Disturbance enhancing assembly for material powder conveying

Abstract

The utility model relates to a disturbance enhancing assembly for powder conveying, which comprises a first barrel, a rotating shaft arranged in the first barrel, a driving mechanism in transmission connection with the rotating shaft, a second inlet and a second outlet, the second inlet and the second outlet are arranged on the first barrel, and the rotating shaft extends along the length direction of the first barrel. A plurality of paddles are arranged on the rotating shaft and are sequentially distributed along the length direction of the rotating shaft. According to the disturbance enhancing assembly, the smoothness of the pneumatic conveying process of material powder containing blocks can be effectively improved; and meanwhile, in the pneumatic conveying process, the material powder is further refined, and preparation is made for better proceeding of subsequent procedures. The pneumatic conveying system is simple and compact in structure, the pneumatic conveying smoothness can be effectively improved, the possibility of blocking parts such as pipelines in the process of conveying powder to downstream procedures is reduced, and the pneumatic conveying system has good industrial application prospects.

Description

[0001] The present application is a divisional application of the utility model patent application with the application number 202421991100.0, the application date of August 16, 2024, and the utility model title of a disturbance enhancement assembly for powder conveying, a pneumatic conveying system, and a roasting system. TECHNICAL FIELD

[0002] The utility model relates to a disturbance enhancement assembly for powder conveying, a pneumatic conveying system, and a roasting system, belonging to the field of powder pneumatic conveying equipment. BACKGROUND

[0003] With the explosive growth of the new energy vehicle market, the first batch of new energy vehicle power storage batteries has entered the aging stage, leading to the arrival of the power battery "retirement tide". If these retired power batteries are not properly handled, they will pose a great threat to the environment and safety. Therefore, the recycling of power batteries has become a pain point and hot issue for the rapid development of the current industry.

[0004] Waste lithium battery powder is usually a powder-like substance obtained after waste lithium batteries are disassembled (optional process), crushed, and screened, etc. It mainly includes waste lithium battery powder, positive and negative mixed powder, positive powder, or mixed powder containing the aforementioned materials. Roasting of waste lithium battery powder is one of the common processes in the resource processing of waste lithium battery powder. One of the common ways is to heat the waste lithium battery powder with air, and after reaching the roasting temperature, the waste lithium battery powder reacts with oxygen in the air to release a large amount of heat energy, wherein the heating process needs to absorb a large amount of heat. Therefore, the development of waste lithium battery powder roasting technology is of great significance to the treatment and recycling of retired new energy vehicle batteries and the development of the waste battery treatment industry.

[0005] Chinese invention patent specification CN117691230A discloses a pretreatment method and a wet recovery method for waste lithium iron phosphate battery black powder. The pretreatment method includes the following steps: placing the waste lithium iron phosphate battery black powder in a rotary heating furnace and performing roasting treatment in an air atmosphere. The roasting process produces a roasted material. The pretreatment method is used for pretreatment of waste lithium iron phosphate battery black powder before wet recovery. It mainly uses the roasting method in an air atmosphere to oxidize divalent iron to trivalent iron in the black powder and remove impurities such as binders and carbon black. Thus, although no oxidizing agent and organic solvent are needed during the subsequent wet recovery, the amount of waste liquid is greatly reduced. However, the patent application does not consider how to transport the material to the rotary heating furnace.

[0006] In waste battery material powder processing enterprises, the raw material workshop for storing waste battery material powder and the calcination workshop usually have a certain distance, and the waste battery material powder often contains toxic waste powder, which is not suitable for transfer by conveyor belt, nor is it suitable for manual transfer by feeding trolley. Therefore, the applicant thought of using pneumatic conveying to realize the transportation of waste battery material powder during the research and development process. However, the waste battery material powder often contains organic matter such as binders and electrolytes, which can cause the waste battery material powder to agglomerate or clump during storage in the raw material workshop. Using conventional pneumatic conveying mechanisms can cause poor conveying or even blockage, and is not conducive to the efficient and full calcination reaction. Adding a powder scattering mechanism upstream of the conventional pneumatic conveying mechanism can increase the complexity of the conveying mechanism and cause toxic waste powder dust pollution. Practical new type content

[0007] In view of the deficiencies of the prior art, one of the purposes of the present application is to provide a disturbance enhancement assembly for the pneumatic conveying process of material powder, especially material powder containing lumps, to improve the smoothness of the pneumatic conveying process of the material powder and increase the flow state turbulence of the material flow in the disturbance enhancement assembly. The second purpose of the present application is to provide a pneumatic conveying system. The third purpose of the present application is to provide a calcination system for waste battery material powder.

[0008] To solve the above technical problems, the technical scheme adopted by the present application is as follows:

[0009] A disturbance enhancement assembly includes a first cylinder, a rotating shaft arranged in the first cylinder, a driving mechanism in transmission connection with the rotating shaft, and a second inlet and a second outlet arranged on the first cylinder. The rotating shaft extends along the length direction of the first cylinder, and a plurality of paddles are arranged on the rotating shaft. The plurality of paddles are distributed along the length direction of the rotating shaft.

[0010] In this way, when the pneumatic conveying system is provided with the disturbance enhancement assembly of the present application, the coarse mixture of gas medium and material powder can enter the first cylinder through the second inlet, and the plurality of paddles distributed along the length direction of the rotating shaft rotate with the rotating shaft to produce strong disturbance to the gas-solid coarse mixture, thereby enhancing the turbulence intensity of the gas-solid coarse mixture. The material powder, especially the lumps therein, is further repeatedly scattered and mixed more uniformly with the gas medium to form a more homogeneous and better flowing gas-solid mixture, thereby effectively improving the smoothness of the pneumatic conveying process of the material powder containing lumps. At the same time, the material powder is further refined during the pneumatic conveying process, which prepares for the better performance of the subsequent process.

[0011] In addition, the applicant finds that, under the action of the disturbance enhancement assembly, the waste battery material powder is helped to expose new surfaces and more fully contact and exchange heat with the hot air, effectively promoting the volatilization and separation of residual electrolyte, binder and other organic matters in the waste battery material powder, and thus obtaining waste battery fine powder with good fluidity, low organic matter content and low agglomeration tendency, effectively improving the smoothness of pneumatic conveying and reducing the possibility of clogging of pipelines and other components during the conveying of the waste battery material powder to the roasting furnace. Moreover, after being treated by the disturbance enhancement assembly, the particle size of the waste battery fine powder participating in the subsequent roasting process is further refined, and the amount of organic matter contained is very low, so that the waste battery fine powder and the active substances contained therein can be more fully contacted with the hot air, and the competitive reaction between the organic matter and the air is greatly reduced, thereby making the roasting reaction more efficient and complete, and thus effectively improving the roasting efficiency and roasting degree and obtaining better roasting effect. In addition, the roasting reaction stage is a high-temperature reaction stage, and since the amount of organic matter contained in the waste battery fine powder is very low, the possibility of generating toxic and harmful gases such as fluorides, nitrogen oxides and dioxins due to the oxidation and combustion reaction of the organic matter is greatly reduced, effectively reducing the amount of toxic and harmful gases in the high-temperature flue gas, so it is more environmentally friendly, and the subsequent tail gas treatment burden and cost can also be greatly reduced.

[0012] Further, the second inlet is located at or adjacent to one end of the first cylinder, and the second outlet is located at or adjacent to the other end of the first cylinder, so that the residence time of the material in the first cylinder and the collision frequency with the paddle and other components can be ensured, and thus good dispersion and homogenization effects can be ensured.

[0013] Further, the second outlet is located at or adjacent to one end of the first cylinder, and the second outlet is located at or adjacent to the other end of the first cylinder, so that the residence time of the material in the first cylinder and the collision frequency with the paddle and other components can be ensured, and thus good dispersion and homogenization effects can be ensured.

[0014] Further, the first cylinder has an angle of 0-90°, preferably 30-90°, with the horizontal plane.

[0015] In this way, the fully dispersed material can be smoothly transported, and the caked material or the material with a still relatively large particle size can be retained in the lower part of the first cylinder due to its own gravity and can be transported to the downstream side after being dispersed by the continuous airflow and disturbance.

[0016] Further, the paddle includes a plurality of blades, which are uniformly distributed along the circumference of the rotating shaft. Further, the paddle includes at least 2 blades, preferably 3 blades, which are uniformly distributed along the circumference of the rotating shaft.

[0017] Further, the blades of the axially adjacent paddles are staggered with each other. In this way, the turbulence and flow path in the disturbance enhancement assembly can be further improved, and the collision and contact between the powder and the blades can be further improved, so that the scattering and homogenization effect can be further improved, and when the gas medium is hot air, the separation effect of the heated and volatile substances can be further improved.

[0018] Further, the blades are inclined along the circumference of the rotating shaft, so that the included angle between the width direction of the blades and the cross section of the first cylinder is 30-60°. In this way, while ensuring the disturbance effect, the effective suction is improved when the rotating shaft drives the paddles to rotate, so that the material flows more smoothly in the disturbance enhancement assembly, and the powder is prevented from accumulating at the blades.

[0019] Further, at least one of the inner wall of the first cylinder, the rotating shaft and the paddles is made of a heat-conducting material; preferably, the heat-conducting material includes one of magnesium alloy, aluminum alloy, steel and copper alloy. In this way, the above-mentioned related components have good heat-conducting and heat-storing capacity, and during operation, hot gas medium can be used, the temperature of the above-mentioned components rises rapidly, so that the powder can be heated multiple times and continuously through solid-solid interface conduction during the collision and contact with them in addition to heat exchange with the hot gas medium, the heating effect is improved, the separation of volatile substances in the powder is more effectively promoted, and the powder reaction interface and heat transfer interface are fully exposed, so that the conveying, pretreatment and subsequent treatment effect of the powder are further optimized.

[0020] Further, the gas-solid mixer includes a second cylinder having an inlet end and an outlet end distributed along the axial direction, and the first inlet, the gas inlet and the first outlet are arranged on the second cylinder, the first inlet is located at or near the inlet end of the second cylinder, the gas inlet is located at or near the inlet end of the second cylinder, and the first outlet is located at or near the outlet end of the second cylinder.

[0021] Further, the included angle between the axial direction of the second cylinder and the horizontal plane is 0-30°.

[0022] Further, the position of the first outlet is higher than the position of the first inlet. In this way, the fully dispersed material can be smoothly transported, and the caked material or the material with a relatively large particle size can be retained in the front end of the gas-solid mixing device due to its own gravity, and can be transported to the downstream side after continuous airflow disturbance and mechanical dispersion.

[0023] Further, the second cylinder is provided with a stirring mechanism, and the stirring mechanism includes a plurality of dispersion blades arranged along the axial direction of the second cylinder.

[0024] Further, the lengths of the plurality of dispersion blades decrease first and then increase along the material transmission direction in the gas-solid mixer, and the densities of the plurality of dispersion blades increase in sequence along the material transmission direction in the gas-solid mixer.

[0025] Thus, the lengths of the plurality of dispersion blades are distributed in a broken line shape of first decreasing and then increasing, and the densities of the dispersion blades are sequentially increased, and through the cooperation of the blade length and the density, the material and the hot air are fully mixed and heat transferred, the blocky material is effectively scattered, and the material conveying space is fully ensured.

[0026] Further, the air inlet pipe is arranged, the rotating shaft is a hollow pipe, the outlet of the air inlet pipe is rotatably communicated with one end of the rotating shaft through a rotary joint, and the other end of the rotating shaft is sealed; the blade has a cavity, the cavity is communicated with the rotating shaft, and a plurality of air holes are arranged on the blade and communicated with the cavity. In this way, the gas medium (such as hot air) can be further introduced through the air inlet pipe, the gas medium enters the rotating shaft and flows out through the air holes on the blade. On the one hand, when the gas medium is sprayed out through the air holes on the blade, it will form an impact on the material flow in the disturbance enhancement assembly in another dimension, further improving the flow state turbulence, which helps to fully utilize the energy in the gas medium to improve the scattering and heating effect, and further promotes the separation of volatile substances, and fully prepares for the next stage of roasting. On the other hand, when the gas medium is hot air, the temperature in the first cylinder can be further increased, and the temperature of the high-thermal-conductivity components such as the rotating shaft and the paddle can be further increased. Through the collision and contact between the material and the blade components, solid-solid heat transfer is realized to more fully heat the powder, further improving the heating and separation effect of volatile substances. In addition, the gas medium introduced through the air inlet pipe can dilute the original gas-solid mixed material, reduce the concentration of volatile substances in the gas phase, and reduce the partial pressure, which helps to more fully volatilize the volatile substances in the powder.

[0027] Preferably, a third valve is arranged on the air inlet pipe to more conveniently control whether the gas medium is introduced and the amount of the gas medium.

[0028] Further, the number of the air holes on the blades of the paddles gradually increases from the second inlet to the second outlet. In this way, when the gas medium is hot gas medium, the hot gas medium is sprayed out at high speed from the air holes, and the hot gas medium forms a stable or increasing output flow in the direction from the inlet to the outlet. On the one hand, it ensures that the hot gas medium carrying sufficient heat exchanges heat with the material preheated to a certain degree near the second outlet, maximizes the use of the heat in the hot gas medium, and ensures that the material is sequentially heated in the advancing direction, reduces the temperature difference between the material and the hot gas medium at the second outlet, and on the other hand, the material wraps a sufficient amount of hot gas medium to enter the subsequent gas-solid separator stage, reduces the temperature drop in the gas-solid separation stage, and better ensures the preheating effect of the powder.

[0029] Based on the same inventive concept, the utility model also provides a pneumatic conveying system, including the conveying pipe and gas-solid separator for pneumatic conveying, the conveying pipe is equipped with as above-mentioned disturbance enhancement assembly.

[0030] In this way, the gas-solid coarse mixture enters the disturbance enhancement assembly through the conveying pipe, and the multiple blades arranged along the length direction of the rotating shaft successively disturb the gas-solid coarse mixture intensively, thereby enhancing the turbulence intensity of the gas-solid coarse mixture, and the coarse particles of the powder are further repeatedly broken and refined, thereby effectively improving the smoothness of the pneumatic conveying and reducing the possibility of the powder blocking the pipeline and other components during the conveying to the downstream process.

[0031] Further, the system further comprises a gas-solid mixer, which is provided with a first inlet, an air inlet and a first outlet; and the disturbance enhancement assembly is arranged between the first outlet and the gas-solid separator. In this way, the powder to be conveyed and the gas medium enter the gas-solid mixer through the first inlet and the air inlet respectively, and the gas medium is preliminarily mixed and broken with the powder in the gas-solid mixer, so that the lumps in the powder are preliminarily broken, and the powder is fully dispersed and suspended in the gas medium to form a gas-solid coarse mixture; then, the gas-solid coarse mixture enters the disturbance enhancement assembly and is further repeatedly broken and refined, thereby effectively improving the smoothness of the pneumatic conveying, and through the two-stage mixing and breaking, the fineness of the powder can be further improved, and the possibility of the powder blocking the pipeline and other components during the conveying to the downstream process can be further reduced.

[0032] Further, the exhaust port of the gas-solid separator is provided with a first fan, which provides driving force to drive the gas phase medium and the material to move along a predetermined path in the pneumatic conveying system. Alternatively, the first fan can also be arranged at other positions, such as on the conveying pipe. Further, multiple disturbance enhancement assemblies are connected in parallel and / or in series between the first outlet and the gas-solid separator. In this way, by connecting multiple disturbance enhancement assemblies in parallel, the conveying capacity and the breaking and homogenizing effect can be ensured, the processing efficiency can be improved, and the system can run more smoothly; by connecting multiple disturbance enhancement assemblies in series, the residence time of the gas-solid mixture in the disturbance enhancement assembly is further prolonged, the breaking and homogenizing effect is further improved, and the system can run more smoothly. In addition, the inclination angles of different disturbance enhancement assemblies can be arranged respectively, for example, some disturbance enhancement assemblies are arranged vertically, and some disturbance enhancement assemblies are arranged along the horizontal direction, so as to further enhance the disturbance effect.

[0033] Further, the system further comprises a transition bin in communication with the discharge port of the gas-solid separator, the bottom of the transition bin is provided with a third outlet, and the third outlet is provided with a fourth valve. In this way, the transition bin can play a role of buffering and blocking the discharge port of the gas-solid separator, so that the gas in the gas-solid separator flows to the exhaust port thereof, and when the fourth valve is in an open state, the gas on the downstream side enters the gas-solid separator.

[0034] Based on the same inventive concept, the present application also provides a roasting system for waste battery powder, which comprises the disturbance enhancement assembly or the pneumatic conveying system as described above.

[0035] Optionally, the battery is an alkali metal battery, and further, the alkali metal battery includes one or more of a lithium battery, a sodium battery.

[0036] Compared with the prior art, the disturbance enhancement assembly can effectively improve the smoothness of the pneumatic conveying process of the material powder containing lumps, and further refine the material powder during the pneumatic conveying process, thereby preparing for better subsequent processes. The pneumatic conveying system has a simple and compact structure, the material powder and the gas medium are preliminarily mixed and scattered by the gas-solid mixer, and the gas-solid mixed material is further repeatedly scattered and refined by the disturbance enhancement assembly, so that the smoothness of pneumatic conveying can be effectively improved, the possibility of blocking of the pipeline and other components during conveying of the material powder to the downstream process can be reduced, and the good industrial application prospect can be realized, so that the transfer and transportation of the material powder such as waste battery material powder containing lumps between different treatment workshops can be well satisfied. In addition, the disturbance enhancement assembly and the pneumatic conveying system of the utility model have wide applicability to raw materials, and can be applied to impure powder, wet powder and caked powder. BRIEF DESCRIPTION OF DRAWINGS

[0037] Figure 1 is a structural diagram of the disturbance enhancement assembly of embodiment 1 of the utility model.

[0038] Figure 2 is a perspective view of the disturbance enhancement assembly of embodiment 1 of the utility model.

[0039] Figure 3 is a perspective view of the rotating shaft and the paddle of embodiment 1 of the utility model.

[0040] Figure 4 is a structural diagram of the pneumatic conveying system of embodiment 6 of the utility model.

[0041] Figure 5 is a structural diagram of the roasting system of embodiment 12 of the utility model.

[0042] Figure 6 is a structural diagram of the pneumatic conveying system of embodiment 13 of the utility model.

[0043] Figure 7 is a perspective view of the disturbance enhancement assembly of embodiment 4 of the utility model.

[0044] Figure 8 is a perspective view of the rotating shaft and the paddle of embodiment 4 of the utility model.

[0045] Figure 9 is a sectional view of the rotating shaft of embodiment 4 of the utility model.

[0046] Figure 10is a structure diagram of the baking system of embodiment 14 of the utility model. DETAILED DESCRIPTION

[0047] The utility model will be explained in detail below with reference to the drawings and in combination with embodiments. It should be noted that the embodiments in the utility model and the features in the embodiments can be combined with each other without conflict. For the convenience of description, if the words 'up', 'down', 'left', 'right' appear below, they only mean the same direction as the up, down, left and right of the drawing itself, and do not limit the structure.

[0048] Embodiment 1

[0049] Reference Figures 1-3 A kind of disturbance enhancement assembly, including first cylinder 2.71, the rotating shaft 2.72 being arranged in first cylinder 2.71, the drive mechanism being connected with rotating shaft 2.72, and second inlet 2.74 and second outlet 2.75 being arranged on first cylinder 2.71, the rotating shaft 2.72 extends along the length direction of first cylinder 2.71, a plurality of paddles 2.73 are arranged on rotating shaft 2.72, and the plurality of paddles 2.73 are sequentially distributed along the length direction of rotating shaft 2.72.

[0050] Second inlet 2.74 is communicated with first outlet 2.63;Second inlet 2.74 is located on the side wall of one end (lower end) of first cylinder, and second outlet 2.75 is located on the side wall of the other end (upper end) of first cylinder. The position of second outlet is higher than the position of second inlet. The angle between the axial direction of first cylinder 2.71 and horizontal plane is 90 °. The paddle 2.73 includes 3 blades, and the 3 blades are uniformly distributed along the circumferential direction of rotating shaft 2.72.

[0051] Embodiment 2

[0052] This embodiment has the same structure as embodiment 1, and the blades of the axially adjacent paddles are staggered.

[0053] Embodiment 3

[0054] This embodiment has the same structure as embodiment 2, and the blades are inclined along the circumferential direction of the rotating shaft, so that the angle between the width direction of the blade and the cross section of the first cylinder is 45 °. The inner wall of first cylinder 2.71, rotating shaft 2.72 and paddle 2.73 are all made of steel.

[0055] Embodiment 4

[0056] Repeat embodiment 1, the difference is only that: reference Figures 7-9, the disturbance enhancement assembly further comprises an air inlet pipe, the air inlet pipe is provided with a third valve 6.6 (ventilation butterfly valve), the rotating shaft 2.72 is a hollow pipe, the outlet of the air inlet pipe is rotatably communicated with one end of the rotating shaft 2.72 through a rotary joint, and the other end of the rotating shaft 2.72 is sealed; the blade has a cavity 2.732, the cavity 2.732 is communicated with the rotating shaft 2.72, a plurality of air holes 2.731 are arranged on the blade and communicated with the cavity, and the upper surface of the blade is provided with the air holes.

[0057] Example 5

[0058] Example 4 is repeated, and the main difference is that the number of air holes on the blade of each paddle 2.73 gradually increases from the second inlet 2.74 to the second outlet 2.75.

[0059] Example 6

[0060] Referring to Figure 4 , a pneumatic conveying system comprises a gas-solid mixer 2.6 and a gas-solid separator 2.1, the gas-solid mixer 2.6 is provided with a first inlet 2.61, an air inlet 2.62 and a first outlet 2.63, and the exhaust port of the gas-solid separator 2.1 is communicated with a first fan 2.2 (high-pressure fan); the disturbance enhancement assembly as described in Example 3 is arranged between the first outlet 2.63 and the gas-solid separator 2.1. The discharge port of the gas-solid separator 2.1 is communicated with a transition bin 2.4, the bottom of the transition bin 2.4 is provided with a third outlet, and the third outlet is provided with a fourth valve 2.5. The air inlet 2.62 is communicated with a first valve 6.5.

[0061] Example 7

[0062] In addition to having the same structure as Example 6, the gas-solid mixer 2.6 is provided with a first inlet 2.61, an air inlet 2.62 and a first outlet 2.63, and a stirring mechanism arranged in the gas-solid mixer. The gas-solid mixer further comprises a second cylinder, and the stirring mechanism is arranged in the second cylinder. The second cylinder has an inlet end and an outlet end distributed along the axial direction, and the first inlet, the air inlet and the first outlet are arranged on the second cylinder. The first inlet is located at the inlet end of the second cylinder, the air inlet is located at the inlet end of the second cylinder, and the first outlet is located at the outlet end of the second cylinder. The angle between the axial direction of the second cylinder and the horizontal plane is 30°. The stirring mechanism of the gas-solid mixer comprises a plurality of dispersion blades arranged along the axial direction. The outlet of the first fan 2.2 is communicated with a tail gas treatment system 8, so as to treat the gas medium after gas-solid separation; and the gas-solid separator 2.1 is a bag-type dust collector.

[0063] Example 8

[0064] The embodiment has the same structure as that of Embodiment 7, and in addition, the length of the plurality of dispersion blades decreases first and then increases along the material transmission direction in the gas-solid mixer, and the density of the plurality of dispersion blades increases in turn along the material transmission direction in the gas-solid mixer.

[0065] Embodiment 9

[0066] The embodiment has the same structure as that of Embodiment 6, and in addition, the position of the first outlet 2.63 is higher than the position of the first inlet 2.61, the angle between the axial direction of the second cylinder and the horizontal plane is 15°, and the angle between the axial direction of the first cylinder and the horizontal plane is 75°.

[0067] Embodiment 10

[0068] The embodiment has the same structure as that of Embodiment 6, and in addition, the number of the disturbance enhancement assemblies is 3; the gas-solid mixer 2.6, each disturbance enhancement assembly, and the gas-solid separator 2.1 are connected in turn.

[0069] Embodiment 11

[0070] The embodiment has the same structure as that of Embodiment 6, and in addition, the three disturbance enhancement assemblies are connected between the gas-solid mixer 2.6 and the gas-solid separator 2.1.

[0071] Embodiment 12

[0072] Referring to Figure 5 , the applicant integrates the pneumatic conveying system described in Embodiment 7 into a self-developed roasting system to form a roasting system for waste lithium battery material powder, which comprises a stock bin assembly 1, a gas-solid mixer 2.6, a disturbance enhancement assembly 2.7, a gas-solid separator 2.1, a roasting furnace 3, an indirect heat exchanger 6, and a tail gas treatment system 8.

[0073] The stock bin assembly 1 comprises a stock bin body 1.1 for temporarily storing waste lithium battery material powder, and a first material level meter 1.2 for monitoring the material level height is arranged in the stock bin body; the bottom of the stock bin body is communicated with the first inlet 2.61 through a fifth valve 1.3 (a rotary seal valve, which facilitates quantitative feeding).

[0074] The feeding port of the roasting furnace 3 is communicated with the discharge port of the gas-solid separator 2.1 through a feeding mechanism 3.1 (a screw feeding mechanism);

[0075] The indirect heat exchanger 6 has a first medium inlet, a first medium outlet, a second medium inlet and a second medium outlet, the first medium inlet and the first medium outlet are communicated with each other, the second medium inlet and the second medium outlet are communicated with each other, the first medium inlet is communicated with the calcination flue gas outlet, the first medium outlet is communicated with the tail gas treatment system 8 through the second fan 7; the second medium inlet is provided with the third fan 6.3, the second medium outlet is communicated with the fourth valve 6.2 (ventilation butterfly valve), the outlet of the fourth valve 6.2 is connected with the first valve 6.5 (ventilation butterfly valve) and the second valve 6.4 (ventilation butterfly valve), the outlet of the first valve 6.5 is communicated with the air inlet 2.62 of the gas-solid mixer 2.6, and the outlet of the second valve 6.4 is communicated with the air inlet of the calcination furnace 3.

[0076] In the calcination system, the pneumatic conveying system 2 realizes pneumatic conveying of waste lithium battery material powder, and completes preheating, refinement, and removal of organic matter of the waste lithium battery material powder and other aspects of pretreatment; the first fan 2.2 provides suction for the pneumatic conveying system 2, so that the waste lithium battery material powder and part of the hot air are sucked into the gas-solid mixer, and under the high-speed stirring action of the dispersion blade, the waste lithium battery material powder and the hot air are fully mixed and suspended in the hot air. In the gas-solid separator, the waste lithium battery material powder is separated from the air, the waste lithium battery material powder enters the transition bin 2.4, and the obtained gas enters the tail gas treatment system through the first fan 2.2.

[0077] The transition bin 2.4 is provided with a second material level meter 2.3 to monitor the material level height in the transition bin, so as to ensure that the transition bin 2.4 and the material cooperate to form a good seal, prevent gas containing organic volatiles and separated materials from penetrating into the calcination furnace, and also prevent gas in the calcination furnace from penetrating into the gas-solid separator in the opposite direction; the third outlet is communicated with the inlet of the feeding mechanism 3.1 through the fourth valve 2.5 (rotary seal valve).

[0078] The roasting furnace 3 is a rotary heating furnace; the rotary heating furnace has a rotary cylinder assembly 3.2, and the feeding mechanism 3.1 and the second valve 6.4 are both in communication with the feeding end of the rotary cylinder assembly 3.2; the discharging end of the rotary cylinder assembly 3.2 is provided with a discharging cover 3.4 which is rotatably connected with the rotary cylinder assembly 3.2, the bottom of the discharging cover 3.4 is provided with a roasting material outlet, the roasting material outlet is in communication with a cooling device 3.6 through a sixth valve (rotary sealing valve) 3.5 to cool and cool down the roasting material; the top of the discharging cover 3.4 is in communication with the first medium inlet. The rotary cylinder assembly 3.2 is provided with a heating module 3.3 to heat the material in it. The waste lithium battery material powder and hot air are further heated in the roasting furnace, a roasting reaction occurs, and a large amount of heat is released. Since the waste lithium battery material powder and air have been heated before entering the rotary cylinder assembly, they have reached a certain high temperature state, so compared with the waste lithium battery material powder and air at room temperature state roasting in the rotary cylinder assembly, they will soon reach the roasting reaction temperature after absorbing a small amount of heat, which can greatly reduce the heating time and heating energy consumption; moreover, the waste lithium battery material powder has been fully dispersed and the organic matter has been removed during pneumatic conveying, so that the roasting reaction can be more efficient, sufficient and smooth.

[0079] A dust removal mechanism is arranged between the first medium inlet and the roasting flue gas outlet of the discharging cover 3.4 to remove dust particles contained in the high-temperature flue gas; the dust removal mechanism includes a cyclone dust collector 4 and a high-temperature dust collector 5, and the roasting flue gas outlet, the cyclone dust collector 4, the high-temperature dust collector 5 and the first medium inlet are sequentially communicated. The discharge port of the cyclone dust collector 4 and the discharge port of the high-temperature dust collector 5 are both in communication with the cooling device 3.6. Optionally, the high-temperature dust collector is a high-temperature dust collector known in the art, such as CN101559307A, CN110743265B, etc.

[0080] In this way, pneumatic conveying can effectively solve the problem of transferring and conveying waste lithium battery material powder between different workshops without causing dust pollution, and the efficiency is also high; at the same time, the hot air produced by the indirect heat exchanger not only realizes the pneumatic conveying of the waste lithium battery material powder, but also performs preheating and dispersion of the waste lithium battery material powder during pneumatic conveying, which helps to ensure the smoothness of pneumatic conveying and improve the subsequent roasting efficiency and roasting completeness.

[0081] In the roasting system, the high-temperature flue gas generated by the roasting furnace during the air roasting process of the waste lithium battery material powder can be heat-exchanged with air in the indirect heat exchanger to achieve the cooling of the high-temperature flue gas, facilitating subsequent treatment and discharge. At the same time, part of the hot air generated by the indirect heat exchanger enters the gas-solid mixer, and the hot air is preliminarily mixed, dispersed and preheated with the waste lithium battery material powder in the gas-solid mixer, so that the waste lithium battery material powder is fully dispersed and suspended in the hot air to form a gas-solid coarse mixture. Subsequently, the gas-solid coarse mixture enters the disturbance enhancement assembly, and the multiple paddles distributed along the length direction of the rotating shaft generate strong disturbance to the gas-solid coarse mixture, enhancing the turbulent intensity of the gas-solid coarse mixture. The coarse particles of the waste lithium battery material powder are further repeatedly dispersed, exposing new surfaces, which can effectively promote the volatilization and separation of the residual electrolyte, binder and other organic matters in the waste lithium battery material powder, and further obtain fine waste battery powder with good fluidity, low organic matter content and low agglomeration tendency, effectively improving the smoothness of pneumatic conveying, reducing the possibility of blockage of the pipeline and other components during the conveying of the waste lithium battery material powder to the roasting furnace, and eliminating the need for gas-solid separation during the preheating process, thus achieving simple and efficient equipment and operation with low failure rate.

[0082] In addition, under the favorable influence of the pneumatic conveying system, the spiral feeding mechanism also does not need to worry about the agglomeration or caking of the waste lithium battery material powder due to extrusion during the conveying of the fine waste battery powder to the roasting furnace, which affects the subsequent roasting effect.

[0083] During roasting, the preheated and fully dispersed fine waste battery powder and hot air are simultaneously input into the roasting furnace. The fine waste battery powder and hot air only need to absorb a small amount of heat to quickly reach the required temperature for roasting reaction, which helps to reduce the required heating time and heating energy consumption, thereby effectively saving energy consumption, realizing the recycling of heat, and improving energy utilization.

[0084] Moreover, the particle size of the input fine waste battery powder has been further refined, and the amount of organic matter contained therein is already quite low. The fine waste battery powder and the active substances contained therein can be more fully contacted with the hot air, and the competitive reaction between the organic matter and the air is greatly reduced, thereby making the roasting reaction more efficient and thorough, further improving the roasting efficiency and roasting degree, and achieving better roasting effect.

[0085] In addition, the roasting reaction stage is a high-temperature reaction stage. Since the amount of organic matter contained in the fine waste battery powder is already quite low, the possibility of generating toxic and harmful gases such as fluorides, nitrogen oxides and dioxins due to the oxidation and combustion reaction of organic matter in this stage is greatly reduced, effectively reducing the amount of toxic and harmful gases in the high-temperature flue gas, thus being more environmentally friendly, and also greatly reducing the subsequent tail gas treatment burden and cost.

[0086] It can be seen that the roasting system developed by the applicant has the above disturbance enhancement assembly and pneumatic conveying system, the high-temperature flue gas and air are subjected to heat exchange treatment through the indirect heat exchanger, part of the hot air is used for pneumatic conveying and pretreatment of the waste lithium battery material powder, and part of the hot air is used for air roasting treatment, so that the conveying smoothness of the waste lithium battery material powder is improved, the raw material conveying problem faced in the industrial treatment process is solved, the full recycling of heat is realized, energy saving and consumption reduction are beneficial, the air roasting effect of the waste lithium battery material powder is better, and the amount of toxic and harmful gas generated is lower. Further, the roasting system developed by the applicant has better industrial application prospect, and helps to realize the industrial roasting treatment of the waste lithium battery material powder.

[0087] Example 13

[0088] Referring to Figure 6 A pneumatic conveying system comprises a gas-solid mixer 2.6 and a gas-solid separator 2.1, the gas-solid mixer 2.6 is provided with a first inlet 2.61, an air inlet 2.62 and a first outlet 2.63, the exhaust port of the gas-solid separator 2.1 is communicated with a first fan 2.2 (high-pressure fan); the first outlet 2.63 and the gas-solid separator 2.1 are provided with the disturbance enhancement assembly as described in Example 4. The discharge port of the gas-solid separator 2.1 is communicated with a transition bin 2.4, the bottom of the transition bin 2.4 is provided with a third outlet, and the third outlet is provided with a fourth valve 2.5. The air inlet 2.62 is communicated with a first valve 6.5.

[0089] Example 14

[0090] Example 12 is repeated, and the main difference is that referring to Figure 10 The pneumatic conveying system described in Example 13 is integrated into the roasting system independently developed by the applicant, forming a roasting system for waste lithium battery material powder; wherein the inlet of the air inlet pipe is communicated with the second medium outlet.

[0091] The content illustrated in the above examples should be understood as that the examples are only used to more clearly illustrate the present application, and are not used to limit the scope of the present application, and after reading the present application, various equivalent modifications of the present application by those skilled in the art all fall within the scope defined by the appended claims of the present application.

Claims

1. A turbulence enhancing assembly for powder delivery, comprising: The device comprises a first cylinder (2.71), a rotating shaft (2.72) arranged in the first cylinder (2.71), a driving mechanism in transmission connection with the rotating shaft (2.72), a second inlet (2.74) and a second outlet (2.75) arranged on the first cylinder (2.71), the rotating shaft (2.72) extends along the length direction of the first cylinder (2.71), a plurality of paddles (2.73) are arranged on the rotating shaft (2.72), the plurality of paddles (2.73) are sequentially arranged along the length direction of the rotating shaft (2.72), and each paddle (2.73) comprises a plurality of blades.

2. The perturbation enhancement assembly of claim 1, wherein, The second inlet (2.74) is located at or near one end of the first cylinder (2.71), and the second outlet (2.75) is located at or near the other end of the first cylinder (2.71).

3. The perturbation enhancement assembly of claim 2, wherein, The position of the second outlet (2.75) is higher than that of the second inlet (2.74).

4. The perturbation enhancement assembly of claim 1, wherein, The plurality of blades are uniformly distributed along the circumferential direction of the rotating shaft (2.72); and / or, the plurality of blades are uniformly distributed along the circumferential direction of the rotating shaft (2.72), and the blades adjacent in the axial direction are staggered; and / or, the plurality of blades are uniformly distributed along the circumferential direction of the rotating shaft (2.72), and the blades are inclined along the circumferential direction of the rotating shaft, so that the angle between the width direction of the blades and the transverse section of the first cylinder (2.71) is 30-60°.

5. The perturbation enhancement assembly of any one of claims 1-4, wherein, The outlet of the air inlet pipe is in rotatable communication with one end of the rotating shaft (2.72) through a rotary joint; and / or, a third valve is arranged on the air inlet pipe.

6. The perturbation enhancement assembly of any one of claims 1-4, wherein, The number of air holes (2.731) on the blades of each paddle (2.73) gradually increases from the second inlet to the second outlet.

7. The perturbation enhancement assembly of any one of claims 1-4, wherein, At least one of the inner wall of the first cylinder (2.71), the rotating shaft (2.72) and the paddle (2.73) is made of a heat-conducting material.

8. The perturbation enhancement assembly of claim 7, wherein, The heat-conducting material is one of magnesium alloy, aluminum alloy, steel and copper alloy.

9. The perturbation enhancement assembly of any one of claims 1-4, wherein, The angle between the axial direction of the first cylinder (2.71) and the horizontal plane is 0-90°.

10. The perturbation enhancement assembly of any one of claims 1-4, wherein, The other end of the rotating shaft (2.72) is sealed; and / or, each paddle (2.73) comprises at least two blades.

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