Copper-containing waste liquid recovery treatment system

Abstract

The utility model discloses a copper-containing waste liquid recovery treatment system which comprises a pretreatment unit, a copper recovery unit, a purification and refining unit and a waste liquid treatment unit. The pretreatment unit is used for removing impurities and grease through a filtering module and an air flotation oil removal module; the copper recycling unit is used for separating and recycling copper ions by using a pH adjusting tank, a chemical precipitation tank and a replacement reaction tank; the purification and refining unit improves the purity of a copper product through a fire refining furnace; and the waste liquid treatment unit ensures that waste liquid reaches the standard and is discharged through a neutralization tank and an automatic pH regulation system. The system realizes efficient recovery of copper resources and stable treatment of waste liquid through modular design and intelligent control, is suitable for copper-containing waste liquid treatment in the industries of electroplating, electronics, chemical engineering and the like, and has the remarkable advantages of compact process, high automation degree, high resource recovery rate and environmental protection standard reaching.

Description

A copper-containing waste liquid recovery and treatment system Technical Field

[0001] This utility model relates to the field of industrial waste liquid treatment technology, and more specifically, to a copper-containing waste liquid recycling and treatment system. Background Technology

[0002] In industries such as electroplating, electronic circuit board manufacturing, and copper processing, the large-scale generation of copper-containing wastewater has become a key issue restricting the green development of enterprises. Traditional methods for treating copper-containing wastewater suffer from serious resource waste, low treatment efficiency, and insufficient automation, as specifically manifested below:

[0003] Traditional processes often employ single chemical precipitation or displacement methods to recover copper. However, due to the rudimentary control of reaction conditions (such as manual pH adjustment and uneven stirring), copper ions are difficult to completely separate, resulting in recovery rates generally lower than the industry's ideal level. Furthermore, the purity of the recovered crude copper is limited, requiring external processing for purification, which increases costs and limits its application in high-end fields.

[0004] Furthermore, the composition of copper-containing wastewater varies significantly across different industries (e.g., electroplating wastewater has a high oil content, while circuit board etching wastewater is highly acidic). Traditional equipment lacks modular design, making it difficult to flexibly adapt to diverse processing needs. For example, high-oil wastewater requires additional pretreatment steps, but traditional processes do not integrate efficient oil removal modules, causing grease to interfere with subsequent copper recovery and affecting processing efficiency.

[0005] Traditional pH adjustment relies on manual addition of chemicals, which has low precision and strong lag, easily leading to fluctuations in the acidity and alkalinity of wastewater exceeding emission standards (e.g., pH < 6 or > 9). Simultaneously, incomplete removal of heavy metal ions (such as copper ions) can cause water and soil pollution if directly discharged, posing a high risk of environmental violations for businesses.

[0006] Traditional equipment lacks real-time monitoring and intelligent control functions. Process parameters (such as reaction time and dosage) need to be manually adjusted, resulting in large operational errors and long batch changeover times. In addition, key components (such as filters and dosing pumps) are prone to clogging or corrosion damage due to impurities, requiring frequent maintenance and leading to long equipment downtime, which increases the company's operation and maintenance costs.

[0007] To address the aforementioned issues, this invention provides a copper-containing wastewater recycling and treatment equipment that integrates modular processing, high-efficiency copper recovery, and intelligent pH control. Through full-process automated control and key process optimization, it achieves high-value utilization of copper resources and stable, compliant discharge of wastewater, meeting the multiple demands of modern industry for environmental protection, economy, and efficiency. Summary of the Invention

[0008] The purpose of this utility model is to address the shortcomings of existing technologies.

[0009] A copper-containing waste liquid recycling and treatment system includes a pretreatment unit, a copper recovery unit, a purification and refining unit, and a waste liquid treatment unit connected in sequence.

[0010] The pretreatment unit includes a filtration module and an air flotation oil removal module, used to remove large particulate impurities and oily substances from the waste liquid;

[0011] The copper recovery unit includes a pH adjustment tank, a chemical precipitation tank, and a displacement reaction tank, used to achieve the precipitation or displacement recovery of copper ions;

[0012] The purification and refining unit includes a pyrometallurgical refining furnace, used to improve the purity of copper products;

[0013] The waste liquid treatment unit includes a neutralization tank for adjusting the pH value of the final waste liquid to the discharge standard.

[0014] Preferably, the filtration module includes a filter screen and a sand filter, wherein the filter screen has a pore size of 0.1-1 mm and the sand filter is filled with quartz sand with a particle size of 0.5-2 mm.

[0015] Preferably, the air flotation oil removal module has a built-in dissolved air pump and an oil skimming device, with the dissolved air pump pressure being 0.3-0.6 MPa and the oil skimming frequency being 5-10 times / hour.

[0016] Preferably, the pH adjusting tank is equipped with a pH sensor and a dosing system, which can add sulfuric acid, hydrochloric acid, sodium hydroxide or calcium hydroxide, and the pH adjustment range is 4-6.

[0017] Preferably, the chemical precipitation tank is equipped with a sodium sulfide dosing port and a stirrer, with a stirring speed of 20-50 r / min and a reaction temperature controlled at 20-40℃.

[0018] Preferably, the displacement reaction vessel has a built-in screw conveyor for conveying iron powder or zinc powder, and the displacement reaction time is 30-60 minutes.

[0019] Preferably, the pyrometallurgical refining furnace is equipped with an oxygen inlet and a quartz sand feeding port, the refining temperature is 1100-1300℃, and the oxygen flow rate is 5-10 m³ / h. 3 / h.

[0020] Preferably, the neutralization tank is equipped with an automatic pH adjustment system, which can adjust the pH value of the waste liquid to the discharge standard of 6-9.

[0021] Preferably, the automatic pH adjustment system includes a pH sensor, a PID controller, a dosing pump, and a stirrer; the pH sensor monitors the pH value of the waste liquid in real time and transmits the collected data to the PID controller after signal conditioning; the PID controller is connected to the dosing pump and the stirrer for control.

[0022] Compared with existing technologies, the beneficial effects of this utility model are:

[0023] 1. Through the coordinated operation of the pretreatment unit, copper recovery unit, purification and refining unit, and wastewater treatment unit, integrated treatment of copper-containing wastewater is achieved, from impurity removal to copper resource recovery and compliant discharge. The modular architecture supports flexible adjustment of the treatment process according to the composition of the wastewater (such as oil content and impurity concentration), significantly improving the equipment's compatibility and treatment efficiency for copper-containing wastewater from different industries (electroplating, electronics, chemicals, etc.).

[0024] 2. High-efficiency copper ion recovery is achieved through sodium sulfide precipitation or iron / zinc powder replacement, with a recovery rate significantly superior to traditional processes. Subsequent pyrometallurgical refining further enhances the purity of copper products, producing high-value-added refined copper that can be directly used in high-end manufacturing, effectively reducing raw material costs for enterprises.

[0025] 3. The automatic pH adjustment system achieves precise adjustment and stable attainment of the waste liquid's pH value through closed-loop control via real-time sensor monitoring, intelligent calculation by a PID controller, and accurate dosing by a dosing pump. The segmented control strategy dynamically adjusts the dosing mode based on pH deviation, improving response speed and adjustment accuracy, reducing reagent consumption, and lowering treatment costs.

[0026] 4. The combination of filter screen and sand filter in the pretreatment unit effectively intercepts large particulate impurities, and the air flotation oil removal module efficiently removes grease, reducing equipment wear and clogging risks and extending the service life of core components. Attached Figure Description

[0027] Figure 1 is a schematic diagram of the overall processing flow of a copper-containing waste liquid recycling and treatment system proposed in this utility model.

[0028] Figure 2 is a schematic diagram of the processing flow in the pretreatment unit of a copper-containing waste liquid recycling and treatment system proposed in this utility model.

[0029] Figure 3 is a schematic diagram of the processing flow in the copper recovery unit of a copper-containing waste liquid recycling system proposed in this utility model.

[0030] Figure 4 is a schematic diagram of the pH automatic adjustment system in the waste liquid treatment unit of a copper-containing waste liquid recycling and treatment system proposed in this utility model.

[0031] In the diagram: 1 - Filtration module; 2 - Air flotation oil removal module; 3 - pH adjustment tank; 4 - Chemical precipitation tank; 5 - Displacement reaction tank; 6 - Pyrometallurgical refining furnace; 7 - Neutralization tank; 11 - Filter screen; 12 - Sand filter; 21 - Dissolved air pump; 22 - Oil skimmer; 31 - pH sensor; 32 - Dosing system; 41 - Sodium sulfide dosing port; 42 - Agitator; 51 - Screw conveyor; 61 - Oxygen inlet device; 62 - Quartz sand feed port; 71 - Automatic pH adjustment system. Detailed Implementation

[0032] 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.

[0033] Referring to the figure, this embodiment provides a copper-containing waste liquid recycling and treatment system, including a pretreatment unit, a copper recovery unit, a purification and refining unit and a waste liquid treatment unit connected in sequence;

[0034] The pretreatment unit includes a filtration module 1 and an air flotation oil removal module 2, which are used to remove large particulate impurities and oily substances from the waste liquid.

[0035] The copper recovery unit includes a pH adjustment tank 3, a chemical precipitation tank 4, and a displacement reaction tank 5, which are used to achieve the precipitation or displacement recovery of copper ions.

[0036] The purification and refining unit includes a pyrometallurgical refining furnace 6, used to improve the purity of copper products;

[0037] The waste liquid treatment unit includes a neutralization tank 7, which is used to adjust the pH value of the final waste liquid to the discharge standard.

[0038] Furthermore, the filtration module 1 includes a filter screen 11 and a sand filter 12. The filter screen has a pore size of 0.1-1mm, and the sand filter is filled with quartz sand with a particle size of 0.5-2mm.

[0039] Furthermore, the air flotation oil removal module 2 has a built-in dissolved air pump 21 and an oil scraping device 22. The dissolved air pump pressure is 0.3-0.6MPa, and the oil scraping frequency is 5-10 times / hour.

[0040] Furthermore, the pH adjustment tank 3 is equipped with a pH sensor 31 and a dosing system 32. The dosing system can add sulfuric acid, hydrochloric acid, sodium hydroxide or calcium hydroxide, and the pH adjustment range is 4-6.

[0041] Furthermore, the chemical precipitation tank 4 is equipped with a sodium sulfide inlet 41 and a stirrer 42, with a stirring speed of 20-50 r / min and a reaction temperature controlled at 20-40℃.

[0042] Furthermore, the displacement reaction vessel 5 has a built-in screw conveyor 51 for conveying iron powder or zinc powder, and the displacement reaction time is 30-60 minutes.

[0043] Furthermore, the pyrometallurgical refining furnace 6 is equipped with an oxygen inlet 61 and a quartz sand feeding port 62, the refining temperature is 1100-1300℃, and the oxygen flow rate is 5-10 m³ / h. 3 / h.

[0044] Furthermore, the neutralization tank 7 is equipped with an automatic pH adjustment system 71, which can adjust the pH value of the waste liquid to the discharge standard of 6-9.

[0045] Furthermore, the pH automatic adjustment system 71 includes a pH sensor, a PID controller, a dosing pump, and a stirrer; the pH sensor monitors the pH value of the waste liquid in real time and transmits the collected data to the PID controller after signal conditioning; the PID controller is connected to the dosing pump and the stirrer for control.

[0046] The following is a detailed explanation of the operation process of the copper-containing waste liquid recovery and treatment system, outlining the operational steps and key control points according to each stage of the process:

[0047] I. Preprocessing stage:

[0048] Waste liquid introduction: Copper-containing waste liquid is transported to the pretreatment unit through a feed pump and first enters the filtration module.

[0049] Filtration and impurity removal: The waste liquid first passes through a filter screen (0.1-1mm aperture) to intercept large particles of impurities such as metal shavings and plastic pieces, and then enters a sand filter (filled with 0.5-2mm quartz sand) to remove fine suspended solids.

[0050] Air flotation for oil removal (for oily waste liquid): The filtered waste liquid flows into the air flotation oil removal module, where the dissolved air pump generates microbubbles, causing the oil droplets to coalesce and float to the surface.

[0051] The oil skimmer periodically removes floating oil from the liquid surface, and the separated oil is collected in the solid waste bin.

[0052] II. Copper Recovery Stage: Ion Separation and Preliminary Purification

[0053] pH adjustment: The pretreated waste liquid enters the pH adjustment tank. The pH sensor monitors the acidity and alkalinity in real time. The dosing system automatically adds sulfuric acid / hydrochloric acid or sodium hydroxide / calcium hydroxide to adjust the pH to 4-6.

[0054] Impurities such as iron and aluminum are precipitated out as hydroxides, and after filtration, a preliminarily purified copper-containing waste liquid is obtained.

[0055] Chemical precipitation method (suitable for high-concentration copper waste liquid): The waste liquid flows into a chemical precipitation tank, and sodium sulfide solution is added quantitatively through the sodium sulfide dosing port. The mixture is stirred at a speed of 20-50 r / min, and the reaction temperature is controlled at 20-40℃ to generate copper sulfide precipitate. After precipitation, the mixture is filtered to obtain copper sulfide filter residue (which can be further processed into copper salts).

[0056] Displacement method (suitable for low-concentration copper waste liquid): The waste liquid enters the displacement reaction tank, and iron powder or zinc powder is added evenly by the screw conveyor. The reaction takes 30-60 minutes, and the copper ions are replaced with crude copper powder.

[0057] After filtration, the excess metal is dissolved in dilute sulfuric acid and then filtered again to obtain crude copper with higher purity.

[0058] III. Refining and Purification Stage: Crude Copper Refining

[0059] Pyrometallurgical refining: crude copper is put into a pyrometallurgical refining furnace, oxygen is introduced and quartz sand is added, and the temperature is raised to 1100-1300℃.

[0060] Reaction principle: Impurities (iron, zinc, lead, etc.) are oxidized into oxides, which react with quartz sand to form slag. The slag floats to the surface of the molten copper and is then removed, ultimately yielding refined copper ingots.

[0061] Product collection: After the refined copper ingots are cooled, they are demolded, weighed, and packaged, and can be directly used in the electronics, electrical and other fields.

[0062] IV. Wastewater Treatment Stage: Achieving Discharge Standards

[0063] Automatic pH adjustment: The filtrate after copper recovery enters the neutralization tank, where a pH sensor monitors the pH value of the waste liquid in real time, and the data is transmitted to the PID controller.

[0064] The controller automatically adjusts the dosing pump according to the deviation, adding acid / alkali solutions (such as hydrochloric acid or sodium hydroxide), and the stirrer runs synchronously to mix the solution evenly until the pH stabilizes at 6-9.

[0065] Heavy metal detection and discharge: After the treated waste liquid is tested and the copper ion concentration meets the standard, it is transported to the municipal pipe network or reuse system through discharge pump.

[0066] In the above embodiments and during use, this recycling system has the following advantages:

[0067] 1. Through the coordinated operation of the pretreatment unit, copper recovery unit, purification and refining unit, and wastewater treatment unit, integrated treatment of copper-containing wastewater is achieved, from impurity removal to copper resource recovery and compliant discharge. The modular architecture supports flexible adjustment of the treatment process according to the composition of the wastewater (such as oil content and impurity concentration), significantly improving the equipment's compatibility and treatment efficiency for copper-containing wastewater from different industries (electroplating, electronics, chemicals, etc.).

[0068] 2. High-efficiency copper ion recovery is achieved through sodium sulfide precipitation or iron / zinc powder replacement, with a recovery rate significantly superior to traditional processes. Subsequent pyrometallurgical refining further enhances the purity of copper products, producing high-value-added refined copper that can be directly used in high-end manufacturing, effectively reducing raw material costs for enterprises.

[0069] 3. The automatic pH adjustment system achieves precise adjustment and stable attainment of the waste liquid's pH value through closed-loop control via real-time sensor monitoring, intelligent calculation by a PID controller, and accurate dosing by a dosing pump. The segmented control strategy dynamically adjusts the dosing mode based on pH deviation, improving response speed and adjustment accuracy, reducing reagent consumption, and lowering treatment costs.

[0070] 4. The combination of filter screen and sand filter in the pretreatment unit effectively intercepts large particulate impurities, and the air flotation oil removal module efficiently removes grease, reducing equipment wear and clogging risks and extending the service life of core components.

[0071] The above specific embodiments further illustrate the purpose, technical solution, and beneficial effects of this utility model. It should be understood that the above are only specific embodiments of this utility model, but the protection scope of this utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in this utility model, based on the technical solution and inventive concept of this utility model, should be covered within the protection scope of this utility model.

[0072] Furthermore, it should be understood in the description of this utility model that the terms indicating orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0073] Furthermore, in this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

Claims

1. A copper-containing waste liquid recovery and treatment system, characterized in that, The system includes a pretreatment unit, a copper recovery unit, a purification and refining unit, and a waste liquid treatment unit connected in sequence. The pretreatment unit includes a filtration module (1) and an air flotation oil removal module (2) for removing large particulate impurities and oily substances from the waste liquid. The copper recovery unit includes a pH adjustment tank (3), a chemical precipitation tank (4), and a displacement reaction tank (5) for precipitating or displacing and recovering copper ions. The purification and refining unit includes a pyrometallurgical refining furnace (6) for improving the purity of copper products. The waste liquid treatment unit includes a neutralization tank (7) for adjusting the pH value of the final waste liquid to the discharge standard.

2. The copper-containing waste liquid recovery and treatment system according to claim 1, characterized in that: The filtration module (1) includes a filter screen (11) and a sand filter (12). The filter screen has a pore size of 0.1-1 mm, and the sand filter is filled with quartz sand with a particle size of 0.5-2 mm.

3. The copper-containing waste liquid recovery and treatment system according to claim 1, characterized in that: The air flotation oil removal module (2) has a built-in dissolved air pump (21) and an oil scraping device (22). The dissolved air pump pressure is 0.3-0.6MPa and the oil scraping frequency is 5-10 times / hour.

4. The copper-containing waste liquid recovery and treatment system according to claim 1, characterized in that: The pH adjustment tank (3) is equipped with a pH sensor (31) and a dosing system (32). The dosing system can add sulfuric acid, hydrochloric acid, sodium hydroxide or calcium hydroxide, and the pH adjustment range is 4-6.

5. The copper-containing waste liquid recovery and treatment system according to claim 1, characterized in that: The chemical precipitation tank (4) is equipped with a sodium sulfide inlet (41) and a stirrer (42), with a stirring speed of 20-50 r / min and a reaction temperature controlled at 20-40℃.

6. The copper-containing waste liquid recovery and treatment system according to claim 1, characterized in that: The displacement reaction vessel (5) has a built-in screw conveyor (51) for conveying iron powder or zinc powder, and the displacement reaction time is 30-60 min.

7. The copper-containing waste liquid recovery and treatment system according to claim 1, characterized in that: The pyrometallurgical refining furnace is equipped with an oxygen inlet and a quartz sand feeding port. The refining temperature is 1100-1300℃, and the oxygen flow rate is 5-10 m³ / h. 3 / h.

8. The copper-containing waste liquid recovery and treatment system according to claim 1, characterized in that: The neutralization tank (7) is equipped with an automatic pH adjustment system (71), which can adjust the pH value of the waste liquid to the discharge standard of 6-9.

9. The copper-containing waste liquid recovery and treatment system according to claim 8, characterized in that: The automatic pH adjustment system (71) includes a pH sensor, a PID controller, a dosing pump, and a stirrer; the pH sensor monitors the pH value of the waste liquid in real time and transmits the collected data to the PID controller after signal conditioning; the PID controller is connected to the dosing pump and the stirrer.

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