Material selection device and material selection method for preparing graphite paper

Abstract

The present invention relates to a material selection device and a material selection method for preparing graphite paper, which are used in the technical field of graphite paper preparation. It includes a puffing furnace, a burner, a slag collecting box, a primary cyclone dust collector, a secondary cyclone dust collector, a tertiary cyclone dust collector, a quaternary cyclone dust collector, a fan, a graphite paper machine, a chimney, a primary feed pipe, a primary discharge pipe, a distributor, a secondary feed pipe, a secondary discharge pipe, and a tertiary discharge pipe. The gas pipe is arranged at the lower end of the puffing furnace, and the burner is connected to the gas pipe through the gas port; the puffing furnace feed pipe is obliquely inserted into the gas pipe through the side wall of the puffing furnace, and the upper end of the puffing furnace feed pipe is the feed port; the lower end of the puffing furnace is provided with a slag discharge port. The invention has a simple structure, is easy to manufacture, and has a good material selection effect. The actual promotion and application as well as the detection and evaluation by the relevant departments show that the device has advanced technology, stable operation, environmental protection can reach international standards, and the material selection method is simple and easy.

Description

Technical Field

[0001] The invention belongs to the technical field of graphite paper preparation, and specifically relates to a material selection device and a material selection method for preparing graphite paper. Background Art

[0002] Graphite paper is the basic material for manufacturing various graphite seals and is widely used in laptop computers, flat panel displays, digital cameras, mobile phones and other devices. Graphite paper is made by pressing expandable graphite. Expandable graphite is a graphite with interlayer intercalation formed by inserting compounds between graphite sheets through oxidation intercalation reaction of natural flake graphite. During the expansion process of graphite, it is necessary to vaporize the interlayer intercalation rapidly under high temperature. The formed gas will produce a huge supporting tension on the graphite sheets, causing the expandable graphite to expand by tens to hundreds or even thousands of times. The apparent volume after expansion is 250-300mL / g or more. The expanded graphite is worm-like, with a size ranging from a few millimeters to several millimeters. It has a large number of unique network-like microporous structures inside, which is called expanded graphite or graphite worms.

[0003] Graphite expands in a heating expansion furnace. The expanded graphite is called worms during the expansion process. Some graphite is not fully expanded or cannot expand into worms, which are called dead worms. In the process of preparing graphite paper, expanded graphite worms are needed to press graphite paper. If unexpanded graphite or dead worms are mixed into the worms, the quality of the pressed graphite paper will be affected. Therefore, in the process of preparing graphite paper, impurities in expandable graphite, graphite that cannot expand, and dead worms need to be separated.

[0004] The heating expansion furnace is an expansion heating furnace. After the graphite comes down from the feed port, it is heated by the adjustable burner flame and expands rapidly. Under the action of the adjustable burner hot air and fan, it is sent to the expansion furnace for further expansion. Due to the strong wind force, the expanded graphite is directly transported away, and the dead worms or unexpanded graphite and impurities fall to the front of the adjustable burner flame to continue expanding or broken by wind. In this way, during the expansion process, only a small amount of graphite impurities are discharged from the slag discharge port of the expansion heating furnace. After the expanded graphite is dusted once, most of the graphite worms are separated, resulting in a great waste of raw materials and greatly reducing the utilization rate of expanded graphite.

[0005] Therefore, in the traditional process, the expandable graphite discharged from the puffing furnace may be mixed with unexpanded graphite, dead worms or impurities. It is simply dusted through the slag discharge port of the puffing furnace and enters the graphite paper machine to press graphite paper. The impurities are not completely removed and the graphite dust does not meet the emission standards, causing the process equipment environment to be covered with graphite dust. A lot of unexpanded graphite and dead worms enter the graphite paper machine. The worms, dead worms and impurities cannot be fully separated, and the quality of the prepared graphite paper cannot be guaranteed.

[0006] In order to solve this problem, it is of great significance to study a device with simple structure, easy operation, and good ability to separate worms from dead worms and a material selection method to select high-quality graphite paper raw materials. Summary of the invention

[0007] The present invention solves the technical problem through the following technical solutions. The material selection device for preparing graphite paper comprises an expansion furnace, a burner, a slag collecting box, a primary cyclone dust collector, a secondary cyclone dust collector, a tertiary cyclone dust collector, a quaternary cyclone dust collector, a fan, a graphite paper machine, a chimney, a primary feed pipe, a primary discharge pipe, a distributor, a secondary feed pipe, a secondary discharge pipe, and a tertiary discharge pipe.

[0008] The expansion furnace includes a feed port, a gas port, a gas pipe, a slag discharge port, a discharge port, and a feed pipe of the expansion furnace. The gas pipe is arranged at the lower end of the expansion furnace, and the burner is connected to the gas pipe through the gas port; the feed pipe of the expansion furnace is obliquely inserted into the gas pipe through the side wall of the expansion furnace, and the upper end of the feed pipe of the expansion furnace is the feed port; the slag discharge port is arranged at the lower end of the expansion furnace, and the discharge port is arranged on the opposite side of the side where the feed pipe of the expansion furnace is located.

[0009] The slag collecting box is a rectangular box body, including a first slag ash port, a second slag ash port, a third slag ash port, a fourth slag ash port, a secondary dust collector discharge port, a tertiary dust collector discharge port, a fourth dust collector discharge port, and a slag collecting box outlet; the first slag ash port is opposite to the secondary dust collector discharge port, the second slag ash port is opposite to the third dust collector discharge port, the third slag ash port is opposite to the fourth dust collector discharge port, the slag collecting box discharge port is at the rear end of the slag collecting box, and the fourth slag ash port is opposite to the slag collecting box discharge port; the slag collecting box discharge port is connected to a primary feed pipe.

[0010] The first-stage cyclone dust collector includes a first-stage dust collector feed port and a first-stage dust collector discharge port. The first-stage dust collector feed port is on the side, and the first-stage dust collector discharge port is on the top. The first-stage dust collector feed port is connected to the first-stage feed pipe, and the first-stage dust collector discharge port is connected to the first-stage discharge pipe. The lower end of the first-stage discharge pipe is connected to the fan, and the fan outlet is connected to the second-stage feed pipe. The second-stage feed pipe and the second-stage discharge pipe are connected to the second-stage cyclone dust collector. The second-stage discharge pipe is connected to the third-stage cyclone dust collector. The upper end of the third-stage cyclone dust collector is connected to the third-stage discharge pipe, and the third-stage discharge pipe is connected to the chimney of the fourth-stage cyclone dust collector.

[0011] The distributor is connected to the lower end of the primary cyclone dust collector, the graphite paper machine is at the lower end of the distributor, and the expanded graphite is evenly distributed in the graphite paper machine through the distributor.

[0012] Optimally, the cross section of the primary feed pipe is smaller than that of the slag collecting box. As the cross section is reduced, the speed of material flow therein is increased, and impurities and dead insects can be effectively removed.

[0013] The material selection method of this invention is as follows:

[0014] First, expandable graphite is added from the feed port of the expansion furnace and enters the gas pipe;

[0015] Second, the burner generates gas, which is injected into the gas pipe through the gas port;

[0016] Third, the added expandable graphite raw material meets the gas coming from the gas port, and is heated by the gas of the burner, and the expandable graphite expands rapidly; under the action of the hot air of the burner, the expandable graphite is sent to the expansion furnace for expansion;

[0017] Due to the strong wind force, the lighter expanded graphite is directly transported away, and the heavier graphite (dead insects or unexpanded) falls to the front of the burner flame to continue expanding or be broken by wind. In this way, during the expansion process, only a small amount of graphite impurities are discharged from the slag discharge port of the expansion furnace.

[0018] Fourth, the expanded graphite is discharged from the discharge port of the expansion furnace and enters the slag box, and graphite impurities, dead insects, and unexpanded graphite are discharged from the slag discharge port of the expansion furnace. At this time, most of the graphite is sent to the primary cyclone dust collector through the discharge port of the slag box.

[0019] Fifth, after the expanded graphite comes out of the expansion furnace, it enters the slag collecting box. When the gas flow rate decreases and the conveying wind speed decreases, the movement speed of the particles in the expanded graphite gradually decreases, resulting in uneven flow and irregular pulsation.

[0020] The heavier impurities in the expanded graphite are precipitated into the slag box by controlling the wind speed change. Since the mass of large impurities is much greater than that of expanded graphite, the lighter expanded graphite and smaller dead insects are transported by pneumatic force into the first-stage feed pipe. Since the cross-sectional area of ​​the first-stage feed pipe is reduced, the flow rate is accelerated and the first-stage cyclone dust collector is entered through the feed port of the first-stage dust collector. Large impurities are deposited in the slag box, and the slag box is cleaned regularly.

[0021] Sixth, after the material enters the primary cyclone dust collector, the particles are separated from the airflow and captured on the wall by centrifugal force, and then the particles are deposited at the bottom by gravity, and the expanded graphite is quantitatively transported to the graphite paper machine through the star-shaped discharger.

[0022] Seventh, the efficiency of the first-stage cyclone dust collector can reach 85%, but 15% of the materials still cannot enter the graphite paper machine and are wasted. Therefore, the selection of graphite paper materials can achieve full utilization and recycling of expandable graphite without wasting raw materials.

[0023] Eighth, the exhaust gas from the first-stage cyclone dust collector enters the second-stage cyclone dust collector through the first-stage discharge pipe and the second-stage feed pipe under the action of the fan. The particles are separated from the airflow and captured on the wall by centrifugal force, and then the particles are deposited into the slag collecting box by gravity, and then enter the first-stage cyclone dust collector together with the materials from the expansion furnace.

[0024] Ninth, the exhaust gas from the secondary cyclone dust collector enters the third-stage cyclone dust collector through the secondary discharge pipe. The particles are separated from the airflow and captured on the wall by centrifugal force, and then the particles are deposited into the slag collecting box by gravity, and then enter the first-stage cyclone dust collector together with the materials from the expansion furnace.

[0025] Tenth, the exhaust gas from the third-stage cyclone dust collector enters the fourth-stage cyclone dust collector through the third-stage discharge pipe. The particles are separated from the airflow and captured on the wall by centrifugal force. Then, the particles are deposited into the slag collecting box by gravity and enter the first-stage cyclone dust collector together with the materials from the expansion furnace.

[0026] Eleventh, the exhaust gas from the four-stage cyclone dust collector is discharged through the chimney. The material inside the four-stage cyclone dust collector uses centrifugal force to separate the particles from the airflow and capture them on the wall of the device. Then, with the help of gravity, the particles are deposited into the slag box and the material from the expansion furnace enters the first-stage cyclone dust collector.

[0027] In this way, during the transportation process, the materials after the slag discharge of the expansion furnace and the four-stage cyclone dust collector enter the system to form a dust removal and material selection system with increased transportation concentration, increased pressure loss, and increased dust removal efficiency. The dust removal efficiency of the cyclone dust collector is 80%-85%, and the dust removal efficiency of the slag discharge of the expansion furnace and the four-stage cyclone dust collector can reach 0.032%--0.0076%. The national regulations stipulate that the dust content of the tail gas is ≤50mg / m³, that is, the instantaneous concentration of pneumatically conveyed graphite is ≤156.25g / m³ to meet the requirements.

[0028] During the trial stage, the production output of the device is 2.5 tons per day, 20 hours per day, equivalent to 125 kilograms per hour, and the fan air volume is calculated according to 1688-3517 cubic meters / hour, taking the minimum value of 1688 cubic meters / hour, and the fluctuation coefficient is 2, so that 148 grams of material can be transported per cubic meter. 148 grams / m³≤156.25 grams / m³. Through theoretical calculations and actual tests, the exhaust gas discharged from the chimney meets the national standards.

[0029] The invention has a simple structure, is easy to manufacture, and has good material selection effects. Actual promotion and application as well as testing and evaluation by relevant departments have shown that the device has advanced technology, stable operation, environmental protection that meets international standards, and a feasible technical method. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Attached Figure 1It is a schematic structural diagram of the material selection device of the present invention.

[0031] Diagram:

[0032] 1 expansion furnace, 2 burner, 3 slag collecting box, 4 primary cyclone dust collector, 5 secondary cyclone dust collector, 6 third-stage cyclone dust collector, 7 fourth-stage cyclone dust collector, 8 fan, 9 graphite paper machine, 10 chimney, 11 primary feed pipe, 12 primary discharge pipe, 13 distributor, 14 secondary feed pipe, 15 secondary discharge pipe, 16 third-stage discharge pipe;

[0033] 1-1 feed port, 1-2 gas port, 1-3 gas pipe, 1-4 slag discharge port, 1-5 discharge port, 1-6 expansion furnace feed pipe;

[0034] 3-1 first slag ash outlet, 3-2 second slag ash outlet, 3-3 third slag ash outlet, 3-4 fourth slag ash outlet, 3-5 second-stage dust collector discharge port, 3-6 third-stage dust collector discharge port, 3-7 fourth-stage dust collector discharge port, 3-8 slag box outlet;

[0035] 4-1 is the feed inlet of the first-stage dust collector, and 4-2 is the discharge outlet of the first-stage dust collector. DETAILED DESCRIPTION

[0036] As attached Figure 1 As shown, the material selection device for preparing graphite paper includes an expansion furnace 1, a burner 2, a slag collecting box 3, a primary cyclone dust collector 4, a secondary cyclone dust collector 5, a tertiary cyclone dust collector 6, a fourth-stage cyclone dust collector 7, a fan 8, a graphite paper machine 9, a chimney 10, a primary feed pipe 11, a primary discharge pipe 12, a distributor 13, a secondary feed pipe 14, a secondary discharge pipe 15, and a tertiary discharge pipe 16.

[0037] The puffing furnace 1 comprises a feed port 1-1, a gas port 1-2, a gas pipe 1-3, a slag discharge port 1-4, a discharge port 1-5, and a puffing furnace feed pipe 1-6. The gas pipe 1-3 is arranged at the lower end of the puffing furnace 1, and the burner 2 is connected to the gas pipe 1-3 through the gas port 1-2; the puffing furnace feed pipe 1-6 is obliquely inserted into the gas pipe 1-3 through the side wall of the puffing furnace 1, and the upper end of the puffing furnace feed pipe 1-6 is the feed port 1-1; the slag discharge port 1-4 is arranged at the lower end of the puffing furnace 1, and the discharge port 1-5 is arranged on the opposite side of the side where the puffing furnace feed pipe 1-6 is located.

[0038] The slag collecting box 3 is a rectangular box body, including a first slag ash opening 3-1, a second slag ash opening 3-2, a third slag ash opening 3-3, a fourth slag ash opening 3-4, a secondary dust collector discharge opening 3-5, a tertiary dust collector discharge opening 3-6, a fourth dust collector discharge opening 3-7, and a slag collecting box outlet 3-8; the first slag ash opening 3-1 is opposite to the secondary dust collector discharge opening 3-5, the second slag ash opening 3-2 is opposite to the tertiary dust collector discharge opening 3-6, the third slag ash opening 3-3 is opposite to the fourth dust collector discharge opening 3-7, the slag collecting box discharge opening 3-8 is at the rear end of the slag collecting box 3, and the fourth slag ash opening 3-4 is opposite to the slag collecting box discharge opening 3-8; the slag collecting box discharge opening 3-8 is connected to the primary feed pipe 11.

[0039] The primary cyclone dust collector 4 includes a primary dust collector feed port 4-1 and a primary dust collector discharge port 4-2, wherein the primary dust collector feed port 4-1 is on the side and the primary dust collector discharge port 4-2 is on the top. The primary dust collector feed port 4-1 is connected to a primary feed pipe 11, and the primary dust collector discharge port 4-2 is connected to a primary discharge pipe 12. The lower end of the primary discharge pipe 12 is connected to a fan 8, and the outlet of the fan 8 is connected to a secondary feed pipe 14. The secondary feed pipe 14 and the secondary discharge pipe 15 are connected to the secondary cyclone dust collector 5, and the secondary discharge pipe 15 is connected to the tertiary cyclone dust collector 6. The upper end of the tertiary cyclone dust collector 6 is connected to a tertiary discharge pipe 16, and the tertiary discharge pipe 16 is connected to the chimney 10 of the quaternary cyclone dust collector 7.

[0040] The distributor 13 is connected to the lower end of the primary cyclone dust collector 4 , the graphite paper machine 9 is at the lower end of the distributor 13 , and the expanded graphite is evenly distributed in the graphite paper machine 9 through the distributor 13 .

[0041] Optimally, the cross section of the primary feed pipe 11 is smaller than the cross section of the slag collecting box 3. Due to the reduction in the cross section, the speed of material flow therein is increased, and impurities and dead insects can be effectively removed.

[0042] When the invention is working, expandable graphite is added from the feed port 1-1 of the expansion furnace 1 and first enters the gas pipe. The gas generated by the burner 2 is injected into the gas pipe 1-3 through the gas port 1-2. The added expandable graphite raw material meets the gas coming from the gas port 1-2. The expandable graphite is heated by the gas of the burner 2, and expands rapidly. Under the action of the hot air of the burner 2, the expandable graphite is sent to the expansion furnace 1 for further expansion. Due to the strong wind force, the lighter expandable graphite is directly transported away, and the heavier graphite (dead insects or unexpanded) falls to the front end of the flame of the burner 2 to continue expanding or be broken by wind. In this way, during the expansion process, only a small amount of graphite impurities are discharged from the slag discharge port 1-4 of the expansion furnace 1, and the expandable graphite is discharged through the discharge port 1-5 of the expansion furnace 1 and enters the slag collecting box 3. Graphite impurities, dead insects, and unexpanded graphite are discharged from the slag discharge port 1-4 of the expansion furnace 1. At this time, most of the graphite is sent to the primary cyclone dust collector 4 through the slag box discharge port 3-8.

[0043] After the expanded graphite comes out of the expansion furnace 1, it enters the slag box 3. When the gas flow rate decreases and the conveying wind speed decreases, the movement speed of the particles in the expanded graphite gradually decreases, thereby generating uneven flow and irregular pulsation. The heavier impurities in the expanded graphite are sunk into the slag box by controlling the wind speed change. Since the mass of large particle impurities is much greater than that of expanded graphite, the lighter expanded graphite and smaller dead insects are transported by pneumatic force into the primary feed pipe 11. Since the cross-sectional area of ​​the primary feed pipe 11 becomes smaller, the flow rate is accelerated, and the primary cyclone dust collector 4 is entered through the primary dust collector feed port 4-1. Large particle impurities are deposited in the slag box 3, and the slag box is cleaned regularly.

[0044] After the material enters the primary cyclone dust collector 4, the particles are separated from the airflow and captured on the wall by centrifugal force, and then the particles are deposited at the bottom by gravity, and are quantitatively transported to the graphite paper machine 9 through the star-shaped discharger. The efficiency of the primary cyclone dust collector 4 can reach 85%, and 15% of the material cannot enter the graphite paper machine and is wasted. Therefore, the selection of graphite paper can achieve full utilization and recovery of expandable graphite without waste of raw materials.

[0045] The exhaust gas from the primary cyclone dust collector 4 enters the secondary cyclone dust collector 5 through the primary discharge pipe 12 and the secondary feed pipe 14 under the action of the fan 8, and the particles are separated from the airflow and captured on the wall by centrifugal force, and then the particles are deposited in the slag collecting box 3 by gravity, and then enter the primary cyclone dust collector 4 together with the materials from the expansion furnace.

[0046] The exhaust gas from the secondary cyclone dust collector 5 enters the tertiary cyclone dust collector 6 through the secondary discharge pipe 15, and the particles are separated from the airflow and captured on the wall by centrifugal force, and then the particles are deposited into the slag collecting box 3 by gravity, and then enter the primary cyclone dust collector 4 together with the materials from the expansion furnace.

[0047] The exhaust gas from the third-stage cyclone dust collector 6 enters the fourth-stage cyclone dust collector 7 through the third-stage discharge pipe 16, and the particles are separated from the airflow and captured on the wall by centrifugal force, and then the particles are deposited into the slag collecting box 3 by gravity, and then enter the first-stage cyclone dust collector 4 together with the materials from the expansion furnace.

[0048] The exhaust gas from the four-stage cyclone dust collector 7 is discharged through the chimney 10. The material inside the four-stage cyclone dust collector 7 is separated from the airflow by centrifugal force and captured on the wall. Then, the particles are deposited into the slag collecting box 3 by gravity, and the material from the expansion furnace enters the first-stage cyclone dust collector 4.

[0049] In this way, during the transportation process, the materials after the slag discharge of the expansion furnace 1 and the four-stage cyclone dust collector enter the system to form a dust removal and material selection system with increased transportation concentration, increased pressure loss, and increased dust removal efficiency. The dust removal efficiency of the cyclone dust collector is 80%-85%, and the dust removal efficiency of the slag discharge of the expansion furnace and the four-stage cyclone dust collector can reach 0.032%--0.0076%. The national regulations stipulate that the dust content of the tail gas is ≤50mg / m³, that is, the instantaneous concentration of pneumatically conveyed graphite is ≤156.25g / m³ to meet the requirements.

[0050] During the trial stage, the device produced 2.5 tons of expanded graphite per day, 20 hours per day, equivalent to 125 kg per hour. The fan air volume was calculated according to 1688-3517 cubic meters per hour, taking the minimum value of 1688 cubic meters per hour, and the fluctuation coefficient was 2, so that 148 grams of material could be transported per cubic meter. 148 grams / m³≤156.25 grams / m³. Through theoretical calculation and actual testing, the exhaust gas discharged from the chimney meets the national standard requirements.

[0051] The invention has a simple structure, is easy to manufacture, and has good material selection effects. Actual promotion and application as well as testing and evaluation by relevant departments have shown that the device has advanced technology, stable operation, environmental protection that meets international standards, and a feasible technical method.

Claims

1. A graphite paper material selection device, characterized in that: The invention comprises an expansion furnace, a burner, a slag collecting box, a primary cyclone dust collector, a secondary cyclone dust collector, a third cyclone dust collector, a fourth cyclone dust collector, a fan, a graphite paper machine, a chimney, a primary feed pipe, a primary discharge pipe, a distributor, a secondary feed pipe, a secondary discharge pipe, and a third discharge pipe; the expansion furnace comprises a feed port, a gas port, a gas pipe, a slag discharge port, a discharge port, and an expansion furnace feed pipe. A slag discharge port is arranged at the lower end of the expansion furnace, and a discharge port is arranged on the opposite side of the side where the expansion furnace feed pipe is located; the slag collecting box comprises a first slag ash port, a second slag ash port, a third slag ash port, and a fourth slag ash port. Ash port, discharge port of secondary dust collector, discharge port of tertiary dust collector, discharge port of quaternary dust collector, and slag box outlet; the first slag ash port is opposite to the discharge port of secondary dust collector, the second slag ash port is opposite to the discharge port of tertiary dust collector, the third slag ash port is opposite to the discharge port of quaternary dust collector, the discharge port of slag box is at the tail end of slag box, the fourth slag ash port is opposite to the discharge port of slag box, and the discharge port of slag box is connected to the first-level feed pipe; the first-level cyclone dust collector includes the first-level dust collector feed port and the first-level dust collector discharge port, the first-level dust collector feed port is on the side, and the first-level dust collector discharge port is on the top; The gas pipe is arranged at the lower end of the expansion furnace, and the burner is connected to the gas pipe through the gas port; the feed pipe of the expansion furnace is obliquely inserted into the gas pipe through the side wall of the expansion furnace, and the upper end of the feed pipe of the expansion furnace is the feed port; The slag collecting box is a rectangular box, and the cross section of the primary feed pipe is smaller than that of the slag collecting box; The feed port of the first-stage dust collector is connected to the first-stage feed pipe, the discharge port of the first-stage dust collector is connected to the first-stage discharge pipe, the lower end of the first-stage discharge pipe is connected to the fan, the fan outlet is connected to the second-stage feed pipe, the second-stage feed pipe and the second-stage discharge pipe are connected to the second-stage cyclone dust collector, the second-stage discharge pipe is connected to the third-stage cyclone dust collector, the upper end of the third-stage cyclone dust collector is connected to the third-stage discharge pipe, and the third-stage discharge pipe is connected to the chimney of the fourth-stage cyclone dust collector.

2. A graphite paper material selection device according to claim 1, characterized in that: The distributor is connected to the lower end of the primary cyclone dust collector, the graphite paper machine is at the lower end of the distributor, and the expanded graphite is evenly distributed in the graphite paper machine through the distributor.

3. A method for preparing graphite paper, characterized in that: The steps include: First, expandable graphite is added from the feed port of the expansion furnace and enters the gas pipe; Second, the burner generates gas, which is injected into the gas pipe through the gas port; Third, the added expandable graphite raw material meets the gas coming from the gas port, and is heated by the gas of the burner, so that the expandable graphite expands rapidly; a small amount of graphite impurities are discharged from the slag discharge port of the expansion furnace; Fourth, the expanded graphite is discharged from the discharge port of the expansion furnace and enters the slag collecting box, and graphite impurities, dead insects, and unexpanded graphite are discharged from the slag discharge port of the expansion furnace; Fifth, the expanded graphite enters the primary cyclone dust collector, where the particles are separated from the airflow and captured on the wall by centrifugal force, and then the particles are deposited at the bottom by gravity, and then quantitatively transported to the graphite paper machine through the star-shaped discharger; The tail gas from the primary cyclone dust collector uses the function of the fan to enter the secondary cyclone dust collector through the primary discharge pipe and the secondary feed pipe. The centrifugal force is used to separate the particles from the airflow and capture them on the wall. Then, the particles are deposited into the slag collecting box by gravity and enter the primary cyclone dust collector together with the materials from the expansion furnace. The tail gas from the secondary cyclone dust collector enters the third-stage cyclone dust collector through the secondary discharge pipe. The particles are separated from the airflow and captured on the wall by centrifugal force. Then, the particles are deposited into the slag collecting box by gravity, and then enter the first-stage cyclone dust collector together with the materials from the expansion furnace. The tail gas from the third-stage cyclone dust collector enters the fourth-stage cyclone dust collector through the third-stage discharge pipe. The particles are separated from the airflow and captured on the wall by centrifugal force. Then, the particles are deposited into the slag collecting box by gravity and enter the first-stage cyclone dust collector together with the materials from the expansion furnace. The exhaust gas from the four-stage cyclone dust collector is discharged through the chimney. The material inside the four-stage cyclone dust collector uses centrifugal force to separate the particles from the airflow and capture them on the wall. Then, with the help of gravity, the particles are deposited into the slag box and the material from the expansion furnace enters the first-stage cyclone dust collector.

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