Resistance material mixing and screening system and resistance material preparation method

Abstract

The embodiment of the invention provides a resistor material mixing and screening system and a resistor material preparation method. The resistance material mixing and screening system comprises a first stock bin, a second stock bin and a third stock bin, wherein the first stock bin is used for caching coke raw materials; the first feeder is connected with the first stock bin, and the first feeder is used for conveying the coke raw materials according to a first set frequency; the second stock bin is used for temporarily storing a carburant; the second feeder is connected with the second stock bin, and the second feeder is used for conveying the carburant according to a second set frequency; the first stock bin and the second stock bin are respectively communicated with the mixing receiving hopper, and the mixing receiving hopper is used for receiving the coke raw materials and the carburant; and the mixing and screening equipment is connected with the mixing and receiving hopper, the mixing and screening equipment is used for receiving the coke raw materials and the carburant from the mixing and receiving hopper and mixing and screening the coke raw materials and the carburant to obtain a resistance material and a mixed material, and the particle size of the mixed material is smaller than that of the resistance material.

Description

Technical Field

[0001] The invention relates to the technical field of negative electrode material production, and in particular to a resistor material mixing and screening system and a resistor material preparation method. Background Art

[0002] The negative electrode material Acheson graphitization furnace is an improved furnace type based on the traditional electrode Acheson furnace. When in use, first put the graphite crucible containing the negative electrode material precursor into the graphitization furnace according to the rules, and fill the core of the graphitization furnace with resistors for heating, and fill the outer layer with insulation materials for heat preservation; then a large current is energized, and the resistors heat up to generate a high temperature of 2800℃-3000℃, which indirectly heats the negative electrode material in the crucible, and finally realizes the high-temperature graphitization of the negative electrode material.

[0003] Graphitized resistor material refers to the material that plays the role of "resistance heating" in the Acheson crucible graphitization furnace. It is the main part of graphitization heating and plays a vital role in the graphitization process. Its usage is very large. After the resistor material is graphitized, impurities are discharged to generate a carburizer. The Acheson furnace graphitization furnace usually uses coke particles such as calcined petroleum coke as resistor materials to achieve effective heating.

[0004] Calcined petroleum coke can be divided into high-, medium- and low-sulfur calcined petroleum coke according to the sulfur content. The sulfur in calcined petroleum coke is precipitated in the high-temperature process and forms the atmospheric pollutant SO2 after oxidation. At present, environmental protection requirements are becoming more and more stringent, and the emissions of graphitization furnaces are also required to tend to ultra-low emissions. Therefore, it is urgent to use a large amount of medium- and low-sulfur calcined petroleum coke with low sulfur content as resistor materials. However, the cost of calcined petroleum coke with medium- and low-sulfur content is much higher than that of high-sulfur petroleum coke. In addition, a large amount of production data shows that the furnace core resistor material will be pulverized during the graphitization process, and its high ash content will lead to the obstruction of volatile gas discharge during the high-temperature graphitization process and the compaction of the resistor material, which not only increases the difficulty of removing auxiliary materials and crucibles from the furnace, but also significantly shortens the service life of the crucible and even brings safety risks. Summary of the invention

[0005] Therefore, in order to overcome at least some of the defects and shortcomings in the prior art, an embodiment of the present invention provides a resistor material mixing and screening system and a method for preparing a resistor material.

[0006] Specifically, on the one hand, an embodiment of the present invention provides a resistor material mixing and screening system, comprising: a first silo, the first silo is used to buffer coke raw materials; a first feeder, connected to the first silo, the first feeder is used to convey the coke raw materials at a first set frequency; a second silo, the second silo is used to buffer a carburizer; a second feeder, connected to the second silo, the second feeder is used to convey the carburizer at a second set frequency; a mixing hopper, the first silo and the second silo are respectively connected to the mixing hopper, the mixing hopper is used to receive the coke raw materials and the carburizer; a mixing screening device, connected to the mixing hopper, the mixing screening device is used to receive the coke raw materials and the carburizer from the mixing hopper, and mix and screen to obtain resistor materials and mixed materials, the particle size of the mixed material is smaller than the particle size of the resistor material.

[0007] In a specific embodiment of the present invention, the particle sizes of the coke raw material and the recarburizer are both less than 25 mm, the particle size of the resistor material is 8 to 25 mm, and the particle size of the mixed material is less than 8 mm.

[0008] In a specific embodiment of the present invention, the mixing and screening equipment includes: a bracket; a mixing and screening barrel, rotatably connected to the bracket, the mixing and screening barrel is a barrel-shaped structure with openings at both ends, and the mixing and screening barrel has a first end and a second end relative to each other, and the mixing and screening barrel is used to mix and screen the coke raw material and the carburizer; a feed port, arranged at the first end and connected to the mixing and screening barrel, the feed port is used to transport the coke raw material and the carburizer in the mixing hopper into the mixing and screening barrel; a first discharge port, connected between the first end and the second end, the first discharge port is used to transport the screened mixed material; a second discharge port, arranged at the second end and connected to the mixing and screening barrel, the second discharge port is used to transport the resistor material that has passed the screening.

[0009] In a specific embodiment of the present invention, the mixing screening barrel is transversely arranged on the bracket, the second end of the mixing screening barrel is tilted downward, and the angle between the length direction of the mixing screening barrel and the horizontal line is 5 to 10 degrees.

[0010] In a specific embodiment of the present invention, the mixing and screening barrel includes: an outer shell; and a screen cylinder, which is arranged in the outer shell, and a spacing space is provided between the screen cylinder and the outer shell, the screen cylinder includes a mixing section and a screening section, the mixing section is arranged close to the first end, and a shoveling plate is provided on the inner wall of the mixing section.

[0011] In a specific embodiment of the present invention, the resistor material mixing and screening system further includes: a crusher connected to the first discharge port, the crusher is used to crush the mixed material to obtain crushed material, and the particle size of the crushed material is less than 2 mm.

[0012] In a specific embodiment of the present invention, the first end of the mixed screening barrel is also provided with an air outlet; the resistor material mixed screening system also includes: a dust collector, which is connected to the air outlet and is used for exhausting and collecting dust.

[0013] On the other hand, an embodiment of the present invention also provides a method for preparing a resistor material, comprising: a conveying step: conveying the coke raw material and the recarburizer to a mixing and screening device according to a preset ratio; a mixing and screening step: the mixing and screening device mixes the coke raw material and the recarburizer and screens them to obtain a resistor material and a mixed material, wherein the particle size of the mixed material is smaller than the particle size of the resistor material.

[0014] In a specific embodiment of the present invention, the particle sizes of the coke raw material and the recarburizer are both less than 25 mm, the particle size of the resistor material is 8-25 mm, and the particle size of the mixed material is less than 8 mm; the amount of the coke raw material accounts for 30% to 100% of the total amount of the coke raw material and the recarburizer.

[0015] In a specific embodiment of the present invention, after the mixing and screening step, the method further includes: a crushing step: crushing the mixed material to obtain a crushed material, wherein the particle size of the crushed material is less than 2 mm.

[0016] As can be seen from the above, the resistor material mixing and screening system provided by the embodiment of the present invention is provided with two silos to buffer the coke raw materials and the recarburizer, and two feeders are provided to deliver the coke raw materials and the recarburizer of the preset proportion to the mixing hopper according to the set frequency, and then deliver them to the mixing and screening equipment. The materials pass through the mixing section and the screening section of the mixing and screening equipment in turn, and the coke raw materials and the recarburizer are fully mixed through the mixing section, and the large and small particles in the coke raw materials and the recarburizer are separated through the screening section to obtain a mixture of large particles of resistor material and small particles. By mixing the coke raw materials and the recarburizer, the sulfur content of the resistor material can be reduced, and the uniformity of the resistor material can be ensured, thereby achieving the uniformity of conductivity and heat generation during the graphitization process; by screening the mixture of the coke raw materials and the recarburizer, the fine powder particles are screened out, so that the fine powder content in the resistor material is reduced, and the resistor material is prevented from being compacted during the high-temperature graphitization process, thereby improving the production quality and safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0018] Figure 1 A schematic diagram of the structure of a resistor material mixed screening system provided in an embodiment of the present application.

[0019] Figure 2 for Figure 1 Schematic diagram of some structures in the resistor material mixed screening system.

[0020] Figure 3 for Figure 2 Schematic diagram of the structure of the medium mixing and screening equipment.

[0021] Figure 4 for Figure 3 Schematic diagram of the cross-sectional structure of the screen drum mixing section in the mixing and screening equipment.

[0022] Figure 5 A schematic flow chart of a method for preparing a resistor material provided in an embodiment of the present invention.

[0023] Figure 6 Another schematic diagram of the process of preparing the resistor material provided by the embodiment of the present invention.

[0024] Main component numbers:

[0025] 11. First silo; 12. Second silo; 21. First feeder; 22. Second feeder; 30. Mixing hopper; 40. Elevator; 50. Mixing and screening equipment; 51. Bracket; 52. Mixing and screening barrel; 501. Second end; 502. First end; 511. Feed inlet; 512. First discharge outlet; 513. Second discharge outlet; 521. Outer shell; 5211. Interval; 522. Screen drum; 5221. Mixing section; 5222. Screening section; 52211. Copying board; 61. Feed hopper; 62. Discharger; 63. Ton bag; 64. Weighing scale; 70. Crusher; 80. Dust collector. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments described in the present invention, all other embodiments obtained by ordinary technicians in this field without creative work belong to the protection scope of the present invention.

[0027] It should be noted that all directional indications (such as up, down, left, right, front, back, top, and bottom) in the embodiments of the present invention are only used to explain the relative position relationship, movement, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly. In addition, the term "vertical" involved in the embodiments of the invention and the claims means that the angle between the two elements is 90° or there is a deviation of -5° to +5°, and the term "parallel" involved means that the angle between the two elements is 0° or there is a deviation of -5° to +5°.

[0028] In the embodiments of the present invention, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of the features.

[0029] See also Figure 1 and Figure 2 An embodiment of the present invention provides a resistor material mixing and screening system, which may, for example, include: a first silo 11, a second silo 12, a first feeder 21, a second feeder 22, a mixing hopper 30 and a mixing and screening device 50.

[0030] The first silo 11 is used to buffer the coke raw material, and the second silo 12 is used to buffer the carburizer. In this embodiment, the coke raw material can be, for example, calcined petroleum coke or metallurgical coke, or other types of coke raw materials, and the carburizer can be, for example, the product of graphitization of resistor material. The first feeder 21 is connected to the first silo 11, and the first feeder 21 is used to convey the coke raw material according to the first set frequency. The second feeder 22 is connected to the second silo 12, and the second feeder 22 is used to convey the carburizer according to the second set frequency. The first feeder 21 and the second feeder 22 can be, for example, disc feeders. Through the arrangement of the first feeder 21 and the second feeder 22, the coke raw material and the carburizer can be conveyed according to a preset ratio. The first silo 11 and the second silo 12 are respectively connected to the mixing hopper 30 to convey the coke raw material and the carburizer to the mixing hopper 30 according to a preset ratio. The mixing hopper 30 is connected to the mixing and screening device 50, which is used to receive the coke raw materials and the carburizer from the mixing hopper 30, and mix and screen the coke raw materials and the carburizer in a preset proportion to obtain resistor materials and mixed materials, wherein the particle size of the mixed material is smaller than the particle size of the resistor material.

[0031] The resistor material mixed screening system provided by the embodiment of the present invention is provided with two silos to buffer the coke raw materials and the recarburizer, and two feeders are provided to convey the coke raw materials and the recarburizer in a preset proportion to the mixing hopper 30 at a set frequency, and convey them to the mixing screening equipment 50 for mixed screening to obtain the resistor material and the mixed material. By mixing the coke raw materials and the recarburizer, the sulfur content of the resistor material can be reduced, and the uniformity of the resistor material can be ensured, thereby achieving the uniformity of conductivity and heat generation during the graphitization process; and screening the mixture of the coke raw materials and the recarburizer can screen out the fine powder particles, thereby reducing the fine powder content in the resistor material, avoiding the compaction of the resistor material during the high-temperature graphitization process, and improving the production quality and safety.

[0032] In one implementation of this embodiment, the particle sizes of the coke raw material and the recarburizer are both less than 25 mm, the particle size of the resistor material is 8 to 25 mm, and the particle size of the mixed material is less than 8 mm. The mixed material of the resistor material obtained after the coke raw material and the recarburizer are mixed and screened has different particle sizes. Screening can prevent the resistor material from containing fine powder with too small a particle size, thereby avoiding the occurrence of agglomeration of the resistor material during high-temperature graphitization and improving production quality and safety.

[0033] See also Figure 3 , the mixing and screening device 50 may include, for example, a support 51, a mixing and screening barrel 52, a feed port 511, a first discharge port 512, and a second discharge port 513. The mixing and screening barrel 52 is rotatably connected to the support 51, and the mixing and screening barrel 52 is a barrel-mounted structure with openings at both ends, and the mixing and screening barrel 52 has a first end 502 and a second end 501 opposite to each other, and the mixing and screening barrel 52 is used to mix and screen the coke raw material and the carburizer. The feed port 511 is provided on the first end 502, and the feed port 511 is connected to the mixing and screening barrel 52, and the feed port 511 is used to transport the coke raw material and the carburizer of the mixing hopper 30 into the mixing and screening barrel 52. The first discharge port 512 is connected between the first end 502 and the second end 501, and the first discharge port 512 is used to transport the screened mixed material. The second discharge port 513 is disposed at the second end 501 and is connected to the mixing and screening barrel 52 . The second discharge port 513 is used to convey the resistor material that has passed the screening.

[0034] In one implementation of this embodiment, the mixing and screening barrel 52 is transversely arranged on the bracket 51, and the second end 501 of the mixing and screening barrel 52 is tilted downward, and the angle between the length direction of the mixing and screening barrel 52 and the horizontal line is 5 to 10 degrees. By tilting the mixing and screening barrel 52, the material can flow downward after being mixed and screened in the mixing and screening barrel 52, thereby improving fluidity, and also preventing the material from flowing too fast when the tilt angle is too large, thereby preventing the material from being blocked, thereby further improving the efficiency of mixed screening.

[0035] Furthermore, the mixed screening barrel 52 may include, for example, an outer shell 521 and a screen drum 522. The screen drum 522 is disposed in the outer shell, and a spacing space 5211 is disposed between the screen drum 522 and the outer shell 521. The outer shell 521 may be, for example, a sealed shell, which can prevent dust from leaking through the sealed setting. The screen drum 522 may be, for example, provided with a plurality of evenly distributed screening meshes to retain materials of qualified particle sizes on the screen, i.e., in the barrel, and then flow out through the second discharge port 513. The mixed materials of unqualified particle sizes fall into the spacing space 5211 after passing through the screen, and then flow out through the connection to the first discharge port 512. The screen drum 522 includes a mixing section 5221 and a screening section 5222. The mixing section 5221 is disposed close to the first end 502. See FIG. Figure 4 , a lifting plate 52211 is provided on the inner wall of the mixing section 5221, and the mixing section 5221 may not be provided with a sieve hole, for example. By providing the lifting plate 52211 in the mixing section 5221, the coke raw material and the carburizer can be fully mixed after entering the mixing section 5221 and then screened through the screening section 5222, which can improve the mixing uniformity. By not providing the sieve hole in the mixing section 5221, it can be ensured that materials of all particle sizes are mixed uniformly, that is, it can be ensured that the mixed materials with a particle size less than 8 mm are also mixed uniformly. In another implementation of the present embodiment, the entire section of the sieve drum 522 may, for example, be provided with a lifting plate 52211, that is, the inner walls of the mixing section 5221 and the screening section 5222 are provided with a lifting plate 52211. By providing the lifting plate 52211, mixing and conveying can be performed throughout the entire process of mixing and screening; the mixing section 5221 may, for example, not be provided with sieve holes. By not providing sieve holes in the mixing section 5221, it can be ensured that materials of all particle sizes are mixed evenly, that is, it can be ensured that the mixed materials with a particle size less than 8 mm are also mixed evenly.

[0036] See also Figure 1 and Figure 2 For example, an elevator 40 may be further provided between the mixing hopper 30 and the mixing and screening device 50, and the coke raw material and the carburizer in the mixing hopper 30 may be transported to the mixing and screening device 50 by the elevator 40. The elevator 40 may be, for example, a plate chain bucket elevator.

[0037] In one implementation of this embodiment, the resistor material mixing and screening system may further include a crusher 70, which is connected to the first discharge port 512. The crusher 70 is used to crush the mixed material to obtain a crushed material, and the particle size of the crushed material is less than 2 mm. Through the setting of the crusher 70, the mixed material can be crushed, and the crushed material can be used as a heat preservation material for the graphitization furnace, which can improve the utilization rate.

[0038] See also Figure 3The first end 502 of the mixed screening barrel 52 is also provided with an air outlet 514. The resistor material mixed screening system also includes a dust collector 80, which is connected to the air outlet 514. The dust collector 80 is used for exhaust and dust collection. The second discharge port 513 may be, for example, also connected to a receiving hopper 61, and a discharger 62 may be, for example, also connected to the receiving hopper 61, and a ton bag 63 and a floor scale 64 may be connected below the discharger 62 to package and weigh the resistor material flowing out of the second discharge port 513. Similarly, the crusher 70 may also be, for example, connected to a receiving hopper 61, and a discharger 62 may be, for example, also connected to the receiving hopper 61, and a ton bag 63 and a floor scale 64 may be connected below the discharger 62 to package and weigh the crushed material flowing out of the first discharge port 512.

[0039] See also Figure 5 The embodiment of the present invention further provides a method for preparing a resistor material, which is applied to the above-mentioned resistor material mixing and screening system. The resistor material can be prepared by the resistor material mixing and screening system. The method for preparing the resistor material specifically includes:

[0040] S10, conveying step: conveying the coke raw material and the carburizer to the mixing and screening equipment according to a preset ratio;

[0041] S20, mixing and screening step: the mixing and screening equipment mixes the coke raw material and the recarburizer and screens them to obtain a resistor material and a mixed material, wherein the particle size of the mixed material is smaller than the particle size of the resistor material.

[0042] Specifically, for example, the coke raw material and the recarburizer can be transported to the mixing and screening equipment 50 through the mixing hopper 40 according to a preset ratio for mixing and screening, and the resistor material and the mixed material of different particle sizes are obtained by the mixing and screening of the mixing and screening equipment 50. Among them, the particle size of the coke raw material and the recarburizer are both less than 25mm, the particle size of the resistor material is 8-25mm, and the particle size of the mixed material is less than 8mm. The preset ratio can be, for example, 1:1, 1:1.5 or 3:2, which can be set according to actual needs. The amount of the coke raw material in the total amount of the coke raw material and the recarburizer can be, for example, 30% to 100%. When the coke raw material accounts for 100%, it does not contain a recarburizer, and can, for example, only be mixed and screened to make the different particle sizes of the coke raw materials evenly mixed and screen out small particles of materials. After the resistor material is charged into the graphitization furnace, powered on, cooled and discharged from the furnace, it is screened to obtain a recarburizer with a specification of 8-25 mm. The recarburizer can be recycled, thereby further reducing the transportation and use costs.

[0043] See also Figure 6 After the mixing and screening step in S20, the following steps may be further included:

[0044] S30, crushing step: crushing the mixed material to obtain a crushed material, wherein the particle size of the crushed material is less than 2 mm. For example, the mixed material can be crushed by a crusher 70 to obtain a crushed material, wherein the particle size of the crushed material is less than 2 mm. By crushing the mixed material, the crushed material can be used as a heat preservation material for the graphitization furnace, thereby improving the utilization rate.

[0045] In order to facilitate understanding of the effect of the method for preparing the resistor material provided in this embodiment, a specific description is given below in conjunction with specific experimental examples.

[0046] Experimental example:

[0047] (1) Set the weight ratio of mixed screen resistor material: coke raw material and carburizer to 1:1

[0048] (2) The basic information of the experimental furnace and the control furnace is as follows:

[0049] Furnace weight Resistor material type Resistor weight Power consumption Desulfurization agent consumption Experimental furnace 128 tons Mixed screening 85 tons 8085.90 5.6 tons Control furnace 125 tons New Materials 86 tons 8162.83 8 tons

[0050] Test results and analysis:

[0051] 1. The impact of mixed-screen resistor materials on production costs

[0052] Mixed-screened resistor material is mixed and screened by calcined petroleum coke and carburizer in a ratio of 1:1. The weight of each furnace is 85 tons. The use of mixed-screened resistor material reduces the use of new materials by 50%. According to the sales price of carburizer and the purchase price of calcined petroleum coke, the cost of using resistor auxiliary materials is reduced by about 40% per furnace, and the purchase and transportation cost is reduced by 50%. The results show that mixed-screened resistor material can effectively save production costs.

[0053] 2. The influence of mixed-screen resistor materials on flue gas emissions

[0054] According to the on-site observation results of the experimental furnaces, during the graphitization production process, the flue gas emissions of the furnaces using mixed-screen resistor materials are less than those of the furnaces using all new resistor materials. According to the amount of desulfurizer used, it can be inferred that the actual sulfur content emissions of the furnaces using mixed-screen resistor materials are less than those of other furnaces. During the cooling process, the unorganized emission of flue gas is significantly reduced.

[0055] 3. Improvement of the resistance material hardening phenomenon by mixed screening resistance material

[0056] After mixed screening of resistor materials, petroleum coke and petroleum coke fine powder that are not in the 8-25mm particle size range can be screened and packaged separately, ensuring the particle size requirements of the resistor materials used in the furnace. The results of the comparative experiment furnaces show that after using mixed screening resistor materials, there is no resistance material caking phenomenon during the cooling and unloading process, which reduces the difficulty of cooling and unloading operation of the suction crane, and increases the suction efficiency of the suction crane and the unloading operation efficiency.

[0057] Therefore, the resistor material is prepared by mixed screening through the resistor material mixed screening system and the resistor material preparation method provided by the embodiment of the present invention. Two silos are set to cache the coke raw materials and the recarburizer, and two feeders are set to deliver the coke raw materials and the recarburizer of the preset proportion to the mixing hopper 30 according to the set frequency, and then delivered to the mixed screening equipment 50 for mixed screening to obtain the resistor material and the mixed material. The sulfur content of the resistor material can be reduced by mixing the coke raw materials and the recarburizer, and the fine powder particles can be screened out by mixed screening of the coke raw materials and the recarburizer, so that the fine powder content in the resistor material is reduced, and the resistor material is prevented from being compacted during the high-temperature graphitization process, thereby improving the production quality and safety. In addition, the mixed screening resistor material can effectively reduce the production cost, and the resistor material entering the furnace can reduce the exhaust gas emission and reduce the desulfurization pressure, which can effectively achieve cost reduction and efficiency improvement in graphitization production applications.

[0058] In addition, it can be understood that the aforementioned embodiments are only exemplary descriptions of the present invention. Under the premise that the technical features do not conflict, the structures do not contradict, and the purpose of the present invention is not violated, the technical solutions of the various embodiments can be arbitrarily combined and used in combination.

[0059] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A resistor material mixed screening system, characterized in that: include: A first silo, wherein the first silo is used to buffer coke raw materials; a first feeder connected to the first silo, the first feeder being used to convey the coke raw material at a first set frequency; A second silo, the second silo is used to buffer the carburant; a second feeder connected to the second silo, the second feeder being used to deliver the carburizer at a second set frequency; A mixing hopper, the first silo and the second silo are respectively connected to the mixing hopper, and the mixing hopper is used to receive the coke raw material and the carburizer; A mixing and screening device is connected to the mixing hopper, and is used to receive the coke raw material and the carburizer from the mixing hopper, and perform mixing and screening to obtain a resistor material and a mixed material, wherein the particle size of the mixed material is smaller than the particle size of the resistor material.

2. The resistor material mixed screening system according to claim 1, characterized in that: The particle sizes of the coke raw material and the recarburizer are both less than 25 mm, the particle size of the resistor material is 8 to 25 mm, and the particle size of the mixed material is less than 8 mm.

3. The resistor material mixed screening system according to claim 1, characterized in that: The mixed screening equipment comprises: Bracket; A mixing and screening barrel is rotatably connected to the bracket, the mixing and screening barrel is a barrel structure with openings at both ends, and the mixing and screening barrel has a first end and a second end opposite to each other, and the mixing and screening barrel is used to mix and screen the coke raw material and the carburizer; A feed inlet, which is arranged at the first end and connected to the mixing and screening barrel, and is used to transport the coke raw material and the carburizer in the mixing hopper into the mixing and screening barrel; A first discharge port, connected between the first end and the second end, the first discharge port being used to convey the screened mixed material; The second discharge port is arranged at the second end and connected to the mixed screening barrel. The second discharge port is used to transport the resistor material that has passed the screening.

4. The resistor material mixed screening system according to claim 3, characterized in that: The mixing and screening barrel is transversely arranged on the bracket, the second end of the mixing and screening barrel is tilted downward, and the angle between the length direction of the mixing and screening barrel and the horizontal line is 5 to 10 degrees.

5. The resistor material mixed screening system according to claim 4, characterized in that: The mixed screening barrel comprises: an outer shell; and The sieve drum is arranged in the outer shell, and a spacing space is arranged between the sieve drum and the outer shell. The sieve drum includes a mixing section and a screening section. The mixing section is arranged close to the first end, and a shoveling plate is arranged on the inner wall of the mixing section.

6. The resistor material mixed screening system according to claim 3, characterized in that: Also includes: A crusher is connected to the first discharge port, and is used for crushing the mixed material to obtain crushed material, wherein the particle size of the crushed material is less than 2 mm.

7. The resistor material mixed screening system according to claim 3, characterized in that: The first end of the mixed screening barrel is also provided with an air outlet; the resistor material mixed screening system further comprises: A dust collector is connected to the air outlet and is used for exhausting air and collecting dust.

8. A method for preparing a resistor material, characterized in that: include: Conveying step: conveying the coke raw material and the carburizer to the mixing and screening equipment according to a preset ratio; Mixing and screening step: the mixing and screening equipment mixes the coke raw material and the carburizer and screens them to obtain a resistor material and a mixed material, wherein the particle size of the mixed material is smaller than the particle size of the resistor material.

9. The method for preparing a resistor material according to claim 8, characterized in that: The particle sizes of the coke raw material and the recarburizer are both less than 25 mm, the particle size of the resistor material is 8-25 mm, and the particle size of the mixed material is less than 8 mm; the amount of the coke raw material accounts for 30% to 100% of the total amount of the coke raw material and the recarburizer.

10. The method for preparing a resistor material according to claim 9, characterized in that: After the mixing and screening step, the method further comprises: Crushing step: crushing the mixed material to obtain a crushed material, wherein the particle size of the crushed material is less than 2 mm.

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