Electrostatic separation method and equipment for carbon black granulation molding screening

Abstract

The application discloses a carbon black granulation forming screening electrostatic separation method and equipment, and relates to the technical fields of carbon black production and particle sorting. The carbon black particles are electrified and repel each other in the electrification box, and are matched with a vibrating electrostatic screen with the same polarity as the particle charge, so that the bouncing and dispersing performance of the particles is enhanced, and the screening is more efficient. The photoelectric monitoring mechanism is used to monitor the falling state of the carbon black particles in each area of the vibrating electrostatic screen in real time, the number of particles falling in a preset time period is compared with a standard reference value, and it can be judged whether the screen is blocked and the blocked position is accurate. When the blockage is found, the electrostatic plate corresponding area is electrified to generate an opposite polarity to the carbon black particles, and the blocked particles are attracted specifically to realize accurate local unblocking. Meanwhile, unlike the traditional negative pressure unblocking method, the application avoids generating negative pressure on all screen holes of the whole screen plate, prevents new blockage, and greatly improves the screening efficiency and stability.

Description

Technical Field

[0001] This invention relates to the fields of carbon black production and particle sorting technology, and in particular to a method and equipment for electrostatic separation of carbon black granulation, molding, screening and separation. Background Technology

[0002] In the carbon black production process, the sorting stage after carbon black granulation is crucial. Currently, vibrating screens are commonly used in industry for screening carbon black granules. However, actual production faces numerous problems that severely affect the efficiency and quality of screening.

[0003] On the one hand, the particle size distribution of carbon black has a significant impact on screening efficiency. When there is a high content of carbon black particles with a diameter close to the sieve aperture size, these particles are very likely to get stuck in the sieve apertures, thus clogging the screen. Once the screen is clogged, the speed at which particles pass through the sieve apertures will decrease significantly, leading to a sharp drop in screening efficiency.

[0004] On the other hand, when particles with significantly different sizes are mixed together, the larger particles can hinder the screening process of the smaller particles. When large particles move on a vibrating screen, they occupy a large space, making it difficult for smaller particles to find a suitable path through the screen openings. This situation also affects the screening effect and reduces the quality of the final product.

[0005] In summary, existing carbon black particle screening technologies have significant shortcomings, 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-mentioned technical problems, the present invention is achieved through the following technical solution:

[0007] This invention provides a method for electrostatic separation of carbon black granulation, molding, screening, and other processes, comprising the following:

[0008] S1. After granulation, carbon black particles are introduced into a charged box. The carbon black particles are charged and repel each other.

[0009] S2. Charged carbon black particles are introduced into a separation device, where a vibrating electrostatic screen carrying static electricity screens the carbon black particles. The polarity of the vibrating electrostatic screen is the same as the polarity of the charge carried by the carbon black particles.

[0010] S3. Carbon black particles whose particle size does not exceed the screen aperture size of the vibrating electrostatic screen fall through the vibrating electrostatic screen.

[0011] S4. A photoelectric monitoring mechanism located beside the vibrating electrostatic screen monitors the falling carbon black particles in each area of ​​the screen in real time. Let M be the number of carbon black particles falling in any area of ​​the vibrating electrostatic screen within a preset time t as detected by the photoelectric monitoring mechanism. x Determine 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 powered on, 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 power - on duration t of the corresponding area of the electrostatic plate x is proportional to ΔM. Starting from the start of power - on timing, 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 - power - on 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, after the duration t max ends, re - power - on the electrostatic plate for a duration t x , until 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 screening, including the following structural configurations:

[0019] The separation equipment includes an inclined vibrating electrostatic screen, a feed chamber above the vibrating electrostatic screen, an electrostatic plate directly below the vibrating electrostatic screen, a separation discharge chamber between the vibrating electrostatic screen and the electrostatic plate, and a photoelectric monitoring mechanism embedded in the side wall of the separation discharge chamber. The photoelectric monitoring mechanism comprises multiple continuously distributed photoelectric modules, and the electrostatic plate comprises multiple continuously distributed electrostatic modules. Each electrostatic module and photoelectric module is independently aligned.

[0020] The separation equipment is also connected to a charged box that injects charged carbon black particles into the feed chamber. The separation equipment is also equipped with a controller for controlling the vibrating electrostatic screen, photoelectric monitoring mechanism, and electrostatic plate.

[0021] As a preferred technical solution of the electrostatic separation device of the present invention: the electrostatic plate and the vibrating electrostatic screen are parallel to each other.

[0022] As a preferred technical solution of the electrostatic separation device of the present invention: a feed inlet is provided at the position where the charging box and the feed chamber of the separation device are connected, and the separation device is provided with a large particle discharge outlet located at the downstream position of the carbon black particles moving in the vibrating electrostatic screen.

[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, ceramic or other insulating materials.

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

[0026] Compared with existing technologies, the beneficial effects of this invention are:

[0027] 1. This invention enhances the bouncing and dispersing properties of carbon black particles by charging them in a charged box, causing them to repel each other. Combined with a vibrating electrostatic sieve with the same charge polarity as the particles, this facilitates more efficient screening. A photoelectric monitoring mechanism monitors the falling carbon black particles in different areas of the vibrating electrostatic sieve in real time. By comparing the number of particles falling within a preset time period with a standard reference value, it can accurately determine whether the sieve is clogged and the location of the clog. When a clog is detected, the corresponding area of ​​the electrostatic plate is energized, generating an electrode polarity opposite to that of the carbon black particles, specifically attracting the clogged particles and achieving precise localized unblocking (avoiding negative interference to areas that are not clogged; forcibly energizing areas that were not clogged before may cause them to become clogged). Furthermore, unlike traditional methods that rely on negative pressure for unblocking, this invention avoids generating negative pressure on all sieve holes of the entire sieve plate, preventing new clogs and greatly improving screening efficiency and stability.

[0028] 2. In this invention, the current flowing through the corresponding area of ​​the electrostatic plate and the duration of single-time energization are both directly proportional to the degree of blockage, and t max The system intelligently controls the working status of the electrostatic plate based on feedback from the photoelectric monitoring mechanism within a given time frame. This intelligent adjustment mechanism can flexibly adjust the working parameters of the electrostatic plate according to the actual blockage situation, ensuring effective unblocking while avoiding excessive intervention in the normal screening process, thereby reducing energy consumption, achieving energy-efficient and optimized operation of the equipment, and reducing production costs. Attached Figure Description

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

[0030] Figure 2 for Figure 1 A magnified structural diagram of part A in the middle.

[0031] Wherein: 1-separation equipment, 101-feeding chamber, 102-feeding inlet, 103-vibrating electrostatic screen, 104-separation discharge chamber, 105-large particle discharge outlet, 106-electrostatic plate, 1061-electrostatic module, 107-photoelectric monitoring mechanism, 1071-photoelectric module; 2-electric box; 3-controller. Detailed Implementation

[0032] To make the objectives, technical solutions, and advantages of this invention clearer, the 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 merely illustrative and not intended to limit the invention.

[0033] Example 1: This invention designs a carbon black granulation, molding, screening, and electrostatic separation device, the main structural configuration of which is as follows:

[0034] Main structure of the separation equipment: Please refer to Figure 1 The outer shell of the separation device 1 is made of insulating material, which effectively prevents static leakage and avoids the influence of external electromagnetic interference on the internal electrostatic field and screening process, ensuring the stability and reliability of the equipment operation. The separation device 1 is equipped with an inclined vibrating electrostatic screen 103, a feed 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 electrostatic plate 106 is parallel to the vibrating electrostatic screen 103.

[0035] Upstream charged carbon black particle supply equipment: 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 chamber 101 through the feed inlet 102.

[0036] Key components: assembly Figure 1 and Figure 2 The photoelectric monitoring mechanism 107 consists of multiple continuously distributed photoelectric modules 1071, while the electrostatic plate 106 consists of multiple continuously distributed electrostatic modules 1061, with each electrostatic module 1061 independently aligned with the photoelectric module 1071. In actual operation, when the photoelectric monitoring mechanism 107 performs detection, its detection direction can be understood as perpendicular to the plane of the paper. Furthermore, the separation device 1 is equipped with a controller 3, which plays a crucial role in controlling the operation of the vibrating electrostatic screen 103, the photoelectric monitoring mechanism 107, and the electrostatic plate 106. It is noteworthy that the multiple photoelectric modules 1071 of the photoelectric monitoring mechanism 107 and the multiple electrostatic modules 1061 of the electrostatic plate 106 are all electrically connected to the controller 3 in parallel. This connection method allows each module to work independently without interference and facilitates precise control by the controller 3.

[0037] Other optimized designs: To further improve the performance and screening effect of the equipment, 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, while the dehumidification mechanism is used to ensure the dryness of the separation device 1, so as to avoid affecting the charge-carrying properties and screening effect of carbon black particles due to excessive humidity.

[0038] Example 2: This invention designs a method for electrostatic separation of carbon black granulation, molding, screening, and other processes. The specific method is as follows:

[0039] First, the carbon black particles are charged: the granulated carbon black particles are introduced into charging box 2, causing the particles to become charged. The particles repel each other because they share the same charge. During the charging process in charging box 2, the carbon black particles are stirred to ensure a more uniform charge distribution.

[0040] Second, electrostatic sieve screening: The charged carbon black particles are introduced into the separation device 1 and screened by an electrostatically charged vibrating electrostatic sieve 103. The polarity of the electrostatic sieve 103 is the same as the polarity of the charge on the carbon black particles, which increases the bounce and dispersion performance of the carbon black particles.

[0041] Third, particle separation: Carbon black particles whose particle size does not exceed the screen aperture size of vibrating electrostatic screen 103 fall through vibrating electrostatic screen 103; carbon black particles whose particle size exceeds the screen aperture size of vibrating electrostatic screen 103 are discharged from the separation device 1 along the upper surface of vibrating electrostatic screen 103 and leave from the large particle discharge port 105.

[0042] Fourth, screen blockage monitoring: A photoelectric monitoring mechanism 107 is installed below and beside the vibrating electrostatic screen 103 to monitor the status of falling carbon black particles in each area of ​​the vibrating electrostatic screen 103 in real time. By setting a preset time period t, the number of falling carbon black particles monitored by the photoelectric monitoring mechanism 107 during this time period (i.e., the number of times the photoelectric signal is blocked) M is counted. x It is then compared with the preset standard reference value M0 to determine whether the screen is clogged.

[0043] Fifth, electrostatic unblocking: When the vibrating electrostatic screen 103 is blocked, the corresponding area of ​​the electrostatic plate 106 directly below the vibrating electrostatic screen 103 is energized. After being energized, the corresponding area of ​​the electrostatic plate 106 generates an polarity opposite to that of the carbon black particles, attracting the blocked carbon black particles. The current I flowing through the corresponding area of ​​the electrostatic plate 106 is proportional to the degree of blockage ΔM, ΔM = M0 - M x The duration of power-on operation per cycle is t x It is also proportional to ΔM.

[0044] During duration t max Within a time period (where t) max >t x The operating status of the electrostatic plate 106 is controlled based on feedback from the photoelectric monitoring mechanism 107.

[0045] (i) If the photoelectric monitoring mechanism 107 detects that the number of carbon black particles falling in the area corresponding to the vibrating electrostatic screen 103 is not lower than the standard reference value M0, then the power supply to the area corresponding to the electrostatic plate 106 will be stopped again.

[0046] (ii) If the photoelectric monitoring mechanism 107 detects that the number of carbon black particles falling in the corresponding area of ​​the vibrating electrostatic screen 103 is lower than the standard reference value M0, then in time t max After the process is completed, the electrostatic plate 106 is energized again for a duration t. x Until condition (i) is met.

[0047] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A method of carbon black granulation, forming, screening and electrostatic separation, characterized in that, Includes the following: S1. After granulation, carbon black particles are introduced into a charged box. The carbon black particles are charged and repel each other. S2. Charged carbon black particles are introduced into the separation equipment, where a vibrating electrostatic screen carrying static electricity screens the carbon black particles. Among them, the polarity of the electrostatic sieve 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 screen aperture size of the vibrating electrostatic screen fall through the vibrating electrostatic screen. S4. The photoelectric monitoring mechanism configured on the side below the vibrating electrostatic screen monitors the status of carbon black particles falling in each area of ​​the vibrating electrostatic screen in real time. The photoelectric monitoring mechanism monitors the number of carbon black particles falling in any area of the vibrating electrostatic screen within a preset time t, which is M x The relationship between M x and the preset standard reference value M0 is determined. If M x > = M0, then determine that the current area of the vibrating electrostatic screen is not blocked. If M x If M0, it is determined that there is a blockage in the current area of the vibrating electrostatic screen; S5. When the vibrating electrostatic screen is clogged, the corresponding area of ​​the electrostatic plate directly below the vibrating electrostatic screen is energized, generating an electrode polarity that is opposite to the charge carried by the carbon black particles, which attracts the carbon black particles clogged in the area of ​​the vibrating electrostatic screen where the clogging condition exceeds the standard. Wherein, the electrostatic plate corresponding region current I∝ΔM, ΔM=M0-M x .

2. The method for electrostatic separation of carbon black granulation, molding, screening, and separation 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. The method for electrostatic separation of carbon black granulation, molding, screening, and separation according to claim 1, characterized in that: Carbon black particles whose size exceeds the screen aperture size of the vibrating electrostatic screen are discharged from the separation equipment along the upper surface of the vibrating electrostatic screen.

4. The method for electrostatic separation of carbon black granulation, molding, screening, and separation according to claim 1, characterized in that: When the vibrating electrostatic screen is blocked, the electrostatic plate corresponding area is powered for a single time for a duration t x ∝ ΔM; Counting from the start of energization, in a time length t max (t max >t x ) time (i) If the photoelectric monitoring mechanism detects that the number of carbon black particles falling in the corresponding area of ​​the vibrating electrostatic screen is not lower than the standard reference value M0, then stop the re-energizing of the corresponding area of ​​the electrostatic plate. (ii) If the photoelectric monitoring mechanism monitors that the number of carbon black particles falling in the corresponding area of the vibrating electrostatic screen is lower than the standard reference value M0, then the electrostatic plate is powered again for a time t max after the end of the first time t x , until condition (i) is met.

5. A screening electrostatic separation device for implementing the carbon black granulation, molding, screening, and electrostatic separation method of claim 1, characterized in that: The separation device (1) is equipped 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 multiple continuously distributed photoelectric modules (1071), and the electrostatic plate (106) includes multiple continuously distributed electrostatic modules (1061). The electrostatic modules (1061) and the photoelectric modules (1071) are independently aligned. The separation device (1) is also connected to a charged box (2) that injects charged carbon black particles toward the feed chamber (101). The separation device (1) is also equipped with a controller (3) for controlling the vibrating electrostatic screen (103), photoelectric monitoring mechanism (107), and electrostatic plate (106).

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

7. The electrostatic separation equipment for screening according to claim 5, characterized in that: The electric box (2) is connected to the feed chamber (101) of the separation device (1) with a feed inlet (102). The separation device (1) is provided with a large particle outlet (105) located at the downstream position of the carbon black particles moving on the vibrating electrostatic screen (103).

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

9. The electrostatic separation equipment for screening 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 electrostatic separation screening 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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