Lithium battery recovery powder reduction equipment

Abstract

The invention relates to the technical field of lithium battery recovery and reduction, in particular to lithium battery recovery powder reduction equipment which comprises a support, a composite kiln unit, a feeding unit and a discharging unit, the feeding unit and the discharging unit are arranged at the two ends of the composite kiln unit respectively, and the composite kiln unit comprises a kiln body, an anti-corrosion layer, a cross heating containing groove and a plurality of flow guide sets. The cross heating placement groove comprises a plurality of groups of cross heating points, the flow guide block does not coincide with the cross heating points, and the cross heating placement groove is matched with the flow guide block in an arrangement mode during operation. The lithium battery recovery powder mixing device has the beneficial effects that the simple substance recovery rate of the lithium battery recovery powder during high-temperature reduction can be increased, the temperature utilization efficiency of equipment can be improved, and the mixing efficiency of the lithium battery recovery powder during high-temperature reduction in the rotary kiln is improved through the arrangement of the flow guide blocks and the cross heating placement grooves in the rotary kiln; and the situation that the lithium battery cannot reach the reduction temperature point due to non-uniform heating is prevented through cooperation of the flow guide block and the cross heating placement groove.

Description

Technical Field

[0001] The invention relates to the technical field of lithium battery recovery and reduction, and in particular to a lithium battery recovery powder reduction device. Background Art

[0002] With the rapid development of science and technology, lithium batteries, as the core components of new energy storage devices, have been widely used in electric vehicles, portable electronic devices and other fields. However, with the surge in the use of lithium batteries, the treatment and recycling of waste lithium batteries have become increasingly prominent. Lithium battery recycling materials are mainly divided into positive electrode materials, negative electrode materials, electrolytes and diaphragms. Positive electrode materials include lithium manganese oxide, lithium cobalt oxide, ternary systems, lithium iron phosphate and other positive electrode materials, and negative electrode materials are usually graphite. Although the electrolyte and diaphragm are contained in small amounts in the battery, they also need special treatment during the recycling process to reduce environmental pollution. The waste of valuable metal resources such as lithium, cobalt and nickel has also attracted widespread attention.

[0003] The recycling methods of lithium battery recycled powder are mainly divided into two categories: pyrometallurgy and hydrometallurgy. Among them, pyrometallurgy promotes redox reaction through high temperature reduction and high temperature pyrolysis, and condenses and recovers low-boiling point metals and compounds. Hydrometallurgy mainly selectively dissolves the electrode materials in scrapped lithium batteries through acid / alkali leaching or deep eutectic dissolution, and separates the metal elements in the leachate.

[0004] In practical applications, pyrometallurgy, especially high-temperature reduction, is widely used because of its simple process, large processing quantity and high efficiency. However, it consumes more energy in the process of high-temperature reduction, which is easy to cause secondary pollution. The most important thing is that it is criticized for its low element recovery rate. There are many reasons for the low element recovery rate. During high-temperature reduction, uneven temperature distribution often occurs, resulting in the inability of lithium battery recycling powder with lower temperature to reach the temperature required by the process. The accumulation of lithium battery recycling powder leads to uneven heating, and the lithium battery recycling powder on the upper layer cannot reach the temperature required by the process. After the overall temperature of the rotary kiln equipment is increased, the "red kiln" phenomenon is prone to occur, resulting in equipment damage.

[0005] Therefore, in order to improve the reduction efficiency of the rotary kiln, maximize the recovery rate of the single substance and ensure that the equipment is not easily damaged, a lithium battery recovery powder reduction equipment is proposed. Summary of the invention

[0006] The purpose of the present invention is to provide a lithium battery recycled powder reduction device, which can improve the single substance recovery rate of lithium battery recycled powder during high-temperature reduction and improve the temperature utilization efficiency of the equipment. Through the arrangement of the guide block and the cross-heating placement groove in the rotary kiln, the mixing efficiency of the lithium battery recycled powder is increased during high-temperature reduction in the rotary kiln, and the cooperation of the guide block and the cross-heating placement groove prevents the lithium battery from being unable to reach the reduction temperature point due to uneven heating.

[0007] In order to solve the above technical problems, the present invention provides the following technical solutions: a lithium battery recovery powder reduction device, which includes a bracket, a composite kiln unit, and a feeding unit and a discharging unit respectively arranged at both ends of the composite kiln unit, the composite kiln unit includes a kiln body, an anti-corrosion layer arranged on the inner wall of the kiln body, a plurality of groups of cross-heating placement grooves arranged inside the anti-corrosion layer, and a plurality of groups of guide blocks arranged on the inner wall of the anti-corrosion layer in an annular distribution;

[0008] Among them, the cross-heating placement slot includes several groups of cross-heating points, and at least one group of cross-heating points is included between two adjacent groups of cross-heating placement slots, and the guide block does not overlap with the cross-heating points.

[0009] It can be known that the lithium battery recycled powder can enter the kiln body through the feeding unit and the reduced lithium battery recycled powder can be transmitted to the next recycling step through the discharging unit. Combined with the usage scenario, the lithium battery recycled powder can be effectively mixed when the kiln body rotates during high-temperature reduction through the guide block, and the heating elements are arranged in the cross-heating placement groove. Through the layout of the guide block and the heating elements in the cross-heating placement groove, the lithium battery recycled powder is blocked by the guide block as much as possible and the lithium battery recycled powder flows to the direction of the heating elements arranged in the cross-heating placement groove to improve the temperature utilization efficiency of the heating elements.

[0010] Preferably, the cross-heating placement slots also include a plurality of groups of first deflection placement slots and a plurality of groups of second deflection placement slots, and the first deflection placement slots and the second deflection placement slots are cross-arranged in a grid shape.

[0011] It can be seen that the first deflection placement slot and the second deflection placement slot realize the cross-arrangement of the cross-heating placement slots, and several groups of cross-heating points are generated through the first deflection placement slot and the second deflection placement slot. The two groups of heating elements will overlap when they are located at the cross-heating points, and a higher temperature will be generated at the cross-heating points compared to other positions, so as to achieve the temperature utilization efficiency of the heating elements.

[0012] Preferably, the cross-heating placement grooves also include a heating gap area formed between two adjacent groups of first deflection placement grooves and two groups of second deflection placement grooves, and a hot spot located at the center of the heating gap area.

[0013] It can be seen that a heating gap zone with a lower temperature than the cross-heating placement slots is formed between the cross-heating placement slots. When the kiln body is heated by the heating element, a heating gap zone will inevitably be generated, and the hot spot has a lower temperature than other positions. However, the arrangement of the cross-heating placement slots effectively increases the average temperature of the heating gap zone to further improve the temperature utilization efficiency.

[0014] Preferably, a generatrix is ​​made parallel to the end face of the kiln body, and the acute angles formed by the first deflection placement groove and the second deflection placement groove and the generatrix are both α, and α is less than 45°.

[0015] In the above scheme, the first deflection placement groove and the second deflection placement groove are set at a certain angle to achieve a cross arrangement. Considering that the cross-heating placement groove maximizes the temperature improvement efficiency and facilitates the layout during implementation, the setting angle α needs to be less than 45° to make the cross-heating placement groove a diamond grid shape.

[0016] Preferably, the guide block includes guide grooves arranged on both sides of the guide block.

[0017] Preferably, when the kiln body rotates, the end of the guide block that first contacts the lithium battery recycled powder is wider than the other end, the wider end of the guide block is higher than the narrower end, and the guide block is streamlined from wide to narrow, and the guide block can mix the lithium battery recycled powder when the kiln body rotates;

[0018] The depth of the guide groove gradually increases from the wider end to the other end of the guide block, and the height thereof gradually decreases.

[0019] It can be seen that when the kiln body rotates, the lithium battery recycled powder will pass through several groups of guide blocks, so that the lithium battery recycled powder will be blocked by the guide blocks and mixed with each other. The wider end of the guide block will contact the lithium battery recycled powder first to achieve sufficient mixing efficiency. The lithium battery recycled powder will slide along the outer wall of the guide block and the guide groove to the narrower side of the guide block. After mixing, the lithium battery recycled powder will prevent the temperature from failing to meet the high-temperature reduction requirements due to the large amount of powder and being unable to contact the inner wall of the kiln body.

[0020] Preferably, the guide block is arranged in the heating gap area and does not overlap with the first deflection placement groove and the second deflection placement groove.

[0021] It can be seen that the guide blocks are all arranged in the heating gap area and do not overlap with the arrangement of the cross-heating placement slots. The guide blocks are located at the positions where the temperature of the inner wall of the kiln body is the lowest and the heat transfer is the lowest. The guide blocks block the lithium battery recycling powder when the kiln body rotates, so that the lithium battery recycling powder slides along the outer wall of the guide block and approaches the positions of the cross-heating placement slots and cross-heating points, thereby achieving the effect of improving the temperature utilization efficiency of the cross-heating placement slots.

[0022] Preferably, the center of gravity of the guide block is arranged on a side close to the feed unit away from the hot spot, and the wider end of the guide block is closer to the feed unit than the other end.

[0023] Preferably, several groups of guide blocks are evenly distributed in several groups of heating gap areas, each group of heating gap areas has one and only one group of guide blocks, and the narrower end of the guide block faces the closest cross heating point.

[0024] It can be seen that when the lithium battery recycled powder is blocked by the guide block and moves relatively along the outer wall of the guide block, part of the lithium battery recycled powder will be deflected to a certain extent toward the discharge unit through the arrangement direction of the guide block, and after moving to the narrower side of the guide block, it will be close to the cross-heating point, and the temperature utilization efficiency of the kiln body will be further improved through the cross-heating point.

[0025] Preferably, several groups of first deflection placement grooves are arranged longitudinally in parallel and evenly inside the anti-corrosion layer, and the distance between each group of first deflection placement grooves is the same; several groups of second deflection placement grooves are arranged longitudinally in parallel and evenly inside the anti-corrosion layer, and the distance between each group of second deflection placement grooves is the same.

[0026] In the above scheme, during implementation, combined with the implementation scenario, the first deflection placement groove and the second deflection placement groove will cross and generate cross heating points. Taking into account the impact on the arrangement of the guide blocks, in order to make the cooperation between the guide blocks and the cross heat prevention grooves better, the distance between each group of first deflection placement grooves and each group of second deflection placement grooves needs to be the same, and a more uniform diamond grid shape is formed by the first deflection placement grooves and the second deflection placement grooves.

[0027] Beneficial effects of the present invention:

[0028] 1. In the prior art, the process of recovering and reducing lithium battery powder by high-temperature reduction method using a rotary kiln has the defects of high energy consumption and low recovery rate of single substance. In order to improve these defects, a cross-heating placement groove and a guide block are set, and the utilization rate of the internal temperature of the rotary kiln is improved through their mutual cooperation, thereby reducing the energy consumption of the overall process. In this process, the lithium battery powder is turned over by the guide block, so that the overall temperature of the lithium battery powder is kept above the process requirement temperature to a greater extent, thereby improving the recovery rate of single substance.

[0029] 2. The advantages of the relevant components of the present invention and their special shape and position relationship are that the guide block is streamlined. When the lithium battery recycled powder rotates in the rotary kiln, the guide block will be turned over, causing a certain degree of mixing of the lithium battery recycled powder. In addition, due to the streamlined guide block, the lithium battery recycled powder will not be blocked by the guide block to the point where it cannot move. When moving along the outer wall of the guide block and when moving to the other side of the guide block, the lithium battery recycled powder will reduce the distance from the cross-heating placement groove, and after moving along the guide groove and the outer wall, part of the lithium battery recycled powder will pass through the cross-heating point, thereby realizing the coordination between the guide block and the heating element in the cross-heating placement groove.

[0030] 3. Under the layout setting of the cross-heating placement grooves arranged in the present invention, compared with the parallel arrangement adopted in the prior art, the heating gap area formed by the cross-heating placement grooves is less affected by the temperature difference, and the temperature difference generated in the heating gap area can be further reduced in the actual application process in conjunction with the guide block. While improving the temperature utilization rate, the cross-heating placement grooves can adopt a method with a lower temperature for each group of heating elements than the conventional arrangement temperature, and achieve the temperature conditions of the high-temperature reduction process of lithium battery recycling powder, thereby reducing the temperature transmitted by the outer surface of the kiln body, and reducing the "red kiln" phenomenon caused by the kiln body being too high in temperature, which leads to damage to the kiln body. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 This is a schematic diagram of the overall structure of the lithium battery recovery powder reduction equipment;

[0032] Figure 2 This is a schematic diagram of the kiln structure of the lithium battery recovery powder reduction equipment;

[0033] Figure 3 This is a schematic diagram of the guide block structure of the lithium battery recovery powder reduction equipment;

[0034] Figure 4 It is a schematic side view of the guide block structure of the lithium battery recovery powder reduction equipment;

[0035] Figure 5 This is a perspective diagram of the kiln body of the lithium battery recycling powder reduction equipment;

[0036] Figure 6 This is a flow analysis diagram of lithium battery recovery powder reduction equipment;

[0037] Figure 7 This is a gas flow analysis diagram of a lithium battery recovery powder reduction device;

[0038] Figure 8 This is a schematic diagram of the cross-heating placement tank layout of the lithium battery recycling powder reduction equipment;

[0039] Fig. 9 This is a schematic diagram of the layout of the cross-heating placement tanks after the kiln body of the lithium battery recovery powder reduction equipment is unfolded.

[0040] In the figure: 100, support; 200, composite kiln unit; 300, feeding unit; 400, discharging unit; 201, kiln body; 202, anti-corrosion layer; 203, cross-heating placement groove; 204, guide block; 203a, cross-heating point; 203b, first deflection placement groove; 203c, second deflection placement groove; 203d, heating gap area; 203e, hot spot; 204a, guide groove. DETAILED DESCRIPTION

[0041] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0042] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein. Those skilled in the art may obtain other implementation methods without violating the connotation of the present invention and without paying creative labor. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0043] See also Figures 1 to 9 The present invention provides a lithium battery recovery powder reduction device, and the technical solution is as follows:

[0044] The lithium battery recovery powder reduction equipment designed by the present invention comprises a support 100, a composite kiln unit 200, and a feeding unit 300 and a discharging unit 400 respectively arranged at both ends of the composite kiln unit 200. The composite kiln unit 200 comprises a kiln body 201, an anti-corrosion layer 202 arranged on the inner wall of the kiln body 201, a plurality of groups of cross-heating placement grooves 203 arranged inside the anti-corrosion layer 202, and a plurality of groups of guide blocks 204 arranged on the inner wall of the anti-corrosion layer 202 in an annular distribution. The placement slots 203 include several groups of cross-heating points 203a, and at least one group of cross-heating points 203a is included between two adjacent groups of cross-heating placement slots 203. The cross-heating placement slots 203 also include a heating gap area 203d formed between two adjacent groups of first deflection placement slots 203b and two groups of second deflection placement slots 203c, and a hotspot 203e located at the center of the heating gap area 203d. The guide block 204 includes guide slots 204a arranged on both sides of the guide block 204.

[0045] As an embodiment of the present invention, refer to Figures 5 to 9 The first deflection placement slot 203b and the second deflection placement slot 203c are cross-arranged in a grid shape, and a plurality of groups of cross-heating points 203a are generated through the first deflection placement slot 203b and the second deflection placement slot 203c. The two groups of heating elements will overlap when located at the cross-heating points 203a, and a higher temperature will be generated at the cross-heating points 203a than at other positions, so as to achieve the temperature utilization efficiency of the heating elements. Different layout methods can be adopted in implementation, but they must all be in a uniform diamond grid shape.

[0046] As an embodiment of the present invention, refer to Figure 5 , Figure 7 or Fig. 9A heating gap zone 203d with a lower temperature than the position of the cross-heating placement slots 203 is formed between the cross-heating placement slots 203. When the kiln body 201 is heated by the heating element, the heating gap zone 203d will inevitably be generated, and the temperature of the hot spot 203e is lower than that of other positions. However, the arrangement of the cross-heating placement slots 203 effectively increases the average temperature of the heating gap zone 203d to further improve the temperature utilization efficiency. In this embodiment, the space formed by the heating gap zone 203d is a parallelogram except for the end portions, and the hot spot 203e is at the same shortest distance from the four sides of the heating gap zone 203d, and is the farthest position from the cross-heating point 203a in the heating gap zone 203d. When the kiln body 201 is in operation, the heat transfer efficiency generated by the hot spot 203e is also low.

[0047] As an embodiment of the present invention, refer to Figure 8 , as a busbar parallel to the end face of the kiln body 201, the acute angles formed by the first deflection placement groove 203b and the second deflection placement groove 203c with the busbar are both α, and α is less than 45°. The first deflection placement groove 203b and the second deflection placement groove 203c are arranged at a certain angle to achieve a cross arrangement. Considering the maximization of the temperature improvement efficiency of the cross-heating placement groove 203 and the convenience of arrangement during implementation, as well as the coordination with the guide block 204, the α angle needs to be less than 45°, and the setting angle α is preferably about 10° to about 30°, so that the guide block 204 does not overlap with the cross-heating placement groove 203, thereby preventing the guide block 204 from affecting the heat transfer between the cross-heating placement groove 203 and the inside of the kiln body 201.

[0048] As an embodiment of the present invention, refer to Figures 1 to 5When the kiln body 201 rotates, the end of the guide block 204 that first contacts the lithium battery recycling powder is wider than the other end, and the wider end of the guide block 204 is higher than the narrower end. The guide block 204 is streamlined from wide to narrow, and the guide block 204 can mix the lithium battery recycling powder when the kiln body 201 rotates; the depth of the guide groove 204a gradually increases from the wider end of the guide block 204 to the other end, and its height gradually decreases. When the kiln body 201 rotates, the lithium battery recycling powder will pass through several groups of guide blocks 204, so that the lithium battery recycling powder is blocked by the guide block 204 under the action of the guide block 204 and mixes with each other. The wider end of the guide block 204 will first contact the lithium battery recycling powder to achieve sufficient mixing efficiency. The lithium battery recycling powder will slide along the outer wall of the guide block 204 and the guide groove 204a to the narrower side of the guide block 204. The lithium battery recycling powder will be prevented from mixing due to powder quality after mixing. In the case where the temperature cannot reach the high-temperature reduction requirement due to the large number of inconveniences caused by the kiln body 201, the total amount of lithium battery recycled powder reduced at one time at high temperature is controlled to avoid uneven heating inside the kiln body 201, which causes the lithium battery recycled powder to fail to reach the required process temperature. In this embodiment, high-temperature reduction is assisted by reducing gas, and it takes a period of time for the gas to mix inside the kiln body 201 during the process of releasing gas. The guide groove 204a has a shallower groove body and a higher height at one end and a deeper groove body and a lower height at the other end. When the rotary kiln rotates, a certain amount of auxiliary mixing is generated for the gas, which makes it easier for the lithium battery recycled powder to react with the reducing gas. In this embodiment, the guide groove 204a is an arc surface with a depth from deep to shallow from the upper part to the lower part. When mixing the lithium battery recycled powder, the mixing efficiency can be effectively increased while preventing the lithium battery recycled powder from staying inside the guide groove 204a.

[0049] As an embodiment of the present invention, refer to Figure 5 The guide block 204 is arranged in the heating gap area 203d and does not overlap with the first deflection placement groove 203b and the second deflection placement groove 203c. The guide block 204 is arranged in the heating gap area 203d and does not overlap with the arrangement of the cross-heating placement groove. The position of the guide block 204 is the lowest temperature of the inner wall of the kiln body 201 and the lowest heat transfer position. The guide block 204 blocks the lithium battery recycling powder when the kiln body 201 rotates, so that the lithium battery recycling powder slides along the outer wall of the guide block 204 and approaches the position of the cross-heating placement groove 203 and the cross-heating point 203a, thereby achieving the effect of improving the temperature utilization efficiency of the cross-heating placement groove 203.

[0050] As an embodiment of the present invention, refer to Figure 6 or Figure 7The center of gravity of the guide block 204 is set at the side close to the feeding unit 300 away from the hot spot 203e, and the wider end of the guide block 204 is closer to the feeding unit 300 than the other end. Several groups of guide blocks 204 are evenly distributed in several groups of heating gap areas 203d. Each group of heating gap areas 203d has and only has one group of guide blocks 204, and the narrower end of the guide block 204 faces the closest cross heating point 203a. When the lithium battery recycled powder is blocked by the guide block 204 and moves relatively along the outer wall of the guide block 204, part of the lithium battery recycled powder will be deflected to a certain extent toward the direction of the discharging unit 400 through the arrangement direction of the guide block 204, and will be close to the cross heating point 203a after moving to the narrower side of the guide block 204. 3a, and further improve the temperature utilization efficiency of the kiln body 201 through the cross-heating point 203a. In this embodiment, the guide block 204 will generate a certain air pressure difference when mixing the lithium battery recycled powder. The guide groove 204a and the lithium battery recycled powder will slide along the cross-heating placement groove 203 to a greater extent, and make a larger part of the lithium battery recycled powder slide toward the cross-heating point 203a, so as to further improve the temperature utilization efficiency. After being turned over by the guide block 204, the lithium battery recycled powder will be partially guided to the cross-heating point 203a. The lithium battery recycled powder will generate more efficient heat transfer when it contacts the cross-heating point 203a, so as to ensure that the temperature of the lithium battery recycled powder inside the kiln body is maintained above the reduction process temperature.

[0051] As an embodiment of the present invention, refer to Fig. 9 , a plurality of groups of first deflection placement grooves 203b are parallelly and evenly arranged longitudinally inside the anti-corrosion layer 202, and the distance between each group of first deflection placement grooves 203b is the same, and a plurality of groups of second deflection placement grooves 203c are parallelly and evenly arranged longitudinally inside the anti-corrosion layer 202, and the distance between each group of second deflection placement grooves 203c is the same. During implementation, combined with the implementation scenario, the first deflection placement grooves 203b and the second deflection placement grooves 203c will cross and generate cross-heating points 203a. Considering the influence of the arrangement of the guide block 204, in order to make the guide block 204 and the cross-heating prevention groove 203a intersect, the first deflection placement grooves 203b and the second deflection placement grooves 203c intersect and generate cross-heating points 203a. 03 has a better coordination effect, and the distance between each group of first deflection placement grooves 203b and each group of second deflection placement grooves 203c must be the same. A more uniform diamond grid is formed by the first deflection placement grooves 203b and the second deflection placement grooves 203c, so that the guide block 204 will not affect the temperature utilization efficiency of the heating element, and at the same time, the lithium battery recycling powder in each section with the same temperature can be heated more evenly. Moreover, since the arrangement of the guide block 204 is affected by the cross-heating placement grooves 203, it is necessary to ensure that the flow speed of the lithium battery recycling powder is uniform during the operation of the kiln body 201, which can help to improve the recovery rate of the single substance.

[0052] Workflow: lithium battery recycled powder is placed in the feeding unit 300, and the lithium battery recycled powder can enter the kiln body 201 through the feeding unit 300, and the reduced lithium battery recycled powder is transmitted to the next recycling step through the discharging unit 400. Combined with the usage scenario, the kiln body 201 can effectively mix the lithium battery recycled powder when rotating for high-temperature reduction through the guide block 204, and a heating element is arranged in the cross-heating placement groove 203. Through the layout of the guide block 204 and the heating elements in the cross-heating placement groove 203, the lithium battery recycled powder is blocked by the guide block 204 as much as possible and the lithium battery recycled powder flows to the direction of the heating elements arranged in the cross-heating placement groove 203 to improve the temperature utilization efficiency of the heating elements, and the heating elements arranged in the cross-heating placement groove 203 can adjust the temperature of different sections by controlling, so as to better place the lithium battery recycled powder in the optimal reduction temperature environment.

[0053] Specifically, the recycled lithium battery powder is placed in the feeding unit 300, and the recycled lithium battery powder can enter the kiln body 201 through the feeding unit 300. The kiln body 201 is controlled and heated in sections by the heating element located in the cross-heating placement groove 203, and the kiln body 201 is rotated to start the high-temperature reduction process.

[0054] By releasing reducing gas into the kiln body 201 to assist high-temperature reduction, and controlling the atmosphere inside the kiln body 201 in real time to meet the reduction process, at this time, the guide groove 204a has a shallower groove body and a higher height at one end, and a deeper groove body and a lower height at the other end. While the rotary kiln rotates, a certain amount of auxiliary mixing of the gas is produced, which is more convenient for the lithium battery recovery powder to react with the reducing gas. When the kiln body 201 rotates, the lithium battery recovery powder will pass through a number of groups of guide blocks 204, so that the lithium battery recovery powder is blocked by the guide blocks 204 under the action of the guide blocks 204 and mixes with each other. The wider end of the guide block 204 will contact the lithium battery recovery powder first. The lithium battery recovery powder will be staggered and continuously turned over by the several groups of guide blocks 204. The lithium battery recovery powder will slide along the outer wall of the guide block 204 and the guide groove 204a to the narrower side of the guide block 204. In order to achieve sufficient mixing efficiency, the lithium battery recycled powder after mixing is prevented from being unable to contact the inner wall of the kiln body 201 due to the large amount of powder, resulting in a situation where the temperature cannot meet the high-temperature reduction requirements. The guide groove 204a is an arc surface with a depth from deep to shallow along the upper part to the lower part. When mixing the lithium battery recycled powder, the mixing efficiency can be effectively increased while preventing the lithium battery recycled powder from staying inside the guide groove 204a. When the lithium battery recycled powder is turned over and mixed by the guide block 204, it will be blocked by the guide block 204. Along the streamlined outer wall of the guide block 204, more lithium battery recycled powder is allowed to flow to the direction of arranging the heating elements in the cross-heating placement groove 203 to improve the temperature utilization efficiency of the heating elements, and more lithium battery recycled powder is allowed to move to the narrower side of the guide block 204 and approach the cross-heating point 203a, and the temperature utilization efficiency of the kiln body 201 is further improved through the cross-heating point 203a.

[0055] And through the certain inclination angle of the kiln body 201 itself, the lithium battery recycled powder will gradually move from the feeding unit 300 to the discharging unit 400 during the high-temperature reduction process and enter the cooling step of the recycling process.

[0056] The above implementation modes are only used to illustrate some examples of the technical solutions of the present invention that can be implemented rather than to limit the implementation modes. The present invention can be understood in more detail with reference to the embodiments. Those skilled in the art should understand that the technical solutions of the present invention can be modified or replaced by equivalents without departing from the scope of the technical solutions of the present invention, which should be included in the scope of the claims of the present invention.

Claims

1. A lithium battery recycling powder reduction device, characterized in that: include, A support (100), a composite kiln unit (200), and a material feeding unit (300) and a material discharging unit (400) respectively arranged at two ends of the composite kiln unit (200); The composite kiln unit (200) comprises a kiln body (201), an anti-corrosion layer (202) arranged on the inner wall of the kiln body (201), a plurality of groups of cross-heating placement grooves (203) arranged inside the anti-corrosion layer (202), and a plurality of groups of guide blocks (204) arranged on the inner wall of the anti-corrosion layer (202) and distributed in an annular shape; The cross-heating placement slot (203) includes a plurality of groups of cross-heating points (203a), and at least one group of cross-heating points (203a) is included between two adjacent groups of the cross-heating placement slots (203), and the guide block (204) does not overlap with the cross-heating points (203a).

2. The lithium battery recovery powder reduction device according to claim 1, characterized in that: The cross-heating placement slots (203) further include a plurality of groups of first deflection placement slots (203b) and a plurality of groups of second deflection placement slots (203c); The first deflection placement groove (203b) and the second deflection placement groove (203c) are arranged crosswise in a grid shape.

3. The lithium battery recovery powder restoration equipment according to claim 2, characterized in that: The cross-heating placement groove (203) also includes a heating gap area (203d) formed between two adjacent groups of the first deflection placement grooves (203b) and two groups of the second deflection placement grooves (203c), and a hot spot (203e) located at the center of the heating gap area (203d).

4. The lithium battery recovery powder restoration equipment according to claim 3, characterized in that: A generatrix is ​​formed parallel to the end face of the kiln body (201), and the acute angles formed by the first deflection placement groove (203b) and the second deflection placement groove (203c) with the generatrix are both α, and α is less than 45°.

5. The lithium battery recovery powder reduction device according to claim 3 or 4, characterized in that: The guide block (204) comprises guide grooves (204a) arranged on both sides of the guide block (204).

6. The lithium battery recovery powder restoration equipment according to claim 5, characterized in that: When the kiln body (201) rotates, the end of the guide block (204) that first contacts the lithium battery recycled powder is wider than the other end, the wider end of the guide block (204) is higher than the narrower end, and the guide block (204) is streamlined from wide to narrow. The guide block (204) can mix the lithium battery recycled powder when the kiln body (201) rotates; The depth of the guide groove (204a) gradually increases from the wider end to the other end of the guide block (204), and the height gradually decreases.

7. The lithium battery recovery powder restoration equipment according to claim 6, characterized in that: The guide block (204) is arranged in the heating gap area (203d) and does not overlap with the first deflection placement groove (203b) and the second deflection placement groove (203c).

8. The lithium battery recovery powder restoration device according to any one of claim 7, characterized in that: The center of gravity of the guide block (204) is arranged on a side of the hot spot (203e) close to the feed unit (300), and the wider end of the guide block (204) is closer to the feed unit (300) than the other end.

9. The lithium battery recovery powder restoration equipment according to any one of claims 6 to 8, characterized in that: A plurality of groups of guide blocks (204) are evenly distributed in a plurality of groups of heating gap zones (203d), each group of heating gap zones (203d) has one and only one group of guide blocks (204), and the narrower end of the guide block (204) faces the closest cross-heating point (203a).

10. The lithium battery recovery powder restoration equipment according to claim 9, characterized in that: A plurality of groups of the first deflection placement grooves (203b) are arranged longitudinally in parallel and uniformly inside the anti-corrosion layer (202), and the distance between each group of the first deflection placement grooves (203b) is the same; a plurality of groups of the second deflection placement grooves (203c) are arranged longitudinally in parallel and uniformly inside the anti-corrosion layer (202), and the distance between each group of the second deflection placement grooves (203c) is the same.

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