A self-circulation C f / Mg composite material recycling device and method thereof

Abstract

The application discloses a self-circulation C f / Mg composite material recycling device and method, belonging to the field of material recycling; including an electrochemical reaction module, a heating and stirring module connected with the electrochemical reaction module, and a recycling module; the electrochemical reaction is accelerated through the heating and stirring module, and the electrolyte is automatically circulated and filtered through the recycling module, so that the electrolyte concentration is stable and the recovery rate is ensured; the electrochemical reaction module comprises a recycling pool containing electrolyte and a reaction piece arranged in the recycling pool; the reaction piece comprises a recycling piece connected with a positive electrode of a power supply and a carbon steel plate connected with a negative electrode of the power supply; the recycling module filters and recycles the electrolyte after reaction, and circulates the filtered electrolyte to the recycling pool again, so as to be continuously recycled. The application can recycle at room temperature, avoids the risk of flammability and explosion of magnesium alloy in a high-temperature environment, reduces energy consumption while ensuring the recovery rate, and realizes green and environment-friendly recycling.

Description

TECHNICAL FIELD

[0001] The application belongs to the field of material recycling, and particularly relates to a self-circulating C f / Mg composite material recycling device and method. BACKGROUND

[0002] With the rapid development of China's scientific and technological strength, various high-end equipment require materials to be more strong, more solid and more light. C f / Mg composite material has low density, high specific strength, high specific stiffness, good damping performance and excellent processing performance, and shows important application prospects. However, there is a large potential difference between magnesium and carbon fibers, C f / Mg composite material is prone to corrosion in actual use, which leads to overload of the part, thereby shortening the service life of the equipment. In addition, the high cost of carbon fibers leads to C f / Mg composite material is relatively high in price, which limits its further development. Therefore, a method for recycling carbon fibers and magnesium in C f / Mg composite material is needed, which can be used to recycle carbon fibers and magnesium matrix after the composite material cannot work due to corrosion, and then prepare the composite material again, improve the use efficiency of C f / Mg composite material, and thus improve the economy and sustainability.

[0003] Currently, the research on the recycling of carbon fibers mainly focuses on carbon fiber reinforced resin-based (CFRP) materials, and a pyrolysis method is used to extract carbon fibers by heating CFRP at high temperature to gasify and decompose the matrix resin. However, the gasification temperature of the alloy is much higher than that of the resin material, which increases the difficulty and cost of recycling. In addition, magnesium alloy is flammable and explosive, and high-temperature recycling is dangerous. The existing technology proposes an electrochemical recycling device for resin-based composite materials, which builds a normal-temperature recycling system and effectively reduces energy consumption. In addition, high-temperature gasification is avoided in the recycling process, which reduces the possibility of environmental pollution caused by gas volatilization; the method generates continuous electrolysis products during the recycling process, which affects the concentration of the electrolyte, resulting in too low actual recycling efficiency and failing to meet the industrial application requirements.

[0004] Therefore, there is a lack of related technology for recycling carbon fibers and magnesium alloy in C f / Mg composite material in the current disclosed technology, and the application designs a self-circulating C f / Mg composite material recycling device based on thermoelectric synergy. SUMMARY

[0005] The technical problem to be solved is:

[0006] In order to avoid the shortcomings of the prior art, the application provides a self-circulating Cf The application discloses a recycling device and method for Mg / Mg composite materials, which accelerates molecular movement in a reaction process in a thermoelectric cooperative manner, realizes automatic circulation and filtration of electrolyte through self-circulation, can be used at normal temperature, avoids the risk of flammability and explosiveness of magnesium alloy in a high-temperature environment, reduces energy consumption while ensuring a recycling rate, and realizes green and environment-friendly recycling.

[0007] The technical scheme of the application is as follows: a self-circulation C f The recycling device for Mg / Mg composite materials comprises an electrochemical reaction module, a heating and stirring module connected with the electrochemical reaction module, and a recycling module connected with the heating and stirring module, accelerates electrochemical reaction through the heating and stirring module, realizes automatic circulation and filtration of electrolyte through the recycling module, and ensures stable electrolyte concentration and a recycling rate.

[0008] The electrochemical reaction module comprises a recycling pool containing electrolyte and a reaction piece arranged in the recycling pool, and the reaction piece comprises a recycling piece connected with a positive pole of a power supply and a carbon steel plate connected with a negative pole of the power supply.

[0009] The recycling module filters and recycles electrolyte after reaction, and circulates the filtered electrolyte to the recycling pool again, so that the electrolyte can be continuously recycled.

[0010] Further technical schemes of the application are as follows: the electrochemical reaction module further comprises a liquid preparation pool arranged above the recycling pool, a water level sensor and a thermometer arranged in the recycling pool, the bottom of the liquid preparation pool is connected with the recycling pool, the opening and closing and the flow of electrolyte are controlled through an electromagnetic valve arranged at the bottom, the water level and temperature information of the electrolyte in the recycling pool are obtained through the water level sensor and the thermometer, and are sent to an industrial computer; the top of the liquid preparation pool is provided with a deionized water inlet for supplementing water evaporated in the heating reaction, so that the concentration of the electrolyte is kept unchanged.

[0011] Further technical schemes of the application are as follows: the top of the recycling pool is packaged with a fixed baffle, the recycling piece and the carbon steel plate are respectively arranged below the fixed baffle and extend into the electrolyte in the recycling pool through clamps, and a filter net bag is arranged on the outer periphery of the recycling piece.

[0012] Further technical schemes of the application are as follows: the heating and stirring module comprises a rotor arranged in the recycling pool and a magnetic heating base arranged below the rotor, the rotor is magnetically adsorbed to the bottom surface in the recycling pool, the magnetic heating base heats the electrolyte in the recycling pool and provides rotating power for the rotor.

[0013] A further technical solution of the application is that the recycling module comprises a suction filter bottle, a filter screen and filter paper placed in the suction filter bottle, a two-way water pump and a vacuum pump in communication with the suction filter bottle; the two-way water pump is in communication between the suction filter bottle and the electrochemical reaction module, can pump the reacted electrolyte in the recycling tank into the suction filter bottle, filter the electrolyte through the filter paper placed in the suction filter bottle and the filter screen below the water inlet, and then pump the filtered electrolyte into the liquid preparation tank; the vacuum pump is used to provide a low-pressure environment for the suction filter bottle.

[0014] A further technical solution of the application is that the two-way water pump comprises two water inlets and two water outlets, the first water inlet is in communication with the bottom of the recycling tank through a rubber tube, the first water outlet is in communication with the water inlet of the suction filter bottle through a rubber tube, the second water inlet is in communication with the bottom of the suction filter bottle through a rubber tube, and the second water outlet is in communication with the liquid preparation tank through a rubber tube; liquid can be transported from the first inlet to the first outlet and from the second inlet to the second outlet.

[0015] A further technical solution of the application is that it further comprises an industrial computer, which is connected with the electromagnetic valve, the power supply, the water level sensor, the thermometer, the magnetic heating base, the two-way water pump and the vacuum pump; the industrial computer displays the information sent by the water level sensor and the thermometer, so that the operator can observe in real time and adjust the control of the magnetic heating base and the electromagnetic valve; the industrial computer controls the output voltage of the power supply to meet the requirements of the reaction conditions.

[0016] A self-circulating C f / Mg composite material recycling method based on thermoelectric cooperation, the specific steps are as follows:

[0017] According to the structure of the self-circulating C f / Mg composite material recycling device based on thermoelectric cooperation, each component is installed;

[0018] The electrolyte is injected into the suction filter bottle, and then the electrolyte is injected into the recycling tank to the required water level by opening the electromagnetic valve, and the electromagnetic valve is closed;

[0019] Start the magnetic heating base and the power supply, adjust the working parameters, and start the reaction;

[0020] After the reaction continues for 3-5 minutes, start the two-way water pump for recycling, and set the timing switch parameters to work for 30-60 seconds and then pause for 5-10 minutes for continuous recycling;

[0021] Turn on the vacuum pump to provide a continuous low-pressure environment for the reaction process;

[0022] Repeat the above reaction and recycling steps until the recycling is completed;

[0023] After the recovery process is completed, the filter screen and filter paper are taken out, and the carbon fiber debris and magnesium hydroxide precipitate are recovered therefrom; the fixed baffle is opened, the recovery piece is taken out and the filter screen pocket is peeled off, and the carbon fiber in the recovery piece is taken out for pickling, i.e., the recovery is completed.

[0024] A further technical solution of the present application is that the working parameters of the magnetic heating base and the power supply are that the rotating speed is in the range of 500-1500 rpm, the temperature is in the range of 30-100 DEG C, and the power supply voltage is in the range of 1-10 V.

[0025] A further technical solution of the present application is that the reaction process is that after the power supply is turned on, the reaction occurs in the recovery tank, and the magnesium in the composite material recovery piece is electrolyzed to generate white magnesium hydroxide precipitate; after the reaction lasts for 3-5 minutes, the electrolyte after the reaction is introduced into the suction filter bottle by the bidirectional water pump; the carbon fiber debris remaining in the electrolyte is intercepted by the filter screen, and then the magnesium hydroxide precipitate in the electrolyte is filtered by the suction filtration mode, so that the separation of the recovery products is realized; the filtered electrolyte is re-injected into the liquid preparation tank under the action of the bidirectional water pump, so that the circulation of the electrolyte is realized; and the electrolyte is a sodium chloride solution with a concentration of 2.5%.

[0026] Beneficial effects

[0027] The present application has the beneficial effects that the present application proposes a C f / Mg composite material self-circulation recovery device has the advantages of safety and stability, green environmental protection and low energy consumption. In addition, the geometric shape and size of the recovered sample are less limited, and the application is wide; the heat field and the power field are introduced in the conventional electrochemical recovery method, the heat and electricity are cooperated, the recovery efficiency of the C f / Mg composite material is significantly improved; by introducing the filtration system, the circulation of the electrolyte is realized, the influence of the electrolytic product and the carbon fiber falling off in the reaction process on the recovery process is effectively prevented, and the subsequent recovery efficiency is improved; under low power, magnesium hydroxide adheres to the surface of the carbon fiber, which causes the slow recovery rate, under high power, the surface of the carbon fiber is damaged, which causes the recovery rate to decrease, when the voltage is 2.5 V, the magnesium hydroxide on the surface of the carbon fiber can be dispersed to improve the recovery efficiency, and the damage to the carbon fiber is small to ensure the stability of the recovery rate. The specific advantages are analyzed as follows:

[0028] 1. Safety and stability, green environmental protection; the normal temperature electrochemical recovery is adopted, the high temperature safety hazard is avoided, and the gas volatilization polluting the environment is reduced. A mild heat field (30-100 DEG C) is provided by the magnetic heating base, and the self-circulation system is combined, so that the low-energy, low-emission green recovery process is realized.

[0029] 2. High efficiency recovery and low energy consumption; accelerate molecular movement through thermoelectricity synergy (thermal power + power), significantly improve reaction rate; maintain stable concentration through electrolyte self-circulation and filtration system, recovery efficiency up to 93%-97%. Two-way water pump and vacuum pump realize automatic circulation and filtration of electrolyte, industrial computer accurately controls voltage (2.5V optimal value), which disperses magnesium hydroxide on the surface of carbon fiber and avoids fiber damage.

[0030] 3. Wide applicability; through the design of clamp and filter screen, it can adapt to different shapes of recycled parts and be suitable for Cf / Mg composite materials with complex geometric structure. Modular design (electrochemical reaction module + recycling module) can flexibly meet various recycling needs.

[0031] 4. Automation control and simple operation; through integrated control of industrial computer (solenoid valve, temperature, water level, water pump, etc.), realize full-process automation, improve operation precision and stability. Real-time monitoring of electrolyte water level and temperature, dynamic adjustment of parameters to ensure continuous and stable operation of the recycling process.

[0032] 5. High-value utilization of products; through filtration and pickling process, carbon fiber and magnesium hydroxide precipitate are separated, carbon fiber can be reused, and magnesium hydroxide can be used as flame retardant, desulfurizer, etc., to improve economic efficiency. Filter screen in suction filter bottle intercepts debris, and two-way water pump realizes efficient separation of solid and liquid.

[0033] 6. Low cost and sustainability; reduce energy consumption through normal temperature electrochemical recycling; reduce raw material waste by recycling electrolyte, further reduce cost. 2.5% sodium chloride solution as electrolyte, material easy to obtain and no regulation chemicals, meet the needs of sustainable development.

[0034] 7. Corrosion prevention and prolonging material life; Cf / Mg composite materials are prone to corrosion due to potential difference, recycling can regenerate materials, reduce resource waste and prolong the life cycle of composite materials. The recycled carbon fiber has performance close to the original fiber after pickling and can be directly used for new composite material preparation.

[0035] The present application solves the problems of safety, efficiency and economy in the recycling of Cf / Mg composite materials through thermoelectricity synergy to accelerate reaction, electrolyte self-circulation to stabilize concentration, automation control to improve efficiency and high-value utilization of products, which has environmental protection, universality and industrialization potential, and provides technical support for sustainable application of lightweight materials. BRIEF DESCRIPTION OF DRAWINGS

[0036] Figure 1 is the structure diagram of the Cf / Mg composite material self-circulation recycling device based on thermoelectricity synergy in the embodiment of the present application. f / Mg composite material self-circulation recycling device based on thermoelectricity synergy in the embodiment of the present application.

[0037] Figure 2 isFigure 1 Internal schematic view of the intermediate liquid preparation tank.

[0038] Figure 3 Is Figure 1 Schematic view of the clamping state of the clamp.

[0039] Figure 4 Is the topography diagram before and after recovery, (a) before recovery, (b) after recovery.

[0040] Figure 5 Is the micrograph of the carbon fiber after recovery under different voltages, (a) 0V, (b) 2.5V, (c) 3V.

[0041] Figure 6 Is the recovery rate under different voltages.

[0042] Figure 7 Is the micrograph of the carbon fiber after recovery, (a) before pickling, (b) after pickling.

[0043] BRIEF DESCRIPTION OF DRAWINGS: 1, liquid preparation tank, 2, rubber tube, 3, support, 4, electromagnetic valve, 5, wire, 6, DC power supply, 7, data line, 8, industrial computer, 9, clamp, 10, fixed baffle, 11, water level sensor, 12, recovery part, 13, carbon steel plate, 14, thermometer, 15, filter screen pocket, 16, rotor, 17, recovery tank, 18, magnetic heating base, 19, two-way water pump, 20, filter screen, 21, suction filter bottle, 22, vacuum pump. DETAILED DESCRIPTION

[0044] The embodiments described below with reference to the drawings are exemplary and are intended to explain the present application, and cannot be understood as a limitation of the present application.

[0045] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application.

[0046] Based on the current carbon fiber recovery method and magnesium alloy recovery method, the C f / Mg composite material cannot be recovered, and in the recovery process, problems such as high cost, unstable electrolyte concentration, high-temperature recovery flammability and explosiveness may occur, the present application provides a self-circulating C fThe application discloses a recycling device for Mg / Mg composite materials, which comprises an electrochemical reaction module and a heating and stirring module and a circulating recycling module connected with the electrochemical reaction module.

[0047] The heating and stirring module of the device is a magnetic heating base built recycling module, which introduces power and heat into the electrochemical recycling process, accelerates molecular movement and improves recycling efficiency. The recycling method using the device does not need to build a high-temperature environment in the recycling process, avoids combustion and explosion generated in the magnesium alloy gasification process, reduces the recycling cost, prevents environmental pollution caused by gas evaporation, effectively improves the working efficiency, realizes large-scale recycling, reduces the recycling cost and realizes green recycling.

[0048] The above technical solutions are further analyzed in combination with the drawings:

[0049] In one embodiment, referring to Figure 1 The application discloses a recycling device for Mg / Mg composite materials, which comprises an electrochemical reaction module and a heating and stirring module and a circulating recycling module connected with the electrochemical reaction module. fA recovery device for the reinforcing phase and matrix material of Mg composite materials includes a solution tank 1, a rubber tube 2, a support 3, a solenoid valve 4, a wire 5, a DC power supply 6, a data cable 7, an industrial control computer 8, a clamp 9, a fixing baffle 10, a water level sensor 11, a recovery component 12, a carbon steel plate 13, a thermometer 14, a filter screen 15, a rotor 16, a recovery tank 17, a magnetic heating base 18, a bidirectional water pump 19, a filter screen 20, a filtration flask 21, and a vacuum pump 22. The solution tank 1 is fixed on the support 3, sealed by the fixing baffle 10, and deionized water is introduced from the side through an external rubber tube 2. A solenoid valve 4 is installed at the lower end. The recovery tank 17 is placed in a magnetic heating base. The magnetic heating base 18 is positioned above the liquid preparation tank 1 and below it. The bottom of the liquid preparation tank 1 passes through the fixed baffle 10 and enters the interior of the recovery tank 17. The magnetic heating base 18 is connected to the industrial control computer 8 via a data cable 7 to control the temperature and power during the reaction process. The water level sensor 11 is attached to the upper part of the inner wall of the recovery tank 17, and the thermometer 14 is suspended inside the recovery tank 17. The thermometer 14 is connected to the industrial control computer 8 via a data cable 7 to display the data of the water level sensor 11 and the thermometer 14 and to observe them in real time. The rotor 16 is magnetically attached to the bottom of the recovery tank 17. The power supply 6 is placed on the left side of the recovery tank 17 and is connected to the industrial control computer 8 via a data cable 7. Two wires 5 are led out from the positive and negative terminals of the power supply and connected to the clamp 9. The positive terminal clamps the recovery component 12, and the negative terminal clamps the carbon steel plate 13. The filter bag 15 is placed on the outside of the recovery component 12. The suction flask 21 is located on the right side of the recovery tank 17, and the filter screen 20 is placed below the inlet of the suction flask 21. The bottom of the recovery tank 17 has an outlet, and the rubber tube 2 is connected to the lower interface of the bidirectional water pump 19. The bidirectional water pump 19 controls the liquid flow, and the upper interface of the bidirectional water pump 19 is connected to the suction flask 21 through the rubber tube 2. The vacuum pump 22 is located on the right side of the suction flask 21 and is connected to the suction flask 21 through the rubber tube 2 to provide a low-pressure environment inside it. The bottom of the suction flask 21 has an outlet, which is connected to the lower interface of the bidirectional water pump 19 through the rubber tube 2, and then connected to the upper interface to the solution tank 1 to realize the circulation of electrolyte.

[0050] In one embodiment, a C f / Mg composite material carbon fiber and magnesium alloy recycling method, using AZ91D magnesium alloy and Taili T700 carbon fiber preform.

[0051] Step 1: Preparation of recovered sample and electrolyte. C f Mg composite material and carbon steel were cut into 3×3×1 cm pieces by wire cutting. 3 The sample was cleaned of its oxide film using 80-grit sandpaper. The recycled part 12 and the carbon steel plate 13 were then secured to the bottom of two clamps 9 using screws. f Place a filter mesh bag 15 over the Mg composite material. Prepare a 2.5% sodium chloride solution.

[0052] Step two: installation of the recovery device. Fix the recovery piece 12, carbon steel plate 13, temperature sensor 14 and the solution mixing pool 1 on the fixed baffle 10, then install the fixed baffle 10 on the upper end of the recovery pool 17. Connect the recovery piece 12 and the carbon steel plate 13 to the positive and negative poles of the power supply 6 respectively; connect the electromagnetic valve 4, the power supply 6, the water level sensor 11, the temperature sensor 14, the water pump 19 and the vacuum pump 21 to the industrial control device 8 through the data line 7; connect the water outlet at the bottom of the recovery pool 17 and the water outlet at the bottom of the filter bottle 21 to the water inlet of the two-way water pump 19 through the rubber pipe 2 respectively, and connect the water inlets at the top of the solution mixing pool 1 and the filter bottle 21 to the water outlets of the two-way water pump 19 through the rubber pipe 2 respectively. Put the filter paper into the filter bottle 21 and fix it with the clamp, and place the filter screen 20 below the water inlet of the filter bottle 21;

[0053] Step three: setting of the recovery device. Use the industrial control computer 8 to set the program to open the electromagnetic valve 4 and the water level sensor 11, and when the water level reaches the position of the water level sensor 11, close the electromagnetic valve 4 to stop water injection. Start the magnetic heating base 18, set the rotating speed at 1000 rpm and the temperature at 50℃. Turn on the power supply 6, fix the current parameter, and adjust the voltage parameter to 5V. After 5 minutes of reaction, start the two-way water pump 19 and set the timing switch parameter to pause for 10 minutes and work for 60 seconds. Turn on the vacuum pump 22 and set the time to 3 minutes, then turn off the vacuum pump and the two-way water pump 19. Repeat the above steps, use the electromagnetic valve 4, the two-way water pump 19 and the vacuum pump 22 for 50 times to realize the circulation of the electrolyte; when it is detected that the liquid level cannot reach the water level sensor 11, open the electromagnetic valve 4 to introduce new deionized water through the rubber pipe 2;

[0054] Step four: material recovery process. Use the industrial control computer 8 to close the electromagnetic valve 4 and the two-way water pump 19; inject electrolyte into the solution mixing pool 1; use the industrial control computer 8 to run the program to inject the sodium chloride solution in the solution mixing pool 1 into the recovery pool 17; the magnetic heating base 18 drives the rotor 16 to rotate, making the electrolyte flow; after the power supply 6 is turned on, the reaction occurs in the recovery pool 17, and the magnesium in the composite material is electrolyzed to generate white magnesium hydroxide precipitate; after 5 minutes of reaction, the reacted electrolyte is introduced into the filter bottle 21; the filter screen 20 can intercept the residual carbon fiber debris in the electrolyte, and then the magnesium hydroxide precipitate in the electrolyte is filtered by filtration, realizing the separation of the recovered product; the filtered electrolyte flows back into the solution mixing pool 1 under the action of the two-way water pump 19, realizing the circulation of the electrolyte;

[0055] Step five: cleaning and recycling of the recovered material. After 2 days, the recovery process is completed, the filter screen 20 and filter paper are removed, and the carbon fiber debris and magnesium hydroxide precipitate are recovered; the fixed baffle is opened, the recovery part 12 is removed, and the filter screen pocket 15 is peeled off, and the carbon fiber in the recovery part 12 is taken out for acid washing, and the recovery rate reaches 93%. If necessary, the carbon fiber can be crushed by ball milling for further application. In addition, the recovered magnesium hydroxide precipitate can be used as a flame retardant, a desulfurizer, and a neutralizing agent, etc., for further application.

[0056] In one embodiment, a C f / Mg composite material carbon fiber and magnesium alloy recovery method, AZ31B magnesium alloy is selected, and Toray T700 carbon fiber preform is selected. The recovery rate reaches 95%.

[0057] In one embodiment, a C f / Mg composite material carbon fiber and magnesium alloy recovery method, AZ31B magnesium alloy is selected, and Toray T700 carbon fiber preform is selected. The recovery rate reaches 95%.

[0058] Although the embodiments of the present application have been shown and described above, it should be understood that the above-described embodiments are exemplary and are not to be construed as limiting the present application, and those of ordinary skill in the art can make changes, modifications, replacements, and variations to the above-described embodiments without departing from the principles and purposes of the present application within the scope of the present application.

Claims

1. A self-circulating C f / Mg composite material recovery device based on thermoelectric synergy, characterized by: The electrochemical reaction module comprises a recovery tank containing electrolyte and a reaction piece arranged in the recovery tank, the reaction piece comprises a recovery piece connected to a positive pole of a power supply and a carbon steel plate connected to a negative pole of the power supply, and a filter screen is sleeved on the outer periphery of the recovery piece; the electrochemical reaction module further comprises a liquid preparation tank arranged above the recovery tank, the bottom of the liquid preparation tank is connected to the recovery tank, and the top of the liquid preparation tank is provided with a deionized water inlet for supplementing water evaporated in the heating reaction to keep the concentration of the electrolyte unchanged; The electrolyte after the reaction is filtered and recovered, and the filtered electrolyte is recycled to the recovery tank for continuous recycling; the recycling module comprises a filter bottle, a filter screen and filter paper arranged in the filter bottle, a double-way water pump and a vacuum pump connected to the filter bottle; the double-way water pump is connected between the filter bottle and the electrochemical reaction module, can draw the electrolyte after the reaction in the recovery tank into the filter bottle, filter the electrolyte through the filter paper and the filter screen below the water inlet in the filter bottle, and then draw the filtered electrolyte into the liquid preparation tank; the vacuum pump is used to provide a low-pressure environment for the filter bottle. The electrochemical reaction module further comprises a water level sensor and a thermometer arranged in the recovery tank, the electromagnetic valve arranged at the bottom of the liquid preparation tank is used to control the on-off and flow of the electrolyte, the water level and temperature of the electrolyte in the recovery tank are obtained through the water level sensor and the thermometer, and the information is sent to the industrial computer.

2. The self-circulation C f / Mg composite material recycling device according to claim 1, characterized in that: The top of the recovery tank is packaged with a fixed baffle, the recovery piece and the carbon steel plate are respectively installed below the fixed baffle and extend into the electrolyte in the recovery tank.

3. The self-circulation C f / Mg composite material recycling device according to claim 2, characterized in that: The heating and stirring module comprises a rotor arranged in the recovery tank and a magnetic heating base arranged below the rotor, the rotor is magnetically adsorbed to the bottom surface in the recovery tank, the magnetic heating base heats the electrolyte in the recovery tank and provides the rotation power of the rotor.

4. The self-circulation C f / Mg composite material recycling device according to claim 3, characterized in that: The double-way water pump comprises two water inlets and two water outlets, the first water inlet is connected to the bottom of the recovery tank through a rubber pipe, the first water outlet is connected to the water inlet of the filter bottle through a rubber pipe, the second water inlet is connected to the bottom of the filter bottle through a rubber pipe, and the second water outlet is connected to the liquid preparation tank through a rubber pipe; the double-way water pump can realize liquid transmission from the first inlet to the first outlet and liquid transmission from the second inlet to the second outlet.

5. The self-circulation C f / Mg composite material recycling device according to claim 1, characterized in that: The industrial computer is connected with the electromagnetic valve, the power supply, the water level sensor, the thermometer, the magnetic heating base, the double-way water pump and the vacuum pump, displays the information sent by the water level sensor and the thermometer, and is convenient for real-time observation of the operator, so as to adjust the control of the magnetic heating base and the electromagnetic valve, control the output voltage of the power supply through the industrial computer, and meet the requirements of the recovery reaction conditions.

6. The self-circulation C f / Mg composite material recycling device according to any one of claims 1-5, characterized in that: The specific steps are as follows: ​ 7. A self-circulating C f / Mg composite material recycling method based on thermoelectric synergy, by the self-circulating C f / Mg composite material recycling device of claim 6; characterized in that The electrolyte is injected into the filter bottle, and then the electrolyte is injected into the recovery tank to the required water level by opening the electromagnetic valve, and the electromagnetic valve is closed; According to the self-circulation C f The structure of the / Mg composite material recycling device is installed. The magnetic heating base and the power supply are started, the working parameters are adjusted, and the reaction is started. ​ After the reaction lasts for 3-5 minutes, start the bidirectional water pump to recycle and set the timing switch parameter to work for 30-60 seconds and then pause for 5-10 minutes; Turn on the vacuum pump to provide a low-pressure environment for the reaction; Repeat the above reaction and recycling steps until the recycling is completed; After the recycling is completed, take out the filter screen and filter paper, recycle the carbon fiber debris and magnesium hydroxide precipitate, open the fixed baffle, take out the recycling part, peel off the filter screen pocket, take out the carbon fiber in the recycling part, and acid wash, which completes the recycling.

8. A self-circulating C f / Mg composite material recycling method, characterized by: The working parameters of the magnetic heating base and power supply are that the rotating speed is in the range of 500-1500 rpm, the temperature is in the range of 30-100℃, and the power supply voltage is in the range of 1-10 V.

9. A self-circulating C f / Mg composite material recycling method, characterized by: The reaction process is that after the power is turned on, the reaction occurs in the recycling pool, and the magnesium in the composite recycling part is electrolyzed to generate white magnesium hydroxide precipitate; after the reaction lasts for 3-5 minutes, the electrolyte after the reaction is introduced into the suction filter bottle by the bidirectional water pump; The carbon fiber debris remaining in the electrolyte is intercepted by the filter screen, and then the magnesium hydroxide precipitate in the electrolyte is filtered by suction filtration to separate the recycling products; the filtered electrolyte flows into the liquid preparation pool again under the action of the bidirectional water pump to realize the circulation of the electrolyte; the electrolyte is a sodium chloride solution with a concentration of 2.5%.

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