Slurry mixing device

Abstract

The utility model provides a slurry mixing device. The slurry mixing device comprises a tank body, a stirrer and a disperser, wherein the stirrer and the disperser are arranged in the tank body; the number of the dispersers is at least two, and the at least two dispersers are uniformly distributed around the circumferential direction of a stirring shaft of the stirrer; each disperser comprises a first motor, a rotating shaft and at least two dispersing discs arranged on the rotating shaft, the first motor drives the rotating shaft to rotate, the at least two dispersing discs are sequentially arranged in the axial direction of the rotating shaft, and the diameters of the dispersing discs on each disperser are sequentially reduced in the direction away from the first motor; through the cooperation of the stirrer and the dispersers, the stirrer is responsible for pushing materials and mixing the bottom layer, and the dispersers are uniformly distributed around the stirrer and cover the total radial section in the tank body as much as possible, so that the stirring dead angles are reduced; meanwhile, the shearing effect is improved by arranging the multiple dispersing discs, and the dispersed materials flow from top to bottom and are subjected to multiple times of shearing and dispersing.

Description

Technical Field

[0001] This utility model relates to a slurry mixing device. Background Technology

[0002] In the production of lithium battery materials, the uniform mixing of lithium iron phosphate slurry is a critical process. Existing mixing equipment has the following problems when processing high-viscosity slurries (viscosity ≥ 5000 mPa·s): traditional anchor-type stirring paddles are prone to generating turbulence blind zones when the viscosity is > 2000 mPa·s, resulting in local mixing dead zones; a single stirring method cannot meet the dispersion requirements of multi-scale particles and is prone to agglomeration. Utility Model Content

[0003] The technical problem to be solved by this utility model is to overcome the defects of low mixing efficiency and poor dispersion effect of existing slurry (especially high viscosity slurry) mixing devices, and to provide a slurry mixing device that can achieve good dispersion effect on materials with high viscosity.

[0004] The present invention solves the above-mentioned technical problems through the following technical solution:

[0005] This utility model provides a slurry mixing device, which includes a tank, an agitator and a disperser disposed in the tank; there are at least two dispersers, and the at least two dispersers are evenly distributed around the stirring shaft of the agitator.

[0006] Each of the dispersers includes a first motor, a rotating shaft, and at least two dispersing discs disposed on the rotating shaft. The first motor drives the rotating shaft to rotate, and the at least two dispersing discs are arranged sequentially along the axial direction of the rotating shaft. The diameter of the dispersing discs on each disperser decreases sequentially in the direction away from the first motor.

[0007] The combination of the agitator and disperser in this invention allows the agitator to push the material and mix the bottom layer, while the disperser is evenly distributed around the agitator, covering as much of the radial cross-section of the tank as possible to reduce dead zones. Simultaneously, multiple dispersing discs enhance the shearing effect, as the material flowing from top to bottom undergoes multiple shearing and dispersion processes. Generally, higher disperser speeds can exacerbate device swaying; however, this invention further improves the stability of the disperser and prevents swaying by setting the diameter of the dispersing discs to decrease from top to bottom.

[0008] In this invention, preferably, the dispersing disc includes a disc surface and a plurality of dispersing teeth arranged around the outer peripheral surface of the disc surface. The dispersing teeth include a first portion coplanar with the disc surface and a second portion perpendicular to the disc surface; the bending directions of the second portions of adjacent dispersing teeth are opposite.

[0009] Preferably, the second part includes an inclined surface perpendicular to the disk surface, the inclined surface having an inclination angle of 45-60°, where the inclination angle refers to the angle between the inclined surface and the tangent to the disk surface. This preferred inclination angle allows for a better balance between the contact area between the dispersing teeth and the material and the stirring resistance, thereby achieving a better mixing effect.

[0010] Preferably, the tooth pitch of the dispersing tooth is 10-30 mm, where the tooth pitch refers to the distance from the root to the tip of the tooth in the first part of the dispersing tooth. This preferred tooth pitch range effectively avoids or reduces deformation of the dispersing tooth while achieving a better dispersing effect.

[0011] The spacing between the tooth roots of the first part of the adjacent dispersing teeth is preferably 2-5 mm. This preferred spacing can better balance the dispersing effect and the material extrusion and collision effect.

[0012] In this invention, each disperser preferably contains 2 to 4 dispersing discs, for example, 3, to further increase the axial flow of the slurry while minimizing turbulence.

[0013] In this invention, the number of dispersers is preferably 2 to 4, for example 3.

[0014] In this invention, the slurry mixing device preferably further includes a propeller, and the propeller and at least two dispersers are evenly distributed circumferentially around the stirring shaft of the agitator to further enhance the vertical flowability of the material.

[0015] The propeller includes a motor, a shaft, and helical blades mounted on the shaft. Preferably, the diameter of the helical blades is the same as the maximum diameter of the dispersing disk.

[0016] Preferably, the number of propellers may be one. In some embodiments, there is one propeller and two dispersers, with one propeller and two dispersers evenly distributed around the stirring shaft of the agitator.

[0017] Preferably, the pitch of the propeller blades is 25~35mm.

[0018] Preferably, the helix angle of the propeller blades is 45~60°.

[0019] Preferably, when the agitator is an anchor agitator, the highest point of the spiral blade is level with the highest point of the paddle of the anchor agitator, and the lowest point of the spiral blade is 20-30 cm higher than the bottom of the paddle of the anchor agitator.

[0020] In this invention, the ratio of the diameter of the dispersing disc to the inner diameter of the tank is preferably (0.05~0.16):1. If the diameter of the dispersing disc is too large, the resistance during dispersion will increase, and the stability of the disperser's shaft will deteriorate. If the diameter of the dispersing disc is too small, the dispersion effect will deteriorate. This preferred range can better balance the shaft stability and the dispersion effect.

[0021] In this invention, the diameter of the dispersing disc is preferably 200-700 mm, and more preferably, the diameter of adjacent dispersing discs in each disperser differs by 150-250 mm, for example, 200 mm.

[0022] In this invention, the thickness of the dispersing disc is preferably 3-5 mm.

[0023] In this invention, the spacing between adjacent dispersing discs in each disperser is preferably 150-250 mm, for example, 200 mm.

[0024] In this invention, the agitator is preferably an anchor-type agitator, which is conventional in the art and generally includes a second motor, a reducer, a stirring shaft, and impellers. The impellers have an anchor-type structure, and the disperser is located within the impellers. By employing an anchor-type agitator, the agitator impellers are located at the bottom of the tank, responsible for material pushing and bottom mixing. The disperser is located within the impellers, forming a synergistic flow field of "downward pushing + upward shearing," increasing axial flow.

[0025] The disperser's shaft is preferably located at the center of the agitator's shaft and blades, allowing for more thorough material contact.

[0026] Preferably, the number of blades is 2 to 4, and the blades are symmetrically distributed around the stirring shaft to further balance the axial force.

[0027] Preferably, the ratio of the maximum diameter of the impeller blade of the agitator to the inner diameter of the tank is (0.8~0.95):1.

[0028] Preferably, the height of the blade is 0.45 to 0.65 of the internal height of the tank.

[0029] In each of the dispersers, a portion of the dispersing disc is located above the paddle, while the remaining portion is located inside the paddle, further improving the uniformity of material mixing.

[0030] The thickness of the blade is preferably 8-15 mm.

[0031] In this invention, the ratio of the inner diameter to the inner height of the tank is preferably 1:(1~2). This shortens the length of the disperser's rotating shaft and the agitator's stirring shaft, reducing their swaying under stress and thus improving stability. In this invention, the inner diameter refers to the diameter.

[0032] In this invention, the volume of the tank can be 40 cubic meters.

[0033] The positive and progressive effects of this utility model are as follows:

[0034] The combination of the agitator and disperser in this invention allows the agitator to push the material and mix the bottom layer, while the disperser is evenly distributed around the agitator, covering as much of the radial cross-section of the tank as possible to reduce dead zones. Simultaneously, the use of multiple dispersing discs enhances the shearing effect, ensuring the material undergoes multiple shearing and dispersion processes as it flows downwards. Furthermore, by setting the diameter of the dispersing discs to decrease from top to bottom, the stability of the disperser is further improved, preventing shaking. Attached Figure Description

[0035] Figure 1 This is a schematic diagram of the slurry mixing device described in the embodiment of this utility model.

[0036] Figure 2 This is a schematic diagram of the structure of the dispersion disc described in an embodiment of this utility model.

[0037] Explanation of reference numerals in the attached figures:

[0038] 1-Tank body; 2-Agitator; 3-Disperser;

[0039] 201-Second motor, 202-Reducer, 203-Agitator shaft, 204-Impeller blade;

[0040] 301 - First motor; 302 - Rotating shaft; 303 - Dispersion disc; 3031 - Dispersion teeth;

[0041] 30311 - Part 1, 30112 - Part 2. Detailed Implementation

[0042] The present invention will be described more clearly and completely below with reference to the accompanying drawings, using a preferred embodiment as an example.

[0043] Example 1

[0044] This embodiment discloses a slurry mixing device, such as... Figure 1 and Figure 2 As shown, it includes a tank 1, an agitator 2, a disperser 3 and a propeller disposed in the tank 1.

[0045] Tank 1 includes a shell and an upper head, which are connected by a flange. The upper head is provided with mounting holes for agitator 2 and disperser 3. The agitator shaft 203 of agitator 2 is mechanically sealed, and the ratio of its inner diameter to its inner height is 1:(1~2).

[0046] The agitator 2 is an anchor-type agitator, comprising a second motor 201, a reducer 202, an agitator shaft 203, and impellers 204. The agitator shaft 203 is connected to the output shaft of the reducer 202 via a coupling. The second motor 201 drives the agitator shaft 203 to rotate. The second motor 201 and the reducer 202 are located outside the upper end cap. The impellers 204 have an anchor-type structure, with the ratio of the maximum diameter of the impeller 204 to the inner diameter of the tank body being (0.8~0.95):1. There are 2~4 impellers 204, symmetrically distributed around the agitator shaft 203. The height of the impellers 204 is 0.45~0.65 of the internal height of the tank body 1, and the thickness of the impellers 204 is 8~15mm.

[0047] The disperser 3 includes a first motor 301, a rotating shaft 302, and a dispersing disk 303 disposed on the rotating shaft 302. The first motor 301 drives the rotating shaft 302 to rotate. The rotating shaft 302 is parallel to the stirring shaft 203. The first motor 301 is disposed outside the upper end cap. The propeller includes a motor, a rotating shaft, and helical blades disposed on the rotating shaft. The rotating shaft of the propeller is also parallel to the stirring shaft 203.

[0048] There are two dispersers 3 and one propeller, and the two dispersers 3 and one propeller are distributed circumferentially around the stirring shaft 203. The rotating shaft 302 of each disperser 3 and the rotating shaft of the propeller are located at the center of the stirring shaft 203 and the blade 204.

[0049] Each disperser 3 is provided with three dispersing discs 303, which are arranged sequentially along the axial direction of the disperser 3. The diameters of the three dispersing discs 303 decrease sequentially in the direction away from the first motor 301 in the disperser 3. In this embodiment, the diameters of the three dispersing discs 303 from top to bottom are 700mm, 500mm, and 300mm, respectively. The spacing between adjacent dispersing discs 303 is 200mm, and the thickness of each dispersing disc is 3~5mm. In each disperser 3, the dispersing disc 303 closest to the first motor 301 (i.e., the dispersing disc with the largest diameter) is higher than the impeller 204 of the stirrer 2, and the other two dispersing discs 303 are located inside the impeller 204. The ratio of the diameter of the dispersing disc 303 to the inner diameter of the tank 1 is (0.05~0.16):1.

[0050] The dispersion disk 303 includes a disk surface and a plurality of dispersion teeth 3031 arranged sequentially around the outer peripheral surface of the disk surface. Each dispersion tooth 3031 includes a first portion 30311 coplanar with the disk surface and a second portion 30312 perpendicular to the disk surface. The bending directions of the second portions 30312 of adjacent dispersion teeth 3031 are opposite. The second portion 30312 includes an inclined surface perpendicular to the disk surface, with an inclination angle α of 45~60°. The tooth pitch length A of the second portion 30312 of the dispersion teeth 3031 is 10~30mm, and the distance B between the tooth roots of adjacent second portions 30312 of the dispersion teeth 3031 is 2~5mm.

[0051] The diameter of the helical blade is the same as the maximum diameter of the dispersion disk 303, that is, the diameter of the helical blade is 700 mm, the pitch of the helical blade is 25~35 mm, the helical angle of the helical blade is 45~60°, the highest point of the helical blade is level with the highest point of the blade 204, and the lowest point of the helical blade is 20~30 cm higher than the bottom of the blade 204.

[0052] Comparative Example 1

[0053] The slurry mixing device in this comparative example is basically the same as that in Example 1, except that the disperser 3 is not provided in the slurry mixing device in this comparative example.

[0054] Effect Example

[0055] The mixture consists of 150.8g of ferric phosphate, 73.9g of lithium carbonate, 22.5g of sucrose, and 164.8g of deionized water, with a solid content of 60%.

[0056] Start stirrer 2 at 8 rpm, add water and sucrose in sequence, stir for 10 minutes, then add ferric phosphate and lithium carbonate. Start disperser 3 at 15 rpm, maintain temperature at 75±2℃ and stir for 2 hours. After cooling to 40℃, discharge the material.

[0057] Tests showed that the slurry mixing device of Example 1 performed well at a speed of 40m. 3 In the slurry treatment, the time required to achieve 95% uniformity is 45 minutes. The D50 particle size of the mixed slurry is 8μm, and the PDI index is 0.2~0.3.

[0058] The slurry mixing device of Comparative Example 1 is at 40m 3 In the slurry treatment, the time required to achieve 95% uniformity is 120 minutes. The D50 particle size of the mixed slurry is 18μm, and the PDI index is 0.2~0.3.

Claims

1. A slurry mixing device, characterized in that, It includes a tank, an agitator and a disperser disposed in the tank; there are at least two dispersers, and the at least two dispersers are evenly distributed circumferentially around the agitator shaft of the agitator; Each of the dispersers includes a first motor, a rotating shaft, and at least two dispersing discs disposed on the rotating shaft. The first motor drives the rotating shaft to rotate, and the at least two dispersing discs are arranged sequentially along the axial direction of the rotating shaft. The diameter of the dispersing discs on each disperser decreases sequentially in the direction away from the first motor.

2. The slurry mixing device as described in claim 1, characterized in that, The dispersion disk includes a disk surface and a plurality of dispersion teeth arranged around the outer peripheral surface of the disk surface. The dispersion teeth include a first portion coplanar with the disk surface and a second portion perpendicular to the disk surface; the bending directions of the second portions of adjacent dispersion teeth are opposite.

3. The slurry mixing device as described in claim 2, characterized in that, The second part includes an inclined surface perpendicular to the disk surface, the inclined surface having an inclination angle of 45~60°, the inclination angle being the angle between the inclined surface and the tangent of the disk surface; And / or, the tooth pitch length of the dispersing tooth is 10~30mm, and the tooth pitch refers to the distance from the root to the tip of the tooth in the first part of the dispersing tooth; And / or, the spacing between the roots of the first portion of adjacent dispersed teeth is 2~5mm.

4. The slurry mixing device as described in claim 1, characterized in that, The number of dispersers is 2 to 4; And / or, in each of the dispersers, the number of the dispersing discs is 2 to 4.

5. The slurry mixing device as described in claim 1, characterized in that, The slurry mixing device further includes a propeller, which, along with at least two dispersers, is circumferentially distributed around the mixing shaft of the agitator.

6. The slurry mixing apparatus as described in claim 5, characterized in that, The pitch of the propeller blades is 25~35mm; And / or, the helix angle of the propeller blades is 45~60°.

7. The slurry mixing apparatus as described in claim 1, characterized in that, The ratio of the diameter of the dispersion disc to the inner diameter of the tank is (0.05~0.16):1; And / or, the ratio of the inner diameter of the tank to the internal height of the tank is 1:(1~2).

8. The slurry mixing apparatus as described in claim 1 or 5, characterized in that, The diameter of the dispersing disc is 200~700mm, and the diameter of adjacent dispersing discs in each disperser differs by 150~250mm. And / or, in each of the dispersers, the spacing between adjacent disperser discs is 150~250mm; And / or, the thickness of the dispersion disk is 3~5mm.

9. The slurry mixing apparatus as described in claim 1, characterized in that, The agitator includes a second motor, a reducer, a stirring shaft, and blades, wherein the blades have an anchor-type structure, and the disperser is located inside the blades.

10. The slurry mixing apparatus as described in claim 9, characterized in that, The ratio of the maximum diameter of the impeller blades of the agitator to the inner diameter of the tank is (0.8~0.95):1; And / or, the height of the paddle is 0.45 to 0.65 of the internal height of the tank; And / or, the thickness of the blade is 8~15mm; And / or, the number of blades is 2 to 4, and the blades are evenly distributed around the stirring shaft; And / or, the shaft of the disperser is located at the center of the mixing shaft and the blades of the agitator; And / or, in each of the dispersers, a portion of the dispersion disk is located above the blade, and the remaining portion of the dispersion disk is located inside the blade.

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