Evaporation device for aluminum oxide

Abstract

The invention provides an evaporation device for aluminum oxide, and relates to the technical field of aluminum oxide production. The evaporation device comprises an evaporation box, a liquid inlet assembly, a pressure relief assembly, an evaporation assembly, a driving assembly and a filtering assembly. A liquid inlet is formed in the top of the evaporation box. One end of the liquid inlet assembly is communicated with the liquid inlet, and the other end is communicated with the mother liquid outlet. The pressure relief assembly is installed on the top of the evaporation box. And the evaporation assembly is mounted in the evaporation box. The driving assembly is installed outside the evaporation box and connected with the evaporation assembly. And the filtering assembly is mounted below the evaporation assembly. The evaporation assembly comprises a rotating rod and an evaporation plate. The rotating rod is rotationally installed in the evaporation box, and one end of the rotating rod extends out of the evaporation box and is connected with the driving assembly. A power supply assembly is arranged in the middle of the rotating rod. And the evaporation plate is mounted on the rotating rod. Mother liquor is evaporated through the evaporation plate arranged in a swinging mode, the evaporated mother liquor is filtered through the filtering assembly arranged on the lower portion, and the filtered mother liquor enters the evaporation box.

Description

Technical Field

[0001] The present invention relates to the technical field of alumina production, in particular to an evaporation device for alumina. Background Art

[0002] Alumina has the ability to selectively adsorb moisture in gases, water vapor and certain liquids. After adsorption saturation, it can be heated at about 175-315°C to remove moisture. Therefore, during the production process of alumina, it is necessary to evaporate the excess moisture in the alumina to remove the excess moisture in the alumina and thus ensure the purity of the alumina.

[0003] In alumina production, Bayer process seed liquor or sintering process carbon liquor must be evaporated and concentrated to remove excess salts, resulting in a qualified circulating liquor for use in the next cycle. The current evaporation process used in alumina production is multi-effect evaporation, which uses steam as a heat source to concentrate the evaporated stock liquor. Due to the lengthy evaporation process, parameter adjustments take a long time to reflect changes in the outlet liquor concentration. This blind manipulation of process parameters can lead to large fluctuations in the outlet liquor concentration, even substandard products, and significant steam consumption. Summary of the Invention

[0004] In order to solve the above technical problems, the present invention provides an evaporation device for aluminum oxide, in which the mother liquor is evaporated by a swinging evaporation plate, and the evaporated mother liquor is filtered by a filter assembly arranged below, and the filtered mother liquor enters the evaporation box.

[0005] The technical solution adopted in the present invention is: An evaporation device for aluminum oxide, comprising: an evaporation box, wherein a liquid inlet is provided on the top of the evaporation box; a liquid inlet assembly, one end of which is connected to the liquid inlet and the other end of which is connected to the mother liquid outlet; a pressure relief assembly, mounted on the top of the evaporation tank; an evaporation assembly, rotatably mounted in the evaporation box; A driving assembly is installed outside the evaporation box and connected to the evaporation assembly, and the driving assembly drives the evaporation assembly to perform reciprocating motion; A filter assembly is installed directly below the evaporation assembly; Wherein, the evaporation component includes: A rotating rod is rotatably mounted in the evaporation box, one end of which extends out of the evaporation box and is connected to the drive assembly, and a power supply assembly is provided in the middle of the rotating rod; The evaporation plate is mounted on the rotating rod, and the power supply assembly supplies power to the evaporation plate.

[0006] Optionally, the liquid inlet component includes: a liquid inlet pipe, the liquid inlet pipe being installed in the liquid inlet, one end of the liquid inlet pipe being located outside the evaporation box, and the other end extending into the evaporation box; a metering pump, mounted on the liquid inlet pipe; A liquid distribution plate is provided with a liquid buffer chamber therein, the liquid buffer chamber is communicated with the liquid inlet pipe, a liquid distribution hole is provided at the bottom of the liquid distribution plate and is communicated with the liquid buffer chamber, and the liquid distribution plate is located on the top of the evaporation plate.

[0007] Optionally, the pressure relief component includes: a pressure relief pipe, mounted on the top of the evaporation box, with one end of the pressure relief pipe extending into the evaporation box; a pressure relief valve, installed on the pressure relief pipe; The adsorbent is filled in the pressure relief pipe and is located on a side of the pressure relief valve away from the evaporation tank.

[0008] Optionally, the driving assembly includes: a driving tooth mounted on the rotating rod; A slide rail, mounted on the outer side wall of the evaporation box; a rack, slidably mounted on the slide rail, the rack meshing with the driving teeth; A driving member is installed on the outer side wall of the evaporator box, and a movable end of the driving member is connected to the rack to drive the rack to reciprocate.

[0009] Optionally, a plurality of guide grooves are provided on the top of the evaporation plate, and the depth of the middle portion of the guide grooves is greater than the depth of the two sides.

[0010] Optionally, the bottom of the guide groove is wavy.

[0011] Optionally, the evaporation device further comprises: A cleaning component is arranged on the top of the evaporation box.

[0012] Optionally, the cleaning component includes: a lifting mechanism, mounted on the top of the inner side wall of the evaporation box, with the movable end of the lifting mechanism disposed toward the evaporation plate; A mounting seat, mounted on the movable end of the lifting rod mechanism; The cleaning device is installed on a side of the mounting base facing the evaporation plate.

[0013] Optionally, the cleaning device includes: A rotating frame is mounted on the bottom of the mounting base; A rotating brush is mounted on the rotating frame; A driving motor is mounted on the mounting seat, and a driving end of the driving motor is connected to a rotating shaft on the rotating frame; A mounting frame, mounted on the bottom of the mounting seat, with a height lower than that of the rotating frame after installation; An adsorption tube is mounted on the mounting frame, and a dust suction port is provided on the adsorption tube; One end of the negative pressure tube is connected to the adsorption tube, and the other end of the negative pressure tube is connected to the recovery component.

[0014] Optionally, the filter assembly includes: The multi-layer filter plate is arranged obliquely, and a sedimentation plate is arranged at one end of the filter plate which is inclined downward. The filter holes of the filter plate gradually decrease from the end close to the evaporation plate to the end away from the evaporation plate.

[0015] Compared with the prior art, the present invention has the following beneficial effects: 1. The mother liquor is evaporated through the swinging evaporation plate. The evaporated mother liquor is filtered through the filter assembly arranged below. The filtered mother liquor enters the evaporation box.

[0016] 2. A guide groove is provided on the evaporation plate, and the depth of the middle part of the guide groove is greater than the depth of the two sides, so that the precipitated carbon alkali can be concentrated in the middle part of the guide groove. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0018] Figure 1 This is a schematic diagram of the overall structure of the evaporation device for aluminum oxide.

[0019] Figure 2 Schematic diagram of the coordination structure of the evaporation component and the drive component.

[0020] Figure 3 A schematic diagram of the cleaning component.

[0021] Figure 4 The present invention is a schematic structural diagram of an evaporation device for aluminum oxide having a circulation component.

[0022] Reference numerals: 1. Evaporator; 11. Liquid inlet; 2. Liquid inlet assembly; 21. Liquid inlet pipe; 22. Metering pump; 23. Liquid distribution plate; 24. Buffer chamber; 25. Liquid distribution hole; 3. Pressure relief assembly; 31. Pressure relief pipe; 32. Pressure relief valve; 33. Adsorbent; 4. Evaporation assembly; 41. Rotating rod; 42. Power supply assembly; 43. Evaporation plate; 44. Diversion trough; 45. Filter; 5. Driving assembly; 51. Driving gear; 52. Slide rail; 53. Rack; 54. Driving member; 6. Filter assembly; 61. Filter plate; 62. Sedimentation plate; 7. Cleaning assembly; 71. Lifting mechanism; 72. Mounting seat; 73. Cleaning device; 731. Rotating frame; 732. Rotating brush; 733. Driving motor; 734. Mounting frame; 735. Adsorption tube; 736. Negative pressure tube; 8. Circulation component; 81. Circulation pipeline; 82. Circulation pump. DETAILED DESCRIPTION

[0023] Hereinafter, only certain exemplary embodiments are briefly described. As will be appreciated by those skilled in the art, the described embodiments may be modified in various ways without departing from the spirit or scope of the present invention. Therefore, the drawings and description are to be considered as illustrative in nature and not restrictive.

[0024] In the description of the present invention, it should be understood that the terms "upper", "lower", "left", "right", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, or are the orientation or position relationship in which the product of the present invention is conventionally placed when in use, or are the orientation or position relationship conventionally understood by those skilled in the art. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limiting the present invention.

[0025] In the present invention, unless otherwise expressly specified or limited, terms such as "mounted," "connected," "connect," and "fixed" should be understood broadly. For example, they may refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection, or communication; direct connection or indirect connection through an intermediate medium; and internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0026] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Furthermore, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0027] The disclosure below provides many different embodiments or examples for realizing different structures of the present invention. In order to simplify the disclosure of the present invention, the components and settings of specific examples are described below. Of course, they are merely examples and are not intended to limit the present invention. In addition, the present invention may repeat reference numbers and / or reference letters in different examples. Such repetition is for the purpose of simplicity and clarity and does not in itself indicate the relationship between the various embodiments and / or settings discussed. In addition, the present invention provides examples of various specific processes and materials, but those skilled in the art will recognize the application of other processes and / or the use of other materials.

[0028] The embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0029] like Figure 1 As shown, an embodiment of the present invention provides an evaporation device for aluminum oxide, comprising: an evaporation box 1, a liquid inlet assembly 2, a pressure relief assembly 3, an evaporation assembly 4, a drive assembly 5, and a filter assembly 6. A liquid inlet 11 is provided on the top of the evaporation box 1. One end of the liquid inlet assembly 2 is connected to the liquid inlet 11, and the other end is connected to the mother liquid outlet. The pressure relief assembly 3 is installed on the top of the evaporation box 1. The evaporation assembly 4 is rotatably installed in the evaporation box 1. The drive assembly 5 is installed outside the evaporation box 1 and is connected to the evaporation assembly 4. The drive assembly 5 drives the evaporation assembly 4 to reciprocate. The filter assembly 6 is installed directly below the evaporation assembly 4.

[0030] During use, the mother liquor is fed into the evaporation tank 1 through the liquid inlet assembly 2. It is then slowly fed through the liquid inlet assembly 2 to the evaporation assembly 4, where it evaporates. The remaining mother liquor falls below for filtration. After being filtered by the filtration assembly 6, the mother liquor enters the bottom of the evaporation tank 1.

[0031] During the evaporation process, the driving assembly 5 drives the evaporation assembly 4 mounted in the evaporation box 1 to swing. During the swinging process, the mother liquid comes into contact with the evaporation assembly 4 more fully, thereby evaporating the mother liquid more completely. During the evaporation process, the mother liquid forms a layer of carbon alkali on the evaporation assembly 4, which can be removed regularly in subsequent processing.

[0032] Unevaporated breast milk flows through the evaporation assembly 4 into the filter assembly 6, and then falls into the evaporation box 1. The filter assembly 6 is provided to facilitate filtering out the carbon and alkali that enter the filter assembly 6 along with the mother liquid. The steam generated during the evaporation process is discharged through the pressure relief assembly 3.

[0033] More specifically, if Figure 1 and Figure 2 As shown, the evaporation assembly 4 includes a rotating rod 41 and an evaporation plate 43. The rotating rod 41 is rotatably mounted within the evaporation box 1. One end of the rotating rod 41 extends out of the evaporation box 1 and is connected to the drive assembly 5. A power supply assembly 42 is disposed in the middle of the rotating rod 41. The evaporation plate 43 is mounted on the rotating rod 41.

[0034] During use, the driving assembly 5 drives the rotating rod 41 to rotate, and the rotating rod 41 drives the evaporation plate 43 to swing during the rotation process. During the swinging process of the evaporation plate 43, the mother liquid contacts the evaporation plate 43 more evenly, and then a layer of carbon alkali is precipitated.

[0035] In one embodiment, Figure 1 As shown, the liquid inlet assembly 2 includes a liquid inlet pipe 21, a metering pump 22, and a liquid distribution plate 23. The liquid inlet pipe 21 is installed within the liquid inlet port 11, with one end located outside the evaporator 1 and the other end extending into the evaporator 1. The metering pump 22 is mounted on the liquid inlet pipe 21. The liquid distribution plate 23 includes a liquid buffer chamber 24, which is connected to the liquid inlet pipe 21. The bottom of the liquid distribution plate 23 is provided with a liquid distribution hole 25 that communicates with the liquid buffer chamber 24. When installed, the liquid distribution plate 23 is positioned directly above the evaporator plate 43.

[0036] When feeding mother liquid into the evaporation tank 1, the metering pump 22 provided on the liquid inlet pipe 21 controls the metering of the mother liquid entering the evaporation tank 1. The mother liquid enters the liquid distribution plate 23 and is then evenly transported by the liquid distribution plate 23 to the evaporation plate 43, where it is then evaporated.

[0037] In one embodiment, Figure 1 As shown, the pressure relief assembly 3 includes a pressure relief pipe 31, a pressure relief valve 32, and an adsorbent 33. The pressure relief pipe 31 is mounted on the top of the evaporator box 1, with one end of the pressure relief pipe 31 extending into the evaporator box 1. The pressure relief valve 32 is mounted on the pressure relief pipe 31. The adsorbent 33 is filled in the pressure relief pipe 31 and, after installation, is located on the side of the pressure relief valve 32 away from the evaporator box 1.

[0038] In order to avoid the pressure in the evaporation box 1 being too large, a pressure relief assembly 3 is arranged, and the steam in the evaporation box 1 is discharged through a pressure relief pipe 31. In the discharging process, the pressure in the evaporation box 1 is adjusted by a pressure relief valve 32 arranged on the pressure relief pipe 31. Since the discharged steam can make the humidity in the factory area too large, an adsorbent 33 is arranged in the pressure relief pipe 31, and the humidity in the steam is reduced by the adsorbent 33.

[0039] In one embodiment, as shown in Figure 1 and Figure 2 The driving assembly 5 comprises a driving tooth 51, a sliding rail 52, a rack 53 and a driving member 54. The driving tooth 51 is arranged on the rotating rod 41. The sliding rail 52 is arranged on the outer side wall of the evaporation box 1. The rack 53 is slidingly arranged on the sliding rail 52 and is engaged with the driving tooth 51. The driving member 54 is arranged on the outer side wall of the evaporation box 1, and the movable end of the driving member 54 is connected with the rack 53 for driving the rack 53 to reciprocate on the sliding rail 52.

[0040] In use, in order to facilitate the rotation of the evaporation plate 43, the driving member 54 is extended and retracted to drive the rack 53 to move on the sliding rail 52, and the rack 53 is engaged with the driving tooth 51 in the sliding process.

[0041] The driving member 54 in this embodiment is a pneumatic cylinder, a hydraulic cylinder, an electric telescopic rod or other mechanism capable of realizing linear reciprocating motion.

[0042] In one embodiment, as shown in Figure 1 and Figure 2 In order to increase the contact area between the evaporation plate 43 and the mother liquor, a plurality of flow guide grooves 44 are arranged on the top of the evaporation plate 43, and the depth of the middle part of the flow guide groove 44 is greater than that of the two sides.

[0043] In order to increase the contact area between the evaporation plate 43 and the mother liquor, a plurality of flow guide grooves 44 are arranged on the top of the evaporation plate 43, and the depth of the middle part of the flow guide groove 44 is greater than that of the two sides.

[0044] In one embodiment, in order to further increase the contact area between the evaporation plate 43 and the mother liquor, the groove bottom of the flow guide groove 44 is in a wave shape.

[0045] In one embodiment, as shown in Figure 2 A filter screen 45 is arranged on both sides of the evaporation plate 43 along the length direction, and the mother liquor is filtered by the filter plate 61 in the swinging process. The carbon alkali precipitated on the top of the evaporation plate 43 is prevented from being washed out of the flow guide groove 44 in the swinging process. The filter screen 45 can block the large pieces of carbon alkali precipitated on the evaporation plate 43 in the swinging process, and prevent the large pieces of carbon alkali from entering the mother liquor below.

[0046] In one embodiment, as shown in Figure 1 and Figure 2 As shown, the evaporation device further includes: a cleaning component 7, which is arranged on the top of the evaporation box 1.

[0047] More specifically, the cleaning assembly 7 includes a lifting mechanism 71, a mounting base 72, and a cleaning device 73. The lifting mechanism 71 is mounted on the top of the inner sidewall of the evaporator box 1, with the movable end of the lifting mechanism 71 facing the evaporator. The mounting base 72 is mounted on the movable end of the lifting mechanism 71. The cleaning device 73 is mounted on the side of the mounting base 72 facing the evaporator.

[0048] During use, the evaporation plate 43 needs to be cleaned regularly to remove precipitated carbon and alkali. Therefore, a cleaning assembly 7 is provided. During the cleaning process, the lifting mechanism 71 drives the mounting base 72 close to the evaporation plate 43, and then the cleaning device 73 provided on the mounting base 72 cleans the carbon and alkali on the evaporation plate 43.

[0049] In one embodiment, Figure 2 As shown, the cleaning device 73 includes a rotating frame 731, a rotating brush 732, a drive motor 733, a mounting frame 734, a suction pipe 735, and a negative pressure pipe 736. The rotating frame 731 is mounted on the bottom of the mounting base 72. The rotating brush 732 is mounted on the rotating frame 731. The drive motor 733 is mounted on the mounting base 72, and its driving end is connected to the rotating shaft of the rotating frame 731. The rotation of the drive motor 733 drives the rotating brush 732, which removes carbon alkali from the top of the evaporation plate 43 during this movement. The mounting frame 734 is mounted on the bottom of the mounting base 72, and its height is lower than that of the rotating frame 731. The suction pipe 735 is mounted on the mounting frame 734 and is provided with a dust suction port. One end of the suction pipe 735 is connected to the suction pipe 735, and the other end of the negative pressure pipe 736 is connected to the recovery assembly.

[0050] The cleaned carbon alkali is precipitated through the adsorption tube 735 installed on the mounting frame 734 and is sent to the external recovery component through the negative pressure tube 736 connected to the adsorption tube 735.

[0051] In one embodiment, Figure 1 As shown, the filter assembly 6 includes: a multi-layer filter plate 61, which is arranged at an angle. A sedimentation plate 62 is provided at one end of the filter plate 61 that is inclined downward. The filter holes of the filter plate 61 gradually decrease from the end close to the evaporation plate 43 to the end away from the evaporation plate 43.

[0052] After the mother liquor evaporates through evaporation plate 43, some of the mother liquor remains unevaporated and falls into filter assembly 6 below, where it is then filtered. Simultaneously, the carbon alkali precipitated by the oscillation of evaporation plate 43, along with some of the breast milk, enters filter assembly 6 and is then filtered. The filtered carbon alkali and impurities flow along the inclined filter plate 61 to one end of the sedimentation plate 62 for subsequent processing.

[0053] In one embodiment, Figure 4 As shown, to ensure the quality of the mother liquor discharged, a circulation assembly 8 is installed within the evaporation tank 1. This circulation assembly 8 includes a circulation pump 82 and a circulation pipe 81. One end of the circulation pipe 81 is connected to the discharge pipe of the evaporation tank 1, and the other end is connected to the liquid inlet pipe 21. The circulation pump 82 is mounted on the discharge pipe.

[0054] When the mother liquid is circulated, the circulation pump 82 works, the mother liquid enters the circulation pipe 81 , and is then transported to the liquid inlet pipe 21 .

[0055] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art will be able to modify the technical solutions described in the aforementioned embodiments or substitute equivalents for some of the technical features. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. An evaporation device for aluminum oxide, characterized in that: include: an evaporation box, wherein a liquid inlet is provided on the top of the evaporation box; a liquid inlet assembly, one end of which is connected to the liquid inlet and the other end of which is connected to the mother liquid outlet; a pressure relief assembly, mounted on the top of the evaporation tank; an evaporation assembly, rotatably mounted in the evaporation box; A driving assembly is installed outside the evaporation box and connected to the evaporation assembly, and the driving assembly drives the evaporation assembly to perform reciprocating motion; A filter assembly is installed directly below the evaporation assembly; Wherein, the evaporation component includes: A rotating rod is rotatably mounted in the evaporation box, one end of which extends out of the evaporation box and is connected to the drive assembly, and a power supply assembly is provided in the middle of the rotating rod; The evaporation plate is mounted on the rotating rod, and the power supply assembly supplies power to the evaporation plate.

2. The aluminum oxide evaporation device according to claim 1, wherein: The liquid inlet assembly comprises: a liquid inlet pipe, the liquid inlet pipe being installed in the liquid inlet, one end of the liquid inlet pipe being located outside the evaporation box, and the other end extending into the evaporation box; a metering pump, mounted on the liquid inlet pipe; A liquid distribution plate is provided with a liquid buffer chamber therein, the liquid buffer chamber is communicated with the liquid inlet pipe, a liquid distribution hole is provided at the bottom of the liquid distribution plate and is communicated with the liquid buffer chamber, and the liquid distribution plate is located on the top of the evaporation plate.

3. The evaporation device for aluminum oxide according to claim 1, characterized in that The pressure relief assembly comprises: a pressure relief pipe, mounted on the top of the evaporation box, with one end of the pressure relief pipe extending into the evaporation box; a pressure relief valve, installed on the pressure relief pipe; The adsorbent is filled in the pressure relief pipe and is located on a side of the pressure relief valve away from the evaporation tank.

4. The aluminum oxide evaporation device according to claim 1, wherein The drive assembly includes: a driving tooth mounted on the rotating rod; A slide rail, mounted on the outer side wall of the evaporation box; a rack, slidably mounted on the slide rail, the rack meshing with the driving teeth; A driving member is installed on the outer side wall of the evaporator box, and a movable end of the driving member is connected to the rack to drive the rack to reciprocate.

5. The evaporation device for aluminum oxide according to claim 1, characterized in that A plurality of guide grooves are provided on the top of the evaporation plate, and the depth of the middle portion of the guide grooves is greater than the depth of the two sides.

6. The aluminum oxide evaporation device according to claim 5, characterized in that: The bottom of the guide groove is wave-shaped.

7. The aluminum oxide evaporation device according to claim 1, wherein The evaporation device further comprises: A cleaning component is arranged on the top of the evaporation box.

8. The aluminum oxide evaporation device according to claim 7, characterized in that: The cleaning component includes: a lifting mechanism, mounted on the top of the inner side wall of the evaporation box, with the movable end of the lifting mechanism disposed toward the evaporation plate; A mounting seat, mounted on the movable end of the lifting rod mechanism; The cleaning device is installed on a side of the mounting base facing the evaporation plate.

9. The aluminum oxide evaporation device according to claim 8, characterized in that: The cleaning device comprises: A rotating frame is mounted on the bottom of the mounting base; A rotating brush is mounted on the rotating frame; A driving motor is mounted on the mounting seat, and a driving end of the driving motor is connected to a rotating shaft on the rotating frame; A mounting frame, mounted on the bottom of the mounting seat, with a height lower than that of the rotating frame after installation; An adsorption tube is mounted on the mounting frame, and a dust suction port is provided on the adsorption tube; One end of the negative pressure tube is connected to the adsorption tube, and the other end of the negative pressure tube is connected to the recovery component.

10. The aluminum oxide evaporation device according to claim 1, wherein: The filter assembly comprises: The multi-layer filter plate is arranged obliquely, and a sedimentation plate is arranged at one end of the filter plate which is inclined downward. The filter holes of the filter plate gradually decrease from the end close to the evaporation plate to the end away from the evaporation plate.

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