Apparatus and method for purifying high-purity ammonium chloride from by-product ammonium chloride in potassium nitrate production

Abstract

This application relates to an equipment and method for purifying high-purity ammonium chloride, a byproduct of potassium nitrate production, within the field of experimental equipment technology. It includes a washing mechanism comprising a cylinder and a mounting base. The cylinder has an inlet and an outlet, and the mounting base is located on both sides of the cylinder. The cylinder is slidably connected to the mounting base along a first direction. A dehydration mechanism is also included, with its inlet connected to the inlet of the cylinder. Finally, a drying mechanism is described, with its inlet connected to the outlet of the dehydration mechanism. This application improves the washing reaction time.

Description

Technical Field

[0001] This application relates to the field of experimental equipment technology, and in particular to an equipment and method for purifying high-purity ammonium chloride, a byproduct of potassium nitrate production. Background Technology

[0002] Ammonium chloride is a commonly used inorganic chemical raw material widely used in industry and agriculture. In agriculture, it can be used directly as fertilizer or as a raw material for the production of compound fertilizers. Industrially, its applications are even more extensive. It serves as a raw material for the production of many chemical products; it can also be used as a degreasing agent and etching agent for metal surface treatment in electroplating, spraying, and welding; as a solvent for aluminum surface treatment; as a cleaning agent and detergent for glass and ceramics; and as a denitrification agent for chimney gases in industrial production such as thermal power plants and steel mills.

[0003] However, ammonium chloride is generally a byproduct of industrial production, such as chlor-alkali plants, soda ash plants, fertilizer plants, titanium dioxide plants, and potassium nitrate plants. In order to remove some impurities from ammonium chloride, it is necessary to wash the ammonium chloride with water, that is, to react ammonium chloride with water, and then further heat to extract ammonium chloride after the reaction, and then dehydrate and dry the ammonium chloride to obtain solid ammonium chloride.

[0004] Regarding the aforementioned technologies, since ammonium chloride needs to react fully with water, and the reaction between ammonium chloride and water requires a certain amount of time, the reaction time is long when extracting large quantities of ammonium chloride, which affects the preparation efficiency. Therefore, there is an urgent need to provide a purification equipment for high-purity ammonium chloride that can improve the water washing reaction time. Summary of the Invention

[0005] To improve the water washing reaction time, this application provides an equipment and method for purifying high-purity ammonium chloride, a byproduct of potassium nitrate production.

[0006] This application provides a device for purifying high-purity ammonium chloride, a byproduct of potassium nitrate production, using the following technical solution: A device for purifying high-purity ammonium chloride, a byproduct of potassium nitrate production, includes: A washing mechanism, comprising a cylinder and a mounting base, wherein the cylinder is provided with an inlet and an outlet, the mounting base is provided on both sides of the cylinder, and the cylinder is slidably connected to the mounting base along a first direction; A dehydration mechanism, wherein the feed end of the dehydration mechanism is connected to the feed port of the cylinder; The drying mechanism has its feed end connected to the discharge end of the dehydration mechanism.

[0007] When the prepared ammonium chloride reacts with water, a certain reaction time is required for the ammonium chloride to completely dissolve in the water. In order to improve the reaction rate of ammonium chloride with water, a cylinder that slides back and forth along the first direction is set up so that the cylinder can slide along the first direction, which further accelerates the reaction rate of ammonium chloride with water in the cylinder and makes the reaction of ammonium chloride with water more uniform. After the reaction is completed, the ammonium chloride enters the dehydration mechanism and the drying mechanism for dehydration and drying reactions.

[0008] Optionally, it may also include a drive mechanism for driving the cylinder to slide along the first direction.

[0009] By adopting the above technical solution and setting a driving mechanism, the cylinder can be driven to slide along the first direction.

[0010] Optionally, the drive mechanism includes A first rotating shaft is parallel to a second direction, the second direction is perpendicular to the first direction and parallel to the length direction of the cylinder. The first rotating shaft is rotatably connected to the mounting base. The first rotating shaft is parallel to the second direction along the rotation axis of the mounting base. The cylinder is coaxially sleeved on the first rotating shaft. The first rotating shaft is slidably connected to the mounting base along the first direction. A protrusion is located inside the cylinder and is fixedly connected to one side of the first rotating shaft, with a gap between the protrusion and the cylinder. A driving element connected to the first rotating shaft for driving the first rotating shaft to rotate in the second direction.

[0011] By adopting the above technical solution, by setting a first rotating shaft with a protrusion on one side, and the first rotating shaft rotating in the second direction, when the first rotating shaft rotates in the second direction, the first rotating shaft is driven to slide in the first direction due to the centrifugal force of the protrusion eccentrically set on the first rotating shaft. The first rotating shaft drives the cylinder to slide in the first direction, thereby realizing the swaying of the cylinder in the first direction.

[0012] Optionally, the driving mechanism further includes an elastic element, with an elastic element provided on both sides of the first rotating shaft. One end of the elastic element is fixedly connected to the mounting base, and the other end is directly or indirectly connected to the first rotating shaft. The extension and retraction direction of the elastic element is parallel to the first direction. By adopting the above technical solution, in order to ensure that the first rotating shaft slides back and forth in the first direction, elastic elements are provided on both sides of the first rotating shaft so that the first rotating shaft can always slide in the first direction under the action of the elastic elements, and the elastic elements also serve to connect the first rotating shaft and the mounting base.

[0013] Optionally, the driving mechanism further includes a guide block, the mounting base has a through groove along the first direction, the guide block is located in the through groove and slides along the groove wall, the guide block is sleeved on the first rotating shaft, one end of the elastic element is connected to the guide block, and the other end is connected to the groove wall.

[0014] By adopting the above technical solution, and by setting a guide block, the guide block slides in the through groove along the first direction, so that the guide block can guide the rotation of the first rotating shaft along the first direction.

[0015] Optionally, a bearing is connected between the cylinder and the first rotating shaft, the inner peripheral wall of the bearing is interference-fitted with the first rotating shaft, and the outer peripheral wall of the bearing is interference-fitted with the cylinder.

[0016] By adopting the above technical solution, since the cylinder is provided with a feed inlet and a discharge outlet, in order to ensure smooth feeding and discharging, it is necessary to ensure that the cylinder cannot rotate in the first direction. The cylinder is sleeved on the outer circumference of the first rotating shaft. In order to prevent the cylinder from rotating with the first rotating shaft, a bearing is provided between the first rotating shaft and the cylinder. Through the interference fit between the bearing and the first rotating shaft, and the interference fit between the bearing and the cylinder, the cylinder can slide in the first direction while not rotating in the second direction.

[0017] Optionally, the side of the protrusion away from the first rotating shaft is arc-shaped, and the arc-shaped opening faces the side closer to the first rotating shaft.

[0018] By adopting the above technical solution, after ammonium chloride enters the cylinder through the feed inlet, it is located in the gap between the cylinder and the first rotating shaft. The first rotating shaft drives the protrusion to rotate in the second direction, so that the protrusion contacts and crushes the blocky ammonium chloride, further accelerating the dissolution rate of ammonium chloride and increasing the reaction time of ammonium chloride with water, thereby improving the experimental efficiency.

[0019] Optionally, it also includes a water spray assembly, which includes a nozzle and a water distribution pipe. The nozzle is located inside the cylinder, and one end of the water distribution pipe passes through the top wall of the cylinder and is connected to the nozzle.

[0020] By adopting the above technical solution, and by setting up nozzles and water distribution pipes, water is sprayed into the cylinder by the nozzles to facilitate the reaction with ammonium chloride.

[0021] A method for purifying high-purity ammonium chloride, a byproduct of potassium nitrate production, is characterized by comprising the following steps: S1: Preparation of potassium nitrate and ammonium chloride: Add solid ammonium nitrate and potassium chloride to water and heat until dissolved, then cool with an ice-water bath; S2: Extraction of ammonium chloride: S21: Ammonium chloride hydrolysis: The ammonium chloride prepared after the reaction is passed into the cylinder, where it undergoes a hydrolysis reaction with water. S22: Ammonium chloride dehydration: The hydrolyzed ammonium chloride solution is passed into the dehydration mechanism for dehydration: S23: Dry ammonium chloride: The dehydrated ammonium chloride is passed into the drying mechanism for drying.

[0022] By adopting the above technical solution, ammonium chloride and potassium nitrate are produced by reacting ammonium nitrate and potassium chloride. In order to purify ammonium chloride, ammonium chloride is first passed into the cylinder of the water washing mechanism to react with water. After the reaction, it is passed into the dehydration mechanism and the drying mechanism for dehydration and drying.

[0023] In summary, this application includes at least one of the following beneficial technical effects: In this application, by setting the cylinder to slide back and forth along the first direction, the cylinder can be shaken, thereby accelerating the hydrolysis reaction of ammonium chloride and water in the cylinder and increasing the time for the reaction of ammonium chloride and water to be uniform, thus improving the preparation efficiency. This application utilizes the eccentric centrifugal force of the protrusion to drive the cylinder to slide along the first direction via the first rotating shaft, thereby enabling ammonium chloride and water inside the cylinder to react rapidly and improving reaction efficiency. This application incorporates protrusions that react with the blocky ammonium chloride during rotation to crush the ammonium chloride and increase its water solubility. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the overall structure of an equipment for purifying high-purity ammonium chloride, a byproduct of potassium nitrate production, according to this application. Figure 2 This is a cross-sectional view of the washing mechanism in this application; Figure 3 This is a schematic diagram of the drive mechanism of this application; Figure 4 This is a schematic diagram of the connection structure of the washing mechanism, dehydration mechanism and drying mechanism of this application.

[0025] Explanation of reference numerals in the attached drawings: 1. Washing mechanism; 11. Cylinder; 111. Inlet; 112. Outlet; 12. Mounting base; 121. Through groove; 2. Dewatering mechanism; 3. Drying mechanism; 4. Drive mechanism; 41. First rotating shaft; 411. Bearing; 42. Protrusion; 421. Gap; 43. Drive component; 44. Elastic component; 45. Guide block; 5. Water spray assembly; 51. Spray nozzle; 52. Water distribution pipe; 53. Main water pipe; 6. First pipe; 61. Valve; 7. Second pipe; 8. Third pipe. Detailed Implementation

[0026] The following is in conjunction with the appendix Figure 1-4 This application will be described in further detail. For ease of description, this application introduces directional terms such as first direction, second direction, and third direction to form a three-dimensional reference direction. The directional terms used, such as "first direction, second direction, and third direction", can be specifically referred to in the figure, where X represents the first direction X, Y represents the second direction Y, Z represents the third direction Z, and the first direction X, the second direction Y, and the third direction Z are perpendicular to each other.

[0027] This application discloses an embodiment of equipment for purifying high-purity ammonium chloride, a byproduct of potassium nitrate production. (Refer to...) Figure 1 The equipment for purifying high-purity ammonium chloride, a byproduct of potassium nitrate production, includes a washing mechanism 1, a dehydration mechanism 2, and a drying mechanism 3. The washing mechanism 1 includes a cylinder 11 and a mounting base 12. The cylinder 11 has an inlet 111 and an outlet 112. The mounting base 12 is located at both ends of the cylinder 11. The cylinder 11 is slidably connected to the mounting base 12 along a first direction. After the prepared ammonium chloride enters the cylinder 11 through the inlet 111, the cylinder 11 slides up and down along the first direction, further causing the ammonium chloride inside the cylinder 11 to shake, so that the ammonium chloride and water can react fully. The inlet end of the dehydration mechanism 2 is connected to the outlet 112 of the washing mechanism 1, and the inlet end of the drying mechanism 3 is connected to the outlet 112 of the dehydration mechanism 2, so that the ammonium chloride is dehydrated and dried by the dehydration mechanism 2 and the drying mechanism 3.

[0028] Reference Figure 1 In this embodiment, the feed inlet 111 is located at the top of the cylinder 11, the discharge outlet 112 is located at the bottom of the cylinder 11, and the cross-section of the cylinder 11 is circular.

[0029] Reference Figure 2 and Figure 3 To drive the cylinder 11 to rotate in the first direction, the equipment for purifying high-purity ammonium chloride, a byproduct of potassium nitrate production, also includes a drive mechanism 4. The drive mechanism 4 includes a first rotating shaft 41, a protrusion 42, and a drive component 43. The first rotating shaft 41 is parallel to a second direction, which is perpendicular to the first direction and parallel to the length direction of the cylinder 11. The cylinder 11 is coaxially sleeved on the second rotating shaft. The first rotating shaft 41 is rotatably connected to the mounting base 12. The first rotating shaft 41 is parallel to the second direction along the rotation axis of the mounting base 12, and the first... The rotating shaft 41 is slidably connected to the mounting base 12 along the first direction. The protrusion 42 is located inside the cylinder 11 and is fixedly connected to one side of the first rotating shaft 41, that is, the protrusion 42 is eccentrically connected to the side wall of the first rotating shaft 41. There is a gap 421 between the protrusion 42 and the cylinder 11. The driving component 43 is connected to the first rotating shaft 41. In this embodiment, the driving component 43 is a motor. The motor housing is fixedly connected to the mounting base 12, and the output shaft of the motor is coaxially fixedly connected to the first rotating shaft 41 to drive the first rotating shaft 41 to rotate along the second direction.

[0030] Reference Figure 2 Since the protrusion 42 is located on one side of the first rotating shaft 41, when the first rotating shaft 41 rotates in the second direction, the protrusion 42 will drive the first rotating shaft 41 to slide in the first direction under the action of centrifugal force, further realizing the swaying of the cylinder 11 in the first direction.

[0031] Reference Figure 3 To ensure that the first rotating shaft 41 can slide back and forth along the first direction, the drive assembly also includes an elastic element 44. Both ends of the first rotating shaft 41 are provided with elastic elements 44. One end of the elastic element 44 is connected to the mounting base 12, and the other end is directly or indirectly connected to the first rotating shaft 41. The extension and retraction direction of the elastic element 44 is parallel to the first direction. In this embodiment, of the two elastic elements 44 connected to the first rotating shaft 41, one elastic element 44 is a compression spring and the other elastic element 44 is a tension spring. For ease of description, the elastic element 44 located above the first rotating shaft 41 is defined as a compression spring, and the elastic element 44 located below the first rotating shaft 41 is defined as a tension spring. Reference Figure 2 and Figure 3 The state of the first rotating shaft 41 is different, and the state of the elastic element 44 is also different, as detailed below: When the first rotating shaft 41 is stationary, both elastic elements 44 are in their normal state; When the first rotating shaft 41 rotates in the second direction, and the protrusion 42 rotates above the first rotating shaft 41, the elastic element 44 located above the first rotating shaft 41 changes from the normal state to the compressed state, and the elastic element 44 located below the first rotating shaft 41 changes from the normal state to the stretched state.

[0032] Under the force of the elastic element 44, when the first rotating shaft 41 rotates in the second direction, the cylinder 11 can further slide back and forth in the first direction.

[0033] Reference Figure 3 In order to guide the sliding of the first rotating shaft 41 along the first direction, the drive mechanism 4 also includes a guide block 45. The mounting base 12 has a through groove 121 along the first direction. The guide block 45 is located in the through groove 121 and slides in the first direction within the groove wall of the through groove 121. One end of the elastic member 44 is fixedly connected to the guide block 45, and the other end is fixedly connected to the groove wall of the through groove 121, so that the guide block 45 guides the sliding of the first rotating shaft 41 along the first direction.

[0034] Reference Figure 2Since the top of the cylinder 11 is provided with a feed inlet 111, in order not to affect the smooth feeding of the cylinder 11, a bearing 411 is provided between the cylinder 11 and the first rotating shaft 41. The bearing 411 is coaxially sleeved on the first rotating shaft 41. The inner peripheral wall of the bearing 411 is interference-fitted with the first rotating shaft 41, and the outer peripheral wall of the bearing 411 is interference-fitted with the cylinder 11, so that when the first rotating shaft 41 rotates in the second direction, the cylinder 11 is stationary in the second direction, that is, the cylinder 11 itself does not rotate, thus not affecting the feeding and discharging of ammonium chloride.

[0035] Reference Figure 2 After ammonium chloride enters the cylinder 11 through the feed inlet 111, it is located in the gap 421 between the cylinder 11 and the first rotating shaft 41. In order to further improve the hydrolysis rate of ammonium chloride, the side of the protrusion 42 away from the first rotating shaft 41 is arc-shaped, and the arc-shaped opening faces the side close to the first rotating shaft 41. When the first rotating shaft 41 drives the protrusion 42 to rotate in the second direction, the protrusion 42 will come into further contact with the ammonium chloride, thereby crushing the blocky ammonium chloride by the protrusion 42, further accelerating the dissolution rate of ammonium chloride.

[0036] Reference Figure 2 To facilitate the reaction of ammonium chloride with water, the equipment for purifying high-purity ammonium chloride, a byproduct of potassium nitrate production, also includes a water spray assembly 5. The water spray assembly 5 includes a nozzle 51, a water distribution pipe 52, and a main water pipe 53. Multiple nozzles 51 are also provided inside the cylinder 11, and the multiple nozzles 51 are spaced apart along the length of the cylinder 11. In order to spray water into the cylinder 11 from the nozzles 51, one end of each nozzle 51 is connected to a water distribution pipe 52. The water distribution pipe 52 passes through the side wall of the cylinder 11 and is located outside the cylinder 11. The main water pipe 53 is parallel to the length of the cylinder 11. The end of the water distribution pipe 52 away from the nozzle 51 is fixedly connected to the main water pipe 53. The main water pipe 53 is connected to an external water source through a water pipe so that water can be sprayed into the cylinder 11 from the nozzles 51 to wash the ammonium chloride.

[0037] Reference Figure 4 After ammonium chloride reacts with water inside cylinder 11, impurities (such as sodium chloride) in the ammonium chloride need to be extracted and removed by heating reaction (this step is not shown in the figure). After the impurities are removed, the ammonium chloride enters the dehydration mechanism 2 for dehydration. In this embodiment, the dehydration mechanism 2 is a centrifugal dehydrator. By using the centrifugal method of rotating the inner cylinder, the water and substances are separated by the centrifugal force generated by the high rotation. The dehydration mechanism 2 is the prior art in this industry, and the internal structure of the dehydration mechanism 2 will not be described in detail in this application.

[0038] Reference Figure 4After dehydration, the sodium chloride enters the drying unit 3 for drying. The drying unit 3 is a common dryer in the art. It evaporates the moisture in the material by means of hot air and mechanical operation, thereby achieving a rapid drying effect. The dryer is the prior art in the art. The internal structure of the drying unit 3 will not be described in detail in this application.

[0039] Reference Figure 4 To connect the cylinder 11, dehydration mechanism 2, and drying mechanism 3, the equipment for purifying high-purity ammonium chloride, a byproduct of potassium nitrate production, also includes a first pipe 6, a second pipe 7, and a third pipe 8. The inlet end of the first pipe 6 is connected to the outlet 112 of the cylinder 11, the inlet end of the second pipe 7 is connected to the outlet end of the first pipe 6, the outlet end of the second pipe 7 is connected to the inlet end of the dehydration mechanism 2, and the inlet end of the third pipe 8 is connected to the inlet end of the drying mechanism 3. To ensure that the ammonium chloride enters the dehydration mechanism 2 after the reaction in the cylinder 11 is completed, a valve 61 is connected to the first pipe 6. Before the reaction of ammonium chloride in the cylinder 11 is completed, the valve 61 is closed. After the reaction is completed, the valve 61 is opened, and the ammonium chloride enters the dehydration mechanism 2 for the next reaction.

[0040] Reference Figure 4 In this embodiment, since the cylinder 11 slides back and forth along the first direction, the first pipe 6 is a flexible pipe to adapt to the sliding of the cylinder 11.

[0041] The implementation principle of the equipment for purifying high-purity ammonium chloride, a byproduct of potassium nitrate production, in this embodiment is as follows: The ammonium chloride generated by the reaction is introduced into the cylinder 11 through the feed port 111, and water is introduced into the cylinder 11 through the nozzle 51. The drive component 43 is activated, and the drive component 43 drives the first rotating shaft 41 to rotate in the second direction. Under the action of the bearing 411, the cylinder 11 does not rotate, and the first rotating shaft 41 drives the protrusion 42 to rotate. Under the action of the eccentric centrifugal force of the protrusion 42 and the action of the elastic component 44, the cylinder 11 is driven to slide back and forth in the first direction, thereby realizing the shaking of the cylinder 11 in the first direction to accelerate the reaction rate of water and ammonium chloride in the cylinder 11. In addition, since the ammonium chloride is located in the gap 421 between the cylinder 11 and the first rotating shaft 41, the protrusion 42 will come into contact with the blocky ammonium chloride during the rotation process, so that the arc-shaped protrusion 42 crushes the ammonium chloride, further accelerating the water solubility rate of ammonium chloride. After washing, the ammonium chloride is further dehydrated in dehydration unit 2, and finally dried in drying equipment to prepare solid ammonium chloride with high purity.

[0042] This embodiment also discloses a method for purifying high-purity ammonium chloride, a byproduct of potassium nitrate production, comprising the following steps: S1: Preparation of potassium nitrate and ammonium chloride: Add solid ammonium nitrate and potassium chloride to water and heat until dissolved, then cool with an ice-water bath; S2: Extraction of ammonium chloride: S21: Ammonium chloride hydrolysis: The ammonium chloride prepared after the reaction is introduced into the cylinder 11. The ammonium chloride undergoes a hydrolysis reaction with water. The driving component 43 drives the cylinder 11 to slide back and forth in the first direction through the first rotating shaft 41 and the protrusion 42, so that the ammonium chloride and water are quickly and thoroughly mixed. After hydrolysis, the impurities of the ammonium chloride are extracted and removed by heating to obtain a high-purity ammonium chloride solution. S22: Ammonium chloride dehydration: The hydrolyzed ammonium chloride solution is passed into dehydration unit 2 for dehydration: S23: Dry ammonium chloride: The dehydrated ammonium chloride is passed into the drying unit 3 for drying.

[0043] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A device for purifying high-purity ammonium chloride, a byproduct of potassium nitrate production, characterized in that: include A washing mechanism (1) includes a cylinder (11) and a mounting base (12). The cylinder (11) is provided with an inlet (111) and an outlet (112). The mounting base (12) is located on both sides of the cylinder (11). The cylinder (11) is slidably connected to the mounting base (12) along a first direction. Dehydration mechanism (2), the feed end of the dehydration mechanism (2) is connected to the feed port (111) of the cylinder (11); The drying mechanism (3) has its feed end connected to the discharge end of the dehydration mechanism (2).

2. The equipment for purifying high-purity ammonium chloride, a byproduct of potassium nitrate production, according to claim 1, is characterized in that: It also includes a drive mechanism (4) for driving the cylinder (11) to slide in a first direction.

3. The equipment for purifying high-purity ammonium chloride, a byproduct of potassium nitrate production, according to claim 2, is characterized in that: The drive mechanism (4) includes A first rotating shaft (41) is parallel to a second direction, which is perpendicular to the first direction and parallel to the length direction of the cylinder (11). The first rotating shaft (41) is rotatably connected to the mounting base (12). The first rotating shaft (41) is parallel to the second direction along the rotation axis of the mounting base (12). The cylinder (11) is coaxially sleeved on the first rotating shaft (41). The first rotating shaft (41) is slidably connected to the mounting base (12) along the first direction. A protrusion (42) is located inside the cylinder (11). The protrusion (42) is fixedly connected to one side of the first rotating shaft (41). There is a gap (421) between the protrusion (42) and the cylinder (11). A drive member (43) is connected to the first rotating shaft (41) for driving the first rotating shaft (41) to rotate in the second direction.

4. The equipment for purifying high-purity ammonium chloride, a byproduct of potassium nitrate production, according to claim 3, is characterized in that: The drive mechanism (4) further includes an elastic element (44). An elastic element (44) is provided on both sides of the first rotating shaft (41). One end of the elastic element (44) is fixedly connected to the mounting base (12), and the other end is directly or indirectly connected to the first rotating shaft (41). The extension and retraction direction of the elastic element (44) is parallel to the first direction.

5. The equipment for purifying high-purity ammonium chloride, a byproduct of potassium nitrate production, according to claim 4, is characterized in that: The drive mechanism (4) further includes a guide block (45). The mounting base (12) has a through groove (121) along the first direction. The guide block (45) is located in the through groove (121) and slides along the groove wall of the through groove (121). The guide block (45) is sleeved on the first rotating shaft (41). One end of the elastic member (44) is connected to the guide block (45), and the other end is connected to the groove wall of the through groove (121).

6. The equipment for purifying high-purity ammonium chloride, a byproduct of potassium nitrate production, according to claim 3, is characterized in that: A bearing (411) is connected between the cylinder (11) and the first rotating shaft (41). The inner peripheral wall of the bearing (411) is interference-fitted with the first rotating shaft (41), and the outer peripheral wall of the bearing (411) is interference-fitted with the cylinder (11).

7. The equipment for purifying high-purity ammonium chloride, a byproduct of potassium nitrate production, according to claim 3, is characterized in that: The protrusion (42) is arc-shaped on the side away from the first rotating shaft (41), and the arc-shaped opening faces the side closer to the first rotating shaft (41).

8. The equipment for purifying high-purity ammonium chloride, a byproduct of potassium nitrate production, according to claim 1, is characterized in that: It also includes a water spray assembly (5), which includes a nozzle (51) and a water distribution pipe (52). The nozzle (51) is located inside the cylinder (11), and one end of the water distribution pipe (52) passes through the top wall of the cylinder (11) and is connected to the nozzle (51).

9. A method for purifying high-purity ammonium chloride, a byproduct of potassium nitrate production, using the equipment described in any one of claims 1-8, characterized in that: Includes the following steps: S1: Preparation of potassium nitrate and ammonium chloride: Add solid ammonium nitrate and potassium chloride to water and heat until dissolved, then cool with an ice-water bath; S2: Extraction of ammonium chloride: S21: Ammonium chloride hydrolysis: The ammonium chloride prepared after the reaction is passed into the cylinder (11), and the ammonium chloride undergoes a hydrolysis reaction with water; S22: Ammonium chloride dehydration: The hydrolyzed ammonium chloride solution is passed into the dehydration mechanism (2) for dehydration: S23: Dry ammonium chloride: The dehydrated ammonium chloride is passed into the drying mechanism (3) for drying.

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