Disc dryer for lithium carbonate production

Abstract

The utility model discloses disc dryer for lithium carbonate preparation relates to lithium carbonate preparation technical field, to solve the disc dryer in prior art only through exhaust pipe to the moisture of drying generation carries out passive discharge, but this kind of mode makes the moisture in the disc dryer internal residence time, and then influence the drying efficiency of lithium carbonate problem. One side of drying tank is connected with filter box, the filter box one side with drying tank one side end face upper end between through the air suction pipe intercommunication, fixedly connected with the air suction fan on the air suction pipe, the filter box is away from the air suction pipe one side end face and fixedly connected with exhaust pipe, through setting air suction fan and filter box, the moisture in drying tank is filtered purification and actively aspirated, compared with traditional passive exhaust mode, the moisture discharge efficiency is improved obviously, and the moisture in the disc dryer is shortened in the residence time, thereby the drying efficiency of lithium carbonate is greatly improved.

Description

Technical Field

[0001] This utility model relates to the field of lithium carbonate preparation technology, specifically to a disc dryer for lithium carbonate preparation. Background Technology

[0002] Battery-grade lithium carbonate is a key raw material for cathode materials in lithium-ion batteries. It exhibits uniform crystal morphology and high chemical stability, and is primarily used to prepare cathode precursors such as lithium iron phosphate and ternary materials. Production involves refining lithium ore or evaporating and crystallizing brine from salt lakes. Multiple purification processes are required to remove impurities such as magnesium and boron. The preparation of lithium carbonate necessitates drying using a dryer.

[0003] For example, authorization announcement number CN221744533U discloses a disc dryer, relating to the technical field of disc dryers. This disc dryer includes a drying tank, with a fixing ring fixedly fitted onto the outer surface of the tank. Three support legs are evenly fixedly connected to the lower surface of the fixing ring. An internal groove is formed inside the top of the drying tank, and a stirring device is installed on the inner wall of the internal groove. Four drying discs are fixedly connected to the inner wall of the drying tank, and a heating device is installed on the outer surface of the drying tank. When the operator uses this disc dryer to dry materials, starting the motor causes the baffle to contact the upper surface of the drying discs, sweeping the material from the upper surface of the drying discs through the discharge ports to the next layer. The discharge ports on the four drying discs are arranged in a crisscross pattern to effectively prevent materials from being directly discharged through the discharge ports during feeding. This device greatly increases the efficiency of material drying.

[0004] However, in the above-mentioned technologies, the moisture generated during drying is passively discharged through the exhaust pipe in the disc dryer. This method results in the moisture remaining inside the dryer for a longer period of time, which in turn affects the drying efficiency of lithium carbonate. Therefore, there is an urgent need in the market to develop a disc dryer for lithium carbonate preparation to help people solve the existing problems. Utility Model Content

[0005] The purpose of this invention is to provide a disc dryer for lithium carbonate preparation, in order to solve the problem mentioned in the background art where the existing disc dryer only passively discharges the moisture generated during drying through the exhaust pipe, but this method results in the moisture staying inside the dryer for a short time, thus affecting the drying efficiency of lithium carbonate.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a disc dryer for lithium carbonate preparation, comprising a drying tank, wherein multiple large-diameter heating discs are fixedly connected vertically at equal intervals inside the drying tank, each large-diameter heating disc has a discharge port in the middle, and each large-diameter heating disc has a small-diameter heating disc at its upper end. A discharge pipe is fixedly connected to the lower end of the discharge port of the bottom large-diameter heating disc, and the lower end of the discharge pipe extends out of the middle of the lower end face of the drying tank. A filter box is connected to one side of the drying tank, and the side of the filter box is connected to the upper end of one side face of the drying tank through a suction pipe. A suction fan is fixedly connected to the suction pipe, and an exhaust pipe is fixedly connected to the side face of the filter box away from the suction pipe.

[0007] Preferably, the side walls of the large-diameter heating plate and the small-diameter heating plate are fixed to the inner wall of the drying tank by support rods. An annular retaining ring is fixedly connected between the upper end of the outer wall of each large-diameter heating plate and the inner wall of the drying tank. A circular through hole is provided in the middle of the small-diameter heating plate. A rotating shaft is rotatably connected to the middle of the inside of the drying tank. The lower end of the rotating shaft passes through the circular through hole of the small-diameter heating plate and extends to the upper middle of the bottom large-diameter heating plate.

[0008] Preferably, rotating rods are fixedly connected to both sides of the rotating shaft and to the upper end of each large-diameter heating plate and small-diameter heating plate, and multiple oblique scrapers are fixedly connected at equal intervals to the lower end of each rotating rod. The oblique scrapers at the upper ends of the large-diameter heating plate and the small-diameter heating plate are arranged in opposite directions.

[0009] Preferably, a feed pipe is fixedly connected to one side of the upper middle part of the drying tank, a drive device is fixedly connected to the upper middle part of the drying tank, and the upper end of the rotating shaft extends out of the upper end of the drying tank and is fixedly connected to the output shaft of the drive device.

[0010] Preferably, the drying tank is provided with a steam inlet pipe and a steam outlet pipe on both sides. The steam inlet pipe is connected to one side of each large-diameter heating plate and each small-diameter heating plate through a first connecting pipe, and the steam outlet pipe is connected to the other side of each large-diameter heating plate and each small-diameter heating plate through a second connecting pipe.

[0011] Preferably, rectangular support frames are provided on both sides of the center of the filter box, and activated carbon packing plate and desiccant packing plate are respectively fixedly installed in the center of the two rectangular support frames.

[0012] Preferably, the front face of the filter box has strip openings on both sides of the middle part. The front ends of the two rectangular support frames extend out of the front face of the filter box through the two strip openings and are fixedly connected to the connecting plates. The two connecting plates are fixedly connected to the front face of the filter box by multiple screws.

[0013] Compared with the prior art, the beneficial effects of this utility model are: (1) In this utility model, by setting up a suction fan and a filter box, the moisture in the drying tank is actively sucked and filtered and purified. Compared with the traditional passive exhaust method, the moisture discharge efficiency is significantly improved and the residence time of moisture in the dryer is shortened, thereby greatly improving the drying efficiency of lithium carbonate.

[0014] (2) In this utility model, a structure with alternating arrangement of large-diameter heating plates and small-diameter heating plates is adopted, and with the oppositely arranged oblique scrapers, the material can achieve alternating flow inside and outside during the drying process, which prolongs the residence time of the material on the heating plate and ensures the uniformity and fullness of drying.

[0015] (3) In this utility model, the filter box adopts a design of detachable activated carbon packing plate and desiccant packing plate. The front ends of the two rectangular support frames extend out of the front end of the filter box through the two strip openings and are fixedly connected to the connecting plates. The two connecting plates are fixedly connected to the front end of the filter box by multiple screws, which makes it easy to pull out the activated carbon packing plate and desiccant packing plate from the strip opening for replacement. Attached Figure Description

[0016] Figure 1 This is a front view of the disc dryer for preparing lithium carbonate according to this utility model. Figure 2 This is a front sectional view of the present invention; Figure 3 This is a side sectional view of the drying tank of this utility model; Figure 4 This is a side sectional view of the filter box of this utility model.

[0017] In the diagram: 1. Drying tank; 101. Steam inlet pipe; 102. First connecting pipe; 103. Steam outlet pipe; 104. Second connecting pipe; 105. Feed pipe; 106. Drive device; 2. Large-diameter heating plate; 201. Annular retaining ring; 202. Material discharge port; 203. Discharge pipe; 3. Small-diameter heating plate; 301. Circular through hole; 4. Rotating shaft; 401. Rotating rod; 402. Angled scraper; 5. Filter box; 501. Suction pipe; 502. Suction fan; 503. Exhaust pipe; 504. Strip opening; 6. Rectangular support frame; 601. Activated carbon packing plate; 602. Desiccant packing plate; 603. Connecting plate; 604. Screw. Detailed Implementation

[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0019] Please see Figure 1-4 This utility model provides an embodiment of a disc dryer for lithium carbonate preparation, comprising a drying tank 1. Multiple large-diameter heating discs 2 are vertically and equally spaced and fixedly connected inside the drying tank 1. Each large-diameter heating disc 2 has a material discharge port 202 in its center and a small-diameter heating disc 3 at its upper end. A steam inlet pipe 101 and a steam outlet pipe 103 are respectively provided on both sides of the drying tank 1. The steam inlet pipe 101 is connected to one side of each large-diameter heating disc 2 and each small-diameter heating disc 3 via a first connecting pipe 102. The steam outlet pipe 103 is connected to the other side of each large-diameter heating disc 2 and each small-diameter heating disc 3 via a second connecting pipe 104. High-temperature steam is delivered to the large-diameter heating discs 2 and small-diameter heating discs 3 through the steam inlet pipe 101 for heating, and discharged through the steam outlet pipe 103. Please see Figure 2 As shown in the figure, a discharge pipe 203 is fixedly connected to the lower end of the material inlet 202 of the large-diameter heating plate 2 at the bottom. The lower end of the discharge pipe 203 extends out of the middle of the lower end face of the drying tank 1. The side walls of the large-diameter heating plate 2 and the small-diameter heating plate 3 are fixed to the inner wall of the drying tank 1 by support rods. An annular retaining ring 201 is fixedly connected between the upper end of the outer wall of each large-diameter heating plate 2 and the inner wall of the drying tank 1. A circular through hole 301 is provided in the middle of the small-diameter heating plate 3. The middle of the drying tank 1 is rotated. A rotating shaft 4 is connected to the bottom of a large-diameter heating plate 2. The lower end of the rotating shaft 4 passes through the circular through-hole 301 of the small-diameter heating plate 3 and extends to the upper middle part of the bottom large-diameter heating plate 2. Rotating rods 401 are fixedly connected to both sides of the rotating shaft 4 and to the upper end of each large-diameter heating plate 2 and small-diameter heating plate 3. Multiple inclined scrapers 402 are fixedly connected at equal intervals to the lower end of each rotating rod 401. The inclined scrapers at the upper ends of the large-diameter heating plate 2 and small-diameter heating plate 3 are... 402 is arranged in reverse. A feed pipe 105 is fixedly connected to one side of the upper middle part of the drying tank 1. A drive device 106 is fixedly connected to the upper middle part of the drying tank 1. The upper end of the rotating shaft 4 extends out of the upper end of the drying tank 1 and is fixedly connected to the output shaft of the drive device 106. The raw material enters the interior of the drying tank 1 from the feed pipe 105 and falls onto the uppermost small-diameter heating plate 3. The rotating shaft 4 drives multiple rotating rods 401 and their lower end rotating oblique scrapers 402 to rotate. When the oblique scraper 402 at the upper end of the small-diameter heating plate 3 rotates, it gradually pushes the raw material outward and falls onto the large-diameter heating plate 2. When the oblique scraper 402 at the upper end of the large-diameter heating plate 2 rotates, it gradually pushes the raw material inward and falls again onto the small-diameter heating plate 3 at its front end through the discharge port 202. The raw material is dried as it gradually falls onto the large-diameter heating plate 2 and the small-diameter heating plate 3. Finally, it is discharged through the discharge pipe 203 at the lower end of the large-diameter heating plate 2.

[0020] Please see Figure 2 and Figure 4A filter box 5 is connected to one side of the drying tank 1. The filter box 5 is connected to the upper end of one side of the drying tank 1 through a suction pipe 501. A suction fan 502 is fixedly connected to the suction pipe 501. The suction fan 502 draws moisture from the upper part of the drying tank 1 through the suction pipe 501. Air enters the drying tank 1 through the discharge pipe 203, so that the moisture inside the drying tank 1 is transported to the filter box 5 through the suction pipe 501.

[0021] Please see Figure 2 and Figure 4 An exhaust pipe 503 is fixedly connected to the end face of the filter box 5 away from the intake pipe 501. Rectangular support frames 6 are provided on both sides of the middle part of the filter box 5. Activated carbon packing plate 601 and desiccant packing plate 602 are fixedly installed in the middle part of the two rectangular support frames 6, respectively. Strip openings 504 are provided on both sides of the middle part of the front face of the filter box 5. The front ends of the two rectangular support frames 6 extend out of the front face of the filter box 5 through the two strip openings 504, and are fixedly connected to connecting plates 603. The two connecting plates 603 are fixedly connected to the front face of the filter box 5 by multiple screws 604. After being purified by the activated carbon packing plate 601 and desiccant packing plate 602 in the filter box 5, the moisture is discharged from the exhaust pipe 503.

[0022] Working Principle: During operation, lithium carbonate raw material is added to the drying tank 1 through the feed pipe 105. The material first falls onto the uppermost small-diameter heating plate 3. The drive device 106 drives the rotating shaft 4 to rotate, thereby causing the rotating rods 401 and the inclined scrapers 402 of each layer to rotate synchronously. On the small-diameter heating plate 3, the opposing inclined scrapers 402 push the material outwards to the edge and then it falls onto the lower large-diameter heating plate 2. The annular baffle 201 seals the space between the large-diameter heating plate 2 and the inner wall of the drying tank 1. On the large-diameter heating plate 2, the forward-facing inclined scrapers 402 push the material towards the central discharge port 202, achieving a stepped descent of the material between the alternating large and small heating plates. During this process, steam enters the inner cavity of each heating plate through the steam inlet pipe 101 and the first connecting pipe 102 for heating, and condensate is discharged from the steam outlet pipe 103 through the second connecting pipe 104. Simultaneously, the suction fan 502 actively draws in moisture from the top of the drying tank 1 through the suction pipe 501, allowing external air to enter through the discharge pipe 203 to form an airflow circulation. The moisture is purified by the activated carbon packing plate 601 and the desiccant packing plate 602 inside the filter box 5 before being discharged through the exhaust pipe 503. Finally, the dried material is output from the bottom discharge pipe 203. This design significantly improves the moisture removal efficiency through the forced ventilation system, and the multi-layer staggered heating plate structure ensures thorough drying of the material. It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A disc dryer for lithium carbonate preparation, comprising a drying tank (1), characterized in that: The drying tank (1) is vertically and equally spaced with multiple large-diameter heating plates (2). Each large-diameter heating plate (2) has a material discharge port (202) in the middle. Each large-diameter heating plate (2) has a small-diameter heating plate (3) at the top. The bottom end of the material discharge port (202) of the large-diameter heating plate (2) is fixedly connected to a discharge pipe (203). The bottom end of the discharge pipe (203) extends out of the middle of the lower end face of the drying tank (1). A filter box (5) is connected to one side of the drying tank (1). The filter box (5) is connected to the upper end of one side face of the drying tank (1) through a suction pipe (501). A suction fan (502) is fixedly connected to the suction pipe (501). An exhaust pipe (503) is fixedly connected to the side face of the filter box (5) away from the suction pipe (501).

2. The disc dryer for lithium carbonate preparation according to claim 1, characterized in that: The side walls of the large-diameter heating plate (2) and the small-diameter heating plate (3) are fixed to the inner wall of the drying tank (1) by support rods. An annular retaining ring (201) is fixedly connected between the upper end of the outer wall of each large-diameter heating plate (2) and the inner wall of the drying tank (1). A circular through hole (301) is provided in the middle of the small-diameter heating plate (3). A rotating shaft (4) is rotatably connected in the middle of the interior of the drying tank (1). The lower end of the rotating shaft (4) passes through the circular through hole (301) of the small-diameter heating plate (3) and extends to the upper middle part of the bottom large-diameter heating plate (2).

3. The disc dryer for lithium carbonate preparation according to claim 2, characterized in that: Rotating rods (401) are fixedly connected to both sides of the rotating shaft (4) and to the upper end of each large-diameter heating plate (2) and small-diameter heating plate (3). Multiple oblique scrapers (402) are fixedly connected at equal intervals to the lower end of each rotating rod (401). The oblique scrapers (402) at the upper end of the large-diameter heating plate (2) and small-diameter heating plate (3) are arranged in opposite directions.

4. The disc dryer for lithium carbonate preparation according to claim 3, characterized in that: A feed pipe (105) is fixedly connected to one side of the upper middle part of the drying tank (1), and a drive device (106) is fixedly connected to the upper middle part of the drying tank (1). The upper end of the rotating shaft (4) extends out of the upper end of the drying tank (1) and is fixedly connected to the output shaft of the drive device (106).

5. The disc dryer for lithium carbonate preparation according to claim 1, characterized in that: The drying tank (1) is provided with a steam inlet pipe (101) and a steam outlet pipe (103) on both sides respectively. The steam inlet pipe (101) is connected to one side of each large-diameter heating plate (2) and each small-diameter heating plate (3) through a first connecting pipe (102). The steam outlet pipe (103) is connected to the other side of each large-diameter heating plate (2) and each small-diameter heating plate (3) through a second connecting pipe (104).

6. The disc dryer for lithium carbonate preparation according to claim 1, characterized in that: The filter box (5) has rectangular support frames (6) on both sides of the middle part. The two rectangular support frames (6) are respectively fixedly installed with activated carbon packing plate (601) and desiccant packing plate (602) in the middle part of the two rectangular support frames (6).

7. The disc dryer for lithium carbonate preparation according to claim 6, characterized in that: The filter box (5) has strip openings (504) on both sides of the middle part of the front face. The front ends of the two rectangular support frames (6) extend out of the front face of the filter box (5) through the two strip openings (504) and are fixedly connected to the connecting plates (603). The two connecting plates (603) are fixedly connected to the front face of the filter box (5) by multiple screws (604).

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