A device for preparing large-particle magnesium sulfate heptahydrate

Abstract

The utility model relates to the technical fields of chemical industry machinery, in particular to a kind of preparation device of large particle magnesium sulfate heptahydrate, it not only can to magnesium sulfate heptahydrate crystallization, but also can separate out after crystallization magnesium sulfate heptahydrate in solution, it is convenient to use, and labor intensity is low, and practicality is high;Including bottom plate, support and crystallizing cylinder, support is fixedly installed on bottom plate, crystallizing cylinder is fixedly installed in the right part of support, chamber is provided in crystallizing cylinder, the upper end of crystallizing cylinder is set as opening, a plurality of refrigerating plates are provided on crystallizing cylinder, the refrigeration end of multiple refrigerating plates is embedded into the inner side wall of crystallizing cylinder, and the heat dissipation end of refrigerating plate is located at the outside of crystallizing cylinder;It also includes hydraulic cylinder, push rod, filter plate, concentration mechanism, conveying mechanism, stirring mechanism and moving mechanism, hydraulic cylinder is fixedly installed on bottom plate upper end, push rod is slidably installed on crystallizing cylinder, the lower end of push rod is connected with the output end of hydraulic cylinder, and filter plate is fixedly installed on the upper end of push rod.

Description

Technical Field

[0001] This utility model relates to the technical field of chemical machinery, and in particular to a device for preparing large-particle magnesium sulfate heptahydrate. Background Technology

[0002] Magnesium sulfate heptahydrate, also known as magnesium sulfate, is mainly used in the manufacture of fertilizers, leather, printing and dyeing, catalysts, papermaking, plastics, ceramics, pigments, matches, explosives, and fireproof materials. The production of magnesium sulfate heptahydrate requires the concentration and crystallization of a magnesium sulfate solution to obtain crystallized magnesium sulfate heptahydrate. In the prior art, a utility model patent with patent application number 202222471791.9 discloses a rapid crystallization device for magnesium sulfate heptahydrate using a crystallization kettle. This device mainly consists of a stirring mechanism and a kettle body. During the production of magnesium sulfate heptahydrate, a magnesium sulfate solution is added to the kettle body, and then the solution is stirred and crystallized to obtain magnesium sulfate heptahydrate crystals. However, this device has the following problems: after crystallization in the magnesium sulfate solution, workers still need to manually remove the crystallized magnesium sulfate heptahydrate from the solution, making it inconvenient and labor-intensive. Therefore, a device that can automatically separate the crystallized magnesium sulfate heptahydrate from the solution is needed. Utility Model Content

[0003] To solve the above-mentioned technical problems, this utility model provides a large-particle magnesium sulfate heptahydrate preparation device that can not only crystallize magnesium sulfate heptahydrate, but also separate the crystallized magnesium sulfate heptahydrate in solution. It is convenient to use, has low labor intensity, and is highly practical.

[0004] This utility model relates to a device for preparing large-particle magnesium sulfate heptahydrate, comprising a base plate, a support, and a crystallization cylinder. The support is fixedly mounted on the base plate, and the crystallization cylinder is fixedly mounted on the right side of the support. The crystallization cylinder contains a chamber, with an opening at its upper end. Multiple cooling plates are mounted on the crystallization cylinder, with their cooling ends embedded in the inner wall of the cylinder and their heat dissipation ends located on the outer side. The device also includes a hydraulic cylinder, a push rod, a filter plate, a concentration mechanism, a conveying mechanism, a stirring mechanism, and a moving mechanism. The hydraulic cylinder is fixedly mounted on the upper part of the base plate, and the push rod slides up and down. Installed on the crystallization cylinder, the lower end of the push rod is connected to the output end of the hydraulic cylinder. The filter plate is fixedly installed on the upper end of the push rod, located at the lower end of the crystallization cylinder chamber. The filter plate has multiple vertically connected filter holes, and a filter cloth is installed on the upper end of the filter plate. The filter plate is slidably installed in the crystallization cylinder chamber, with a sealed sliding connection between the outer wall of the filter plate and the inner wall of the crystallization cylinder. The concentration mechanism is installed on the left side of the support, and has a concentration function. The conveying mechanism is connected to the concentration mechanism and the crystallization cylinder. The stirring mechanism is installed on the moving mechanism, which is used for... The stirring mechanism moves; during the production of magnesium sulfate heptahydrate, the magnesium sulfate solution is first added to the concentration mechanism for concentration. Then, the concentrated magnesium sulfate solution is transported to the crystallization cylinder chamber via a conveying mechanism. Next, multiple cooling plates on the crystallization cylinder are opened to cool the magnesium sulfate solution inside the chamber, reducing its concentration. Simultaneously, magnesium sulfate heptahydrate seed crystals are added to the crystallization cylinder chamber, causing the magnesium sulfate in the solution to absorb water and form crystals. The magnesium sulfate heptahydrate then adheres to the seed crystals and crystallizes, forming magnesium sulfate heptahydrate particles. With greater precision, after magnesium sulfate heptahydrate crystallizes, the hydraulic cylinder is opened. The hydraulic cylinder, through the push rod, raises the filter plate, which in turn raises the filter plate at the lower end of the crystallization chamber. During the upward movement of the filter plate, the crystallized magnesium sulfate heptahydrate in the crystallization chamber rises together with the filter plate until the filter plate rises above the liquid surface in the crystallization chamber, allowing the crystals to be separated from the solution in the crystallization chamber. It can not only crystallize magnesium sulfate heptahydrate, but also separate the crystallized magnesium sulfate heptahydrate from the solution. It is convenient to use, has low labor intensity, and is highly practical.

[0005] Preferably, the concentration mechanism includes a concentration cylinder and a heater. The concentration cylinder is fixedly installed on the left side of the support. A cavity is provided inside the concentration cylinder, and the upper end of the concentration cylinder is set as an opening. The heater is installed on the concentration cylinder, and the output end of the heater is located in the cavity of the concentration cylinder. In the production of magnesium sulfate heptahydrate, the magnesium sulfate solution is first added to the cavity of the concentration cylinder. Then, the heater is turned on to heat the magnesium sulfate solution, promote the evaporation of water in the magnesium sulfate solution, and concentrate the magnesium sulfate solution. Then, the concentrated magnesium sulfate solution is transported to the crystallization cylinder for crystallization. By concentrating the magnesium sulfate solution, the crystallization of magnesium sulfate solution in the crystallization cylinder is facilitated.

[0006] Preferably, the conveying mechanism includes a conveying pump, a conveying pipe A, and a conveying pipe B. The conveying pump is fixedly mounted on the base plate. The input end of the conveying pump is connected to the cavity of the concentration cylinder through the conveying pipe A, and the output end of the conveying pump is connected to the chamber of the crystallization cylinder through the conveying pipe B. Both the conveying pipe A and the conveying pipe B are equipped with valves. After the magnesium sulfate solution is concentrated in the concentration cylinder, the conveying pump is turned on, allowing the concentrated magnesium sulfate solution in the concentration cylinder to enter the crystallization cylinder for crystallization sequentially through the conveying pipe A, the conveying pump, and the conveying pipe B. This facilitates the conveying of the magnesium sulfate solution.

[0007] Preferably, the stirring mechanism includes a sealing cover, a motor, and a stirring shaft. The sealing cover is mounted on a moving mechanism for moving the sealing cover. The motor is fixedly mounted on the upper end of the sealing cover, and the stirring shaft is rotatably mounted on the sealing cover. Multiple stirring blades are provided at the lower part of the stirring shaft. The sealing cover is located above the concentration cylinder. When the magnesium sulfate solution is concentrated in the concentration cylinder, the moving mechanism is opened, causing the sealing cover to descend to the upper end of the concentration cylinder, sealing the upper end of the concentration cylinder. At the same time, the stirring shaft is positioned inside the cavity of the concentration cylinder. Then, the motor is turned on, and the motor drives the stirring shaft to rotate. The rotating stirring shaft causes the magnesium sulfate solution in the cavity of the concentration cylinder to be uniformly heated and concentrated. When the magnesium sulfate solution cools and crystallizes in the crystallization cylinder, the sealing cover is moved to the upper end of the crystallization cylinder, and then the sealing cover is lowered to seal the upper end of the crystallization cylinder. Then, the motor is turned on, causing the stirring shaft to rotate. The rotating stirring shaft promotes the movement of the solution in the crystallization cylinder cavity, allowing the solution to cool and crystallize uniformly. At the same time, it causes the seed crystals to be uniformly dispersed in the crystallization cylinder cavity, facilitating the adhesion of magnesium sulfate heptahydrate crystals to the seed crystals for crystallization.

[0008] Preferably, the moving mechanism includes an electric slide rail A, a sliding plate, and a horizontal moving mechanism. The electric slide rail A is mounted on the horizontal moving mechanism, which is used to move the electric slide rail A horizontally. The sliding plate is mounted on the electric slide rail A, which is used to raise and lower the sliding plate. The sealing cover is fixedly mounted on the sliding plate. When adjusting the height of the sealing cover, the electric slide rail A is opened, and the electric slide rail A adjusts the height of the sliding plate, thereby allowing the sliding plate to adjust the height of the sealing cover. This facilitates the adjustment of the sealing cover height.

[0009] Preferably, the horizontal moving mechanism includes an electric slide rail B and a sliding plate. The electric slide rail B is mounted on the upper end of the base plate, and the sliding plate is mounted on the electric slide rail B. The electric slide rail B is used to move the sliding plate left and right. The electric slide rail A is fixedly mounted on the upper end of the sliding plate. When moving the sealing cover left and right, the electric slide rail B is opened, and the electric slide rail B drives the sliding plate to move in the left and right direction. The sliding plate, through the electric slide rail A, causes the sliding plate to move the sealing cover in the left and right direction. This facilitates the left and right movement of the sealing cover, allowing the stirring mechanism to stir not only in the concentration tank but also in the crystallization tank.

[0010] Preferably, it also includes a vacuum pump, which is installed on the concentration cylinder and its input end is connected to the upper part of the cavity of the concentration cylinder. When heating and concentrating the magnesium sulfate solution in the cavity of the concentration cylinder, after the sealing cover seals the upper end of the concentration cylinder, the vacuum pump is turned on to reduce the pressure in the concentration cylinder, so that the magnesium sulfate solution in the concentration cylinder can be evaporated and concentrated at a lower temperature, thereby improving the concentration effect of the magnesium sulfate solution.

[0011] Preferably, a thermometer is provided on the crystallization cylinder; this facilitates the monitoring of the temperature of the magnesium sulfate solution inside the crystallization cylinder chamber.

[0012] Compared with the prior art, the advantages of this utility model are: it can not only crystallize magnesium sulfate heptahydrate, but also separate the crystallized magnesium sulfate heptahydrate in the solution, which is convenient to use, has low labor intensity, and is highly practical. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the isometric structure of this utility model;

[0014] Figure 2 This is a structural diagram of the stirring mechanism and the moving mechanism;

[0015] Figure 3 This is a schematic diagram of the stirring mechanism;

[0016] Figure 4 This is a schematic diagram of the conveying mechanism;

[0017] Figure 5 This is a structural diagram of the hydraulic cylinder, push rod, and filter plate.

[0018] The following are labels in the attached diagram: 1. Base plate; 2. Support; 3. Crystallizing cylinder; 4. Hydraulic cylinder; 5. Push rod; 6. Filter plate; 7. Concentrating cylinder; 8. Heater; 9. Transfer pump; 10. Transfer pipe A; 11. Transfer pipe B; 12. Sealing cover; 13. Motor; 14. Stirring shaft; 15. Electric slide rail A; 16. Sliding plate; 17. Electric slide rail B; 18. Sliding plate; 19. Vacuum pump; 20. Thermometer. Detailed Implementation

[0019] To facilitate understanding of this utility model, a more complete description will be given below with reference to the accompanying drawings. This utility model can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to make the disclosure of this utility model more thorough and complete. Example 1

[0020] like Figures 1 to 5The apparatus for preparing large-particle magnesium sulfate heptahydrate of this invention includes a base plate 1, a support 2, a crystallizing cylinder 3, a hydraulic cylinder 4, a push rod 5, a filter plate 6, a concentration mechanism, a conveying mechanism, a stirring mechanism, and a moving mechanism. The support 2 is fixedly installed on the base plate 1, and the crystallizing cylinder 3 is fixedly installed on the right side of the support 2. The crystallizing cylinder 3 has a chamber inside, and the upper end of the crystallizing cylinder 3 is open. Multiple cooling plates are installed on the crystallizing cylinder 3, with the cooling ends of the cooling plates embedded in the inner wall of the crystallizing cylinder 3 and the heat dissipation ends of the cooling plates located on the outer side of the crystallizing cylinder 3. The hydraulic cylinder 4 is fixedly installed on the upper end of the base plate 1, and the push rod 5... The push rod 5 is slidably mounted on the crystallizing cylinder 3. The lower end of the push rod 5 is connected to the output end of the hydraulic cylinder 4. The filter plate 6 is fixedly mounted on the upper end of the push rod 5. The filter plate 6 is located at the lower end of the chamber of the crystallizing cylinder 3. The filter plate 6 is provided with multiple vertically connected filter holes. The upper end of the filter plate 6 is provided with filter cloth. The filter plate 6 is slidably mounted on the chamber of the crystallizing cylinder 3. The outer side wall of the filter plate 6 and the inner side wall of the crystallizing cylinder 3 are sealed and slidably connected. The concentration mechanism is installed on the left side of the support 2. The concentration mechanism has the function of concentration. The conveying mechanism is connected to the concentration mechanism and the crystallizing cylinder 3. The stirring mechanism is mounted on the moving mechanism. The moving mechanism is used to move the stirring mechanism. In the production of magnesium sulfate heptahydrate, the magnesium sulfate solution is first added to the concentration mechanism for concentration. Then, the concentrated magnesium sulfate solution is transported to the chamber of crystallization cylinder 3 via the conveying mechanism. Next, multiple cooling plates on crystallization cylinder 3 are opened to cool the magnesium sulfate solution in the chamber, reducing its concentration. Simultaneously, magnesium sulfate heptahydrate seed crystals are added to the chamber of crystallization cylinder 3, causing the magnesium sulfate in the solution to absorb water and form crystals. The magnesium sulfate heptahydrate then adheres to the seed crystals and crystallizes, forming magnesium sulfate heptahydrate particles. With greater precision, after magnesium sulfate heptahydrate crystallizes, hydraulic cylinder 4 is opened. Hydraulic cylinder 4, through push rod 5, causes filter plate 6 to rise, which in turn causes filter plate 6 to rise at the lower end of the crystallization cylinder 3 chamber. During the rising process, the crystallized magnesium sulfate heptahydrate in the crystallization cylinder 3 chamber rises together with filter plate 6 until filter plate 6 rises above the liquid surface in the crystallization cylinder 3 chamber, allowing the crystallized crystals to be separated from the solution in the crystallization cylinder 3 chamber. It can not only crystallize magnesium sulfate heptahydrate, but also separate the crystallized magnesium sulfate heptahydrate from the solution. It is convenient to use, has low labor intensity, and is highly practical.

[0021] like Figure 1The concentration mechanism includes a concentration cylinder 7 and a heater 8. The concentration cylinder 7 is fixedly installed on the left side of the support 2. The concentration cylinder 7 has a cavity inside and an opening at its upper end. The heater 8 is installed on the concentration cylinder 7, and its output end is located inside the cavity of the concentration cylinder 7. In the production of magnesium sulfate heptahydrate, the magnesium sulfate solution is first added to the cavity of the concentration cylinder 7. Then, the heater 8 is turned on to heat the magnesium sulfate solution, promoting the evaporation of water in the magnesium sulfate solution and concentrating the magnesium sulfate solution. The concentrated magnesium sulfate solution is then transported to the crystallization cylinder 3 for crystallization. By concentrating the magnesium sulfate solution, the crystallization of the magnesium sulfate solution in the crystallization cylinder 3 is facilitated.

[0022] like Figure 1 and Figure 4 The conveying mechanism includes a conveying pump 9, a conveying pipe A10, and a conveying pipe B11. The conveying pump 9 is fixedly installed on the base plate 1. The input end of the conveying pump 9 is connected to the cavity of the concentration cylinder 7 through the conveying pipe A10, and the output end of the conveying pump 9 is connected to the chamber of the crystallization cylinder 3 through the conveying pipe B11. Both the conveying pipe A10 and the conveying pipe B11 are equipped with valves. After the magnesium sulfate solution is concentrated in the concentration cylinder 7, the conveying pump 9 is turned on, so that the concentrated magnesium sulfate solution in the concentration cylinder 7 enters the crystallization cylinder 3 for crystallization in sequence through the conveying pipe A10, the conveying pump 9, and the conveying pipe B11. This facilitates the conveying of the magnesium sulfate solution.

[0023] like Figure 1 and Figure 3 The stirring mechanism includes a sealing cover 12, a motor 13, and a stirring shaft 14. The sealing cover 12 is mounted on a moving mechanism for moving the sealing cover 12. The motor 13 is fixedly mounted on the upper end of the sealing cover 12. The stirring shaft 14 is rotatably mounted on the sealing cover 12. Multiple stirring blades are provided at the lower part of the stirring shaft 14. The sealing cover 12 is located above the concentration cylinder 7. When the magnesium sulfate solution is concentrated in the concentration cylinder 7, the moving mechanism is opened, causing the sealing cover 12 to descend to the upper end of the concentration cylinder 7, sealing the upper end of the concentration cylinder 7 with the sealing cover 12. At the same time, the stirring shaft 14 is positioned inside the cavity of the concentration cylinder 7. Then, the mechanism is opened. Motor 13 drives stirring shaft 14 to rotate. The rotating stirring shaft 14 causes the magnesium sulfate solution in the cavity of the concentration cylinder 7 to be heated and concentrated evenly. When the magnesium sulfate solution cools and crystallizes in the crystallization cylinder 3, the sealing cover 12 is moved to the top of the crystallization cylinder 3. Then the sealing cover 12 is lowered to seal the upper end of the crystallization cylinder 3. Then the motor 13 is turned on to make stirring shaft 14 rotate. The rotating stirring shaft 14 promotes the movement of the solution in the cavity of the crystallization cylinder 3, so that the solution cools and crystallizes evenly. At the same time, it makes the seed crystals evenly dispersed in the cavity of the crystallization cylinder 3, so that the magnesium sulfate heptahydrate crystals can attach to the seed crystals and crystallize.

[0024] like Figure 1 and Figure 2The moving mechanism includes an electric slide rail A15, a sliding plate 16, and a horizontal moving mechanism. The electric slide rail A15 is mounted on the horizontal moving mechanism, which is used to move the electric slide rail A15 horizontally. The sliding plate 16 is mounted on the electric slide rail A15, which is used to raise and lower the sliding plate 16. The sealing cover 12 is fixedly mounted on the sliding plate 16. When adjusting the height of the sealing cover 12, the electric slide rail A15 is opened, and the electric slide rail A15 adjusts the height of the sliding plate 16, thereby allowing the sliding plate 16 to adjust the height of the sealing cover 12. This facilitates the adjustment of the height of the sealing cover 12.

[0025] The horizontal movement mechanism includes an electric slide rail B17 and a sliding plate 18. The electric slide rail B17 is mounted on the upper end of the base plate 1, and the sliding plate 18 is mounted on the electric slide rail B17. The electric slide rail B17 is used to move the sliding plate 18 left and right. The electric slide rail A15 is fixedly mounted on the upper end of the sliding plate 18. When moving the sealing cover 12 left and right, the electric slide rail B17 is opened, and the electric slide rail B17 drives the sliding plate 18 to move in the left and right direction. The sliding plate 18, through the electric slide rail A15, causes the sliding plate 16 to move the sealing cover 12 in the left and right direction. This facilitates the left and right movement of the sealing cover 12, allowing the stirring mechanism to stir not only in the concentration cylinder 7 but also in the crystallization cylinder 3.

[0026] like Figure 1 It also includes a vacuum pump 19, which is installed on the concentration cylinder 7. The input end of the vacuum pump 19 is connected to the upper part of the cavity of the concentration cylinder 7. When the magnesium sulfate solution in the cavity of the concentration cylinder 7 is heated and concentrated, after the sealing cover 12 seals the upper end of the concentration cylinder 7, the vacuum pump 19 is turned on to reduce the pressure in the concentration cylinder 7, so that the magnesium sulfate solution in the concentration cylinder 7 can be evaporated and concentrated at a lower temperature, thereby improving the concentration effect of the magnesium sulfate solution. Example 2

[0027] Based on Example 1, a thermometer 20 is installed on the crystallization cylinder 3; the above-mentioned installation facilitates the monitoring of the temperature of the magnesium sulfate solution in the chamber of the crystallization cylinder 3.

[0028] The filter plate 6, heater 8, delivery pump 9, electric slide rail B17, vacuum pump 19 and thermometer 20 of the large particle magnesium sulfate heptahydrate preparation device of this utility model are all purchased from the market. Technical personnel in this industry only need to install and operate them according to the accompanying instruction manual, without requiring any creative work from those skilled in the art.

[0029] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A device for preparing large-particle magnesium sulfate heptahydrate, comprising a base plate (1), a support (2), and a crystallization cylinder (3), wherein the support (2) is fixedly installed on the base plate (1), the crystallization cylinder (3) is fixedly installed on the right side of the support (2), a chamber is provided inside the crystallization cylinder (3), the upper end of the crystallization cylinder (3) is provided as an opening, and multiple cooling plates are provided on the crystallization cylinder (3), the cooling ends of the multiple cooling plates are all embedded in the inner wall of the crystallization cylinder (3), and the heat dissipation ends of the cooling plates are all located on the outer side of the crystallization cylinder (3); characterized in that, It also includes a hydraulic cylinder (4), a push rod (5), a filter plate (6), a concentration mechanism, a conveying mechanism, a stirring mechanism, and a moving mechanism. The hydraulic cylinder (4) is fixedly installed on the upper end of the base plate (1). The push rod (5) is slidably installed on the crystallizing cylinder (3). The lower end of the push rod (5) is connected to the output end of the hydraulic cylinder (4). The filter plate (6) is fixedly installed on the upper end of the push rod (5). The filter plate (6) is located at the lower end of the chamber of the crystallizing cylinder (3). The filter plate (6) is provided with multiple vertically connected filter holes. The upper end of the filter plate (6) is provided with filter cloth. The filter plate (6) is slidably installed in the chamber of the crystallizing cylinder (3). The outer wall of the filter plate (6) and the inner wall of the crystallizing cylinder (3) are connected in a sealed sliding manner. The concentration mechanism is installed on the left side of the bracket (2). The concentration mechanism has the function of concentration. The conveying mechanism is connected to the concentration mechanism and the crystallizing cylinder (3). The stirring mechanism is installed on the moving mechanism. The moving mechanism is used to move the stirring mechanism.

2. The apparatus for preparing large-particle magnesium sulfate heptahydrate as described in claim 1, characterized in that, The concentration mechanism includes a concentration cylinder (7) and a heater (8). The concentration cylinder (7) is fixedly installed on the left side of the bracket (2). A cavity is provided inside the concentration cylinder (7). The upper end of the concentration cylinder (7) is set as an opening. The heater (8) is installed on the concentration cylinder (7). The output end of the heater (8) is located inside the cavity of the concentration cylinder (7).

3. The apparatus for preparing large-particle magnesium sulfate heptahydrate as described in claim 2, characterized in that, The conveying mechanism includes a conveying pump (9), a conveying pipe A (10), and a conveying pipe B (11). The conveying pump (9) is fixedly installed on the base plate (1). The input end of the conveying pump (9) is connected to the cavity of the concentration cylinder (7) through the conveying pipe A (10). The output end of the conveying pump (9) is connected to the chamber of the crystallizing cylinder (3) through the conveying pipe B (11). Both the conveying pipe A (10) and the conveying pipe B (11) are equipped with valves.

4. The apparatus for preparing large-particle magnesium sulfate heptahydrate as described in claim 2, characterized in that, The stirring mechanism includes a sealing cover (12), a motor (13), and a stirring shaft (14). The sealing cover (12) is mounted on a moving mechanism, which is used to move the sealing cover (12). The motor (13) is fixedly mounted on the upper end of the sealing cover (12). The stirring shaft (14) is rotatably mounted on the sealing cover (12). Multiple stirring blades are provided on the lower part of the stirring shaft (14). The sealing cover (12) is located above the concentration cylinder (7).

5. The apparatus for preparing large-particle magnesium sulfate heptahydrate as described in claim 4, characterized in that, The moving mechanism includes an electric slide rail A (15), a sliding plate (16), and a horizontal moving mechanism. The electric slide rail A (15) is mounted on the horizontal moving mechanism, which is used to move the electric slide rail A (15) horizontally. The sliding plate (16) is mounted on the electric slide rail A (15), which is used to raise and lower the sliding plate (16). The sealing cover (12) is fixedly mounted on the sliding plate (16).

6. The apparatus for preparing large-particle magnesium sulfate heptahydrate as described in claim 5, characterized in that, The horizontal moving mechanism includes an electric slide rail B (17) and a sliding plate (18). The electric slide rail B (17) is installed on the upper end of the base plate (1), and the sliding plate (18) is installed on the electric slide rail B (17). The electric slide rail B (17) is used to move the sliding plate (18) left and right. The electric slide rail A (15) is fixedly installed on the upper end of the sliding plate (18).

7. The apparatus for preparing large-particle magnesium sulfate heptahydrate as described in claim 2, characterized in that, It also includes a vacuum pump (19), which is installed on the concentrator (7) and the input end of the vacuum pump (19) is connected to the upper part of the cavity of the concentrator (7).

8. The apparatus for preparing large-particle magnesium sulfate heptahydrate as described in claim 1, characterized in that, A thermometer (20) is installed on the crystallizing cylinder (3).

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