Self-circulation Cf / Mg composite material recovery device based on thermoelectric synergy and method thereof

Abstract

The invention discloses a self-circulation Cf / Mg composite material recovery device based on thermoelectric synergy and a method thereof, and belongs to the field of material recovery. Comprising an electrochemical reaction module as well as a heating and stirring module and a recycling module which are connected with the electrochemical reaction module, the electrochemical reaction is accelerated through the heating and stirring module, automatic circulation and filtration of electrolyte are realized through the recycling module, and the concentration stability and the recycling rate of the electrolyte are ensured; the electrochemical reaction module comprises a recovery pool containing electrolyte and a reaction part arranged in the recovery pool, and the reaction part comprises a recovery part connected with the positive electrode of a power supply and a carbon steel plate connected with the negative electrode of the power supply; and the recycling module is used for filtering and recycling the reacted electrolyte and recycling the filtered electrolyte to the recycling pool for continuous recycling. Recycling can be conducted at the normal temperature, the risk that magnesium alloy is flammable and explosive in the high-temperature environment is avoided, meanwhile, the energy consumption is reduced while the recycling rate is guaranteed, and green and environment-friendly recycling is achieved.

Description

Technical Field

[0001] The present invention belongs to the field of material recovery, and specifically relates to a self-circulating C f / Mg composite material recovery device and method. Background Art

[0002] With the rapid development of my country's scientific and technological strength, the requirements for materials of various high-end equipment tend to be "stronger, stronger and lighter". f / Mg composites have the advantages of low density, high specific strength, high specific stiffness, good damping performance and excellent processing performance, showing important application prospects. However, there is a large potential difference between magnesium and carbon fiber. f / Mg composite materials are prone to corrosion in actual use, resulting in component overload, which shortens the service life of the equipment. In addition, the high cost of carbon fiber leads to f The high price of C / Mg composites limits their further development. f A method for recovering carbon fiber and magnesium in a / Mg composite material is used to recover the carbon fiber and magnesium matrix after the composite material corrodes and fails to work, and then prepare the composite material again to improve C f / Mg composites, thereby improving economics and sustainability.

[0003] At present, existing research on the recycling of carbon fiber mainly focuses on carbon fiber reinforced resin-based (CFRP) materials. The pyrolysis method is used to heat the CFRP at high temperature to gasify and decompose the matrix resin to extract the carbon fiber. However, the vaporization temperature of the alloy is much higher than that of the resin material, which increases the difficulty and cost of recycling. In addition, magnesium alloys are flammable and explosive, and high-temperature recycling is dangerous. The electrochemical recovery device for resin-based composite materials proposed in the prior art has built a room temperature recovery system to effectively reduce energy consumption. In addition, high-temperature gasification is avoided during the recycling process to reduce the possibility of gas volatilization polluting the environment; this method will have continuous generation of electrolysis products during the recycling process, which will affect the concentration of the electrolyte, resulting in the actual recovery efficiency being too low and unable to meet the needs of industrial applications.

[0004] Therefore, there is a lack of C in the current public technology. f The present invention designs a C / Mg self-circulating electrolyte based on thermoelectric synergy. f / Mg composite material recovery device. Summary of the invention

[0005] Technical issues to be solved:

[0006] In order to avoid the shortcomings of the prior art, the present invention provides a self-circulating Cf / Mg composite material recovery device and method, the device adopts thermoelectric synergy to accelerate the molecular movement in the reaction process, realizes automatic circulation and filtration of electrolyte through self-circulation, can be recovered at room temperature, avoids the risk of flammability and explosion of magnesium alloy in high temperature environment, reduces energy consumption while ensuring the recovery rate, and realizes green and environmentally friendly recovery.

[0007] The technical solution of the present invention is: a self-circulating C f / Mg composite material recovery device, including an electrochemical reaction module and a heating and stirring module and a circulation recovery module connected thereto, the heating and stirring module accelerates the electrochemical reaction, and the circulation recovery module realizes automatic circulation and filtration of the electrolyte, thereby ensuring the stability of the electrolyte concentration and the recovery rate;

[0008] The electrochemical reaction module includes a recovery tank containing an electrolyte and a reaction piece placed therein, wherein the reaction piece includes a recovery piece connected to the positive electrode of the power supply and a carbon steel plate connected to the negative electrode of the power supply;

[0009] The recycling module filters and recovers the electrolyte after the reaction, and recycles the filtered electrolyte to the recycling pool for continuous recycling.

[0010] A further technical solution of the present invention is: the electrochemical reaction module also includes a liquid distribution tank placed above the recovery tank and a water level sensor and a thermometer placed in the recovery tank. The bottom of the liquid distribution tank is connected to the recovery tank, and the on-off and the flow rate of the electrolyte are controlled by an electromagnetic valve arranged at the bottom. The water level and temperature information of the electrolyte in the recovery tank are obtained by the water level sensor and the thermometer, and sent to the industrial computer; a deionized water inlet is provided on the top of the liquid distribution tank for replenishing the water evaporated in the heating reaction to keep the electrolyte concentration unchanged.

[0011] A further technical solution of the present invention is: the top opening of the recovery pool is enclosed with a fixed baffle, the recovery piece and the carbon steel plate are respectively installed under the fixed baffle through clamps and extend into the electrolyte of the recovery pool; and a filter net bag is sleeved on the periphery of the recovery piece.

[0012] A further technical solution of the present invention is: the heating and stirring module includes a rotor placed in the recovery tank and a magnetic heating base arranged below, the rotor is adsorbed to the bottom surface of the recovery tank by magnetic force, the magnetic heating base heats the electrolyte in the recovery tank and provides rotational power for the rotor.

[0013] A further technical solution of the present invention is: the circulation recovery module includes a suction bottle, a filter screen and filter paper placed in the suction bottle, a two-way water pump and a vacuum pump connected to the suction bottle; the two-way water pump is connected between the suction bottle and the electrochemical reaction module, and can draw the electrolyte after the reaction in the recovery pool into the suction bottle, and after filtering through the filter paper placed in the suction bottle and the filter screen below the water inlet, the filtered electrolyte is then drawn into the liquid preparation pool; the vacuum pump is used to provide a low-pressure environment for the suction bottle.

[0014] A further technical solution of the present invention is: the bidirectional water pump includes two water inlets and two water outlets, the first water inlet is connected to the bottom of the recovery tank through a rubber tube, the first water outlet is connected to the water inlet of the suction bottle through a rubber tube, the second water inlet is connected to the bottom of the suction bottle through a rubber tube, and the second water outlet is connected to the liquid distribution tank through a rubber tube; it can realize liquid transportation from the first inlet to the first outlet and liquid transportation from the second inlet to the second outlet.

[0015] A further technical solution of the present invention is: it also includes an industrial computer, which is respectively connected to the solenoid valve, power supply, water level sensor, thermometer, magnetic heating base, two-way water pump, and vacuum pump. The industrial computer displays the information sent by the water level sensor and the thermometer to facilitate real-time observation by the operator, thereby adjusting the control of the magnetic heating base and the solenoid valve, and controlling the power supply output voltage through the industrial computer to meet the recovery reaction condition requirements.

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

[0017] According to the self-circulating C f / The structure of the Mg composite material recovery device is used to install various components;

[0018] Inject the electrolyte into the suction filtration bottle, then inject the electrolyte into the required water level of the recovery tank by opening the solenoid valve, and close the solenoid valve;

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

[0020] After the reaction lasts for 3 to 5 minutes, start the bidirectional water pump for recycling, and set the timer switch parameters to work for 30 to 60 seconds and then pause for 5 to 10 minutes to continue the cycle;

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

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

[0023] After the recycling process is completed, the filter screen and filter paper are removed, and the carbon fiber fragments and magnesium hydroxide precipitate therein are recovered; the fixed baffle is opened, the recycling part is taken out and the filter net bag is peeled off, and the carbon fiber in the recycling part is taken out for acid washing, and the recycling is completed.

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

[0025] A further technical solution of the present invention is: the reaction process is as follows: after the power is turned on, a reaction occurs in the recovery pool, and magnesium in the composite material recovery piece is electrolyzed to generate white magnesium hydroxide precipitate; after the reaction lasts for 3 to 5 minutes, the electrolyte after the reaction is introduced into the suction filtration bottle by a two-way water pump; the carbon fiber debris remaining in the electrolyte is intercepted by a filter screen, and then the magnesium hydroxide precipitate in the electrolyte is filtered by suction filtration to achieve separation of the recovered product; the filtered electrolyte flows back into the liquid distribution pool under the action of the two-way water pump to achieve circulation of the electrolyte; the electrolyte is a sodium chloride solution with a concentration of 2.5%.

[0026] Beneficial Effects

[0027] The beneficial effects of the present invention are as follows: the present invention proposes a C based on thermoelectric synergy f The self-circulating recycling device of the magnesium / Mg composite material has the advantages of safety, stability, green environmental protection and low energy consumption. In addition, it has few restrictions on the geometric shape and size of the recycled samples and has a wide range of applications. The thermal field and power field are introduced into the conventional electrochemical recycling method to achieve thermoelectric synergy, which significantly improves the C f / Mg composite material recovery efficiency; by introducing a filtration system, the circulation of the electrolyte is realized, which effectively prevents the electrolysis products and the carbon fiber detached during the reaction from affecting the recovery process, and improves the subsequent recovery efficiency; under low power, magnesium hydroxide adheres to the surface of the carbon fiber, resulting in a slow recovery rate, and under high power, the surface of the carbon fiber is damaged, resulting in a decrease in the recovery rate. When the voltage is 2.5V, 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. Safe, stable, green and environmentally friendly; using room temperature electrochemical recycling to avoid high temperature safety hazards and reduce gas volatilization pollution. The magnetic heating base provides a mild thermal field (30-100℃), combined with a self-circulating system, to achieve a low-energy, low-emission green recycling process.

[0029] 2. High efficiency recovery and low energy consumption; through thermoelectric synergy (heat + power) to accelerate molecular movement, significantly improve the reaction rate; through the electrolyte self-circulation and filtration system to maintain stable concentration, the recovery efficiency is as high as 93%-97%. The bidirectional pump and vacuum pump realize automatic circulation and filtration of the electrolyte, and the industrial computer accurately controls the voltage (2.5V optimized value), which not only disperses the magnesium hydroxide on the surface of the carbon fiber, but also avoids fiber damage.

[0030] 3. Wide applicability: Through the design of the clamp and filter net, it can adapt to recycling parts of different shapes and is suitable for Cf / Mg composite materials with complex geometric structures. The modular design of the device (electrochemical reaction module + recycling module) can flexibly respond to various recycling needs.

[0031] 4. Automatic control and easy operation: Through the integrated control of industrial computers (solenoid valve, temperature, water level, water pump, etc.), the whole process is automated, and the operation accuracy and stability are improved. The electrolyte water level and temperature are monitored in real time, and the parameters are adjusted dynamically to ensure the continuous and stable operation of the recovery process.

[0032] 5. High-value utilization of products: Through filtering and pickling processes, carbon fiber and magnesium hydroxide precipitation are separated. Carbon fiber can be recycled, and magnesium hydroxide can be used as a flame retardant, desulfurizer, etc., to improve economic efficiency. The filter screen in the suction bottle intercepts debris, and the two-way water pump realizes efficient solid-liquid separation.

[0033] 6. Low cost and sustainability; reduce energy consumption through room temperature electrochemical recycling; electrolyte recycling reduces raw material waste and further reduces costs. 2.5% sodium chloride solution is used as the electrolyte, the material is easy to obtain and there are no regulated chemicals, which meets the needs of sustainable development.

[0034] 7. Anti-corrosion and extending material life: Cf / Mg composite materials are prone to corrosion due to potential difference. Efficient recycling can achieve material regeneration, reduce resource waste, and extend the entire life cycle of composite materials. The performance of recycled carbon fiber after acid washing is close to that of original fiber and can be directly used in the preparation of new composite materials.

[0035] The present invention solves the problems of safety, efficiency and economy in the recycling of Cf / Mg composite materials by accelerating the reaction through thermoelectric synergy, stabilizing the concentration through self-circulation of electrolyte, improving efficiency through automated control and high-value utilization of products. It is environmentally friendly, universal and has industrial potential, and provides technical guarantee for the sustainable application of lightweight materials. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 The C based on the thermoelectric synergy in the embodiment of the present invention f Schematic diagram of the structure of the self-circulating recovery device of / Mg composite materials.

[0037] Figure 2 yes Figure 1 Schematic diagram of the interior of the liquid preparation tank.

[0038] Figure 3 yes Figure 1 Schematic diagram of the clamping state of the middle fixture.

[0039] Figure 4 The morphology before and after recycling, (a) before recycling, (b) after recycling.

[0040] Figure 5 These are microscopic images of carbon fibers after recycling under different voltages, (a) 0V, (b) 2.5V, and (c) 3V.

[0041] Figure 6 is the recovery rate at different voltages.

[0042] Figure 7 These are microscopic images of recycled carbon fibers, (a) before pickling, and (b) after pickling.

[0043] Explanation of the reference numerals: 1. liquid distribution tank, 2. rubber tube, 3. bracket, 4. solenoid valve, 5. wire, 6. DC power supply, 7. data cable, 8. industrial computer, 9. fixture, 10. fixed baffle, 11. water level sensor, 12. recovery part, 13. carbon steel plate, 14. thermometer, 15. filter net bag, 16. rotor, 17. recovery tank, 18. magnetic heating base, 19. two-way water pump, 20. filter screen, 21. filter bottle, 22. vacuum pump. DETAILED DESCRIPTION

[0044] The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, but should not be construed as limiting the present invention.

[0045] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0046] Based on the current carbon fiber recycling method and magnesium alloy recycling method, it is impossible to achieve C f The recycling of / Mg composite materials may lead to high costs, unstable electrolyte concentration, flammability and explosion during high-temperature recycling, etc. The present invention provides a self-circulating C f / Mg composite material recovery device, including an electrochemical reaction module and a heating and stirring module and a circulation recovery module connected thereto, the electrochemical reaction is accelerated by the heating and stirring module, and the automatic circulation and filtration of the electrolyte is realized by the circulation recovery module, so as to ensure the stability of the electrolyte concentration and the recovery rate; the electrochemical reaction module includes a recovery tank containing the electrolyte and a reaction part placed therein, the reaction part includes a recovery part connected to the positive electrode of the power supply and a carbon steel plate connected to the negative electrode of the power supply; the circulation recovery module filters and recovers the electrolyte after the reaction, and circulates the filtered electrolyte to the recovery tank again for continuous recycling.

[0047] The heating and stirring module of the device of the present invention is a recovery module built on a magnetic heating base to introduce power and heat into the electrochemical recovery process, accelerate molecular motion, and improve recovery efficiency; through an external circulation recovery module, the electrolyte circulation flow is realized, and a filtration system is built during the flow process to collect the electrolysis products to avoid the adverse effects of electrolyte concentration imbalance on the recovery efficiency. The recovery method using this device does not require the construction of a high-temperature environment during the recovery process, avoids the explosion generated during the gasification process of the magnesium alloy, reduces the recovery cost, and prevents gas volatilization from polluting the environment. In addition, the introduction of self-circulation and thermoelectric synergistic systems effectively improves work efficiency, realizes large-scale recovery, reduces recovery costs, and achieves green recovery.

[0048] The above technical solution is further analyzed below in conjunction with the accompanying drawings:

[0049] In one embodiment, referring to Figure 1 As shown, this embodiment is based on the C of the thermoelectric method fThe invention discloses a recovery device for reinforcing phase and matrix material of a / Mg composite material, comprising a liquid distribution tank 1, a rubber tube 2, a bracket 3, an electromagnetic valve 4, a wire 5, a DC power supply 6, a data cable 7, an industrial computer 8, a fixture 9, a fixed baffle 10, a water level sensor 11, a recovery part 12, a carbon steel plate 13, a thermometer 14, a filter net bag 15, a rotor 16, a recovery tank 17, a magnetic heating base 18, a two-way water pump 19, a filter screen 20, a filter bottle 21 and a vacuum pump 22; the liquid distribution tank 1 is fixed on the bracket 3, the fixed baffle 10 is sealed, deionized water is introduced into the side through an external rubber tube 2, and a electromagnetic valve 4 is installed at the lower end; the recovery tank 17 is placed on ... the external rubber tube 2, and a electromagnetic valve 4 is installed at the lower end; the recovery tank 17 is placed on a magnetic heating base 18, a two-way water pump 19, a filter screen 20, a filter bottle 21 and a vacuum pump 22; the liquid distribution tank 1 The magnetic heating base 18 is above and below the liquid distribution tank 1, and the bottom of the liquid distribution tank 1 passes through the fixed baffle 10 and enters the recovery tank 17; the magnetic heating base 18 is connected to the industrial computer 8 through the data line 7 to realize the control of temperature and power during the reaction process; the water level sensor 11 is adhered to the upper part of the inner wall of the recovery tank 17, and the thermometer 14 is suspended inside the recovery tank 17 and connected to the industrial computer 8 through the data line 7 to realize the data display and real-time observation of the water level sensor 11 and the thermometer 14; the rotor 16 is adsorbed on the bottom of the recovery tank 17 by magnetic force; the power supply 6 is placed on the left side of the recovery tank 17 and is connected to the industrial computer 8 through the data line 7. Two wires 5 are led out of the positive and negative poles of the power supply and connected to the clamp 9, the positive terminal clamps the recovery part 12, the negative terminal clamps the carbon steel plate 13, and the filter net bag 15 is sleeved on the outside of the recovery part 12; the suction bottle 21 is located on the right side of the recovery tank 17, and the filter screen 20 is placed below the water inlet of the suction bottle 21; a water outlet is provided at the bottom of the recovery tank 17, and a rubber tube 2 is connected to the lower interface of the two-way water pump 19, and the liquid flow is controlled by the two-way water pump 19, and the upper interface of the two-way water pump 19 is connected to the suction bottle 21 through the rubber tube 2. The vacuum pump 22 is located on the right side of the suction bottle 21, and is connected to the suction bottle 21 through the rubber tube 2 to provide a low-pressure environment inside it; a water outlet is provided at the bottom of the suction bottle 21, which is connected to the lower interface of the two-way water pump 19 through the rubber tube 2, and continues to connect the upper interface to the liquid distribution tank 1 to realize the circulation of the electrolyte.

[0050] In one embodiment, a C f A recycling method for carbon fiber and magnesium alloy of / Mg composite materials is provided, using AZ91D magnesium alloy and Taili T700 carbon fiber preform.

[0051] Step 1: Preparation of recovered samples and electrolyte. f / Mg composite materials and carbon steel were cut into 3×3×1(cm 3 ) samples, use 80-mesh sandpaper to clean the oxide film on the sample surface. Fix the recovery part 12 and the carbon steel plate 13 to the bottom of the two clamps 9 by screw clamping. f A filter net bag 15 is put on the Mg / Mg composite material. A sodium chloride solution with a concentration of 2.5% is prepared.

[0052] Step 2: Installation of the recovery device. Fix the recovery part 12, carbon steel plate 13, temperature sensor 14 and liquid preparation tank 1 on the fixed baffle 10, and then install the fixed baffle 10 on the upper end of the recovery tank 17. Connect the recovery part 12 and carbon steel plate 13 to the positive and negative poles of the power supply 6 respectively; connect the solenoid valve 4, power supply 6, water level sensor 11, temperature sensor 14, water pump 19 and vacuum pump 21 to the control unit 8 through the data line 7; connect the water outlet at the bottom of the recovery tank 17 and the water outlet at the bottom of the filter bottle 21 to the water inlet of the two-way water pump 19 with a rubber tube 2, and connect the water inlet at the top of the liquid preparation tank 1 and the filter bottle 21 to the water outlet of the two-way water pump 19 with a rubber tube 2. Put the filter paper into the filter bottle 21, fix the filter bottle 21 with a 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 computer 8 to set the program to open the solenoid valve 4 and the water level sensor 11. When the water level reaches the position of the water level sensor 11, close the solenoid valve 4 to stop water injection. Start the magnetic heating base 18, set the speed to 1000rpm, and the temperature to 50°C. Turn on the power supply 6, fix the current parameters, and adjust the voltage parameters to 5V. After the reaction lasts for 5 minutes, start the two-way water pump 19, and set the timing switch parameters to work for 60 seconds after pausing for 10 minutes. Turn on the vacuum pump 22, set the time to 3 minutes later, and turn off the vacuum pump and the two-way water pump 19. Repeat the above steps, use the solenoid valve 4, the two-way water pump 19 and the vacuum pump 22 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 solenoid valve 4 and introduce new deionized water through the rubber tube 2;

[0054] Step 4: Material recovery process. Use the industrial computer 8 to close the solenoid valve 4 and the two-way pump 19; inject electrolyte into the liquid distribution tank 1; use the industrial computer 8 to run the program to inject the sodium chloride solution in the liquid distribution tank 1 into the recovery tank 17; the magnetic heating base 18 drives the rotor 16 to rotate to make the electrolyte fluid; after the power supply 6 is turned on, a reaction occurs in the recovery tank 17, and the magnesium in the composite material is electrolyzed to generate a white magnesium hydroxide precipitate; after the reaction lasts for 5 minutes, the reacted electrolyte is introduced into the suction bottle 21; the filter 20 can intercept the carbon fiber debris remaining in the electrolyte, and then the magnesium hydroxide precipitate in the electrolyte is filtered by suction to achieve separation of the recovered products; the filtered electrolyte flows back into the liquid distribution tank 1 under the action of the two-way pump 19 to achieve the circulation of the electrolyte;

[0055] Step 5: Cleaning and reuse of recycled materials. The recycling process is completed after 2 days. The filter screen 20 and filter paper are taken out, and the carbon fiber fragments and magnesium hydroxide precipitate therein are recovered; the fixed baffle is opened, the recycling part 12 is taken out and the filter net bag 15 is peeled off, and the carbon fiber in the recycling part 12 is taken out for acid washing with a recovery rate of 93%. If necessary, the carbon fiber can be broken up by ball milling for further application. In addition, the recovered magnesium hydroxide precipitate can be further applied as a flame retardant, desulfurizer and neutralizer, etc.

[0056] In one embodiment, a C f / Mg composite carbon fiber and magnesium alloy recycling method, using AZ31B magnesium alloy, Taili T700 carbon fiber preform. The recycling rate reaches 95%.

[0057] In one embodiment, a C f A method for recycling carbon fiber and magnesium matrix of a composite material of magnesium is provided, wherein Mg and Taili T700 carbon fiber preform are selected, and the recycling rate reaches 97%.

[0058] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations on the present invention. A person skilled in the art may change, modify, replace and modify the above embodiments within the scope of the present invention without departing from the principles and intent of the present invention.

Claims

1. A self-circulating C based on heat and power synergy f / Mg composite material recovery device, characterized by: It includes an electrochemical reaction module and a heating and stirring module and a circulation recovery module connected thereto. The heating and stirring module accelerates the electrochemical reaction, and the circulation recovery module realizes automatic circulation and filtration of the electrolyte, thereby ensuring the stability of the electrolyte concentration and the recovery rate. The electrochemical reaction module includes a recovery tank containing an electrolyte and a reaction piece placed therein, wherein the reaction piece includes a recovery piece connected to the positive electrode of the power supply and a carbon steel plate connected to the negative electrode of the power supply; The recycling module filters and recovers the electrolyte after the reaction, and recycles the filtered electrolyte to the recycling pool for continuous recycling.

2. According to claim 1, a self-circulating C based on heat and power synergy f / Mg composite material recovery device, characterized by: The electrochemical reaction module also includes a liquid distribution tank placed above the recovery tank and a water level sensor and a thermometer placed in the recovery tank. The bottom of the liquid distribution tank is connected to the recovery tank, and the on-off and electrolyte flow rate are controlled by a solenoid valve arranged at the bottom. The water level and temperature information of the electrolyte in the recovery tank are obtained through the water level sensor and the thermometer, and sent to the industrial computer; a deionized water inlet is provided on the top of the liquid distribution tank for replenishing the water evaporated in the heating reaction to keep the electrolyte concentration unchanged.

3. According to claim 2, a self-circulating C based on heat and electricity synergy f / Mg composite material recovery device, characterized by: The top opening of the recovery tank is enclosed with a fixed baffle, and the recovery piece and the carbon steel plate are respectively installed under the fixed baffle through clamps and extend into the electrolyte of the recovery tank; and a filter net bag is sleeved on the periphery of the recovery piece.

4. According to claim 3, a self-circulating C based on heat and power synergy f / Mg composite material recovery device, characterized by: The heating and stirring module includes a rotor placed in a recovery tank and a magnetic heating base arranged below. The rotor is adsorbed to the bottom surface of the recovery tank by magnetic force. The magnetic heating base heats the electrolyte in the recovery tank and provides rotational power for the rotor.

5. According to claim 4, a self-circulating C based on heat and power synergy f / Mg composite material recovery device, characterized by: The circulation recovery module includes a suction bottle, a filter screen and filter paper placed in the suction bottle, a two-way water pump and a vacuum pump connected to the suction bottle; the two-way water pump is connected between the suction bottle and the electrochemical reaction module, and can draw the electrolyte after the reaction in the recovery pool into the suction bottle, and after filtering through the filter paper placed in the suction bottle and the filter screen below the water inlet, the filtered electrolyte is then drawn into the liquid preparation pool; the vacuum pump is used to provide a low-pressure environment for the suction bottle.

6. A self-circulating C based on heat and power synergy according to claim 5 f / Mg composite material recovery device, characterized by: The bidirectional water pump includes two water inlets and two water outlets. The first water inlet is connected to the bottom of the recovery tank through a rubber tube, the first water outlet is connected to the water inlet of the suction filter bottle through a rubber tube, the second water inlet is connected to the bottom of the suction filter bottle through a rubber tube, and the second water outlet is connected to the liquid distribution tank through a rubber tube; it can realize liquid transportation from the first inlet to the first outlet and liquid transportation from the second inlet to the second outlet.

7. A self-circulating C based on heat and power synergy according to any one of claims 1 to 6 f / Mg composite material recovery device, characterized by: It also includes an industrial computer, which is respectively connected to the solenoid valve, power supply, water level sensor, thermometer, magnetic heating base, two-way water pump, and vacuum pump. The industrial computer displays the information sent by the water level sensor and the thermometer to facilitate real-time observation by the operator, thereby adjusting the control of the magnetic heating base and the solenoid valve, and controlling the power supply output voltage through the industrial computer to meet the recovery reaction condition requirements.

8. A self-circulating C based on heat and power synergy f / Mg composite material recovery method, through the self-circulating C based on thermoelectric synergy as claimed in claim 7 f / Mg composite material recovery device is implemented; it is characterized by The specific steps are as follows: According to the self-circulating C f / The structure of the Mg composite material recovery device is used to install various components; Inject the electrolyte into the suction filtration bottle, then inject the electrolyte into the required water level of the recovery tank by opening the solenoid valve, and close the solenoid valve; Start the magnetic heating base and power supply, adjust the working parameters, and start the reaction; After the reaction lasts for 3 to 5 minutes, start the bidirectional water pump for recycling, and set the timer switch parameters to work for 30 to 60 seconds and then pause for 5 to 10 minutes to continue the cycle; Turn on the vacuum pump to provide a continuous low-pressure environment for the reaction process; Repeat the above reaction and cycle steps until the recovery is completed; After the recycling process is completed, the filter screen and filter paper are removed, and the carbon fiber fragments and magnesium hydroxide precipitate therein are recovered; the fixed baffle is opened, the recycling part is taken out and the filter net bag is peeled off, and the carbon fiber in the recycling part is taken out for acid washing, and the recycling is completed.

9. A self-circulating C based on heat and power synergy according to claim 8 f / Mg composite material recovery method, characterized in that: The working parameters of the magnetic heating base and the power supply are: the rotation speed is in the range of 500-1500rpm, the temperature is in the range of 30-100°C, and the power supply voltage is in the range of 1-10V.

10. A self-circulating C based on heat and power synergy according to claim 9 f / Mg composite material recovery method, characterized in that: The reaction process is as follows: after the power is turned on, a reaction occurs in the recovery pool, and magnesium in the composite material recovery piece is electrolyzed to generate white magnesium hydroxide precipitation; after the reaction lasts for 3 to 5 minutes, the electrolyte after the reaction is introduced into the suction filtration bottle by a bidirectional water pump; The residual carbon fiber debris in the electrolyte is intercepted by a filter, and then the magnesium hydroxide precipitate in the electrolyte is filtered by suction to achieve separation of the recovered product; the filtered electrolyte flows back into the liquid distribution tank under the action of a two-way water pump to achieve circulation of the electrolyte; the electrolyte is a sodium chloride solution with a concentration of 2.5%.

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