A system for treating acid copper electroplating wastewater

Abstract

The utility model discloses a kind of acid copper electroplating wastewater treatment systems, belong to sewage treatment technical field;The system includes the pretreatment module, electric desalination module and tailing processing module connected in turn;Wherein pretreatment module includes liquid storage bin and first sedimentation tank, and first sedimentation tank is connected first pH adjusting assembly;Electric desalination module includes electrodialysis equipment and electrolytic equipment;Electrodialysis equipment is used to carry out the preliminary purification of copper ion to solution from first sedimentation tank, and electrolytic equipment is used to carry out electrolysis to liquid from electrodialysis equipment;The utility model is provided with pretreatment module and electrodialysis equipment before electrolysis, by adjusting the PH value of acid copper electroplating wastewater in pretreatment stage, other metal ions can be made to form corresponding hydroxide precipitate without lossing copper in acid copper electroplating wastewater, and electrodialysis equipment can purify supernatant after precipitation, thereby effectively improve the recovery efficiency of acid copper wastewater.

Description

Technical Field

[0001] This utility model relates to the field of wastewater treatment technology, and in particular to a copper electroplating wastewater treatment system. Background Technology

[0002] Electroplating is the process of depositing a thin layer of another metal or alloy onto the surface of certain metals using the principle of electrolysis. It utilizes electrolysis to attach a metal film to the surface of metal or other material parts, thereby preventing metal oxidation (such as rust), improving wear resistance, conductivity, reflectivity, corrosion resistance (e.g., copper sulfate), and enhancing aesthetics. Electroplating generates wastewater. The quality of electroplating wastewater is complex, and its composition is difficult to control. It contains heavy metal ions such as chromium, cadmium, nickel, copper, zinc, gold, and silver, as well as cyanides, some of which are highly toxic substances that are carcinogenic, teratogenic, and mutagenic.

[0003] For high-concentration copper acid wastewater, copper can be recovered by direct electrolysis. However, the electrolytic copper obtained by this method has low purity, poor quality, high brittleness, and is prone to blackening.

[0004] To address the aforementioned problems, this invention provides an acid copper electroplating wastewater treatment system, which solves the technical problem of low acid copper wastewater recovery efficiency in the prior art. Utility Model Content

[0005] This invention provides a copper plating wastewater treatment system to solve the technical problem of low copper plating wastewater recovery efficiency in the prior art.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0007] This utility model provides an acid copper electroplating wastewater treatment system, comprising:

[0008] The pretreatment module, the electro-desalination module, and the tailings processing module are connected in sequence.

[0009] The pretreatment module includes a storage tank and a first sedimentation tank. The storage tank is connected to a waste liquid outlet, and the outlet of the storage tank is connected to the first sedimentation tank. The first sedimentation tank is connected to a first pH adjustment component.

[0010] The electro-desalination module includes an electrodialysis device and an electrolysis device; the supernatant outlet of the first sedimentation tank is connected to the inlet of the electrodialysis device, the electrodialysis device is used to perform preliminary purification of copper ions in the solution from the first sedimentation tank, the sludge discharge outlet of the first sedimentation tank is connected to the sludge collection chamber of the tailings treatment module, the outlet of the electrodialysis device is connected to the electrolysis device, and the electrolysis device is used to electrolyze the liquid from the electrodialysis device.

[0011] Furthermore, the electro-desalination module also includes a reverse osmosis device connected in series between the electrodialysis device and the electrolysis device. The inlet of the reverse osmosis device is connected to the outlet of the electrodialysis device, and the outlet of the reverse osmosis device is connected to the inlet of the electrolysis device. The reverse osmosis device is used to perform secondary purification of copper ions in the solution from the electrodialysis device.

[0012] Furthermore, the tailings treatment module also includes a second sedimentation tank and a filtration tank. The second sedimentation tank is connected to the lean liquid outlet of the electrolysis equipment. A second pH adjustment component is connected inside the second sedimentation tank. The supernatant outlet of the second sedimentation tank is connected to the filtration tank, which is used to filter the supernatant from the second sedimentation tank.

[0013] Furthermore, the tailings processing module also includes an evaporation device, which is connected to the filtration tank and is used to evaporate and crystallize the filtrate from the filtration tank.

[0014] Furthermore, the electrolysis equipment is a cyclone electrowinning device.

[0015] Furthermore, the cyclone electrowinning device is connected to a colloidal storage tank and a reducing agent storage tank. The colloidal storage tank is used to replenish the solution in the cyclone electrowinning device with colloidal material, and the reducing agent storage tank is used to replenish the solution in the cyclone electrowinning device with reducing agent.

[0016] Furthermore, the colloid is bone glue or guar gum, and the reducing agent is sodium sulfite or sodium metabisulfite.

[0017] Furthermore, the anode material of the swirl electrowinning device is titanium-coated lead dioxide.

[0018] Furthermore, the cathode material of the swirl electrowinning device is copper foam.

[0019] Furthermore, the condensate pipe of the evaporation equipment is connected to the freshwater storage tank of the tailings treatment module.

[0020] Compared with the prior art, the technical solution disclosed in this utility model has the following beneficial effects:

[0021] (1) In the pretreatment stage, this utility model adjusts the pH value of the acid copper electroplating wastewater, which can make other metal ions form corresponding hydroxide precipitates without losing the copper in the acid copper electroplating wastewater, thereby improving the purity of the copper generated by subsequent electrolysis.

[0022] (2) By setting up an electrodialysis device upstream of the electrolysis equipment, this utility model can purify the supernatant after precipitation, thereby further improving the purity of the copper generated by electrolysis. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is a schematic diagram of the acid copper electroplating wastewater treatment system in an embodiment of this utility model.

[0025] The components include: 1. Storage tank; 2. First sedimentation tank; 3. First pH adjustment component; 4. Electrodialysis equipment; 5. Electrolysis equipment; 6. Sludge collection tank; 7. Reverse osmosis equipment; 8. Second sedimentation tank; 9. Filtration tank; 10. Second pH adjustment component; 11. Evaporation equipment; 12. Colloidal storage tank; 13. Reducing agent storage tank; and 14. Freshwater storage tank. Detailed Implementation

[0026] 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.

[0027] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0028] This invention provides a copper plating wastewater treatment system to solve the technical problem of low copper plating wastewater recovery efficiency in the prior art.

[0029] refer to Figure 1 The present invention discloses a copper electroplating wastewater treatment system, comprising a pretreatment module, an electro-desalination module, and a tailings treatment module connected in sequence. The pretreatment module includes a storage tank 1 and a first sedimentation tank 2. The storage tank 1 is connected to a wastewater outlet, and the outlet of the storage tank 1 is connected to the first sedimentation tank 2. The first sedimentation tank 2 is connected to a first pH adjustment component 3. The electro-desalination module includes an electrodialysis device 4 and an electrolysis device 5. The supernatant outlet of the first sedimentation tank 2 is connected to the inlet of the electrodialysis device 4. The electrodialysis device 4 is used for preliminary purification of copper ions from the solution in the first sedimentation tank 2. The sludge discharge outlet of the first sedimentation tank 2 is connected to the sludge collection tank 6 of the tailings treatment module. The outlet of the electrodialysis device 4 is connected to the electrolysis device 5. The electrolysis device 5 is used for electrolysis of the liquid from the electrodialysis device 4.

[0030] In this embodiment, the first sedimentation tank 2 is connected to a first pH adjustment component 3, which uses soda ash or liquid alkali solution to adjust the pH of the copper plating wastewater to 4-5, thereby reducing the concentration of metal ions (Zn) in the copper plating wastewater. 2+ Al 3+ Fe 3+ Cr 3+ (etc.) to form corresponding hydroxide precipitates, while copper is basically not lost; after the reaction, the suspension is filtered and separated in the first sedimentation tank 2 to obtain supernatant and combined sludge; then the supernatant in the first sedimentation tank 2 is discharged into the electrodialysis equipment 4 for dialysis to concentrate the copper concentration of the supernatant to about 30 g / L, and then the concentrated supernatant is discharged into the electrolysis equipment 5 for electrolysis. During the electrolysis process, an appropriate amount of bone glue or guar gum is added to the solution periodically, and a reducing agent is added to reduce the residual chlorine generated by electrodeposition to avoid the residual chlorine oxidizing and damaging the anode; when the copper concentration in the solution is... When the concentration is below 5 g / L, electrolysis is stopped, the lean solution is discharged, and fresh solution is added. Because a pretreatment module and electrodialysis equipment 4 are set up before electrolysis, the pH value of the acid copper plating wastewater is adjusted during the pretreatment stage. This allows other metal ions to form corresponding hydroxide precipitates without losing copper in the acid copper plating wastewater, thereby improving the purity of the copper generated by subsequent electrolysis. The electrodialysis equipment 4 can purify the supernatant after precipitation, further improving the purity of the copper generated by electrolysis, thus effectively improving the recovery efficiency of acid copper wastewater.

[0031] In this embodiment, the electro-desalination module also includes a reverse osmosis unit 7 connected in series between the electrodialysis unit 4 and the electrolysis unit 5. The inlet of the reverse osmosis unit 7 is connected to the outlet of the electrodialysis unit 4, and the outlet of the reverse osmosis unit 7 is connected to the inlet of the electrolysis unit 5. The reverse osmosis unit 7 is used to perform secondary purification of copper ions in the solution from the electrodialysis unit 4. At the same time, the fresh water produced by the reverse osmosis unit 7 is discharged to the fresh water storage tank 14 of the tailings treatment module, which can be used for electroplating operations or other production operations.

[0032] The tailings processing module in this embodiment also includes a second sedimentation tank 8 and a filter tank 9. The second sedimentation tank 8 is connected to the lean liquid outlet of the electrolysis equipment 5. A second pH adjustment component 10 is connected inside the second sedimentation tank 8. The supernatant outlet of the second sedimentation tank 8 is connected to the filter tank 9, which is used to filter the supernatant from the second sedimentation tank 8. During the operation of the electrolysis equipment 5, the copper concentration in the solution gradually decreases, forming a lean liquid with a copper concentration of less than 5 g / L. After the lean liquid is discharged into the second sedimentation tank 8, soda ash or liquid alkali is added to the lean liquid through the second pH adjustment component 10 to adjust the pH of the lean liquid to 9-10, so that the copper ions in the lean liquid form corresponding hydroxide precipitates. After the reaction is completed, a suspension is formed in the second sedimentation tank 8. The turbid liquid is discharged into the filter tank 9 for filtration, resulting in a supernatant containing less than 0.5 ppm of copper and a copper precipitate. The copper hydroxide precipitate is returned to the electrolysis equipment 5 for electrolysis, and the supernatant is discharged into the tailings treatment module for further processing. The tailings treatment module also includes an evaporation device 11, which is connected to the filter tank 9. The evaporation device 11 is used to evaporate and crystallize the filtrate from the filter tank 9. Because the acid copper electroplating wastewater contains a large amount of sulfate ions, a large amount of sodium ions are introduced during the subsequent pH adjustment process. Sodium sulfate crystals can be obtained by evaporation and crystallization. The byproduct is condensate, which is discharged into the freshwater storage tank 14 of the tailings treatment module.

[0033] In this embodiment, the electrolysis device 5 is a cyclone electrowinning device, which is connected to a colloidal storage tank 12 and a reducing agent storage tank 13. The colloidal storage tank 12 is used to replenish the solution in the cyclone electrowinning device with colloidal material, and the reducing agent storage tank 13 is used to replenish the solution in the cyclone electrowinning device with reducing agent. The colloidal material is bone glue or guar gum, and the reducing agent is sodium sulfite or sodium metabisulfite. The purpose of using a cyclone electrowinning device is to improve the recovery efficiency of metallic copper. A relatively mature cyclone electrowinning device in the prior art can be used for the operation. At the same time, the anode material of the cyclone electrowinning device is titanium coated lead dioxide. In addition, the anode material can also be titanium coated ruthenium iridium, titanium coated tantalum iridium, etc. The cathode material of the cyclone electrowinning device is foamed copper. Because foamed copper has a huge surface area, it can reduce the actual current density during the electrowinning process, and has the advantages of high current efficiency, few side reactions, and dense metallic copper growth on the surface. In addition, the cathode material can also be 316 stainless steel sheet, titanium sheet, etc., without specific limitations.

[0034] It should be noted that, for those skilled in the art, it is obvious that this utility model is not limited to the details of the above exemplary embodiments, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this utility model. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of this utility model is defined by the appended claims rather than the foregoing description. Therefore, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within this utility model, and no reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A copper electroplating wastewater treatment system, characterized in that, include: The pretreatment module, the electro-desalination module, and the tailings processing module are connected in sequence. The pretreatment module includes a storage tank (1) and a first sedimentation tank (2). The storage tank (1) is connected to the waste liquid outlet, and the outlet of the storage tank (1) is connected to the first sedimentation tank (2). The first sedimentation tank (2) is connected to the first pH adjustment component (3). The electro-desalination module includes an electrodialysis device (4) and an electrolysis device (5); the supernatant outlet of the first sedimentation tank (2) is connected to the inlet of the electrodialysis device (4), the electrodialysis device (4) is used to perform preliminary purification of copper ions in the solution from the first sedimentation tank (2), the sludge discharge outlet of the first sedimentation tank (2) is connected to the sludge collection chamber (6) of the tailings treatment module, the outlet of the electrodialysis device (4) is connected to the electrolysis device (5), and the electrolysis device (5) is used to electrolyze the liquid from the electrodialysis device (4).

2. The acid copper electroplating wastewater treatment system according to claim 1, characterized in that, The electro-desalination module also includes a reverse osmosis device (7) connected in series between the electrodialysis device (4) and the electrolysis device (5). The inlet of the reverse osmosis device (7) is connected to the outlet of the electrodialysis device (4), and the outlet of the reverse osmosis device (7) is connected to the inlet of the electrolysis device (5). The reverse osmosis device (7) is used to perform secondary purification of copper ions in the solution from the electrodialysis device (4).

3. The acid copper electroplating wastewater treatment system according to claim 2, characterized in that, The tailings treatment module further includes a second sedimentation tank (8) and a filter tank (9). The second sedimentation tank (8) is connected to the lean liquid outlet of the electrolysis equipment (5). A second pH adjustment component (10) is connected inside the second sedimentation tank (8). The supernatant outlet of the second sedimentation tank (8) is connected to the filter tank (9). The filter tank (9) is used to filter the supernatant from the second sedimentation tank (8).

4. The acid copper electroplating wastewater treatment system according to claim 3, characterized in that, The tailings processing module also includes an evaporation device (11), which is connected to the filter tank (9). The evaporation device (11) is used to evaporate and crystallize the filtrate from the filter tank (9).

5. The acid copper electroplating wastewater treatment system according to claim 1, characterized in that, The electrolysis equipment (5) is a cyclone electrowinning device.

6. The acid copper electroplating wastewater treatment system according to claim 5, characterized in that, The cyclone electrowinning device is connected to a colloidal storage tank (12) and a reducing agent storage tank (13). The colloidal storage tank (12) is used to replenish the solution in the cyclone electrowinning device with colloidal material, and the reducing agent storage tank (13) is used to replenish the solution in the cyclone electrowinning device with reducing agent.

7. The acid copper electroplating wastewater treatment system according to claim 6, characterized in that, The colloid is bone glue or guar gum, and the reducing agent is sodium sulfite or sodium metabisulfite.

8. The acid copper electroplating wastewater treatment system according to claim 5, characterized in that, The anode material of the cyclone electrowinning device is titanium-coated lead dioxide.

9. The acid copper electroplating wastewater treatment system according to claim 5, characterized in that, The cathode material of the swirl electrowinning device is copper foam.

10. The acid copper electroplating wastewater treatment system according to claim 4, characterized in that, The condensate pipe of the evaporation equipment (11) is connected to the fresh water storage tank (14) of the tailings treatment module.

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