CN115554910B - Preparation process of negative electrode material - Google Patents

Abstract

The invention discloses a preparation process of a cathode material, wherein a preparation device adopted in the preparation process comprises a pretreatment mechanism, a crushing mechanism, a mixing mechanism, a granulating mechanism, a grinding mechanism, a graphitization treatment mechanism and a sieving and demagnetizing mechanism, the pretreatment mechanism comprises a shifting assembly and a feeding and discharging assembly, the feeding and discharging assembly further comprises a driving module, and the preparation process comprises the following steps of S1: screening pretreatment, S2: mixing and S3: granulating and S4: according to the invention, dust and impurities generated by automatic cleaning and screening are realized through a shifting component and a cleaning belt in the pretreatment mechanism, and meanwhile, the automatic feeding and discharging of petroleum coke are realized through a feeding and discharging component, so that the pretreatment efficiency of the petroleum coke is improved; quick granulation is realized through the granulation belt, the blanking roller and the pressing roller, and the curing hardening time of the mixture granulation particles is shortened by matching with a low-temperature box and a vibrator, so that the granulation efficiency is improved.

Description

Preparation process of negative electrode material

Technical Field

The invention relates to the technical field of preparation of negative electrode materials, in particular to a preparation process of a negative electrode material.

Background

The cathode refers to one end of a power supply, which has lower potential, the primary battery refers to an electrode which has oxidation reaction and is one electrode losing electrons, the cathode material of the lithium ion battery is usually two major types of carbon materials and non-carbon materials, the carbon materials mainly comprise graphite type, non-graphite type and nano-structure carbon-based cathode materials, and the carbon materials have the characteristics of environmental friendliness, low cost, high specific capacity, good cycle performance, long service life, low chemical potential and the like, wherein the graphite is the cathode material with the highest commercialization degree at present.

At present, the main production method of the non-natural graphite is to carry out high-temperature graphitization treatment on raw materials such as petroleum coke or asphalt to obtain graphite, however, the graphite produced by graphitization treatment on the petroleum coke or asphalt is defective, the petroleum coke is in a porous stacking state, a large amount of dust and other impurities are mixed and are difficult to separate, so that the resistivity of the produced graphite is large, the asphalt is solid at normal temperature, and becomes liquid after high temperature during graphitization treatment, so that the graphite is not suitable for large-scale treatment in a graphitization treatment furnace, the yield of the graphite is limited, and large-scale graphitization production by using the asphalt is not possible.

Disclosure of Invention

The invention aims to provide a preparation process of a negative electrode material, which aims to solve the problems in the prior art.

In order to achieve the above purpose, the present invention provides the following technical solutions:

the preparation device comprises a pretreatment mechanism, a crushing mechanism, a mixing mechanism, a granulating mechanism, a grinding mechanism, a graphitization treatment mechanism and a sieving and demagnetizing mechanism;

the pretreatment mechanism comprises a screening cylinder, connecting rods are uniformly arranged on the outer side of the screening cylinder, side discs are arranged at the two ends of the screening cylinder, one side of each side disc is connected with a rotating motor, the pretreatment mechanism further comprises a shifting assembly, the shifting assembly comprises a horizontal guide rail frame, the horizontal guide rail frame is connected with a bracket, the horizontal guide rail frame is arranged at the two ends of the screening cylinder, the screening cylinder is slidably mounted between the screening cylinder and the horizontal guide rail frame, a movable frame is slidably mounted on the horizontal guide rail frame, one end of the movable frame is fixedly mounted between the rotating motor, a travelling motor is arranged on the horizontal guide rail frame, the travelling motor is connected with an output shaft, racks are arranged on the horizontal guide rail frame, a matched gear is arranged at the position of the output shaft corresponding to the racks, the matched gear is meshed with the racks, a cleaning belt is arranged under the moving track of the screening cylinder, the cleaning belt is connected with a belt roller, the belt roller is rotatably mounted between the belt roller and the bracket, and a guide plate is arranged above the cleaning belt;

the grinding mechanism is arranged right below one end of the horizontal guide rail frame and comprises a grinding box, grinding rollers are arranged in the grinding box and are symmetrically arranged, grinding rollers are arranged on the lower side of the grinding rollers and are symmetrically arranged, the bottom of the grinding box is connected with the mixing mechanism which comprises a stirring barrel, an asphalt pipe is further connected onto the stirring barrel, the bottom of the stirring barrel is connected with the granulating mechanism, the granulating mechanism is connected with the grinding mechanism, the grinding mechanism is connected with the graphitization treatment mechanism through a conveying pipe and a conveying pump, and the graphitization treatment mechanism is connected with the sieving and demagnetizing mechanism;

the preparation process comprises the following steps:

s1, screening pretreatment, namely conveying petroleum coke into a screening cylinder, starting a rotating motor connected with the screening cylinder to drive the screening cylinder to rotate, so that the petroleum coke in the screening cylinder is subjected to rolling screening, dust and other impurity particles in the petroleum coke are separated, and the screened petroleum coke is released into a crushing mechanism;

s2, mixing materials, namely, after petroleum coke enters a crushing mechanism to be crushed, the petroleum coke falls into a stirring barrel in the mixing mechanism, and asphalt which is in a liquid state after being heated is led into the stirring barrel by combining an asphalt pipe arranged on the stirring barrel, so that the petroleum coke crushed aggregates and the asphalt are stirred and mixed in the stirring barrel to form a sludge-shaped mixture, and the mixture is sent into a granulating mechanism after stirring is completed;

s3, granulating, namely dispersing the petroleum coke and asphalt mixture into granular solids with the same specification through a granulating mechanism, then conveying the granular solids into a grinding mechanism to grind the granular solids into powder, conveying the powder into a graphitization treatment mechanism along a conveying pipe, and keeping the temperature in the graphitization treatment mechanism between 3000 ℃ and 3400 ℃ and heating for 24 to 72 hours;

and S4, sieving and demagnetizing the powder after graphitization treatment.

As a further scheme of the invention: the screening section of thick bamboo still is provided with feeding and discharging components, feeding and discharging components is including setting up the feed chute on the side disc, the feed chute outside is provided with the charge plate, be provided with the guide way on the side disc, the charge plate passes through guide way slidable mounting, the guide way arc sets up, the centre of a circle of guide way coincides each other with the gyration center of side disc.

As still further aspects of the invention: the feeding and discharging assembly comprises a screening cylinder, and is characterized in that the feeding and discharging assembly further comprises a discharging groove arranged on the screening cylinder, arc-shaped mounting grooves are formed in the side disc, a closed arc-shaped plate is mounted between the arc-shaped mounting grooves in a sliding mode, the inner side of the closed arc-shaped plate is tangent to the connecting rod, a mounting column is arranged at the end portion of the closed arc-shaped plate, and the closed arc-shaped plate is mounted in a sliding mode between the mounting column and the arc-shaped mounting grooves.

As still further aspects of the invention: the feeding and discharging assembly comprises a feeding and discharging assembly and is characterized in that the feeding and discharging assembly further comprises a driving module, a sealing spring is arranged in the guide groove, a jacking spring is arranged in the arc-shaped mounting groove, an extension column is arranged on one side, far away from the jacking spring, of the sealing arc-shaped plate, a linkage frame is sleeved on the rotary axis of the screening cylinder, the linkage frame is in contact with the extension column, a driving frame is arranged on the side disc, the driving frame is in arc-shaped arrangement, and two ends of the driving frame are respectively in contact with the edges of the linkage frame and the feeding plate.

As still further aspects of the invention: the grinding rollers are symmetrically arranged, and the grinding rollers on the same side are respectively driven by a belt.

As still further aspects of the invention: the granulating mechanism comprises a receiving hopper, a discharging roller is arranged in the receiving hopper, the discharging rollers are symmetrically arranged, a granulating belt is arranged below the discharging roller, granulating grooves are uniformly formed in the granulating belt, a pressing roller is arranged on the upper side of the granulating belt, a supporting roller is correspondingly arranged on the other side of the granulating belt, the granulating belt is arranged in a triangular shape, a low-temperature box is arranged on the horizontal section of the granulating belt, and a vibrator is arranged on the inclined section of the granulating belt in a matched mode.

As still further aspects of the invention: the sieving and demagnetizing mechanism comprises a vibrating screen arranged between the graphitizing treatment mechanism and a demagnetizing cylinder, a vibrating motor is arranged at the bottom of the demagnetizing cylinder and connected with a vibrating rod, the tail end of the vibrating rod is in contact with the vibrating screen, a blanking disc is arranged on the vibrating rod, an electromagnet is arranged in the blanking disc, an inclined guide plate is arranged at the lower side of the demagnetizing cylinder, and a discharge pipe is arranged at the lowest position of the guide plate.

As still further aspects of the invention: the blanking disc is in a conical shape, spiral grooves are formed in the upper surface of the blanking disc, two groups of blanking discs are arranged, a downward concave guide hopper is arranged between the blanking discs, a guide hole is formed in the middle of the guide hopper, and the edge of the guide hopper is fixedly connected with the demagnetizing cylinder.

Compared with the prior art, the invention has the beneficial effects that:

(1) According to the invention, the horizontal guide rail frame and the shifting assembly are arranged, so that the position of the screening cylinder is adjusted, and dust and impurities can be cleaned by matching with the cleaning belt when petroleum coke screening pretreatment is carried out; the treated petroleum coke is mixed with heated liquid asphalt for granulation after being crushed and ground by a crushing mechanism, and the mixture is used as a raw material for preparing the anode material, so that the defect that the anode material is prepared by independently using petroleum coke or asphalt is overcome, the preparation yield is improved, and the preparation difficulty is reduced;

(2) The quick feeding and discharging operation of the screening cylinder is realized by arranging the feeding and discharging assembly, so that the efficiency of petroleum coke screening pretreatment can be effectively improved;

(3) The rapid granulation is realized through the granulating belt, the blanking roller and the pressing roller, and the curing hardening time of the mixture particles is shortened by matching with a low-temperature box and a vibrator, so that the granulating efficiency is improved;

(4) And the vibrating screen is driven to vibrate by the vibrating motor to finish graphite screening, and the blanking disc is driven to vibrate for blanking, so that the demagnetization effect and the demagnetization efficiency are ensured by matching with the spiral groove.

Drawings

Fig. 1 is a schematic structural diagram of a process for preparing a negative electrode material.

Fig. 2 is a schematic structural diagram of a pretreatment mechanism in a preparation process of a negative electrode material.

Fig. 3 is a schematic structural diagram of a displacement assembly in a process for preparing a negative electrode material.

Fig. 4 is a schematic diagram of a combined structure of a feeding and discharging assembly and a sieving cylinder in a preparation process of a negative electrode material.

Fig. 5 is a schematic diagram of a separation structure of a feeding and discharging assembly and a sieving cylinder in a preparation process of a negative electrode material.

Fig. 6 is a schematic view of an installation structure of a closed arc plate in a preparation process of a negative electrode material.

Fig. 7 is a schematic diagram of a connection structure between a pulverizing mechanism and a stirring barrel in a preparation process of a negative electrode material.

Fig. 8 is a schematic structural view of a pulverizing mechanism in a process for preparing a negative electrode material.

Fig. 9 is a schematic structural diagram of a granulating mechanism in a preparation process of a negative electrode material.

Fig. 10 is a schematic diagram of the internal structure of a demagnetizing cylinder in the preparation process of the negative electrode material.

In the figure: 1. a pretreatment mechanism; 2. a crushing box; 20. a pulverizing roller; 21. a grinding roller; 22. crushing cone; 3. a stirring barrel; 30. an asphalt pipe; 4. a granulating mechanism; 40. a receiving hopper; 41. a blanking roller; 42. a granulating tank; 43. a material pressing roller; 44. a support roller; 45. a low temperature box; 46. a vibrator; 5. a grinding mechanism; 6. a delivery tube; 60. a transfer pump; 7. a graphitization treatment mechanism; 70. a vibrating screen; 8. a demagnetizing cylinder; 80. a blanking disc; 81. a spiral groove; 82. a guide hopper; 83. a material guiding hole; 84. a material guide plate; 85. a vibration motor; 86. a vibrating rod; 88. a discharge pipe; 100. a sieving cylinder; 1000. a discharge chute; 101. a connecting rod; 102. a side disc; 103. a rotating electric machine; 104. a moving rack; 105. a horizontal guide rail frame; 106. a rack; 107. an output shaft; 108. a mating gear; 109. a walking motor; 1010. cleaning the belt; 1011. a guide plate; 1012. a bracket; 110. a closed arc plate; 1101. an arc-shaped mounting groove; 1102. a feed plate; 1103. a linkage frame; 1104. a drive rack; 1105. a feed chute; 1106. a guide groove; 1107. a spring is tightly propped; 1108. a mounting column; 1109. sleeving a column; 1110. and (5) extending the column.

Detailed Description

In the description of the present invention, it should be understood that the terms "longitudinal," "transverse," "upper," "lower," "top," "bottom," "inner," "outer," and the like indicate or are based on the orientation or positional relationship shown in the drawings, merely to facilitate description of the invention and to simplify the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the invention.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present invention, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.

In the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.

The technical scheme of the patent is further described in detail below with reference to the specific embodiments.

As shown in fig. 1 to 10, a preparation process of a negative electrode material, wherein a preparation device adopted in the preparation process comprises a pretreatment mechanism 1, a crushing mechanism, a mixing mechanism, a granulating mechanism 4, a grinding mechanism 5, a graphitization treatment mechanism 7 and a sieving and demagnetizing mechanism;

as shown in fig. 2 and 3, the pretreatment mechanism 1 comprises a screening cylinder 100, a connecting rod 101 is uniformly arranged at the outer side of the screening cylinder 100, side discs 102 are arranged at two ends of the screening cylinder 100, one side of the side discs 102 is connected with a rotating motor 103, the pretreatment mechanism further comprises a displacement assembly, the displacement assembly comprises a horizontal guide rail frame 105, the horizontal guide rail frame 105 is connected with a bracket 1012, the horizontal guide rail frame 105 is arranged at two ends of the screening cylinder 100, the screening cylinder 100 and the horizontal guide rail frame 105 are slidably mounted, a movable frame 104 is slidably mounted on the horizontal guide rail frame 105, one end of the movable frame 104 is fixedly mounted between the rotating motor 103, a traveling motor 109 is arranged on the horizontal guide rail frame 105, the traveling motor 109 is connected with an output shaft 107, a rack 106 is arranged on the horizontal guide rail frame 105, a matched gear 108 is arranged at a position of the output shaft 107 corresponding to the rack 106, the matched gear 108 is meshed with the rack 106, a cleaning belt 1010 is arranged right below a moving track of the screening cylinder 100, the cleaning belt 1010 is connected with a belt roller, one end of the belt roller is fixedly mounted between the belt roller and the rotating motor 103, and the bracket 1010 is provided with a guide plate 1011;

specifically, in order to reduce the ash content and impurity of petroleum coke, through sending the petroleum coke into screening section of thick bamboo 100, cooperation rotating electrical machines 103 drives screening section of thick bamboo 100 and rotates, thereby make the petroleum coke in the screening section of thick bamboo 100 break away from with dust and other impurity, in order to be convenient for handle dust and impurity that separates from the petroleum coke, set up horizontal guide rail frame 105 and carry out slidable mounting to screening section of thick bamboo 100, when carrying out screening preliminary treatment, move screening section of thick bamboo 100 to the side and screen, dust and impurity fall to the clearance belt 1010 that the bottom set up, set up the deflector 1011 in clearance belt 1010 upside simultaneously, avoid dust and impurity to fall to other positions, wherein screening section of thick bamboo 100's width is less than the width of conveyer belt, can further guarantee the reliable receiving and conveying processing of impurity, drive output shaft 107 through travelling motor 109 after the screening finishes and rotate, combine rack 106 and cooperation gear 108, realize pushing movable frame 104 and the screening section of thick bamboo 100 that links to each other with movable frame 104 to reach the upside of crushing mechanism, release petroleum coke to smash in crushing case 2.

As shown in fig. 7 and 8, the crushing mechanism is disposed right below one end of the horizontal guide rail frame 105, the crushing mechanism comprises a crushing box 2, crushing rollers 20 are disposed in the crushing box 2, the crushing rollers 20 are symmetrically disposed, grinding rollers 21 are disposed at the lower side of the crushing rollers 20, the grinding rollers 21 are symmetrically disposed, the bottom of the crushing box 2 is connected with the mixing mechanism, the mixing mechanism comprises a stirring barrel 3, an asphalt pipe 30 is further connected to the stirring barrel 3, the bottom of the stirring barrel 3 is connected with a granulating mechanism 4, the granulating mechanism 4 is connected with a grinding mechanism 5, the grinding mechanism 5 is connected with a graphitization processing mechanism 7 through a conveying pipe 6 and a conveying pump 60, and the graphitization processing mechanism 7 is connected with a sieving and demagnetizing mechanism;

specifically, the petroleum coke subjected to screening pretreatment is formed into irregular blocks, the petroleum coke is firstly crushed by utilizing a crushing mechanism, then the crushed and crushed petroleum coke is further ground and refined by combining with a grinding roller 21, the crushed and ground petroleum coke particles fall into a stirring barrel 3 and are stirred and mixed with liquid asphalt introduced into the stirring barrel 3 to form a mixture in a sludge state, because the asphalt is solidified and hardened in a normal temperature state, an electromagnetic heating device is arranged on the periphery of the stirring barrel 3, the reliable mixing of the asphalt and the petroleum coke in the stirring process is ensured, the mixture after the stirring is sent into a granulating mechanism 4 for granulating, the mixture is dispersed to form granular solids with the same specification, the granular solids are synchronously sent into a grinding mechanism 5 for grinding to obtain powdery particles, the powdery particles are sent into a graphitizing mechanism 7 by combining a conveying pipe 6 and a conveying pump 60 for heating graphitizing treatment, and finally the negative electrode material graphite product is obtained through cooling, screening and demagnetization.

The preparation process comprises the following steps:

s1, screening pretreatment, namely conveying petroleum coke into a screening cylinder 100, starting a rotary motor 103 connected with the screening cylinder 100 to drive the screening cylinder 100 to rotate, so that the petroleum coke in the screening cylinder 100 is subjected to rolling screening, dust and other impurity particles in the petroleum coke are separated, and the screened petroleum coke is released into a crushing mechanism;

s2, mixing materials, namely, after petroleum coke enters a crushing mechanism to be crushed, the petroleum coke falls into a stirring barrel 3 in the mixing mechanism, and asphalt which is in a liquid state after being heated is led into the stirring barrel 3 by combining an asphalt pipe 30 arranged on the stirring barrel 3, so that petroleum coke crushed aggregates and asphalt are stirred and mixed in the stirring barrel 3 to form a silt-shaped mixture, and the mixture is sent into a granulating mechanism 4 after stirring is completed;

s3, granulating, namely dispersing the petroleum coke and asphalt mixture into granular solids with the same specification through a granulating mechanism 4, then conveying the granular solids into a grinding mechanism 5, crushing and grinding the granular solids to obtain powder, conveying the powder into a graphitization treatment mechanism 7 along a conveying pipe 6, and keeping the temperature in the graphitization treatment mechanism 7 between 3000 ℃ and 3400 ℃ and heating for between 24 hours and 72 hours;

and S4, sieving and demagnetizing the powder after graphitization treatment.

Further, as shown in fig. 3 to 6, the sieving cylinder 100 is further provided with a feeding and discharging assembly, the feeding and discharging assembly comprises a feeding chute 1105 arranged on the side disc 102, a feeding plate 1102 is arranged on the outer side of the feeding chute 1105, a guide groove 1106 is arranged on the side disc 102, the feeding plate 1102 is slidably installed through the guide groove 1106, the guide groove 1106 is in an arc-shaped arrangement, and the circle center of the guide groove 1106 is mutually overlapped with the rotation center of the side disc 102.

Specifically, in order to facilitate feeding of petroleum coke into the sieving cartridge 100, a feed chute 1105 is provided on the side disc 102, a feed plate 1102 slidably mounted on the feed chute 1105 is provided, the feed plate 1102 is opened to feed petroleum coke, and the feed is completed by closing the feed plate 1102.

Further, as shown in fig. 5, the feeding and discharging assembly further includes a discharge chute 1000 disposed on the screening barrel 100, an arc-shaped mounting groove 1101 is disposed on the side disc 102, a closed arc-shaped plate 110 is slidably mounted between the arc-shaped mounting grooves 1101, the inner side of the closed arc-shaped plate 110 is tangential to the connecting rod 101, a mounting column 1108 is disposed at the end of the closed arc-shaped plate 110, and the closed arc-shaped plate 110 is slidably mounted between the mounting column 1108 and the arc-shaped mounting groove 1101.

Specifically, after the screening pretreatment of the petroleum coke is completed in the screening barrel 100, in order to facilitate discharging, a discharging chute 1000 is arranged on the screening barrel 100, meanwhile, a sealing arc plate 110 is arranged between the side discs 102 to seal the discharging chute 1000, when the petroleum coke is screened, the sealing arc plate 110 blocks the discharging chute 1000, and after the screening is completed, the sealing arc plate 110 can be opened to complete discharging operation of the petroleum coke.

Further, as shown in fig. 5, the feeding and discharging assembly further comprises a driving module, a closed spring is arranged in the guide groove 1106, a tightening spring 1107 is arranged in the arc-shaped mounting groove 1101, a sleeving column 1109 is arranged on a mounting column 1108 on one side, close to the tightening spring 1107, of the closed arc-shaped plate 110, the sleeving column 1109 is matched with the tightening spring 1107, an extension column 1110 is arranged on one side, far away from the tightening spring 1107, of the closed arc-shaped plate 110, a linkage frame 1103 is sleeved on the rotating axis of the screening cylinder 100, the linkage frame 1103 is in contact installation with the extension column 1110, a driving frame 1104 is arranged on the side disc 102, the driving frame 1104 is in arc-shaped arrangement, and two ends of the driving frame 1104 are respectively in contact installation with edges of the linkage frame 1103 and the feeding plate 1102.

Specifically, in order to simplify the petroleum coke feeding and discharging operation, a tightening spring 1107 is arranged on the arc-shaped mounting groove 1101, and the closed arc-shaped plate 110 is tightly installed in a propping mode, so that the closed arc-shaped plate 110 always closes the position of the discharging groove 1000 under the action of no external force, and meanwhile, a closed spring is arranged in the guide groove 1106 arranged on the feeding plate 1102, so that the feeding plate 1102 is covered on the feeding groove 1105 when no external force is applied, and petroleum coke leakage in the screening process is avoided. When feeding, the driving frame 1104 in the driving module rotates, so that the driving frame 1104 rotates to one side of the feeding plate 1102, the feeding plate 1102 is pushed to open the feeding groove 1105 for feeding, after finishing resetting, the feeding plate 1102 is pushed by the closing spring to re-close the feeding groove 1105; during discharging, the driving frame 1104 rotates to one side of the linkage frame 1103, the linkage frame 1103 is pushed to rotate around the rotation center, the closed arc plate 110 connected with the extension column 1110 is pushed to open the storage tank part, discharging is carried out, after discharging is finished, the reset is carried out, and the closed arc plate 110 re-closes the discharge tank 1000 under the action of the pushing spring 1107.

Further, as shown in fig. 8, the pulverizing rollers 20 are uniformly provided with pulverizing cones 22, the pulverizing rollers 20 are driven by gears, and the symmetrically arranged grinding rollers 21 are respectively driven by belts with the pulverizing rollers 20 on the same side.

Specifically, the gear transmission and belt transmission are not shown in fig. 8, the grinding rollers 20 are in gear transmission, and the grinding rollers 21 and the grinding rollers 20 on the same side are in belt transmission, so that the number of power elements can be reduced, and the structure is simplified.

Further, as shown in fig. 9, the granulating mechanism 4 includes a receiving hopper 40, a blanking roller 41 is disposed in the receiving hopper 40, the blanking rollers 41 are symmetrically disposed, a granulating belt is disposed below the blanking roller 41, granulating grooves 42 are uniformly disposed on the granulating belt, a pressing roller 43 is disposed on the upper side of the granulating belt, a supporting roller 44 is correspondingly disposed on the other side of the granulating belt by the pressing roller 43, the granulating belt is in a triangular arrangement, a low-temperature box 45 is disposed on a horizontal section of the granulating belt, and a vibrator 46 is disposed on an inclined section of the granulating belt in a matched manner.

Specifically, a discharging roller 41 is arranged in the receiving hopper 40, the two discharging rollers 41 extrude and discharge the mixture, so that the mixture moves down to the granulating belt in a flat shape, then the mixture is pressed into the granulating tank 42 by the cooperation of the pressing roller 43, along with the movement of the granulating belt, the temperature of the granulating belt is quickly reduced by the arrangement of a low-temperature box 45, the mixture is quickly solidified and hardened, and the granular mixture is separated from the granulating tank 42 by the cooperation of a vibrator 46 of an inclined section, so that the granulating is completed.

Further, as shown in fig. 10, the sieving and demagnetizing mechanism includes a vibrating screen 70 disposed between the graphitizing treatment mechanism 7 and the demagnetizing drum 8, a vibrating motor 85 is disposed at the bottom of the demagnetizing drum 8, the vibrating motor 85 is connected with a vibrating rod 86, the end of the vibrating rod 86 is mounted in contact with the vibrating screen 70, a blanking disc 80 is mounted on the vibrating rod 86, an electromagnet is disposed in the blanking disc 80, an inclined guide plate 84 is disposed at the lower side of the demagnetizing drum 8, and a discharging pipe 88 is disposed at the lowest position of the guide plate 84.

Further, the blanking disc 80 is in a conical shape, a spiral groove 81 is formed in the upper surface of the blanking disc 80, two groups of blanking discs 80 are arranged, a downward concave guide hopper 82 is arranged between the two groups of blanking discs 80, a guide hole 83 is formed in the middle of the guide hopper 82, and the edge of the guide hopper 82 is fixedly connected with the demagnetizing cylinder 8.

Specifically, in order to facilitate demagnetization and screening after graphitization, through setting up vibrating motor 85, vibrating rod 86 drives vibrating screen 70 and vibrates the unloading, and graphite falls on conical unloading disc 80 simultaneously, and graphite powder is along the upper surface gliding of unloading disc 80, cooperates the electro-magnet to accomplish the demagnetization operation, sets up the gliding speed that spiral groove 81 can reduce graphite on unloading disc 80, promotes the demagnetization effect.

The working principle of the embodiment of the invention is as follows:

as shown in fig. 1 to 10, the sieving cylinder 100 is translated to the upper part of the cleaning belt 1010 through the shifting component, the feeding plate 1102 is opened by the driving module, petroleum coke is conveyed into the sieving cylinder 100 through the feeding groove 1105, the feeding plate 1102 is closed after feeding is completed, the rotating motor 103 is started to drive the sieving cylinder 100 to rotate, the petroleum coke is subjected to sieving pretreatment, dust and impurities obtained through sieving are cleaned through the cleaning belt 1010, the sieving cylinder 100 is conveyed to the upper part of the crushing mechanism through the shifting component after sieving is completed, the closed arc plate 110 is opened, the petroleum coke falls into the crushing mechanism, the crushing mechanism is started to crush and grind the petroleum coke, and crushed and ground petroleum coke particles are conveyed into the stirring barrel 3 to be mixed and stirred with asphalt to form a mixture, and then the mixture is sent to a granulating mechanism 4, the two blanking rollers 41 are combined to extrude and discharge the mixture, the mixture is enabled to move down to a granulating belt in a flat shape, then the mixture is pressed into a granulating groove 42 by matching with a pressing roller 43, along with the movement of the granulating belt, the temperature of the granulating belt is rapidly reduced by setting a low-temperature box 45, the mixture is rapidly solidified and hardened, the granular mixture is separated from the granulating groove 42 by matching with a vibrator 46 of an inclined section, the granular mixture with the same specification is obtained, the granular mixture is sent to a grinding mechanism 5 to be ground to obtain powder, then the powder is sent to a graphitization processing mechanism 7 to be graphitized at a high temperature, and then the graphite product is screened and demagnetized, so that the graphite product of the cathode material is obtained.

The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the invention. Any reference sign in a claim should not be construed as limiting the claim concerned.

Furthermore, it should be understood that although the present disclosure describes embodiments, not every embodiment is provided with a separate embodiment, and that this description is provided for clarity only, and that the disclosure is not limited to the embodiments described in detail below, and that the embodiments described in the examples may be combined as appropriate to form other embodiments that will be apparent to those skilled in the art.

Claims (3)

1. The preparation process of the negative electrode material is characterized in that a preparation device adopted in the preparation process comprises a pretreatment mechanism (1), a crushing mechanism, a mixing mechanism, a granulating mechanism (4), a grinding mechanism (5), a graphitization treatment mechanism (7) and a sieving and demagnetizing mechanism;

the pretreatment mechanism (1) comprises a screening cylinder (100), a connecting rod (101) is uniformly arranged on the outer side of the screening cylinder (100), side discs (102) are arranged at two ends of the screening cylinder (100), one side of the side discs (102) is connected with a rotating motor (103), the pretreatment mechanism further comprises a shifting assembly, the shifting assembly comprises a horizontal guide rail frame (105), the horizontal guide rail frame (105) is connected with a bracket (1012), the horizontal guide rail frame (105) is arranged at two ends of the screening cylinder (100), the screening cylinder (100) and the horizontal guide rail frame (105) are slidably mounted, a moving frame (104) is slidably mounted on the horizontal guide rail frame (105), one end of the moving frame (104) is fixedly mounted with the rotating motor (103), a walking motor (109) is arranged on the horizontal guide rail frame (105), the walking motor (109) is connected with an output shaft (107), the position of the output shaft (107) corresponding to a rack (106) is provided with a matched gear (108), the matched gear (108) is meshed with the rack (106), the belt (1010) is meshed with a belt cleaning roller (1010), a guide plate (1011) is arranged above the cleaning belt (1010) and is rotatably arranged between the belt roller and the bracket (1012);

the utility model provides a grinding machine, including horizontal guide rail frame (105) and grinding machine, grinding machine sets up under horizontal guide rail frame (105) one end, grinding machine includes grinding case (2), be provided with grinding roller (20) in grinding case (2), grinding roller (20) symmetry sets up, the downside of grinding roller (20) is provided with grinding roller (21), grinding roller (21) symmetry sets up, the bottom and the compounding mechanism of grinding case (2) are connected, compounding mechanism includes agitator (3), still be connected with pitch pipe (30) on agitator (3), the bottom and the granulation mechanism (4) of agitator (3) link to each other, granulation mechanism (4) are connected with grinding machine (5), grinding machine (5) link to each other with graphitization processing mechanism (7) through conveyer pipe (6) and delivery pump (60), graphitization processing mechanism (7) link to each other with screening demagnetization mechanism.

The screening cylinder (100) is further provided with a feeding and discharging assembly, the feeding and discharging assembly comprises a feeding groove (1105) arranged on the side disc (102), a feeding plate (1102) is arranged on the outer side of the feeding groove (1105), a guide groove (1106) is arranged on the side disc (102), the feeding plate (1102) is slidably arranged through the guide groove (1106), the guide groove (1106) is arranged in an arc shape, and the circle center of the guide groove (1106) is mutually overlapped with the rotation center of the side disc (102);

the feeding and discharging assembly further comprises a discharging groove (1000) arranged on the screening barrel (100), arc-shaped mounting grooves (1101) are formed in the side disc (102), a closed arc-shaped plate (110) is slidably arranged between the arc-shaped mounting grooves (1101), the inner side of the closed arc-shaped plate (110) is tangential to the connecting rod (101), mounting columns (1108) are arranged at the end parts of the closed arc-shaped plate (110), and the closed arc-shaped plate (110) is slidably arranged between the mounting columns (1108) and the arc-shaped mounting grooves (1101);

the feeding and discharging assembly further comprises a driving module, a closed spring is arranged in the guide groove (1106), a jacking spring (1107) is arranged in the arc-shaped mounting groove (1101), an extension column (1110) is arranged on one side, far away from the jacking spring (1107), of the closed arc-shaped plate (110), a linkage frame (1103) is sleeved on the rotary axis of the screening cylinder (100), the linkage frame (1103) is in contact installation with the extension column (1110), a driving frame (1104) is arranged on the side disc (102), the driving frame (1104) is in arc-shaped arrangement, and two ends of the driving frame (1104) are respectively in contact installation with the edges of the linkage frame (1103) and the feeding plate (1102);

the sieving and demagnetizing mechanism comprises a vibrating screen (70) arranged between a graphitizing treatment mechanism (7) and a demagnetizing cylinder (8), a vibrating motor (85) is arranged at the bottom of the demagnetizing cylinder (8), the vibrating motor (85) is connected with a vibrating rod (86), the tail end of the vibrating rod (86) is in contact with the vibrating screen (70), a blanking disc (80) is arranged on the vibrating rod (86), an electromagnet is arranged in the blanking disc (80), an inclined stock guide plate (84) is arranged at the lower side of the demagnetizing cylinder (8), and a discharging pipe (88) is arranged at the lowest position of the stock guide plate (84);

the blanking disc (80) is arranged in a conical shape, spiral grooves (81) are formed in the upper surface of the blanking disc (80), two groups of blanking discs (80) are arranged, a downward concave guide hopper (82) is arranged between the two groups of blanking discs (80), a guide hole (83) is formed in the middle of the guide hopper (82), and the edge of the guide hopper (82) is fixedly connected with the demagnetizing cylinder (8);

the preparation process comprises the following steps:

s1, screening pretreatment, namely conveying petroleum coke into a screening cylinder (100), starting a rotary motor (103) connected with the screening cylinder (100) to drive the screening cylinder (100) to rotate, so that the petroleum coke in the screening cylinder (100) is subjected to rolling screening, dust and other impurity particles in the petroleum coke are separated, and the screened petroleum coke is released into a crushing mechanism;

s2, mixing materials, namely, after petroleum coke enters a crushing mechanism to be crushed, the petroleum coke falls into a stirring barrel (3) in the mixing mechanism, and asphalt which is in a liquid state after heating is led into the stirring barrel (3) by combining an asphalt pipe (30) arranged on the stirring barrel (3), so that the petroleum coke crushed materials and the asphalt are stirred and mixed in the stirring barrel (3) to form a sludge-like mixture, and the mixture is sent into a granulating mechanism (4) after stirring is completed;

s3, granulating, namely dispersing the petroleum coke and asphalt mixture into granular solids with the same specification through a granulating mechanism (4), then conveying the granular solids into a grinding mechanism (5) to grind the granular solids into powder, conveying the powder into a graphitization treatment mechanism (7) along a conveying pipe (6), and keeping the temperature in the graphitization treatment mechanism (7) between 3000 ℃ and 3400 ℃ and heating for between 24 hours and 72 hours;

s4, after graphitization treatment, feeding the powder into a sieving and demagnetizing mechanism, and sieving and demagnetizing the powder.

2. The process for preparing the negative electrode material according to claim 1, wherein crushing cones (22) are uniformly arranged on the crushing rollers (20), the crushing rollers (20) are driven by gears, and symmetrically arranged grinding rollers (21) are respectively driven by belts with the crushing rollers (20) on the same side.

3. The process for preparing the negative electrode material according to claim 1, wherein the granulating mechanism (4) comprises a receiving hopper (40), a blanking roller (41) is arranged in the receiving hopper (40), the blanking rollers (41) are symmetrically arranged, a granulating belt is arranged below the blanking rollers (41), granulating grooves (42) are uniformly formed in the granulating belt, a pressing roller (43) is arranged on the upper side of the granulating belt, a supporting roller (44) is correspondingly arranged on the other side of the granulating belt, the granulating belt is arranged in a triangular shape, a low-temperature box (45) is arranged on the horizontal section of the granulating belt, and a vibrator (46) is arranged on the inclined section of the granulating belt in a matched mode.

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