A plasma activated graphite purification device and purification process

Abstract

The present invention relates to a plasma activated graphite purification device and a purification process in the field of graphite purification technology. The plasma activated graphite purification device includes a plasma activated purification component, the plasma activated purification component includes a purification box, two electrodes and two insulating dielectric parts, the two electrodes are respectively located at both sides of the purification box and extend out of the top of the purification box, the two electrodes are respectively a positive electrode and a negative electrode, the two insulating dielectric parts are respectively located at both sides of the purification box and extend out of the top of the purification box, and the two insulating dielectric parts are respectively sleeved on the outside of the two electrodes, and air is injected into the insulating dielectric parts. Under air conditions, the insulating medium is used for dielectric barrier discharge of the two electrodes, and the air is ionized to generate negative oxygen ions, which are used for the purification of graphite suspension and as a reducing agent for subsequent acid hydrolysis. The plasma active particles of the present invention are generated in the graphite suspension and quickly mixed with the graphite suspension, thereby improving the graphite purification effect and efficiency.

Description

Technical Field

[0001] The invention relates to the technical field of graphite purification, in particular to a plasma activated graphite purification device and a purification process. Background Art

[0002] The purity of general graphite products cannot meet the requirements of the high-purity graphite industry. This is because graphite contains impurities during production. The impurities mainly come from impurity minerals in natural graphite ores and residues in the production process. Therefore, in the production process of graphite products, effective measures need to be taken to reduce the content of impurities and improve the purity and performance of graphite products.

[0003] Plasma activated graphite purification technology is a purification method that uses the high energy state of plasma to activate impurities in graphite, making it easy to separate from the graphite matrix. Under the action of plasma, this technology activates the impurity molecules in the graphite, enhances dispersibility, and changes the surface charge and potential, making it easy to remove impurities from the graphite, which can effectively improve the purity of graphite while reducing production costs and reducing environmental impact. As can be seen from the prior art publications CN111333065B, a plasma injection high-purity graphite purification device, CN110240157B, a discharge plasma activated graphite purification device, and CN111302337B, a plasma contact graphite purification device, there are currently two plasma activated graphite purification methods:

[0004] First, the working gas is injected into the dielectric barrier discharge plasma generator for discharge to generate plasma active particles, and the plasma active particles are injected into the graphite suspension in the form of gas for reaction, and then after solid-liquid separation, the solid reacts with the combination agent to obtain high-purity graphite;

[0005] The second method is to treat graphite at a certain temperature through dielectric barrier discharge, and then obtain high-purity graphite after centrifugal separation and reaction with a combination agent.

[0006] The first method: After the working gas is processed and becomes plasma active particles, it needs to be transported to the graphite suspension. During the transportation process, there will be loss of plasma active particles. This loss is mainly caused by the friction between the gas and the inner wall of the pipeline, the collision between gas molecules and the local resistance in the pipeline. Therefore, there is a large error in the actual injection amount of plasma active particles, which can easily reduce the efficiency and effect of graphite purification.

[0007] The second method: dielectric barrier discharge is to fill the space between two discharge electrodes with a certain working gas, and cover one or both electrodes with an insulating medium. When a sufficiently high AC voltage is applied between the two electrodes, the gas between the electrodes will be broken down and discharge will occur. The second method is to break down the gas on the surface of the graphite suspension liquid to discharge, so a discharge plasma is generated on the surface of the liquid. The discharge plasma only contacts the surface of the liquid, and a stirring device is required to promote the mixing of the two, which has the problems of high cost and low purification efficiency.

[0008] Based on the above problems, the present application proposes a plasma activated graphite purification device and a purification process. Summary of the invention

[0009] In order to solve the problems of low graphite purification efficiency and poor purification effect proposed in the above background technology, the present invention provides the following technical solutions:

[0010] A plasma activated graphite purification device, comprising a plasma activated purification component, wherein the plasma activated purification component comprises:

[0011] A purification box, used to hold the graphite suspension to be purified;

[0012] Electrodes, two of which are located at two sides of the purification box and extend out of the top of the purification box, and the two electrodes are respectively a positive electrode and a negative electrode;

[0013] There are two insulating dielectric members, which are respectively located on both sides of the purification box and extend out of the top of the purification box, and are respectively sleeved outside the two electrodes, and are used for dielectric barrier discharge of the two electrodes, so that the working gas injected between the two electrodes discharges in the graphite suspension to generate plasma active particles mixed with the graphite suspension;

[0014] Air is injected into the insulating dielectric member. Under air conditions, the insulating dielectric member acts as an insulating medium for dielectric barrier discharge of two electrodes. At the same time, air ionization generates negative oxygen ions. The negative oxygen ions are highly active and can react with organic pollutants and chemicals in the liquid. Impurities in the water can be degraded and removed through the transfer of electrons. They are used for the purification of graphite suspensions. At the same time, negative oxygen ions are a powerful reducing agent and can be used as a reducing agent in subsequent acid hydrolysis processes.

[0015] Furthermore, the insulating medium component includes an insulating sleeve arranged in the purification box, and the insulating sleeve is arranged outside the electrode, the outer wall of the insulating sleeve is wrapped with a spiral insulating tube, the outer wall of the insulating sleeve is located on the inner side of the spiral insulating tube and is provided with connecting holes showing a spiral distribution, the insulating sleeve is connected with the spiral insulating tube through the connecting holes, and the outer wall of the spiral insulating tube is provided with multiple through holes.

[0016] Furthermore, the bottom end of the insulating sleeve is fixedly connected to an air pipe, and the air pipe passes through the bottom end of the purification box for connecting to an air source. The air is transported into the insulating sleeve through the air pipe. The two electrodes are connected to a high-voltage power supply. When power is turned on, the insulating sleeve serves as an insulating medium for the electrodes, allowing the two electrodes to perform dielectric barrier discharge, and the air in the insulating sleeve is simultaneously ionized to produce negative oxygen ions.

[0017] Furthermore, an upper cylinder is provided at the top of the insulating sleeve and the upper cylinder is connected to the insulating sleeve, the upper cylinder passes through the top of the purification box and is fixedly connected to the purification box, and an outlet pipe is fixedly connected to the outside of the upper cylinder, the top of the electrode passes through the upper cylinder and extends out of the top of the upper cylinder, and the electrode is fixedly connected to the upper cylinder; a part of the air and negative oxygen ions in the insulating sleeve are discharged outside the purification box through the upper cylinder and the outlet pipe, and the other part of the air and negative oxygen ions in the insulating sleeve are discharged into the graphite suspension in the purification box through the connecting hole, the spiral insulating tube and the through hole, for purification of the graphite suspension.

[0018] Furthermore, a gas pipe is fixedly connected at the center of the bottom end of the purification box, the gas pipe is connected to a gas source, and the working gas is transported into the space between two insulating dielectric parts in the purification box through the gas pipe, and plasma active particles are generated through dielectric barrier discharge, and the plasma active particles are mixed with a graphite suspension; a gas dividing plate is fixed at the bottom end of the interior of the purification box, the gas dividing plate is located between the two insulating dielectric parts and at the top of the gas pipe, the gas dividing plate includes an outer frame and a mesh plate fixed in the outer frame, the mesh plate is composed of a plurality of longitudinal plates and a plurality of transverse plates, and the cross-sections of the longitudinal plates and the transverse plates are both triangular, and are used to divide the working gas.

[0019] Furthermore, the air pipe is rotatably connected to the bottom end of the purification box, and the top end of the insulating sleeve is rotatably connected to the bottom end of the upper cylinder, which facilitates the rotation of the insulating sleeve so that the negative oxygen ions and air discharged into the purification box rise in a spiral state to stir the graphite suspension, thereby promoting rapid mixing of the negative oxygen ions and the graphite suspension, and the plasma active particles and the graphite suspension.

[0020] Furthermore, a waterproof and breathable membrane is fixed inside the through hole and the gas tube to prevent the graphite suspension from entering the spiral insulating tube and the gas tube.

[0021] Furthermore, a liquid inlet pipe is fixed on the top of one side of the purification box to facilitate the injection of graphite suspension into the purification box, and a liquid discharge pipe is fixed on the bottom of the other side of the purification box to facilitate the discharge of the treated product.

[0022] Furthermore, the output end of the plasma activated purification component is sequentially connected to a centrifuge, an alkali melting tank, a first water washing tank, an acid hydrolysis tank, a second water washing tank and a dryer; the product discharged from the plasma activated purification component is separated into solid and liquid in the centrifuge, the solid product enters the alkali melting tank for alkali melting treatment, the product of the alkali melting treatment enters the first water washing tank for water washing and then enters the acid hydrolysis tank for acid hydrolysis treatment, the product of the acid hydrolysis treatment is washed by the second water washing tank and then enters the dryer for drying to obtain purified graphite.

[0023] The present invention also includes a purification process of a plasma activated graphite purification device, and the specific steps are as follows:

[0024] S1: Graphite suspension is injected into the purification box, air is injected into the insulating sleeve, and working gas is injected between two electrodes in the purification box. After the two electrodes are connected to high voltage alternating current, the working gas between the electrodes is broken down and discharged to generate plasma active particles. The plasma active particles are generated in the graphite suspension and mixed with the graphite suspension at the same time, making it easy to remove impurities from the graphite;

[0025] At the same time, the air is ionized to generate negative oxygen ions. A part of the air and negative oxygen ions in the insulating sleeve are discharged into the graphite suspension in the purification box through the connecting hole, the spiral insulating tube and the through hole. The negative oxygen ions can purify the impurities in the graphite suspension. At the same time, the insulating sleeve rotates to make the negative oxygen ions and air discharged into the purification box rise in a spiral state in the graphite suspension, stirring the graphite suspension, and promoting the rapid mixing of negative oxygen ions and graphite suspension, plasma active particles and graphite suspension;

[0026] S2, solid-liquid separation: the product in S1 is separated into solid and liquid in a centrifuge;

[0027] S3, alkali melting treatment: the solid product in S2 is transported into an alkali melting tank, sodium hydroxide is added, and a reaction is carried out at a high temperature, so that the impurities in the solid product react with the sodium hydroxide to generate soluble sodium silicate or acid-soluble sodium aluminosilicate;

[0028] S4, first water washing: the product in S3 enters the water washing tank for water washing;

[0029] S5, acid hydrolysis treatment: the product in S4 is transported into the acid hydrolysis tank, and the negative oxygen ions discharged from the purification tank are transported into the acid hydrolysis tank as a reducing agent, and react at room temperature, so that another part of the impurities react with the reducing agent;

[0030] S6, second water washing: the product in S5 is transported to the water washing tank for second water washing;

[0031] S7, drying: the product in S6 is conveyed to a dryer for drying to complete the purification of graphite.

[0032] Compared with the prior art, the present invention has the following beneficial effects:

[0033] 1. The electrodes are connected to high voltage alternating current. Under air conditions, the insulating sleeve acts as the insulating medium of the electrodes to make the two electrodes conduct dielectric barrier discharge. The working gas between the electrodes discharges to generate plasma active particles. The plasma active particles are generated in the graphite suspension and mixed with the graphite suspension at the same time, making it easy to remove impurities from the graphite. Compared with the prior art, the loss of plasma active particles is reduced and the purification effect is improved;

[0034] At the same time, the air is ionized to produce negative oxygen ions. The air and part of the negative oxygen ions in the insulating sleeve are discharged into the graphite suspension in a spiral state through the spiral insulating tube. The negative oxygen ions can purify the impurities in the graphite suspension and stir the graphite suspension, thereby promoting rapid mixing of negative oxygen ions with the graphite suspension, and plasma active particles with the graphite suspension, thereby improving the purification efficiency.

[0035] 2. Another part of the negative oxygen ions in the insulating sleeve enters the acid hydrolysis tank as a reducing agent to carry out acid hydrolysis treatment on the product, which can reduce the amount of other reducing agents added and effectively save costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 It is the overall structure diagram of the present invention;

[0037] Figure 2 A three-dimensional diagram of a plasma activated purification assembly of the present invention;

[0038] Figure 3 It is a front view of the plasma activation purification component of the present invention;

[0039] Figure 4 It is a front cross-sectional view of the plasma activated purification component of the present invention;

[0040] Figure 5 for Figure 4 Enlarged view of part A in the middle;

[0041] Figure 6 for Figure 4 Enlarged view of middle part B;

[0042] Figure 7 This is a diagram showing the internal structure of the purification box of the present invention;

[0043] Figure 8 A cross-sectional view of a gas dividing plate of the present invention;

[0044] Fig. 9 The graphite purification process flow chart of the present invention.

[0045] In the accompanying drawings, the names of the components represented by the reference numerals are listed as follows:

[0046] 1-plasma activation purification component, 2-centrifuge, 3-alkali melting tank, 4-water washing tank 1, 5-acid hydrolysis tank, 6-water washing tank 2, 7-dryer;

[0047] 11-purification box, 12-electrode, 13-insulating medium, 14-gas pipe, 15-gas dividing plate, 16-liquid inlet pipe, 17-liquid discharge pipe;

[0048] 131-insulating sleeve, 132-spiral insulating tube, 133-through hole, 134-connecting hole, 135-waterproof breathable membrane, 136-upper tube, 137-outlet tube, 138-air tube;

[0049] 151-outer frame, 152-mesh plate. DETAILED DESCRIPTION

[0050] The preferred specific embodiments for implementing the present invention are described in detail below, and a clear and complete description is made in conjunction with the accompanying drawings.

[0051] See also Figure 1 The present invention provides a plasma activated graphite purification device, comprising a plasma activated purification component 1, wherein the output end of the plasma activated purification component 1 is sequentially connected to a centrifuge 2, an alkali melting tank 3, a water washing tank 1 4, an acid hydrolysis tank 5, a water washing tank 2 6 and a dryer 7; the plasma active particles in the plasma activated purification component 1 are mixed with a graphite suspension, the discharged product is separated into solid and liquid in the centrifuge 2, the solid product enters the alkali melting tank 3 for alkali melting treatment, the product of the alkali melting treatment enters the water washing tank 1 4 for water washing and then enters the acid hydrolysis tank 5 for acid hydrolysis treatment, the product of the acid hydrolysis treatment is washed by the water washing tank 2 6 and then enters the dryer 7 for drying to obtain purified graphite.

[0052] like Figure 2-7 As shown, the plasma activated purification component 1 comprises:

[0053] The purification box 11 is used to hold the graphite suspension to be purified. A liquid inlet pipe 16 is fixed on the top of one side of the purification box 11 to facilitate the injection of the graphite suspension into the purification box 11. A liquid discharge pipe 17 is fixed on the bottom of the other side of the purification box 11 to facilitate the discharge of the treated product. In practice, an air pressure sensor and a pressure relief pipe can be fixed on the purification box 11. When the air pressure in the purification box 11 exceeds the set air pressure, the pressure is relieved to avoid excessive air pressure in the purification box 11 to cause safety hazards;

[0054] There are two electrodes 12, which are located at both sides of the purification box 11 and extend out of the top of the purification box 11. The two electrodes 12 are respectively a positive electrode and a negative electrode. The two electrodes 12 are connected to a high-voltage AC power supply with a discharge voltage of 3-8 kV, and the electrodes 12 need to be grounded to ensure safety;

[0055] There are two insulating dielectric members 13, which are respectively located on both sides of the purification box 11 and extend out of the top of the purification box 11, and the two insulating dielectric members 13 are respectively sleeved on the outside of the two electrodes 12, and are used for dielectric barrier discharge of the two electrodes 12 (the principle of dielectric barrier discharge is: a certain working gas is filled between the two discharge electrodes, and one or both electrodes are covered with an insulating medium. When a sufficiently high AC voltage is applied between the two electrodes, the gas between the electrodes will be broken down to generate discharge).

[0056] The insulating dielectric member 13 includes an insulating sleeve 131 disposed in the purification box 11, and the insulating sleeve 131 is disposed outside the electrode 12. A spiral insulating tube 132 is wound around the outer wall of the insulating sleeve 131. The insulating sleeve 131 and the spiral insulating tube 132 are made of polytetrafluoroethylene (PTFE). The outer wall of the insulating sleeve 131 is located on the inner side of the spiral insulating tube 132 and is provided with connecting holes 134 that are distributed in a spiral manner. The insulating sleeve 131 is connected to the spiral insulating tube 132 through the connecting holes 134. A plurality of through holes 133 are provided on the outer wall of the spiral insulating tube 132. A waterproof and breathable membrane 135 is fixed inside the through hole 133 to prevent the graphite suspension from entering the spiral insulating tube 132. The waterproof and breathable membrane is a material with special functions that can prevent liquid water from passing through while allowing water vapor and other gases to pass through, thereby achieving the dual functions of waterproofing and breathability. Common materials for waterproof and breathable membranes include TPU (thermoplastic polyurethane), e-PTFE (expanded polytetrafluoroethylene), PE (polyethylene), and PP (polypropylene), all of which are insulating materials.

[0057] The bottom end of the insulating sleeve 131 is fixedly connected with an air pipe 138, which runs through the bottom end of the purification box 11 and is used to connect to an air source. The air is transported into the insulating sleeve 131 through the air pipe 138. At the same time, the center of the bottom end of the purification box 11 is fixedly connected with a gas pipe 14, which is connected to a gas source. The gas is transported into between two insulating dielectric parts 13 in the purification box 11 through the gas pipe 14. A waterproof and breathable membrane 135 is fixed inside the gas pipe 14 to prevent the graphite suspension from entering the gas pipe 14. The air pipe 138 and the gas pipe 14 are both made of insulating materials, and other materials can be selected as required.

[0058] Moreover, if Figure 4 , Figure 7 and Figure 8 As shown, a gas dividing plate 15 is fixed at the bottom of the purification box 11, and the gas dividing plate 15 is located between the two insulating dielectric members 13 and at the top of the gas pipe 14. The gas dividing plate 15 includes an outer frame 151 and a mesh plate 152 fixed in the outer frame 151. The mesh plate 152 is composed of a plurality of longitudinal plates and a plurality of transverse plates, and the cross-sections of the longitudinal plates and the transverse plates are both triangular;

[0059] When the two electrodes 12 are energized, the insulating sleeve 131 acts as an insulating medium of the electrodes 12 so that the two electrodes 12 perform dielectric barrier discharge. At the same time, the working gas enters between the two electrodes 12 after being cut and dispersed by the gas dividing plate 15. The working gas discharges to generate plasma active particles, which are mixed with the graphite suspension. The plasma generates a high-temperature environment. In this environment, impurities in the graphite are evaporated or decomposed due to the high temperature. At the same time, the active particles in the plasma (such as free radical molecules, ions, electrons, etc.) react chemically with the impurities in the graphite. The impurity molecules in the graphite are activated, the dispersion is enhanced, and the surface charge and potential change, so that the impurities are easily removed from the graphite.

[0060] The working gas in the present invention can be selected from:

[0061] ①Argon: can produce active particles such as argon ions;

[0062] ② Oxygen: can produce active particles such as oxygen atoms, hydroxyl free radicals, singlet oxygen, hydrogen peroxide, etc.

[0063] ③Nitrogen: can produce active particles such as nitrogen ions;

[0064] ④ Hydrogen: It can produce active particles such as hydrogen atoms and hydrogen ions.

[0065] At the same time, the air is ionized to produce negative oxygen ions (the principle is that the electrons released by the ionization of the air quickly combine with the neutral molecules in the air to become negative oxygen ions). Negative oxygen ions are a strong reducing agent. At this time, part of the air and negative oxygen ions in the insulating sleeve 131 are discharged into the graphite suspension in the purification box 11 through the connecting hole 134, the spiral insulating tube 132 and the through hole 133. The negative oxygen ions have a purification function and can purify the impurities in the graphite suspension. At the same time, the air pipe 138 is rotatably connected to the bottom end of the purification box 11 through a sealed bearing, and an external motor device and a transmission structure are used to drive the two insulating sleeves 131 to rotate (the specific settings of the motor and the transmission structure are existing common technologies, which will not be further described here). The negative oxygen ions and air discharged into the purification box 11 follow the rotation, so that the negative oxygen ions and air rise in the graphite suspension in a spiral state, thereby stirring the graphite suspension, prompting the negative oxygen ions and the graphite suspension, and the plasma active particles and the graphite suspension to mix quickly, thereby improving the purification efficiency.

[0066] An upper cylinder 136 is also provided at the top of the insulating sleeve 131 and the upper cylinder 136 is connected to the insulating sleeve 131. The upper cylinder 136 passes through the top of the purification box 11 and is fixedly connected to the purification box 11. The top of the insulating sleeve 131 is rotatably connected to the bottom of the upper cylinder 136, and the outside of the upper cylinder 136 is fixedly connected with an outlet pipe 137. The top of the electrode 12 passes through the upper cylinder 136 and extends out of the top of the upper cylinder 136, and the electrode 12 is fixedly connected to the upper cylinder 136. The air and other negative oxygen ions in the insulating sleeve 131 are discharged outside the purification box 11 via the upper cylinder 136 and the outlet pipe 137.

[0067] Then, the product discharged from the plasma activated purification component 1 is separated into solid and liquid in the centrifuge 2, and the solid product enters the alkali melting tank 3 for alkali melting treatment. The product treated with alkali melting enters the water washing tank 4 for water washing and then enters the acid hydrolysis tank 5. At the same time, the negative oxygen ions discharged from the purification box 11 are injected into the acid hydrolysis tank 5 as a reducing agent to perform acid hydrolysis on the product. The product treated with acid hydrolysis is washed with water in the water washing tank 6 and then enters the dryer 7 for drying to obtain purified graphite.

[0068] The purification process of the plasma activated graphite purification device of the present invention comprises the following specific steps:

[0069] S1: Graphite suspension is injected into the purification box 11, and then air is injected into the insulating sleeve 131 through the air pipe 138, and at the same time, working gas is injected into the purification box 11 through the gas pipe 14. The working gas is evenly distributed between the two electrodes 12 after being cut by the gas dividing plate 15. After the two electrodes 12 are connected with high-voltage alternating current, the working gas between the electrodes 12 is broken down and discharged to generate plasma active particles. The plasma active particles are generated in the graphite suspension and mixed with the graphite suspension at the same time, so that impurities are easily removed from the graphite;

[0070] At the same time, the air is ionized to generate negative oxygen ions. A part of the air and negative oxygen ions in the insulating sleeve 131 are discharged into the graphite suspension in the purification box 11 through the connecting hole 134, the spiral insulating tube 132 and the through hole 133. The negative oxygen ions can purify the impurities in the graphite suspension. At the same time, the two insulating sleeves 131 are driven to rotate so that the negative oxygen ions and air discharged into the purification box 11 rise in a spiral state in the graphite suspension, stirring the graphite suspension, promoting the rapid mixing of negative oxygen ions and graphite suspension, plasma active particles and graphite suspension, and improving the purification efficiency.

[0071] S2, solid-liquid separation: the product in S1 is separated into solid and liquid in centrifuge 2;

[0072] S3, alkali melting treatment: the solid product in S2 is transported into an alkali melting tank 3, sodium hydroxide is added, and a reaction is carried out at a high temperature, so that impurities (such as silicate, aluminosilicate, quartz, etc.) in the solid product react chemically with sodium hydroxide to generate soluble sodium silicate or acid-soluble sodium aluminosilicate;

[0073] S4, first water washing: the product in S3 enters the water washing tank-4 for water washing;

[0074] S5, acid hydrolysis treatment: the product in S4 is transported to the acid hydrolysis tank 5, and the negative oxygen ions discharged from the purification box 11 are transported to the acid hydrolysis tank 5 as a reducing agent. Other reducing agents (such as hydrazine hydrate, pure hydrazine, NaOH solution of hydroquinone, etc.) can also be added to react at room temperature, so that another part of the impurities (such as metal oxides, etc.) react with the reducing agent;

[0075] S6, second water washing: the product in S5 is transported to the water washing tank 26 for water washing;

[0076] S7, drying: the product in S6 is transported to the dryer 7 for drying to complete the purification of graphite.

[0077] Based on the above content and the accompanying drawings, those skilled in the art can understand and implement the present invention. In addition, any non-creative modifications made to the present invention by those skilled in the art without creative work still fall within the protection scope of the present invention.

Claims

1. A plasma activated graphite purification device, characterized in that: The invention comprises a plasma activated purification component (1), wherein the plasma activated purification component (1) comprises: A purification box (11), used for containing the graphite suspension to be purified; There are two electrodes (12), the two electrodes (12) are respectively located at two sides of the interior of the purification box (11) and extend out of the top of the purification box (11), and the two electrodes (12) are respectively a positive electrode and a negative electrode; Two insulating dielectric members (13) are provided, the two insulating dielectric members (13) are respectively located at two sides of the interior of the purification box (11) and extend out of the top of the purification box (11), and the two insulating dielectric members (13) are respectively sleeved outside the two electrodes (12) and used for dielectric barrier discharge of the two electrodes (12), so that the working gas injected between the two electrodes (12) discharges in the graphite suspension to generate plasma active particles that mix with the graphite suspension; Air is injected into the insulating dielectric member (13). Under air conditions, the insulating dielectric member (13) acts as an insulating medium for dielectric barrier discharge of the electrode (12). At the same time, air is ionized to generate negative oxygen ions, which are used for purification of graphite suspension and as a reducing agent for subsequent acid hydrolysis. The insulating dielectric member (13) comprises an insulating sleeve (131) arranged in the purification box (11), and the insulating sleeve (131) is arranged outside the electrode (12); a spiral insulating tube (132) is wound around the outer wall of the insulating sleeve (131); the outer wall of the insulating sleeve (131) is provided with connecting holes (134) in a spiral distribution on the inner side of the spiral insulating tube (132); the insulating sleeve (131) is connected to the spiral insulating tube (132) through the connecting holes (134); and the outer wall of the spiral insulating tube (132) is provided with a plurality of through holes (133); The invention is characterized in that the bottom end of the insulating sleeve (131) is fixedly connected to an air pipe (138), the air pipe (138) passes through the bottom end of the purification box (11) and is used to connect to an air source, and the air is transported into the insulating sleeve (131) through the air pipe (138); The air pipe (138) is rotatably connected to the bottom end of the purification box (11), and the top end of the insulating sleeve (131) is rotatably connected to the bottom end of the upper cylinder (136), so that the insulating sleeve (131) can rotate, so that the negative oxygen ions and air discharged into the purification box (11) rise in a spiral state, thereby stirring the graphite suspension, thereby promoting rapid mixing of the negative oxygen ions and the graphite suspension, and the plasma active particles and the graphite suspension.

2. A plasma activated graphite purification device according to claim 1, characterized in that: An upper tube (136) is provided at the top of the insulating sleeve (131), and the upper tube (136) is in communication with the insulating sleeve (131); the upper tube (136) passes through the top of the purification box (11) and is fixedly connected to the purification box (11); an outlet pipe (137) is fixedly connected to the outside of the upper tube (136); the top of the electrode (12) passes through the upper tube (136) and extends out of the top of the upper tube (136); and the electrode (12) is fixedly connected to the upper tube (136); A portion of the air and negative oxygen ions in the insulating sleeve (131) are discharged from the purification box (11) via the upper cylinder (136) and the outlet pipe (137), and another portion of the air and negative oxygen ions in the insulating sleeve (131) are discharged into the graphite suspension in the purification box (11) via the connecting hole (134), the spiral insulating tube (132) and the through hole (133) for purification of the graphite suspension.

3. A plasma activated graphite purification device according to claim 1, characterized in that: A gas pipe (14) is fixedly connected to the center of the bottom end of the purification box (11), and the gas pipe (14) is connected to a gas source. The working gas is transported into between two insulating dielectric components (13) in the purification box (11) through the gas pipe (14), and plasma active particles are generated through dielectric barrier discharge. The plasma active particles are mixed with the graphite suspension. A gas dividing plate (15) is fixed at the bottom of the purification box (11). The gas dividing plate (15) is located between the two insulating dielectric members (13) and at the top of the gas pipe (14). The gas dividing plate (15) comprises an outer frame (151) and a mesh plate (152) fixed inside the outer frame (151). The mesh plate (152) is composed of a plurality of longitudinal plates and a plurality of transverse plates, and the longitudinal plates and the transverse plates are both triangular in cross section, and are used to divide the working gas.

4. A plasma activated graphite purification device according to claim 2, characterized in that: A waterproof and breathable membrane (135) is fixed inside the through hole (133) and the gas tube (14) to prevent the graphite suspension from entering the spiral insulating tube (132) and the gas tube (14).

5. A plasma activated graphite purification device according to claim 1, characterized in that: A liquid inlet pipe (16) is fixed on the top of one side of the purification box (11) to facilitate the injection of graphite suspension into the purification box (11), and a liquid discharge pipe (17) is fixed on the bottom of the other side of the purification box (11) to facilitate the discharge of the treated product.

6. The plasma activated graphite purification device according to claim 1, characterized in that: The output end of the plasma activation purification component (1) is connected in sequence to a centrifuge (2), an alkali melting tank (3), a first water washing tank (4), an acid hydrolysis tank (5), a second water washing tank (6) and a dryer (7); The product discharged from the plasma activated purification component (1) is separated into solid and liquid in a centrifuge (2), and the solid product enters an alkali melting tank (3) for alkali melting treatment. The product after alkali melting treatment enters a water washing tank (4) for water washing and then enters an acid hydrolysis tank (5). At the same time, the negative oxygen ions discharged from the purification box (11) are transported to the acid hydrolysis tank (5) as a reducing agent for acid hydrolysis treatment. The product after acid hydrolysis treatment is washed by a water washing tank (6) and then enters a dryer (7) for drying to obtain purified graphite.

7. The purification process of the plasma activated graphite purification device according to any one of claims 1 to 6, characterized in that: The specific steps are as follows: S1: a graphite suspension is injected into a purification box (11), air is injected into an insulating sleeve (131), and a working gas is injected between two electrodes (12) in the purification box (11). After a high voltage alternating current is passed through the two electrodes (12), the working gas between the electrodes (12) is broken down and discharged to generate plasma active particles. The plasma active particles are generated in the graphite suspension and mixed with the graphite suspension at the same time, so that impurities are easily removed from the graphite. At the same time, the air is ionized to generate negative oxygen ions, and part of the air and negative oxygen ions in the insulating sleeve (131) are discharged into the graphite suspension in the purification box (11) through the connecting hole (134), the spiral insulating tube (132) and the through hole (133). The negative oxygen ions can purify the impurities in the graphite suspension. At the same time, the insulating sleeve (131) rotates so that the negative oxygen ions and air discharged into the purification box (11) rise in a spiral state in the graphite suspension, stirring the graphite suspension, thereby promoting rapid mixing of the negative oxygen ions and the graphite suspension, and the plasma active particles and the graphite suspension; S2, solid-liquid separation: The product in S1 is separated into solid and liquid in a centrifuge (2); S3, alkali melting treatment: the solid product in S2 is transported into an alkali melting tank (3), sodium hydroxide is added, and a reaction is carried out at a high temperature, so that impurities in the solid product react with the sodium hydroxide to generate soluble sodium silicate or acid-soluble sodium aluminosilicate; S4, first water wash: the product in S3 enters water wash tank one (4) for water washing; S5, acid hydrolysis treatment: the product in S4 is transported into the acid hydrolysis tank (5), and at the same time, the negative oxygen ions discharged from the purification tank (11) are transported into the acid hydrolysis tank (5) as a reducing agent, and react at room temperature, so that another part of the impurities react with the reducing agent; S6, second water washing: the product in S5 is transported to the second water washing tank (6) for water washing; S7, drying: the product in S6 is transported to a dryer (7) for drying to complete the purification of graphite.

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