Refractory heat-insulating brick with connecting tenons

Abstract

The invention relates to the technical field of fireproof heat-insulating bricks, and discloses a fireproof heat-insulating brick with a connecting tenon, the fireproof heat-insulating brick comprises a brick body, the middle part of the brick body is provided with a filling cavity, the outer wall of the filling cavity is fixedly connected with a first tenon, one end of the brick body is internally provided with a connecting groove, and the outer wall of the first tenon is arranged on the inner wall of the connecting groove; a second tenon is fixedly connected to the outer wall of the brick body, and a limiting groove is formed in the other end of the brick body. The overall performance of the brick body is improved by filling a heat insulation material into the filling cavity, the groove in the lower portion of the brick body can increase the contact area with ground concrete and enhance the wall surface stability during use, the second tenon on the outer wall of the other brick body is arranged in the limiting groove in one side of the brick body for joggling during joggling, and meanwhile the connecting groove slides into the inner wall of the first tenon. The clamping groove of the groove of the upper brick body is rapidly positioned through the positioning tenons, the positions are flexibly determined through the multiple positioning tenons, and the flexibility and the building efficiency of the brick body are improved.

Description

Technical Field

[0001] The invention relates to the technical field of refractory heat-insulating bricks, in particular to refractory heat-insulating bricks with connecting tenons. Background Art

[0002] Refractory insulation bricks are used in kilns and thermal equipment in industrial fields, such as steel, chemical, ceramics and other industries, to ensure safe and stable operation of the production process and extend the service life of equipment. At the same time, they can buy more time for personnel evacuation and fire rescue in emergency situations such as fire, effectively protecting the safety of life and property and the overall performance of buildings. Under the high-temperature environment requirements of the industrial and construction fields, traditional refractory insulation bricks are mainly fixed by bonding materials such as cement mortar during masonry, and technicians need to spend more time on wall construction to ensure that each brick is accurately positioned and firmly bonded.

[0003] However, with current technology, in a high temperature environment, the cement mortar between bricks will lose its bonding properties due to the high temperature, causing the bricks to loosen. At the same time, the masonry is too complicated, resulting in poor wall integrity and reduced masonry efficiency. Summary of the invention

[0004] In view of the deficiencies in the prior art, the present invention provides refractory heat-insulating bricks with connecting tenons, which solve the problems that bricks are easy to loosen and masonry is too complicated, resulting in poor wall integrity and reduced masonry efficiency.

[0005] To achieve the above objectives, the present invention is implemented through the following technical solutions: a refractory heat-insulating brick with a connecting tenon, comprising a brick body, a filling cavity is opened in the middle of the brick body, a first tenon is fixedly connected to the outer wall of the filling cavity, a connecting groove is opened inside one end of the brick body, the outer wall of the first tenon is arranged on the inner wall of the connecting groove, a second tenon is fixedly connected to the outer wall of the brick body, a limiting groove is opened inside the other end of the brick body, the outer wall of the second tenon is arranged on the inner wall of the limiting groove, positioning tenons are fixedly connected to the outer walls of both sides of the brick body, the positioning tenons are arranged in equal proportions on both sides of the brick body, a card slot is opened inside the brick body, and the outer wall of the positioning tenon is arranged on the inner wall of the card slot.

[0006] Preferably, the method for preparing the refractory heat-insulating brick with a connecting tenon comprises the following steps:

[0007] S1. Material preparation: Select a given mass fraction to prepare the raw materials for making refractory insulation bricks;

[0008] S2, mixing and stirring: firstly placing the material in a stirring device for stirring, then using ultrasonic vibration technology to assist the stirring process, and finally obtaining the green body ingredients;

[0009] S3. Forming of refractory insulation bricks: Through isostatic pressing technology, the ingredients are loaded into an elastic mold, placed in a high-pressure container, and pressure is evenly applied through a liquid medium so that the green body is subjected to the same pressure in all directions and compacted into shape;

[0010] S4, preparation and filling of heat-insulating particles: The heat-insulating particles are prepared by adding glass fiber powder, asbestos fiber, epoxy resin and expanded vermiculite into water according to a certain ratio and stirring, and then feeding the particles into a granulator for extrusion, heating and drying to obtain heat-insulating particles, and then filling the particles into the filling cavity (3) by pouring;

[0011] S5, drying and sintering: placing the formed refractory heat-insulating brick body on a drying rack, passing through a tunnel drying kiln to dry the refractory heat-insulating brick body, and then loading the dried body into a sintering furnace for sintering;

[0012] S6. Surface post-treatment: First, use a compressed air spray gun to blow the refractory insulation bricks to remove impurities on the surface, then use an electric grinder to grind them, and then apply an organic coating to the outer surface of the refractory insulation bricks, and then dry them to obtain refractory insulation bricks.

[0013] Preferably, the raw materials of the refractory insulating bricks in S1 include 25-35 parts of kaolin, 7-10 parts of calcium carbonate, 13-18 parts of perlite, 16-20 parts of aluminum phosphate binder, 5-9 parts of ferric oxide, 13-18 parts of aluminum oxide, 27-36 parts of silicon carbide powder, 4-8 parts of graphite powder and 3-7 parts of rare earth yttrium oxide.

[0014] Preferably, the initial stirring speed of the stirring device in S2 is set to 30-50 rpm, the stirring time is 5-10 minutes, then increased by 20 rpm, and stirring is continued for 10-15 minutes. The vibration frequency of the ultrasonic vibration is set at 20-40kHz, and the power is set at 300-800W.

[0015] Preferably, the liquid medium in S3 is transformer oil or water, the pressure range of the high-pressure container is 100-300 MPa, the pressure rise rate is controlled at 1-2 MPa / second, the pressure holding time is 3-10 minutes, and the subsequent pressure release rate is controlled at 0.5-1 MPa / second.

[0016] Preferably, the solid contents of the heat insulating particles in S4 include 30-50 parts of glass fiber powder, 10-20 parts of asbestos fiber, 20-30 parts of epoxy resin, and 10-20 parts of expanded vermiculite, and the ratio of the solid contents to water is 3:1.

[0017] Preferably, the refractory insulating brick bodies in S5 are placed on the drying rack in a staggered manner, the initial temperature in the tunnel drying kiln is set at 40-60°C, the temperature is gradually increased by 5-10°C / min, the final temperature reaches 100-120°C, and the ventilation speed is controlled at 1-3 m / s.

[0018] Preferably, the organic coating in S6 includes an organic silicon coating, which is applied by a spray gun.

[0019] The present invention provides a refractory heat-insulating brick with a connecting tenon, which has the following beneficial effects:

[0020] 1. The present invention improves the overall performance of the brick body by filling the filling cavity with insulation material, and when in use, the groove at the bottom of the brick body can increase the contact area with the ground concrete and enhance the stability of the wall surface. When mortising, the second tenon on the outer wall of the other brick body is placed in the limiting groove on one side of the brick body for mortise and tenon connection, and the connecting groove slides into the inner wall of the first tenon. When building the wall upward, the card groove of the upper brick body groove is quickly positioned by the positioning tenon, and multiple positioning tenons are flexibly positioned to improve the flexibility of the brick body and the effect of masonry efficiency.

[0021] 2. The present invention uses isostatic pressing technology to evenly transfer pressure to the ingredients in the elastic mold, so that the ingredients are subjected to balanced pressure in all directions. At the same time, the rising rate is controlled to avoid damage to the ingredient structure caused by sudden pressure changes, and the pressure release rate is controlled to prevent internal stress concentration caused by sudden pressure drop from causing cracks and other defects in the brick body, thereby ensuring that the produced refractory and heat-insulating bricks can stably perform their refractory and heat-insulating functions in practical applications.

[0022] 3. The present invention prepares thermal insulation particles by using glass fiber powder, asbestos fiber, epoxy resin and expanded vermiculite in specific proportions and fills them into the filling cavity. The glass fiber powder constructs a thermal insulation network and enhances stability, the asbestos fiber provides toughness, the epoxy resin is bonded, and the expanded vermiculite reduces thermal conductivity. They cooperate with each other to form an efficient thermal insulation layer inside the brick body, which significantly improves the overall thermal insulation effect and enhances structural stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 A three-dimensional diagram of a refractory heat-insulating brick with a connecting tenon according to the present invention;

[0024] Figure 2 It is a schematic diagram of the local structure of the positioning tenon of the refractory heat-insulating brick with the connecting tenon of the present invention;

[0025] Figure 3 It is a schematic diagram of the partial structure of the second tenon of the refractory heat-insulating brick with a connecting tenon of the present invention;

[0026] Figure 4 The present invention is a flow chart of a method for preparing refractory heat-insulating bricks with connecting tenons.

[0027] Among them, 1. brick body; 2. filling cavity; 3. first tenon; 4. connecting groove; 5. second tenon; 6. limiting groove; 7. positioning tenon; 8. clamping groove. DETAILED DESCRIPTION

[0028] The technical solution of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0029] Please see attached Figure 1 - Attachment Figure 3 The embodiment of the present invention provides a refractory heat-insulating brick with a connecting tenon, comprising a brick body 1, a filling cavity 2 is opened in the middle of the brick body 1, a first tenon 3 is fixedly connected to the outer wall of the filling cavity 2, a connecting groove 4 is opened inside one end of the brick body 1, the outer wall of the first tenon 3 is arranged on the inner wall of the connecting groove 4, a second tenon 5 is fixedly connected to the outer wall of the brick body 1, a limiting groove 6 is opened inside the other end of the brick body 1, the outer wall of the second tenon 5 is arranged on the inner wall of the limiting groove 6, positioning tenons 7 are fixedly connected to the outer walls of both sides of the brick body 1, and the positioning tenons 7 are arranged in equal proportion on both sides of the brick body 1, a card slot 8 is opened inside the brick body 1, and the outer wall of the positioning tenon 7 is arranged on the inner wall of the card slot 8.

[0030] Specifically, the filling cavity 2 can be filled with insulation material to improve the overall performance of the brick body 1. When using the refractory insulation brick, the brick body 1 is first placed in a specified position. At this time, the lower groove of the brick body 1 can increase the contact area with the ground concrete and improve the stability of the subsequent wall. At the same time, when performing mortise and tenon joints, the second tenon 5 on the outer wall of another brick body 1 is placed in parallel on the inner wall of the limiting groove 6 on one side of the brick body 1 and mortise and tenoned therewith, and the connecting groove 4 corresponding to one side of the second tenon 5 is synchronously slid to the inner wall of the first tenon 3 for mortise and tenon joint to improve stability. After that, when the brick body 1 is moved upward to build a wall, the slot 8 in the groove of the upper brick body 1 can be positioned by the positioning tenon 7 to ensure the accuracy of the wall building position. At the same time, multiple positioning tenons 7 are parallel, which can flexibly position the wall building position of the upper brick body 1 and improve flexibility and stability.

[0031] Please see attached Figure 4 , a method for preparing a refractory heat-insulating brick with a connecting tenon comprises the following steps:

[0032] S1. Material preparation: Select a given mass fraction to prepare the raw materials for making refractory insulation bricks;

[0033] S2, mixing and stirring: firstly placing the material in a stirring device for stirring, then using ultrasonic vibration technology to assist the stirring process, and finally obtaining the green body ingredients;

[0034] S3. Forming of refractory insulation bricks: Through isostatic pressing technology, the ingredients are loaded into an elastic mold, placed in a high-pressure container, and pressure is evenly applied through a liquid medium so that the green body is subjected to the same pressure in all directions and compacted into shape;

[0035] S4, preparation and filling of heat insulation particles: The heat insulation particles are prepared by adding glass fiber powder, asbestos fiber, epoxy resin and expanded vermiculite into water according to a ratio and stirring, and then sent into a granulator for extrusion, heated and dried to obtain heat insulation particles, and then filled into the filling cavity 3 by perfusion;

[0036] S5, drying and sintering: placing the formed refractory heat-insulating brick body on a drying rack, passing through a tunnel drying kiln to dry the refractory heat-insulating brick body, and then loading the dried body into a sintering furnace for sintering;

[0037] S6. Surface post-treatment: First, use a compressed air spray gun to blow the refractory insulation bricks to remove impurities on the surface, then use an electric grinder to grind them, and then apply an organic coating to the outer surface of the refractory insulation bricks, and then dry them to obtain refractory insulation bricks.

[0038] Specifically, S1 lays the foundation for the performance and quality of refractory insulation bricks by giving raw materials with a given mass fraction, which can ensure the consistency of product performance and improve the product qualification rate;

[0039] The mixing and stirring in S2 can make various raw materials fully and evenly mixed to form a green body batch with uniform texture and stable performance. At the same time, the materials are placed in a mixing device for stirring to initially break the agglomeration state between the raw material particles and make their distribution relatively uniform. The assistance of ultrasonic vibration technology further enhances this effect. It can use the cavitation effect and micro-jet phenomenon generated by high-frequency vibration to more finely disperse nano-scale and other tiny particles, thereby greatly improving the uniformity of the batching, ensuring that in the subsequent molding process, the performance of each part of the brick body 1 is consistent, effectively avoiding structural defects or uneven performance caused by local component differences, and providing a strong guarantee for the production of high-quality refractory insulation bricks;

[0040] In S3, isostatic pressing technology is used to make the green body evenly pressurized in all directions, effectively eliminating air pores in the ingredients, significantly improving the density and compactness of the green body, enhancing its mechanical strength, and making the green body have better compression and bending resistance. At the same time, the accuracy and stability of the green body shape are guaranteed, and defects and deformations in the molding process are reduced, laying a solid foundation for subsequent drying, sintering and other processes, and ultimately helping to produce high-quality, high-performance and precisely dimensioned refractory insulation brick products;

[0041] The glass fiber powder in S4 can form an intricate network inside the thermal insulation particles. When heat passes through these fiber networks, the conduction path becomes tortuous and complex, greatly reducing the heat conduction efficiency, while also enhancing the structural stability of the thermal insulation particles;

[0042] Asbestos fiber has high tensile strength and flexibility. It can form a structure similar to an "elastic skeleton" inside the particles. When the insulation particles are subjected to external impact or thermal stress is generated during temperature changes, the asbestos fiber can absorb and disperse these stresses through its own elastic deformation, thereby effectively preventing the particles from cracking or breaking, and enhancing the impact resistance and thermal shock resistance of the insulation particles.

[0043] Epoxy resin can tightly bond glass fiber powder, asbestos fiber and expanded vermiculite together to form thermal insulation particles with certain strength and stability;

[0044] Expanded vermiculite contains a large number of tiny pores, which are formed during the thermal expansion of vermiculite. They can greatly reduce thermal conductivity. When heat is transferred to expanded vermiculite, the heat will be scattered and reflected at the pores, making it difficult for the heat to be directly transmitted through the vermiculite particles. Together with the thermal insulation properties of glass fiber powder and asbestos fiber, they can significantly improve the overall thermal insulation effect of thermal insulation particles.

[0045] In S5, moisture in the green body is removed by drying, and then the internal material of the green body undergoes physical and chemical changes through sintering, thereby significantly improving the performance and quality of refractory insulation bricks. The drying process uses a tunnel drying kiln to gradually and evenly evaporate moisture, avoiding cracking of the green body due to rapid loss of moisture, ensuring the integrity of the green body structure. At the same time, during sintering, under high temperature, the material particles fuse and crystallize with each other, improving density and strength, enhancing mechanical compression and bending resistance, optimizing the crystal structure and phase composition of the material, greatly improving the refractory performance, enabling it to withstand higher temperatures, while improving thermal insulation performance and reducing heat conduction;

[0046] In S6, the dust, loose particles and other impurities attached to the surface of the brick body 1 during the previous processing can be effectively removed by blowing with a compressed air spray gun, providing a clean surface for subsequent processing, and the electric grinder can eliminate the unevenness, protrusions and burrs on the surface of the brick body 1, making the surface smoother and flatter, ensuring the dimensional accuracy of the brick body 1 and reducing the stress concentration caused by the rough surface during use. After that, the organic coating forms a protective film on the outer surface of the brick body 1 to extend its service life.

[0047] The raw materials of the refractory insulating bricks in S1 include 25-35 parts of kaolin, 7-10 parts of calcium carbonate, 13-18 parts of perlite, 16-20 parts of aluminum phosphate binder, 5-9 parts of ferric oxide, 13-18 parts of aluminum oxide, 27-36 parts of silicon carbide powder, 4-8 parts of graphite powder and 3-7 parts of rare earth yttrium oxide.

[0048] Specifically, kaolin itself is a refractory material with high refractoriness and can maintain a certain stability at high temperatures, providing a basic refractory performance foundation for refractory insulation bricks. At the same time, during the raw material mixing process, it can bond other granular raw materials together, which is helpful for the molding operation, so that the raw materials can be smoothly processed into the shape of the brick body 1 and maintain the integrity of the brick body 1 structure;

[0049] Calcium carbonate decomposes at high temperatures to produce carbon dioxide gas. This process can form some tiny pores inside the brick body 1. These pores can change the density of the brick body 1 and affect the thermal insulation and thermal expansion properties of the brick body 1.

[0050] Perlite is a natural thermal insulation material with a porous structure and a large number of tiny pores inside. These pores can effectively prevent the transfer of heat and play an excellent thermal insulation role by reducing heat conduction and heat convection.

[0051] The aluminum phosphate binder can make the raw material more plastic, so that the raw material can be made into a brick body 1 of a desired shape through a molding technology. After molding, it can maintain the stability of the shape of the brick body 1 and prevent the brick body 1 from being deformed during subsequent processing or use;

[0052] The mechanical properties of the refractory insulation brick can be improved by ferric oxide, which can play a bridging role between particles in the brick body 1. When the brick body 1 is subjected to external force, the ferric oxide particles can connect adjacent raw material particles, transfer and disperse stress, thereby enhancing the compressive and flexural strength of the brick body 1;

[0053] Alumina has a high melting point and good chemical stability, and it can significantly improve the refractory strength of the refractory insulation brick, so that the brick body 1 maintains stable physical and chemical properties in a high temperature environment, and at the same time makes the brick body 1 stronger;

[0054] Silicon carbide powder, with its high melting point, gives the brick body 1 excellent fire resistance and is an important line of defense against high temperatures. At the same time, its relatively high thermal conductivity enables the brick body 1 to effectively conduct heat while insulating, avoiding local overheating, and its high hardness enhances the wear resistance of the brick body 1;

[0055] Graphite powder has both heat insulation and lubrication properties, effectively preventing heat transfer in the brick body 1, while reducing friction between raw material particles during molding, promoting mixing and molding. In addition, its chemical stability can resist chemical corrosion, and its special conductivity has unique uses in specific environments;

[0056] Yttrium oxide combines with other metal oxides to form a stable structure, improves the high temperature resistance of the brick body 1, inhibits grain growth and makes the internal structure more uniform and dense. At the same time, it can adjust the elastic modulus and thermal expansion coefficient of the material, relieve thermal stress and improve toughness, and in a chemical environment, it can form a protective film on the surface of the brick body 1, thereby significantly extending the service life of the refractory insulation brick and maintaining stable performance.

[0057] The initial stirring speed of the stirring device in S2 is set to 30-50 rpm, the stirring time is 5-10 minutes, then increased by 20 rpm, and stirring is continued for 10-15 minutes. The vibration frequency of the ultrasonic vibration is set at 20-40kHz, and the power is set at 300-800W.

[0058] Specifically, the stirring equipment initially stirs at a relatively low speed, which can make the raw materials initially mixed evenly under relatively mild conditions, avoiding the flying of raw materials or incomplete agglomeration and dispersion caused by the start of high-speed stirring. As the stirring time advances and the speed is gradually increased, the mixing effect can be further enhanced, so that raw materials of different particle sizes and different properties can be fully contacted and dispersed. The ultrasonic vibration technology acts at a specific frequency and power, and the cavitation effect it produces can effectively break up the agglomerates between raw material particles at the microscopic level, promote the uniform dispersion of tiny particles, such as nano-level ferric oxide, etc., so that the uniformity of the blank ingredients is greatly improved, thereby ensuring that in the subsequent molding process, the performance of each part of the brick body 1 is consistent, effectively avoiding structural defects or uneven performance caused by local component differences, and laying a solid foundation for the production of high-quality refractory insulation bricks.

[0059] The liquid medium in S3 is transformer oil or water, the pressure range of the high-pressure container is 100-300MPa, the pressure rise rate is controlled at 1-2MPa / second, the pressure holding time is 3 to 10 minutes, and the subsequent pressure release rate is controlled at 0.5-1MPa / second.

[0060] Specifically, variable pressure oil or water is selected as the liquid medium and isostatic pressing is performed under specific pressure parameters. The liquid medium can evenly transmit the pressure to the ingredients in the elastic mold, so that the ingredients are subjected to balanced pressure in all directions within the high pressure range of 100-300MPa. The control of the pressure rise rate can avoid the damage to the ingredient structure caused by the sudden change of pressure, discharge the internal air pores, and improve the density and strength. The regulation of the pressure release rate prevents the internal stress concentration caused by the sudden drop in pressure from causing defects such as cracks in the brick body 1, and finally ensures that the formed refractory and heat-insulating brick body has a compact structure, regular shape and excellent performance, providing a high-quality body foundation for subsequent drying, sintering and other processes, and ensuring that the produced refractory and heat-insulating bricks can stably perform their refractory and heat-insulating functions in practical applications.

[0061] The solid content of the thermal insulation particles in S4 includes 30-50 parts of glass fiber powder, 10-20 parts of asbestos fiber, 20-30 parts of epoxy resin, and 10-20 parts of expanded vermiculite, and the ratio of solid content to water is 3:1.

[0062] Specifically, the heat-insulating particle components, glass fiber powder, asbestos fiber, epoxy resin and expanded vermiculite cooperate with each other according to a specific ratio.

[0063] In S5, the refractory insulation brick bodies are placed on the drying rack in a staggered arrangement. The initial temperature in the tunnel drying kiln is set at 40-60℃, and the temperature is gradually increased by 5-10℃ / minute, and the final temperature reaches 100-120℃. The ventilation speed is controlled at 1-3 m / s.

[0064] Specifically, staggering the refractory insulation brick bodies on the drying rack can make the ventilation between the bodies more uniform and avoid drying differences caused by local poor airflow. The tunnel drying kiln uses an initial temperature of 40-60°C, which can gently start the drying process and prevent the body from losing water and cracking quickly on the surface due to excessively high initial temperature. The temperature is then raised to 100-120°C at a rate of 5-10°C / minute, which ensures that moisture can continue to stably migrate from the inside of the body to the surface and evaporate, and gives the body time to adapt to temperature changes, making the drying more thorough and uniform.

[0065] The organic coating in S6 includes a silicone coating, which is applied by a spray gun.

[0066] Specifically, a silicone coating is used and applied by a spray gun. The silicone coating itself has excellent high temperature resistance and can remain stable in a high temperature environment, effectively protecting the refractory insulation brick substrate and preventing its performance from deteriorating due to high temperature. At the same time, the spray gun coating method can make the coating evenly cover the outer surface of the brick body 1 to form a continuous and dense protective film, further improving the thermal insulation performance of the brick body 1 and reducing heat loss.

[0067] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A refractory heat-insulating brick with a connecting tenon, comprising a brick body (1), characterized in that: A filling cavity (2) is provided in the middle of the brick body (1), and a first tenon (3) is fixedly connected to the outer wall of the filling cavity (2). A connecting groove (4) is provided inside one end of the brick body (1), and the outer wall of the first tenon (3) is arranged on the inner wall of the connecting groove (4). A second tenon (5) is fixedly connected to the outer wall of the brick body (1). A limiting groove (6) is provided inside the other end of the brick body (1), and the outer wall of the second tenon (5) is arranged on the inner wall of the limiting groove (6). Positioning tenons (7) are fixedly connected to the outer walls of both sides of the brick body (1), and the positioning tenons (7) are arranged in equal proportions on both sides of the brick body (1). A clamping groove (8) is provided inside the brick body (1), and the outer wall of the positioning tenon (7) is arranged on the inner wall of the clamping groove (8).

2. A method for preparing a refractory heat-insulating brick with a connection tenon, the refractory heat-insulating brick with a connection tenon according to claim 1, characterized in that: The following steps are involved: S1. Material preparation: Select a given mass fraction to prepare the raw materials for making refractory insulation bricks; S2, mixing and stirring: firstly placing the material in a stirring device for stirring, then using ultrasonic vibration technology to assist the stirring process, and finally obtaining the green body ingredients; S3. Forming of refractory insulation bricks: Through isostatic pressing technology, the ingredients are loaded into an elastic mold, placed in a high-pressure container, and pressure is evenly applied through a liquid medium so that the green body is subjected to the same pressure in all directions and compacted into shape; S4, preparation and filling of heat-insulating particles: The heat-insulating particles are prepared by adding glass fiber powder, asbestos fiber, epoxy resin and expanded vermiculite into water according to a certain ratio and stirring, and then feeding the particles into a granulator for extrusion, heating and drying to obtain heat-insulating particles, and then filling the particles into the filling cavity (3) by pouring; S5, drying and sintering: placing the formed refractory heat-insulating brick body on a drying rack, passing through a tunnel drying kiln to dry the refractory heat-insulating brick body, and then loading the dried body into a sintering furnace for sintering; S6. Surface post-treatment: First, use a compressed air spray gun to blow the refractory insulation bricks to remove impurities on the surface, then use an electric grinder to grind them, and then apply an organic coating to the outer surface of the refractory insulation bricks, and then dry them to obtain refractory insulation bricks.

3. The method for preparing the refractory heat-insulating brick with a connecting tenon according to claim 2, characterized in that: The raw materials of the refractory insulating bricks in S1 include 25-35 parts of kaolin, 7-10 parts of calcium carbonate, 13-18 parts of perlite, 16-20 parts of aluminum phosphate binder, 5-9 parts of ferric oxide, 13-18 parts of aluminum oxide, 27-36 parts of silicon carbide powder, 4-8 parts of graphite powder and 3-7 parts of rare earth yttrium oxide.

4. The method for preparing the refractory heat-insulating brick with a connecting tenon according to claim 2, characterized in that: The initial stirring speed of the stirring device in S2 is set to 30-50 rpm, the stirring time is 5-10 minutes, then increased by 20 rpm, and stirring is continued for 10-15 minutes. The vibration frequency of the ultrasonic vibration is set at 20-40kHz, and the power is set at 300-800W.

5. The method for preparing the refractory heat-insulating brick with a connecting tenon according to claim 2, characterized in that: The liquid medium in S3 is transformer oil or water, the pressure range of the high-pressure container is 100-300MPa, the pressure rise rate is controlled at 1-2MPa / second, the pressure holding time is 3-10 minutes, and the subsequent pressure release rate is controlled at 0.5-1MPa / second.

6. The method for preparing the refractory heat-insulating brick with a connecting tenon according to claim 2, characterized in that: The solid content of the heat insulating particles in S4 includes 30-50 parts of glass fiber powder, 10-20 parts of asbestos fiber, 20-30 parts of epoxy resin, and 10-20 parts of expanded vermiculite, and the ratio of the solid content to water is 3:

1.

7. The method for preparing the refractory heat-insulating brick with a connecting tenon according to claim 2, characterized in that: The refractory insulation brick bodies in S5 are placed on the drying rack in a staggered arrangement. The initial temperature of the tunnel drying kiln is set at 40-60°C, and the temperature is gradually increased by 5-10°C / min, and the final temperature reaches 100-120°C. The ventilation speed is controlled at 1-3 m / s.

8. The method for preparing the refractory heat-insulating brick with a connecting tenon according to claim 2, characterized in that: The organic coating in S6 includes an organic silicon coating, which is applied by a spray gun.

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