Double-channel mixing device and battery black powder roasting reduction system

Abstract

The utility model relates to material mixing technical field, aims at solving the problem that the existing material mixing equipment is difficult to take into account material mixing fullness and low equipment cost. For this purpose, the utility model provides a kind of double pass material mixing device and battery black powder roasting reduction system, the double pass material mixing device includes first conveying pipeline, second conveying pipeline and mixing pipeline, first conveying pipeline and second conveying pipeline are connected in parallel and are all communicated with mixing pipeline;At least one mixing baffle group is provided in mixing pipeline, and the mixing baffle group includes multiple mixing baffles sequentially and intervally arranged along the material conveying direction, and the multiple mixing baffles are arranged to improve the mixing effect of the conveyed material in the mixing pipeline. The utility model is arranged by double pass parallel connection and multiple mixing baffles in mixing pipeline, so that the material can be mixed in multiple stages and fully in the conveying process, improve the uniformity of material mixing, and the structure is simple, easy to manufacture, and reduce equipment cost.

Description

Technical Field

[0001] This utility model relates to the field of material mixing technology, specifically to a dual-channel mixing device and a battery black powder roasting and reduction system. Background Technology

[0002] Material mixing equipment is a machine that can mix multiple materials. It has a wide range of applications, such as chemical and petrochemical industries, metallurgical and mineral processing industries, plastics and rubber industries, building materials industries, and even food and beverage and manufacturing industries. However, traditional material mixing equipment often has poor mixing effect. If it is necessary to improve the mixing effect, it is generally necessary to add independent mixers, which has the problems of large number of equipment, large footprint and high investment cost.

[0003] For example, in the calcination and reduction process of battery black powder, it is often necessary to recycle reusable metals. Taking lithium batteries as an example, before calcination, black powder and reducing agent (such as carbon powder) need to be mixed. If the mixing is insufficient, it will lead to problems such as incomplete reduction reaction, uneven temperature distribution in the furnace, and decline in the quality of the final product. If independent mixers and other structures are added to the production line, the overall production line will be very cumbersome, which is not conducive to the layout of the production line. Moreover, the large number of equipment will also increase the construction cost of the production line.

[0004] Therefore, there is a need in the art for a dual-channel mixing device and a battery black powder calcination reduction system having the dual-channel mixing device to solve the above problems. Utility Model Content

[0005] (a) Purpose of the utility model The purpose of this invention is to provide a dual-channel mixing device and a battery black powder roasting and reduction system, which aims to solve the problem that existing material mixing equipment is difficult to balance sufficient material mixing and low equipment cost.

[0006] (II) Technical Solution To address the aforementioned problems, the present invention provides a dual-channel mixing device, comprising a first conveying pipe, a second conveying pipe, and a mixing pipe, wherein the first conveying pipe and the second conveying pipe are connected in parallel and both are connected to the mixing pipe; at least one mixing baffle assembly is provided within the mixing pipe, the mixing baffle assembly comprising a plurality of mixing baffles arranged at intervals along the material conveying direction, the plurality of mixing baffles being configured to improve the mixing effect of the material being conveyed within the mixing pipe.

[0007] By configuring the two conveying pipes in parallel and arranging multiple mixing baffles within the mixing pipe, the material can be mixed in multiple stages and thoroughly during the conveying process, improving the uniformity of the material mixture. This eliminates the need for an additional independent mixer; a simple modification to the mixing pipe is sufficient to achieve a high mixing effect. The structure is simple, easy to manufacture, reduces the number of devices required, lowers equipment costs, and reduces floor space, facilitating overall equipment layout. Furthermore, it can be adapted to various fields and scenarios, increasing the breadth and versatility of its applications.

[0008] In some embodiments, the mixing conduit is arranged vertically or inclined relative to the horizontal plane, and each of the mixing baffles is inclined relative to the inner wall of the mixing conduit.

[0009] By setting the mixing pipe perpendicular to the horizontal plane, the horizontal space occupied by the mixing pipe can be minimized to the greatest extent. This arrangement is beneficial for scenarios with limited floor space. Setting the mixing pipe inclined relative to the horizontal plane can appropriately reduce the vertical space occupied by the mixing pipe, while also reducing some horizontal space. This arrangement is beneficial for scenarios with limited vertical space. Setting each mixing baffle inclined relative to the inner wall of the mixing pipe allows the mixing baffle to decompose the impact force of material particles into components along the conveying direction and the radial direction of the mixing pipe. The component along the conveying direction propels the material forward, while the component along the radial direction of the mixing pipe causes the material to change its direction of movement, thus achieving mixing between materials, improving mixing efficiency while avoiding blockage.

[0010] In some embodiments, there are multiple mixing baffle groups, and the mixing baffles in each mixing baffle group are staggered with the mixing baffles in other mixing baffle groups along the axial direction of the mixing pipe.

[0011] By setting up multiple mixing baffles in an alternating pattern, the material can continuously change its flow direction during transportation in the mixing pipeline, forcing the material particles to collide repeatedly, further promoting dynamic mixing of the material during the transportation process, improving the mixing uniformity of the material, and greatly enhancing the mixing efficiency of the material.

[0012] In some embodiments, the mixing pipe has a circular cross-section, and a plurality of the mixing baffle assemblies are evenly arranged along the circumference of the mixing pipe cross-section.

[0013] With this design, the circular cross-section mixing pipe facilitates the uniform circumferential arrangement of multiple mixing baffle groups, reducing its manufacturing difficulty. Furthermore, the circular cross-section pipe has no structural dead corners in its circumference, preventing material from accumulating locally in dead corners and making cleaning and maintenance inconvenient.

[0014] In some embodiments, the number of mixing baffle groups is two, three, or four; when the number of mixing baffle groups is two, the two mixing baffle groups are respectively arranged on the inner wall of the mixing pipe at a 180° interval; when the number of mixing baffle groups is three, the three mixing baffle groups are respectively arranged on the inner wall of the mixing pipe at a 120° interval; when the number of mixing baffle groups is four, the four mixing baffle groups are respectively arranged on the inner wall of the mixing pipe at a 90° interval.

[0015] This setup increases the flexibility and freedom of choice in arranging the mixing baffles. Technicians can arrange them flexibly according to the actual application scenario. For example, they can choose a suitable arrangement based on the diameter of the mixing pipe, the particle size of the material, and the uniformity of the material mixing, taking into account both the manufacturing cost of the device and the mixing effect of the material. For instance, when the above four mixing baffles are evenly distributed at 90° intervals, the mixing effect of the material can be greatly improved. When it is necessary to consider the manufacturing cost of the device, the number of mixing baffles can be reduced to three or two.

[0016] In some embodiments, all or part of the mixing baffle is provided with a discharge hole at one end near the inner wall of the mixing pipe, the discharge hole being configured to allow material to fall back when the conveying stops.

[0017] With this design, a discharge hole is provided at one end of the mixing baffle near the inner wall of the mixing pipe. When the device stops running, the discharge hole allows residual material accumulated at the base of the mixing baffle to fall back through the discharge hole, reducing material waste, preventing material stagnation and hardening in the complex pipe structure, achieving the self-cleaning function of the pipe, preventing pipe blockage, reducing maintenance and cleaning workload, and ensuring smooth start-up of the device. More importantly, the discharge hole is directly set on the mixing baffle, so that the mixing baffle with the discharge hole not only improves the material mixing effect but also has the function of material fallback. That is, a simple baffle structure can achieve dual functions, avoiding the introduction of other complex structures and making full use of the space inside the mixing pipe.

[0018] In some embodiments, the discharge hole is a circular hole with a diameter of 0.05-3 mm.

[0019] This design allows the discharge hole to accommodate a wide range of material particle sizes. The round hole facilitates material passage, and technicians can flexibly select the appropriate diameter of the round hole as the discharge hole based on the specific material type and specifications. For example, a small-diameter discharge hole is suitable for fine powder materials, while a large-diameter discharge hole is suitable for coarser particles. This ensures that the material falls back without affecting the conveying and mixing of materials during normal transport.

[0020] In some embodiments, the dual-channel mixing device further includes an airflow conveying mechanism; when the airflow of the airflow conveying mechanism is a thrust airflow, the airflow conveying mechanism is connected to the inlet of the first conveying pipe and the inlet of the second conveying pipe respectively; when the airflow of the airflow conveying mechanism is a suction airflow, the airflow conveying mechanism is connected to the outlet of the mixing pipe; when the airflow conveying mechanism includes a thrust airflow assembly and a suction airflow assembly, the thrust airflow assembly is connected to the inlet of the first conveying pipe and the inlet of the second conveying pipe respectively, and the suction airflow assembly is connected to the outlet of the mixing pipe.

[0021] With this setup, pneumatic conveying allows materials from the first and second conveying pipes to enter the mixing pipe more quickly, conveniently, and naturally. This avoids the need for complex structures to facilitate the mixing of materials from the two pipes. Furthermore, pneumatic conveying maximizes the use of the pipe's cross-section during transport, ensuring full coverage without causing blockages. The impact of the airflow with the mixing baffles allows the airflow to penetrate deeper into the material particles, driving continuous collisions and further improving the mixing effect. Pneumatic conveying also minimizes the introduction of external contaminants, ensuring the cleanliness and purity of the transported materials.

[0022] Furthermore, technicians can select appropriate airflow conveying methods based on different usage scenarios, improving the flexibility of selection. For example, thrust airflow is suitable for high-density materials or scenarios with long conveying distances, achieving material conveying or long-distance material conveying through greater airflow thrust; suction airflow is suitable for lightweight materials, and suction airflow can effectively avoid dust generation during the conveying process of lightweight materials; combining thrust and suction airflow can not only cope with the resistance loss of long-distance conveying, but also maintain a stable material picking environment. By balancing and adjusting thrust and suction, the flow rate of materials in the mixing pipe can also be precisely controlled, so that the mixing process is carried out within the optimal parameter range, improving the material mixing effect.

[0023] In some embodiments, the dual-channel mixing device further includes a mixing hopper connected to the outlet of the mixing pipe.

[0024] With this setup, the mixing silo is connected to the mixing pipeline outlet, realizing an integrated system for material conveying, mixing, and temporary storage. This reduces intermediate equipment, improves the overall compactness of the unit layout, and enables continuous material feeding operations, thereby increasing the feeding efficiency after material mixing.

[0025] The second aspect of this utility model provides a battery black powder calcination and reduction system, including a screw feeder, a rotary kiln, a post-processing device, and the aforementioned dual-channel mixing device; the first conveying pipe is used to convey black powder, the second conveying pipe is used to convey reducing agent, the mixing silo, the screw feeder, and the rotary kiln are connected in sequence, the screw feeder is provided with an exhaust gas discharge pipe, and the exhaust gas discharge pipe is connected to the post-processing device.

[0026] By applying a dual-channel mixing device to the battery black powder roasting and reduction system, the dual-channel mixing device can transport and mix the black powder and reducing agent, improving the mixing effect of the black powder and reducing agent. This ensures that the black powder and reducing agent are fully mixed and in contact before entering the screw feeder, guaranteeing that they can be fully roasted in the subsequent rotary kiln equipment, making the reduction reaction more thorough, avoiding uneven temperature distribution in the furnace, improving the purity of the recovered metal, enhancing the quality of the final product, and eliminating the need for a separate mixer, simplifying the overall production line structure, facilitating production line layout, and reducing the construction cost of the production line. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the overall structure of the dual-channel mixing device provided by this utility model; Figure 2 This is a schematic diagram of the internal structure of the hybrid conveying pipeline provided by this utility model.

[0028] Figure label: 1. First conveying pipeline; 2. Second conveying pipeline; 3. Mixed piping; 4. Mixing baffle assembly; 41. Mixing baffle; 41a. Discharge hole; 5. Airflow conveying mechanism; 6. Mixing silo. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings. It should be understood that these descriptions are merely exemplary and not intended to limit the scope of this utility model. Furthermore, descriptions of well-known structures and technologies are omitted in the following description to avoid unnecessarily obscuring the concept of this utility model.

[0030] The accompanying drawings show schematic diagrams of layer structures according to embodiments of the present invention. These drawings are not to scale, and some details have been enlarged for clarity, and some details may have been omitted. The shapes of the various regions and layers shown in the drawings, as well as their relative sizes and positional relationships, are merely exemplary and may deviate from reality due to manufacturing tolerances or technical limitations. Furthermore, those skilled in the art can design regions / layers with different shapes, sizes, and relative positions as needed.

[0031] Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without inventive effort are within the scope of protection of this utility model.

[0032] In the description of this utility model, it should be noted that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0033] Based on the problem pointed out in the background art that existing material mixing equipment is difficult to balance sufficient material mixing and low equipment cost, this utility model provides a dual-channel mixing device, which aims to enable multi-stage and sufficient mixing of materials during the conveying process, improve the uniformity of material mixing, and has a simple structure, is easy to manufacture, and reduces equipment cost.

[0034] It should be noted that the dual-channel mixing device of this utility model is not limited to specific application scenarios. For example, it can be used for mixing raw materials of powder coatings, dyes and pigments, and fine chemicals in the chemical industry; it can be used for mixing metallurgical sintering materials and powder metallurgy raw materials in the metallurgical and mining industry; it can be used for mixing formula milk powder, nutritional powder, seasonings, and additives in the food industry; it can be used for mixing drug raw materials in the pharmaceutical industry; or it can be used for mixing black powder and reducing agent before roasting and reduction of battery black powder in the new energy material recycling industry.

[0035] It should also be noted that the dual-channel mixing device of this utility model can mix different kinds of materials or mix the same kind of materials. For example, it can mix the same kind of materials with the same chemical properties but different physical properties (such as different particle sizes). As long as the technical solution is applicable to the dual-channel mixing device provided by this utility model to improve the mixing effect of materials, it is within the protection scope of this utility model.

[0036] See Figure 1 and Figure 2The dual-channel mixing device of this utility model includes a first conveying pipe 1, a second conveying pipe 2, and a mixing pipe 3. The first conveying pipe 1 and the second conveying pipe 2 are arranged in parallel and are both connected to the mixing pipe 3. At least one mixing baffle group 4 is provided in the mixing pipe 3. The mixing baffle group 4 includes a plurality of mixing baffles 41 arranged at intervals along the material conveying direction. The plurality of mixing baffles 41 are configured to improve the mixing effect of the material conveyed in the mixing pipe 3.

[0037] The first conveying pipe 1 and the second conveying pipe 2 are arranged in parallel and are used to convey their respective materials. The mixing pipe 3 provides a mixing area. One or more mixing baffle groups 4 are set inside the pipe, which cause the material to collide and split multiple times during the material conveying process, thereby improving the mixing effect of the material. The mixing baffle group 4 is composed of multiple mixing baffles 41 arranged at intervals along the material conveying direction. Through the action of multiple mixing baffles 41, the conveying direction and conveying speed of the material are constantly changed during the conveying process. The blocking effect of the mixing baffles 41 creates a complex material flow field in the mixing pipe. The materials permeate and diffuse with each other in this flow field, thereby achieving uniform mixing of the materials.

[0038] It should be noted that the specific arrangement of the mixing pipe 3 is not limited here. Depending on the requirements of the device and the application scenario, it can be set horizontally, vertically, or inclined, as long as it can achieve material transfer and thorough mixing within the mixing pipe 3. In some preferred embodiments, the mixing pipe 3 is set vertically or inclined relative to the horizontal plane, thereby reducing the space occupied by the mixing pipe 3 in the horizontal direction.

[0039] Preferably, each mixing baffle 41 is inclined relative to the inner wall of the mixing pipe 3. The inclined mixing baffle 41 can decompose the impact force of the material particles into components along the conveying direction and the radial direction of the mixing pipe 3. The component along the conveying direction propels the material forward, while the component along the radial direction causes the material to change its direction of movement, thereby achieving mixing between materials, improving mixing efficiency while avoiding blockage. More preferably, the angle between the mixing baffle 41 and the inner wall of the mixing pipe 3 is 30° to 75°. Through the inventor's research and experimental verification, the 30° to 75° angle setting balances the mixing effect and flow resistance, ensuring that the material is fully mixed while being conveyed forward.

[0040] In some possible implementations, there are multiple mixing baffle groups 4, with the mixing baffles 41 in each mixing baffle group 4 staggered with those in other mixing baffle groups 4 along the axial direction of the mixing pipe 3. That is, multiple mixing baffle groups 4 are staggered along the axial direction of the mixing pipe 3, and each mixing baffle group 4 contains multiple mixing baffles 41 in a specific arrangement. The mixing baffles 41 in different groups are staggered in the axial direction, so that after the material passes through the previous group of mixing baffles 41, it immediately enters the next group of mixing areas with different spatial characteristics. When the material flows through these staggered mixing baffle groups 4, the flow direction changes continuously, and the flow velocity distribution is repeatedly reorganized, forming a dynamic and complex flow field environment, which further improves the mixing effect of the material.

[0041] It should be noted that the specific shape of the cross-section of the mixing pipe 3 is not limited here; it can be rectangular, polygonal, or circular, as long as it can meet the requirements of material mixing and conveying. In some preferred embodiments, the cross-section of the mixing pipe 3 is circular, and multiple mixing baffle groups 4 are evenly arranged around the circumference of the cross-section of the mixing pipe 3. The circular cross-section design of the mixing pipe 3 can provide uniform flow resistance while reducing wall friction. The multiple mixing baffle groups 4 are evenly arranged around the circumference of the pipe cross-section to ensure that the material is subjected to the same mixing effect at all radial positions of the mixing pipe 3. When the material flows through the circumferentially evenly arranged mixing baffle groups 4, the mixing pipe 3 and the circumferentially evenly arranged mixing baffle groups 4 make the material evenly distributed in the pipe. At the same time, the circular cross-section does not have sharp corners, avoiding the problem of material accumulation in the pipe due to structural dead corners, and ensuring the effective utilization of the entire flow cross-section.

[0042] In the above, those skilled in the art can flexibly set the specific number of mixing baffle groups 4 in practical applications, such as two, three, four or even more. In one possible case, the number of mixing baffle groups 4 is two, and the two mixing baffle groups 4 are respectively arranged on the inner wall of the mixing pipe 3 at a 180° interval. In another possible case, the number of mixing baffle groups 4 is three, and the three mixing baffle groups 4 are respectively arranged on the inner wall of the mixing pipe 3 at a 120° interval. In yet another possible case, the number of mixing baffle groups 4 is four, and the four mixing baffle groups 4 are respectively arranged on the inner wall of the mixing pipe 3 at a 90° interval. The number of mixing baffle groups 4 can be two, three, or four, corresponding to different arrangement angles of 180°, 120°, or 90°. When the mixing difficulty of the material is low or the mixing requirements are low, two mixing baffle groups 4 can be set up, with the two mixing baffle groups 4 arranged opposite each other at a 180° interval, forming a symmetrical impact flow field. The material repeatedly collides with each other between the two mixing baffle groups 4, simplifying the internal structure of the mixing pipe 3 and saving the production cost of the mixing pipe 3. When three mixing baffle groups 4 are set up, with the three mixing baffle groups 4 arranged at a 120° interval, the mixing effect and the complexity of the internal structure of the mixing pipe 3 can be balanced, which is suitable for most conventional mixing tasks. The material undergoes collision switching in three directions in the pipe to achieve material mixing. When dealing with high-difficulty mixing tasks, such as the processing of trace components or extremely high viscosity materials, four mixing baffle groups 4 are arranged at a 90° interval to form a complex flow environment. The material is constantly exchanged between the mixing baffle groups 4 in four directions to ensure a high mixing effect of the material.

[0043] In some possible implementations, all or part of the mixing baffle 41 is provided with a discharge hole 41a at one end near the inner wall of the mixing pipe 3. The discharge hole 41a is designed to allow the material to fall back when the conveying stops. The discharge hole 41a is located at one end of the mixing baffle 41 near the inner wall of the mixing pipe 3. When the device is running normally, the material passes through the mixing pipe 3, and the discharge hole 41a does not affect the material flow in the mixing pipe 3. The mixing process mainly relies on the guiding and collision effects of the mixing baffle 41. When the device stops, the material falls back under the action of gravity. At this time, the discharge hole 41a provides a channel for the material to fall back, avoiding the accumulation of material on the surface of the mixing baffle 41 or in the area inside the mixing pipe 3, maintaining a clean environment inside the mixing pipe 3, ensuring smooth subsequent material conveying in the mixing pipe 3, and preventing material accumulation and agglomeration that could damage the structure of the mixing pipe 3.

[0044] More preferably, the discharge hole 41a is a round hole with a diameter of 0.05-3mm. The circular hole design of the discharge hole 41a avoids material from getting stuck in the channel, and at the same time facilitates processing and manufacturing, ensuring that the inner wall of the channel is smooth. The small-diameter discharge hole 41a is suitable for fine powder materials, while the large-diameter discharge hole 41a is suitable for coarse particle materials. This ensures that the material falls back without affecting the material mixing effect during normal conveying.

[0045] It should be noted that in this invention, materials can be conveyed by gravity, airflow, conveyor belts, or a combination thereof, or other conveying methods. Those skilled in the art can flexibly configure the material conveying method according to specific application scenarios. Preferably, the dual-channel mixing device further includes an airflow conveying mechanism 5. The specific gas conveying method of the airflow conveying mechanism 5 is not limited here; the airflow can be a thrust airflow, a suction airflow, or a combination of thrust and suction airflow. Using the airflow conveying mechanism 5 not only enables the mixing and conveying of materials but also allows control of the material feeding rate by controlling the airflow magnitude. Furthermore, the use of airflow to convey the mixed materials makes the material transport more active under the influence of the airflow, further improving the mixing effect. In some possible implementations, the airflow of the pneumatic conveying mechanism 5 is a thrust airflow. The pneumatic conveying mechanism 5 is connected to the inlet of the first conveying pipe 1 and the inlet of the second conveying pipe 2, respectively. At this time, the pneumatic conveying mechanism 5 blows air into the first conveying pipe 1 and the second conveying pipe 2, respectively, to push the material in the first conveying pipe 1 and the second conveying pipe 2 to the mixing pipe 3. The pneumatic conveying mechanism 5 may include a blowing unit, which blows air into the interior of the first conveying pipe 1 and the interior of the second conveying pipe 2, respectively. The pneumatic conveying mechanism 5 may also include two blowing units, one of which is connected to the inlet of the first conveying pipe 1 and the other of which is connected to the inlet of the second conveying pipe 2. In the above, each blowing unit may have one or more blowing machines.

[0046] In some other possible embodiments, the airflow of the pneumatic conveying mechanism 5 is a suction airflow. The pneumatic conveying mechanism 5 is connected to the outlet of the mixing pipe 3. In this case, the pneumatic conveying mechanism 5 draws in air, creating a negative pressure in the mixing pipe 3, the first conveying pipe 1, and the second conveying pipe 2. Materials are drawn in from the first conveying pipe 1 and the second conveying pipe 2 respectively and enter the mixing pipe 3 to achieve material mixing. In this case, the pneumatic conveying mechanism 5 can be one or more negative pressure fans. For example, Figure 1 The airflow conveying mechanism 5 shown is a suction airflow mechanism, and the airflow conveying mechanism 5 is a negative pressure fan.

[0047] In some other possible implementations, the pneumatic conveying mechanism 5 includes a thrust airflow assembly and a suction airflow assembly. The thrust airflow assembly is connected to the inlet of the first conveying pipe 1 and the inlet of the second conveying pipe 2, respectively, and the suction airflow assembly is connected to the outlet of the mixing pipe 3. The combination of thrust and suction airflow can not only cope with the resistance loss of long-distance conveying but also maintain a stable material intake environment. Furthermore, by balancing and adjusting the thrust and suction, the flow rate of the material in the mixing pipe 3 can be controlled to keep the mixing process within the optimal parameter range, thereby improving the material mixing effect. Specifically, the thrust airflow assembly may include an air blowing unit that blows air into the interior of the first conveying pipe 1 and the interior of the second conveying pipe 2. The thrust airflow assembly may also include two air blowing units, one connected to the inlet of the first conveying pipe 1 and the other connected to the inlet of the second conveying pipe 2. In the above, each air blowing unit may have one or more air blowers, and the suction airflow assembly may be one or more negative pressure fans.

[0048] In some possible implementations, the airflow conveying mechanism 5 is a suction airflow mechanism, and a filter dust removal component is provided between the airflow conveying mechanism 5 and the mixing pipe 3.

[0049] In some possible implementations, the dual-channel mixing device further includes a mixing silo 6, which is connected to the outlet of the mixing pipe 3. The mixing silo 6 serves as a temporary storage and buffer container for the mixed material, ensuring a smooth transition from a dynamic mixing state to a static storage state. It provides the necessary buffer capacity to balance production fluctuations between upstream and downstream processes, reduces intermediate equipment, improves the overall compactness of the device layout, and enables continuous material feeding operations, thereby improving the feeding efficiency after material mixing. When the airflow of the aforementioned pneumatic conveying mechanism 5 is a suction airflow, the pneumatic conveying mechanism 5, for example, a negative pressure fan, can be installed on the mixing silo 6. The mixing silo 6 connects the negative pressure fan to the outlet of the mixing pipe 3, creating a negative pressure state within the mixing silo 6, allowing the material in the mixing pipe 3 to be drawn into the mixing silo 6. More preferably, the outlet of the mixing silo 6 is equipped with a silo control switch, which controls the discharge of the mixed material. In some possible implementations, a dust removal filter assembly can be installed at the top of the mixing silo 6, between the negative pressure fan and the outlet of the mixing pipe 3.

[0050] On the other hand, this utility model also provides a battery black powder calcination and reduction system, including a screw feeder, a rotary kiln, a post-processing device, and the aforementioned dual-channel mixing device; a first conveying pipe 1 is used to convey black powder, and a second conveying pipe 2 is used to convey a reducing agent. The mixing silo 6, the screw feeder, and the rotary kiln are connected in sequence. The screw feeder is equipped with an exhaust gas discharge pipe, which is connected to the post-processing device. The battery black powder calcination and reduction system integrates the aforementioned dual-channel mixing device, wherein the first conveying pipe 1 is used to convey battery black powder, and the second conveying pipe 2 is used to convey a reducing agent (for example, when the battery is a lithium battery, the reducing agent...). Carbon powder can be selected. After the two materials are fully mixed in the mixing pipe 3, they enter the mixing silo 6 for temporary storage. The screw feeder is connected between the outlet of the mixing silo 6 and the feed inlet of the rotary kiln equipment, which plays the role of sealing and quantitative conveying. The screw feeder uses a screw pushing method to realize material conveying. At the same time, the material in the screw feeder can also perform preliminary filtration of the exhaust gas generated by the rotary kiln equipment. The rotary kiln equipment provides a roasting and reduction environment for black powder and reducing agent, converting metal oxides into metals or low-valence oxides. The post-treatment equipment is used to treat the exhaust gas generated by the rotary kiln equipment, removing dust and harmful components until the emission standards are met before discharge.

[0051] With this setup, the dual-channel mixing device integrates the functions of conveying and mixing black powder and reducing agent, eliminating the need for a separate mixer. Black powder and reducing agent are dynamically mixed during the conveying process of the dual-channel mixing device, ensuring uniform dispersion of black powder and reducing agent, improving the mixing effect of black powder and reducing agent, and ensuring that the mixed materials are fully contacted before entering the rotary kiln equipment, increasing the reaction interface area, making the reduction reaction more thorough, and thus improving the purity of the final product. The calcination environment provided by the rotary kiln equipment ensures that the materials are heated evenly, avoiding local overheating or incomplete reaction, and improving the long-term stability of the system.

[0052] It should be understood that the specific embodiments described above are merely illustrative or explanatory of the principles of this utility model and do not constitute a limitation thereof. Therefore, any modifications, equivalent substitutions, improvements, etc., made without departing from the spirit and scope of this utility model should be included within its protection scope. Furthermore, the appended claims are intended to cover all variations and modifications falling within the scope and boundaries of the appended claims, or equivalent forms of such scope and boundaries.

Claims

1. A dual-channel mixing device, characterized in that, The dual-channel mixing device includes a first conveying pipe, a second conveying pipe, and a mixing pipe. The first conveying pipe and the second conveying pipe are connected in parallel and are both connected to the mixing pipe. The mixing pipe is provided with at least one mixing baffle group, which includes multiple mixing baffles arranged at intervals along the material conveying direction. The multiple mixing baffles are configured to improve the mixing effect of the material being conveyed in the mixing pipe.

2. The dual-channel mixing device according to claim 1, characterized in that, The mixing pipe is arranged vertically or inclined relative to the horizontal plane, and each mixing baffle is arranged inclined relative to the inner wall of the mixing pipe.

3. The dual-channel mixing device according to claim 2, characterized in that, The number of mixing baffle groups is multiple, and the mixing baffles in each mixing baffle group are staggered with the mixing baffles in other mixing baffle groups along the axial direction of the mixing pipe.

4. The dual-channel mixing device according to claim 3, characterized in that, The mixing pipe has a circular cross-section, and multiple mixing baffle assemblies are evenly arranged along the circumference of the mixing pipe cross-section.

5. The dual-channel mixing device according to claim 4, characterized in that, The number of mixing baffle assemblies is two, three, or four; When there are two mixing baffle groups, the two mixing baffle groups are respectively arranged on the inner wall of the mixing pipe at a 180° interval; When there are three mixing baffle groups, the three mixing baffle groups are respectively arranged on the inner wall of the mixing pipe at 120° intervals; When there are four mixing baffle groups, the four mixing baffle groups are respectively arranged on the inner wall of the mixing pipe at 90° intervals.

6. The dual-channel mixing device according to claim 2, characterized in that, All or part of the mixing baffle is provided with a material discharge hole at one end near the inner wall of the mixing pipe, and the material discharge hole is configured to allow the material to fall back when the conveying stops.

7. The dual-channel mixing device according to claim 6, characterized in that, The material discharge hole is a round hole with a diameter of 0.05-3mm.

8. The dual-channel mixing device according to claim 1, characterized in that, The dual-channel mixing device also includes an airflow conveying mechanism; When the airflow in the airflow conveying mechanism is a thrust airflow, the airflow conveying mechanism is connected to the inlet of the first conveying pipe and the inlet of the second conveying pipe, respectively; When the airflow in the airflow conveying mechanism is a suction airflow, the airflow conveying mechanism is connected to the outlet of the mixing pipe; In the case where the airflow conveying mechanism includes a thrust airflow assembly and a suction airflow assembly, the thrust airflow assembly is connected to the inlet of the first conveying pipe and the inlet of the second conveying pipe, respectively, and the suction airflow assembly is connected to the outlet of the mixing pipe.

9. The dual-channel mixing device according to any one of claims 1 to 8, characterized in that, The dual-channel mixing device also includes a mixing silo, which is connected to the outlet of the mixing pipeline.

10. A battery black powder calcination and reduction system, characterized in that, The black powder roasting and reduction system includes a screw feeder, a rotary kiln, a post-processing device, and the dual-channel mixing device as described in claim 9. The first conveying pipe is used to convey black powder, the second conveying pipe is used to convey reducing agent, the mixing silo, the screw feeder and the rotary kiln are connected in sequence, the screw feeder is equipped with an exhaust gas discharge pipe, and the exhaust gas discharge pipe is connected to the post-processing equipment.

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