CN117599953A - A precision classification device and classification method for magnetic carbon black powder - Google Patents

Abstract

The embodiment of the application provides a magnetic carbon black powder precise classification device and a classification method, wherein the precise classification device comprises: the feeding assembly comprises a feed bin and a stirring part, a first discharge hole is formed in the bottom of the feed bin, and the stirring end of the stirring part stretches into the feed bin to stir materials; the separation assembly comprises a gas separation tube, an electromagnetic coil and an induced draft fan, wherein the electromagnetic coil is sleeved on the outer wall of the middle part of the gas separation tube, and an air outlet of the induced draft fan is communicated with the lower part of the gas separation tube; the grading sedimentation assembly comprises a sedimentation pipe, one end of the sedimentation pipe is provided with a second feeding port, the second feeding port is communicated with the upper part of the gas separation pipe, the other end of the sedimentation pipe is provided with a recycling air outlet, and the bottom of the sedimentation pipe is sequentially communicated with at least two third discharging ports along the length direction; the magnetic carbon black powder separator has the beneficial effects of simple structure, capability of separating magnetic carbon black powder from non-magnetic carbon black powder and precisely classifying the magnetic carbon black powder; is suitable for the technical field of classification of magnetic carbon black.

Description

A kind of magnetic carbon black powder precision classification device and classification method

Technical field

The present application relates to the technical field of magnetic carbon black classification, and specifically relates to a magnetic carbon black powder precision classification device and classification method.

Background technique

Magnetic carbon black has good chemical stability and is not easily oxidized, reduced and decomposed. Not only can it be stored in the air for a long time, it can also exist stably in a high temperature environment for a long time without being burned or decomposed. Therefore, magnetic carbon black has broad application prospects in medicine, chemical industry, environmental protection, etc. When used as a drug carrier, magnetic carbon black can control the drug release rate and adsorb the toxicity of the drug; when used as a catalyst carrier and heavy metal adsorbent, it can be easily suspended from suspension. Rapid recovery from liquid. The particle size and distribution of magnetic carbon black directly affect its performance. Precise classification of magnetic carbon black can better exert the use effect of magnetic carbon black with different particle sizes.

In order to solve the above problems, the patent with publication number CN211887805U discloses a high-efficiency screening and grading device for carbon black, including a screening and grading base, a screening and grading shell, a screening and grading chamber, etc., and the rotating rod and the rotating shaft are driven to rotate on the rotating shaft seat through the work of the motor. When the screed component rotates with the rotating rod, the bristles are constantly in contact with the carbon black particles, and push the carbon black particles to make the carbon black particles fall at the corresponding screen into the corresponding receiving box. The screening and grading base is cylindrical. The interior of the screening and grading base is a cavity structure. There are partitions evenly arranged along the radius direction in the cavity of the screening and grading base. The partitions separate the cavity of the screening and grading base into multiple compartments. The upper ends of the multiple compartments are evenly spaced. A screen is provided, and this arrangement makes the screen arranged in a ring.

The patent with publication number CN218282599U discloses a carbon black granulation and classification device, which includes a mixing pot main body, a discharge pipe installed at the bottom of the extrusion barrel, a fixed seat below the mixing pot main body, and a storage tank on the upper surface of the fixed seat. , there is a first storage box in the slot, a groove is provided at the right end of the fixed base, and a second storage box is provided in the groove. There is a sieve plate above the fixed base, and there are sieve plates on the sieve plate corresponding to the storage slot. The screen, the lower surface of the screen plate is equipped with a vibration motor near the left end, and the outer wall of the insert column is equipped with a spring. This carbon black granulation and classification device facilitates manual control of the produced carbon by setting a discharge pipe with a valve. The black particles enter the sieve plate and are classified and stored with the cooperation of multiple screens. The vibration motor drives the sieve plate to vibrate, so that the carbon black particles on the sieve plate fall one after another, and the inserts and springs cooperate to keep the sieve plate in the fixed seat. Shake up and down to guide the carbon black particles to continue grading operations.

The above classification methods are all methods for classifying ordinary carbon black powder, and parts such as bristles or sieve plates are in direct contact with the carbon black particles, which can easily cause the magnetic carbon black material to lose magnetism and affect the use effect of the magnetic carbon black. Therefore, It is not suitable for magnetic carbon black powder; and magnetic carbon black powder is very prone to magnetic aggregation and agglomeration into larger particles during the production process, especially a large amount of non-magnetic carbon black, so conventional screening, Methods such as centrifugal sedimentation are difficult to achieve efficient and precise classification.

Contents of the invention

In order to solve one of the above technical deficiencies, embodiments of the present application provide a precision classification device and classification method for magnetic carbon black powder.

According to the first aspect of the embodiment of the present application, a magnetic carbon black powder precision classification device is provided, including: a feeding assembly, including a bin and a stirring component, and a first outlet is provided at the bottom of the bin , the stirring end of the stirring component extends into the silo to stir the material;

The separation component includes a gas separation pipe, an electromagnetic coil and an induced draft fan; the electromagnetic coil is set on the outer wall of the middle part of the gas separation pipe, and the air outlet of the induced draft fan is connected with the lower part of the gas separation pipe; The top and bottom of the gas separation pipe are respectively provided with a first feed port and a second discharge port, and the first feed port and the first discharge port are connected through a first valve;

A graded settling assembly, including a settling tube. One end of the settling tube is provided with a second feed port. The second feed port is connected to the upper part of the gas separation tube. The other end of the settling tube is provided with a recovery device. The bottom of the settling tube is connected with at least two third discharge ports in sequence along the length direction.

Preferably, an ultrasonic oscillator is provided inside the gas separation tube near the first feed inlet; the ultrasonic oscillator includes an oscillator host and an oscillator probe, and one end of the oscillator probe is inserted into In the socket of the oscillator host, the other end of the oscillator probe is located directly below the first outlet.

Preferably, a first communication pipe is connected to the air outlet of the induced draft fan, and a second valve is provided on one end of the first communication pipe away from the induced draft fan. The middle part of the first communication pipe passes through the flow meter in turn. The pressure gauge is connected to the lower part of the gas separation pipe.

More preferably, a second communication pipe is connected to the recovery air outlet, a third valve is provided on an end of the second communication pipe away from the recovery air outlet, and the middle part of the second communication pipe is connected to the guide pipe. The air inlets of the fans are connected through a fourth valve.

Preferably, a pressure balance pipe is connected between the top of the gas separation pipe and the silo, and a fifth valve is provided on the pressure balance pipe.

More preferably, the number of the third discharge openings is four.

According to the second aspect of the embodiment of the present application, a classification method of a magnetic carbon black powder precision classification device is provided, including the following steps:

S10, put the mixed carbon black powder into the silo, stir the mixed carbon black powder through the stirring component, and obtain roughly dispersed mixed carbon black powder;

S20, regulating valve;

Close the first valve, the fourth valve and the fifth valve, and open the second valve and the third valve;

Start the induced draft fan, then gradually close the second valve, and gradually open the fourth valve; gradually close the third valve, and gradually open the first valve and the fifth valve;

Start the ultrasonic oscillator host and energize the electromagnetic coil;

S30, the roughly dispersed mixed carbon black powder is separated into magnetic carbon black powder and non-magnetic carbon black powder in the separation component;

The first feed port of the gas separation pipe receives the coarsely dispersed mixed carbon black powder discharged from the first discharge port of the silo;

Then it is further dispersed by an ultrasonic oscillator installed inside the gas separation tube to obtain dispersed and mixed carbon black powder; at the same time, an induced draft fan is used to provide wind power to the inside of the gas separation tube;

The magnetic carbon black powder in the dispersed mixed carbon black powder generates an upward force under the action of the electromagnetic coil, and the magnetic carbon black powder is transported to the graded settling assembly through the second feed port with the air flow;

The non-magnetic carbon black powder in the dispersed mixed carbon black powder is discharged from the second discharge port due to gravity;

S40, perform graded settling of magnetic carbon black powder in the graded settling assembly;

After the second feed port receives the air flow and the magnetic carbon black powder, the magnetic carbon black powder is classified through at least two third discharge ports provided at the bottom of the settling tube; the closer to the third feed port at the second feed port, The larger the particle size of the magnetic carbon black powder settled in the discharge port is, the smaller the particle size of the magnetic carbon black powder settled in the third discharge port is closer to the recycling outlet.

Preferably, the following steps are also included:

S50, after the magnetic carbon black powder is classified and settled, the air flow passes through the recovery air outlet and the induced draft fan in sequence and then returns to the gas separation tube. Step S30 is repeated to recycle the air flow.

The magnetic carbon black powder precision classification device provided by this application has a simple structure and can realize the separation of magnetic carbon black powder and non-magnetic carbon black powder in the mixed carbon black powder, as well as further precise classification of the magnetic carbon black powder. , so that the magnetic carbon black powder can be precisely classified according to the particle size, and then the suitable environment for the magnetic carbon black powder can be selected according to different particle sizes, and the use effect will be better. In this application, the mixed carbon black powder in the silo is stirred by the stirring component to obtain a coarsely dispersed mixed carbon black powder. After the coarsely dispersed mixed carbon black powder enters the gas separation tube, it passes through the combined force of the induced draft fan and the electromagnetic coil. The effect separates the magnetic carbon black powder and the non-magnetic carbon black powder. The non-magnetic carbon black powder is discharged through the second discharge port due to gravity, and the magnetic carbon black powder exerts an upward effect due to the action of the electromagnetic coil. The magnetic carbon black powder is transported to the settling tube through the second feed port by force. Due to the effect of gravity in the settling tube, the magnetic carbon black powder settles in different third discharge ports in order from large to small particle size. Finally, the wind force passes through Recycle the air outlet for discharge or recycling.

Additional features and advantages of the application will be set forth in the description which follows, and in part will be apparent from the description, or may be learned by practice of the application. The objectives and other advantages of the application may be realized and attained by the written description, claims, and drawings.

Description of drawings

The drawings described here are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation of the present application. In the attached picture:

Figure 1 is a schematic structural diagram of a magnetic carbon black powder precision classification device provided by an embodiment of the present application;

Figure 2 is a particle size distribution diagram of the mixed carbon black powder before classification provided by the embodiment of the present application;

Figure 3 is a particle size distribution diagram of the classified magnetic carbon black powder provided by the embodiment of the present application;

In the picture:

10 is the feeding component, 101 is the silo, 102 is the stirring component, and 103 is the first valve;

20 is a separation component, 201 is a gas separation tube, 202 is an electromagnetic coil, 203 is an induced draft fan, 204 is an ultrasonic oscillator, 205 is a flow meter, 206 is a pressure gauge, 2011 is the second outlet, and 2031 is the second valve ;

30 is a graded settling component, 301 is a settling tube, 3011 is a second feed port, 3012 is a recovery gas outlet, 3013 is a third outlet, 3014 is a third valve, and 3015 is a fourth valve;

40 is a pressure balance pipe, and 401 is a fifth valve.

Detailed ways

In order to make the technical solutions and advantages in the embodiments of the present application clearer, the exemplary embodiments of the present application are further described in detail below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present application. This is not an exhaustive list of all embodiments. It should be noted that, as long as there is no conflict, the embodiments and features in the embodiments of this application can be combined with each other.

Figure 1 is a schematic structural diagram of a magnetic carbon black powder precision classification device provided by an embodiment of the present application. As shown in Figure 1, to address the above problems, an embodiment of the present application provides a magnetic carbon black powder precision classification device. , including: a feed assembly 10, including a bin 101 and a stirring component 102. The bottom of the bin 101 is provided with a first outlet, and the stirring end of the stirring component 102 extends into the bin 101 to stir the material;

The separation assembly 20 includes a gas separation tube 201, an electromagnetic coil 202 and an induced draft fan 203; the electromagnetic coil 202 is set on the outer wall of the middle part of the gas separation tube 201, and the air outlet of the induced draft fan 203 is connected with the lower part of the gas separation tube 201; gas separation The top and bottom of the tube 201 are respectively provided with a first feed port and a second discharge port 2011, and the first feed port and the first discharge port are connected through the first valve 103;

The graded settling assembly 30 includes a settling tube 301. One end of the settling tube 301 is provided with a second feed port 3011. The second feed port 3011 is connected to the upper part of the gas separation tube 201. The other end of the settling tube 301 is provided with a recovery outlet. The gas port 3012 and the bottom of the settling tube 301 are connected with at least two third discharge ports 3013 in sequence along the length direction. Specifically, the settling tube 301 is a hollow square tube, and the third discharge port 3013 is a square tapered tube.

The magnetic carbon black powder precision classification device provided by this application has a simple structure and can realize the separation of magnetic carbon black powder and non-magnetic carbon black powder in the mixed carbon black powder, as well as further precise classification of the magnetic carbon black powder. , so that the magnetic carbon black powder can be precisely classified according to the particle size, and then the suitable environment for the magnetic carbon black powder can be selected according to different particle sizes, and the use effect will be better. In this application, the mixed carbon black powder in the silo is stirred by the stirring component 102 to obtain coarsely dispersed mixed carbon black powder. The coarsely dispersed mixed carbon black powder enters the gas separation pipe 201 and passes through the induced draft fan 203 and electromagnetic The joint action of the coil 202 separates the magnetic carbon black powder and the non-magnetic carbon black powder. The non-magnetic carbon black powder is discharged through the second discharge port 2011 due to gravity, and the magnetic carbon black powder is discharged due to the electromagnetic coil 202. The action of the magnetic carbon black powder generates an upward force and is transported to the settling tube 301 through the second feed port 3011. In the settling tube 301, due to the effect of gravity, the magnetic carbon black powder settles in different particles in order from large to small in particle size. In the third outlet 3013, the final wind force is discharged or recovered through the recovery outlet 3012.

Further, an ultrasonic oscillator 204 is provided inside the gas separation tube 201 near the first feed inlet; the ultrasonic oscillator 204 includes an oscillator host and an oscillator probe, and one end of the oscillator probe is inserted into the socket of the oscillator host. , the other end of the oscillator probe is located directly below the first discharge port. Specifically, a fourth outlet is provided on the upper part of the gas separation tube 201, and the second feed port 3011 is connected to the upper part of the gas separation tube 201 through the fourth outlet. More specifically, the fourth outlet is provided below the ultrasonic oscillator 204 .

In this application, since there are still agglomerates in the roughly dispersed mixed carbon black powder in the silo 101, it needs to be further dispersed. The oscillator probe is set directly below the first discharge port. After the loosely mixed carbon black powder enters the gas separation tube 201, it can be dispersed by the oscillator probe. The oscillator host provides the dispersion power for the oscillator probe, and is immediately dispersed in the gas separation tube 201 near the first feed port. The agglomerates are broken up, so that what enters the middle and lower parts of the gas separation tube 201 is dispersed mixed carbon black powder, which facilitates subsequent classification and screening. The fourth outlet is provided below the ultrasonic oscillator 204, so that the magnetic carbon black powder in the dispersed and mixed carbon black powder can smoothly pass through the fourth outlet and the second inlet 3011 and then enter the settling tube 301 for processing. settlement.

Further, a first communication pipe is connected to the air outlet of the induced draft fan 203. A second valve 2031 is provided on the end of the first communication pipe away from the induced draft fan 203. The middle part of the first communication pipe passes through the flow meter 205 and the pressure gauge 206 in sequence. It is connected with the lower part of the gas separation pipe 201.

Furthermore, a second communication pipe is connected to the recovery air outlet 3012. A third valve 3014 is provided on the end of the second communication pipe away from the recovery air outlet 3012. The middle part of the second communication pipe is between the air inlet of the induced draft fan 203. connected through the fourth valve 3015.

The settings of the flow meter 205 and the pressure gauge 206 in this application can monitor the gas flow and pressure inside the precision classification device in real time, preventing problems such as poor classification effect or even safety hazard caused by excessive or too small pressure; the first valve 103 The settings of the second valve 2031, the third valve 3014, and the fourth valve 3015 make it easy to adjust the internal air pressure of the classification device before the classification operation, so that the classification effect is better; between the middle part of the second communication pipe and the air inlet of the induced draft fan 203 are connected, so that the air flow at the recovery air outlet 3012 can be recovered and recycled through the air inlet of the induced draft fan 203, effectively saving resources and preventing environmental pollution.

Further, a pressure balance pipe 40 is connected between the top of the gas separation pipe 201 and the silo 101, and a fifth valve 401 is provided on the pressure balance pipe 40. The classification process of the classification device in this application is carried out in a closed manner, in which a safe closed operation is achieved between the feed component 10 and the separation component 20 through the pressure balance pipe 40 and the fifth valve 401 .

Furthermore, the number of third discharge ports 3013 is four. The magnetic carbon black powder deposited at the third outlet 3013 along the direction from the second inlet 3011 to the recovery outlet 3012 is: magnetic carbon black powder a, magnetic carbon black powder b, magnetic carbon black powder c , magnetic carbon black powder d.

In this application, the magnetic carbon black powder is precisely classified through four third discharge ports 3013, where the particle size of magnetic carbon black powder a > the particle size of magnetic carbon black powder b > the particle size of magnetic carbon black powder c Particle size>Particle size of magnetic carbon black powder d. All the magnetic carbon black powder can be settled and classified through the four third discharge ports 3013, and the classification effect is good.

This application also provides a classification method of a magnetic carbon black powder precision classification device, which includes the following steps:

S10, put the mixed carbon black powder into the silo 101, stir the mixed carbon black powder through the stirring component 102, and obtain roughly dispersed mixed carbon black powder;

S20, regulating valve;

Close the first valve 103, the fourth valve 3015 and the fifth valve 401, and open the second valve 2031 and the third valve 3014;

Start the induced draft fan 203, then gradually close the second valve 2031, and gradually open the fourth valve 3015; gradually close the third valve 3014, and gradually open the first valve 103 and the fifth valve 401;

Start the ultrasonic oscillator host and energize the electromagnetic coil 202;

S30, the roughly dispersed mixed carbon black powder is separated into magnetic carbon black powder and non-magnetic carbon black powder in the separation component 20;

The first feed port of the gas separation pipe 201 receives the roughly dispersed mixed carbon black powder discharged from the first discharge port of the silo 101;

Then, the ultrasonic oscillator 204 installed inside the gas separation tube 201 is further dispersed to obtain dispersed and mixed carbon black powder; at the same time, the induced draft fan 203 is used to provide wind force to the inside of the gas separation tube 201;

The magnetic carbon black powder in the dispersed mixed carbon black powder generates an upward force under the action of the electromagnetic coil 202, and the magnetic carbon black powder is transported to the graded settling assembly 30 through the second feed port 3011 along with the air flow;

The non-magnetic carbon black powder in the dispersed mixed carbon black powder is discharged from the second discharge port 2011 due to gravity;

S40, perform graded settling of the magnetic carbon black powder in the graded settling assembly 30;

After the second feed port 3011 receives the air flow and the magnetic carbon black powder, the magnetic carbon black powder is classified through at least two third discharge ports 3013 provided at the bottom of the settling tube 301; the closer to the second feed port 3011 The particle size of the magnetic carbon black powder settled in the third outlet 3013 is larger, and the particle size of the magnetic carbon black powder settled in the third outlet 3013 closer to the recovery outlet 3012 is smaller.

Since the precision classification method provided by this application includes the above-mentioned precision classification device, it can be considered that the precision classification method also includes the beneficial effects of the above-mentioned precision classification device, which will not be described again here.

Further, the following steps are included: S50, after the magnetic carbon black powder is classified and settled, the air flow passes through the recovery air outlet 3012 and the induced draft fan 203 in sequence and then returns to the gas separation pipe 201, and repeats step S30 to recycle the air flow.

The recycling of air flow in this application not only saves resources and conforms to the concept of green environmental protection, but also enables continuous screening and classification of mixed carbon black powder, with higher efficiency.

In order to prove the classification effect of the classification method and classification device provided in this application on magnetic carbon black powder, the particle size of the mixed carbon black powder before classification and the particle size of the magnetic carbon black powder in each third outlet 3013 after classification were compared. diameters were tested. Figure 2 is a particle size distribution diagram of the mixed carbon black powder before classification provided by the embodiment of the present application. It can be seen from Figure 2 that the particle size distribution range of the mixed carbon black powder before classification is wide, between 0.15 and 0.6 μm. After being classified by the classification method and classification device provided by this application, the particle size distribution of the magnetic carbon black powder in the plurality of third discharge ports 3013 is relatively fine. The closer the third discharge port is to the second feed port 3011 The larger the particle size of the magnetic carbon black powder settled in the port 3013 is, the smaller the particle size of the magnetic carbon black powder settled in the third discharge port 3013 is closer to the recycling outlet 3012; Figure 3 shows the implementation of the present application. The particle size distribution diagram of the classified magnetic carbon black powder provided in the example is shown in Figure 3. The magnetic carbon black powder deposited in the third outlet 3013 is along the direction from the second inlet 3011 to the recovery outlet 3012. The particle size gradually decreases, that is, the particle size of magnetic carbon black powder a>the particle size of magnetic carbon black powder b>the particle size of magnetic carbon black powder c>the particle size of magnetic carbon black powder d.

In the description of this application, it should be understood that the terms "length", "upper", "lower", "top", "bottom", "inner", "outer", etc. indicate an orientation or positional relationship based on the attached The orientation or positional relationship shown in the figures is only for the convenience of describing the present application and simplifying the description. It does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present application. Application restrictions.

In addition, the terms “first” and “second” are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of indicated technical features. Therefore, features defined as "first" and "second" may explicitly or implicitly include one or more of these features. In the description of this application, "plurality" means at least two, such as two, three, etc., unless otherwise expressly and specifically limited.

In this application, unless otherwise clearly stated and limited, the terms "installation", "connection", "connection", "fixing" and other terms should be understood in a broad sense. For example, it can be a fixed connection or a detachable connection. , or integrated; it can be mechanical connection, electrical connection or mutual communication; it can be directly connected, or it can be indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

Although the preferred embodiments of the present application have been described, those skilled in the art will be able to make additional changes and modifications to these embodiments once the basic inventive concepts are apparent. Therefore, it is intended that the appended claims be construed to include the preferred embodiments and all changes and modifications that fall within the scope of this application.

Obviously, those skilled in the art can make various changes and modifications to the present application without departing from the spirit and scope of the present application. In this way, if these modifications and variations of the present application fall within the scope of the claims of the present application and equivalent technologies, the present application is also intended to include these modifications and variations.

Claims (8)

1. A magnetic carbon black powder precision classification device, which is characterized in that it includes: The feeding assembly (10) includes a silo (101) and a stirring component (102). The bottom of the silo (101) is provided with a first outlet, and the stirring end of the stirring component (102) extends into the The materials are stirred in the silo (101); The separation component (20) includes a gas separation tube (201), an electromagnetic coil (202) and an induced draft fan (203); the electromagnetic coil (202) is set on the outer wall of the middle part of the gas separation tube (201), and the The air outlet of the induced draft fan (203) is connected with the lower part of the gas separation pipe (201); the top and bottom of the gas separation pipe (201) are respectively provided with a first feed port and a second discharge port (2011 ), the first feed port and the first discharge port are connected through a first valve (103); The graded settling assembly (30) includes a settling tube (301). One end of the settling tube (301) is provided with a second feed port (3011). The second feed port (3011) is connected to the gas separation tube. The upper part of the settling pipe (201) is connected, the other end of the settling pipe (301) is provided with a recovery air outlet (3012), and the bottom of the settling pipe (301) is connected with at least two third outlets in sequence along the length direction. (3013). 2. The magnetic carbon black powder precision classification device according to claim 1, characterized in that an ultrasonic oscillator (204) is provided inside the gas separation tube (201) near the first feed port. ; The ultrasonic oscillator (204) includes an oscillator host and an oscillator probe. One end of the oscillator probe is inserted into the socket of the oscillator host, and the other end of the oscillator probe is located at the first outlet. Right below the material opening. 3. The magnetic carbon black powder precision classification device according to claim 1, characterized in that the air outlet of the induced draft fan (203) is connected with a first communication pipe, and the first communication pipe is away from the A second valve (2031) is provided at one end of the induced draft fan (203), and the middle part of the first communication pipe is connected to the lower part of the gas separation pipe (201) through a flow meter (205) and a pressure gauge (206). . 4. The magnetic carbon black powder precision classification device according to any one of claims 1 to 3, characterized in that the recovery air outlet (3012) is connected with a second communication pipe, and the second communication pipe A third valve (3014) is provided at one end of the top away from the recovery air outlet (3012). The middle part of the second communication pipe is connected to the air inlet of the induced draft fan (203) through a fourth valve (3015). Pass. 5. The magnetic carbon black powder precision classification device according to claim 4, characterized in that a pressure balance pipe (40) is connected between the top of the gas separation pipe (201) and the silo (101). , the pressure balance pipe (40) is provided with a fifth valve (401). 6. The magnetic carbon black powder precision classification device according to claim 5, characterized in that the number of the third discharge ports (3013) is four. 7. A classification method of the magnetic carbon black powder precision classification device according to claim 6, characterized in that it includes the following steps: S10, put the mixed carbon black powder into the silo (101), stir the mixed carbon black powder through the stirring component (102), and obtain a roughly dispersed mixed carbon black powder; S20, regulating valve; Close the first valve (103), the fourth valve (3015) and the fifth valve (401), and open the second valve (2031) and the third valve (3014); Start the induced draft fan (203), then gradually close the second valve (2031), and gradually open the fourth valve (3015); gradually close the third valve (3014), and gradually open the first valve (103) and the fifth valve (401) ; Start the ultrasonic oscillator host and energize the electromagnetic coil (202); S30, the coarsely broken mixed carbon black powder is separated into magnetic carbon black powder and non-magnetic carbon black powder in the separation component (20); The first feed port of the gas separation pipe (201) receives the roughly dispersed mixed carbon black powder discharged from the first discharge port of the silo (101); Then, the ultrasonic oscillator (204) installed inside the gas separation tube (201) is further dispersed to obtain dispersed and mixed carbon black powder; at the same time, the induced draft fan (203) is used to provide wind force for the inside of the gas separation tube (201); The magnetic carbon black powder in the dispersed mixed carbon black powder generates an upward force under the action of the electromagnetic coil (202), and the magnetic carbon black powder is transported to the graded settling assembly (3011) through the second feed port (3011) with the air flow. 30) in; The non-magnetic carbon black powder in the dispersed mixed carbon black powder is discharged from the second discharge port (2011) due to gravity; S40, perform graded settling of the magnetic carbon black powder in the graded settling assembly (30); After the second feed port (3011) receives the air flow and magnetic carbon black powder, the magnetic carbon black powder is classified through at least two third discharge ports (3013) provided at the bottom of the settling tube (301); the closer the The larger the particle size of the magnetic carbon black powder settled in the third outlet (3013) at the second inlet (3011) is, the closer it is to the third outlet (3013) at the recovery outlet (3012). The particle size of the magnetic carbon black powder that settles in the medium is smaller. 8. The classification method of the magnetic carbon black powder precision classification device according to claim 7, characterized in that it also includes the following steps: S50, after the magnetic carbon black powder is classified and settled, the air flow passes through the recovery outlet (3012) and the induced draft fan (203) in sequence and then returns to the gas separation tube (201). Step S30 is repeated to recycle the air flow.