Boron carbide powder water classification system
By using a boron carbide powder water classification system, precise classification of boron carbide powder and water resource recovery can be achieved through water flow control. This solves the problems of insufficient accuracy and water waste in traditional classification methods, and reduces production costs and environmental pressure.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- DALIAN ZHENGXING ABRASIVES CO LTD
- Filing Date
- 2025-05-12
- Publication Date
- 2026-05-12
AI Technical Summary
In traditional boron carbide powder production processes, dry classification cannot achieve accurate classification, while water classification leads to water waste.
A boron carbide powder water classification system is adopted, which uses water flow control to classify materials. It includes an overflow classification tank, a first separation unit and a water circulation unit. By regulating the water flow, boron carbide powder of different particle sizes can be separated and water resources can be recycled.
This enables more precise control of boron carbide powder particle size, reduces water waste, lowers production and environmental protection costs, and shortens product cycles.
Smart Images
Figure CN224221538U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of boron carbide powder production technology, and specifically to a boron carbide powder water classification system. Background Technology
[0002] With the continuous advancement of boron carbide processing technology, its application areas as a new material are expanding, and market demand is increasing. Traditional boron carbide powder production processes involve classifying the ground and purified powder to produce products with different particle sizes. Classification methods include dry classification and aqueous classification. Dry classification cannot achieve precise classification, while aqueous classification requires a large amount of water to classify and extract the resulting slurry after purifying the ground boron carbide powder, resulting in water waste. Utility Model Content
[0003] In view of this, the present invention discloses a boron carbide powder water classification system, specifically using water to classify boron carbide powder, the specific scheme of which is as follows:
[0004] A boron carbide powder water classification system includes an overflow classification tank, a first separation unit, and a water circulation unit;
[0005] The first separation unit includes a first filter press and a first overflow pipeline. The inlet of the first overflow pipeline is located at the outlet of the overflow classifier. The first filter press is located on the first overflow pipeline and below the outlet of the overflow classifier. The inlet of the first overflow pipeline is used to collect the boron carbide powder aqueous suspension produced by the overflow classifier.
[0006] The water circulation unit includes a low-level water storage tank, a pressure pump, a pressure stabilizing device, a water circulation pipeline, a flow meter, and valves. The low-level water storage tank is located below the first filter press, and the outlet of the first overflow pipeline is located above the low-level water storage tank. The inlet of the water circulation pipeline is connected to the low-level water storage tank, and the outlet is connected to the overflow grading tank. The pressure pump, pressure stabilizing device, flow meter, and valves are arranged on the water circulation pipeline along the fluid flow direction.
[0007] As a supplement to the technical solution of this utility model, the first separation unit also includes a storage tank, and the storage tank and the first filter press are arranged sequentially on the first overflow pipeline along the flow direction of the boron carbide powder water suspension.
[0008] As a supplement to the technical solution of this utility model, multiple sets of the first separation units are arranged in parallel.
[0009] As a supplement to the technical solution of this utility model, a second separation unit is also included, which includes a second overflow pipeline and a stepped collection tank;
[0010] The inlet of the second overflow pipeline is located at the outlet of the overflow classifier. The inlet of the second overflow pipeline is used to collect the boron carbide powder aqueous suspension produced by the overflow classifier. The outlet of the second overflow pipeline is located above the low-level storage tank. The stepped collection tank is located on the second overflow pipeline.
[0011] The stepped collection tank is provided with at least one set of baffles along the flow direction of the suspension inside, and the top of the baffles is lower than the top surface of the inner wall of the stepped collection tank; the stepped collection tank is provided with an inlet and an outlet, wherein the bottom height of the inlet is higher than the top height of any baffle, and the bottom height of the outlet is lower than the top height of any baffle.
[0012] As a supplement to the technical solution of this utility model, the number of baffles is three sets, and the three sets of baffles are arranged sequentially along the flow direction of the suspension. The height of the three sets of baffles decreases sequentially along the flow direction of the suspension. The first set of baffles and the area where the inlet of the stepped collection tank is located form a first settling chamber. An intermediate settling chamber is formed between two adjacent sets of baffles. The third set of baffles and the area where the outlet of the stepped collection tank is located form a final settling chamber. The opening of the inlet faces the first settling chamber. Each settling chamber forms an overflow channel through the top of the baffle. When the liquid level in the upstream settling chamber exceeds the top of the corresponding baffle, the fluid enters the downstream settling chamber through the overflow channel.
[0013] As a supplement to the technical solution of this utility model, multiple sets of the second separation units are arranged in parallel.
[0014] As a supplement to the technical solution of this utility model, boron carbide powder with a particle size of less than 20 micrometers is collected using a first separation unit, and boron carbide powder with a particle size of more than 20 micrometers is collected using a second separation unit.
[0015] As a supplement to the technical solution of this utility model, the water circulation unit also includes a high-level water storage tank, which is installed on the water circulation pipeline and located between the pressure stabilizing device and the flow meter. The high-level water storage tank is located above the overflow grading tank.
[0016] As a supplement to the technical solution of this utility model, a pretreatment unit is also included, which includes a ball mill, a boron carbide powder conveying pipeline, a pneumatic diaphragm pump, a reaction vessel, and a second filter press. One end of the boron carbide powder conveying pipeline is connected to the ball mill, and the other end is connected to the second filter press. The pneumatic diaphragm pump and the reaction vessel are arranged sequentially on the boron carbide powder conveying pipeline along the conveying direction of the boron carbide powder.
[0017] As a supplement to the technical solution of this utility model, the overflow classifier includes a tank body, a collection trough, and a conveying pipe. The lower part of the tank body has a conical structure, with the water inlet located at the bottom of the tank body. The collection trough is located inside the tank body, and both its upper and lower ends are provided with openings. The upper opening of the collection trough is used for the entry of boron carbide powder aqueous suspension. The upper end of the conveying pipe is connected to the lower opening of the collection trough. The conveying pipe passes through the side wall of the tank body, and its lower opening is located outside the tank body. The lower opening of the conveying pipe is the water outlet of the overflow classifier. The lower end of the conveying pipe can be connected to the first overflow pipeline of the first separation unit or the second overflow pipeline of the second separation unit according to the requirements of different particle sizes, and then subsequent boron carbide powder and water separation treatment can be performed.
[0018] Beneficial effects: This invention utilizes water flow control for material classification. As the flow rate increases, the particle size of boron carbide micropowder gradually increases. Furthermore, no material loss occurs during flow rate changes. For more precise classification, this method can be used for multiple cyclic control cycles. By using water flow rate for classification, boron carbide micropowder is obtained sequentially from fine to coarse. This not only makes it easy to control the particle size distribution of boron carbide micropowder but also allows for arbitrary changes in particle size distribution.
[0019] For graded particle sizes, products are sent to different finished product storage tanks. Different methods are used to separate moisture and materials depending on the particle size. Materials with a particle size of 20 micrometers or less, due to their slow settling rate, are fed into storage tanks and directly recycled via a filter press. This changes the traditional method of natural sedimentation in a settling tank, significantly shortening the product cycle. Coarser materials undergo a stepped sedimentation process, separating them into different stepped collection tanks corresponding to different particle sizes, thus separating the material from the water and achieving water resource recycling. Attached Figure Description
[0020] Figure 1 This is a schematic diagram of the connection structure between the overflow grading tank and the first separation unit, the second separation unit, and the water circulation unit of this utility model.
[0021] Figure 2 This is a schematic diagram of the preprocessing unit structure of this utility model.
[0022] Figure 3 This is a schematic diagram of the structural assembly of this utility model.
[0023] Figure 4 This is a schematic diagram of the overflow grading tank.
[0024] In the diagram: 1. Overflow grading tank, 2. First filter press, 3. First overflow pipeline, 4. Low-level water storage tank, 5. Pressure pump, 6. Pressure stabilizing device, 7. Water circulation pipeline, 8. Flow meter, 9. Valve, 10. Storage tank, 11. Second overflow pipeline, 12. Step collection tank, 13. Ball mill, 14. Boron carbide powder conveying pipeline, 15. Pneumatic diaphragm pump, 16. Reaction tank, 17. Second filter press, 18. High-level water storage tank, 19. Tank body, 20. Collection trough, 21. Conveying pipe. Detailed Implementation
[0025] In the description of this utility model, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.
[0026] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.
[0027] like Figures 1 to 3 As shown, a boron carbide powder water classification system includes an overflow classification tank 1, a first separation unit, and a water circulation unit.
[0028] Overflow classifier 1 achieves efficient separation of boron carbide powder of different particle sizes in an aqueous suspension by adjusting the influent flow rate parameters. For example, 0-0.25m 3 A flow rate of / h yields 1-10 micron boron carbide powder; 0.25-0.5m 3 A flow rate of / h yields 10-20 micron boron carbide powder; 0.5-0.7m 3 A flow rate of / h yields 20-30 micron boron carbide powder; 0.7-0.95m 3 A flow rate of / h yields 30-40 micrometer boron carbide powder; 0.95-1.2m 3 A flow rate of / h yields 40-50 micron boron carbide powder.
[0029] The first separation unit is used to separate water and boron carbide powder in a boron carbide powder aqueous suspension. It includes a first filter press 2 and a first overflow pipeline 3. The inlet of the first overflow pipeline 3 is located at the outlet of the overflow classifier 1. The boron carbide powder aqueous suspension, after being classified by the overflow classifier 1, flows into the first overflow pipeline 3. The first filter press 2 is mounted on the first overflow pipeline 3, positioned below the outlet of the overflow classifier 1, allowing the boron carbide powder aqueous suspension to flow into the first filter press 2 by gravity. The first filter press 2 separates the water and boron carbide powder in the suspension. The boron carbide powder is stored in the filter chamber of the first filter press 2, while the water is discharged through the drain outlet of the first filter press 2.
[0030] The water circulation unit is used to recover the water separated by the first separation unit and transport it to the overflow grading tank 1 for reuse. It includes a low-level water storage tank 4, a pressure pump 5, a pressure stabilizing device 6, a water circulation pipeline 7, a flow meter 8, and a valve 9. The low-level water storage tank 4 is located below the first filter press 2, and the outlet of the first overflow pipeline 3 is located above the low-level water storage tank 4, allowing the water separated by the first filter press 2 to flow into the low-level water storage tank 4 by gravity for storage. The inlet of the water circulation pipeline 7 is connected to the low-level water storage tank 4, and the other end is connected to the overflow grading tank 1. The pressure pump 5, pressure stabilizing device 6, flow meter 8, and valve 9 are arranged along the fluid flow direction on the water circulation pipeline 7. The pressure pump 5 provides power for the water flow, the pressure stabilizing device 6 ensures stable water pressure, the flow meter 8 monitors the water flow rate, and the valve 9 adjusts the water flow rate in the water circulation pipeline 7.
[0031] The aforementioned "water circulation pipeline 7" specifically refers to the main pipeline system for fluid transmission. Its function is to carry the fluid and connect the pressure pump 5, pressure stabilizing device 6, flow meter 8, and valve 9 in sequence to form a passage through which the fluid flows sequentially through each device.
[0032] When the system is in operation, the pressure pump 5 first draws water from the low-level storage tank 4 and transports it to the overflow classifier tank 1 through the water circulation pipeline 7. The water flow rate is controlled by adjusting the opening of valve 9 in conjunction with flow meter 8. The smaller the water flow rate, the smaller the boron carbide powder particle size in the boron carbide powder suspension flowing out of the overflow classifier tank 1. The boron carbide powder suspension flowing out of the overflow classifier tank 1 enters the first filter press 2, where it separates the water from the boron carbide powder. The boron carbide powder is stored in the filter chamber of the first filter press 2, while the water is discharged through the drain port of the first filter press 2 and flows back to the low-level storage tank 4 by gravity, thus achieving the technical effect of boron carbide powder recovery and water recycling. The above steps not only achieve the goal of graded material collection but also significantly reduce wastewater discharge, thereby lowering production and environmental costs.
[0033] As a supplement to the above technical solution, the first separation unit also includes a storage tank 10, which and the first filter press 2 are sequentially arranged on the first overflow pipeline 3 along the flow direction of the boron carbide powder aqueous suspension. The aforementioned "pipeline" specifically refers to the main pipeline system for fluid transmission, which carries the fluid and connects the storage tank 10 and the first filter press 2 in sequence to form a passage through which the fluid flows sequentially through each device.
[0034] The purpose of the storage tank 10 is to store the suspension when the first filter press 2 malfunctions and needs maintenance. Furthermore, when the filter press is an intermittent filter press, the suspension can be stored in the storage tank 10 during the solid-liquid separation process, ensuring the continuity of the process without needing to shut down the first overflow line 3.
[0035] As a supplement to the above technical solution, multiple sets of the first separation units can be arranged in parallel, and multiple sets of first separation units can work simultaneously to separate boron carbide powder in the boron carbide powder aqueous suspension. Alternatively, different first separation units can be selectively activated based on different water flow rates. For example, when the overflow classifier 1 uses a small water flow to overflow the boron carbide powder aqueous suspension containing particles smaller than 20 micrometers, the inlet of the first overflow pipeline 3 of the first set of first separation units is matched with the outlet of the overflow classifier 1, allowing the boron carbide powder aqueous suspension smaller than 20 micrometers to smoothly enter the first overflow pipeline 3 of the first set of first separation units. The inlets of the first overflow pipelines 3 of the other sets of first separation units are removed from the outlet of the overflow classifier 1. The boron carbide powder aqueous suspension smaller than 20 micrometers flows into the storage tank 10 of the first set of first separation units for storage, and the boron carbide powder aqueous suspension in the storage tank 10 is subjected to solid-liquid separation in stages using a filter press. Then, the water flow rate can be further increased, connecting the inlet of the first overflow pipeline 3 of the second group of first separation units to the outlet of the overflow classifier 1, and removing the inlets of the first overflow pipelines 3 of the other groups of first separation units from the outlet of the overflow classifier 1, so that the 20-30 micron boron carbide powder aqueous suspension flows into the storage tank 10 of the second group of first separation units for storage. The connection between the first overflow pipeline 3 of different separation units and the outlet of the overflow classifier 1 can be manually adjusted by the operator.
[0036] In the above technical solution, the boron carbide powder in the boron carbide powder aqueous suspension mainly relies on the separation and recovery of filter press. The operation of the filter press requires electricity, and for large-scale boron carbide powder classification systems, the output of boron carbide powder is directly affected by the number of filter presses, which increases the production cost.
[0037] As a preferred embodiment of this utility model, it further includes a second separation unit, which includes a second overflow pipeline 11 and a stepped collection tank 12. The inlet of the second overflow pipeline 11 is located at the outlet of the overflow grading tank 1, and the outlet of the second overflow pipeline 11 is located above the low-level water storage tank 4. The stepped collection tank 12 is located on the second overflow pipeline 11.
[0038] The stepped collection tank 12 has at least one set of baffles arranged inside along the flow direction of the suspension, and the top of the baffles is lower than the top surface of the inner wall of the stepped collection tank 12; the stepped collection tank 12 is provided with an inlet and an outlet, wherein the bottom height of the inlet is higher than the top height of any baffle, and the bottom height of the outlet is lower than the top height of any baffle.
[0039] After entering the stepped collection tank 12 through the inlet, the suspended solids first settle in one side region (A) of the baffle. When the liquid level on this side exceeds the top of the baffle, the suspended liquid overflows to the other side region (B). The other side region (B) then performs another settling process on the overflowing suspended liquid. When the liquid level in this region reaches the preset discharge height, the fluid flows out of the stepped collection tank 12 through the outlet. Through the above arrangement, boron carbide powder can settle in the stepped collection tank 12, and water flows out from the outlet and enters the low-level storage tank 4 through the second overflow pipeline 11.
[0040] As a supplement to the above technical solution, the number of baffles is preferably three sets. The three sets of baffles are arranged sequentially along the flow direction of the suspension, and the height of the three sets of baffles decreases sequentially along the flow direction of the suspension. The first set of baffles and the area where the inlet of the stepped collection tank 12 is located form a first settling chamber. An intermediate settling chamber is formed between two adjacent sets of baffles. The third set of baffles and the area where the outlet of the stepped collection tank 12 is located form a final settling chamber. The opening of the inlet faces the first settling chamber. Each settling chamber forms an overflow channel through the top of the baffle. When the liquid level in the upstream settling chamber exceeds the top of the corresponding baffle, the fluid enters the downstream settling chamber through the overflow channel.
[0041] As a supplement to the above technical solution, multiple sets of the second separation unit can be arranged in parallel. Similar to the first separation unit, the stepped collection tanks 12 of the multiple sets of second separation units can be used for boron carbide powder with different particle sizes according to the water flow rate. The operator can manually adjust and control whether the inlet of different second overflow pipelines 11 is connected to the outlet of the overflow grading tank 1.
[0042] As a preferred technical solution of this utility model, both the first separation unit and the second separation unit can exist independently in the system. For example, the system may only have the first separation unit and not the second separation unit; or only have the second separation unit and not the first separation unit.
[0043] When only the first separation unit is set up, the overall system cost is high due to the filter press.
[0044] When only the second separation unit is set up, boron carbide powder smaller than 20 micrometers does not settle well in the stepped collection tank 12.
[0045] Therefore, using the first separation unit to collect boron carbide powder smaller than 20 micrometers and the second separation unit to collect boron carbide powder larger than 20 micrometers can achieve the best results in terms of separation effect and cost.
[0046] As a preferred embodiment of this invention, the water circulation unit further includes an elevated water storage tank 18, which is disposed on the water circulation pipeline 7 and located between the pressure stabilizing device 6 and the flow meter 8. The elevated water storage tank 18 is positioned above the overflow grading tank 1. The elevated water storage tank 18 further increases the stability of water delivery to the overflow grading tank 1.
[0047] As a preferred technical solution of this utility model, it also includes a pretreatment unit for pretreating boron carbide powder. The pretreatment unit includes a ball mill 13, a boron carbide powder conveying pipeline 14, a pneumatic diaphragm pump 15, a reaction vessel 16, and a second filter press 17. The ball mill 13 is used to grind the boron carbide powder with a larger particle size to obtain boron carbide powder with a smaller particle size. One end of the boron carbide powder conveying pipeline 14 is connected to the ball mill 13, and the other end is connected to the second filter press 17. The pneumatic diaphragm pump 15, the reaction vessel 16, and the boron carbide powder conveying pipeline 14 are arranged sequentially along the conveying direction of the boron carbide powder.
[0048] After grinding, the boron carbide powder is transported to the reaction tank 16 by the pneumatic diaphragm pump 15 for purification to form a boron carbide slurry, removing impurities from the boron carbide powder. Then, the boron carbide slurry in the reaction tank 16 is pumped into the second filter press 17 for deacidification and neutralization treatment, and boron carbide wet powder is obtained after treatment. The boron carbide wet powder is put into the mixing tank and mixed with water to form a boron carbide powder aqueous suspension, and then pumped into the overflow classification tank for overflow classification treatment.
[0049] This invention utilizes water flow control for material grading. As the flow rate increases, the particle size of boron carbide micropowder gradually increases. Furthermore, no material loss occurs during flow rate changes. For more precise grading, this method can be used for multiple cyclical control processes. Using water flow rate for grading, boron carbide micropowder is obtained sequentially from fine to coarse, which not only easily controls the particle size distribution but also allows for arbitrary changes in particle size distribution. The open overflow device controls different water flow rates, allowing for continuous sampling and particle size testing. Products meeting the specified particle size can be immediately distinguished, greatly improving the timeliness of testing and achieving precise particle size control. The graded particles are then placed in different finished product storage tanks. Different methods are used for moisture and material separation based on particle size. Materials with a particle size of less than 20 micrometers, due to their slow sedimentation rate, are fed into storage tank 10 and directly recycled through a filter press, changing the traditional method of natural sedimentation in a settling tank and significantly shortening the product cycle. Coarse materials are directly separated into different stages by step sedimentation, and then into different collection tanks 12 for different particle sizes. The material and water are separated and all the water is reused.
[0050] As a preferred technical solution of this utility model, such as Figure 4 As shown, the overflow grading tank 1 includes a tank body 19, a collection trough 20, and a conveying pipe 21. The lower part of the tank body has a conical structure, with the inlet located at the bottom of the tank body 19 for connection to the outlet of the water circulation pipeline 7. The collection trough 20 is located inside the tank body 19 and is connected to the side wall of the tank body 19 via connecting ribs, allowing the collection trough 20 to float in the upper part of the tank body 19. The collection trough 20 has openings at both the upper and lower ends. The upper opening of the collection trough 20 is an overflow port for the boron carbide powder aqueous suspension to enter. The upper end of the conveying pipe 21 is connected to the lower opening of the collection trough 20. The conveying pipe 21 passes through the side wall of the tank body 19, and the lower opening of the conveying pipe 21 is located outside the tank body 19, serving as the outlet of the overflow grading tank 1. During operation, by controlling the water flow rate into tank 19, boron carbide powder of different particle sizes is controlled to float upwards and enter the collection tank 20 under the influence of water, then flows out through conveying pipe 21. The lower end of conveying pipe 21 can be connected to the first overflow line of the first separation unit or the second overflow line of the second separation unit according to the different particle size requirements, and then subsequent boron carbide powder and water separation processing can be carried out.
[0051] Preferably, the collecting trough 20 has a conical structure, which allows the boron carbide powder aqueous suspension entering the collecting trough 20 to flow smoothly into the conveying pipe 21.
[0052] The above description is only a preferred embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be included within the protection scope of the present invention.
Claims
1. A boron carbide powder water classification system, characterized in that, Includes an overflow grading tank (1), a first separation unit, and a water circulation unit; The first separation unit includes a first filter press (2) and a first overflow pipeline (3). The inlet of the first overflow pipeline (3) is located at the outlet of the overflow classifier (1). The first filter press (2) is located on the first overflow pipeline (3) and below the outlet of the overflow classifier (1). The inlet of the first overflow pipeline (3) is used to collect the boron carbide powder aqueous suspension produced by the overflow classifier (1). The water circulation unit includes a low-level water storage tank (4), a pressure pump (5), a pressure stabilizing device (6), a water circulation pipeline (7), a flow meter (8), and a valve (9). The low-level water storage tank (4) is located below the first filter press (2), and the outlet of the first overflow pipeline (3) is located above the low-level water storage tank (4). The inlet of the water circulation pipeline (7) is connected to the low-level water storage tank (4), and the outlet is connected to the overflow grading tank (1). The pressure pump (5), pressure stabilizing device (6), flow meter (8), and valve (9) are arranged on the water circulation pipeline (7) along the fluid flow direction.
2. The boron carbide powder water classification system according to claim 1, characterized in that, The first separation unit also includes a storage tank (10), and the storage tank (10) and the first filter press (2) are sequentially arranged on the first overflow pipeline (3) along the flow direction of the boron carbide powder water suspension.
3. The boron carbide powder water classification system according to claim 1, characterized in that, Multiple sets of the first separation unit are arranged in parallel.
4. The boron carbide powder water classification system according to claim 1, characterized in that, It also includes a second separation unit, which includes a second overflow pipeline (11) and a stepped collection tank (12). The inlet of the second overflow pipeline (11) is located at the outlet of the overflow grading tank (1). The inlet of the second overflow pipeline (11) is used to collect the boron carbide powder water suspension produced by the overflow grading tank (1). The outlet of the second overflow pipeline (11) is located above the low-level water storage tank (4). The stepped collection tank (12) is located on the second overflow pipeline (11). The stepped collection tank (12) has at least one set of baffles inside along the direction of suspension flow, and the top of the baffles is lower than the top surface of the inner wall of the stepped collection tank (12). The stepped collection tank (12) is provided with an inlet and an outlet, wherein the bottom height of the inlet is higher than the top height of any baffle, and the bottom height of the outlet is lower than the top height of any baffle.
5. A boron carbide powder water classification system according to claim 4, characterized in that, The number of baffles is three sets. The three sets of baffles are arranged sequentially along the flow direction of the suspension. The height of the three sets of baffles decreases sequentially along the flow direction of the suspension. The first set of baffles and the area where the inlet of the stepped collection tank (12) is located form the first settling chamber. The two adjacent sets of baffles form an intermediate settling chamber. The third set of baffles and the area where the outlet of the stepped collection tank (12) is located form the final settling chamber. The opening of the inlet faces the first settling chamber. Each settling chamber forms an overflow channel through the top of the baffle. When the liquid level in the upstream settling chamber exceeds the top of the corresponding baffle, the fluid enters the downstream settling chamber through the overflow channel.
6. A boron carbide powder water classification system according to claim 4, characterized in that, Multiple sets of the second separation units are arranged in parallel.
7. A boron carbide powder water classification system according to claim 4, characterized in that, Boron carbide powder with a particle size of less than 20 micrometers is collected using the first separation unit, while boron carbide powder with a particle size of more than 20 micrometers is collected using the second separation unit.
8. A boron carbide powder water classification system according to claim 1, characterized in that, The water circulation unit also includes a high-level water storage tank (18), which is installed on the water circulation pipeline (7) and located between the pressure stabilizing device (6) and the flow meter (8). The high-level water storage tank (18) is located above the overflow grading tank (1).
9. A boron carbide powder water classification system according to claim 1, characterized in that, It also includes a pretreatment unit, which includes a ball mill (13), a boron carbide powder conveying pipeline (14), a pneumatic diaphragm pump (15), a reaction vessel (16), and a second filter press (17). One end of the boron carbide powder conveying pipeline (14) is connected to the ball mill (13), and the other end is connected to the second filter press (17). The pneumatic diaphragm pump (15) and the reaction vessel (16) are sequentially arranged on the boron carbide powder conveying pipeline (14) along the boron carbide powder conveying direction.
10. A boron carbide powder water classification system according to claim 1, characterized in that, The overflow grading tank (1) includes a tank body (19), a collection trough (20), and a conveying pipe (21). The lower part of the tank body (19) is a conical structure, and the water inlet is located at the bottom of the tank body (19). The collection trough (20) is located inside the tank body (19). The upper and lower ends of the collection trough (20) are provided with openings. The upper opening of the collection trough (20) is used for the entry of boron carbide powder water suspension. The upper end of the conveying pipe (21) is connected to the lower opening of the collection trough (20). The conveying pipe (21) passes through the side wall of the tank body (19), and its lower opening is located outside the tank body (19). The lower opening of the conveying pipe (21) is the water outlet of the overflow grading tank (1).