Device for synthesizing magnesium hydroxide active flame retardant

Abstract

The utility model discloses a device for synthesizing a magnesium hydroxide active flame retardant. The device comprises a reaction kettle, a feeding mechanism, an atomizer, a temperature measuring element, a pressure measuring element, a control unit, an aging development tank and the like, the device can simultaneously complete hydration of magnesium oxide and modification of magnesium hydroxide, and realizes crystal form regulation and control based on a mechanical activation technology; the reaction process is controlled by the arranged atomizer to form a saturated vapor pressure condition, so that the hydration process is short in reaction time and high in efficiency; the water adding amount is calculated according to the magnesium oxide content, so that the generated flame retardant product does not need a drying process, and the energy consumption is low; a plurality of hydration activator systems are constructed, and surface modification is performed during hydration reaction, so that the agglomeration phenomenon of magnesium hydroxide particles is overcome, and the flaky active magnesium hydroxide flame retardant with uniform crystal particles is further prepared. The device is reasonable in structural design and high in synthesis reaction efficiency, a hydration process and an activation process are completed at the same time, and continuous circulation production of synthesized magnesium hydroxide is easy to realize.

Description

Technical Field

[0001] This utility model belongs to the field of chemical equipment technology, and in particular relates to a device for the hydrothermal generation of magnesium hydroxide from highly active magnesium oxide, specifically a device for synthesizing active flame retardant magnesium hydroxide. Background Technology

[0002] Magnesium-based flame retardant materials possess multiple advantages, including multiple flame retardant properties, low smoke, non-toxicity, and no secondary pollution to the environment. Their particularly high smoke suppression performance aligns well with current trends in material safety. Converting abundant magnesite resources into flame retardant products and effectively improving the actual flame retardant effect of magnesium-based flame retardant materials is beneficial for the sustainable development of the inorganic flame retardant industry and overcomes the drawbacks of halogen-based flame retardant materials, which produce large amounts of toxic and corrosive gases during combustion. Magnesium hydroxide is widely used as an environmentally friendly material due to its wide availability of raw materials, good thermal stability, non-volatile nature, and lack of precipitation. However, magnesium hydroxide flame retardants produced by grinding and processing natural brucite have several technical challenges. High addition levels are required to achieve the desired flame retardant effect, significantly impacting the physical and processing properties of polymer materials. Furthermore, magnesium hydroxide produced by the natural brucite method is mostly hexagonal with a large specific surface area. Due to the polarity between particles, it is prone to agglomeration, resulting in poor dispersion in polymers.

[0003] Currently, the main production methods for synthesizing magnesium hydroxide include selective calcination of dolomite, electrolytic brine, and magnesium salt precipitation. Among these, selective calcination of dolomite is limited by the process and can only produce low-quality magnesium hydroxide. The electrolytic method relies on electrolytic purification of high-concentration magnesium chloride solution, which consumes a lot of electricity and has high production costs. The magnesium salt precipitation method requires a large amount of acid and alkali, and the subsequent processing is cumbersome and expensive. The core technology of the precipitation method is the magnesium hydroxide chemical reactor. Most of the production equipment for producing magnesium hydroxide by precipitation in the world uses large reactors with a diameter of about 20m. Large reactors have many drawbacks, such as large equipment size, high initial investment, low reaction intensity, and high energy consumption during production and operation. For example, the patent with publication number CN2268023Y, "A reaction tank for producing magnesium hydroxide", discloses a chemical reactor for producing magnesium hydroxide by reacting brine and lime milk. This reactor has defects such as complex internal structure, inability of the liquid to circulate in the tank, and large amount of liquid loss in the slag discharge. At the same time, the magnesium hydroxide solution generated in the liquid environment requires filtration and drying process, which not only increases energy consumption, but also causes particle agglomeration and reduces the application performance of flame retardants. Utility Model Content

[0004] To overcome the shortcomings of the existing technology, this utility model provides a chemical reaction device for activated magnesium hydroxide with a reasonable structure and simple equipment. Its purpose is to achieve crystal form control based on mechanical activation technology, control the reaction process through a set atomizer to form saturated vapor pressure conditions, so that the hydration process has a short reaction time and low energy consumption; calculate the amount of water added according to the magnesium oxide content, so that the generated flame retardant product does not require a drying process; and perform surface modification during the hydration reaction to overcome the agglomeration of magnesium hydroxide particles, thereby preparing a uniformly crystalline flake-shaped activated magnesium hydroxide flame retardant.

[0005] To achieve the above-mentioned objective, this invention provides an apparatus for synthesizing magnesium hydroxide active flame retardant, the apparatus comprising:

[0006] The reactor is equipped with components such as a feed inlet, a discharge outlet, a stirring paddle, a heating jacket, baffles, and a motor.

[0007] The feeding mechanism includes a conveying pipe with two open ends. One open end is connected to the feed inlet and equipped with an electric valve. The other open end is used to convey raw material (highly active magnesium oxide powder) and is connected to the raw material conveying equipment. A hydration activator inlet is provided on the conveying pipe, and a conveying auger is rotatably installed inside the conveying pipe.

[0008] An atomizer is installed on the lid of the reactor to create saturated vapor pressure conditions inside the reactor, and is connected to the water tank and the surface modifier dilution tank via a delivery pump.

[0009] Temperature measuring elements and pressure measuring elements are installed on the vessel body of the reactor.

[0010] The control unit is connected to the reactor, feeding mechanism, atomizer, temperature measuring element, pressure measuring element and delivery pump via wiring; the control unit acquires the temperature and pressure values ​​inside the reactor and starts and stops each component based on preset thresholds.

[0011] The aging and development tank is connected to the discharge port via a discharge pipeline.

[0012] The hydration method is a process for preparing magnesium hydroxide using magnesium oxide as a raw material through a hydration reaction. It utilizes modifiers, dispersants, filter aids, and seed crystals to adjust morphology and control particle size and purity. The reactor serves as the core component of the magnesium hydroxide synthesis unit, enabling heating, evaporation, cooling, and low-to-high-speed mixing of chemical raw materials. The feeding mechanism is activated by the control unit, and the hydration activator is uniformly added at a specific mass ratio through the hydration activator feed port. Under the stirring of the conveying auger, it is uniformly mixed with the raw material (highly active magnesium oxide powder) and fed into the reactor through the reactor inlet. After feeding is complete, the electric valve of the feeding mechanism is closed. Water from the water tank or liquid from the surface modifier dilution tank is sprayed into the reactor in a mist form by an atomizer via a delivery pump, ensuring thorough mixing and reaction with the raw material. Temperature and pressure measuring elements collect real-time temperature and pressure values ​​inside the reactor and feed them back to the control unit. After acquiring these values, the control unit opens and closes the heating jacket based on preset thresholds and supplies raw material water and surface modifier via the delivery pump, ensuring that the temperature and pressure values ​​inside the reactor meet the preset thresholds, thus meeting the technical conditions for the hydration reaction of magnesium oxide raw materials. The pressure value is adjusted based on the temperature and water vapor content inside the reactor. By adjusting the synthesis environment and process parameters, the formation of magnesium hydroxide crystal defects and the regulation of microstructure changes are suppressed. After high-pressure steam hydration, magnesium hydroxide with a hydration rate greater than 90% can be obtained, and the wet-steam hydration product has a better crystal morphology. Further aging allows the reaction to proceed fully, resulting in fully developed crystal grains. The final magnesium hydroxide particles are square-shaped flakes with small particle size and good dispersibility.

[0013] In the above technical solution, the reactor body is further provided with a stirring paddle, a baffle plate is set in the middle of the reactor body and close to the inner wall of the reactor body, a heating jacket is fixed to the reactor body, and a motor is fixed to the top of the reactor body.

[0014] The heating jacket enables temperature control of the reaction system within the reactor, promoting material reaction and improving yield and product quality. A servo motor is located at the center of the reactor lid's top. The output shaft of the servo motor passes through the top of the lid and is coaxially connected to a rotating shaft. The end of the rotating shaft is connected to a stirring paddle. The servo motor drives the rotating shaft to rotate, which in turn drives the stirring paddle to agitate the materials within the reactor. During the magnesium oxide hydration reaction to produce magnesium hydroxide, the high-speed rotating stirring paddle generates significant shear force, causing magnesium oxide particles to rapidly renew the phase interface. This effectively prevents magnesium hydroxide from crystallizing on the magnesium oxide surface, reducing heterogeneous nucleation and improving reaction efficiency. The baffles within the reactor disrupt the material flow, causing irregular movement and creating vortices near the baffles, accelerating mixing. The position of the baffles within the reactor can be flexibly adjusted vertically and horizontally according to the feed level. Increasing the temperature intensifies molecular motion, increases the percentage of activated molecules, and accelerates the reaction. At the same time, as the temperature rises, the steam content increases, and the pressure inside the reactor increases, which is conducive to the reaction. In addition, increasing the stirring speed can increase the energy of the reacting molecules and increase the frequency of molecular collisions, which also accelerates the reaction rate.

[0015] Furthermore, the raw material conveyed by the feeding mechanism is highly active magnesium oxide powder. The highly active magnesium oxide powder has a particle size of 6–18 μm and a specific surface area of ​​15–60 m². 2 / g, with an absorption value of 30-40 mol / kg of chloride ions; by increasing the activity of magnesium oxide, the activation energy of the hydration reaction is reduced, the energy of the reaction molecules is increased, thereby accelerating the reaction rate and facilitating crystal form control.

[0016] Furthermore, the hydration activator added through the feeding port is magnesium oxalate powder, and the amount added is 2% to 3% of the mass of magnesium oxide. The hydration activator not only alters the morphology of magnesium hydroxide but also has a certain influence on the hydration reaction of magnesium oxide. After magnesium oxalate dissolves in water, it dissociates to release CH3COO. - CH3COO - Compared to other anions, it has a stronger complexing ability, promotes the hydration reaction, and plays a significant role in promoting the hydration of magnesium oxide.

[0017] Furthermore, the delivery pump first atomizes the water in the tank via an atomizer and sprays it into the reactor body, where it reacts fully under stirring. When the water volume reaches the required amount for hydration, the water supply is stopped, and the control valve between the surface modifier dilution tank and the delivery pump is opened. The surface modifier is then atomized via an atomizer and sprayed into the reactor body for powder surface modification. The surface modifier in the surface modifier dilution tank is a silane coupling agent. Diluting the coupling agent into an aqueous solution allows for more uniform spraying. If the silane coupling agent has poor water solubility, it can be diluted with approximately 0.1% to 2.0% acetic acid solution or a water-ethanol mixture before use. Acetic acid has the dual effect of promoting the hydrolysis of silane coupling agents and improving the stability of silanols. The amount of water used for diluting the surface modifier is taken into account when calculating the amount of water required for the hydration reaction.

[0018] Surface modifiers are added to adsorb onto the surface of magnesium hydroxide microcrystals, forming a protective film that reduces surface energy, effectively preventing magnesium hydroxide agglomeration and decreasing the average particle size. Surfactants are added based on the mass of magnesium hydroxide produced, calculated according to the complete conversion of magnesium oxide. Silane coupling agents alter the surface properties of magnesium oxide, increasing the contact angle of magnesium hydroxide adhesion, thus increasing the nucleation work and decreasing the nucleation rate of heterogeneous nucleation. Preparing silane coupling agents into solutions using water facilitates their dispersion on the surface of inorganic particles. Since silane coupling agents interact with inorganic particle surfaces through van der Waals forces, hydrogen bonds, and chemical bonds, they facilitate the organic modification of inorganic particles.

[0019] Furthermore, the aging and development tank is equipped with heating and heat preservation components. The preset temperature of the aging and development tank is 120℃~140℃, and the temperature is maintained for 3~4 hours. The top cover of the aging and development tank is provided with several one-way vents. When the reaction inside the aging and development tank is fully completed, excess adhering water evaporates and generates gas, which can be discharged through these vents, allowing the product to reach a dry state. From a chemical thermodynamic perspective, reducing the radius of hydrated ions is endothermic, while ion hydration is an exothermic reaction. Increasing the temperature can overcome the nucleation barrier. Therefore, pre-preparing a well-crystallized magnesium hydroxide product and maintaining it at a certain temperature for development is a key step in the process.

[0020] The working process of the above-mentioned apparatus for synthesizing magnesium hydroxide active flame retardant is as follows: (see attached diagram) Figure 1As shown, the control unit first activates the feeding mechanism, uniformly adding the hydration activator at a certain mass ratio through the hydration activator inlet. Under the stirring of the conveying auger, it mixes evenly with the incoming raw material (highly active magnesium oxide powder) and is then fed into the reactor through the reactor inlet. After feeding is completed, the electric valve of the feeding mechanism is closed. The control unit activates the reactor's stirring paddle and heating jacket to maintain the modification reaction temperature of the raw material; activating the stirring paddle simultaneously with feeding improves the modification reaction effect. Next, the control unit activates the atomizer, which atomizes and disperses the water and surface modifier from the water tank and sprays them into the reactor, allowing the raw material to react with the water first, followed by surface modification. The pressure is adjusted based on the temperature and water vapor content within the reactor. Temperature and pressure measuring elements collect real-time temperature and pressure values ​​inside the reactor; the control unit acquires the temperature and pressure values ​​and activates or deactivates relevant components based on preset thresholds to ensure that the temperature and pressure values ​​inside the reactor meet the preset thresholds; after the raw materials complete the hydration reaction in the reactor, they are transported to an aging and development tank through a discharge pipeline for crystal development, ultimately obtaining a flaky magnesium hydroxide active flame retardant product with uniform crystalline particles; the finished flame retardant in the aging and development tank is discharged through a discharge system and packaged for storage.

[0021] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0022] This invention relates to a device that can simultaneously perform the hydration of magnesium oxide and the modification of magnesium hydroxide, with a simple preparation process and low equipment cost. Based on mechanical activation technology, homogenization is reduced through stirring to achieve crystal form control; the reaction process is controlled by an atomizer to create saturated vapor pressure conditions, resulting in a short hydration reaction time, high hydration efficiency, and low energy consumption; a multi-hydration activator system is constructed to control crystal defect formation, facilitating the formation of flake-shaped magnesium hydroxide particles; the amount of water added is calculated according to the magnesium oxide content, eliminating the need for a drying process in the generated active flame retardant product, saving energy and simplifying the process; and surface modification is performed simultaneously with the hydration reaction, overcoming the agglomeration of magnesium hydroxide particles, thus enabling the preparation of flake-shaped active magnesium hydroxide flame retardants with uniform crystalline particles. The device has a reasonable structural design, high synthesis reaction efficiency, and simultaneous completion of the hydration and activation processes, facilitating continuous cyclic production of synthesized magnesium hydroxide flame retardants. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the apparatus for synthesizing magnesium hydroxide active flame retardant according to the present invention;

[0024] Figure 2 SEM images of magnesium hydroxide flame retardant samples prepared using the apparatus for synthesizing magnesium hydroxide active flame retardant according to this invention, as shown in the examples.

[0025] In the diagram: 1-Reaction vessel; 2-Feeding mechanism; 3-Atomizer; 4-Temperature measuring element; 5-Pressure measuring element; 6-Control unit; 7-Transfer pump; 8-Water tank; 9-Surface modifier dilution tank; 10-Aging and development tank; 11-Inlet; 12-Outlet; 13-Agitator; 14-Heating jacket; 15-Discharge pipeline; 16-Heating and insulation components; 17-One-way exhaust port; 18-Baffle plate; 21-Hydration activator feed port; 22-Conveying auger. Detailed Implementation

[0026] The technical solution of this utility model will be clearly and completely described below with reference to the accompanying drawings. However, this utility model is not limited to the specific details of the following embodiments. Within the scope of the technical concept of this utility model, various simple modifications can be made to the technical solution of this utility model, and all such simple modifications fall within the protection scope of this utility model.

[0027] Unless otherwise specified, the specific structures, connections, positions, power sources, etc. involved in this utility model are all things that a person skilled in the art can know without creative effort based on the prior art.

[0028] It should be noted that the terms "upper", "lower", "left", "right", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this technical solution and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model patent.

[0029] The high-activity magnesium oxide powder used in the example has a particle size of 8 μm and a specific surface area of ​​56 m². 2 / g, the chloride ion absorption value is 36mol / kg; the activity determination method of magnesium oxide powder refers to YB / T 4019-2020 "Method for Determination of Chemical Activity of Lightly Burned Magnesium Oxide".

[0030] Example

[0031] An apparatus for synthesizing magnesium hydroxide active flame retardant, the apparatus comprising:

[0032] The reactor 1 is equipped with a feed inlet 11, a discharge outlet 12, a stirring paddle 13, a heating jacket 14, a baffle plate 18, and a motor.

[0033] The feeding mechanism 2 includes a conveying pipe with two open ends. One open end is connected to the feed port 11 and is equipped with an electric valve. (The other open end is used to convey raw material - high-activity magnesium oxide powder.) A hydration activator feeding port 21 is provided on the conveying pipe. A conveying auger 22 is rotatably installed inside the conveying pipe.

[0034] Atomizer 3 is installed on the lid of the reactor 1 to create saturated vapor pressure conditions inside the reactor, and is connected to water tank 8 and surface modifier dilution tank 9 respectively via delivery pump 7.

[0035] Temperature sensing element 4 and pressure sensing element 5 are installed on the vessel body of the reaction vessel 1;

[0036] The control unit 6 is connected to the reactor 1, the feeding mechanism 2, the atomizer 3, the temperature measuring element 4, the pressure measuring element 5, and the delivery pump 7 via wiring. The control unit 6 acquires the temperature and pressure values ​​inside the reactor 1 and starts and stops each component based on preset thresholds.

[0037] The aging and development tank 10 is connected to the discharge port 12 via the unloading pipeline 15.

[0038] The reactor 1 is equipped with a stirring paddle 13, a baffle plate 18 is located in the middle of the reactor body, a heating jacket 14 is fixed to the reactor body, and a motor is fixed to the top of the reactor body. The raw material conveyed by the feeding mechanism 2 is high-activity magnesium oxide powder; the hydration activator added by the hydration activator inlet 21 is magnesium oxalate powder. The delivery pump 7 first atomizes the water in the water tank 8 and sprays it into the reactor body of the reactor 1 through the atomizer 3; when the water volume reaches the required amount for hydration, the water supply is stopped, and the control valve between the surface modifier dilution tank 9 and the delivery pump 7 is opened to atomize the surface modifier through the atomizer 3 and spray it into the reactor body of the reactor 1 for powder surface modification. The aging and development tank 10 is equipped with heating and heat preservation components 16, and the top cover of the aging and development tank 10 is equipped with a one-way exhaust port 17.

[0039] The operation process of the above-mentioned apparatus for synthesizing magnesium hydroxide active flame retardant is as follows: Figure 1 As shown, the specific process steps are as follows:

[0040] ① The control unit 6 activates the feeding mechanism 2, uniformly adding the hydration activator at a certain mass ratio through the hydration activator inlet 21. Under the stirring of the conveying auger 22, it mixes evenly with the incoming raw material (highly active magnesium oxide powder) and is then fed into the reactor 1 through the inlet 11. After the feeding is completed, the electric valve of the feeding mechanism 2 is closed. The hydration activator is magnesium oxalate MgC2O4·2H2O white powder with a relative density of 2.45, and the amount added is 3% of the mass of magnesium oxide.

[0041] ② The control unit 6 turns on the stirring paddle 13 and heating jacket 14 of the reactor 1, so that the raw material is maintained in a constant modification reaction temperature range of 105℃~120℃ and is uniformly stirred at a stirring rate of 1000~1200r / min.

[0042] ③ The delivery pump 7 first atomizes the water in the water tank 8 and injects it into the reactor 1 through the atomizer 3. When the water volume reaches the required amount for hydration (the water volume is calculated as 1.1 times the amount of magnesium oxide that is completely hydrated, and the water volume for surfactant dilution is also considered), the water supply is stopped, and the control valve between the surface modifier dilution tank 9 and the delivery pump 7 is opened. The surface modifier is then atomized through the atomizer 3 and injected into the reactor 1 for surface modification. This allows the raw material to react with water first, and then react with the surface modifier at the stated reaction temperature to undergo a surface modification reaction. Atomized steam is injected to form high-temperature and high-pressure steam reaction conditions. The surface modifier in the surface modifier dilution tank 9 is a silane coupling agent KH560, and the dosage is calculated as 3% of the mass of magnesium hydroxide produced after the magnesium oxide is completely hydrated, and diluted with water to a concentration of 5%.

[0043] ④ Temperature sensing element 4 and pressure sensing element 5 collect the temperature and pressure values ​​inside the reactor 1 in real time and feed them back to control unit 6. After acquiring the temperature and pressure values, control unit 6 opens and closes the heating jacket 14 based on a preset threshold and supplies raw material water and surface modifier through delivery pump 7, so that the temperature and pressure values ​​inside the reactor meet the preset threshold, which is suitable for the technical conditions of the hydration reaction of magnesium oxide raw material. The preset threshold pressure value is set to 0.1-0.2 MPa, the temperature value is set to 105℃-120℃, and the hydration reaction time is controlled to 3-4 hours.

[0044] ⑤ The material that has undergone hydration reaction in reactor 1 is transported to aging tank 10 through discharge pipeline 15. The aging temperature is controlled within the range of 120℃~140℃ by heating and heat preservation components 16 installed in aging tank 10, and maintained at this temperature for 3~4 hours, ultimately obtaining the finished magnesium hydroxide active flame retardant. The finished product is then sealed and packaged after transportation, or delivered directly to the user's workshop in sealed tank trucks. Calculations show that the above high-pressure steam hydration reaction can achieve a raw material hydration rate of greater than 90%. The remaining attached water during the aging process evaporates to generate gas and is discharged through one-way exhaust port 17, resulting in a reduction of the moisture content of the active flame retardant product to below 0.5%.

[0045] The activation index of the prepared magnesium hydroxide active flame retardant was determined: A sample m of the magnesium hydroxide active flame retardant was weighed using an electronic balance. oAdd the sample, accurate to 0.1 mg, to a beaker containing 150 ml of distilled water. Stir magnetically for 5 minutes to promote sample dissolution and precipitation. Let stand for 2 hours, remove the floating portion, and collect the precipitate at the bottom of the beaker. Place the precipitate in a watch glass and dry to constant weight. Weigh the precipitate using an electronic balance. i ;

[0046] H=(1-m i / m o )×100%

[0047] Where: H is the sample activation index; m o m is the total mass of the sample. i The mass of the precipitated powder is expressed in grams (g).

[0048] Testing revealed that the activation index (for multiple samples) of the prepared magnesium hydroxide active flame retardant was greater than 95%, which meets the industry filling requirements for polymers.

[0049] The prepared magnesium hydroxide active flame retardant samples were observed by SEM. Figure 2 It can be seen that the prepared magnesium hydroxide active flame retardant crystals are blade-shaped, with a crystal length of 3-5 μm and a width of 1.0-1.5 μm; the thickness of a single crystal is less than 100 nm, and the thickness of multiple crystal aggregates is less than 200 nm. The particles are uniformly crystallized and do not agglomerate.

[0050] For anyone skilled in the art, many possible variations and modifications can be made to the technical solution of this utility model without departing from the scope of the present utility model. Therefore, any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of this utility model, without departing from its scope, should still fall within the protection scope of this utility model.

Claims

1. An apparatus for synthesizing magnesium hydroxide active flame retardant, characterized in that, The device comprises: a reaction kettle (1) provided with a feeding port (11), a discharging port (12), a stirring paddle (13), a heating jacket (14), a baffle (18) and a motor; a feeding mechanism (2) comprising a feeding pipe having two open ends, one of which is connected to the feeding port (11) and is provided with an electric valve, and a hydration activator feeding port (21) is formed on the feeding pipe, and a conveying auger (22) is rotatably installed in the feeding pipe; an atomizer (3) installed on the kettle cover of the reaction kettle (1) for forming a saturated vapor pressure condition in the reaction kettle and being connected with a water tank (8) and a surface modifier dilution tank (9) through a conveying pump (7); a temperature measuring element (4) and a pressure measuring element (5) installed on the kettle body of the reaction kettle (1); a control unit (6) connected with the reaction kettle (1), the feeding mechanism (2), the atomizer (3), the temperature measuring element (4), the pressure measuring element (5) and the conveying pump (7) through lines; the control unit (6) obtains the temperature and pressure values in the reaction kettle (1) and starts and stops each component based on a preset threshold value; an aging development tank (10) connected with the discharging port (12) through a discharging pipeline (15).

2. The apparatus of claim 1, wherein, The stirring paddle (13) is arranged in the kettle body of the reaction kettle (1), the baffle (18) is arranged in the middle of the kettle body, the heating jacket (14) is fixedly arranged on the kettle body of the reaction kettle (1), and the motor is fixedly arranged on the top of the kettle body of the reaction kettle (1).

3. The apparatus of claim 1, wherein, The feeding mechanism (2) conveys high-activity magnesium oxide powder as raw materials.

4. The apparatus of claim 1, wherein, The hydration activator added through the hydration activator feeding port (21) is magnesium oxalate powder.

5. The apparatus of claim 1, wherein, The surface modifier in the surface modifier dilution tank (9) is a silane coupling agent.

6. The apparatus of claim 1, wherein, The aging development tank (10) is provided with a heating and heat preservation element (16).

7. The apparatus of claim 1, wherein, A one-way exhaust hole (17) is arranged on the top cover of the aging development tank (10).

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