An apparatus and method for removing large particles of fine powder

Abstract

A device for removing large particles from fine powder, comprising a stirring tank, a separation tank, a siphon pipeline and a water adding pipeline. A slurry pipeline is connected to the bottom of the stirring tank, and a slurry pump is installed on the slurry pipeline. A pre-stirring mechanism for pre-stirring the fine powder slurry is also installed on the stirring tank. Two separation chambers are arranged side by side in the separation tank. The upper and middle parts of the separation chamber are cylindrical, and the lower parts of the separation chamber are frustum-shaped. A fixed separation stirring shaft is installed in each separation chamber. The bottom of the separation stirring shaft extends to the bottom of the separation chamber and is fixedly installed with a separation stirring paddle. The top of the separation stirring shaft extends to the outside of the separation chamber. A separation stirring power mechanism for driving the separation stirring shaft to rotate is fixedly installed on the separation tank. The device has a simple structure and is easy to operate. Through the repeated water addition, sedimentation and siphon treatment of the fine powder by the separation tank, the removal of large particles in the fine powder is realized, effectively ensuring the production purity of the fine powder.

Description

Technical Field

[0001] The present invention relates to the technical field of fine powder production, in particular to a device for removing large particles from fine powder, and also relates to a method for removing large particles using the above-mentioned device for removing large particles from fine powder. Background Art

[0002] Fine powder is a micron-level abrasive material, generally referring to abrasive grains with a size less than 63 μm. According to the material, it mainly includes brown fused alumina fine powder, garnet fine powder, slag fine powder, etc. The processing of abrasive fine powder has three characteristics: fine product particle size, narrow particle size distribution, and no impurity pollution.

[0003] Currently, during the production process of fine powder, it is necessary to remove and purify large particles in the fine powder. Especially for the grinding and polishing of precision materials, the content of large particles in the fine powder is required to be extremely low. If the content of large particles exceeds the standard, it is very easy to cause scratches on the surface of precision materials, resulting in processing failure. It is necessary to re-grind the scratched surface and then re-grind and polish it again, which will cause waste of resources and increase in costs. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a device for removing large particles from fine powder that is reasonably designed, easy to operate, and can effectively remove large particles in the fine powder in view of the deficiencies of the prior art.

[0005] Another technical problem to be solved by the present invention is to provide a method for removing large particles using the above-mentioned device for removing large particles from fine powder.

[0006] The technical problem to be solved by the present invention is achieved through the following technical solutions. The present invention is a device for removing large particles from fine powder, which includes a stirring tank, a separation tank, a siphon pipeline, and a water addition pipeline. A slurry pipeline for transporting slurry into the separation tank is connected to the bottom of the stirring tank. A slurry pump is installed on the slurry pipeline. A pre-stirring mechanism for pre-stirring the fine powder slurry is also installed on the stirring tank. Two separation chambers are arranged side by side in the separation tank. The upper and middle parts of the separation chamber are cylindrical, and the lower parts of the separation chamber are frustum-shaped. A fixed separation stirring shaft is installed in each separation chamber. The bottom of the separation stirring shaft extends to the bottom of the separation chamber and is fixedly installed with a separation stirring paddle. The top of the separation stirring shaft extends to the outside of the separation chamber. A separation stirring power mechanism for driving the separation stirring shaft to rotate is fixedly installed on the separation tank.

[0007] The technical problem to be solved by the present invention can also be further achieved through the following technical scheme. For the device for removing micropowder and large particles described above, the pre-mixing mechanism includes a driving mechanism fixedly installed on the top of the mixing cylinder and a pre-mixing shaft vertically inserted in the mixing cylinder. The top of the pre-mixing shaft is connected to the pre-driving mechanism, and the bottom of the pre-mixing shaft extends to the bottom of the mixing cylinder and is fixedly provided with a pre-mixing paddle.

[0008] The technical problem to be solved by the present invention can also be further achieved through the following technical scheme. For the device for removing large particles of micropowder described above, the driving mechanism is a first driving motor, the first driving motor is fixedly installed on the top of the mixing tank, and the pre-mixing shaft is drivingly connected to the output shaft of the first driving motor.

[0009] The technical problem to be solved by the present invention can also be further achieved through the following technical scheme. For the device for removing micro-powder and large particles described above, the separation and stirring power mechanism includes a second drive motor, the second drive motor is fixedly installed on the top of the mixing cylinder, and the separation and stirring shaft is drivingly connected to the output shaft of the second drive motor.

[0010] The technical problem to be solved by the present invention can also be further achieved by the following technical scheme. For the above-mentioned device for removing micro-powder and large particles, the lower part of the separation chamber is in a truncated cone shape, and the ratio of the upper bottom, lower bottom and height of the lower part of the separation chamber is 1:5:3, and the ratio of the height of the lower part of the separation chamber to the height of the separation chamber is 1:3.

[0011] The technical problem to be solved by the present invention can be further achieved through the following technical scheme. For the above-mentioned device for removing micro-powder and large particles, a siphon free end is provided at one end of the siphon pipe, and the other end of the siphon pipe is connected to a sedimentation tank; a water adding free end is provided at one end of the water adding pipe, and the other end of the water adding pipe is connected to an external water supply pipe.

[0012] The technical problem to be solved by the present invention can be further achieved by the following technical scheme. For the above-mentioned device for removing micro-powder and large particles, a water outlet pipe is arranged at 1 / 6 of the height of the separation cylinder, and the water outlet of the water outlet pipe is arranged upward; a discharge pipe is also arranged at the bottom of the separation cylinder.

[0013] The technical problem to be solved by the present invention can be further achieved by the following technical solutions. For the above-mentioned device for removing large micropowder particles, a method for removing large micropowder particles is provided, and the steps are as follows:

[0014] (1) First, add the micro powder slurry into the mixing tank and stir it. After stirring evenly, send it into the separation tank. The ratio of micro powder to water is 1:4;

[0015] (2) Insert one end of the feeding pipeline into the bottom of the separation tank, and add slurry into the separation tank until it reaches 100 mm below the top edge of the separation tank.

[0016] (3) After adding the slurry, let it stand for 6 hours, and then use the siphon pipeline to suck out the slurry 200 mm below the liquid surface, so that the liquid level drops by 200 mm.

[0017] (4) Then, stir the separation tank for 20 - 30 minutes, let it stand for another 6 hours, and then use the siphon pipeline to suck out the slurry 200 mm below the liquid surface, so that the liquid level drops by another 200 mm.

[0018] (5) Repeat step (4) once; the slurry sucked out in the above three times is sent to the first sedimentation tank for sedimentation, and small particles are removed.

[0019] (6) Add water to the separation tank until the water level reaches 100 mm below the top edge of the separation tank, then let it stand for 2 hours, and then use the siphon pipeline to suck the water level in the separation tank to 1 / 3 of the height of the separation tank at 1 / 3 of the height of the separation tank.

[0020] (7) Repeat step (6) three times, and finally discharge the water level in the separation tank through the outlet of the outlet pipeline to 1 / 6 of the height of the separation tank; the slurry sucked out in the above three times is sent to the second sedimentation tank to obtain qualified products.

[0021] (8) Through the discharge port reserved at the bottom of the separation tank, suck the remaining slurry into the third sedimentation tank, and the large particles obtained can be collected and used according to the requirements of other products.

[0022] Compared with the prior art, the present invention first uses a stirring tank to hold the micro - powder slurry, stirs the micro - powder slurry evenly, then sends the micro - powder slurry into the separation tank, then uses the water - adding pipeline to add water into the separation tank, and uses the siphon pipeline to perform siphon water treatment according to the liquid level in the separation tank. By repeating such operations, based on the principle that large particles are heavy and settle fast, while small particles are light and settle slow, the small particles, qualified products and large particles in the micro - powder are completely separated, realizing the particle classification of the micro - powder. The device has a simple structure and is easy to operate. Through the repeated water - adding, sedimentation and siphon treatment of the micro - powder in the separation tank, the removal of large particles in the micro - powder is realized, effectively ensuring the production purity of the micro - powder. Brief Description of the Drawings

[0023] Figure 1 It is a schematic structural diagram of the present invention. Detailed Embodiments

[0024] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings of the present invention. Obviously, the described embodiments are 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.

[0025] Reference Figure 1 , a device for removing large particles of micro-powder, the device comprises a stirring cylinder 1, a separation cylinder 2, a siphon pipe 3 and a water supply pipe 4, a slurry pipe 7 for conveying slurry into the separation cylinder 2 is connected to the bottom of the stirring cylinder 1, a slurry pump 8 is installed on the slurry pipe 7, and a pre-stirring mechanism 5 for pre-stirring the micro-powder slurry is also installed on the stirring cylinder 1; two separation chambers distributed side by side are arranged in the separation cylinder 2, the upper and middle parts of the separation chambers are cylindrical, and the lower parts of the separation chambers are truncated, and a fixed separation stirring shaft 9 is installed in each separation chamber, the bottom of the separation stirring shaft 9 extends to the bottom of the separation chamber, and a separation stirring paddle 10 is fixedly installed, the top of the separation stirring shaft 9 extends to the outside of the separation chamber, and a separation stirring power mechanism 6 for driving the separation stirring shaft 9 to rotate is fixedly installed on the separation cylinder 2. The mixing tank 1 is used to contain and pre-mix the micro-powder slurry added to the separation tank 2 to ensure uniform mixing of the slurry; the slurry pipeline 7 is used to transport the micro-powder slurry in the mixing tank 1 to the separation tank 2 to remove large particles; the water supply pipeline 4 extends into the separation tank 2 to facilitate repeated water supply to the separation tank 2; the siphon pipeline 3 is set to extend into the separation tank 2 to facilitate the drainage operation of the separation tank 2 through the siphon operation; the separation chamber is set to reduce the space in the separation tank 2 to prevent the micro-powder from being trapped in the separation tank 2 The upper and middle parts of the two separation chambers are connected, and the lower parts are separated, which is convenient for accelerating the sedimentation and separation of the micro-powder in the separation cylinder 2; the separation stirring power mechanism 6 is used to drive the separation stirring shaft 9 to drive the separation stirring paddle 10 to rotate in the separation chamber to achieve the stirring operation, and the micro-powder and water are fully mixed, which is convenient for separating the large particles in the micro-powder; the slurry pipeline 7 is connected with two slurry branch pipelines, which are respectively used to cooperate with the two separation chambers and transport the micro-powder slurry to the two separation chambers at the same time.

[0026] The pre-mixing mechanism 5 includes a driving mechanism fixedly mounted on the top of the mixing tank 1 and a pre-mixing shaft vertically inserted into the mixing tank 1. The top of the pre-mixing shaft is connected to the pre-driving mechanism, and the bottom of the pre-mixing shaft extends to the bottom of the mixing tank 1 and is fixedly mounted with a pre-mixing paddle. The pre-driving mechanism is used to drive the pre-mixing shaft to rotate, thereby driving the pre-mixing paddle to perform a stirring operation in the mixing tank 1, and stirring the micro-powder slurry in the mixing tank 1 evenly.

[0027] The driving mechanism is a first driving motor. The first driving motor is fixedly installed on the top of the stirring cylinder 1 through a mounting bracket. The pre-stirring shaft is in transmission connection with the output shaft of the first driving motor. A fixed gear is fixedly installed on the pre-stirring shaft, and a transmission gear meshing with the fixed gear is fixedly installed on the output shaft of the first driving motor. When the first driving motor rotates, through the cooperation of the transmission gear and the fixed gear, the pre-stirring shaft is driven to rotate, so as to realize the stirring operation of the stirring cylinder 1 and stir the micro-powder slurry in the stirring cylinder 1 evenly.

[0028] The separating and stirring power mechanism 6 includes a second driving motor. The second driving motor is fixedly installed on the top of the stirring cylinder 1 through a mounting bracket. The separating and stirring shaft 9 is in transmission connection with the output shaft of the second driving motor. A fixed gear is fixedly installed on the separating and stirring shaft 9, and a transmission gear meshing with the fixed gear is fixedly installed on the output shaft of the second driving motor. When the second driving motor rotates, through the cooperation of the transmission gear and the fixed gear, the separating and stirring shaft 9 is driven to rotate, so as to realize the stirring operation of the separating cylinder 2.

[0029] The lower parts of the separation chambers are all frustum-shaped. The ratio of the upper bottom, lower bottom and height of the lower part of the separation chamber is 1:5:3, and the ratio of the height of the lower part of the separation chamber to the height of the separation chamber is 1:3.

[0030] One end of the siphon pipe 3 is provided with a siphon free end, which is convenient for extending into different heights in the separating cylinder 2 to perform siphon operations with different requirements. The other end of the siphon pipe 3 is communicated with a sedimentation tank. A siphon pump is also installed on the siphon pipe 3 to realize the siphon operation of the micro-powder solution in the separating cylinder 2 by the siphon pipe 3. The sedimentation tank is used to hold the micro-powder solution siphoned from the separating cylinder 2; Multiple sedimentation tanks can be provided to facilitate separately holding the micro-powder solution obtained each time; One end of the water adding pipe 4 is provided with a water adding free end, which is convenient for extending into the separating cylinder 2 to add water into the separating cylinder 2 from different heights in the separating cylinder 2. The other end of the water adding pipe 4 is communicated with an external water supply pipe; Preferably, both the siphon free end and the water adding free end are provided with 2, which are respectively used to cooperate with 2 separation chambers to realize siphon and water adding operations.

[0031] An outlet pipe 12 is provided at 1 / 6 of the height of the separating cylinder 2. The outlet of the outlet pipe 12 is arranged inside the separating cylinder and the outlet is arranged upward, which is convenient for overflow discharging to output the qualified products in the separating cylinder 2 to the outside; A discharging pipe 11 is also provided at the bottom of the separating cylinder 2 to facilitate finally taking out the remaining large particles in the separating cylinder 2; An outlet control valve is also installed on the outlet pipe 12, and a discharging control valve is also installed on the discharging pipe 11.

[0032] A method for removing micro-powder large particles is as follows:

[0033] (1)First, add the fine powder slurry into the stirring tank for stirring. After stirring evenly, send it into the separation tank. The ratio of fine powder to water is 1:4.

[0034] (2)Insert one end of the feeding pipeline into the bottom of the separation tank, and add the slurry into the separation tank until it reaches 100 mm below the top edge of the separation tank.

[0035] (3)After adding the slurry, let it stand for 6 hours. Then, use the siphon pipeline to suck out the slurry 200 mm below the liquid surface, so that the liquid level drops by 200 mm.

[0036] (4)Next, stir the separation tank for 20 - 30 minutes, then let it stand for 6 hours. Then, use the siphon pipeline to suck out the slurry 200 mm below the liquid surface, so that the liquid level drops by another 200 mm.

[0037] (5)Repeat step (4) once. The slurry sucked out three times above is sent to the first sedimentation tank for sedimentation, and small particles are removed.

[0038] (6)Add water to the separation tank until the water level reaches 100 mm below the top edge of the separation tank, then let it stand for 2 hours. Then, use the siphon pipeline to suck the water level in the separation tank to 1 / 3 of the height of the separation tank at 1 / 3 of the height of the separation tank.

[0039] (7)Repeat step (6) three times. Finally, discharge the water level in the separation tank through the outlet of the outlet pipeline to 1 / 6 of the height of the separation tank. That's it. The slurry sucked out three times above is sent to the second sedimentation tank to obtain qualified products.

[0040] (8)Through the discharge port reserved at the bottom of the separation tank, suck the remaining slurry into the third sedimentation tank. The large particles obtained can be collected and used according to the requirements of other products.

Claims

1. A method for removing large particles of micro powder, Features: The method uses a device for removing large particles of micro-powders, which includes a stirring cylinder, a separation cylinder, a siphon pipe and a water supply pipe. A slurry pipe for conveying slurry into the separation cylinder is connected to the bottom of the stirring cylinder, a slurry pump is installed on the slurry pipe, and a pre-stirring mechanism for pre-stirring the micro-powder slurry is also installed on the stirring cylinder; two separation chambers distributed side by side are arranged in the separation cylinder, the upper and middle parts of the separation chambers are cylindrical, and the lower parts of the separation chambers are truncated cone-shaped, and a fixed separation stirring shaft is installed in each separation chamber, the bottom of the separation stirring shaft extends to the bottom of the separation chamber and is fixedly installed with a separation stirring paddle, the top of the separation stirring shaft extends to the outside of the separation chamber, and a separation stirring power mechanism for driving the separation stirring shaft to rotate is fixedly installed on the separation cylinder; The upper and middle parts of the two separation chambers are connected, and the lower parts are separated; The lower part of the separation chamber is in a truncated cone shape, the ratio of the upper bottom, the lower bottom and the height of the lower part of the separation chamber is 1:5:3, and the ratio of the height of the lower part of the separation chamber to the height of the separation chamber is 1:3; A water outlet pipe is provided at 1 / 6 of the height of the separation cylinder, and the water outlet of the water outlet pipe is provided upward; a discharge pipe is also provided at the bottom of the separation cylinder; The steps of this method are as follows: (1) First, add the micro powder slurry into the mixing tank and stir it. After stirring evenly, send it into the separation tank. The ratio of micro powder to water is 1:4; (2) Extend one end of the feeding pipe into the bottom of the separation cylinder and add slurry into the separation cylinder until it reaches 100 mm below the top edge of the separation cylinder; (3) After adding the slurry, let it stand for 6 hours, then use a siphon pipe to draw out the slurry from 200 mm below the liquid surface, so that the liquid level drops by 200 mm; (4) Next, stir the separation tank for 20-30 minutes, let it stand for 6 hours, and then use a siphon pipe to draw away the slurry from 200 mm below the liquid surface, so that the liquid level drops another 200 mm; (5) Repeat step (4) once; the slurry extracted three times is sent to the first sedimentation tank for sedimentation, and small particles are removed; (6) Add water to the separation tank until the water level is 100 mm below the top edge of the separation tank, then let it stand for 2 hours, and then use a siphon pipe to pump the water level in the separation tank from 1 / 3 of the height of the separation tank to 1 / 3 of the height of the separation tank; (7) Repeat step (6) three times, and for the last time, discharge the water level in the separation tank through the outlet of the water outlet pipe to 1 / 6 of the height of the separation tank; the slurry extracted three times is sent to the second sedimentation tank to obtain qualified products; (8) The remaining slurry is pumped to the third sedimentation tank through the discharge port reserved at the bottom of the separation cylinder. The large particles obtained can be collected and used according to the needs of other products.

2. The method for removing large particles of micropowder according to claim 1, Features: The pre-mixing mechanism comprises a driving mechanism fixedly mounted on the top of the mixing cylinder and a pre-mixing shaft vertically inserted into the mixing cylinder. The top of the pre-mixing shaft is transmission-connected to the driving mechanism, and the bottom of the pre-mixing shaft extends to the bottom of the mixing cylinder and is fixedly mounted with a pre-mixing paddle.

3. The method for removing large particles of micropowder according to claim 2, It is characterized in that: The driving mechanism is a first driving motor, the first driving motor is fixedly installed on the top of the stirring cylinder, and the pre-stirring shaft is in transmission connection with the output shaft of the first driving motor.

4. The method for removing large microparticle powder according to claim 1, It is characterized in that: The separation and stirring power mechanism includes a second driving motor, the second driving motor is fixedly installed on the top of the stirring cylinder, and the separation and stirring shaft is in transmission connection with the output shaft of the second driving motor.

5. The method for removing large microparticle powder according to claim 1, It is characterized in that: One end of the siphon pipe is provided with a siphon free end, and the other end of the siphon pipe is communicated with a sedimentation tank; one end of the water adding pipe is provided with a water adding free end, and the other end of the water adding pipe is communicated with an external water supply pipe.

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