Waste paint bucket recycling treatment system and method

Abstract

The invention discloses a waste paint bucket recycling treatment system and method, and relates to the technical field of waste paint bucket treatment.The treatment system comprises a crushing unit used for crushing waste paint buckets to obtain paint bucket fragments; the reaction unit comprises a reaction tank body, a reaction liquid can be put into the reaction tank body, and the reaction liquid can remove a paint coating on the fragments of the paint bucket; the cleaning unit is used for cleaning the fragments of the paint bucket; the post-treatment unit can be used for treating a mixed solution generated after the reaction of the reaction unit and cleaning wastewater generated by the cleaning unit. The waste paint bucket recycling treatment method disclosed by the invention is implemented by adopting the treatment system. The paint coating can be thoroughly removed, metal fragments can be efficiently recycled, and meanwhile waste water discharge and environmental pollution are reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of waste paint barrel treatment, and in particular to a waste paint barrel recycling and treatment system and method. Background Art

[0002] With the rapid development of industrialization, the amount of waste paint cans generated has increased year by year. These paint cans are usually made of metal materials, but due to the paint coating on their surface, direct recycling is quite difficult. Traditional disposal methods mainly include incineration, landfill, chemical treatment, and mechanical treatment. However, these methods have the following problems in practical application:

[0003] 1. Incineration. Incineration is a common method for removing paint coatings, breaking down the paint into gas or ash at high temperatures. However, the incineration process produces a large amount of harmful gases (such as dioxins and volatile organic compounds), causing serious environmental pollution. In addition, incineration equipment has high investment costs and energy consumption, and metal materials may oxidize or deform at high temperatures, affecting their recycling quality. Therefore, incineration is not suitable for large-scale promotion.

[0004] 2. Landfill disposal: Landfilling is a simple but unsustainable method of disposal. Directly landfilling used paint cans not only wastes precious metal resources, but may also pollute the soil and groundwater due to the leakage of harmful substances in the paint coating. Especially in the context of increasingly stringent environmental protection regulations, landfill disposal has been gradually eliminated.

[0005] 3. Chemical treatment: Chemical treatment involves removing the paint coating using strong acids, strong bases, or other chemical reagents. For example, hot alkaline reactions using sodium hydroxide solution can effectively dissolve organic components in the paint coating. However, existing chemical treatment processes often suffer from low efficiency, high cost, complex operations, and environmental pressures.

[0006] 4. Mechanical processing. Mechanical processing methods (such as crushing and grinding) can crush waste paint cans into small particles, but they cannot effectively remove the paint coating. The residual paint will affect the quality of the metal fragments and limit their reuse value. In addition, the mechanical processing process may generate a lot of dust and noise, which will have an adverse impact on the working environment.

[0007] In summary, the existing waste paint barrel treatment technology generally has the following problems:

[0008] Serious environmental pollution: Whether it is the harmful gases produced by incineration or the waste liquid produced by chemical treatment, it will cause varying degrees of pollution to the environment.

[0009] Low resource utilization: Landfill and mechanical processing cannot achieve efficient recovery of metal resources, wasting precious raw materials.

[0010] Complex process and high cost: Although chemical treatment can partially remove the paint coating, it is inefficient, costly, and complex to operate, making it difficult to meet the needs of industrial production.

[0011] Moreover, existing technologies mostly focus on a single link (such as paint removal or metal recovery) and lack an optimized design for the entire process from crushing to post-processing.

[0012] Therefore, a waste paint can recycling and processing system and method are provided to solve the above-mentioned problems existing in the prior art. Summary of the Invention

[0013] The purpose of the present invention is to provide a waste paint can recycling and processing system and method to solve the problems existing in the above-mentioned prior art, which can achieve the complete removal of paint coating and efficient recovery of metal fragments, while reducing wastewater discharge and environmental pollution.

[0014] To achieve the above object, the present invention provides the following solutions:

[0015] The present invention provides a waste paint barrel recycling and processing system, comprising:

[0016] A crushing unit, which is used to crush the waste paint cans to obtain paint can fragments;

[0017] A reaction unit, the reaction unit comprising a reaction tank body, wherein a reaction liquid can be placed in the reaction tank body, and the reaction liquid can remove the paint coating on the paint bucket fragments;

[0018] a cleaning unit, the cleaning unit being used to clean the paint bucket fragments;

[0019] A post-processing unit is provided, wherein the post-processing unit is capable of processing the mixed liquid generated after the reaction of the reaction unit and the cleaning wastewater generated by the cleaning unit.

[0020] Preferably, the crushing unit is a double-shaft crusher, which includes a crushing shell, a rotating cutter shaft is rotatably arranged in the crushing shell, and the rotating cutter shaft is connected to a first drive motor, and the first drive motor can drive the rotating cutter shaft to rotate to crush the waste paint cans;

[0021] There are two parallel rotating blade shafts, each of which is provided with a plurality of crushing blades, and the crushing blades on the two rotating blade shafts are arranged in a staggered manner;

[0022] A screen is also provided at the bottom of the crushing shell, and screen holes are provided on the screen.

[0023] Preferably, the double-shaft crusher also has an automatic reversal function, and when it is detected that the rotating cutter shaft is stuck, the double-shaft crusher automatically rotates in the opposite direction.

[0024] Preferably, the reaction tank body is arranged on a fixed bracket, the top of the reaction tank body is provided with a feed port and an exhaust port, the bottom is provided with a discharge port, and the exhaust port is further connected to an exhaust gas treatment device through an exhaust pipe, and the exhaust gas treatment device is used to treat the exhaust gas generated during the reaction process;

[0025] Wherein, the waste gas treatment device includes a condensation recovery device, an activated carbon adsorption tower and an alkali solution absorption tower which are connected in sequence, and the exhaust pipe is connected to a fan.

[0026] Preferably, the reaction tank is further provided with a stirring device, which is a paddle stirrer, comprising a second drive motor, a second reducer, a transmission shaft and a stirring blade, wherein the output shaft of the second drive motor is connected to the transmission shaft via the second reducer, and the transmission shaft is provided with a stirring blade, which can be driven to rotate by the second drive motor;

[0027] Wherein, the surface of the stirring blade is coated with polytetrafluoroethylene coating.

[0028] Preferably, the reaction unit further includes a heating device for heating the reaction liquid; wherein the heating device is a heating jacket, the heating jacket is wrapped around the outside of the reaction tank body, and an electric heating tube is provided in the heating jacket, and an insulation layer is also provided on the outside of the heating jacket.

[0029] Preferably, the reaction unit also includes a temperature control system, which is used to monitor and adjust the temperature of the reaction liquid in real time; wherein, the temperature control system includes a temperature sensor and a controller, the temperature sensor is arranged on the reaction tank body, and is used to monitor the temperature of the reaction liquid in real time, and the temperature sensor is connected to the controller signal and can transmit the monitored temperature data to the controller, and the controller is also connected to the electric heating tube signal and can adjust the heating temperature of the electric heating tube in real time according to the temperature data monitored by the temperature sensor.

[0030] Preferably, the cleaning unit includes a vibrating screening machine and a spraying system, the vibrating screening machine includes a screen, a vibrating motor and a fixed frame, the screen is arranged on the fixed frame, and the vibrating motor is used to drive the screen to vibrate;

[0031] The spray system is installed on the upper part of the vibrating screening machine and includes a plurality of high-pressure fan-shaped nozzles. The high-pressure fan-shaped nozzles are connected to a cleaning liquid inlet pipe for introducing cleaning liquid. A wastewater collection tank is also provided at the bottom of the vibrating screening machine, and the wastewater collection tank is connected to the post-processing unit.

[0032] Preferably, the post-processing unit includes a sedimentation tank and a dehydration device, the sedimentation tank is provided with a diversion device inside, the bottom of the sedimentation tank is a conical or inclined structure, the top of the sedimentation tank is provided with a supernatant outlet, the supernatant outlet is connected to the reaction unit through a return pipe, and the return pipe is also provided with a filtering device and a return pump;

[0033] The dehydration device adopts a belt filter press.

[0034] The present invention also provides a method for recycling and utilizing waste paint barrels, which is implemented using the waste paint barrel recycling and utilizing system described above, and includes the following steps:

[0035] S1, crushing the waste paint bucket by the crushing unit to obtain paint bucket fragments;

[0036] S2, placing the paint bucket fragments into the reaction tank, and fully mixing them with the reaction liquid to peel off the paint coating;

[0037] S3, cleaning the paint bucket fragments after the reaction is completed by the cleaning unit;

[0038] S4. Treating the mixed liquid generated after the reaction in the reaction unit and the cleaning wastewater generated by the cleaning unit through the post-treatment unit.

[0039] Compared with the prior art, the present invention has achieved the following technical effects:

[0040] In the present invention, the crushing unit can crush the waste paint bucket to obtain paint bucket fragments, the reaction unit can remove the paint coating on the paint bucket fragments, the cleaning unit can clean the paint bucket fragments after the reaction is completed, and the post-processing unit can process the waste alkali solution and cleaning wastewater. The invention integrates crushing, chemical reaction, cleaning and post-processing into one, realizes the complete removal of the paint coating and the efficient recovery of metal fragments, and reduces wastewater discharge and environmental pollution. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0042] Figure 1 This is a process flow chart for recycling and utilizing waste paint barrels according to an embodiment of the present invention;

[0043] Figure 2 Schematic diagram of the structure of the reaction unit in an embodiment of the present invention;

[0044] Figure 3 for Figure 2 AA cross-section of

[0045] Figure 4 Schematic diagram of the structure of a double-shaft crusher in an embodiment of the present invention;

[0046] Figure 5 Schematic diagram of the structure of a vibrating screening machine in an embodiment of the present invention.

[0047] In the figure: 1-second drive motor, 2-feed port, 3-second reducer, 4-drive shaft, 5-exhaust port, 6-reaction tank, 7-monitoring port, 8-fixed bracket, 9-discharge port, 10-stirring blade, 11-heating jacket; 12-fixing screw, 13-feed hopper, 14-crushing shell, 15-first drive motor, 16-first reducer, 17-connecting flange, 18-rotating knife shaft, 19-crushing blade, 20-machine tool; 21-screen, 22-vibration motor, 23-fixed frame, 24-vibration shaft, 25-spraying system. DETAILED DESCRIPTION

[0048] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0049] The purpose of the present invention is to provide a waste paint can recycling and processing system and method to solve the problems existing in the above-mentioned prior art, which can achieve the complete removal of paint coating and efficient recovery of metal fragments, while reducing wastewater discharge and environmental pollution.

[0050] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0051] Example 1

[0052] like Figure 1-Figure 5 As shown, this embodiment provides a waste paint barrel recycling and processing system, which mainly includes:

[0053] A crushing unit, which is used to crush the waste paint cans to obtain paint can fragments;

[0054] The reaction unit is a tank-type reactor including a reaction tank body 6. A reaction liquid can be placed in the reaction tank body 6. The reaction liquid can remove the paint coating on the paint bucket fragments. The reaction liquid can be selected according to specific work needs, and is preferably a sodium hydroxide solution. When the broken paint bucket fragments are placed in the reaction tank body 6 and fully mixed with the sodium hydroxide solution, the paint coating can be removed.

[0055] A cleaning unit, which is used to clean the paint bucket fragments after the reaction is completed;

[0056] A post-processing unit is provided, wherein the post-processing unit is capable of processing the mixed liquid generated after the reaction of the reaction unit and the cleaning wastewater generated by the cleaning unit.

[0057] In this embodiment, the crushing unit can crush the waste paint can to obtain paint can fragments, the reaction unit can remove the paint coating on the paint can fragments, the cleaning unit can clean the paint can fragments after the reaction is completed, and the post-processing unit can process the waste alkali solution and cleaning wastewater. The crushing, chemical reaction, cleaning and post-processing are integrated into one, thereby achieving the complete removal of the paint coating and the efficient recovery of metal fragments, while reducing wastewater discharge and environmental pollution.

[0058] In this embodiment, the crushing unit is a dual-shaft crusher, which includes a crushing shell 14 mounted on a machine tool 20. A feed hopper 13 is connected to the top of the crushing shell 14 for feeding the waste paint cans. A rotating cutter shaft 18 is rotatably mounted within the crushing shell 14. The rotating cutter shaft 18 is connected to a first drive motor 15, which drives the rotating cutter shaft 18 to rotate and crush the waste paint cans. The output shaft of the first drive motor 15 is connected to a first reducer 16, which is connected to the rotating cutter shaft 18 via a connecting flange 17.

[0059] In this embodiment, two rotating blade shafts 18 are provided in parallel, and a plurality of crushing blades 19 are provided on each rotating blade shaft 18 , and the crushing blades 19 on the two rotating blade shafts 18 are staggered to improve the crushing effect.

[0060] Furthermore, a screen is provided at the bottom of the crushing shell 14, on which sieve holes are densely opened, and paint bucket fragments crushed to a certain size can be screened through the sieve holes; wherein the aperture of the sieve holes is preferably 5 cm × 10 cm, which is used to control the size of the paint bucket fragments after crushing.

[0061] In this embodiment, a dual-shaft crusher is used in combination with a screen design to ensure that the paint bucket fragments are uniform in size after crushing, which facilitates efficient processing in subsequent reaction units.

[0062] In this embodiment, the material of the crushing blade 19 is high-strength alloy steel, which is wear-resistant and corrosion-resistant, and can adapt to the residual chemicals that may exist on the surface of the waste paint cans; the rotation speed of the rotating cutter shaft 18 is 80-120rpm; the feed speed of the double-shaft crusher is 500-1000kg per hour; the crushing time is 10-20 seconds on average for a single waste paint can.

[0063] In this embodiment, the double-shaft crusher also has an automatic reversal function. When it is detected that the rotating cutter shaft 18 is stuck, the system will automatically rotate in the opposite direction to prevent material blockage. Specifically, the automatic reversal function of the double-shaft crusher is achieved by real-time monitoring of the current of the first drive motor 15. When the rotating cutter shaft 18 is stuck due to material and the current of the first drive motor 15 exceeds a preset threshold, the control system immediately triggers a reversal command to rotate the rotating cutter shaft 18 in the opposite direction for 1-3 seconds to release the jam, and then automatically resumes forward rotation. If multiple reversals are ineffective, the machine will stop and alarm.

[0064] In this embodiment, if Figure 2-Figure 3 As shown, the reaction tank body 6 is mounted on a fixed bracket 8. The top of the reaction tank body 6 is provided with a feed port 2 and an exhaust port 5, and the bottom is provided with a discharge port 9. The feed port 2 is used to add sodium hydroxide solution and paint bucket fragments, the discharge port 9 is used to discharge the paint bucket fragments after the reaction, and the exhaust port 5 is used to discharge volatile organic compounds (VOCs) and alkaline gases generated during the reaction. The reaction tank body 6 is made of an alkali-corrosion-resistant material (stainless steel 316L) to increase its service life.

[0065] In this embodiment, a stirring device is further provided in the reaction tank body 6 for stirring the sodium hydroxide solution so that the sodium hydroxide solution is fully mixed with the paint bucket fragments to improve the stripping effect of the paint coating; wherein, the stirring device can be selected according to specific work needs. As a preferred embodiment, the stirring device is a paddle stirrer, including a second drive motor 1, a second reducer 3, a transmission shaft 4 and a stirring blade 10. The output shaft of the second drive motor 1 is connected to the transmission shaft 4 through the second reducer 3. The transmission shaft 4 is provided with a stirring blade 10. The second drive motor 1 can drive the stirring blade 10 to rotate to achieve stirring. The surface of the stirring blade 10 is coated with polytetrafluoroethylene to improve corrosion resistance and extend service life.

[0066] In this embodiment, the reaction unit also includes a heating device, which is used to heat the sodium hydroxide solution. Through the hot alkali reaction, the paint coating on the surface of the waste paint barrel can be completely removed, and the paint removal rate reaches more than 99%, ensuring that the quality of the metal fragments meets the recycling requirements; wherein, the heating device can be selected according to specific work needs. As a preferred embodiment, the heating device is a heating jacket 11, which is wrapped around the outside of the reaction tank body 6, and an electric heating tube is provided in the heating jacket 11. The outside of the heating jacket 11 is also provided with an insulation layer, which provides heat energy and maintains the reaction temperature through the electric heating tube. The insulation layer is used to reduce heat loss and improve energy utilization efficiency.

[0067] Furthermore, the reaction unit also includes a temperature control system for real-time monitoring and adjusting the temperature of the reaction liquid; wherein the temperature control system includes a temperature sensor and a controller, the temperature sensor is provided on the reaction tank body 6, for real-time monitoring of the temperature of the reaction liquid, and the temperature sensor is connected to the controller signal, capable of transmitting the monitored temperature data to the controller, the controller is also connected to the electric heating tube signal, and can adjust the heating temperature of the electric heating tube in real time according to the temperature data monitored by the temperature sensor. Wherein, the reaction tank body 6 is also provided with a monitoring port 7 for connecting a temperature sensor for monitoring.

[0068] In this embodiment, the exhaust port 5 of the reaction tank body 6 is also connected to a waste gas treatment device through an exhaust pipe, and the waste gas treatment device is used to treat volatile organic compounds (VOCs) and alkaline gases generated during the reaction process; wherein, the waste gas treatment device can be selected according to specific work needs. As a preferred embodiment, the waste gas treatment device includes a condensation recovery device, an activated carbon adsorption tower and an alkali liquid absorption tower connected in sequence, which are used to treat volatile organic compounds and alkaline gases generated during the reaction process, and the exhaust pipe is connected to a fan to maintain a negative pressure state to prevent exhaust gas leakage and ensure that the exhaust gas meets environmental protection standards.

[0069] The operating parameters of the reaction unit in this embodiment are: sodium hydroxide solution concentration: 5%-10% (mass fraction); reaction temperature: 60-80°C; reaction time: 1-2 hours; stirring speed: 60-120 rpm; liquid-to-solid ratio: the mass ratio of sodium hydroxide solution to paint bucket fragments is 5:1 to 10:1; the above operating parameters are the optimal reaction range, and operating within this range can improve the reaction rate, reaction effect, etc.

[0070] In this embodiment, the reaction unit is combined with the design of the exhaust gas treatment device, which can not only effectively remove the paint coating, but also avoid the pollution of volatile organic compounds (VOCs) to the environment; the temperature control system monitors and adjusts the reaction temperature in real time to ensure stable reaction conditions and improve the removal efficiency of the paint coating.

[0071] In this embodiment, the cleaning unit mainly includes a vibrating screening machine and a spray system 25. The vibrating screening machine includes a screen 21, a vibration motor 22 and a fixed frame 23. The screen 21 is arranged on the fixed frame 23. The vibration motor 22 is used to drive the screen 21 to vibrate. The screen 21 is made of corrosion-resistant material (stainless steel 304) and the aperture of the screen 21 is 2-5 mm; the spray system 25 is installed on the upper part of the vibrating screening machine, including multiple high-pressure fan-shaped nozzles, and adopts a fan-shaped spray design to ensure that the cleaning water covers the entire surface of the screen 21. A wastewater collection tank is also provided at the bottom of the vibrating screening machine for collecting alkaline wastewater generated during the cleaning process and transporting it to the post-processing unit for precipitation and recycling, ensuring that there is no residual sodium hydroxide on the surface of the cleaned fragments to meet the requirements of subsequent metal recovery or reuse.

[0072] The operating parameters of the cleaning unit in this embodiment are: vibration frequency of the screen 21: 50-60 Hz; amplitude: 2-5 mm; spray water pressure: 0.2-0.5 MPa; spray water flow rate: 5-10 L / min; cleaning time: 5-10 minutes.

[0073] In this embodiment, a vibrating screening machine combined with a spraying system is used to efficiently clean the residual liquid on the surface of the fragments. The recovered metal fragments can be used for reuse, thereby achieving efficient recycling of resources. At the same time, wastewater can be collected and recycled, and the wastewater collection tank is connected to the post-processing unit, thereby achieving resource utilization of wastewater.

[0074] In this embodiment, the post-processing unit mainly includes a sedimentation tank and a dehydration device. The sedimentation tank is made of corrosion-resistant material and is provided with a diversion device inside. The diversion device can be selected according to specific work needs. For example, the diversion device can include multiple baffles. The multiple baffles are arranged in a staggered vertical layout and installed at intervals along the water flow direction (the spacing is 1 / 2 of the pool width). The height is 80% of the pool depth and the bottom is suspended 30-50 cm, forcing the wastewater to flow back and forth multiple times, extending the residence time to more than 24 hours; the bottom of the sedimentation tank is designed to be a conical or inclined structure to extend the liquid residence time and improve the sedimentation efficiency, so as to facilitate the centralized collection of the sediment. A supernatant outlet is provided at the top of the sedimentation tank, and the supernatant outlet is connected to the reaction unit through a return pipe, and a return pump is provided on the return pipe; the reacted mixed liquid and the cleaning wastewater are left to stand in the sedimentation tank for 24 hours, and the supernatant is returned to the reaction unit for reuse, reducing the consumption of chemical reagents, and the sediment is dehydrated and then transported for treatment. The supernatant is returned to the reaction unit through a return pump, with a return ratio of 80%-90%. The return pipe is connected to a filter device to remove tiny suspended solids before returning to ensure the quality of the recycled liquid.

[0075] In this embodiment, the dehydration device uses a belt filter press, and the moisture content of the solids after dehydration is reduced to ≤30%. The solid residue after dehydration must be properly packaged and labeled with its composition information to facilitate delivery to a professional organization for incineration, landfill, or resource utilization.

[0076] The operating parameters of the post-processing unit in this embodiment are: sedimentation time: more than 24 hours; sedimentation tank volume: 1.5-2 times the daily processing capacity; dehydration method: belt filter press: operating speed is 1-3m / min, dehydration time is 10-20 minutes; solid moisture content after dehydration: ≤30%.

[0077] In this embodiment, the wastewater after cleaning can be recycled after sedimentation treatment, which reduces the waste of water resources; the moisture content of the sediment is reduced after dehydration, which is convenient for external transportation and treatment, avoiding secondary pollution.

[0078] This embodiment also provides a method for recycling and utilizing waste paint cans, which is implemented using the waste paint can recycling and utilizing system described above and mainly includes the following steps:

[0079] S1, crushing the waste paint bucket by the crushing unit to obtain paint bucket fragments;

[0080] S2, placing the paint bucket fragments into the reaction tank 6, and fully mixing them with the reaction liquid to peel off the paint coating;

[0081] S3, cleaning the paint bucket fragments after the reaction is completed by the cleaning unit;

[0082] S4. Treating the mixed liquid generated after the reaction in the reaction unit and the cleaning wastewater generated by the cleaning unit through the post-treatment unit.

[0083] In this embodiment, from crushing to post-processing, each unit is closely connected to form a complete waste paint can recycling process, which solves the problems of low efficiency and high cost of a single link in the existing technology; moreover, the introduction of exhaust gas treatment equipment and wastewater recycling system significantly reduces the impact of the process on the environment, and the reduction of solid waste is achieved through the dehydration device, further improving the resource recovery rate; the combined use of the double-shaft crusher, trough reactor, vibrating screening machine and dehydration device reflects the high matching of equipment and process, ensuring the efficiency and economy of the process.

[0084] The waste paint barrel recycling and processing system and method in this embodiment are applicable to various types of waste paint barrels (such as iron barrels, aluminum barrels, etc.), and have strong versatility and industrial application prospects.

[0085] Example 2

[0086] In this embodiment, the method for recycling and treating waste paint barrels is described in detail as follows:

[0087] Waste paint cans are fed into a dual-shaft crusher, shredded at a rotary blade speed of 100 rpm and a feed rate of 800 kg / h. The average crushing time for a single waste paint can is 15 seconds, yielding uniform fragments measuring 5 cm x 10 cm. The fragments are then mixed with a 5% sodium hydroxide solution and subjected to a hot alkaline reaction in a tank reactor. The reaction temperature is controlled at 80°C, the stirring speed is 100 rpm, and the reaction time is 1.5 hours. Exhaust gases generated during the reaction are purified through an activated carbon adsorption tower before being discharged. After the reaction, the fragments are transferred to a vibrating screening machine and cleaned through a spray system with a water pressure of 0.3 MPa, a water flow rate of 8 L / min, and a cleaning time of 8 minutes. The cleaned wastewater is then transferred to a wastewater collection tank. The cleaned wastewater is then transferred to a sedimentation tank for 24 hours. The supernatant is then returned to the reaction unit for reuse. The precipitate is dehydrated through a belt filter press, reducing the moisture content of the solid residue to 30%, making it easier to transport and dispose of. After testing, the paint coating removal rate reached more than 99%, the cleaned fragments can be used for metal recovery, and the supernatant reflux ratio is 85%, which significantly improves the utilization rate of water resources and chemical reagents.

[0088] In addition, the costing is as follows:

[0089] 1,000 waste paint cans are processed daily, with a recycling price of approximately 6 yuan per can. The average energy consumption per can is approximately 1.5 kWh, and each can consume approximately 0.2 kg of sodium hydroxide. Therefore, this process has considerable economic value and can effectively alleviate the environmental pollution caused by waste paint cans.

[0090] The present invention uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only intended to help understand the method and core concept of the present invention. At the same time, those skilled in the art will find that the specific implementation methods and application scopes may vary based on the concept of the present invention. In summary, the contents of this specification should not be construed as limiting the present invention.

Claims

1. A waste paint barrel recycling and processing system, characterized by: include: A crushing unit, which is used to crush the waste paint cans to obtain paint can fragments; A reaction unit, the reaction unit comprising a reaction tank body, wherein a reaction liquid can be placed in the reaction tank body, and the reaction liquid can remove the paint coating on the paint bucket fragments; a cleaning unit, the cleaning unit being used to clean the paint bucket fragments; A post-processing unit is provided, wherein the post-processing unit is capable of processing the mixed liquid generated after the reaction of the reaction unit and the cleaning wastewater generated by the cleaning unit.

2. The waste paint barrel recycling and processing system according to claim 1 is characterized in that: The crushing unit is a double-shaft crusher, which includes a crushing shell, a rotating cutter shaft is rotatably arranged in the crushing shell, and the rotating cutter shaft is connected to a first drive motor, which can drive the rotating cutter shaft to rotate to crush the waste paint cans; There are two parallel rotating blade shafts, each of which is provided with a plurality of crushing blades, and the crushing blades on the two rotating blade shafts are arranged in a staggered manner; A screen is also provided at the bottom of the crushing shell, and screen holes are provided on the screen.

3. The waste paint barrel recycling and processing system according to claim 2 is characterized in that: The double-shaft crusher also has an automatic reversal function. When it is detected that the rotating cutter shaft is stuck, the double-shaft crusher automatically rotates in the opposite direction.

4. The waste paint barrel recycling and processing system according to claim 1 is characterized in that: The reaction tank body is arranged on a fixed bracket, the top of the reaction tank body is provided with a feed port and an exhaust port, the bottom is provided with a discharge port, and the exhaust port is also connected to an exhaust gas treatment device through an exhaust pipe, and the exhaust gas treatment device is used to treat the exhaust gas generated during the reaction process; Wherein, the waste gas treatment device includes a condensation recovery device, an activated carbon adsorption tower and an alkali solution absorption tower which are connected in sequence, and the exhaust pipe is connected to a fan.

5. The waste paint barrel recycling and processing system according to claim 1 is characterized in that: The reaction tank is further provided with a stirring device, which is a paddle stirrer, including a second drive motor, a second reducer, a transmission shaft and a stirring blade. The output shaft of the second drive motor is connected to the transmission shaft through the second reducer. The transmission shaft is provided with a stirring blade, and the stirring blade can be driven to rotate by the second drive motor; Wherein, the surface of the stirring blade is coated with polytetrafluoroethylene coating.

6. The waste paint barrel recycling and processing system according to claim 1 is characterized in that: The reaction unit also includes a heating device for heating the reaction liquid; wherein the heating device is a heating jacket, the heating jacket is wrapped around the outside of the reaction tank body, and an electric heating tube is provided in the heating jacket, and an insulation layer is also provided on the outside of the heating jacket.

7. The waste paint barrel recycling and processing system according to claim 6 is characterized in that: The reaction unit also includes a temperature control system, which is used to monitor and adjust the temperature of the reaction liquid in real time; wherein, the temperature control system includes a temperature sensor and a controller, the temperature sensor is arranged on the reaction tank body, and is used to monitor the temperature of the reaction liquid in real time, and the temperature sensor is connected to the controller signal and can transmit the monitored temperature data to the controller, and the controller is also connected to the electric heating tube signal and can adjust the heating temperature of the electric heating tube in real time according to the temperature data monitored by the temperature sensor.

8. The waste paint barrel recycling and processing system according to claim 1 is characterized in that: The cleaning unit includes a vibrating screening machine and a spray system. The vibrating screening machine includes a screen, a vibrating motor and a fixed frame. The screen is arranged on the fixed frame. The vibrating motor is used to drive the screen to vibrate. The spray system is installed on the upper part of the vibrating screening machine and includes a plurality of high-pressure fan-shaped nozzles. The high-pressure fan-shaped nozzles are connected to a cleaning liquid inlet pipe for introducing cleaning liquid. A wastewater collection tank is also provided at the bottom of the vibrating screening machine, and the wastewater collection tank is connected to the post-processing unit.

9. The waste paint barrel recycling and processing system according to claim 1 is characterized in that: The post-processing unit includes a sedimentation tank and a dehydration device. The sedimentation tank is provided with a flow guide device, and the bottom is a conical or inclined structure. The top of the sedimentation tank is provided with a supernatant outlet, and the supernatant outlet is connected to the reaction unit through a return pipe. The return pipe is also provided with a filter device and a return pump. The dehydration device adopts a belt filter press.

10. A method for recycling and utilizing waste paint barrels, characterized by: The waste paint barrel recycling and treatment system according to any one of claims 1 to 9 is implemented, comprising the steps of: S1, crushing the waste paint bucket by the crushing unit to obtain paint bucket fragments; S2, placing the paint bucket fragments into the reaction tank, and fully mixing them with the reaction liquid to peel off the paint coating; S3, cleaning the paint bucket fragments after the reaction is completed by the cleaning unit; S4. Treating the mixed liquid generated after the reaction in the reaction unit and the cleaning wastewater generated by the cleaning unit through the post-treatment unit.

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