Iron phosphate drying device for wet recovery

Abstract

The utility model discloses an iron phosphate drying device for wet recovery. Belongs to the technical field of lithium iron phosphate wet recovery. According to the technical key points, the device comprises a kettle body and a discharge pipe arranged at the bottom of the kettle body, a hot air assembly is arranged at the upper end of the kettle body, and an air return assembly is arranged near the lower end of the kettle body; a rotating hopper is arranged in the kettle body through a rotating shaft, and the rotating shaft is connected with a servo motor; a feeding pipe is arranged on the side wall of the kettle body above the rotating hopper; a plurality of collision blocks are distributed on the inner surface of the rotating hopper; an air uniformizing screen plate is arranged between the rotating hopper and the hot air assembly; the utility model aims to provide the iron phosphate drying device for wet recovery, which is simple in structure and can uniformly disperse iron phosphate; the drying device is used for drying anhydrous iron phosphate generated in wet recovery of lithium iron phosphate.

Description

Technical Field

[0001] The utility model relates to a drying device, and more specifically, to a ferric phosphate drying device for wet recovery. Background Art

[0002] Ferric phosphate, also known as ferric orthophosphate and ferric phosphate, is a white or grayish-white monoclinic crystal powder, which has many characteristics such as long service life, recyclability, no pollution, and low price. Therefore, it has been widely used in many fields. Its main uses are in the manufacture of lithium iron phosphate battery materials, catalysts, ceramics, etc., and it is particularly common in the application of new energy power batteries.

[0003] The wet recovery process of lithium iron phosphate uses waste lithium iron phosphate and glucose as raw materials to comprehensively recover and produce lithium iron phosphate cathode materials, and at the same time, ferric phosphate will be produced for the production of lithium iron phosphate. After the production of ferric phosphate, processes such as drying and dehydration of ferric phosphate are required. In current drying equipment, ferric phosphate powder materials are all piled up inside the drying box. The ferric phosphate powder materials piled up inside cannot be fully dried, the drying is uneven, and the wet ferric phosphate powder materials are easy to stick and agglomerate, making it difficult to dry and affecting subsequent production and use. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a ferric phosphate drying device for wet recovery with a simple structure and capable of evenly dispersing powder materials in view of the above-mentioned deficiencies of the prior art.

[0005] The technical solution of the utility model is realized as follows: A ferric phosphate drying device for wet recovery includes a kettle body and a discharge pipe provided at the bottom of the kettle body. A hot air component is provided at the upper end of the kettle body, and a return air component is provided near the end of the lower end of the kettle body; a rotating bucket is provided in the kettle body through a rotating shaft, and the rotating shaft is connected to a servo motor; a feed pipe is provided on the side wall of the kettle body above the rotating bucket, and a number of collision blocks are distributed on the inner surface of the rotating bucket; a uniform air net plate is provided between the rotating bucket and the hot air component.

[0006] In the above-mentioned ferric phosphate drying device for wet recovery, the hot air component includes a trough-shaped end cover provided at the upper end of the kettle body, and the uniform air net plate is provided at the opening end of the trough-shaped end cover and cooperates with it to form a heating chamber; a number of heating units are provided in the trough-shaped end cover, and an air inlet pipe is connected to the side wall of the trough-shaped end cover.

[0007] In the above-mentioned ferric phosphate drying device for wet recovery, the uniform air net plate includes a mounting frame adapted to the inner wall of the kettle body, and a uniform air net is provided in the mounting frame; a mounting ring threadedly connected to the inner wall of the trough-shaped end cover is provided on the mounting frame.

[0008] In the above-mentioned iron phosphate drying device for wet recovery, the air return assembly includes an air return pipe arranged at the near end of the lower end of the kettle body and connected to the hot air assembly, and a negative pressure pump is provided between the air return pipe and the hot air assembly; a filtering assembly is arranged in the kettle body at the position of the air return pipe.

[0009] In the above-mentioned iron phosphate drying device for wet recovery, the filtering assembly includes an installation ring pipe arranged in the kettle body, and the inner diameter of the installation ring pipe is larger than the inner diameter of the air return pipe; a filter cloth bag is detachably arranged at the front end of the installation ring pipe; an elastic assembly matched with the filter cloth bag is arranged in the installation ring pipe, and a knocking hammer for knocking the filter cloth bag is hinged on the outer wall of the rotating hopper.

[0010] In the above-mentioned iron phosphate drying device for wet recovery, the cross-section of the rotating hopper is two V-shaped hoppers symmetric along the rotating shaft, and the bottom end of the side wall of the inner rotating hopper is below the bottom end of the outer side wall.

[0011] After the present utility model adopts the above structure, the rotating hopper is controlled by a servo motor to rotate at a variable speed, so that the iron phosphate powder material tumbles continuously in the rotating hopper, and all the iron phosphate powder materials can reach the surface for heating and drying. At the same time, during the tumbling process, the iron phosphate will collide with the collision blocks, keeping it in a loose state and avoiding caking, so that the iron phosphate powder material is fully dried, ensuring the uniformity of drying and improving the drying efficiency.

[0012] By arranging the air distribution grid plate, the hot air can be evenly blown onto the rotating hopper, ensuring that the iron phosphate powder materials at various parts of the rotating hopper receive the same heating effect, and further improving the uniformity of drying. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The following further describes the present utility model in detail with reference to the embodiments in the drawings, but it does not constitute any limitation to the present utility model.

[0014] Figure 1 is a schematic structural diagram of the present utility model;

[0015] Figure 2 is a partial structural schematic diagram at position A of the present utility model;

[0016] Figure 3 is a structural schematic diagram of the air distribution grid plate of the present utility model;

[0017] Figure 4 is a structural schematic diagram of the rotating hopper of the present utility model.

[0018] In the figure: 1, kettle body; 2, discharge pipe; 3, hot air assembly; 3a, grooved end cover; 3b, heating unit; 3c, air inlet pipe; 4, return air assembly; 4a, return air pipe; 4b, filter assembly; 4c, mounting ring pipe; 4d, filter bag; 4e, elastic assembly; 4f, knocking hammer; 5, rotating shaft; 6, rotating bucket; 7, feed pipe; 8, collision block; 9, uniform air mesh plate; 9a, mounting frame; 9b, uniform air mesh; 9c, mounting ring. DETAILED DESCRIPTION

[0019] See also Figures 1-4 As shown, the utility model is a ferric phosphate drying device for wet recovery, comprising a kettle body 1 and a discharge pipe 2 arranged at the bottom of the kettle body 1, a hot air assembly 3 is arranged at the upper end of the kettle body 1, and a return air assembly 4 is arranged at the proximal end of the lower end of the kettle body 1; a rotating bucket 6 is arranged in the kettle body 1 through a rotating shaft 5, and the rotating shaft 5 is connected to a servo motor; a feeding pipe 7 is arranged on the side wall of the kettle body 1 above the rotating bucket 6, and a plurality of collision blocks 8 are distributed on the inner surface of the rotating bucket 6; a uniform wind mesh plate 9 is arranged between the rotating bucket 6 and the hot air assembly 3. The servo motor performs variable speed motion. When the rotating bucket rotates faster or slower, the ferric phosphate powder will roll under the action of inertia, and the powder located below will roll to the surface, so that all the ferric phosphate powder can reach the surface for heating and drying. In order to increase the rolling amplitude of the powder, the servo motor can also be set to change direction rotation. At the same time, during the tumbling process, the iron phosphate will collide with the collision block, keeping it in a loose state to avoid agglomeration, so that the iron phosphate powder can be fully dried, ensuring the uniformity of drying and improving the drying efficiency.

[0020] During the rotation of the rotating bucket, a small amount of iron phosphate powder will fall from the bottom discharge port or the upper opening of the rotating bucket to the bottom of the kettle body below. The amount of this powder is small and it is not easy to agglomerate when it falls to the bottom of the kettle body.

[0021] By setting up a uniform wind screen, the hot air can be evenly blown onto the rotating bucket, ensuring that the iron phosphate powder at each location on the rotating bucket is subjected to the same heating effect, further improving the uniformity of drying.

[0022] The discharge pipe is provided with corresponding discharge valves and other structures, which is common knowledge for those skilled in the art and will not be described in detail here.

[0023] In this embodiment, the hot air assembly 3 includes a trough-shaped end cover 3a disposed at the upper end of the kettle body 1. The air distribution screen plate 9 is disposed at the open end of the trough-shaped end cover 3a and cooperates with it to form a heating chamber. A plurality of heating units 3b are provided in the trough-shaped end cover 3a, and an air inlet pipe 3c is connected to the side wall of the trough-shaped end cover 3a. The air inlet pipe is connected to an external air source. By arranging the heating units in the trough-shaped end cover to heat the air flow to form hot air, the heat generated by the heating units can directly reach the inside of the kettle body completely, reducing the heat loss during the pipeline transportation of the hot air and improving the utilization rate of heat.

[0024] Further preferably, the air distribution screen plate 9 includes a mounting frame 9a adapted to the inner wall of the kettle body 1. An air distribution screen 9b is provided in the mounting frame 9a. A mounting ring 9c threadedly connected to the inner wall of the trough-shaped end cover 3a is provided on the mounting frame 9a. This structure facilitates the disassembly, assembly, and replacement of the air distribution screen plate. A bracket and a bearing for cooperating with the rotating shaft are provided on the air distribution screen to ensure the installation of the bearing and provide support for the bearing.

[0025] In this embodiment, the air return assembly 4 includes an air return pipe 4a disposed near the end of the lower end of the kettle body 1 and connected to the hot air assembly 3. A negative pressure pump is provided between the air return pipe 4a and the hot air assembly 3. A filtering assembly 4b is provided in the kettle body 1 at the position of the air return pipe 4a. By providing the filtering assembly, it is possible to prevent the powder material from entering the air return pipe, avoiding damage to equipment such as the negative pressure pump, and at the same time ensuring that the powder material can be smoothly discharged and collected through the discharge pipe.

[0026] Further preferably, the filtering assembly 4b includes a mounting ring pipe 4c provided in the kettle body 1. The inner diameter of the mounting ring pipe 4c is larger than the inner diameter of the air return pipe 4a. A filter cloth bag 4d is detachably provided at the front end of the mounting ring pipe 4c. An elastic assembly 4e cooperating with the filter cloth bag 4d is provided in the mounting ring pipe 4c. A knocking hammer 4f for knocking the filter cloth bag 4d is hinged on the outer wall of the rotating hopper 6. The elastic assembly includes a mounting bracket provided in the mounting ring pipe. An elastic bracket made of an elastic thin sheet material is provided on the mounting bracket. The filter cloth bag bulges towards the rotating hopper side in an arc shape under the support of the elastic bracket. During the rotation process, the knocking hammer will strike the bulging position of the filter cloth bag, causing the filter cloth bag to vibrate and separating the attached iron phosphate powder material. And in order to prevent the powder material shaken by knocking from staying at the upper end of the filter cloth bag, an inclined mounting surface can be provided at the front end of the mounting ring pipe to install the filter cloth bag in a downward inclined manner.

[0027] In this embodiment, the cross-section of the rotary hopper 6 is two V-shaped hoppers symmetrical about the rotating shaft 5, and the bottom end of the side wall of the inner rotary hopper 6 is located below the bottom end of the outer side wall. Since most of the iron phosphate powder is located on the outer side during the centrifugal rotation on the rotary hopper, after adopting this structure, when the iron phosphate powder slides down along the outer side wall, it will first fall on the inner side wall and then slide down and output, which can avoid the powder from directly outputting from below after falling into the rotary hopper, increase the drying time of the powder in the rotary hopper, and ensure the drying effect.

[0028] During operation, first start the heating component and the external air supply component to produce hot air to preheat the kettle body. After preheating for a period of time, start the servo motor to rotate the rotary hopper, input the iron phosphate powder into the rotary hopper through the feed pipe for dispersion drying, and output the dried iron phosphate powder through the discharge pipe.

[0029] The above-mentioned embodiments are the preferred embodiments of the present invention, which are only used to conveniently illustrate the present invention and are not intended to limit the present invention in any form. Any person with ordinary knowledge in the technical field, if without departing from the technical features of the present invention, uses the equivalent embodiments obtained by making partial changes or modifications to the technical content disclosed by the present invention and without departing from the technical feature content of the present invention, still belongs to the scope of the technical features of the present invention.

Claims

1. A ferric phosphate drying device for wet recovery, comprising a kettle body (1) and a discharge pipe (2) arranged at the bottom of the kettle body (1), characterized in that, The upper end of the kettle body (1) is provided with a hot air component (3), and a return air component (4) is provided near the end of the lower end of the kettle body (1); a rotating hopper (6) is arranged in the kettle body (1) through a rotating shaft (5), and the rotating shaft (5) is connected to a servo motor; a feed pipe (7) is arranged on the side wall of the kettle body (1) above the rotating hopper (6), and a number of collision blocks (8) are distributed on the inner surface of the rotating hopper (6); a uniform air distribution screen plate (9) is arranged between the rotating hopper (6) and the hot air component (3).

2. The iron phosphate drying device for wet recovery according to claim 1, characterized in that The hot air component (3) includes a trough-shaped end cover (3a) arranged at the upper end of the kettle body (1), and the uniform air distribution screen plate (9) is arranged at the opening end of the trough-shaped end cover (3a) and cooperates with it to form a heating chamber; a number of heating units (3b) are arranged in the trough-shaped end cover (3a), and an air inlet pipe (3c) is connected to the side wall of the trough-shaped end cover (3a).

3. The iron phosphate drying device for wet recovery according to claim 2, characterized in that, The uniform air distribution screen plate (9) includes a mounting frame (9a) adapted to the inner wall of the kettle body (1), and a uniform air distribution screen (9b) is arranged in the mounting frame (9a); a mounting ring (9c) threadedly connected to the inner wall of the trough-shaped end cover (3a) is arranged on the mounting frame (9a).

4. A ferric phosphate drying device for wet recovery according to claim 1, characterized in that, The return air component (4) includes a return air pipe (4a) arranged near the end of the lower end of the kettle body (1) and connected to the hot air component (3), and a negative pressure pump is arranged between the return air pipe (4a) and the hot air component (3); a filtering component (4b) is arranged in the kettle body (1) at the position of the return air pipe (4a).

5. A ferric phosphate drying device for wet recovery according to claim 4, characterized in that, The filtering component (4b) includes a mounting ring pipe (4c) arranged in the kettle body (1), and the inner diameter of the mounting ring pipe (4c) is larger than the inner diameter of the return air pipe (4a); a filter cloth bag (4d) is detachably arranged at the front end of the mounting ring pipe (4c); an elastic component (4e) cooperating with the filter cloth bag (4d) is arranged in the mounting ring pipe (4c), and a knocking hammer (4f) for knocking the filter cloth bag (4d) is hinged on the outer wall of the rotating hopper (6).

6. A ferric phosphate drying device for wet recovery according to claim 1, characterized in that, The cross section of the rotating hopper (6) is two V-shaped hoppers symmetric about the rotating shaft (5), and the bottom end of the side wall of the rotating hopper (6) located inside is below the bottom end of the outer side wall.

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