Impurity removal device for diamond micro-powder production

Abstract

The invention belongs to the technical field of pickling purification equipment, and particularly relates to an impurity removal device for diamond micro-powder production, which comprises: a base, the interior of which is provided with a cavity; the open groove is formed in the bottom of the base and communicates with the cavity, and a jacking table is arranged in an opening of the open groove in an embedded mode; the purification tank is externally connected with a feeding pipe, the bottom of the purification tank is arranged at the top of the jacking table, and the bottom of the purification tank is connected with the top of the jacking table through an external screw rod; the invention aims to realize synchronous trapping of ferromagnetic metal impurities in the pickling process by arranging an electromagnetic module in an isolation interlayer on the inner wall of a purification tank and combining the stirring effect of a stirring assembly, so that the metal impurities wrapped in a micro-powder aggregate are exposed and adsorbed by a magnetic field, and the problem of incomplete trapping of a traditional fixed magnetic field is improved. And meanwhile, the acid liquor in the tank can continuously wash the adsorbed metal impurities, so that the impurity removal effect is improved.

Description

Technical Field

[0001] This invention belongs to the technical field of acid washing and purification equipment, specifically relating to a purification device for diamond micron powder production. Background Technology

[0002] During the synthesis of diamond micron powder, metallic catalyst impurities such as iron, nickel, and cobalt remain. Traditional purification processes mainly rely on heating and dissolving highly corrosive acids such as nitric acid, aqua regia, and perchloric acid, followed by multiple water washings and filtrations to achieve solid-liquid separation.

[0003] Currently, during the pickling process, some large metal particles are difficult to be quickly penetrated and dissolved by the acid, resulting in problems such as long pickling time, large acid consumption, and high cost. In order to alleviate the above problems, users usually perform magnetic separation on diamond micro powder before pickling, using magnetic field adsorption to separate the iron metal impurities, thereby reducing the processing pressure of subsequent pickling.

[0004] However, traditional magnetic separation equipment mostly uses a fixed magnetic field structure, which makes it difficult to effectively capture metal particles encapsulated inside agglomerates in micro powder. Furthermore, since magnetic separation equipment and acid washing equipment are independent of each other, the transfer process is increased, and they also occupy independent production space. Summary of the Invention

[0005] In view of this, the present invention provides a device for removing impurities in the production of diamond micro powder. The purpose of this device is to provide a device that can simultaneously capture magnetic metal impurities during the acid washing reaction and fully mix the metal impurities with the acid solution.

[0006] The technical solution adopted in this invention is as follows: A purification device for diamond micron powder production includes: a base with a cavity inside; a slot at the bottom of the base and communicating with the cavity, wherein a lifting platform is fitted into the opening of the slot; a purification tank with an external feed pipe connected to it, the bottom of the purification tank being placed on top of the lifting platform, and the bottom of the purification tank and the top of the lifting platform being connected by an external screw; wherein an isolation layer is formed inside the inner wall of the purification tank, and an electromagnetic module including an electromagnetic coil is provided within the isolation layer.

[0007] In some embodiments, the purification tank has a stirring chamber, a partition, and a drain chamber arranged in sequence inside. The stirring chamber and the drain chamber are separated by the partition. The stirring chamber has a rotating shaft inside, and a plurality of stirring rods are provided on the shaft. The top of the partition has a mating interface adapted to the end of the rotating shaft.

[0008] In some embodiments, the rotating shaft is a hollow structure with a plurality of air holes on its surface. The end of the rotating shaft facing the interface has an opening, and the end of the rotating shaft with the opening extends to the drain chamber through the interface.

[0009] In some embodiments, a drive frame is provided inside the cavity, the bottom of the lifting platform is fixedly connected to the top of the drive frame, and a lifting mechanism is provided at the bottom of the drive frame.

[0010] In some embodiments, the top of the lifting platform is provided with an air pipe, and the bottom of the purification tank is provided with a docking hole, which is connected to the draining chamber. The air pipe is connected to the docking hole. A limiting sleeve is fitted on the air pipe, and a protrusion is provided on the limiting sleeve. A limiting groove adapted to the protrusion is provided on the inner wall of the docking hole.

[0011] In some embodiments, the system further includes: a first conduit disposed inside the cavity, one end of which passes through the inner wall of the base and is connected to a gas tank; a second conduit disposed inside the cavity, one end of which passes through the inner wall of the base and is connected to a waste liquid tank; a third conduit disposed inside the cavity and connected to the gas pipe; and a three-way valve, the three ports of which are respectively connected to the first conduit, the second conduit, and the third conduit; wherein, both the first conduit and the second conduit are equipped with vacuum pumps.

[0012] In some embodiments, a filter screen is laid on the surface of the partition, and the filter screen has filter holes that penetrate the partition. The partition is arranged in a conical structure, and a collar is fitted around the edge of the partition. An annular groove adapted to the collar is formed on the inner wall of the drainage chamber.

[0013] In some embodiments, the base is further provided with a support on top, and the support is provided with clamping rods, with two clamping rods distributed relative to each other with the purification tank as the center.

[0014] In some embodiments, a guide groove is provided on the surface of the purification tank, the guide groove extending along the height direction of the purification tank, wherein the end of the clamping rod away from the support is engaged with the guide groove.

[0015] In some embodiments, the purification tank is made of steel lined with polytetrafluoroethylene or PPH material, is completely sealed, and has a material inlet and a sealing cap adapted to the material inlet at the top.

[0016] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are: 1. This invention, by setting an electromagnetic module in the isolation jacket of the inner wall of the purification tank, combined with the stirring action of the stirring component, enables the simultaneous capture of ferromagnetic metal impurities during the acid washing process. This exposes the metal impurities encased in the micro powder agglomerates and allows them to be adsorbed by the magnetic field, improving the problem of incomplete capture by the traditional fixed magnetic field. At the same time, the acid in the tank can continuously flush away the adsorbed metal impurities, improving the impurity removal effect.

[0017] 2. This invention uses a lifting platform to drive the purification tank to move up and down, which, combined with the stirring effect of the stirring components, breaks up the agglomeration of diamond powder, avoids powder deposition, and at the same time makes the material evenly contact the magnetic field and acid solution, accelerates acid penetration and dissolution, shortens pickling time, reduces acid consumption, and lowers production costs.

[0018] 3. In this invention, gas is introduced into the mixture through the air holes and air pipes of the hollow rotating shaft to form microbubbles. The rising bubbles bring suspended metal impurities into contact with the magnetic field, and the impact force of the bursting bubbles further promotes the dispersion of agglomerates, thus synergistically improving the impurity removal efficiency and pickling effect.

[0019] 4. In this invention, the combination of the collar and the annular groove allows the partition to rotate together with the rotating shaft. During the stirring process, centrifugal force is used to throw the denser impurities toward the edge of the partition, while also further dispersing the micro powder accumulated on the partition. Attached Figure Description

[0020] The present invention will be described by way of example and with reference to the accompanying drawings, wherein: Figure 1 This is a schematic diagram of the impurity removal device for diamond micron powder production provided by the present invention.

[0021] Figure 2 This is a schematic diagram of the structure of the base provided by the present invention.

[0022] Figure 3 This is a schematic diagram of the internal structure of the base provided by the present invention.

[0023] Figure 4 This is a schematic diagram of the interior of the purification tank provided by the present invention.

[0024] Figure 5 This is a schematic diagram of the structure of the partition provided by the present invention.

[0025] Figure 6 This is a schematic diagram of the drainage chamber provided by the present invention.

[0026] Figure 7 This invention provides Figure 6 Enlarged diagram of point A in the middle.

[0027] Figure 8 This is a schematic diagram of the structure of the rotating shaft provided by the present invention.

[0028] 1. Base; 2. Slot; 3. Lifting platform; 4. Purification tank; 5. Feed pipe; 6. Guide groove; 7. Support; 8. Clamping rod; 9. Gas pipe; 10. Limiting sleeve; 11. Drive frame; 12. Lifting mechanism; 13. First guide pipe; 14. Second guide pipe; 15. Third guide pipe; 16. Three-way valve; 17. Vacuum pump; 18. Rotating shaft; 19. Stirring rod; 20. Partition plate; 21. Drainage chamber; 22. Docking hole; 23. Isolation jacket; 24. Electromagnetic module; 25. Filter screen; 26. Collar; 27. Docking interface; 28. Annular groove; 29. ​​Limiting groove; 30. Gas hole. Detailed Implementation

[0029] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention. Example

[0030] In existing technologies, during the pickling process, some large-particle metal impurities are difficult to be quickly dissolved by the acid solution, resulting in prolonged pickling time, increased acid consumption, and higher costs. To improve these issues, users typically perform magnetic separation on diamond micropowder before pickling, using a magnetic field to adsorb and separate ferrous metal impurities, thus reducing the processing pressure of subsequent pickling. However, traditional magnetic separation equipment often uses a fixed magnetic field structure, which is difficult to effectively capture metal particles encapsulated within agglomerates in the micropowder. Furthermore, since the magnetic separation equipment and pickling equipment are independent, this not only increases the transfer process but also occupies separate production spaces.

[0031] Therefore, in order to solve the above problems and achieve the function of simultaneously capturing magnetic metal impurities during the acid washing reaction and fully mixing the metal impurities with the acid solution, this invention discloses a purification device for diamond micron powder production. (See reference...) Figures 1-8 The system includes: a base 1, the base 1 having a cavity inside; a slot 2, the slot 2 being formed at the bottom of the base 1 and communicating with the cavity, the opening of the slot 2 being fitted with a lifting platform 3; a purification tank 4, the purification tank 4 being connected to a feed pipe 5, the bottom of the purification tank 4 being placed on top of the lifting platform 3, and the bottom of the purification tank 4 being connected to the top of the lifting platform 3 by an external screw; wherein, the inner wall of the purification tank 4 has an isolation layer 23, the isolation layer 23 having an electromagnetic module 24, the electromagnetic module 24 including an electromagnetic coil.

[0032] In this embodiment, an electromagnetic module 24 is installed in the isolation layer 23 on the inner wall of the purification tank 4. When the electromagnetic coil is energized, a magnetic field is generated. This magnetic field can penetrate into the stirring chamber and adsorb ferromagnetic metal impurities during the pickling process in real time. Simultaneously, the bottom of the purification tank 4 is connected to the lifting platform 3 via an external screw, facilitating disassembly or fixing of the purification tank 4 as needed. The lifting platform 3 can move up and down along the slot 2 under the action of the drive frame 11 and the lifting mechanism 12, thereby driving the purification tank 4 to perform lifting and lowering movements. This improves the mixing degree of the slurry inside the purification tank 4 and prevents diamond powder from depositing inside the tank. The external feed pipe 5 can transport the mixture of diamond powder and acid solution into the purification tank 4, where it is mixed under the action of the stirring components. The magnetic field generated by the electromagnetic module 24 can simultaneously capture metal impurities during the pickling process, effectively solving the problems of increased transfer processes and space occupation caused by the separation of traditional magnetic separation equipment and pickling equipment.

[0033] Specifically, the stirring assembly includes a rotating shaft 18 with several stirring rods 19 mounted on its shaft. A motor suitable for driving the rotating shaft 18 is located at the top of the purification tank 4. When the rotating shaft 18 rotates, the stirring rods 19 rotate accordingly, thoroughly stirring the mixture of diamond micron powder and acid solution within the stirring chamber. This disperses the material from an agglomerated state into fine particles, exposing the metal impurities encased within the agglomerates, making them easier for the magnetic field generated by the electromagnetic module 24 to adsorb and capture. Simultaneously, the centrifugal force generated by the stirring rods 19 helps to throw the acid solution and metal impurities towards the inner wall of the purification tank 4, allowing the metal impurities to approach the magnetic field area generated by the electromagnetic module 24, further improving adsorption efficiency. The acid solution also comes into full contact with the adsorbed metal impurities, accelerating the dissolution reaction.

[0034] Furthermore, the purification tank 4 is provided with a stirring chamber, a partition 20 and a drain chamber 21 arranged in sequence inside. The stirring chamber and the drain chamber 21 are separated by the partition 20. The rotating shaft 18 is a hollow structure with a number of air holes 30 on its surface. The end of the rotating shaft 18 facing the interface 27 has an opening, and the end of the rotating shaft 18 with the opening extends to the drain chamber 21 through the interface 27. This arrangement allows gas to be introduced into the mixture during stirring to form microbubbles. As the bubbles rise, they will carry some suspended metal impurities upward, increasing the probability of them coming into contact with the magnetic field. At the same time, the impact force generated when the bubbles burst can further promote the dispersion of agglomerates and improve the overall impurity removal effect.

[0035] Furthermore, the isolation jacket 23 prevents the electromagnetic module 24 from directly contacting the acid solution in the purification tank 4, effectively avoiding corrosion of the electromagnetic coil by the acid solution and extending the service life of the device. Simultaneously, the isolation jacket 23 also provides some insulation, reducing heat loss during the pickling process, maintaining the temperature environment required for the reaction, and helping to improve the dissolution efficiency of the acid solution for metallic impurities.

[0036] Preferably, the purification tank 4 is made of steel lined with polytetrafluoroethylene or PPH material, is completely sealed, and has a material outlet and a sealing cover adapted to the material outlet at the top. Example

[0037] Based on Embodiment 1, to enable the purification tank 4 to perform reciprocating lifting and lowering motion, a drive frame 11 is provided inside the cavity. The bottom of the lifting platform 3 is fixedly connected to the top of the drive frame 11, and a lifting mechanism 12 is provided at the bottom of the drive frame 11. The lifting mechanism 12 includes a lifting cylinder and a piston rod. The top of the piston rod is fixedly connected to the bottom of the drive frame 11. The lifting cylinder drives the drive frame 11 to move up and down along the inner wall of the cavity through the extension and retraction of the piston rod, thereby causing the lifting platform 3 to drive the purification tank 4 to lift and lower synchronously. When the purification tank 4 rises, the mixture inside it flows due to gravity, and when it falls, it forms a reverse impact. This reciprocating motion can further break up the agglomeration of materials, enhance the stirring effect, and also allow materials in different areas to be evenly contacted by the magnetic field generated by the electromagnetic module 24, avoiding the accumulation of local metal impurities that cannot be effectively adsorbed. In addition, a guide slider and a guide rail can be provided between the drive frame 11 and the inner wall of the cavity to ensure that the drive frame 11 remains stable during lifting and lowering, preventing the purification tank 4 from shaking or shifting, and ensuring the safety and stability of the equipment operation.

[0038] Furthermore, the top of the lifting platform 3 is equipped with a gas pipe 9, and the bottom of the purification tank 4 is provided with a docking hole 22, which communicates with the drain chamber 21. The gas pipe 9 is also connected to the docking hole 22. A limiting sleeve 10 is fitted onto the gas pipe 9. This structural design allows the gas pipe 9 to be positioned by the engagement of a protrusion and a limiting groove 29 when it is docked with the docking hole 22, preventing misalignment or detachment of the gas pipe 9 during ventilation and ensuring stable gas or liquid transmission. When the purification tank 4 needs to be disassembled, simply remove the screw and then remove the protrusion from the limiting groove 29 to separate the gas pipe 9 from the docking hole 22. This operation is convenient and the connection is secure. Simultaneously, the limiting sleeve 10 also provides support and protection for the gas pipe 9, reducing wear caused by frequent docking or movement and extending its service life.

[0039] In one embodiment, the limiting sleeve 10 is provided with a protrusion, and the inner wall of the docking hole 22 is provided with a limiting groove 29 adapted to the protrusion. Example

[0040] Based on Embodiment 2, in order to smoothly carry out the gas supply or filtration process on the purification tank 4, the following are also included: a first conduit 13, which is located inside the cavity, with one end of the first conduit 13 passing through the inner wall of the base 1 and connected to a gas tank; a second conduit 14, which is located inside the cavity, with one end of the second conduit 14 passing through the inner wall of the base 1 and connected to a waste liquid tank; a third conduit 15, which is located inside the cavity and connected to the gas pipe 9; and a three-way valve 16, whose three ports are respectively connected to the first conduit 13, the second conduit 14, and the third conduit 15; wherein, both the first conduit 13 and the second conduit 14 are equipped with vacuum pumps 17.

[0041] In this embodiment, the switching of the three-way valve 16 can realize the conversion between gas supply and filtration functions. When gas needs to be introduced into the purification tank 4, the three-way valve 16 is controlled to connect the first conduit 13 and the third conduit 15. At this time, the gas in the external gas tank enters the drain chamber 21 sequentially through the first conduit 13, the three-way valve 16, the third conduit 15, and the gas pipe 9. At the same time, some gas can enter the stirring chamber through the air hole 30 on the rotating shaft 18 to fully contact the mixed materials. When filtration is required, the three-way valve 16 is switched to connect the second conduit 14 and the third conduit 15. The vacuum pump 17 on the second conduit 14 is started, which can draw the waste liquid in the drain chamber 21 into the waste liquid tank through the gas pipe 9, the third conduit 15, and the second conduit 14 to complete the solid-liquid separation. The vacuum pump 17 on the first conduit 13 can accelerate the gas delivery efficiency, ensure that the gas enters the stirring chamber at a suitable pressure and flow rate, and improve the dispersion effect of bubbles on materials.

[0042] Specifically, a filter screen 25 is laid on the surface of the partition 20. The filter holes on the filter screen 25 penetrate the partition 20, and the pore size of the filter holes is smaller than the particle size of the diamond powder. When the gas pipe 9 sprays gas, some gas can enter the stirring chamber through the filter holes, thereby blowing up the diamond powder accumulated on the partition 20. Another part of the gas can enter the interior of the rotating shaft 18 through the opening at the end of the rotating shaft 18 and be sprayed out from the air holes 30 on the surface of the rotating shaft 18, forming multi-directional airflow disturbance.

[0043] When air is drawn from the vent pipe 9, the acid in the stirring chamber enters the drain chamber 21 through the filter holes under the pressure difference, while the diamond powder is trapped by the filter screen 25, achieving solid-liquid separation. Because the baffle 20 has a conical structure, it guides the liquid to flow towards the edge, reducing the accumulation of powder in the central area of ​​the baffle 20 and improving filtration efficiency. The filter screen 25 is made of acid-resistant material, maintaining stable filtration performance during long-term use and preventing damage from acid to the filter screen 25 that would affect the separation effect.

[0044] Furthermore, a collar 26 is fitted around the edge of the partition 20, and an annular groove 28 adapted to the collar 26 is formed on the inner wall of the drainage chamber 21. This arrangement allows the partition 20 to rotate together when the rotating shaft 18 rotates, and the collar 26 slides within the annular groove 28, thereby causing the filter screen 25 to rotate. The rotating filter screen 25 generates centrifugal force on the diamond powder trapped on its surface, throwing the powder towards the edge, preventing the powder from accumulating locally on the filter screen 25 and causing filter pore blockage, thus further improving filtration efficiency. At the same time, the rotation of the filter screen 25 can also work synergistically with the stirring action of the stirring rod 19, making the material in the stirring chamber more evenly mixed and reducing dead zones caused by uneven material distribution. Wear-resistant gaskets can be placed between the collar 26 and the annular groove 28 to reduce frictional loss during relative movement and extend the service life of the device. Example

[0045] Based on Embodiment 1, in order to improve the stability of the purification tank 4 during lifting, the top of the base 1 is also provided with a support 7, and the support 7 is provided with clamping rods 8. The two clamping rods 8 are distributed relative to each other with the purification tank 4 as the center. The surface of the purification tank 4 is provided with a guide groove 6, which extends along the height direction of the purification tank 4. The end of the clamping rod 8 away from the support 7 is engaged with the guide groove 6.

[0046] In this embodiment, the two clamping rods 8, by engaging with the guide groove 6, can laterally limit the lifting and lowering of the purification tank 4, preventing the purification tank 4 from shaking due to excessive lifting speed or uneven force. The guide groove 6 extends along the height direction of the purification tank 4, providing stable guidance for the lifting and lowering movement of the purification tank 4.

[0047] Alternatively, the connection between the clamping rod 8 and the bracket 7 can be a hinge structure, so that the clamping rod 8 has a certain rotational margin, allowing the angle of the clamping rod 8 to be flexibly adjusted when installing or removing the purification tank 4, which facilitates operation.

[0048] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0049] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A purification device for diamond micron powder production, characterized in that, include: The base (1) has a cavity inside; A slot (2) is formed at the bottom of the base (1) and connects to the cavity. A lifting platform (3) is fitted into the opening of the slot (2). A purification tank (4) is connected to a feed pipe (5). The bottom of the purification tank (4) is placed on the top of the lifting platform (3), and the bottom of the purification tank (4) and the top of the lifting platform (3) are connected by an external screw. An isolation layer (23) is formed inside the inner wall of the purification tank (4). An electromagnetic module (24) is provided inside the isolation layer (23). The electromagnetic module (24) includes an electromagnetic coil.

2. The impurity removal device for diamond micron powder production according to claim 1, characterized in that, The purification tank (4) is provided with a stirring chamber, a partition (20) and a drain chamber (21) arranged in sequence inside. The stirring chamber and the drain chamber (21) are separated by the partition (20). The stirring chamber is provided with a rotating shaft (18) inside. Several stirring rods (19) are provided on the shaft of the rotating shaft (18). The top of the partition (20) is provided with a mating interface (27) that is adapted to the end of the rotating shaft (18).

3. The impurity removal device for diamond micron powder production according to claim 2, characterized in that, The rotating shaft (18) is a hollow structure with several air holes (30) on its surface. The end of the rotating shaft (18) facing the interface (27) has an opening, and the end of the rotating shaft (18) with the opening extends to the drain chamber (21) through the interface (27).

4. The impurity removal device for diamond micron powder production according to claim 1, characterized in that, The cavity is provided with a drive frame (11), the bottom of the lifting platform (3) is fixedly connected to the top of the drive frame (11), and the bottom of the drive frame (11) is provided with a lifting mechanism (12).

5. The impurity removal device for diamond micron powder production according to claim 4, characterized in that, The top of the lifting platform (3) is provided with an air pipe (9), and the bottom of the purification tank (4) is provided with a docking hole (22). The docking hole (22) is connected to the draining chamber (21), and the air pipe (9) is connected to the docking hole (22). A limiting sleeve (10) is provided on the air pipe (9), and a protrusion is provided on the limiting sleeve (10). A limiting groove (29) adapted to the protrusion is provided on the inner wall of the docking hole (22).

6. The impurity removal device for diamond micron powder production according to any one of claims 4-5, characterized in that, Also includes: First conduit (13), the first conduit (13) is located inside the cavity, one end of the first conduit (13) passes through the inner wall of the base (1) and is connected to the gas tank; second conduit (14), the second conduit (14) is located inside the cavity, one end of the second conduit (14) passes through the inner wall of the base (1) and is connected to the waste liquid tank; third conduit (15), the third conduit (15) is located inside the cavity and is connected to the gas pipe (9); three-way valve (16), the three ports of the three-way valve (16) are respectively connected to the first conduit (13), the second conduit (14) and the third conduit (15); wherein, the first conduit (13) and the second conduit (14) are both equipped with vacuum pumps (17).

7. The impurity removal device for diamond micron powder production according to claim 2, characterized in that, The surface of the partition (20) is covered with a filter screen (25), and the filter holes on the filter screen (25) penetrate the partition (20). The partition (20) is arranged in a conical structure, and a collar (26) is fitted around the edge of the partition (20). An annular groove (28) adapted to the collar (26) is opened on the inner wall of the drainage chamber (21).

8. The impurity removal device for diamond micron powder production according to claim 1, characterized in that, The base (1) is also provided with a support (7) on top, and the support (7) is provided with clamps (8), and the two clamps (8) are distributed relative to each other with the purification tank (4) as the center.

9. The impurity removal device for diamond micron powder production according to claim 8, characterized in that, The surface of the purification tank (4) is provided with a guide groove (6), which extends along the height direction of the purification tank (4). The end of the clamping rod (8) away from the bracket (7) is engaged with the guide groove (6).

10. The impurity removal device for diamond micron powder production according to claim 1, characterized in that, The purification tank (4) is made of steel lined with polytetrafluoroethylene or PPH material, is completely sealed, and has a material outlet and a sealing cover adapted to the material outlet at the top.

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