A self-cleaning ammonium perchlorate crystallization kettle and its use method

Abstract

The invention discloses a self-cleaning ammonium perchlorate crystallization kettle and a use method thereof, and specifically relates to the field of crystallization kettles. The kettle comprises a kettle body and a kettle cover, wherein the kettle body comprises a container for containing a solution and a crystallization component for enabling the solution to precipitate crystals, a driving shaft axially arranged in the kettle body, the driving shaft sequentially passing through the container and the crystallization component, the driving shaft rotating to stir the solution, the driving shaft moving up and down to spread or collect the solution on the crystallization component, a container for remixing the ammonium perchlorate solution is arranged in the kettle body, the solution is remixed before crystallization, and the solution mixing effect is improved, and multiple crystallization components are arranged below the container, the crystallization components can realize the study of the influence of cooling liquids of different temperatures on the crystallization results, the influence of stirring rate on the crystallization results, and the influence of the initial concentration of the crystallization liquid on the product particle size, and the three crystallization processes can respectively precipitate crystal products with different main particle sizes.

Description

Technical Field

[0001] The present invention relates to the technical field of crystallization kettles, and more specifically, to a self-cleaning ammonium perchlorate crystallization kettle and a use method thereof. Background Art

[0002] The crystallization process of ammonium perchlorate mainly includes cooling crystallization, supercritical crystallization and distillation crystallization. The cooling crystallization process is to reduce the temperature of the ammonium perchlorate solution to make it reach a saturated state, thereby inducing the nucleation, growth and precipitation of ammonium perchlorate crystals.

[0003] According to the prior art cooling crystallization method, the temperature of the ammonium perchlorate solution is lowered to the saturation point to promote the nucleation, growth and final precipitation of crystals. In the currently used cooling crystallization equipment, the circulation of the feed liquid mainly depends on its own temperature difference, and circulates between the inner cylinder and the crystallization area to achieve multiple cooling crystallization. There is a problem with this circulation method: the feed liquids at different temperature levels are unevenly distributed during the flow process, and are easily mixed with each other, which destroys the temperature gradient stability during the cooling process of the ammonium perchlorate solution. Summary of the invention

[0004] In order to overcome the above-mentioned defects of the prior art, an embodiment of the present invention provides a self-cleaning ammonium perchlorate crystallization kettle, by arranging a container capable of remixing the ammonium perchlorate solution in the kettle body, and remixing the solution before crystallization, so as to improve the solution mixing effect, and at the same time, a plurality of crystallization parts are arranged under the container, and the crystallization parts can be used to study the effects of the initial concentration of the crystallization solution, the stirring rate, the cooling rate, and the crystal growing time on the product particle size. The three crystallization processes can respectively precipitate crystal products with different main particle sizes to solve the problems raised in the above-mentioned background technology.

[0005] To achieve the above object, the present invention provides the following technical solution: a self-cleaning ammonium perchlorate crystallization kettle, comprising a kettle body and a kettle cover, wherein the kettle body has a container for containing a solution and a crystallization part for allowing the solution to precipitate crystals;

[0006] A driving shaft is axially arranged in the kettle body, and the driving shaft passes through the containing part and the crystallizing part in sequence;

[0007] The driving shaft rotates to stir the solution, and the driving shaft moves up and down to spread or collect the solution on the crystallization piece;

[0008] The device also comprises a cleaning part which rotates with the driving shaft and can clean the containing part and the crystallizing part.

[0009] In a preferred embodiment, three crystallization pieces are provided, namely, crystallization piece 1, crystallization piece 2, and crystallization piece 3, which are coaxially arranged below the container in sequence, and the edges of the container and the crystallization piece are connected to the kettle body;

[0010] The driving shaft extends downward through the kettle cover and passes through the containing part and the first crystallization part, the second crystallization part and the third crystallization part in sequence.

[0011] In a preferred embodiment, the container and the crystallization member are both arranged in a conical shape, wherein the apex of the container and the second crystallization member is arranged downward, and the apex of the crystallization member 1 and the third crystallization member is arranged upward;

[0012] A cleaning rod 1 and a cleaning rod 2 are arranged on the driving shaft.

[0013] In a preferred embodiment, a sleeve 1 is provided on the driving shaft, the sleeve 1 movably passes through the top of the container, and a stirring blade is provided on the sleeve 1;

[0014] A liquid outlet is provided on the circumferential surface of the sleeve one in the axial direction, and the length of the liquid outlet is smaller than the length of the sleeve one.

[0015] In a preferred embodiment, the second top surface of the crystallization member is provided with a bevel gear ring, the top surface of the bevel gear ring is provided with a toothed structure, the bottom of the circumferential surface of the bevel gear ring is hollowed out, a limiting cylinder is provided at a corresponding position of the driving shaft, and an outer barrel cover is provided on the driving shaft at the top of the limiting cylinder, and the bottom of the outer barrel cover is open and can be covered outside the bevel gear ring;

[0016] A second auger is provided on the periphery of the outer barrel cover. The shaft of the second auger can be rotatably passed through the outer barrel cover and extended into the limiting cylinder. At the same time, a gear is provided at the shaft of the second auger. The gear can engage with the toothed structure on the top surface of the helical gear ring. The second auger is inclined and parallel to the inclined surface of the second crystallization component.

[0017] In a preferred embodiment, a collecting box is installed on the circumferential surface of the outer barrel cover, the shaft of the second auger passes through one end of the collecting box, and a scraper is also provided at the other end of the collecting box;

[0018] The width of one side of the collection box is smaller than the width of the other side;

[0019] A cleaning pipe is arranged on the driving shaft above the second crystallization member.

[0020] In a preferred embodiment, an annular cooling channel is provided inside the crystallization member, and a cooling water pipe is connected at the bottom edge of the crystallization member. Cooling water enters and exits the cooling channel through the cooling water pipe, and the cooling water pipe extends through the kettle body to the outside.

[0021] In a preferred embodiment, the edges of the crystallization member 1, the crystallization member 2, and the crystallization member 3 are all provided with leakage ports, the edges of the crystallization members are all arranged horizontally, and at the same time, the edges of the crystallization member 1 and the crystallization member 3 are arranged with hollow structures that can filter crystals;

[0022] A discharge pipe is installed at the bottom leakage port of the crystallization unit 1, the crystallization unit 2 and the crystallization unit 3, and one end of the discharge pipe connected to the leakage port of the crystallization unit is connected to each other;

[0023] An auger driven by a motor is also installed in the discharge pipe. A crystal discharge port is arranged at the bottom of one end of the discharge pipe. The discharge pipe is arranged inclined, and a hollow structure is arranged at the bottom of one end of the discharge pipe.

[0024] In a preferred embodiment, a movable shaft is movably arranged at the axis center of the kettle cover, an edge protruding outward is arranged at the top of the movable shaft, and a plane bearing is arranged below the edge, and a lifting unit is installed between the plane bearing and the kettle cover;

[0025] A base frame is arranged above the kettle cover, a connecting rod is connected between the base frame and the kettle cover, and a motor is installed on the top of the base frame. The motor output shaft extends downward through the base frame, and a limit key is arranged on the output shaft. The motor output shaft is movably inserted into the axis center of the movable shaft.

[0026] In a preferred embodiment, a pipeline is provided through the bottom of the kettle body, and one end of the pipeline is connected to the bottom of the driving shaft;

[0027] The driving shaft is hollow and connected at the connection points of the stirring blade and the cleaning rod. One end of the pipeline is movably connected to the bottom of the driving shaft. The sides of the stirring blade and the cleaning rod are inclined with a nozzle structure.

[0028] A method for using a self-cleaning ammonium perchlorate crystallization kettle, applied to the above-mentioned ammonium perchlorate crystallization kettle, comprises the following steps;

[0029] Step 1: The original ammonium perchlorate solution is put into the container of the kettle body, and the stirring blade driven by the driving shaft mixes the solution again;

[0030] Step 2: The driving shaft moves downward, and the outer barrel cover of the synchronous crystallization unit 2 will be covered on the outside of the helical gear ring. The solution will first be discharged from the liquid outlet and spread on the crystallization unit 1, and the first crystallization will be completed on the crystallization unit 1;

[0031] Step 3: The solution flows into the second crystallization component through the hollow edge of the first crystallization component and is collected again. The collecting box rotates with the driving shaft, and the precipitated crystals are collected in the collecting box and transported to the edge of the second crystallization component again with the second auger to complete the second crystallization;

[0032] Step 4: The driving shaft rises, the limiting cylinder withdraws from blocking the top of the second crystallization component, the outer barrel cover withdraws from the oblique gear ring cover, and the solution is discharged from the top of the second crystallization component;

[0033] Step 5: After the solution is discharged from the second crystallization part, it flows into the third crystallization part and crystallizes again along the surface of the third crystallization part.

[0034] Technical effects and advantages of the present invention:

[0035] 1. A container capable of remixing the ammonium perchlorate solution is arranged in the kettle body, and the solution is mixed again before crystallization to improve the solution mixing effect. At the same time, multiple crystallization parts are arranged under the container. The crystallization parts can realize the study of the influence of cooling liquids of different temperatures on the crystallization results, the influence of stirring rate on the crystallization results, and the influence of the initial concentration of the crystallization liquid on the product particle size. The three crystallization processes can respectively precipitate crystal products with different main particle sizes;

[0036] 2. The crystallization kettle can automatically deliver crystals of different main particle sizes in batches, and separate the solution from the crystals during the discharge process;

[0037] 3. The crystallization kettle can achieve better cleaning to avoid affecting the next crystallization. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 It is a schematic diagram of the overall structure of the crystallization kettle of the present invention.

[0039] Figure 2 It is a schematic diagram of the internal structure of the crystallization kettle of the present invention.

[0040] Figure 3 It is a schematic diagram of the internal structure of the crystallization kettle of the present invention.

[0041] Figure 4 It is a schematic diagram of assembling the containing part and the crystallization part of the present invention.

[0042] Figure 5 for Figure 4 Enlarged schematic diagram at point A in the middle.

[0043] Figure 6 It is a schematic diagram of the assembly structure of the containing part and the crystallization part of the present invention.

[0044] Figure 7 for Figure 6 Enlarged schematic diagram of point B in the middle.

[0045] Figure 8 It is a schematic diagram of the assembly structure of the containing part and the crystallization part of the present invention.

[0046] Fig. 9 for Figure 8 Enlarged schematic diagram at point C in the middle.

[0047] Fig.10 It is a schematic diagram of the overall structure of the collection box of the present invention.

[0048] Fig.11 This is a schematic diagram of the structure of the outer barrel cover provided with a helical gear ring according to the present invention.

[0049] The reference numerals are: 1, kettle body; 101, liquid discharge port; 2, discharge pipe; 201, auger 1; 3, cooling water pipe; 301, cooling channel; 4, motor; 401, base frame; 402, connecting rod; 403, movable shaft; 404, limit key; 405, plane bearing; 406, lifting unit; 5, kettle cover; 501, feeding port; 6, driving shaft; 601, container; 602, Crystallization component one; 603, crystallization component two; 604, crystallization component three; 605, stirring blade; 606, leakage port; 607, cleaning rod one; 608, cleaning rod two; 7, sleeve one; 701, liquid outlet; 8, collecting box; 801, scraper; 802, outer barrel cover; 803, oblique gear ring; 804, auger two; 805, limit cylinder; 806, gear; 9, cleaning pipe; 10, pipeline. DETAILED DESCRIPTION

[0050] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0051] As attached Figure 1 With attached Fig.11 A self-cleaning ammonium perchlorate crystallization kettle is shown, comprising a kettle body 1 and a kettle cover 5. A through feed inlet 501 is provided on the kettle cover 5. A container 601 for containing ammonium perchlorate solution is provided on the top of the kettle body 1. The ammonium perchlorate solution can be fed through the feed inlet 501 and contained in the container 601. At least one crystallization component is provided below the container 601 in the kettle body 1. The ammonium perchlorate solution in the container 601 can be spread on the surface of the crystallization component to complete the crystallization process.

[0052] In the technical solution of the present application, three crystallization parts are provided, namely, crystallization part one 602, crystallization part two 603, and crystallization part three 604, which are arranged in sequence below the container 601 and coaxially. The edges of the container 601 and the crystallization parts are connected to the kettle body 1, and a driving shaft 6 is installed through the center of the top of the kettle cover 5. The driving shaft 6 extends downward through the kettle cover 5 and passes through the container 601 and crystallization parts one 602, crystallization part two 603, and crystallization part three 604 in sequence. Cooling water passes through the inside of the crystallization parts, and crystallization is completed when the ammonium perchlorate solution is spread on the surface of the crystallization parts.

[0053] In the technical solution of the present application, both the container 601 and the crystallization component are configured to be conical, wherein the apex of the cones of the container 601 and the crystallization component 2 603 are configured to face downward, and the apex of the cones of the crystallization component 1 602 and the crystallization component 3 604 are configured to face upward, and the driving shaft 6 can move up and down along the axis of the kettle body 1. When the driving shaft 6 moves downward, the ammonium perchlorate solution in the container 601 will be spread from the apex of the container 601 on the surface of the crystallization component 1 602, and will flow into the crystallization component 2 603 again from the edge of the crystallization component 1 602 for collection, and after collection, it will be spread from the apex of the crystallization component 2 603 on the surface of the crystallization component 3 604 to complete the last crystallization process.

[0054] In order to ensure the mixing effect again after the ammonium perchlorate solution is put into the container 601, the ammonium perchlorate solution will be stirred again to facilitate better precipitation of crystals later.

[0055] like Figures 2 to 6 As shown, the stirring structure is specifically that a sleeve 7 is arranged on the driving shaft 6, the sleeve 7 moves through the top of the container 601, and a stirring blade 605 is arranged on the sleeve 7. When the driving shaft 6 rotates, the stirring blade 605 can be driven to rotate to achieve stirring and mixing of the ammonium perchlorate solution. In the present invention, two stirring blades 605 are arranged, which can be set according to actual conditions in application.

[0056] A liquid outlet 701 is axially provided on the circumferential surface of the sleeve 7, and the length of the liquid outlet 701 is less than the length of the sleeve 7. The bottom of the liquid outlet 701 is preferentially provided with an inclined structure to allow the ammonium perchlorate solution to flow out better. When the drive shaft 6 moves upward, the bottom of the sleeve 7 will block the top of the container 601. In this state, the ammonium perchlorate solution put into the feed port 501 can be contained in the container 601. In this state, the stirring blade 605 has a distance from the top surface of the container 601, and the distance enables the driving shaft 6 to drive the stirring blade 605 to move up and down.

[0057] When the sleeve 7 seals the top of the container 601, the driving shaft 6 stirs the ammonium perchlorate solution through the stirring blades 605. After stirring, the driving shaft 6 moves downward, and the ammonium perchlorate solution flows out through the opened liquid outlet 701, and spreads on the surface of the crystallization piece 602 while following the rotation of the sleeve 7, and completes crystallization on the surface of the crystallization piece 602.

[0058] After the ammonium perchlorate solution is spread on the surface of the crystallization piece 602, crystals are precipitated along the crystallization piece 602. The edge of the crystallization piece 602 is hollowed out. The hollow holes can filter out the ammonium perchlorate solution and retain the crystals. At the same time, in order to collect the crystals on the surface of the crystallization piece 602, a cleaning rod 607 is set on the driving shaft 6. The cleaning rod 607 is set to be close to the surface of the crystallization piece 602. When the driving shaft 6 rotates, the cleaning rod 607 can be driven to rotate synchronously. When the solution is spread on the surface of the crystallization piece 602 and crystallizes, the cleaning rod 607 synchronously scrapes off the precipitated crystals, so that the crystals slide to the edge along the inclined surface of the crystallization piece 602.

[0059] When the sleeve 7 blocks the top of the container 601, the cleaning rod 607 is not close to the surface of the crystallization member 602, and the driving shaft 6 moves downward to discharge the ammonium perchlorate solution, and the crystallization member 602 is synchronously close to the surface of the crystallization member 602.

[0060] The ammonium perchlorate solution flows into the lower layer of the crystallization piece 603 through the edge hollowing of the crystallization piece 1 602 for collection. Since the concentration of the ammonium perchlorate solution decreases after being precipitated through the crystallization piece 1 602, the ammonium perchlorate solution is collected again through the crystallization piece 2 603 to precipitate crystals again.

[0061] like Fig. 9 As shown, a bevel gear ring 803 is arranged on the top surface of the second crystallization member 603, and a toothed structure is arranged on the top surface of the bevel gear ring 803. The bottom of the circumferential surface of the bevel gear ring 803 is hollowed out, and the hollow structure is used for the passage of ammonium perchlorate solution. A limiting cylinder 805 is arranged at the corresponding position of the driving shaft 6, and an outer barrel cover 802 is also arranged on the driving shaft 6 at the top of the limiting cylinder 805. The bottom of the outer barrel cover 802 is open and can be covered on the outside of the bevel gear ring 803 in the initial state.

[0062] An auger 804 is provided on the periphery of the outer barrel cover 802. The shaft of the auger 804 can be rotatably passed through the outer barrel cover 802 and extended into the limiting cylinder 805. At the same time, a gear 806 is provided on the shaft of the auger 804. The gear 806 can mesh with the toothed structure on the top surface of the bevel gear ring 803. When set, the auger 804 is inclined and parallel to the inclined surface of the crystallization piece 603.

[0063] A collecting box 8 is also installed on the circumferential surface of the outer barrel cover 802. The axis of the second auger 804 passes through one end of the collecting box 8. A scraper 801 is also provided at the other end of the collecting box 8. When the driving shaft 6 moves up and down, it will drive the outer barrel cover 802, the limiting cylinder 805, the collecting box 8 and the second auger 804 to move up and down. When the driving shaft 6 moves downward, the outer barrel cover 802 will cover the outside of the bevel gear ring 803 to prevent the solution from being discharged from the hollow bottom of the bevel gear ring 803. When the driving shaft 6 moves upward, the outer barrel cover 802 withdraws from the covering of the bevel gear ring 803. At this time, the solution will be discharged from the hollow bottom of the bevel gear ring 803 and enter the crystallization part three 604.

[0064] like Fig.10 , Fig.11 As shown, the width of one side of the collecting box 8 is smaller than the width of the other side. When the driving shaft 6 moves downward, the side of the collecting box 8 can be close to the surface of the second crystallization piece 603, so that the crystals on the surface of the second crystallization piece 603 can be scraped off and collected in the collecting box 8, so that the auger 804 can effectively transport the crystals to the edge of the second crystallization piece 603.

[0065] When the drive shaft 6 rotates, since the gear 806 is meshed with the bevel gear ring 803, and the bevel gear ring 803 is stationary, the auger 2 804 rotates synchronously with the drive shaft 6 automatically. When the drive shaft 6 moves downward, the auger blades of the auger 2 804 are close to the surface of the crystallization piece 2 603, and the precipitated crystals are transported to the edge of the crystallization piece 2 603 through the auger 2 804. When the solution is discharged, the drive shaft 6 moves upward, and the outer barrel cover 802 withdraws from the cover of the bevel gear ring 803. In this state, the solution can enter from the hollow bottom of the bevel gear ring 803, and be discharged from the top of the crystallization piece 2 603 to the surface of the crystallization piece 3 604, and complete the final crystallization on the surface of the crystallization piece 3 604.

[0066] A cleaning rod 2 608 is also provided at the bottom of the driving shaft 6. The cleaning rod 2 608 is configured to be close to the surface of the crystallization piece 3 604. After the surface of the crystallization piece 3 604 is crystallized, the driving shaft 6 moves downward again, so that the cleaning rod 2 608 can be close to the surface of the crystallization piece 3 604. When the cleaning rod 2 608 rotates with the driving shaft 6, the crystals on the surface of the crystallization piece 3 604 can be scraped off and slide to the edge of the crystallization piece 3 604. The solution after three crystallizations is discharged through the drain port 101 opened at the bottom of the kettle body 1.

[0067] like Figure 4As shown, in order to enable the ammonium perchlorate solution to better precipitate crystals after passing through the crystallization parts, an annular cooling channel 301 is opened inside the crystallization parts 1 602, 603 and 604, and the bottom edges of the crystallization parts 1 602, 603 and 604 are connected with cooling water pipes 3, and the cooling water enters and exits the cooling channel 301 through the cooling water pipes 3, so as to achieve better crystal precipitation of the crystallization parts. In application, the crystallization parts 1 602, 603 and 604 can be connected to cooling water of different temperatures as needed.

[0068] The technical solution of the present invention can realize the study of the influence of the initial concentration of the crystallization liquid, the stirring rate, the cooling rate, and the crystal growing time on the product particle size, and the three crystallization processes can respectively precipitate crystal products with different main particle sizes.

[0069] In order to collect the crystals precipitated on the crystallization piece, leakage ports 606 are opened at the edges of crystallization piece 1 602, crystallization piece 2 603 and crystallization piece 3 604. It should be noted that in the present invention, the edges of the crystallization pieces are all arranged horizontally, and at the same time, the edges of crystallization piece 1 602 and crystallization piece 3 604 are arranged as hollow structures that can filter crystals.

[0070] A discharge pipe 2 is installed at the leakage port 606 at the bottom of the crystallization piece 1 602, the crystallization piece 2 603, and the crystallization piece 3 604. The discharge pipe 2 is connected to one end of the crystallization piece leakage port 606 and is interconnected, so that the precipitated crystals can fall into the discharge pipe 2 through the leakage port 606 when they are sent to the edge through the cleaning rod 1 607, the cleaning rod 2 608 and the auger 2 804.

[0071] like Figure 2 As shown, an auger 201 driven by a motor is also installed in the discharge pipe 2, and the auger 201 is specifically used to deliver the crystals collected in the discharge pipe 2. A crystal discharge port is set at the bottom of one end of the discharge pipe 2. In order to separate the crystals from the solution when they are discharged, the discharge pipe 2 is inclined. At the same time, a hollow structure (not shown in the figure) is set at the bottom of one end of the discharge pipe 2. The solution flows back along the discharge pipe 2 to the hollow outlet at the bottom of the discharge pipe 2 and flows into the lower crystallization member.

[0072] like Figure 7 As shown, in the present invention, in order to enable the driving shaft 6 to move up and down and rotate, a movable shaft 403 is movably arranged at the axis center of the kettle cover 5, the top of the movable shaft 403 is provided with an edge protruding outward, and a plane bearing 405 is arranged below the edge, and a lifting unit 406 is installed between the plane bearing 405 and the kettle cover 5. The lifting equipment can adopt hydraulic cylinders, electric push rods and other equipment to drive the movable shaft 403 to move up and down. At the same time, the movable shaft 403 can also rotate at the axis center of the kettle cover 5 through the plane bearing 405.

[0073] A base frame 401 is provided above the kettle cover 5, a connecting rod 402 is connected between the base frame 401 and the kettle cover 5, and a motor 4 is installed on the top of the base frame 401, the output shaft of the motor 4 extends to the bottom through the base frame 401, and a limit key 404 is provided on the output shaft, the output shaft of the motor 4 is movably inserted into the axis of the movable shaft 403, and through the upper limit key 404 on the output shaft, the motor 4 can drive the movable shaft 403 and the driving shaft 6 synchronously, and the movable shaft 403 is driven to rise and fall through the lifting unit 406.

[0074] After the kettle body 1 completes the crystallization, the container 601 and the crystallization part in the kettle body 1 need to be cleaned to avoid affecting the next crystallization of the ammonium perchlorate solution.

[0075] The cleaning method is that a pipe 10 is provided through the bottom of the kettle body 1, and one end of the pipe 10 is connected to the bottom of the driving shaft 6. It should be noted that in the present invention, the driving shaft 6 is hollow, and the connection between the stirring blade 605 and the cleaning rod is connected. One end of the pipe 10 is movably connected to the bottom of the driving shaft 6, and an external cleaning water source is connected through the pipe 10. A nozzle structure is obliquely provided on the side of the stirring blade 605 and the cleaning rod. During cleaning, cleaning water is fed into the pipe 10, passes through the driving shaft 6, the stirring blade 605 and the cleaning rod, and is sprayed toward the containing part 601 and the crystallization part by the nozzle to realize water spray cleaning. A cleaning pipe 9 is provided on the driving shaft 6 above the crystallization part 603, which is dedicated to cleaning the surface of the crystallization part 603. During cleaning, the driving shaft 6 can rotate slowly, and the water source is discharged through the drain port 101 at the bottom of the kettle body 1 after cleaning.

[0076] The present invention also provides a method for using a self-cleaning ammonium perchlorate crystallization kettle, which is applied to the above-mentioned ammonium perchlorate crystallization kettle and comprises the following steps:

[0077] Step 1: The original ammonium perchlorate solution is put into the container 601 of the kettle body 1, and the stirring blade 605 driven by the driving shaft 6 mixes the solution again;

[0078] Step 2: The driving shaft 6 moves downward, and the outer barrel cover 802 of the synchronous crystallization member 2 603 is covered on the outside of the bevel gear ring 803, and the solution is first discharged from the liquid outlet 701 and spread on the crystallization member 1 602, and crystallizes on the surface of the crystallization member 1 602;

[0079] Step 3: The solution flows into the second crystallization part 603 through the hollow edge of the crystallization part 1 602 and is collected again. The collecting box 8 rotates with the driving shaft 6 to collect the precipitated crystals in the collecting box 8 and transported to the edge of the second crystallization part 603 again with the auger 2 804;

[0080] Step 4: the driving shaft 6 rises, the limiting cylinder 805 withdraws from blocking the top of the second crystallization member 603, the outer barrel cover 802 withdraws from covering the oblique gear ring 803, and the solution is discharged from the top of the second crystallization member 603;

[0081] Step 5: After the solution is discharged from the second crystallization part 603 , it flows into the third crystallization part 604 and crystallizes again along the surface of the third crystallization part 604 .

[0082] This method can be used to study the effects of initial concentration of the crystallization solution, stirring rate, cooling rate, and crystal growing time on product particle size. The three crystallization processes can respectively precipitate crystal products with different main particle sizes.

[0083] Finally, a few points should be explained: First, in the description of this application, it should be noted that, unless otherwise specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, which may refer to mechanical connection or electrical connection, or internal communication between two components, or direct connection. "upper", "lower", "left", "right", etc. are only used to indicate relative positional relationships. When the absolute position of the object being described changes, the relative positional relationship may change;

[0084] Secondly: In the drawings of the embodiments disclosed in the present invention, only the structures related to the embodiments disclosed in the present invention are involved, and other structures can refer to the general design. In the absence of conflict, the same embodiment and different embodiments of the present invention can be combined with each other;

[0085] Finally: The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A self-cleaning ammonium perchlorate crystallization kettle, comprising a kettle body (1) and a kettle cover (5), characterized in that: The kettle body (1) has a container (601) for containing a solution, and a plurality of crystallization components for allowing the solution to precipitate crystals, wherein the container (601) and the crystallization components are both configured in a conical shape; A plurality of crystallization parts are coaxially arranged below the containing part (601); a drive shaft (6) axially arranged inside the kettle body (1), the drive shaft (6) passing through the containing part (601) and the crystallization part in sequence; The driving shaft (6) rotates to stir the solution, and the driving shaft (6) moves up and down to spread or collect the solution on the crystallization member; It also includes a cleaning rod 1 (607), a cleaning rod 2 (608) and a cleaning pipe (9) which rotate with the driving shaft (6) and can clean the containing part (601) and the crystallizing part; There are three crystallization parts, namely, crystallization part 1 (602), crystallization part 2 (603), and crystallization part 3 (604); the edges of the containing part (601) and the crystallization parts are connected to the kettle body (1); The driving shaft (6) extends downward through the kettle cover (5) and passes through the containing part (601) and the crystallization part 1 (602), the crystallization part 2 (603), and the crystallization part 3 (604) in sequence; The apex of the conical shapes of the containing part (601) and the second crystallization part (603) are arranged downward, and the apex of the conical shapes of the first crystallization part (602) and the third crystallization part (604) are arranged upward; The top surface of the second crystallization member (603) is provided with an oblique toothed ring (803), the top surface of the oblique toothed ring (803) is provided with a toothed structure, the bottom of the circumferential surface of the oblique toothed ring (803) is hollowed out, a limiting cylinder (805) is provided at a corresponding position of the driving shaft (6), and an outer barrel cover (802) is also provided on the driving shaft (6) at the top of the limiting cylinder (805), the bottom of the outer barrel cover (802) is open and can be covered on the outside of the oblique toothed ring (803); A second auger (804) is disposed on the periphery of the outer barrel cover (802). The shaft of the second auger (804) can rotatably pass through the outer barrel cover (802) and extend into the limiting cylinder (805). A gear (806) is also disposed on the shaft of the second auger (804). The gear (806) can mesh with the toothed structure on the top surface of the helical gear ring (803). The second auger (804) is inclined and parallel to the inclined surface of the second crystallization member (603). The edges of the crystallization pieces are all provided with material leakage openings (606), and the edges of the crystallization pieces are all arranged horizontally. At the same time, the edges of the crystallization piece 1 (602) and the crystallization piece 3 (604) are arranged with hollow structures capable of filtering crystals; A discharge pipe (2) is installed at the bottom leakage port (606) of the crystallization component 1 (602), the crystallization component 2 (603), and the crystallization component 3 (604), and one end of the discharge pipe (2) connected to the leakage port (606) of the crystallization component is in communication with each other.

2. A self-cleaning ammonium perchlorate crystallization kettle according to claim 1, characterized in that: The driving shaft (6) is provided with a sleeve one (7), the sleeve one (7) movably passes through the top of the container (601), and a stirring blade (605) is provided on the sleeve one (7); A liquid outlet (701) is provided on the circumferential surface of the sleeve one (7) in the axial direction, and the length of the liquid outlet (701) is smaller than the length of the sleeve one (7).

3. A self-cleaning ammonium perchlorate crystallization kettle according to claim 2, characterized in that: A collecting box (8) is mounted on the circumferential surface of the outer barrel cover (802); the shaft of the second auger (804) passes through one end of the collecting box (8); and a scraper (801) is also disposed at the other end of the collecting box (8); The width of one side of the collecting box (8) is smaller than the width of the other side.

4. A self-cleaning ammonium perchlorate crystallization kettle according to any one of claims 1 to 3, characterized in that: An annular cooling channel (301) is provided inside the crystallizing member, and a cooling water pipe (3) is connected at the bottom edge of the crystallizing member. Cooling water enters and exits the cooling channel (301) through the cooling water pipe (3), and the cooling water pipe (3) passes through the kettle body (1) and extends to the outside.

5. A self-cleaning ammonium perchlorate crystallization kettle according to claim 4, characterized in that: The discharge pipe (2) is also provided with an auger (201) driven by a motor. A material outlet for discharging crystals is provided at the bottom of one end of the discharge pipe (2). The discharge pipe (2) is arranged obliquely, and a hollow structure is provided at the bottom of one end of the discharge pipe (2).

6. A self-cleaning ammonium perchlorate crystallization kettle according to claim 5, characterized in that: A movable shaft (403) is movably arranged at the axis center of the kettle cover (5); an edge protruding outward is arranged at the top of the movable shaft (403); a plane bearing (405) is arranged below the edge; and a lifting unit (406) is installed between the plane bearing (405) and the kettle cover (5); A base frame (401) is provided above the kettle cover (5), a connecting rod (402) is connected between the base frame (401) and the kettle cover (5), and a motor (4) is installed on the top of the base frame (401), an output shaft of the motor (4) passes through the base frame (401) and extends to the bottom, and a limit key (404) is provided on the output shaft, and the output shaft of the motor (4) is movably inserted into the axis of the movable shaft (403); A pipe (10) is provided through the bottom of the kettle body (1), and one end of the pipe (10) is connected to the bottom of the driving shaft (6); The driving shaft (6) is hollow and connected to the stirring blade (605) and the cleaning rod. One end of the pipe (10) is movably connected to the bottom of the driving shaft (6). The sides of the stirring blade (605) and the cleaning rod are inclined with a nozzle structure.

7. A method for using a self-cleaning ammonium perchlorate crystallization kettle, applied to the ammonium perchlorate crystallization kettle according to any one of claims 1 to 6, comprising the following steps; Step 1: the original ammonium perchlorate solution is put into the container (601) of the kettle body (1), and the stirring blade (605) driven by the driving shaft (6) mixes the solution again; Step 2: the driving shaft (6) moves downward, and the outer barrel cover (802) of the synchronous crystallization unit (603) is covered on the outside of the bevel gear ring (803), and the solution is first discharged from the liquid outlet (701) and spread on the crystallization unit (602), and the first crystallization is completed in the crystallization unit (602); Step 3: The solution flows into the second crystallization component (603) through the hollow edge of the first crystallization component (602) and is collected again. The collecting box (8) rotates along with the driving shaft (6), and the precipitated crystals are collected in the collecting box (8). The solution is transported to the edge of the second crystallization component (603) by the second auger (804), and the second crystallization is completed. Step 4: the driving shaft (6) rises, the limiting cylinder (805) withdraws from blocking the top of the second crystallization member (603), the outer barrel cover (802) withdraws from covering the oblique gear ring (803), and the solution is discharged from the top of the second crystallization member (603); Step 5: After the solution is discharged from the second crystallization part (603), it flows into the third crystallization part (604) and crystallizes again along the surface of the third crystallization part (604).

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