An apparatus for preparing high-purity magnesium oxide and a control method thereof

Abstract

The application relates to the technical field of magnesium oxide preparation, in particular to equipment for preparing high-purity magnesium oxide and a control method thereof. The equipment comprises a support, a reaction container is fixedly connected to the top of the support, a controller is fixedly installed on the side wall of the support, further comprises two screening discs for screening and pushing the target objects, a driving unit arranged in the reaction container for driving the two screening discs to move close to or away from each other, and two groups of shaking screening assemblies arranged on the sides of the two screening discs moving close to each other. The shaking screening assemblies are arranged, which can help to break the stubborn large block raw materials into smaller pieces, make the particle size of the materials tend to be consistent, and help to make the newly generated small particles enter the interiors of the shaking screening assemblies.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of magnesium oxide preparation, and particularly relates to a device for preparing high-purity magnesium oxide and a control method thereof. BACKGROUND

[0002] Magnesium oxide is an oxide of magnesium, an ionic compound. It is a white solid at room temperature. High-purity magnesium oxide has excellent alkali resistance and electrical insulation at high temperatures. It has a high thermal expansion coefficient and high thermal conductivity, and good light transmittance. It is widely used as a high-temperature refractory material.

[0003] In the prior art, the production of light magnesium carbonate is usually carried out in a reaction device designed to promote the chemical reaction of dolomite powder (mainly composed of calcium magnesium carbonate and magnesium carbonate) with carbon dioxide at a specific temperature and pressure to produce magnesium carbonate. However, the dolomite powder has at least the following problems in the reaction device:

[0004] 1. Because the particle size of the solid raw material such as dolomite is not uniform and is not suitable, too large or too small particles will affect the uniformity of mixing and reaction;

[0005] 2. The dolomite powder may have local accumulation and cavities, which may cause uneven mixing of the dolomite powder and carbon dioxide, affecting the reaction rate of preparing high-purity magnesium oxide and seriously affecting the purity of magnesium oxide. SUMMARY

[0006] The present application aims to solve the problems in the prior art and provides a device for preparing high-purity magnesium oxide and a control method thereof.

[0007] To achieve the above purpose, in a first aspect, the present application provides a device for preparing high-purity magnesium oxide, comprising a support, the top of the support is fixedly connected with a reaction container, the sidewall of the support is fixedly installed with a controller, further comprising:

[0008] Two sieving discs are used to sieve and push the target objects;

[0009] A driving unit is arranged in the interior of the reaction container and is used to drive the two sieving discs to approach or move away from each other;

[0010] Two groups of shaking and sieving assemblies are arranged on the side of the two sieving discs approaching each other;

[0011] In the process of driving the two sieving discs to approach each other by the driving unit, the two groups of shaking and sieving assemblies are used to push and gather the target objects on the internal travel route of the reaction container, and to sieve and crush the particle size in the process of pushing and gathering;

[0012] The swinging screening assembly will impact the remaining raw materials by swinging action during movement, which helps to break the stubborn large pieces of raw materials into smaller pieces, making the particle size of the materials consistent, and helps to make the newly generated small particles enter the interior of the swinging screening assembly, at this time, the swinging screening assembly will participate in the refinement of the raw materials dynamically, and after the raw materials are collected into the interior of the swinging screening assembly, the dynamic impact force generated by the swinging of the swinging screening assembly will help to further subdivide the raw materials, ensuring that the particle size reaches the required specification.

[0013] Preferably, the driving unit comprises:

[0014] A first motor is fixedly installed on the side wall of the reaction container.

[0015] A bidirectional threaded rod is fixedly installed on the output shaft end of the first motor, and the screening disc is threadedly connected to the outer wall of the bidirectional threaded rod.

[0016] Preferably, the swinging screening assembly comprises:

[0017] An electric push rod is fixedly installed on the side wall of the screening disc.

[0018] A U-shaped frame is fixedly connected to the telescopic end of the electric push rod.

[0019] A fan-shaped screening frame is rotatably connected to the side wall of the screening disc, and the bottom of the fan-shaped screening frame is provided with a filter hole.

[0020] Two collecting groove holes are respectively provided in the two side walls of the fan-shaped screening frame.

[0021] A square column is fixedly connected to the fan-shaped screening frame, and the square column is located between the two side walls of the U-shaped frame.

[0022] Preferably, a plurality of auxiliary crushing assemblies are further included, and the auxiliary crushing assembly comprises:

[0023] A grinding disc is rotatably connected to the side wall of the fan-shaped screening frame.

[0024] A connecting column is fixedly connected to the side of the grinding disc close to the center of the fan-shaped screening frame.

[0025] A rectangular filter screen is fixedly connected to one end of the connecting column away from the grinding disc.

[0026] A torsional spring is fixedly installed between the rectangular filter screen and the grinding disc, and the torsional spring is sleeved on the connecting column.

[0027] A blocking column is fixedly connected to the side wall of the screening disc.

[0028] A plurality of groups of crushing rollers are fixedly connected to the side wall of the grinding disc.

[0029] Preferably, the application further comprises:

[0030] A plurality of decomposition knives are fixedly connected to the two sides of the rectangular filter screen.

[0031] Preferably, the application further comprises:

[0032] A detection unit is used to acquire weight information.

[0033] A second motor is fixedly installed on the side wall of the screening disc.

[0034] A crushing roller is fixedly connected to the output shaft end of the second motor.

[0035] Preferably, the detection unit is a weight sensor, and the weight sensor is fixedly installed on the inner bottom surface of the fan-shaped screening frame.

[0036] In a second aspect, the application provides a control method for an equipment for preparing high-purity magnesium oxide, which comprises the following steps:

[0037] The controller receives weight information acquired by the weight sensor.

[0038] The controller generates first control information according to the weight information.

[0039] The controller sends the first control information to the second motor to control the second motor to start.

[0040] Preferably, the specific working process of step one is as follows:

[0041] A threshold value is preset.

[0042] The controller compares the received weight information with the threshold value.

[0043] If the weight information is less than the threshold value, no feedback is given.

[0044] If the weight information is greater than the threshold value, weight information is generated.

[0045] Compared with the prior art, the application has the following beneficial effects:

[0046] 1. The present invention is equipped with a swaying screening component. During its movement, the swaying screening component will impact the remaining raw materials through a swinging action. On the one hand, it helps to break up the stubborn large particles of raw materials into smaller pieces, so that the particle size of the materials tends to be consistent. On the other hand, it helps to encourage these newly generated small particles to enter the interior of the swaying screening component. At this time, the swaying screening component will dynamically participate in the refinement of the raw materials in this process, and after the raw materials are collected into the interior of the swaying screening component, the dynamic impact force generated by the internal swing of the swaying screening component will help to further subdivide the raw materials to ensure that they reach the required particle size specifications.

[0047] 2. The present invention uses the rectangular filter and the crushing roller to decompose and crush the raw materials gathered in front of the fan-shaped screening frame during the deflection process, thereby helping to decompose the raw materials into small particles. After the different groups of crushing rollers located on the two fan-shaped screening frames approach each other, the two crushing rollers will cross each other because the different crushing rollers are staggered, which is conducive to crushing the raw materials again. In the process of the grinding disc swinging back, the crushing rollers located in relative positions and on the same plane will also rotate, thereby effectively utilizing the synergistic effect of the double roller group, which is conducive to more detailed secondary crushing of the raw materials and ensuring that the raw materials are fully decomposed to the desired particle size.

[0048] 3. The present invention obtains the weight information of the raw materials accumulated inside the fan-shaped screening frame through the setting of the crushing roller through the detection unit. If it exceeds the predetermined value range, the controller controls the second motor to start working, and the second motor drives the crushing roller to start rolling, thereby helping to quickly break the accumulated raw materials into small fragments; and the rectangular filter helps to push the raw materials toward the crushing roller in the process of deflecting and returning to push the raw materials, thereby helping the crushing roller to crush and decompose the raw materials. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] Figure 1 This is a flow chart of the control method of the present invention.

[0050] Figure 2 The overall structure of the detection device of the present invention is shown in FIG. Figure 1 .

[0051] Figure 3 The overall structure of the detection device of the present invention is shown in FIG. Figure 2 .

[0052] Figure 4 It is a schematic structural diagram of the present invention along the cross section of the reaction vessel.

[0053] Figure 5 For the present invention Figure 4 The enlarged schematic diagram of the structure of part A is shown.

[0054] Figure 6 Structure diagram of the connection between the sifting disc and the bidirectional threaded rod of the present application Figure 1 .

[0055] Figure 7 Structure diagram of the connection between the sifting disc and the bidirectional threaded rod of the present application Figure 2 .

[0056] Figure 8 Structure diagram of the connection between the bidirectional threaded rod and the fan-shaped sifting frame of the present application Figure 7 .

[0057] Figure 9 Structure diagram of the connection between the bidirectional threaded rod and the fan-shaped sifting frame of the present application

[0058] Figure 10 Structure diagram of the connection between the bidirectional threaded rod and the fan-shaped sifting frame of the present application Figure 9 .

[0059] In the figure: 1, support; 101, feed inlet; 102, discharge outlet; 2, reaction vessel; 3, controller; 4, sifting disc; 5, first motor; 6, bidirectional threaded rod; 7, electric push rod; 8, U-shaped frame; 9, fan-shaped sifting frame; 10, filter hole; 11, collection groove hole; 12, square column; 13, grinding disc; 14, connecting column; 15, rectangular filter screen; 16, torsional spring; 17, blocking column; 18, crushing roller; 19, decomposition knife; 20, second motor; 21, pressure-breaking roller; 22, weight sensor. DETAILED DESCRIPTION

[0060] The following description is provided to enable any person skilled in the art to practice the present application. The preferred embodiments in the following description are only examples of the present application and other obvious modifications are possible to those skilled in the art.

[0061] Application scenario: In the prior art, the production of light magnesium carbonate is usually carried out in a reaction device designed to promote the chemical reaction of dolomite powder (mainly composed of calcium magnesium carbonate and magnesium carbonate) with carbon dioxide at a specific temperature and pressure to generate magnesium carbonate. However, there are at least the following problems with dolomite powder in the reaction device:

[0062] 1. Because the particle size of solid raw materials such as dolomite is uneven and unsuitable, both oversized and undersized particles will affect the uniformity of mixing and reaction;

[0063] 2. Dolomite powder may have local accumulation and cavities, which may cause uneven mixing of dolomite powder with carbon dioxide, affecting the reaction rate of preparing high-purity magnesium oxide and seriously affecting the purity of magnesium oxide.

[0064] AsFigures 2 to 10 The device for preparing high-purity magnesium oxide shown in the embodiment comprises a support 1, a reaction container 2 fixedly connected to the top of the support 1, and a controller 3 fixedly installed on the side wall of the support 1, and further comprises:

[0065] two screening discs 4 for screening and pushing the target objects;

[0066] a driving unit arranged in the interior of the reaction container 2 for driving the two screening discs 4 to approach or move away from each other;

[0067] two groups of shaking and screening assemblies arranged on the side where the two screening discs 4 approach each other;

[0068] In the process of driving the two screening discs 4 to approach each other by the driving unit, the two groups of shaking and screening assemblies are used for pushing and gathering the target objects on the internal travel route in the reaction container 2 and screening and crushing the particle size in the process of pushing and gathering;

[0069] In the specific implementation, the operator first places the raw material to be prepared into the reaction container 2, then sequentially adds the required substances and gas components according to the requirements, at the same time, starts the driving unit to ensure that the entire reaction process is carried out under accurate control, the rotation of the driving unit drives the two screening discs 4 to approach each other, in the process of the two screening discs 4 approaching each other, the small particles with a diameter smaller than the screen hole can pass through smoothly, while the larger particles that fail to pass through the screen are pushed to the center of the reaction container 2 by the combined force of the two discs, in this interaction, the two screening discs 4 drive the corresponding shaking and screening assemblies at the positions to approach each other, and the shaking and screening assemblies will impact the remaining raw material by swinging in the moving process, on the one hand, it helps to break the stubborn large block of raw material into smaller pieces, so that the particle size of the material tends to be consistent, on the other hand, it helps to promote the newly generated small particles to enter the interior of the shaking and screening assembly, at this time, the shaking and screening assembly dynamically participates in the refinement of the raw material in this process, and after the raw material is collected into the interior of the shaking and screening assembly, the dynamic impact force generated by the swinging of the shaking and screening assembly helps to further subdivide the raw material to ensure that it reaches the required particle size specification, and the broken particles meeting the specification fall into the interior of the reaction container 2 through the shaking and screening assembly, in this process, because the shaking and screening assemblies gradually approach each other, it is also beneficial to prevent the local accumulation of the raw material.

[0070] It should be noted that the reaction container 2 is provided with existing parts such as a feeding port 101, a discharging port 102, and a gas inlet, which are not disclosed here.

[0071] As a technical optimization scheme of the present application, the driving unit comprises:

[0072] The first motor 5 is fixedly installed on the side wall of the reaction container 2.

[0073] The bidirectional threaded rod 6 is fixedly installed on the output shaft end of the first motor 5, and the screening disc 4 is threadedly connected to the outer wall of the bidirectional threaded rod 6.

[0074] In specific implementation, the controller 3 controls the first motor 5 to start, the first motor 5 drives the bidirectional threaded rod 6 to rotate, and the bidirectional threaded rod 6 drives the screening discs 4 on the corresponding threaded parts to approach or move away from each other.

[0075] It should be noted that the diameter of the screening disc 4 is equal to the inner diameter of the reaction container 2, the outer wall of the screening disc 4 is fitted with the inner diameter of the reaction container 2, and the screening disc 4 cannot rotate under the limitation of the inner wall of the reaction container 2, so as to facilitate the approach of the screening discs 4.

[0076] As a technical optimization scheme of the present application, the shaking and screening assembly comprises:

[0077] The electric push rod 7 is fixedly installed on the side wall of the screening disc 4.

[0078] The U-shaped frame 8 is fixedly connected to the telescopic end of the electric push rod 7.

[0079] The fan-shaped screening frame 9 is rotatably connected to the side wall of the screening disc 4, and the bottom of the fan-shaped screening frame 9 is provided with the filter hole 10.

[0080] The two collection groove holes 11 are respectively provided on the two side walls of the fan-shaped screening frame 9.

[0081] The square column 12 is fixedly connected to the fan-shaped screening frame 9, and the square column 12 is located between the two side walls of the U-shaped frame 8.

[0082] In specific implementation, the controller 3 controls the electric push rod 7 to start telescoping, the electric push rod 7 pushes the U-shaped frame 8 to move, the side wall of the U-shaped frame 8 contacts the square column 12 to push the square column 12 to swing, the square column 12 drives the fan-shaped screening frame 9 to swing, and the fan-shaped screening frame 9 impacts the raw material blocks on the moving route in the process of swinging, so as to facilitate the decomposition of large broken blocks into small broken blocks. In this process, the fan-shaped screening frame 9 effectively pushes the raw materials deposited at the bottom of the reaction container 2 towards both sides, which facilitates the uniform distribution of the accumulated raw materials and prevents the accumulation of a large amount of materials in front of the fan-shaped screening frame 9, thereby avoiding the problem of increased moving resistance caused by excessive accumulation. Through the swinging of the fan-shaped screening frame 9, the dispersion of the raw materials is promoted, and the smoothness of the moving path is ensured.

[0083] The raw materials dispersed by the impact will enter the inside of the fan-shaped screening frame 9 through the collecting groove holes 11, so as to facilitate further breaking and crushing of the raw materials entering the inside of the fan-shaped screening frame 9 by the dynamic impact force generated by the swinging of the fan-shaped screening frame 9, and make the crushed materials meeting the specifications fall back through the filter holes 10, and the materials not meeting the specifications are repeatedly broken again until they are discharged.

[0084] As a technical optimization scheme of the present application: further comprising a plurality of auxiliary breaking assemblies, the auxiliary breaking assembly comprising:

[0085] A grinding disc 13 is rotationally connected to the side wall of the fan-shaped screening frame 9;

[0086] A connecting column 14 is fixedly connected to the side of the grinding disc 13 close to the center of the fan-shaped screening frame 9;

[0087] A rectangular filter screen 15 is fixedly connected to one end of the connecting column 14 away from the grinding disc 13;

[0088] A torsion spring 16 is fixedly installed between the rectangular filter screen 15 and the grinding disc 13, and the torsion spring 16 is sleeved on the connecting column 14;

[0089] A blocking column 17 is fixedly connected to the side wall of the screening disc 4;

[0090] A plurality of breaking rollers 18 are fixedly connected to the side wall of the grinding disc 13 in a circumferential array, and each group of the breaking rollers 18 has a plurality of breaking rollers;

[0091] In the above examples, it is illustrated that the larger raw material blocks are broken and gradually refined into small particles meeting the specified size through the repeated action of the fan-shaped screening frame 9, however, during the approach of the fan-shaped screening frames 9 to each other, a part of the more difficult to handle chunks will often accumulate in front of the fan-shaped screening frames 9, and these chunks are not easy to be completely crushed to the ideal state for various reasons;

[0092] Therefore, during the swinging of the sector-shaped screening frame 9, the grinding disc 13 will also be driven to rotate, the grinding disc 13 will drive the connecting column 14 to swing, and the connecting column 14 will drive the rectangular filter 15 to swing. Due to the restriction of the blocking column 17, after the rectangular filter 15 contacts the blocking column 17, the rectangular filter 15 will be deflected with the connecting column 14 as the axis. After the rectangular filter 15 is deflected, the grinding disc 13 will be driven to deflect through the connecting column 14, and the grinding disc 13 will drive the crushing roller 18 to rotate, so that the crushing roller 18 is used to decompose the raw materials gathered in front of the sector-shaped screening frame 9 during the deflection process. Crushing, thereby helping to decompose the raw materials into small particles, and after the different groups of crushing rollers 18 located on the two fan-shaped screening frames 9 approach each other, because the different crushing rollers 18 are staggered, the two crushing rollers 18 will cross each other, which is conducive to crushing the raw materials again, and in the process of the grinding disc 13 swinging back, the crushing rollers 18 located in the relative position and on the same plane will also rotate, thereby effectively utilizing the synergistic effect of the double roller group, helping to perform more detailed secondary crushing of the raw materials, and ensuring that the raw materials are fully decomposed to the desired particle size;

[0093] And in the process of the two rectangular filter screens 15 flipping back to their original positions, the spring force generated by the torsion spring 16 will push the material better toward the inner center of the fan-shaped screening frame 9 through the movement of the rectangular filter screen 15, which helps to prevent the raw materials from being thrown out through the collection slot during the subsequent swinging process.

[0094] It should be noted that there are two sector-shaped screening frames 9, and each sector-shaped screening frame 9 is provided with three groups of crushing rollers 18. The two groups of crushing rollers 18 located in different sector-shaped screening frames 9 are opposite to each other, are in relative positions and are located on the same horizontal plane. The circumferential array of each group of crushing rollers 18 forms a circle, and the diameters of the circles formed by the two opposite groups of crushing rollers 18 are different, so that when the opposite crushing rollers 18 approach one of the groups, they are located in the circle of the other group.

[0095] As a technical optimization solution of the present invention: it also includes:

[0096] A plurality of decomposition knives 19 are fixedly connected to the two sides of the rectangular filter 15 at corresponding positions;

[0097] In the specific implementation, as mentioned in the above embodiment, some raw materials that do not meet the particle size standard will be introduced into the fan-shaped screening frame 9 for further refinement. However, relying solely on the kinetic energy generated during the swinging process for crushing may result in a low processing rate, affecting the overall production efficiency.

[0098] Therefore, by setting the decomposition knife 19, the raw material is decomposed and crushed after contacting the blade of the decomposition knife 19 during the shaking process, which helps to enhance the crushing efficiency and helps to avoid the occurrence of internal accumulation of the fan-shaped screening frame 9.

[0099] As a technical optimization scheme of the present application: further comprising:

[0100] The detection unit is configured to obtain weight information.

[0101] The second motor 20 is fixedly installed on the side wall of the screening disc 4.

[0102] The pressure-breaking roller 21 is fixedly connected to the output shaft end of the second motor 20.

[0103] In specific implementation, the detection unit obtains weight information of the raw materials accumulated in the fan-shaped screening frame 9, and if the weight information exceeds a predetermined range, the controller 3 controls the second motor 20 to start working, and the second motor 20 drives the pressure-breaking roller 21 to start rolling, thereby helping to quickly break down the accumulated raw materials into small pieces.

[0104] The rectangular filter screen 15 helps to push the raw materials in the direction of the pressure-breaking roller 21 during the deflection and return, thereby helping the pressure-breaking roller 21 to break down the raw materials.

[0105] As a technical optimization scheme of the present application: the detection unit is specifically a weight sensor 22, and the weight sensor 22 is fixedly installed on the inner bottom surface of the fan-shaped screening frame 9.

[0106] In specific implementation, the weight sensor 22 is configured to obtain weight information and feed the result back to the controller 3 for analysis.

[0107] As Figure 1 shown, a control method of an equipment for preparing high-purity magnesium oxide, the control method comprising the following steps:

[0108] The controller 3 receives weight information obtained by the weight sensor 22.

[0109] The controller 3 generates first control information according to the weight information.

[0110] The controller 3 sends the first control information to the second motor 20 to control the second motor 20 to start.

[0111] As a technical optimization scheme of the present application: wherein the specific working process of step one is:

[0112] A threshold value is preset.

[0113] The controller 3 compares the received weight information with the threshold value.

[0114] If the weight information is less than the threshold value, no feedback is made.

[0115] If the weight information is greater than the threshold value, weight information is generated.

[0116] The working principle of the present application is as follows:

[0117] The operator first places the raw materials to be prepared into the reaction container 2, then adds the required substances and gas components in sequence according to requirements, at the same time, starts the driving unit to ensure that the entire reaction process is carried out under precise control, the rotation of the driving unit drives the two screening discs 4 to move closer to each other, in the process of the two screening discs 4 moving closer to each other, those small particles with a diameter smaller than the screen hole can pass smoothly, while the larger particles that fail to pass through the screen will be pushed by the combined force of the two discs to the center of the reaction container 2, in this interaction, the two screening discs 4 will bring the corresponding position of the swinging screening assembly closer to each other, and the swinging screening assembly will implement impact on the screened raw materials through swinging action during movement, on the one hand, it helps to break stubborn large pieces of raw materials into smaller pieces, so that the particle size of the material tends to be consistent, on the other hand, it helps to promote these newly generated small particles to enter the inside of the swinging screening assembly, at this time, the swinging screening assembly will dynamically participate in the refinement of the raw materials in this process, and after the raw materials are collected into the inside of the swinging screening assembly, the dynamic impact force generated by the swinging of the swinging screening assembly will help to further subdivide the raw materials to ensure that they reach the required particle size specification, and the broken particles that meet the specification will fall back to the inside of the reaction container 2 through the swinging screening assembly, in this process, because the swinging screening assemblies are gradually moving closer to each other, it is also beneficial to prevent the occurrence of local accumulation of raw materials.

[0118] The basic principle, main features and advantages of the present application are shown and described above. Those skilled in the art should understand that the present application is not limited by the above examples, the above examples and descriptions in the specification are only the principles of the present application, various changes and improvements can be made without departing from the spirit and scope of the present application, and these changes and improvements all fall within the scope of the claimed present application.

Claims

1. An apparatus for preparing high-purity magnesium oxide, comprising a support (1), a reaction container (2) is fixedly connected to the top of the support (1), a controller (3) is fixedly installed on the sidewall of the support (1), characterized in that: Also include: Two sieving discs (4) for sieving and pushing the target objects; A drive unit arranged inside the reaction container (2) for driving the two sieving discs (4) to move closer to or away from each other; Two groups of shaking and screening assemblies are arranged on the side of the two sieving discs (4) that move closer to each other; During the process of driving the two sieving discs (4) to move closer to each other by the drive unit, the two groups of shaking and screening assemblies are used to push and gather the target objects on the internal travel route in the reaction container (2), and to screen and crush the particle size during the process of pushing and gathering; The drive unit comprises: A first motor (5) fixedly installed on the side wall of the reaction container (2); A bidirectional threaded rod (6) fixedly installed on the output shaft end of the first motor (5), and the sieving disc (4) is threadedly connected to the outer wall of the bidirectional threaded rod (6); The shaking and screening assembly comprises: An electric push rod (7) fixedly installed on the side wall of the sieving disc (4); A U-shaped frame (8) fixedly connected to the telescopic end of the electric push rod (7); A fan-shaped screening frame (9) rotatably connected to the side wall of the sieving disc (4), and a filter hole (10) is formed in the bottom of the fan-shaped screening frame (9); Two collection groove holes (11) are respectively formed in the two side walls of the fan-shaped screening frame (9); A square column (12) fixedly connected to the fan-shaped screening frame (9), and the square column (12) is located between the two side walls of the U-shaped frame (8); It also includes a plurality of auxiliary crushing assemblies, the auxiliary crushing assembly comprises: A grinding disc (13) rotatably connected to the side wall of the fan-shaped screening frame (9); A connecting column (14) fixedly connected to the center of the side of the grinding disc (13) close to the fan-shaped screening frame (9); A rectangular filter screen (15) fixedly connected to one end of the connecting column (14) away from the grinding disc (13); A torsional spring (16) fixedly installed between the rectangular filter screen (15) and the grinding disc (13), and the torsional spring (16) is sleeved on the connecting column (14); A blocking column (17) fixedly connected to the side wall of the sieving disc (4); A plurality of crushing rollers (18), each group of crushing rollers (18) has a plurality of, which are fixedly connected to the side wall of the grinding disc (13) in a circumferential array.

2. The apparatus for preparing high-purity magnesium oxide according to claim 1, characterized by: Also include: A plurality of decomposition knives (19) are respectively fixedly connected to the two sides of the rectangular filter screen (15) at the corresponding positions.

3. The apparatus for preparing high purity magnesium oxide according to claim 1, wherein: Also include: A detection unit for acquiring weight information; A second motor (20) fixedly installed on the side wall of the sieving disc (4); A crushing roller (21) fixedly connected to the output shaft end of the second motor (20).

4. The apparatus for preparing high-purity magnesium oxide according to claim 3, characterized by: The detection unit is a weight sensor (22), and the weight sensor (22) is fixedly installed on the inner bottom surface of the fan-shaped screening frame (9).

5. A control method for a plant for the production of high-purity magnesium oxide, suitable for use in a plant for the production of high-purity magnesium oxide as claimed in claim 4, characterized in that: The control method comprises the following steps: The controller (3) receives the weight information acquired by the weight sensor (22); The controller (3) generates first control information according to the weight information; The controller (3) sends the first control information to the second motor (20) to control the second motor (20) to start.

6. The control method of the apparatus for preparing high-purity magnesium oxide according to claim 5, characterized by: The specific work flow of step one is: A threshold value is preset; The controller (3) compares the received weight information with the threshold value; If less than the threshold value, no feedback is made; If greater than the threshold value, the weight information is generated.

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