Fine crushing device and process for lithium manganese iron phosphate material

Abstract

The invention relates to the technical field of lithium battery raw material processing, in particular to a fine crushing device and process for a lithium manganese iron phosphate material. The fine crushing device comprises an airflow crushing machine body, and a grading assembly is arranged at the top end in the airflow crushing machine body; the sanding machine body is positioned on one side of the airflow crushing machine body; the fluidized bed drying and coating machine body is positioned on one side of the sanding machine body; the opening and closing assembly comprises an annular pipe arranged on the outer side of the jet mill body in a sleeving mode and adjusting bases evenly arranged above the annular pipe at intervals in the circumferential direction of the outer wall of the jet mill body. The adjusting assembly comprises an annular plate arranged on the outer side of the airflow smashing machine body in a sleeving mode and sliding blocks fixedly arranged at the front end and the rear end of the inner wall of the annular plate. The fine crushing device for the lithium manganese iron phosphate material can be used for inspecting a high-pressure airflow pipe, reducing the pressure of an air source, reducing the temperature of a grinding space, avoiding manganese oxidation, synchronously completing drying and coating of lithium manganese iron phosphate, and avoiding secondary agglomeration.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of lithium battery raw material processing, and particularly relates to a fine crushing device and process for lithium manganese iron phosphate material. BACKGROUND

[0002] Lithium manganese iron phosphate is a positive material of lithium battery, and is essentially an upgraded version or derivative material developed on the basis of mature lithium iron phosphate positive material. The core idea is to replace a part of manganese atoms with iron atoms in the lithium iron phosphate crystal lattice. Lithium manganese iron phosphate mainly aims at application scenarios sensitive to safety and cost, and needs to improve energy density, and is an important upgrade path of LFP, with core advantages of high energy density, high safety, long service life and low cost potential. However, lithium manganese iron phosphate material needs to be finely crushed during production as a lithium battery raw material. The core goal is to achieve material nanocrystallization while avoiding the introduction of impurities, preventing lattice structure damage and controlling energy consumption. For example, the existing public document CN217042907U - a fine crushing device for lithium manganese iron phosphate material; the existing public document CN220835997U - a high-fineness crushing assembly for lithium manganese iron phosphate production; and the existing public document CN220048359U - a lithium manganese iron phosphate positive material crushing device, disclose a lithium manganese iron phosphate crushing device. Although the existing public fine crushing device for lithium manganese iron phosphate material can achieve fine crushing of lithium manganese iron phosphate material, there are still some deficiencies in actual use. First, the existing air jet mill is provided with multiple groups of high-pressure airflow pipes for jetting lithium manganese iron phosphate material for collision grinding. However, the high-pressure airflow pipes lack closing measures. If residual materials adhere to the inner wall of the high-pressure airflow pipes, the material jetting speed, subsequent grinding effect and efficiency will be affected, which is not conducive to the inspection and maintenance of the same group (two symmetrical) high-pressure airflow pipes, and the gas source pressure needs to be increased, resulting in high energy consumption. Second, the existing fine crushing device for lithium manganese iron phosphate material is prone to local high temperature during the crushing and grinding process of lithium manganese iron phosphate material due to frequent friction, which causes manganese oxidation and aggravates material cycle degradation. Finally, the existing fine crushing device for lithium manganese iron phosphate material performs coating operation after material crushing. However, this method is prone to irreversible adhesion of nanometer particles during subsequent drying, resulting in a decrease in compactness. SUMMARY

[0003] This section is intended to summarize some aspects of the embodiments of the present application and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section and the abstract and title of the specification to avoid obscuring the purpose of this section, abstract and title, and such simplifications or omissions cannot be used to limit the scope of the present application.

[0004] In view of the above-mentioned existing jet mill sets multiple groups of high-pressure air flow pipe to jet manganese iron lithium phosphate material to collide and grind, and the high-pressure air flow pipe lacks closing measures, if residual material is attached to the inner wall of the high-pressure air flow pipe, the material jetting speed will be affected, and the subsequent grinding effect and efficiency will be affected, which is not conducive to the inspection and maintenance of the same group (two symmetrical) high-pressure air flow pipes, and the gas source pressure needs to be increased, which is high in energy consumption, and a fine crushing device for manganese iron lithium phosphate material is provided.

[0005] To solve the above technical problems, the present application provides the following technical scheme: a fine crushing device for manganese iron lithium phosphate material, comprising a jet mill body, a grading assembly is arranged at the top of the inside of the jet mill body, and a first feeding pipe is arranged at the top of the outer wall of the jet mill body; a sand mill body is arranged on one side of the jet mill body, a sand mill cylinder is installed at the top of the sand mill body, and a feeding pipe is arranged at one end of the top of the sand mill cylinder; a fluidized bed drying coating machine body is arranged on one side of the sand mill body, a top cover is installed at the top of the fluidized bed drying coating machine body, and a feeding hopper is arranged at one end of the upper surface of the top cover; an opening and closing assembly comprises a ring pipe arranged outside the jet mill body and an adjusting seat arranged above the ring pipe in a uniform and spaced manner along the circumferential direction of the outer wall of the jet mill body, first toothed discs are symmetrically arranged at the front and rear ends above the ring pipe, second toothed discs and third toothed discs are symmetrically arranged at the front and rear ends of the two sides of the ring pipe, respectively; and an adjusting assembly comprises a ring plate arranged outside the jet mill body and a sliding block fixedly arranged at the front and rear ends of the inner wall of the ring plate, the sliding block is slidingly installed in the inside of a sliding frame, a support plate is fixedly arranged at one end of the bottom of the ring plate, a motor is installed above the support plate, a fourth toothed disc is installed on the output shaft of the motor, and a toothed ring is rotatably installed on the outer wall of the ring plate; wherein an iron block is embedded in the inside center position of the sliding block, electromagnetic blocks are embedded in the inside top end and bottom end center positions of the sliding frame, the electromagnetic blocks are magnetically attracted to the iron block, the sliding frame is installed on the outer wall of the jet mill body, and the splines on the outer wall of the fourth toothed disc are engaged with the splines on the outer wall of the toothed ring.

[0006] As a preferred scheme of the fine crushing device for manganese iron lithium phosphate material, one side wall of the sand mill cylinder is provided with an end cover, a second feeding pipe is arranged at the center position of the outer wall of the end cover, a sand grinding assembly is arranged in the inside of the sand mill cylinder, a hot gas pipe is arranged on the front end face of the fluidized bed drying coating machine body, an exhaust pipe is arranged at the other end of the upper surface of the top cover, and a discharge pipe is arranged at one end of the bottom of the fluidized bed drying coating machine body.

[0007] As a preferred scheme of the fine crushing device of the lithium iron manganese phosphate material, the bottom center positions of the first tooth disc, the second tooth disc and the third tooth disc are fixedly provided with rotating shafts, the bottom ends of the rotating shafts are connected with ball valves through the top bearings of the adjusting seats, the ball valves are rotatably installed in the adjusting seats, the center positions of the side walls of the adjusting seats are provided with high-pressure airflow pipes, and the center positions of the other side walls of the adjusting seats are provided with branch pipes, and the other ends of the branch pipes are arranged on the outer walls of the ring pipes.

[0008] The application has the advantages that: through the opening and closing assembly and the adjusting assembly, each group (two) of high-pressure airflow pipes can be opened and closed independently, and the high-pressure airflow pipes can be subjected to air pressure inspection, so that the jetting pressures of each high-pressure airflow pipe are ensured to be the same, the jetting pressures of the corresponding two high-pressure airflow pipes (one group) are prevented from being different, the material grinding efficiency and effect are affected, and in the subsequent maintenance process, the jetting pressure problems of the high-pressure airflow pipes can be quickly detected and judged, and the total pressure of the air source in the inspection process can be reduced, and the energy consumption is reduced.

[0009] In view of the fact that the existing fine crushing device of the lithium iron manganese phosphate material is prone to local high temperature due to frequent friction during the crushing and grinding of the lithium iron manganese phosphate material, manganese oxidation is caused, and the material circulation is aggravated, a further improvement of the fine crushing device of the lithium iron manganese phosphate material is provided.

[0010] As a preferred scheme of the fine crushing device of the lithium iron manganese phosphate material, the stainless steel spiral pipe is further arranged on the inner wall of the sand mill barrel.

[0011] As a preferred scheme of the fine crushing device of the lithium iron manganese phosphate material, the cooling assembly is further arranged behind the sand mill body, the cooling assembly comprises a liquid nitrogen tank installed behind the sand mill body and a heat exchange tank installed above the liquid nitrogen tank, the liquid outlet end of the liquid nitrogen tank is connected with the first connecting pipe through a pipe joint, and the other end of the first connecting pipe is connected with the liquid inlet end of the pump through a pipe joint.

[0012] As a preferred scheme of the fine crushing device of the lithium iron manganese phosphate material, the liquid outlet end of the pump is connected with the second connecting pipe and the third connecting pipe through a three-way joint, the other end of the second connecting pipe is connected with the liquid inlet end of the first jacket through a pipe joint, the liquid outlet end of the first jacket is connected with the fourth connecting pipe through a pipe joint, and the other end of the third connecting pipe is connected with the liquid inlet end of the second jacket through a pipe joint.

[0013] As a preferred scheme of the fine crushing device of the lithium iron manganese phosphate material, the liquid outlet on the second jacket is connected with the fifth connecting pipe through a pipe joint, the fourth connecting pipe and the other end of the fifth connecting pipe are both connected with the heat exchange pipe through pipe joints, the heat exchange pipe is arranged in the inside of the heat exchange box, and the other end of the heat exchange pipe penetrates through the bottom of the heat exchange box and is connected with the liquid inlet on the top of the liquid nitrogen tank through a pipe joint.

[0014] As a preferred scheme of the fine crushing device of the lithium iron manganese phosphate material, the gas outlet on the side wall of the heat exchange box is connected with the sixth connecting pipe through a pipe joint, the other end of the sixth connecting pipe is connected with the air inlet of the fan through a pipe joint, the air outlet of the fan is connected with the seventh connecting pipe through a pipe joint, and the other end of the seventh connecting pipe is connected with the air inlet on the rear end face of the fluidized bed drying coating machine body through a pipe joint.

[0015] Another beneficial effect of the present application is that by setting the stainless steel spiral pipe and the cooling assembly, the liquid nitrogen jacket is arranged on the periphery of the jet mill body, the double-circulation water cooling is arranged on the inner and outer sides of the sand mill barrel, the inner layer is the stainless steel spiral pipe, the low-temperature ethylene glycol solution is introduced into the inside of the stainless steel spiral pipe, and the outer layer is the liquid nitrogen jacket, so that the inside of the jet mill body and the sand mill barrel can be in a low-temperature environment, local high temperature is prevented from causing manganese oxidation, the waste heat in the cooling system can be used for preheating of the air inlet in the fluidized bed, energy consumption is saved, and the cost is reduced.

[0016] In view of the fact that the existing fine crushing device of the lithium iron manganese phosphate material performs coating operation after material crushing, and the nano particles are prone to irreversible adhesion to each other in the subsequent drying process, resulting in a problem of a decrease in the compaction density, a further improvement of the fine crushing device of the lithium iron manganese phosphate material is provided.

[0017] As a preferred scheme of the fine crushing device of the lithium iron manganese phosphate material, the misting assembly is further arranged above the top cover, the misting assembly comprises a flow dividing pipe arranged at the top end of the top cover, the bottom of the flow dividing pipe is provided with jet pipes arranged in the horizontal direction, and the bottom of the jet pipes is provided with nozzles arranged from front to back.

[0018] Another beneficial effect of the present application is that by setting the misting assembly, the carbon source is atomized into droplets, the nano particles after grinding are combined with the atomized carbon source droplets in a fluidized state, and the drying and coating of the lithium iron manganese phosphate are simultaneously completed, thereby avoiding secondary agglomeration.

[0019] In addition, the present application further provides the following technical scheme: a crushing method of the fine crushing device of the lithium iron manganese phosphate material, and the fine crushing device of the lithium iron manganese phosphate material performs fine crushing operation on the lithium iron manganese phosphate material according to the following steps. S1: Before grinding the lithium manganese iron phosphate material, adjust the height of the gear ring under the magnetic adjustment of the electromagnetic block and the iron block, and then use the motor to drive the ball valves in the corresponding adjustment seats to open or close them in pairs, and then inspect the high-pressure air flow pipes set in pairs; S2: After the high-pressure airflow pipe inspection is completed, the lithium iron manganese phosphate material is sprayed into the airflow mill body to achieve preliminary grinding of the lithium iron manganese phosphate material. The lithium iron manganese phosphate material after preliminary grinding is screened by the grading component and then passed into the sand mill cylinder for secondary grinding by the sand mill component; S3: During the grinding process of the lithium manganese iron phosphate material, the pump is running to introduce liquid nitrogen into the first and second jackets on the outside of the air flow mill body and the sand mill cylinder, respectively, so that the air flow mill body and the inside of the sand mill cylinder are in a low temperature environment to prevent local high temperature from causing manganese oxidation, and the residual heat in the cooling system is introduced into the fluidized bed drying and coating body for preheating; S4: After preheating, the twice-ground lithium manganese iron phosphate material is input into the fluidized bed drying and coating body. At the same time, hot nitrogen is introduced into the fluidized bed drying and coating body. Then, an ultrasonic atomizer is used to atomize the carbon source into droplets. The nanoparticles are combined with the atomized carbon source droplets in a fluidized state to simultaneously complete the drying and coating of the lithium manganese iron phosphate. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. Those skilled in the art can also derive other drawings based on these drawings without inventive effort. Among them: Figure 1 This is a schematic diagram of the overall structure of the fine grinding device for lithium manganese iron phosphate material in the present invention.

[0021] Figure 2 For the present invention Figure 1 Schematic diagram of the structure of the air flow crushing machine body.

[0022] Figure 3 For the present invention Figure 2 Vertical cross-sectional view of the air jet mill body in the structure.

[0023] Figure 4 For the present invention Figure 1 Schematic diagram of the structure of the sand mill body.

[0024] Figure 5 For the present invention Figure 4 Vertical cross-section of the sanding cylinder in the structure.

[0025] Figure 6 For the present invention Figure 1Structure diagram of the fluidized bed drying coating machine in the structure.

[0026] Figure 7 For the invention Figure 2 Structure diagram of the opening and closing assembly and the adjusting assembly in the structure.

[0027] Figure 8 For the invention Figure 7 Vertical sectional view of the adjusting seat in the structure.

[0028] Figure 9 For the invention Figure 7 Structure diagram of the adjusting assembly in the structure.

[0029] Figure 10 For the invention Figure 1 Structure diagram of the cooling assembly in the structure Figure 1 .

[0030] Figure 11 For the invention Figure 1 Structure diagram of the cooling assembly in the structure Figure 2 .

[0031] Figure 12 For the invention Figure 11 Vertical sectional view of the liquid nitrogen tank and the heat exchange tank in the structure.

[0032] Figure 13 For the invention Figure 6 Structure diagram of the atomizing assembly in the structure.

[0033] In the drawings, the components represented by each reference numeral are listed as follows: 100, jet mill body; 101, classification assembly; 102, first feed pipe; 200, sand mill body; 201, sand mill barrel; 201a, feed pipe; 202, end cover; 202a, second feed pipe; 203, sand mill assembly; 300, fluidized bed drying coating machine body; 301, top cover; 301a, feed hopper; 301b, hot gas pipe; 301c, exhaust pipe; 302, discharge pipe; 400, opening and closing assembly; 401, ring pipe; 402, first tooth disc; 402a, rotating shaft; 403, second tooth disc; 404, third tooth disc; 405, adjusting seat; 405a, ball valve; 405b, high-pressure airflow pipe; 405c, branch pipe; 500, adjusting assembly; 501, ring plate; 501a, branch plate; 502, sliding block; 502a, iron block; 503, sliding frame; 503a, electromagnetic block; 504, motor; 504a, fourth tooth disc; 505, tooth ring; 600, stainless steel spiral pipe; 700, cooling assembly; 701, liquid nitrogen tank; 701a, first connecting pipe; 702, heat exchange tank; 702a, heat exchange pipe; 703, pump; 703a, second connecting pipe; 703b, third connecting pipe; 704, first jacket; 704a, fourth connecting pipe; 705, second jacket; 705a, fifth connecting pipe; 706, fan; 706a, sixth connecting pipe; 706b, seventh connecting pipe; 800, atomization assembly; 801, flow dividing pipe; 802, spray pipe; 802a, spray head. DETAILED DESCRIPTION

[0034] In order to make the above objectives, features and advantages of the present application more obvious and easy to understand, the specific embodiments of the present application will be described in detail below with reference to the accompanying drawings.

[0035] In the following description, a lot of specific details are set forth in order to provide a thorough understanding of the present application, but the present application can also be implemented in other ways different from those described herein, and those skilled in the art can make similar generalizations without departing from the concept of the present application, so the present application is not limited to the specific embodiments disclosed below.

[0036] Secondly, "one embodiment" or "an embodiment" referred to herein means that a specific feature, structure or characteristic can be included in at least one implementation of the present application. "In one embodiment" appearing in different places in the specification does not mean the same embodiment, nor is it an embodiment that is separate or alternative to other embodiments.

[0037] Thirdly, the present application is described in detail in conjunction with the schematic drawings, and in the detailed description of the embodiments of the present application, the cross-sectional view of the device structure is partially enlarged without the general proportion for the convenience of description, and the schematic drawings are only examples, which should not limit the scope of protection of the present application herein. In addition, three-dimensional spatial dimensions including length, width and depth should be included in actual manufacture. Embodiment

[0038] Reference Figure 1 、 Figure 2 、 Figure 3 、 Figure 7 and Figure 9 , the first embodiment of the present application provides a fine crushing device for lithium manganese iron phosphate material, which can perform air pressure inspection on two high-pressure airflow pipes 405b, ensure material injection speed and grinding effect, and reduce air source pressure and energy consumption.

[0039] Specifically, the airflow pulverizer body 100 is provided with a grading assembly 101 at the top of the inside, and a first feeding pipe 102 is arranged on the top of the outer wall of the airflow pulverizer body 100; the sand mill body 200 is located on one side of the airflow pulverizer body 100, and a sand mill cylinder 201 is installed on the top of the sand mill body 200, and a feeding pipe 201a is arranged at one end of the top of the sand mill cylinder 201; the fluidized bed drying coating machine body 300 is located on one side of the sand mill body 200, and a top cover 301 is installed on the top of the fluidized bed drying coating machine body 300, and a feeding hopper 301a is arranged at one end of the upper surface of the top cover 301; the opening and closing assembly 400 includes a ring pipe 401 sleeved outside the airflow pulverizer body 100 and an adjusting seat 405 uniformly and intervally arranged above the ring pipe 401 along the circumferential direction of the outer wall of the airflow pulverizer body 100, the first tooth disc 402 is symmetrically arranged at the front and rear ends above the ring pipe 401, the second tooth disc 403 and the third tooth disc 404 are symmetrically arranged at the front and rear ends of the two sides above the ring pipe 401 respectively; and the adjusting assembly 500 includes a ring plate 501 sleeved outside the airflow pulverizer body 100 and a sliding block 502 fixedly arranged on the inner wall of the ring plate 501, the sliding block 502 is slidingly installed in the inside of the sliding frame 503, and the bottom of the ring plate 501 is fixedly provided with a support plate 501a at one end.

[0040] Detailed reference Figure 7 、 Figure 8 and Figure 9The bottom center positions of the first gear disc 402, the second gear disc 403 and the third gear disc 404 are fixedly provided with rotating shafts 402a, the bottom ends of the rotating shafts 402a penetrate the top bearing of the adjusting seat 405 and are connected with ball valves 405a, the ball valves 405a are rotatably installed in the adjusting seat 405, a high-pressure airflow pipe 405b is arranged at the center position of one side wall of the adjusting seat 405, a branch pipe 405c is arranged at the center position of the other side wall of the adjusting seat 405, and the other end of the branch pipe 405c is arranged on the outer wall of the ring pipe 401; a motor 504 is installed above the supporting plate 501a, a fourth gear disc 504a is installed on the output shaft of the motor 504, and a gear ring 505 is rotatably installed on the outer wall of the ring plate 501; wherein the inner center position of the sliding block 502 is embedded with an iron block 502a, the inner top end and the inner bottom center position of the sliding frame 503 are embedded with electromagnetic blocks 503a, the electromagnetic blocks 503a and the iron block 502a are magnetically attracted, the sliding frame 503 is installed on the outer wall of the airflow pulverizer body 100, and the gear rack on the outer wall of the fourth gear disc 504a is engaged with the gear rack on the outer wall of the gear ring 505; In use, the above-mentioned setting is used to introduce lithium manganese iron phosphate material into the annular pipe 401, and then under the action of the high-pressure gas source, the lithium manganese iron phosphate material is introduced into the airflow pulverizer body 100 from the high-pressure airflow pipe 405b, wherein the high-pressure airflow pipe 405b is provided with six, and two are correspondingly arranged in a group, and the high-speed lithium manganese iron phosphate material sprayed from the corresponding two high-pressure airflow pipes 405b collides to achieve impact grinding of the lithium manganese iron phosphate material. The ground lithium manganese iron phosphate material is sieved by the grading assembly 101 and discharged from the first feeding pipe 102. When checking the pressure of the high-pressure airflow pipe 405b, the electromagnetic block 503a in the top of the sliding frame 503 is electrified, and the electromagnetic block 503a generates a magnetic force with the iron block 502a after being electrified, so that the sliding block 502 moves upward along the inside of the sliding frame 503, and the corresponding tooth ring 505, motor 504, fourth tooth disc 504a, etc. on the ring plate 501 move upward. At this time, the tooth ring 505 will move to the outside of the first tooth disc 402 on the uppermost layer, start the motor 504, and the output shaft of the motor 504 rotates to drive the fourth tooth disc 504a to rotate. The fourth tooth disc 504a is engaged with the tooth ring 505, and the tooth ring 505 is engaged with the first tooth disc 402, so that the rotation of the fourth tooth disc 504a will drive the first tooth disc 402 to rotate synchronously, and the rotation of the first tooth disc 402 will drive the ball valve 405a to rotate in the adjusting seat 405 under the action of the shaft 402a, thereby closing the corresponding two adjusting seats 405 below the first tooth disc 402. Similarly, repeating the above operation can further close the corresponding two adjusting seats 405 below the second tooth disc 403. At this time, only the corresponding two adjusting seats 405 below the third tooth disc 404 remain, which can realize the opening and closing of each group (two) of high-pressure airflow pipes 405b and the pressure test of the two high-pressure airflow pipes 405b, ensure that the jetting pressure of each high-pressure airflow pipe 405b is the same, avoid the influence of different jetting pressures of the corresponding two high-pressure airflow pipes 405b (one group) on the material grinding efficiency and effect, and quickly detect and judge which high-pressure airflow pipe 405b has a problem in the subsequent maintenance process. It can also reduce the total pressure of the gas source in the inspection process and reduce energy consumption.

[0041] Further, the airflow pulverizer body 100 and the grading assembly 101 are prior art, so they will not be described here. The adjusting seat 405 is provided with six, and the six high-pressure airflow pipes 405b are correspondingly arranged. The first tooth disc 402, the second tooth disc 403 and the third tooth disc 404 are correspondingly arranged in pairs, and the lengths of the corresponding shafts 402a decrease in turn. The high-pressure airflow pipe 405b can spray lithium manganese iron phosphate material into the airflow pulverizer body 100. After adjusting the height of the tooth ring 505, it can be engaged with the first tooth disc 402, the second tooth disc 403 and the third tooth disc 403 of corresponding height to realize the transmission effect. The electromagnetic block 503a is provided with two and cooperates with the iron block 502a to adjust the height of the tooth ring 505.

[0042] Detailed Figure 4 、 Figure 5 and Figure 6 As shown in the drawings, the side wall of the sanding barrel 201 is provided with an end cover 202, the outer wall of the end cover 202 is provided with a second material conveying pipe 202a at the center position, the inside of the sanding barrel 201 is provided with a sanding assembly 203, the front end face of the fluidized bed drying coating machine body 300 is provided with a hot gas pipe 301b, the other end of the upper surface of the top cover 301 is provided with an exhaust pipe 301c, and one end of the bottom of the fluidized bed drying coating machine body 300 is provided with a discharge pipe 302.

[0043] Further, the sanding assembly 203 and the fluidized bed drying coating machine body 300 are prior art, so they will not be described here. The hot gas pipe 301b can be used to introduce hot nitrogen into the inside of the fluidized bed drying coating machine body 300, so that the inside of the fluidized bed drying coating machine body 300 is filled with inert gas, thereby avoiding oxidation of the lithium manganese iron phosphate material. Embodiment

[0044] Referring to Figure 1 、 Figure 10 、 Figure 11 and Figure 12 , this is the second embodiment of the application, which is based on the previous embodiment, but differs in that, in order to avoid the high temperature inside the jet mill body 100 and the sanding barrel 201 causing manganese oxidation, liquid nitrogen jackets are arranged outside the jet mill body 100, outside and inside the sanding barrel 201, and low-temperature glycol solution is introduced into the stainless steel spiral pipe 600, so as to achieve cooling, at the same time, the waste heat is introduced into the fluidized bed drying coating machine body 300, thereby saving energy consumption and reducing cost.

[0045] Specifically, it further comprises a stainless steel spiral pipe 600 attached to the inner wall of the sanding cylinder 201, both ends of the stainless steel spiral pipe 600 penetrating the inner wall of the sanding cylinder 201 and the inner wall of the end cover 202; it further comprises a cooling assembly 700 arranged at the rear of the sanding machine body 200, the cooling assembly 700 comprising a liquid nitrogen tank 701 mounted at the rear of the sanding machine body 200 and a heat exchange tank 702 mounted above the liquid nitrogen tank 701, the liquid outlet end of the liquid nitrogen tank 701 being connected with a first connecting pipe 701a through a pipe joint, the other end of the first connecting pipe 701a being connected with the liquid inlet end of a pump 703 through a pipe joint; the liquid outlet end of the pump 703 is connected with a second connecting pipe 703a and a third connecting pipe 703b through a three-way joint, the other end of the second connecting pipe 703a being connected with the liquid inlet end on a first jacket 704 through a pipe joint, the liquid outlet end on the first jacket 704 being connected with a fourth connecting pipe 704a through a pipe joint, the other end of the third connecting pipe 703b being connected with the liquid inlet end on a second jacket 705 through a pipe joint; the liquid outlet end on the second jacket 705 is connected with a fifth connecting pipe 705a through a pipe joint, the other ends of the fourth connecting pipe 704a and the fifth connecting pipe 705a being connected with a heat exchange pipe 702a through a pipe joint, the heat exchange pipe 702a being arranged inside the heat exchange tank 702, the other end of the heat exchange pipe 702a penetrating the bottom of the heat exchange tank 702 and being connected with the liquid inlet end on the top of the liquid nitrogen tank 701 through a pipe joint; the gas outlet end on one side wall of the heat exchange tank 702 is connected with a sixth connecting pipe 706a through a pipe joint, the other end of the sixth connecting pipe 706a being connected with the air inlet end of a fan 706 through a pipe joint, the gas outlet end of the fan 706 being connected with a seventh connecting pipe 706b through a pipe joint, the other end of the seventh connecting pipe 706b being connected with the air inlet end on the rear end face of the fluidized bed drying coating machine body 300 through a pipe joint; In use, the classified lithium manganese iron phosphate material enters the sand mill cylinder 201 through the first feeding pipe 102, and then is further ground by the sand mill assembly 203. During the grinding process in the airflow mill body 100 and the sand mill cylinder 201, local high temperature is generated. At this time, the pump 703 is started to extract liquid nitrogen in the liquid nitrogen tank 701. The extracted liquid nitrogen enters the first jacket 704 and the second jacket 705 through the first connecting pipe 701a, the second connecting pipe 703a and the third connecting pipe 703b, respectively. The first jacket 704 and the second jacket 705 are arranged on the outer walls of the airflow mill body 100 and the sand mill cylinder 201, respectively. At the same time, low-temperature glycol solution is introduced into the stainless steel spiral pipe 600. Therefore, the interiors of the airflow mill body 100 and the sand mill cylinder 201 are in a low-temperature environment, preventing manganese oxidation caused by local high temperature. The waste heat in the cooling system enters the heat exchange pipe 702a to exchange heat, so that the air temperature in the heat exchange tank 702 increases. Then, the fan 706 is started to extract hot air in the heat exchange tank 702, which then enters the interior of the fluidized bed drying and coating machine body 300 through the sixth connecting pipe 706a and the seventh connecting pipe 706b, thereby preheating the air entering the fluidized bed, saving energy consumption and reducing costs.

[0046] Further, the low-temperature glycol solution is circulated in the stainless steel spiral pipe 600, and nitrogen gas is stored in the heat exchange tank 702. The heat exchange pipe 702a can make the nitrogen gas absorb the waste heat and enter the fluidized bed drying and coating machine body 300 to achieve preheating. The three-way joint and the pipe joint realize the connection of the pipeline. The liquid nitrogen is introduced into the first jacket 704 and the second jacket 705 under the action of the pump to achieve heat absorption and cooling. Embodiment

[0047] Reference Figure 1 and Figure 13 The third embodiment of the present application is based on the first embodiment. To avoid secondary agglomeration, atomized liquid droplet carbon source is introduced during the drying process of the lithium manganese iron phosphate material, and the drying and coating of the lithium manganese iron phosphate material are simultaneously completed.

[0048] Specifically, the atomization assembly 800 is arranged above the top cover 301. The atomization assembly 800 includes a flow divider 801 arranged at the top end of the top cover 301. The flow divider 801 is provided with spray pipes 802 arranged in an array in the horizontal direction at the bottom. The spray pipes 802 are provided with spray heads 802a installed in an array from front to back at the bottom. The above setting in use, after the grinding of the lithium manganese iron phosphate material after the second grinding through the second feeding pipe 202a into the fluidized bed drying coating machine body 300, at this time, first through the hot gas pipe 301b into the hot nitrogen to the fluidized bed drying coating machine body 300 inside, the lithium manganese iron phosphate material drying treatment, then under the action of ultrasonic atomizer carbon source atomized into droplets, and then by the shunt pipe 801 after the shunt, from the nozzle 802a on the spray pipe 802 to the fluidized bed drying coating machine body 300 inside, and the grinding of the nanoparticles in the fluidized state with the atomized carbon source droplets, dry and coated with lithium manganese iron phosphate, avoid secondary agglomeration, after the treatment of lithium manganese iron phosphate material by the discharge pipe 302 discharge.

[0049] Further, the shunt pipe 801 is connected with the external ultrasonic atomizer, realizing the atomization of the carbon source, and then spraying the atomized carbon source to the surface of the lithium manganese iron phosphate through a plurality of nozzles 802a to complete the drying and coating operation. Embodiment

[0050] The embodiment is a fourth embodiment of the present application, which provides a fine crushing method of a lithium manganese iron phosphate material fine crushing device. Specifically, the method comprises the following steps: S1: Before the lithium manganese iron phosphate material is ground, the height of the tooth ring 505 is adjusted under the magnetic attraction adjustment of the electromagnetic block 503a and the iron block 502a, and then the motor 504 is driven to sequentially open or close the ball valves 405a in the two-by-two corresponding adjustment seats 405, and then the two-by-two corresponding high-pressure airflow pipes 405b are inspected. S2: After the inspection of the high-pressure airflow pipes 405b is completed, the lithium manganese iron phosphate material is sprayed into the internal part of the jet mill body 100 to realize the preliminary grinding of the lithium manganese iron phosphate material. The preliminarily ground lithium manganese iron phosphate material is screened by the classification assembly 101 and then enters the sand mill barrel 201 and is subjected to secondary grinding by the sand mill assembly 203. S3: During the grinding of the lithium manganese iron phosphate material, the pump 703 operates to respectively introduce liquid nitrogen into the first jacket 704 and the second jacket 705 which are sleeved outside the jet mill body 100 and the sand mill barrel 201, so that the internal parts of the jet mill body 100 and the sand mill barrel 201 are in a low-temperature environment to prevent local high temperature from causing manganese oxidation, and the waste heat in the cooling system is introduced into the fluidized bed drying coating machine body 300 for preheating. S4: After preheating, the twice-ground lithium manganese iron phosphate material is input into the fluidized bed drying coating machine body 300, and hot nitrogen is introduced into the fluidized bed drying coating machine body 300. Then, the ultrasonic atomizer is used to atomize the carbon source into droplets. The nanoparticles are combined with the atomized carbon source droplets in a fluidized state to simultaneously complete the drying and coating of the lithium manganese iron phosphate.

[0051] In addition, it should be noted that components not described in detail herein are of conventional design and function.

[0052] It is important to note that the construction and arrangement of the application shown in the various exemplary embodiments is illustrative only. Although only a few embodiments have been described in detail in this disclosure, those skilled in the art who review this disclosure will readily appreciate that many modifications are possible (e.g., variations in sizes, dimensions, structures, shapes and proportions of the various elements, values of parameters, mounting arrangements, use of materials, colors, orientations, etc.) without materially departing from the novel teachings and advantages of the subject matter described in the application. For example, elements shown as integrally formed can be constructed of multiple parts or elements, the position of elements can be reversed or otherwise varied, and the nature or number of elements or positions can be altered or varied. Other substitutions, modifications, changes, and omissions can be made in the design, operating

[0053] Also, to provide a concise description of the exemplary embodiments, not all features of an actual implementation can be described (that is, not all implementations can include all of the features described or optional implementations can include only a subset of the features described).

[0054] It should be appreciated that in the development of any actual implementation, as in any engineering or design project, numerous implementation-specific decisions can be made. Such development efforts might be complex and time-consuming, but would nevertheless be a routine undertaking for those of ordinary skill in the art having the benefit of this disclosure.

[0055] It should be noted that the above examples are only used to illustrate the technical solutions of the present application but not limit the present application, and although the present application is described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present application can be modified or replaced equivalently without departing from the spirit and scope of the present application, and all should be included in the scope of the claims of the present application.

Claims

1. A fine grinding device for lithium manganese iron phosphate material, characterized by: include, An air flow mill body (100), wherein a grading assembly (101) is provided at the top of an inner portion of the air flow mill body (100), and a first material delivery pipe (102) is provided at the top of an outer wall of the air flow mill body (100); a sand mill body (200), the sand mill body (200) being located on one side of the air flow pulverizing body (100), a sand mill cylinder (201) being installed on the top of the sand mill body (200), and a feed pipe (201a) being provided at one end of the top of the sand mill cylinder (201); a fluidized bed drying and coating machine body (300), the fluidized bed drying and coating machine body (300) being located on one side of the sand mill body (200), a top cover (301) being installed on the top of the fluidized bed drying and coating machine body (300), and a feed hopper (301a) being provided on one end of the upper surface of the top cover (301); An opening and closing assembly (400) comprises an annular tube (401) sleeved on the outside of the air flow pulverizing machine body (100) and an adjustment seat (405) evenly spaced above the annular tube (401) along the circumferential direction of the outer wall of the air flow pulverizing machine body (100), a first toothed disc (402) being symmetrically arranged at the front and rear ends above the annular tube (401), and a second toothed disc (403) and a third toothed disc (404) being symmetrically arranged at the front and rear ends on both sides above the annular tube (401); and, An adjustment assembly (500) comprises a ring plate (501) sleeved on the outside of the air flow mill body (100) and sliders (502) fixed to the front and rear ends of the inner wall of the ring plate (501), wherein the slider (502) is slidably mounted inside a slide frame (503), a support plate (501a) is fixed to one end of the bottom of the ring plate (501), a motor (504) is mounted above the support plate (501a), a fourth gear disc (504a) is mounted on the output shaft of the motor (504), and a gear ring (505) is rotatably mounted on the middle portion of the outer wall of the ring plate (501); An iron block (502a) is embedded in the inner center of the slider (502), and electromagnetic blocks (503a) are embedded in the inner top and bottom center of the slide frame (503). The electromagnetic blocks (503a) and the iron blocks (502a) are magnetically attracted to each other. The slide frame (503) is mounted on the outer wall of the air flow mill body (100), and the rack on the outer wall of the fourth toothed disc (504a) is meshed with the rack on the outer wall of the gear ring (505).

2. The device for finely pulverizing a lithium iron manganese phosphate material according to claim 1, characterized by: An end cover (202) is installed on one side wall of the sanding cylinder (201), a second material delivery pipe (202a) is provided at the center of the outer wall of the end cover (202), a sanding assembly (203) is provided inside the sanding cylinder (201), a hot air pipe (301b) is provided on the front end surface of the fluidized bed drying and coating machine body (300), an exhaust pipe (301c) is provided on the other end of the upper surface of the top cover (301), and a discharge pipe (302) is provided at one end of the bottom of the fluidized bed drying and coating machine body (300).

3. The device for finely pulverizing a lithium iron manganese phosphate material according to claim 1, wherein: The bottom center position of the first gear disc (402), the second gear disc (403) and the third gear disc (404) is fixedly provided with a rotating shaft (402a), the bottom end of the rotating shaft (402a) penetrates the top bearing of the adjusting seat (405) and is connected with a ball valve (405a), the ball valve (405a) is rotatably installed in the adjusting seat (405), one side wall of the adjusting seat (405) is provided with a high-pressure gas flow pipe (405b) at the center position, the other side wall of the adjusting seat (405) is provided with a branch pipe (405c) at the center position, and the other end of the branch pipe (405c) is arranged on the outer wall of the ring pipe (401).

4. The device for finely pulverizing a lithium iron manganese phosphate material according to claim 2, characterized by: The stainless steel spiral pipe (600) is further arranged on the inner wall of the sanding cylinder (201), and the two ends of the stainless steel spiral pipe (600) penetrate the inner wall of the sanding cylinder (201) and the inner wall of the end cover (202) respectively.

5. The device for finely pulverizing a lithium iron manganese phosphate material according to claim 1, characterized by: The cooling assembly (700) is further arranged at the rear of the sanding machine body (200), the cooling assembly (700) comprises a liquid nitrogen tank (701) installed at the rear of the sanding machine body (200) and a heat exchange tank (702) installed above the liquid nitrogen tank (701), the liquid outlet end of the liquid nitrogen tank (701) is connected with a first connecting pipe (701a) through a pipe joint, and the other end of the first connecting pipe (701a) is connected with the liquid inlet end of a pump (703) through a pipe joint.

6. The device for finely pulverizing a lithium iron manganese phosphate material according to claim 5, wherein: The liquid outlet end of the pump (703) is connected with a second connecting pipe (703a) and a third connecting pipe (703b) through a three-way joint respectively, the other end of the second connecting pipe (703a) is connected with the liquid inlet end of a first jacket (704) through a pipe joint, the liquid outlet end of the first jacket (704) is connected with a fourth connecting pipe (704a) through a pipe joint, and the other end of the third connecting pipe (703b) is connected with the liquid inlet end of a second jacket (705) through a pipe joint.

7. The device for finely pulverizing a lithium iron manganese phosphate material according to claim 6, characterized by: The liquid outlet end of the second jacket (705) is connected with a fifth connecting pipe (705a) through a pipe joint, and the other ends of the fourth connecting pipe (704a) and the fifth connecting pipe (705a) are connected with a heat exchange pipe (702a) through pipe joints, the heat exchange pipe (702a) is arranged in the heat exchange tank (702), and the other end of the heat exchange pipe (702a) penetrates the bottom of the heat exchange tank (702) and is connected with the liquid inlet end of the liquid nitrogen tank (701) through a pipe joint.

8. The device for finely pulverizing a lithium iron manganese phosphate material according to claim 7, wherein: The gas outlet end on one side wall of the heat exchange tank (702) is connected with a sixth connecting pipe (706a) through a pipe joint, the other end of the sixth connecting pipe (706a) is connected with the air inlet end of a fan (706) through a pipe joint, the air outlet end of the fan (706) is connected with a seventh connecting pipe (706b) through a pipe joint, and the other end of the seventh connecting pipe (706b) is connected with the air inlet end of the rear end face of the fluidized bed drying coating machine body (300) through a pipe joint.

9. The device for finely pulverizing a lithium iron manganese phosphate material according to claim 1, characterized by: Also comprising a atomization assembly (800) arranged in the top cover (301), the atomization assembly (800) comprises a flow divider (801) arranged in the top cover (301), the bottom of the flow divider (801) is horizontally arranged with a spray pipe (802), the bottom of the spray pipe (802) is arranged with a spray head (802a) from front to back.

10. A pulverization method of a fine pulverization device of a lithium iron manganese phosphate material, characterized by: The fine grinding device of the lithium manganese iron phosphate material according to any one of claims 4-9 performs fine grinding operation on the lithium manganese iron phosphate material according to the following steps: S1: Before grinding the lithium manganese iron phosphate material, the height of the tooth ring (505) is adjusted under the magnetic attraction adjustment of the electromagnetic block (503a) and the iron block (502a), and then the motor (504) is driven to open or close the ball valve (405a) in the corresponding adjustment seat (405) in two groups in turn, and then the high-pressure airflow pipe (405b) corresponding to the two groups is tested; S2: After the high-pressure airflow pipe (405b) test is completed, the lithium manganese iron phosphate material is sprayed into the airflow pulverizer body (100), and the preliminary grinding of the lithium manganese iron phosphate material is realized, and the lithium manganese iron phosphate material after preliminary grinding is screened by the grading assembly (101) and then enters the sand mill cylinder (201), and is subjected to secondary grinding by the sand grinding assembly (203); S3: During the grinding process of the lithium manganese iron phosphate material, the pump (703) is operated to introduce liquid nitrogen into the first jacket (704) and the second jacket (705) outside the airflow pulverizer body (100) and the sand mill cylinder (201) respectively, so that the inside of the airflow pulverizer body (100) and the sand mill cylinder (201) are in a low-temperature environment, preventing local high temperature from causing manganese oxidation, and the waste heat in the cooling system is introduced into the fluidized bed drying and coating machine body (300) for preheating; S4: After preheating, the lithium manganese iron phosphate material ground twice is input into the fluidized bed drying and coating machine body (300), and at the same time, hot nitrogen is input into the fluidized bed drying and coating machine body (300), then the carbon source is atomized into droplets using an ultrasonic atomizer, and the nanometer particles are combined with the atomized carbon source droplets in a fluidized state, and the drying and coating of the lithium manganese iron phosphate material are simultaneously completed.

Images