Carbon black granulation forming screening electrostatic separation method and equipment

Abstract

The invention discloses a carbon black granulation forming screening electrostatic separation method and equipment, and relates to the technical field of carbon black production and particle separation. The carbon black particles are electrified in the electrified box and repel each other, and the vibration electrostatic screen with the same polarity as the particle charges is matched, so that the bounce and dispersion performance of the particles is enhanced, and more efficient screening is facilitated. The photoelectric monitoring mechanism is used for monitoring the condition of carbon black particles falling from each area of the vibrating electrostatic screen in real time, and whether the screen is blocked or not and the blocking position can be accurately judged by comparing the falling number of the particles within the preset duration with a standard reference value. When blockage is found, the corresponding area of the electrostatic plate is electrified to generate the electric polarity opposite to that of the carbon black particles, the blockage particles are attracted in a targeted mode, and accurate localized blockage dredging is achieved. Meanwhile, different from a traditional negative pressure dredging mode, negative pressure is prevented from being generated on all screen holes of the whole screen plate, new blockage is prevented from being generated, and the screening efficiency and stability are greatly improved.

Description

Technical Field

[0001] The present invention relates to the technical fields of carbon black production and particle sorting, and particularly to a method and equipment for electrostatic separation of carbon black granulation, forming, screening Background Art

[0002] In the process of carbon black production, the sorting link after the granulation and forming of carbon black particles is crucial. Currently, industrial production generally uses vibrating screens to screen carbon black particles. However, in actual production, many problems are faced, seriously affecting the screening efficiency and quality.

[0003] On the one hand, the particle size distribution of carbon black particles has a significant impact on the screening efficiency. When the content of particles with a particle size close to the sieve hole size in carbon black particles is relatively large, these particles are extremely likely to get stuck in the sieve holes, thereby blocking the sieve mesh. Once the sieve mesh is blocked, the speed at which particles pass through the sieve holes will be greatly reduced, resulting in a sharp decline in the screening efficiency.

[0004] On the other hand, when particles with significantly different particle sizes are mixed together, the large particles will hinder the screening process of the small particles. When the large particles move on the vibrating screen, they will occupy a large space, and it is difficult for the small particles to find a suitable path to pass through the sieve holes. This situation will also affect the screening effect and reduce the quality of the final product.

[0005] In summary, the existing carbon black particle screening technology has obvious defects, and there is an urgent need for a more efficient and reliable screening method and equipment to solve the above problems. Summary of the Invention

[0006] To solve the above technical problems, the present invention is realized through the following technical solutions:

[0007] The present invention provides a method for electrostatic separation of carbon black granulation, forming, and screening, including the following steps:

[0008] S1. After the carbon black particles are granulated, they are introduced into a charging box, and the carbon black particles are charged and repel each other.

[0009] S2. The charged carbon black particles are introduced into a separation device, and a vibrating electrostatic sieve with static electricity passed through it in the separation device screens the carbon black particles; among them, the electrode polarity of the vibrating electrostatic sieve is the same as the charge polarity of the carbon black particles.

[0010] S3. The carbon black particles with a particle size not exceeding the sieve hole size of the vibrating electrostatic sieve fall through the vibrating electrostatic sieve.

[0011] S4. An optoelectronic monitoring mechanism configured beside the vibrating electrostatic sieve monitors the status of the carbon black particles falling in each area of the vibrating electrostatic sieve in real time. Let the number of carbon black particles falling in any area of the vibrating electrostatic sieve monitored by the optoelectronic monitoring mechanism within a preset time period t be M x , judge Mx The relationship with the preset standard reference value M0: If M x ≥ M0, it is determined that there is no blockage in the current area of the vibrating electrostatic sieve; if M x < M0, it is determined that there is a blockage in the current area of the vibrating electrostatic sieve.

[0012] S5. When there is a blockage in the vibrating electrostatic sieve, the corresponding area of the electrostatic plate directly below the vibrating electrostatic sieve is electrified, generating an electrode polarity opposite to the charge carried by the carbon black particles, and attracting the blocked carbon black particles in the area where the blockage condition of the vibrating electrostatic sieve exceeds the standard. Among them, the energizing current I of the corresponding area of the electrostatic plate is proportional to ΔM, and ΔM = M0 - M x .

[0013] As a preferred technical solution of the electrostatic separation method of the present invention: After the carbon black particles enter the charging box, during the charging process, the carbon black particles are stirred to make the charging more uniform.

[0014] As a preferred technical solution of the electrostatic separation method of the present invention: The carbon black particles with a particle size exceeding the sieve hole size of the vibrating electrostatic sieve are discharged from the upper surface of the vibrating electrostatic sieve and separated from the equipment.

[0015] As a preferred technical solution of the electrostatic separation method of the present invention: When there is a blockage in the vibrating electrostatic sieve, the single-time energizing duration t of the corresponding area of the electrostatic plate x is proportional to ΔM. Starting from the start of energization, within the duration t max (t max > t x ):

[0016] (1) If the photoelectric monitoring mechanism monitors that the number of carbon black particles falling in the corresponding area of the vibrating electrostatic sieve is not less than the standard reference value M0, stop the re-energization of the corresponding area of the electrostatic plate;

[0017] (2) If the photoelectric monitoring mechanism monitors that the number of carbon black particles falling in the corresponding area of the vibrating electrostatic sieve is less than the standard reference value M0, then after the duration t max ends, re-energize the electrostatic plate for a duration t x , until the condition (1) is met.

[0018] The present invention provides a screening electrostatic separation device for implementing the above-mentioned electrostatic separation method for carbon black granulation and forming screening, including the following structural configurations:

[0019] The separation device is provided with an inclined vibrating electrostatic sieve, a feed cavity located above the vibrating electrostatic sieve, an electrostatic plate located directly below the vibrating electrostatic sieve, a separation discharge cavity located between the vibrating electrostatic sieve and the electrostatic plate, and a photoelectric monitoring mechanism embedded in the side wall of the separation discharge cavity. Among them, the photoelectric monitoring mechanism includes a plurality of continuously distributed photoelectric modules, and the electrostatic plate includes a plurality of continuously distributed electrostatic modules, and the electrostatic modules and the photoelectric modules are independently aligned one by one.

[0020] The separation device is also connected to a charged box for injecting charged carbon black particles into the feed cavity, and the separation device is also equipped with a controller for controlling the vibrating electrostatic sieve, the photoelectric monitoring mechanism, and the electrostatic plate.

[0021] As a preferred technical solution of the electrostatic separation device of the present invention: the electrostatic plate is parallel to the vibrating electrostatic sieve.

[0022] As a preferred technical solution of the electrostatic separation device of the present invention: a feed port is provided at the connection position between the charged box and the feed cavity of the separation device, and the separation device is provided with a large particle discharge port at the most downstream position of the moving direction of carbon black particles on the vibrating electrostatic sieve.

[0023] As a preferred technical solution of the electrostatic separation device of the present invention: the outer shell of the separation device is made of engineering plastic or ceramic or other insulating materials.

[0024] As a preferred technical solution of the electrostatic separation device of the present invention: the plurality of photoelectric modules of the photoelectric monitoring mechanism are electrically connected to the controller in parallel, and the plurality of electrostatic modules of the electrostatic plate are electrically connected to the controller in parallel.

[0025] As a preferred technical solution of the electrostatic separation device of the present invention: the separation device is equipped with a humidity sensing module for monitoring the real-time humidity inside the separation device and a dehumidification mechanism for ensuring the dryness inside the separation device.

[0026] Compared with the existing technology, the beneficial effects of the present invention are:

[0027] 1. In the present invention, carbon black particles are charged in a charging box and repel each other. In cooperation with a vibrating electrostatic sieve having the same charge polarity as the particle charge, the bouncing and dispersing performance of the particles is enhanced, which helps to screen more efficiently. The photoelectric monitoring mechanism is used to monitor the condition of the carbon black particles falling in each area of the vibrating electrostatic sieve in real time. By comparing the number of particles falling within a preset time period with the standard reference value, it is possible to accurately judge whether the sieve mesh is blocked and the position of the blockage. When a blockage is detected, the corresponding area of the electrostatic plate is energized to generate an electrode polarity opposite to that of the carbon black particles, specifically attracting the blocked particles to achieve precise localized blockage removal (to avoid causing negative interference to the unblocked areas. If the unblocked areas are forcibly energized and attracted, blockages may occur). At the same time, different from the traditional method of removing blockages by negative pressure, the present invention avoids generating negative pressure on all the sieve holes of the entire sieve plate, preventing the generation of new blockages and greatly improving the screening efficiency and stability.

[0028] 2. In the present invention, both the energizing current of the corresponding area of the electrostatic plate and the single-time energizing duration are proportional to the degree of blockage, and the working state of the electrostatic plate is intelligently controlled according to the feedback of the photoelectric monitoring mechanism within t max time. This intelligent adjustment mechanism can flexibly adjust the working parameters of the electrostatic plate according to the actual blockage situation, ensuring effective blockage removal while avoiding excessive interference with the normal screening process, thereby reducing energy consumption, achieving energy-saving and optimized operation of the equipment, and reducing production costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a schematic diagram of the overall structure of the electrostatic separation device in the present invention.

[0030] Figure 2 is Figure 1 a partially enlarged schematic diagram of the structure at A in

[0031] Wherein: 1 - separation device, 101 - feed chamber, 102 - feed inlet, 103 - vibrating electrostatic sieve, 104 - separation and discharge chamber, 105 - large particle discharge port, 106 - electrostatic plate, 1061 - electrostatic module, 107 - photoelectric monitoring mechanism, 1071 - photoelectric module; 2 - charging box; 3 - controller. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0032] In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0033] Embodiment 1. In the present invention, a carbon black granulation and forming screening electrostatic separation device is designed, and its main structural configuration is as follows:

[0034] Main structure of the separation device: Please refer toFigure 1 , the housing of the separation device 1 is made of insulating material, effectively preventing static electricity leakage, avoiding the influence of external electromagnetic interference on the internal static electric field of the device and the screening process, and ensuring the stability and reliability of the device operation. Inside the separation device 1, there is an inclined vibrating electrostatic sieve 103, a feed cavity 101 located above the vibrating electrostatic sieve 103, an electrostatic plate 106 located directly below the vibrating electrostatic sieve 103, a separation discharge cavity 104 located between the vibrating electrostatic sieve 103 and the electrostatic plate 106, and a photoelectric monitoring mechanism 107 embedded in the side wall of the separation discharge cavity 104. The electrostatic plate 106 is parallel to the vibrating electrostatic sieve 103.

[0035] Upstream charged carbon black particle supply device: Please refer to Figure 1 , the separation device 1 is connected to the charged box 2, and the charged box 2 injects charged carbon black particles into the feed cavity 101 through the feed port 102.

[0036] Key components: Combining Figure 1 and Figure 2 , the photoelectric monitoring mechanism 107 is composed of a plurality of continuously distributed photoelectric modules 1071, and the electrostatic plate 106 is composed of a plurality of continuously distributed electrostatic modules 1061, and the electrostatic module 1061 and the photoelectric module 1071 are independently aligned one by one. During the actual working process, when the photoelectric monitoring mechanism 107 conducts detection, its detection direction can be understood as the direction perpendicular to the paper surface. In addition, the separation device 1 is also equipped with a controller 3, and this controller 3 undertakes the important task of controlling the operation of the vibrating electrostatic sieve 103, the photoelectric monitoring mechanism 107, and the electrostatic plate 106. It should be noted that the plurality of photoelectric modules 1071 of the photoelectric monitoring mechanism 107 and the plurality of electrostatic modules 1061 of the electrostatic plate 106 are electrically connected to the controller 3 in parallel. This connection method enables each module to work independently without interference, and is convenient for the controller 3 to precisely control them.

[0037] Other optimization designs: In order to further improve the performance and screening effect of the device, the separation device 1 is also equipped with a humidity sensing module and a dehumidification mechanism. The humidity sensing module is responsible for monitoring the real-time humidity inside the separation device 1, and the dehumidification mechanism is used to ensure the dryness inside the separation device 1, avoiding the influence of excessive humidity on the charging performance and screening effect of carbon black particles.

[0038] Embodiment 2. The present invention designs a carbon black granulation and forming screening electrostatic separation method, and the specific method content is as follows:

[0039] First, carbon black particle charging treatment: The granulated carbon black particles are introduced into the charged box 2 to make the carbon black particles carry charges, and the particles repel each other due to the same charges. During the charging process of the charged box 2, the carbon black particles are stirred to make the charging of the carbon black particles more uniform.

[0040] Second, screening by the vibrating electrostatic sieve: The charged carbon black particles are introduced into the separation device 1 and screened by the vibrating electrostatic sieve 103 with static electricity applied. The polarity of the electrodes of the vibrating electrostatic sieve 103 is the same as the polarity of the charge carried by the carbon black particles, which increases the bouncing and dispersing performance of the carbon black particles.

[0041] Third, particle separation: The carbon black particles with particle sizes not exceeding the sieve hole size of the vibrating electrostatic sieve 103 fall through the vibrating electrostatic sieve 103; the carbon black particles with particle sizes exceeding the sieve hole size of the vibrating electrostatic sieve 103 are discharged from the upper surface of the vibrating electrostatic sieve 103 and leave the separation device 1 through the large particle discharge port 105.

[0042] Fourth, monitoring of sieve mesh blockage: An optoelectronic monitoring mechanism 107 is arranged beside the vibrating electrostatic sieve 103 to monitor the condition of the carbon black particles falling in each area of the vibrating electrostatic sieve 103 in real time. By setting a preset time period t, the number M of carbon black particles falling monitored by the optoelectronic monitoring mechanism 107 during this time period (i.e., the number of times the optoelectronic signal is blocked) is counted. x And it is compared with the preset standard reference value M0 to judge whether the sieve mesh is blocked.

[0043] Fifth, electrostatic blockage removal: When there is a blockage in the vibrating electrostatic sieve 103, the corresponding area of the electrostatic plate 106 directly below the vibrating electrostatic sieve 103 is electrified. After the corresponding area of the electrostatic plate 106 is electrified, an electrode polarity opposite to the charge carried by the carbon black particles is generated, attracting the blocked carbon black particles. The energizing current I in the corresponding area of the electrostatic plate 106 is proportional to the blockage degree ΔM, and ΔM = M0 - M. x The single - time energizing duration t x is also proportional to ΔM.

[0044] During the time period t max (where t max > t x ), the working state of the electrostatic plate 106 is controlled according to the feedback of the optoelectronic monitoring mechanism 107:

[0045] (1) If the optoelectronic monitoring mechanism 107 monitors that the number of carbon black particles falling in the corresponding area of the vibrating electrostatic sieve 103 is not less than the standard reference value M0, the re - energization of the corresponding area of the electrostatic plate 106 is stopped.

[0046] (2) If the optoelectronic monitoring mechanism 107 monitors that the number of carbon black particles falling in the corresponding area of the vibrating electrostatic sieve 103 is less than the standard reference value M0, after the time period t max ends, the electrostatic plate 106 is re - energized for the time period t x until the condition (1) is met.

[0047] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A carbon black pelletizing, forming, screening and electrostatic separation method, characterized in that: Includes the following: S1. After granulation, the carbon black particles are introduced into the charging box, where the carbon black particles are charged and the particles repel each other; S2. The charged carbon black particles are introduced into a separation device, and a vibrating electrostatic screen with static electricity in the separation device is used to screen the carbon black particles; Among them, the polarity of the charge on the vibrating electrostatic screen is the same as the polarity of the charge carried by the carbon black particles; S3. Carbon black particles whose particle size does not exceed the mesh size of the vibrating electrostatic sieve fall through the vibrating electrostatic sieve; S4. The photoelectric monitoring mechanism configured below and beside the vibrating electrostatic screen monitors the status of the carbon black particles falling from each area of ​​the vibrating electrostatic screen in real time; Assume that the photoelectric monitoring mechanism detects that the number of carbon black particles falling from any area of ​​the vibrating electrostatic screen within the preset time t is M x , judge M x The relationship between the preset standard reference value M0 is: If M x >=M0, it is determined that the current area of ​​the vibrating electrostatic screen is not blocked; If M x <M0, it is determined that there is a blockage in the current area of the vibrating static sieve; S5. When the vibrating electrostatic screen is blocked, the corresponding area of ​​the electrostatic plate directly below the vibrating electrostatic screen is electrified, generating an electric polarity different from the charge carried by the carbon black particles, and attracting the carbon black particles blocked in the area where the vibrating electrostatic screen is blocked beyond the standard; Among them, the current I∝ΔM in the area corresponding to the electrostatic plate, ΔM=M0-M x .

2. A carbon black granulation, molding, screening and electrostatic separation method according to claim 1, characterized in that: After the carbon black particles enter the charging box, they are stirred during the charging process to make the charging more uniform.

3. A carbon black granulation, molding, screening and electrostatic separation method according to claim 1, characterized in that: Carbon black particles whose particle size exceeds the mesh size of the vibrating electrostatic screen are discharged from the separation device along the upper surface of the vibrating electrostatic screen.

4. A carbon black pelletizing, forming, screening and electrostatic separation method according to claim 1, characterized in that: When the vibrating electrostatic screen is blocked, the corresponding area of ​​the electrostatic plate is powered on for a single time. x ∝ΔM; Start timing from power on, and in duration t max (t max >t x ) time: (i) If the photoelectric monitoring mechanism detects that the number of carbon black particles falling from the corresponding area of ​​the vibrating electrostatic screen is not less than the standard reference value M0, the corresponding area of ​​the electrostatic plate is stopped from being energized again; (ii) If the photoelectric monitoring mechanism detects that the number of carbon black particles falling from the corresponding area of ​​the vibrating electrostatic screen is lower than the standard reference value M0, then within the time t max After the end, the electrostatic plate is powered on again for a period of time t x , until condition (a) is met.

5. A screening electrostatic separation device for implementing the carbon black pelletizing and forming screening electrostatic separation method according to claim 1, characterized in that: The separation device (1) is provided with an inclined vibrating electrostatic screen (103), a feeding chamber (101) located above the vibrating electrostatic screen (103), an electrostatic plate (106) located directly below the vibrating electrostatic screen (103), a separation discharge chamber (104) located between the vibrating electrostatic screen (103) and the electrostatic plate (106), and a photoelectric monitoring mechanism (107) embedded in the side wall of the separation discharge chamber (104); The photoelectric monitoring mechanism (107) includes a plurality of continuously distributed photoelectric modules (1071), the electrostatic plate (106) includes a plurality of continuously distributed electrostatic modules (1061), and the electrostatic modules (1061) and the photoelectric modules (1071) are independently aligned one by one; The separation device (1) is also connected to a charging box (2) for injecting charged carbon black particles toward the feed chamber (101), and the separation device (1) is also equipped with a controller (3) for controlling a vibrating electrostatic screen (103), a photoelectric monitoring mechanism (107), and an electrostatic plate (106).

6. The screening electrostatic separation device according to claim 5, characterized in that: The electrostatic plate (106) and the vibrating electrostatic screen (103) are parallel to each other.

7. The screening electrostatic separation device according to claim 5, characterized in that: A feed port (102) is provided at a position where the charged box (2) is connected to the feed chamber (101) of the separation device (1), and the separation device (1) is provided with a large particle discharge port (105) located at the most downstream position of the carbon black particle movement direction of the vibrating electrostatic screen (103).

8. The screening electrostatic separation device according to claim 5, characterized in that: The shell of the separation device (1) is made of engineering plastics, ceramics or other insulating materials.

9. The screening electrostatic separation device according to claim 5, characterized in that: The multiple photoelectric modules (1071) of the photoelectric monitoring mechanism (107) are electrically connected to the controller (3) in parallel, and the multiple electrostatic modules (1061) of the electrostatic plate (106) are electrically connected to the controller (3) in parallel.

10. The screening electrostatic separation device according to claim 5, characterized in that: The separation device (1) is equipped with a humidity sensing module for monitoring the real-time humidity inside the separation device (1) and a dehumidification mechanism for ensuring the dryness inside the separation device (1).

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