Drying device for preparing lithium manganese iron phosphate by liquid phase method

Abstract

The utility model discloses a drying device for preparing lithium manganese iron phosphate by a liquid phase method, and relates to the technical field of lithium manganese iron phosphate. The device comprises a drying cylinder, a cyclone separator and a high-pressure air pump, a rotating motor is clamped and fixed to one end of the drying cylinder, a filter element is clamped to one end of the rotating motor, a second ventilation frame is welded to the bottom of the peripheral face of the drying cylinder in a penetrating mode, the cyclone separator is arranged at one end of the drying cylinder, and a discharging hopper is clamped to the bottom of the cyclone separator in a penetrating mode; a high-pressure air pump is arranged on one side of the second ventilation frame, and a steam-water separation assembly is arranged at the top of the high-pressure air By arranging the drying cylinder, the cyclone separator and the high-pressure air pump, the problems that lithium manganese iron phosphate is difficult to dry in a hot air drying mode in the drying process, and when powdery lithium manganese iron phosphate is discharged, a small amount of powder is easy to remain in the device, and auxiliary powder discharging through a vibration structure and the like is needed are solved.

Description

Technical Field

[0001] This utility model belongs to the field of lithium manganese iron phosphate technology, and in particular relates to a drying device for preparing lithium manganese iron phosphate by liquid phase method. Background Technology

[0002] Lithium manganese iron phosphate (LMP) is a novel phosphate-based lithium-ion battery cathode material formed by doping lithium iron phosphate with a certain proportion of manganese. The doping of manganese effectively combines the advantages of both iron and manganese. Furthermore, manganese and iron are both located in the fourth period of the periodic table and are adjacent to each other, possessing similar ionic radii and some chemical properties; therefore, doping does not significantly affect the original structure. The preparation methods of LMP can be divided into two main categories: solid-phase methods and liquid-phase methods. Liquid-phase methods include solvothermal methods, sol-gel methods, and co-precipitation methods, which have advantages such as good compatibility with raw materials and high product quality. However, in the process of preparing LMP using liquid-phase methods, a drying device is needed to dry the produced LMP for further processing. But in practical applications, it still has the following drawbacks:

[0003] The utility model disclosed in CN220169873U is a lithium iron phosphate drying device. The conveyor is fixedly connected to one end of the main body, the first fixed platform is fixedly connected to the adsorption hood, the second fixed platform is fixedly connected to the dehumidification layer, and the support platform is fixedly connected to the first drying structure. Since lithium manganese iron phosphate is in powder form after processing, it is often not suitable to process it with high-temperature airflow during drying to avoid the powder moving with the airflow. When the powder is limited by the sieving structure and then dried by airflow, the powder is easy to move and block the sieving structure, resulting in poor drying effect. When a large amount of lithium manganese iron phosphate powder is heated and dried by heating structure alone, the contact area between the accumulated powder and the air is small, which is often difficult to dry quickly.

[0004] When drying equipment discharges powdered materials, due to the large structure of the drying equipment and the presence of many dead corners on its inner side, powder often tends to remain inside the equipment. It is necessary to use a vibration structure to drive the equipment to vibrate, so that the remaining powder is vibrated and discharged, which increases the cost and maintenance expenses of the equipment. Utility Model Content

[0005] The purpose of this invention is to provide a drying device for preparing lithium manganese iron phosphate by liquid phase method. By using a drying cylinder, cyclone separator and high-pressure air pump, it solves the problems that lithium manganese iron phosphate is difficult to dry by hot air during the drying process, and that when powdered lithium manganese iron phosphate is discharged, a small amount of powder is easy to remain in the device, requiring the use of vibration structure or other means to assist in the discharge of powder, which increases the cost and maintenance expenses of the device.

[0006] To solve the above-mentioned technical problems, this utility model is achieved through the following technical solution:

[0007] This utility model relates to a drying device for preparing lithium manganese iron phosphate by liquid phase method, comprising a drying cylinder, a cyclone separator, and a high-pressure air pump. A rotating motor is fixedly connected to one end of the drying cylinder, and a filter element is fixedly connected to one end of the rotating motor. The filter element is rotatably connected to one end of the drying cylinder. A second ventilation frame is welded through the bottom of the outer circumference of the drying cylinder. A cyclone separator is provided at one end of the drying cylinder, and a discharge hopper is fixedly connected through the bottom of the cyclone separator. A high-pressure air pump is provided on one side of the second ventilation frame, and a gas-water separation component is provided on one side of the top of the high-pressure air pump.

[0008] The rotating motor drives the filter element to rotate inside the drying drum, continuously adjusting the contact position between the airflow and the filter element. When the high-pressure air pump draws air into the inside of the drying drum, the airflow can backflush the bottom of the filter element, clearing away clogged powder. This eliminates the need for additional cleaning structures and improves the efficiency of airflow through the filter element. The airflow further moves the lithium manganese iron phosphate powder inside the filter element, increasing the contact area between the airflow and the powder, thus further improving the drying efficiency of lithium manganese iron phosphate. Simultaneously, the rotation of the filter element further moves a large amount of accumulated powder, improving drying efficiency. During the hot air drying process, the air-water separation component separates moisture and airflow, ensuring that the air entering the drying drum is dry and improving drying efficiency. When discharging the lithium manganese iron phosphate powder, opening the cyclone separator and the exhaust pipe allows outside air to enter the drying drum. The powder inside the drying drum is then carried by the airflow into the cyclone separator, where it is separated from the air and collected in the discharge hopper. The device has a simple structure, is easy to operate, and reduces production costs and maintenance expenses.

[0009] Furthermore, a feed hopper is welded through to the top of one end of the drying cylinder, and the feed hopper is in communication with the filter element. A first ventilation frame is welded through to the top of the outer circumference of the drying cylinder. The feed hopper and the cyclone separator are located at the other end of the drying cylinder relative to the rotating motor. The bottom of the first ventilation frame is attached to the top of the outer circumference of the filter element.

[0010] When the powder inside the drying drum is dried by high-temperature airflow, the airflow enters the filter element through the second ventilation frame, causing the lithium manganese iron phosphate powder inside the filter element to move, increasing the contact area between the airflow and the powder, and further improving the drying efficiency of lithium manganese iron phosphate. Then, the airflow containing a large amount of moisture enters the air-water separation component through the first ventilation frame for drying, quickly drying the powder. At the same time, the rotating motor can drive the filter element to rotate inside the drying drum, constantly adjusting the contact position between the airflow and the filter element. When the high-pressure air pump enters the inner side of the filter element through the bottom of the second ventilation frame, it can back-blown the bottom of the filter element, cleaning the powder that is blocked on the inner wall of the filter element when the airflow enters the first ventilation frame through the top of the filter element. No additional cleaning structure is required, and the efficiency of airflow through the filter element is improved. At the same time, the rotation of the filter element can further drive the movement of a large amount of accumulated powder, improving the drying efficiency.

[0011] Furthermore, a heating tube is snapped into the second ventilation frame, a drain pipe is welded through the bottom of one end of the second ventilation frame, a partition is snapped into the second ventilation frame, a number of one-way valves are snapped through the top of the partition, the partition is located at the bottom of the heating tube, and the top of the second ventilation frame is attached to the bottom of the outer circumference of the filter element.

[0012] When lithium manganese iron phosphate powder is poured into the filter element through the feed hopper, the large amount of moisture contained in the powder can fall through the filter element to the top of the partition under the action of gravity, and then fall to the bottom of the second ventilation rack through the one-way valve. Finally, the moisture is discharged by opening the drain pipe at regular intervals, which improves the drying efficiency of the powder. When the airflow enters the inner side of the second ventilation rack, the airflow can be heated by the heating tube to improve the evaporation efficiency of the moisture.

[0013] Furthermore, a connecting pipe and an exhaust pipe are respectively welded through to both ends of the outer peripheral surface of the cyclone separator, a discharge pipe is welded through to the bottom of the discharge hopper, one end of the connecting pipe is inserted and snapped into the bottom of one end of the drying cylinder, and the connecting pipe and the filter element are connected through the filter element.

[0014] During discharge, the connecting pipe is opened and the solenoid valve of the high-pressure air pump is closed, allowing outside air to be drawn into the drying cylinder through the high-pressure air pump. This causes the powder to be carried by the airflow into the cyclone separator. Under the action of gravity, the powder falls into the discharge hopper. After all the powder in the drying cylinder is discharged, the high-pressure air pump is turned off and the discharge pipe is opened to discharge the powder. The discharge hopper has a simple internal structure, which does not easily lead to powder residue. It does not require an additional vibration structure, thus reducing production costs and maintenance expenses.

[0015] Furthermore, a vent pipe is inserted through and snapped into the top of the high-pressure air pump, a steam-water separation component is inserted through and snapped into the other end of the vent pipe, an exhaust pipe is inserted through and snapped into the top of the steam-water separation component, a solenoid valve is inserted through and snapped into one end of the outer circumference of the exhaust pipe, and one end of the exhaust pipe is inserted through and snapped into one side of the first ventilation frame. The vent pipe is located between the solenoid valve and the first ventilation frame.

[0016] When the airflow containing moisture is drawn into the extraction pipe, the air and moisture are separated by the air-water separation component to prevent the high-humidity air from re-entering the drying chamber and ensure the drying efficiency of the powder. The device can be equipped with a one-way air pressure valve located between the air extraction pipe and the air-water separation component and the first ventilation frame to further ensure that outside air quickly enters the drying cylinder during the discharge process and drives the powder to be discharged.

[0017] Furthermore, one end of the high-pressure air pump is connected to an air inlet pipe, and the other end of the air inlet pipe is connected to one side of the second ventilation frame. The air inlet pipe is located between the heating pipe and the partition.

[0018] A high-pressure air pump drives the airflow, allowing the air inside the drying chamber to enter the air-water separation component for drying through the extraction pipe. The dried air is then returned to the drying chamber through the return pipe to dry the powder, greatly improving processing efficiency.

[0019] This utility model has the following beneficial effects:

[0020] This invention addresses the problem of lithium manganese iron phosphate being in powder form during the later stages of processing. High-temperature airflow is often unsuitable for drying such powder, as it can cause movement. While sieving structures can limit powder movement, airflow drying can lead to clogging and poor drying results. Heating large quantities of lithium manganese iron phosphate powder solely with a heating structure results in a small contact area between the accumulated powder and air, hindering rapid drying. This invention utilizes an airflow to dry the lithium manganese iron phosphate powder within the drying cylinder. During the drying process, airflow enters the filter element through the second ventilation frame, causing the lithium manganese iron phosphate powder inside the filter element to move, increasing the contact area between the airflow and the powder, and further improving the drying efficiency of lithium manganese iron phosphate. At the same time, the rotating motor drives the filter element to rotate inside the drying cylinder, continuously adjusting the contact position between the airflow and the filter element. This allows the airflow to backflush the bottom of the filter element when it enters the inner side of the filter element through the bottom of the second ventilation frame, cleaning the powder that gets stuck on the inner wall of the filter element when it enters the first ventilation frame through the top of the filter element. This eliminates the need for additional cleaning structures and improves drying efficiency.

[0021] This invention solves the problem of powder residue in drying devices when discharging powdery materials. Due to the large size of the drying device and numerous dead corners, powder often remains inside, requiring a vibration structure to dissipate the residue, thus increasing costs and maintenance. Instead, the invention opens the connecting pipe and closes the solenoid valve of the high-pressure air pump, allowing outside air to be drawn into the drying drum. This airflow carries the powder into the cyclone separator, where it falls into the discharge hopper under gravity. Once all the powder is discharged from the drying drum, the high-pressure air pump is turned off, and the discharge pipe is opened to release the powder. The discharge hopper has a simple structure, reducing powder residue and eliminating the need for an additional vibration structure, thus lowering production costs and maintenance expenses. Attached Figure Description

[0022] Figure 1 This is a structural rendering of the present invention;

[0023] Figure 2 This is a structural diagram of the drying cylinder of this utility model;

[0024] Figure 3 This is a cross-sectional view of the drying cylinder of this utility model;

[0025] Figure 4 This is a structural diagram of the cyclone separator of this utility model;

[0026] Figure 5 This is a structural diagram of the high-pressure air pump of this utility model.

[0027] Figure label:

[0028] 1. Drying drum; 101. Rotary motor; 102. Feed hopper; 103. First ventilation frame; 104. Second ventilation frame; 105. Drain pipe; 106. Filter element; 107. Heating tube; 108. Partition plate; 109. One-way valve; 2. Cyclone separator; 201. Connecting pipe; 202. Exhaust pipe; 203. Discharge hopper; 204. Discharge pipe; 3. High-pressure air pump; 301. Air-water separation assembly; 302. Vent pipe; 303. Inlet pipe; 304. Extraction pipe; 305. Solenoid valve. Detailed Implementation

[0029] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention.

[0030] Please see Figure 1-5As shown, this utility model is a drying device for preparing lithium manganese iron phosphate by liquid phase method, including a drying cylinder 1, a cyclone separator 2 and a high-pressure air pump 3. A rotating motor 101 is fixedly connected to one end of the drying cylinder 1, and a filter element 106 is fixedly connected to one end of the rotating motor 101. The filter element 106 is rotatably connected to one end of the drying cylinder 1. A second ventilation frame 104 is welded through the bottom of the outer circumference of the drying cylinder 1. A cyclone separator 2 is provided at one end of the drying cylinder 1. A discharge hopper 203 is fixedly connected through the bottom of the cyclone separator 2. A high-pressure air pump 3 is provided on one side of the second ventilation frame 104. A gas-water separation component 301 is provided on one side of the top of the high-pressure air pump 3.

[0031] A large amount of lithium manganese iron phosphate powder containing moisture is poured into filter element 106 through feed hopper 102. The remaining moisture falls through filter element 106 to the bottom of the second ventilation frame 104 under gravity. Feed hopper 102, cyclone separator 2, and solenoid valve 305 are then closed. High-pressure air pump 3 is then controlled to drive airflow, continuously passing the powder through filter element 106 for drying. Simultaneously, rotating motor 101 rotates filter element 106 within drying cylinder 1, continuously adjusting the contact position between the airflow and filter element 106. This ensures that the airflow back-blowing the bottom of filter element 106 upon entry, cleaning the airflow before it enters the first ventilation frame through the top of filter element 106. When the powder is inside the filter element 106, it is blocked by the airflow. At the same time, the rotation of the filter element 106 further drives the movement of a large amount of accumulated powder. After the hot and humid airflow enters the exhaust pipe 304, it is further separated by the air-water separation component 301 to ensure that the air entering the drying cylinder 1 is dry. When discharging the lithium manganese iron phosphate powder, the high-pressure air pump 3 is controlled to draw outside air into the drying cylinder 1 through the exhaust pipe 304 by opening the cyclone separator 2 and the solenoid valve 305. This causes the powder in the drying cylinder 1 to enter the cyclone separator 2 with the airflow. The cyclone separator 2 separates the powder and air and collects the powder in the discharge hopper 203.

[0032] Among them, such as Figure 1-3 As shown, a feed hopper 102 is welded through the top of one end of the drying cylinder 1. The feed hopper 102 and the filter element 106 are connected through the feed hopper 102. A first ventilation frame 103 is welded through the top of the outer circumference of the drying cylinder 1. The feed hopper 102 and the cyclone separator 2 are located at the other end of the drying cylinder 1 relative to the rotating motor 101. The bottom of the first ventilation frame 103 is attached to the top of the outer circumference of the filter element 106. A heating tube 107 is fixedly fastened inside the second ventilation frame 104. A drain pipe 105 is welded through the bottom of one end of the second ventilation frame 104. A partition 108 is fixedly fastened inside the second ventilation frame 104. Multiple one-way valves 109 are fastened through the top of the partition 108. The partition 108 is located at the bottom of the heating tube 107. The top of the second ventilation frame 104 is attached to the bottom of the outer circumference of the filter element 106.

[0033] A large amount of lithium manganese iron phosphate powder is poured into the filter element 106 through the feed hopper 102. A large amount of residual moisture in the powder falls through the filter element 106 into the second ventilation frame 104 under gravity, and then through the partition 108 and multiple one-way valves 109 to the bottom of the second ventilation frame 104, finally being discharged through the drain pipe 105. During powder drying, a high-pressure air pump 3 draws drying air into the inside of the second ventilation frame 104, and the drying air is heated by the heating pipe 107. The air passes through the bottom of the filter element 106, carrying a large amount of powder with it. The process involves hot air drying of a large amount of powder, which then enters the first ventilation frame 103 through the top of the filter element 106. Simultaneously, the rotating motor 101 drives the filter element 106 to rotate within the drying cylinder 1, continuously adjusting the contact position between the airflow and the filter element 106. This allows the airflow to back-blow the bottom of the filter element 106 as it passes through its inner side, clearing away the powder that gets trapped on the inner wall of the filter element 106 as it enters the first ventilation frame 103. Furthermore, the rotation of the filter element 106 further moves the accumulated powder, improving drying efficiency.

[0034] Among them, such as Figure 1 , 4 As shown, a connecting pipe 201 and an exhaust pipe 202 are welded through to both ends of the outer peripheral surface of the cyclone separator 2, and an exhaust pipe 204 is welded through to the bottom of the discharge hopper 203. One end of the connecting pipe 201 is inserted and snapped into the bottom of one end of the drying cylinder 1. The connecting pipe 201 and the filter element 106 are connected through the filter element 106.

[0035] During discharge, the connecting pipe 201 and solenoid valve 305 are opened, and the high-pressure air pump 3 is used to draw air into the suction pipe 304. The outside air is drawn into the drying cylinder 1 through the suction pipe 304, the air-water separation component 301, the ventilation pipe 302, the high-pressure air pump 3, and the air inlet pipe 303. The powder is carried into the cyclone separator 2 by the airflow. The cyclone separator 2 separates the powder and the airflow. The airflow is discharged through the exhaust pipe 202, and the powder falls into the discharge hopper 203 under the action of gravity. After all the powder in the drying cylinder 1 is discharged, the high-pressure air pump 3 is turned off and the discharge pipe 204 is opened to discharge the powder.

[0036] Among them, such as Figure 1 , 5As shown, a vent pipe 302 is inserted through and clamped to the top of the high-pressure air pump 3. A steam-water separation component 301 is inserted through and clamped to the other end of the vent pipe 302. An exhaust pipe 304 is inserted through and clamped to the top of the steam-water separation component 301. A solenoid valve 305 is inserted through and clamped to one end of the outer circumference of the exhaust pipe 304. One end of the exhaust pipe 304 is inserted through and clamped to one side of the first ventilation frame 103. The vent pipe 302 is located between the solenoid valve 305 and the first ventilation frame 103. An air inlet pipe 303 is inserted through and clamped to one end of the high-pressure air pump 3. The other end of the air inlet pipe 303 is inserted through and clamped to one side of the second ventilation frame 104. The air inlet pipe 303 is located between the heating pipe 107 and the partition 108.

[0037] During the drying process, the solenoid valve 305 is closed, and the high-pressure air pump 3 is controlled to draw air into the extraction pipe 304, so that the hot and humid air in the drying cylinder 1 enters the extraction pipe 304 and is separated into steam and water by the steam-water separation component 301. The dried air is then returned to the drying cylinder 1 through the ventilation pipe 302 and the air inlet pipe 303 to dry the powder again.

[0038] The specific working principle of this utility model is as follows: A large amount of lithium manganese iron phosphate powder is poured into the filter element 106 through the feeding hopper 102. The large amount of residual moisture in the powder falls into the second ventilation frame 104 under the action of gravity through the filter element 106, and then falls to the bottom of the second ventilation frame 104 through the partition 108 and multiple one-way valves 109, and is finally discharged by opening the drain pipe 105. During the drying operation, the solenoid valve 305, the drain pipe 105 and the feeding hopper 102 are closed, and the high-pressure air pump 3 is controlled to draw air into the exhaust pipe 304, so that the hot and humid air in the drying cylinder 1 enters the exhaust pipe 304, and the air and water are separated by the air-water separation component 301. When the dry air enters the inside of the second ventilation frame 104, it is heated by the heating pipe 107. The high-temperature air passes through the bottom of the filter element 106 and moves a large amount of powder, drying the large amount of powder with hot air, and then enters the first ventilation frame 103 through the top of the filter element 106. The rotating motor 101 drives the filter element 106 to rotate inside the drying cylinder 1, continuously adjusting the contact position between the airflow and the filter element 106. When the airflow passes through the inside of the filter element 106, it back-blowing the bottom of the filter element 106, clearing the powder that is blocked on the inner wall of the filter element 106 when the airflow passes through the top of the filter element 106 and enters the first ventilation frame 103. At the same time, the rotation of the filter element 106 further drives the movement of a large amount of accumulated powder. When the lithium manganese iron phosphate powder is dried, the connecting pipe 201 and the solenoid valve 305 are opened, and the high-pressure air pump 3 draws air into the exhaust pipe 304, allowing outside air to be drawn into the drying cylinder 1. The powder is carried by the airflow into the cyclone separator 2, where the powder and airflow are separated. The airflow is discharged through the exhaust pipe 202, and the powder falls into the discharge hopper 203 under gravity. When all the powder in the drying cylinder 1 is discharged, the high-pressure air pump 3 is turned off and the discharge pipe 204 is opened to discharge the powder.

[0039] The above are merely preferred embodiments of the present utility model and do not limit the present utility model. Any modifications, equivalent substitutions, or improvements made to the technical solutions described in the foregoing embodiments, or to some of the technical features, shall fall within the protection scope of the present utility model.

Claims

1. A drying apparatus for preparing lithium manganese iron phosphate by liquid phase method, comprising a drying cylinder (1), a cyclone separator (2), and a high-pressure air pump (3), characterized in that: A rotating motor (101) is fixedly attached to one end of the drying cylinder (1), and a filter element (106) is attached to one end of the rotating motor (101). The filter element (106) is rotatably attached to one end of the drying cylinder (1). A second ventilation frame (104) is welded through the bottom of the outer circumference of the drying cylinder (1). A cyclone separator (2) is provided at one end of the drying cylinder (1). A discharge hopper (203) is attached through the bottom of the cyclone separator (2). A high-pressure air pump (3) is provided on one side of the second ventilation frame (104). A steam-water separation component (301) is provided on the top of the high-pressure air pump (3).

2. The drying apparatus for preparing lithium manganese iron phosphate by liquid phase method according to claim 1, characterized in that: The top of one end of the drying cylinder (1) is welded with a feed hopper (102), which is connected to the filter element (106). The top of the outer circumference of the drying cylinder (1) is welded with a first ventilation frame (103). The feed hopper (102) and the cyclone separator (2) are located at the other end of the drying cylinder (1) relative to the rotating motor (101). The bottom of the first ventilation frame (103) is attached to the top of the outer circumference of the filter element (106).

3. The drying apparatus for preparing lithium manganese iron phosphate by liquid phase method according to claim 1, characterized in that: A heating tube (107) is fixedly connected inside the second ventilation frame (104). A drain pipe (105) is welded through the bottom of one end of the second ventilation frame (104). A partition (108) is fixedly connected inside the second ventilation frame (104). Multiple one-way valves (109) are fixedly connected through the top of the partition (108). The partition (108) is located at the bottom of the heating tube (107). The top of the second ventilation frame (104) is attached to the bottom of the outer peripheral surface of the filter element (106).

4. The drying apparatus for preparing lithium manganese iron phosphate by liquid phase method according to claim 1, characterized in that: The cyclone separator (2) has a connecting pipe (201) and an exhaust pipe (202) welded through both ends of its outer periphery. The discharge hopper (203) has a discharge pipe (204) welded through its bottom. One end of the connecting pipe (201) is inserted and snapped into the bottom of one end of the drying cylinder (1). The connecting pipe (201) and the filter element (106) are connected through the pipe.

5. A drying apparatus for preparing lithium manganese iron phosphate by liquid phase method according to claim 2, characterized in that: The high-pressure air pump (3) is connected to a vent pipe (302) at the top, and a steam-water separation component (301) is connected to the other end of the vent pipe (302). A suction pipe (304) is connected to the top of the steam-water separation component (301). A solenoid valve (305) is connected to one end of the outer circumference of the suction pipe (304). One end of the suction pipe (304) is connected to one side of the first ventilation frame (103). The vent pipe (302) is located between the solenoid valve (305) and the first ventilation frame (103).

6. The drying apparatus for preparing lithium manganese iron phosphate by liquid phase method according to claim 3, characterized in that: One end of the high-pressure air pump (3) is connected to an air inlet pipe (303), and the other end of the air inlet pipe (303) is connected to one side of the second ventilation frame (104). The air inlet pipe (303) is located between the heating pipe (107) and the partition (108).

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