility model has the following beneficial effects: This utility model

[0015] By purifying and collecting copper sulfate through low-temperature crystallization, the volume of copper plating wastewater is reduced. The recovered copper sulfate pentahydrate crystals can be sold as industrial raw materials, increasing economic benefits. The device has a simple structure, low investment cost, and is easy to promote and apply in existing copper plating processes. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of the copper sulfate recovery device for electroplating waste liquid proposed in this utility model.

[0017] Legend:

[0018] 1. Copper sulfate electroplating tank; 2. First control valve; 3. Temporary storage tank; 4. Second control valve; 5. Liquid level sensor; 6. Heat exchanger; 7. Plant-side chiller; 8. Separator; 9. Filter screen; 10. Dilute waste liquid collection tank; 11. Crystallization collection tank; 12. Volatile exhaust dryer. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0020] Reference Figure 1 One embodiment of this utility model is a copper sulfate recovery device for electroplating waste liquid, which includes a copper sulfate electroplating tank 1, a temporary storage tank 3, a heat exchanger 6, a plant-side chiller 7, a separator 8, a crystallization collection tank 11, and a volatile exhaust dryer 12.

[0021] The copper sulfate electroplating tank 1 is connected to the temporary storage tank 3: The copper sulfate electroplating tank 1 serves as the initial source of copper electroplating waste liquid, and its outlet is connected to the inlet of the temporary storage tank 3 via a corrosion-resistant PVC pipe. A first control valve 2, preferably an electric ball valve, is installed on this connecting pipe. The electric ball valve can precisely control the flow rate of the electroplating waste liquid from the copper sulfate electroplating tank 1 into the temporary storage tank 3. Through an external control system, the opening degree of the electric ball valve can be remotely controlled according to actual production needs, achieving precise adjustment of the waste liquid flow rate.

[0022] The temporary storage tank 3 is connected to the heat exchanger 6: the outlet of the temporary storage tank 3 is also connected to the inlet of the heat exchanger 6 via a section of corrosion-resistant PP pipe. A second control valve 4, which is a pneumatic diaphragm valve, is installed on this pipe. A level sensor 5 is installed inside the temporary storage tank 3, with its probe facing the liquid surface. The level sensor 5 and the second control valve 4 are interconnected and controlled by a signal cable. The level sensor 5 monitors the liquid level of the waste liquid in the temporary storage tank 3 in real time. When the liquid level reaches the preset upper limit, the level sensor 5 immediately transmits a signal through the cable to the control module of the pneumatic diaphragm valve. Upon receiving the signal, the control module drives the pneumatic diaphragm valve to open, allowing the waste liquid in the temporary storage tank 3 to flow smoothly into the heat exchanger 6.

[0023] Heat exchanger 6 is connected to the plant-side chiller 7: Heat exchanger 6 and plant-side chiller 7 are connected via stainless steel pipes, forming a complete cold water circulation loop for cooling waste liquid. A flow regulating valve is installed on the inlet pipe of heat exchanger 6 to regulate the flow rate of cold water entering heat exchanger 6, ensuring efficient and stable heat exchange. The cold water produced by plant-side chiller 7 first flows into heat exchanger 6 through pipes, completes heat exchange within heat exchanger 6, and then flows back to plant-side chiller 7 through pipes for further cooling and circulation.

[0024] Other connections of heat exchanger 6: A filter screen 9 at a 45-degree angle is installed at the bottom of heat exchanger 6. The filter screen 9 can be made of stainless steel, which has good corrosion resistance and mechanical strength, and is used for solid-liquid separation. The filter screen 9 is fixed to the bottom of heat exchanger 6, and a dilute waste liquid collection tank 10 is connected below the filter screen 9.

[0025] The volatile air extraction dryer 12 is connected to the crystallization collection tank 11: The volatile air extraction dryer 12 is installed on the top of the crystallization collection tank 11, and the air extraction port of the volatile air extraction dryer 12 is aligned with the internal space of the crystallization collection tank 11. It is connected to the external waste gas treatment device through a pipe to ensure that the extracted humid air can be properly treated.

[0026] Working principle:

[0027] Waste Liquid Temporary Storage and Transportation: During the electroplating production process, electroplating waste liquid is continuously generated in the copper sulfate electroplating tank 1. When it is necessary to discharge the waste liquid for treatment, the operator opens the first control valve 2 through the external control system. Under the action of gravity, the electroplating waste liquid flows into the temporary storage tank 3 through the pipeline. The temporary storage tank 3 serves as a buffer and temporary storage for the waste liquid, allowing it to enter the subsequent treatment process relatively stably.

[0028] Heat exchange and cooling crystallization: As the waste liquid level in the temporary storage tank 3 rises, when it reaches the upper limit set by the level sensor 5, the level sensor 5 triggers a signal, opening the pneumatic diaphragm valve. The waste liquid in the temporary storage tank 3 flows into the heat exchanger 6 through the pipeline. Inside the heat exchanger 6, the electroplating waste liquid at a temperature of 30-50℃ exchanges heat with <10℃ cold water supplied from the chiller 7 at the plant end. During the heat exchange process, heat is transferred from the waste liquid to the cold water, causing the waste liquid temperature to drop rapidly. When the temperature of the concentrated waste liquid drops to <20℃, the solubility of copper sulfate decreases significantly, and crystallization begins.

[0029] Solid-liquid separation and collection: After cooling and crystallization, the mixture flows downwards under gravity to the filter screen 9 at the bottom of the heat exchanger 6. Because the filter screen 9 is set at a 45-degree angle, the crystallized copper sulfate pentahydrate crystals are intercepted by the filter screen 9, while the remaining dilute waste liquid flows down the angle of the filter screen 9 and enters the dilute waste liquid collection tank 10 for collection through the sealed connection. The copper sulfate pentahydrate crystals intercepted by the filter screen 9 gradually move towards the lower end of the filter screen 9 under the influence of gravity and the subsequent movement of the mixture, eventually falling into the crystallization collection tank 11 through the silica gel pipe at the outlet of the heat exchanger 6, thus achieving the collection of copper sulfate pentahydrate.

[0030] Drying process: The evaporative air dryer 12 located at the top of the crystallization collection tank 11 starts working. It extracts the humid air in the crystallization collection tank 11 through the air extraction port and transports it to the external waste gas treatment device through pipeline. During the extraction process, the humidity in the crystallization collection tank 11 gradually decreases, and the collected copper sulfate pentahydrate crystals are dried to obtain a relatively dry copper sulfate pentahydrate product.

[0031] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A copper sulfate recovery device for electroplating waste liquid, characterized in that: The system includes a copper sulfate electroplating tank (1), a temporary storage tank (3), a heat exchanger (6), a plant-side chiller (7), a separator (8), a crystallization collection tank (11), and a volatile exhaust dryer (12). The outlet of the copper sulfate electroplating tank (1) is connected to the inlet of the temporary storage tank (3), the outlet of the temporary storage tank (3) is connected to the inlet of the heat exchanger (6), the heat exchanger (6) is connected to the plant-side chiller (7) and is supplied with chilled water from the plant-side chiller (7), a filter screen (9) is provided at the bottom of the heat exchanger (6), the filter screen (9) is connected to the dilute waste liquid collection tank (10), the outlet of the heat exchanger (6) is connected to the crystallization collection tank (11), and the volatile exhaust dryer (12) is located at the top of the crystallization collection tank (11).

2. The copper sulfate recovery device for electroplating waste liquid according to claim 1, characterized in that: A first control valve (2) is provided on the pipeline between the copper sulfate electroplating tank (1) and the temporary storage tank (3).

3. The copper sulfate recovery device for electroplating waste liquid according to claim 1, characterized in that: A second control valve (4) is provided on the pipeline between the temporary storage tank (3) and the heat exchanger (6).

4. The copper sulfate recovery device for electroplating waste liquid according to claim 1, characterized in that: The temporary storage tank (3) is equipped with a level sensor (5) for detecting the level of waste liquid in the temporary storage tank (3). The level sensor (5) is connected to the second control valve (4) and controls the second control valve (4).

5. The copper sulfate recovery device for electroplating waste liquid according to claim 1, characterized in that: The filter (9) is set at a 45-degree angle.

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