Method for preparing boron carbide powder based on induction heating of rotary kiln

Abstract

The invention relates to a method for preparing boron carbide powder based on induction heating of a rotary kiln, which can effectively solve the problems of complex preparation process, low production efficiency, high energy consumption and incapability of large-scale production in the prior art. The method comprises the following steps: firstly, constructing a rotary kiln induction heating device, then, after burdening, crushing and mixing, charging and heating, rotating a kiln body, sufficiently turning over materials to reduce the phenomena of local overheating and incomplete burning of the materials, continuously heating to obtain a boron carbide material, and taking out the boron carbide material after cooling; according to the present invention, the structure is novel and unique, the operation and the use are convenient and flexible, the production efficiency is high, the energy consumption is low, the industrial production is easy, and the practical promotion and application value is provided.

Description

Technical Field

[0001] This invention relates to the field of materials preparation, and in particular to a method for preparing boron carbide powder based on rotary kiln induction heating. Background Technology

[0002] Boron carbide (B4C), also known as black diamond, possesses a high melting point, high strength, low density, a large neutron trapping surface, and excellent thermal, electrical, and chemical resistance properties. It is the hardest substance after diamond and cubic boron nitride, and therefore widely used in various industrial fields such as mechanical grinding, refractory materials, engineering ceramics, nuclear industry, and military applications. The main methods for preparing B4C include direct elemental synthesis, carbothermal reduction synthesis, self-propagating high-temperature synthesis (using magnesium as an initiator), chemical vapor deposition (CVD), sol-gel method, mechanical alloying method, and precursor pyrolysis method. Currently, the industrial-scale preparation of boron carbide mainly adopts the carbothermic reduction method in an AC electric arc furnace. Boric acid or boric anhydride is usually used as raw material and carbon as reducing agent. In an AC electric arc furnace, three-phase AC power is used to carry out a high-temperature reduction reaction through the conductive heat transfer of graphite electrodes. The chemical reaction equations in the process are: 2B2O3+7C=B4C+6CO; 4H3BO3+7C=B4C+6CO+6H2O. The carbothermic reduction method for preparing boron carbide using an AC electric arc furnace has the advantages of simple equipment structure, small footprint, and rapid construction. However, this process has the following drawbacks: 1. The smelting temperature and process are uncontrollable, resulting in significant heat loss, large temperature differences within the furnace, and high energy consumption (approximately 27,500-28,500 kWh per ton of boron carbide crystals); 2. The smelting process generates a large amount of dust and causes severe pollution, leading to a harsh production environment and low product purity; 3. The boron carbide product is taken out from the top of the furnace, resulting in long processing time and significant heat loss. Therefore, it is necessary to research and develop a more energy-efficient, environmentally friendly, and scalable boron carbide production technology.

[0003] Currently, there have been some studies on methods for preparing boron carbide, such as "A method for preparing ultrafine boron carbide powder" (CN107758670A), which involves mixing a boron source and a carbon source to obtain smelting raw materials, placing the raw materials in a smelting furnace, applying a voltage, and holding at 1500~1900 ℃ for 24~48 minutes. While the method of obtaining ultrafine boron carbide powder has its advantages, it suffers from high energy consumption. The invention described in "A Boron Carbide Smelting Apparatus and a Method for Preparing Boron Carbide" (CN107954718A) proposes a novel boron carbide smelting apparatus. This apparatus uses a near-closed high-temperature treatment method to prepare boron carbide, reducing impurity element contamination and producing products with good crystallinity and high purity. However, it primarily employs electric arc smelting, resulting in high energy consumption and production costs. The invention described in "A Method for Preparing Fine Boron Carbide Powder" (CN114105144A) involves mixing boric acid, graphite powder, deionized water, and a dispersant in a reaction vessel, followed by two heat treatments to obtain fine boron carbide powder. While this method has its advantages, the preparation process is complex, production efficiency is low, and it cannot be scaled up for mass production. The invention described in "A Method for Producing Boron Carbide Crystal Blocks in an Resistance Furnace" (CN106747452A) involves pressing boric acid and a carbon reducing agent with water into pellets, then heating them in an resistance furnace to 1900-2500℃ and smelting for 20-48 hours. While obtaining boron carbide ingots after a certain period of time has its advantages, the smelting temperature is high, the time is long, and the energy consumption of the process remains high. Therefore, improving and innovating the preparation method of boron carbide powder is a technical problem that needs to be seriously addressed. Summary of the Invention

[0004] In view of the above situation and to overcome the shortcomings of the prior art, the purpose of this invention is to provide a method for preparing boron carbide powder based on rotary kiln induction heating, which can effectively solve the problems of complex preparation process, low production efficiency, high energy consumption and inability to scale up production.

[0005] The technical solution provided by this invention is: a method for preparing boron carbide powder based on rotary kiln induction heating. First, a rotary kiln induction heating device is constructed, and then the following steps are performed: S1. Ingredients: Weigh out the boron source material and carbon source material respectively according to a mass ratio of 3~5:1. The boron source material is boron oxide (B2O3), boric acid (H3BO3) or a combination of two of them in any mass ratio. The carbon source material is at least one of coke, activated carbon, petroleum coke and graphite. S2. Grinding and mixing: Grind and mix the weighed boron source material and carbon source material evenly to obtain fine raw materials; S3. Charging: After the raw materials are charged into the cylinder through the kiln head feeding device, the heating device uses the principle of electromagnetic induction to make the graphite heating element in the furnace self-heat and directly heat the material. The material is self-heated after the temperature rises to 1000°. S4. Heating: The heat output of the graphite heating element is adjusted by the electromagnetic heating control cabinet, so that the material can be independently controlled in different areas and stages, and the temperature is gradually increased. S5. Rotating kiln body: The kiln body rotates 360°, ensuring even heating and thorough material agitation. This reduces localized overheating and incomplete burning, thus improving product quality. S6. Heating: Heat the raw material to 2000~2300 ℃ to obtain boron carbide material; S7. Cooling: The generated boron carbide material is taken out after being cooled in the kiln tail cooling chamber; S8. Finished Powder: The generated boron carbide material is crushed and ground, washed with water 2-3 times and filtered to remove residual impurities in the powder, and then graded and dried to obtain the finished boron carbide powder.

[0006] This invention has a novel and unique structure, is easy and flexible to operate, has high production efficiency, low energy consumption, is easy to industrialize, and has practical application value. Attached Figure Description

[0007] Figure 1 This is a process flow diagram of the present invention; Figure 2 This is a structural diagram of the rotary kiln induction heating device of the present invention; Figure 3 For the present invention Figure 2 Sectional view of A1-A2; Figure 4 A partial anatomical diagram of the kiln structure of the present invention: The components are as follows: 1. Kiln body, 1a. Outer wall layer, 1b. Electromagnetic coil, 1c. Graphite heating layer, 1d. Inner wall layer, 1e. Spiral blades, 2. Feed hopper, 3. Automatic weighing device, 4. Cooling hopper, 5. Dust collector, 6. Support wheel, 7. Transmission device (transmission gear), 8. Pulley, 8a. Pulley support, 9a. First support seat, 9b. Second support seat, 10. Motor, 11. Drive gear, 11a. Gear support. Detailed Implementation

[0008] The specific implementation of the present invention will be described in detail below with reference to examples and specific circumstances.

[0009] The present invention can be described by the following embodiments: Example

[0010] The technical solution provided by this invention is: a method for preparing boron carbide powder based on rotary kiln induction heating. First, a rotary kiln induction heating device is constructed, and then the following steps are performed: S1. Ingredients: Weigh out the boron source material and the carbon source material in a mass ratio of 3:1. The boron source material is boron oxide (B2O3), and the carbon source material is coke. S2. Grinding and mixing: Grind and mix the weighed boron source material and carbon source material evenly to obtain fine raw materials; S3. Charging: After the raw materials are charged into the cylinder through the kiln head feeding device, the heating device uses the principle of electromagnetic induction to make the graphite heating element in the furnace self-heat and directly heat the material. The material is self-heated after the temperature rises to 1000°. S4. Heating: The heat output of the graphite heating element is adjusted by the electromagnetic heating control cabinet, so that the material can be independently controlled in different areas and stages, and the temperature is gradually increased. S5. Rotating kiln body: The kiln body rotates 360°, ensuring even heating and thorough material agitation. This reduces localized overheating and incomplete burning, thus improving product quality. S6. Heating: The raw material is heated to 2100℃ to obtain boron carbide material; S7. Cooling: The generated boron carbide material is taken out after being cooled in the kiln tail cooling chamber; S8. Finished Powder: The generated boron carbide material is crushed and ground, washed twice with water and filtered to remove residual impurities in the powder, and then graded and dried to obtain the finished boron carbide powder. Example

[0011] The technical solution provided by this invention is: a method for preparing boron carbide powder based on rotary kiln induction heating. First, a rotary kiln induction heating device is constructed, and then the following steps are performed: S1. Ingredients: Weigh out the boron source material and the carbon source material in a mass ratio of 4:1. The boron source material is boric acid (H3BO3), and the carbon source material is activated carbon. S2. Grinding and mixing: Grind and mix the weighed boron source material and carbon source material evenly to obtain fine raw materials; S3. Charging: After the raw materials are charged into the cylinder through the kiln head feeding device, the heating device uses the principle of electromagnetic induction to make the graphite heating element in the furnace self-heat and directly heat the material. The material is self-heated after the temperature rises to 1000°. S4. Heating: The heat output of the graphite heating element is adjusted by the electromagnetic heating control cabinet, so that the material can be independently controlled in different areas and stages, and the temperature is gradually increased. S5. Rotating kiln body: The kiln body rotates 360°, ensuring even heating and thorough material agitation. This reduces localized overheating and incomplete burning, thus improving product quality. S6. Heating: The raw material is heated to 2200℃ to obtain boron carbide material; S7. Cooling: The generated boron carbide material is taken out after being cooled in the kiln tail cooling chamber; S8. Finished Powder: The generated boron carbide material is crushed and ground, washed with water three times and filtered to remove residual impurities in the powder, and then graded and dried to obtain the finished boron carbide powder. Example

[0012] The technical solution provided by this invention is: a method for preparing boron carbide powder based on rotary kiln induction heating. First, a rotary kiln induction heating device is constructed, and then the following steps are performed: S1. Ingredients: Weigh out the boron source material and the carbon source material in a mass ratio of 5:1. The boron source material is a 1:1 mass composition of boron oxide (B2O3) and boric acid (H3BO3), and the carbon source material is a 1:1 mass composition of coke and activated carbon. S2. Grinding and mixing: Grind and mix the weighed boron source material and carbon source material evenly to obtain fine raw materials; S3. Charging: After the raw materials are charged into the cylinder through the kiln head feeding device, the heating device uses the principle of electromagnetic induction to make the graphite heating element in the furnace self-heat and directly heat the material. The material is self-heated after the temperature rises to 1000°. S4. Heating: The heat output of the graphite heating element is adjusted by the electromagnetic heating control cabinet, so that the material can be independently controlled in different areas and stages, and the temperature is gradually increased. S5. Rotating kiln body: The kiln body rotates 360°, ensuring even heating and thorough material agitation. This reduces localized overheating and incomplete burning, thus improving product quality. S6. Heating: The raw material is heated to 2150℃ to obtain boron carbide material; S7. Cooling: The generated boron carbide material is taken out after being cooled in the kiln tail cooling chamber; S8. Finished Powder: The generated boron carbide material is crushed and ground, washed with water three times and filtered to remove residual impurities in the powder, and then graded and dried to obtain the finished boron carbide powder. Example

[0013] The technical solution provided by this invention is: a method for preparing boron carbide powder based on rotary kiln induction heating. First, a rotary kiln induction heating device is constructed, and then the following steps are performed: S1. Ingredients: Weigh out the boron source material and carbon source material in a mass ratio of 4:1. The boron source material is boron oxide (B2O3) or boric acid (H3BO3), and the carbon source material is a mixture of petroleum coke and graphite in a mass ratio of 1:1. S2. Grinding and mixing: Grind and mix the weighed boron source material and carbon source material evenly to obtain fine raw materials; S3. Charging: After the raw materials are charged into the cylinder through the kiln head feeding device, the heating device uses the principle of electromagnetic induction to make the graphite heating element in the furnace self-heat and directly heat the material. The material is self-heated after the temperature rises to 1000°. S4. Heating: The heat output of the graphite heating element is adjusted by the electromagnetic heating control cabinet, so that the material can be independently controlled in different areas and stages, and the temperature is gradually increased. S5. Rotating kiln body: The kiln body rotates 360°, ensuring even heating and thorough material agitation. This reduces localized overheating and incomplete burning, thus improving product quality. S6. Heating: The raw material is heated to 2250℃ to obtain boron carbide material; S7. Cooling: The generated boron carbide material is taken out after being cooled in the kiln tail cooling chamber; S8. Finished Powder: The generated boron carbide material is crushed and ground, washed twice with water and filtered to remove residual impurities in the powder, and then graded and dried to obtain the finished boron carbide powder. Example

[0014] The technical solution provided by this invention is: a method for preparing boron carbide powder based on rotary kiln induction heating. First, a rotary kiln induction heating device is constructed, and then the following steps are performed: S1. Ingredients: Weigh out the boron source material and carbon source material in a mass ratio of 3.5:1. The boron source material is a 1:2 mass mixture of boron oxide (B2O3) and boric acid (H3BO3), and the carbon source material is a 1:1:1:1 mass mixture of coke, activated carbon, petroleum coke and graphite. S2. Grinding and mixing: Grind and mix the weighed boron source material and carbon source material evenly to obtain fine raw materials; S3. Charging: After the raw materials are charged into the cylinder through the kiln head feeding device, the heating device uses the principle of electromagnetic induction to make the graphite heating element in the furnace self-heat and directly heat the material. The material is self-heated after the temperature rises to 1000°. S4. Heating: The heat output of the graphite heating element is adjusted by the electromagnetic heating control cabinet, so that the material can be independently controlled in different areas and stages, and the temperature is gradually increased. S5. Rotating kiln body: The kiln body rotates 360°, ensuring even heating and thorough material agitation. This reduces localized overheating and incomplete burning, thus improving product quality. S6. Heating: The raw material is heated to 2050℃ to obtain boron carbide material; S7. Cooling: The generated boron carbide material is taken out after being cooled in the kiln tail cooling chamber; S8. Finished Powder: The generated boron carbide material is crushed and ground, washed with water three times and filtered to remove residual impurities in the powder, and then graded and dried to obtain the finished boron carbide powder.

[0015] The above embodiments are all based on the production and preparation of a rotary kiln induction heating device, which is composed of... Figure 2The structure is as follows: A kiln body 1 is provided. An automatic weighing device 3 is installed at the feed end (left end) of the kiln body 1. A feed bin 2 is located above the weighing device. A cooling bin 4 is installed at the discharge port on the right end of the kiln body 1. A dust collector 5 is installed at the dust removal outlet above the cooling bin 4. A transmission gear 7 is installed on the outer wall of the middle section of the kiln body 1. Symmetrical support wheels 6 are installed on the outer walls of both ends of the kiln body 1. The support wheels 6 are placed on pulleys 8. The pulleys 8 are mounted on pulley support seats 8a via axles. The pulley support seats 8a are mounted on first support seats 9a. The transmission gear 7... The drive gear 11 meshes with the drive gear 11, which is mounted on the gear support 11a via a rotating shaft. The gear support 11a is mounted on the second support 9b. The rotating shaft of the drive gear 11 is connected to the transmission shaft of the motor 10 mounted on the second support 9b via a coupling, thus forming the rotating structure of the kiln body. The kiln body 1 is composed of an outer wall layer 1a, an electromagnetic coil 1b, a graphite heating layer 1c, and an inner wall layer 1d, arranged sequentially from the outside to the inside. Several evenly distributed spiral blades 1e are mounted on the inner wall layer 1d, forming a tumbling and propulsion structure for the material.

[0016] The graphite heating layer 1c is an antioxidant coated graphite material with high purity, high density, and high strength, which is inlaid on the inner wall of the kiln.

[0017] An electromagnetic heating control cabinet is provided outside the kiln body 1 to control the heating of the electromagnetic coil. The alternating magnetic field is generated by the high-frequency current to heat the graphite heating element (not shown in the figure, known technology).

[0018] The cooling chamber 4 is located at the discharge port (tail end) of the kiln body and has the dual functions of material storage and rapid cooling.

[0019] The cooling chamber 4 is connected to the dust collector 5 to achieve negative pressure exhaust, collect boron gangue, and clean production.

[0020] The outer wall of the rotary kiln is covered with aluminum-based, zirconium-based, or composite ultra-high temperature insulation material, and the electromagnetic induction coil is wound around the ultra-high temperature insulation material.

[0021] In summary, this invention prepares boron carbide using electromagnetic heating within a sealed rotary kiln. Furthermore, by adjusting the heat output of the graphite heating element through an electromagnetic heating control cabinet, the material is subjected to independent temperature control in different zones and stages, gradually increasing the temperature to precisely control the crystallization process and production process of boron carbide. The generated boron carbide material is cooled in the kiln tail cooling chamber before being removed. This method offers advantages such as simple process, rapid heating, high thermal efficiency, and scalability. The resulting product exhibits high purity, good crystallinity, uniform particle size, and stable and controllable quality, meeting the quality requirements for boron carbide powder in the engineering ceramics field. Compared with existing technologies, it has the following beneficial technical effects: Using boron anhydride or boric acid as the boron source and coke, activated carbon, petroleum coke, or graphite as the carbon source can reduce production costs; the anti-oxidation coating of the high-performance graphite heating element prevents high-temperature oxidation of graphite and stabilizes its excellent heating performance, providing a reliable and controllable reaction temperature for the reaction field; the kiln body rotates 360°, ensuring uniform heating and thorough material agitation, resulting in rapid material heating and uniform temperature; the outer wall of the rotary kiln is covered with aluminum-based, zirconium-based, or composite ultra-high temperature insulation materials to avoid heat loss and improve heat utilization efficiency; during the electromagnetic induction heating process, the material's self-heating... Induction heating saves energy; electromagnetic heating allows for independent temperature control of materials in different zones and stages, gradually increasing the temperature to precisely control the crystallization process of boron carbide, resulting in a complete boron carbide structure, reduced defects, and improved purity and crystallinity of the product; the negative pressure exhaust and dust removal device prevents oxidation of raw materials at high temperatures, improving raw material utilization, and the volatilized B2O3 can be recycled, saving energy and protecting the environment; the cooling chamber's storage and cooling functions facilitate the removal of boron carbide products, enabling continuous production. This is a major innovation in boron carbide material preparation and has practical application value.

Claims

1. A method for preparing boron carbide powder based on rotary kiln induction heating, comprising first constructing a rotary kiln induction heating device, and then implementing the method through the following steps: S1. Ingredients: Weigh out the boron source material and carbon source material respectively according to a mass ratio of 3~5:

1. The boron source material is boron oxide (B2O3), boric acid (H3BO3) or a combination of two of them in any mass ratio. The carbon source material is at least one of coke, activated carbon, petroleum coke and graphite. S2. Grinding and mixing: Grind and mix the weighed boron source material and carbon source material evenly to obtain fine raw materials; S3. Charging: After the raw materials are charged into the cylinder through the kiln head feeding device, the heating device uses the principle of electromagnetic induction to make the graphite heating element in the furnace self-heat and directly heat the material. The material is self-heated after the temperature rises to 1000°. S4. Heating: The heat output of the graphite heating element is adjusted by the electromagnetic heating control cabinet, so that the material can be independently controlled in different areas and stages, and the temperature is gradually increased. S5. Rotating kiln body: The kiln body rotates 360°, ensuring even heating and thorough material agitation. This reduces localized overheating and incomplete burning, thus improving product quality. S6. Heating: Heat the raw material to 2000~2300 ℃ to obtain boron carbide material; S7. Cooling: The generated boron carbide material is taken out after being cooled in the kiln tail cooling chamber; S8. Finished Powder: The generated boron carbide material is crushed and ground, washed with water 2-3 times and filtered to remove residual impurities in the powder, and then graded and dried to obtain the finished boron carbide powder.

2. The method for preparing boron carbide powder based on rotary kiln induction heating according to claim 1, characterized in that, The steps are: S1. Ingredients: Weigh out the boron source material and the carbon source material according to a mass ratio of 3:

1. The boron source material is boron oxide (B2O3), and the carbon source material is coke. S2. Grinding and mixing: Grind and mix the weighed boron source material and carbon source material evenly to obtain fine raw materials; S3. Charging: After the raw materials are charged into the cylinder through the kiln head feeding device, the heating device uses the principle of electromagnetic induction to make the graphite heating element in the furnace self-heat and directly heat the material. The material is self-heated after the temperature rises to 1000°. S4. Heating: The heat output of the graphite heating element is adjusted by the electromagnetic heating control cabinet, so that the material can be independently controlled in different areas and stages, and the temperature is gradually increased. S5. Rotating kiln body: The kiln body rotates 360°, ensuring even heating and thorough material agitation. This reduces localized overheating and incomplete burning, thus improving product quality. S6. Heating: The raw material is heated to 2100℃ to obtain boron carbide material; S7. Cooling: The generated boron carbide material is taken out after being cooled in the kiln tail cooling chamber; S8. Finished Powder: The generated boron carbide material is crushed and ground, washed twice with water and filtered to remove residual impurities in the powder, and then graded and dried to obtain the finished boron carbide powder.

3. The method for preparing boron carbide powder based on rotary kiln induction heating according to claim 1, characterized in that, The steps are: S1. Ingredients: Weigh out the boron source material and the carbon source material according to a mass ratio of 4:

1. The boron source material is boric acid (H3BO3), and the carbon source material is activated carbon. S2. Grinding and mixing: Grind and mix the weighed boron source material and carbon source material evenly to obtain fine raw materials; S3. Charging: After the raw materials are charged into the cylinder through the kiln head feeding device, the heating device uses the principle of electromagnetic induction to make the graphite heating element in the furnace self-heat and directly heat the material. The material is self-heated after the temperature rises to 1000°. S4. Heating: The heat output of the graphite heating element is adjusted by the electromagnetic heating control cabinet, so that the material can be independently controlled in different areas and stages, and the temperature is gradually increased. S5. Rotating kiln body: The kiln body rotates 360°, ensuring even heating and thorough material agitation. This reduces localized overheating and incomplete burning, thus improving product quality. S6. Heating: The raw material is heated to 2200℃ to obtain boron carbide material; S7. Cooling: The generated boron carbide material is taken out after being cooled in the kiln tail cooling chamber; S8. Finished Powder: The generated boron carbide material is crushed and ground, washed with water three times and filtered to remove residual impurities in the powder, and then graded and dried to obtain the finished boron carbide powder.

4. The method for preparing boron carbide powder based on rotary kiln induction heating according to claim 1, characterized in that, The steps are: S1. Ingredients: Weigh out the boron source material and the carbon source material in a mass ratio of 5:

1. The boron source material is a 1:1 mass composition of boron oxide (B2O3) and boric acid (H3BO3), and the carbon source material is a 1:1 mass composition of coke and activated carbon. S2. Grinding and mixing: Grind and mix the weighed boron source material and carbon source material evenly to obtain fine raw materials; S3. Charging: After the raw materials are charged into the cylinder through the kiln head feeding device, the heating device uses the principle of electromagnetic induction to make the graphite heating element in the furnace self-heat and directly heat the material. The material is self-heated after the temperature rises to 1000°. S4. Heating: The heat output of the graphite heating element is adjusted by the electromagnetic heating control cabinet, so that the material can be independently controlled in different areas and stages, and the temperature is gradually increased. S5. Rotating kiln body: The kiln body rotates 360°, ensuring even heating and thorough material agitation. This reduces localized overheating and incomplete burning, thus improving product quality. S6. Heating: The raw material is heated to 2150℃ to obtain boron carbide material; S7. Cooling: The generated boron carbide material is taken out after being cooled in the kiln tail cooling chamber; S8. Finished Powder: The generated boron carbide material is crushed and ground, washed with water three times and filtered to remove residual impurities in the powder, and then graded and dried to obtain the finished boron carbide powder.

5. The method for preparing boron carbide powder based on rotary kiln induction heating according to claim 1, characterized in that, The steps are: S1. Ingredients: Weigh out the boron source material and carbon source material in a mass ratio of 4:

1. The boron source material is boron oxide (B2O3) or boric acid (H3BO3), and the carbon source material is a mixture of petroleum coke and graphite in a mass ratio of 1:

1. S2. Grinding and mixing: Grind and mix the weighed boron source material and carbon source material evenly to obtain fine raw materials; S3. Charging: After the raw materials are charged into the cylinder through the kiln head feeding device, the heating device uses the principle of electromagnetic induction to make the graphite heating element in the furnace self-heat and directly heat the material. The material is self-heated after the temperature rises to 1000°. S4. Heating: The heat output of the graphite heating element is adjusted by the electromagnetic heating control cabinet, so that the material can be independently controlled in different areas and stages, and the temperature is gradually increased. S5. Rotating kiln body: The kiln body rotates 360°, ensuring even heating and thorough material agitation. This reduces localized overheating and incomplete burning, thus improving product quality. S6. Heating: The raw material is heated to 2250℃ to obtain boron carbide material; S7. Cooling: The generated boron carbide material is taken out after being cooled in the kiln tail cooling chamber; S8. Finished Powder: The generated boron carbide material is crushed and ground, washed twice with water and filtered to remove residual impurities in the powder, and then graded and dried to obtain the finished boron carbide powder.

6. The method for preparing boron carbide powder based on rotary kiln induction heating according to claim 1, characterized in that, The steps are: S1. Ingredients: Weigh out the boron source material and carbon source material respectively according to a mass ratio of 3.5:

1. The boron source material is a mixture of boron oxide (B2O3) and boric acid (H3BO3) in a mass ratio of 1:

2. The carbon source material is a mixture of coke, activated carbon, petroleum coke and graphite in a mass ratio of 1:1:1:

1. S2. Grinding and mixing: Grind and mix the weighed boron source material and carbon source material evenly to obtain fine raw materials; S3. Charging: After the raw materials are charged into the cylinder through the kiln head feeding device, the heating device uses the principle of electromagnetic induction to make the graphite heating element in the furnace self-heat and directly heat the material. The material is self-heated after the temperature rises to 1000°. S4. Heating: The heat output of the graphite heating element is adjusted by the electromagnetic heating control cabinet, so that the material can be independently controlled in different areas and stages, and the temperature is gradually increased. S5. Rotating kiln body: The kiln body rotates 360°, ensuring even heating and thorough material agitation. This reduces localized overheating and incomplete burning, thus improving product quality. S6. Heating: The raw material is heated to 2050℃ to obtain boron carbide material; S7. Cooling: The generated boron carbide material is taken out after being cooled in the kiln tail cooling chamber; S8. Finished Powder: The generated boron carbide material is crushed and ground, washed with water three times and filtered to remove residual impurities in the powder, and then graded and dried to obtain the finished boron carbide powder.

7. The method for preparing boron carbide powder based on rotary kiln induction heating according to claim 1 or 2-6, characterized in that, The rotary kiln induction heating device structure includes a kiln body (1), an automatic weighing device (3) at the feed end of the kiln body (1), a feed bin (2) above the weighing device, a cooling bin (4) at the right end of the kiln body (1), a dust collector (5) at the dust removal outlet above the cooling bin (4), a transmission gear (7) on the outer wall of the middle part of the kiln body (1), symmetrical support wheels (6) on the outer walls of both ends of the kiln body (1), the support wheels (6) are placed on pulleys (8), the pulleys (8) are mounted on pulley support seats (8a) via axles, and the pulley support seats (8a) are mounted on a first support seat (9a). The moving gear (7) meshes with the driving gear (11). The driving gear (11) is mounted on the gear support (11a) via a rotating shaft. The gear support (11a) is mounted on the second support (9b). The rotating shaft of the driving gear (11) is connected to the transmission shaft of the motor (10) mounted on the second support (9b) via a coupling, forming the rotating structure of the kiln body. The kiln body (1) is composed of an outer wall layer (1a), an electromagnetic coil (1b), a graphite heating layer (1c), and an inner wall layer (1d) from the outside to the inside. The inner wall layer (1d) is equipped with several evenly distributed spiral blades (1e), forming the tumbling and propulsion structure of the material.

8. The method for preparing boron carbide powder based on rotary kiln induction heating according to claim 7, characterized in that, The graphite heating layer (1c) is an antioxidant coating graphite material with high purity, high density, and high strength, which is inlaid on the inner wall of the kiln.

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