A solid-liquid mixing device and a mixing method using the same

Abstract

The present invention provides a solid-liquid mixing device and a mixing method using the device. The solid-liquid mixing device includes a liquid distribution module, a powder dispersion module, a solid-liquid mixing module and a discharge module. The liquid distribution module conveys the liquid to be mixed to the mixing module. The powder dispersion module is used to disperse and / or crush the powder to be mixed and then enter the solid-liquid mixing module. The liquid to be mixed and the powder to be mixed are mixed and rapidly rotated in the solid-liquid mixing module and then discharged by the discharge module. In the present invention, in the powder dispersion module, the powder to be mixed is initially broken up and then contacted with the liquid to be mixed at a specific inclination angle for initial rapid wetting. Screw feeding is used, and no separate valve control is required, which has a stronger dispersion ability. In the mixing module, the rapidly rotating agitator accelerates the wetting process of the powder and the liquid. In the discharge module, high-viscosity slurry can be discharged and a vacuum is generated at the same time.

Description

Technical Field

[0001] The invention relates to the field of powder slurrying, solid-liquid mixing or rapid dispersion of nanometer powder materials, and in particular to a solid-liquid mixing device and a mixing method using the device. Background Art

[0002] The basic process of dispersing solid powder in liquid can be divided into: (1) Wetting of powder: replacing the air attached to the powder with a liquid medium. In order for a powder to be dispersed in a liquid, it must first be wetted. The wettability of the solid surface is determined by its chemical composition and microstructure. (2) Rupture and dispersion of particle agglomerates, and breaking up agglomerates: There are three main forces: extrusion, impact and shear. This dispersion step must be assisted by mechanical equipment. The magnitude and proportion of the above three forces are different for different equipment. (3) Stabilization of the suspended dispersion. In order to prevent the already dispersed particles from agglomerating, the dispersion stabilization effects include electrostatic stabilization and steric hindrance stabilization.

[0003] All powder dispersion processes are based on the above basic process. At present, the first step of powder wetting is the starting point of all dispersion processes, and its role is very important. If the first step of wetting is effective, the subsequent dispersion force or energy consumption will be low, the coarse particles will be reduced, and the slurry will be more stable.

[0004] At present, the first step (wetting) and the third step (stabilization) can be optimized by additives such as wetting dispersants. Since wetting additives can have an adverse effect on subsequent processes or products, such as the pulping process in the lithium battery industry, the additives used must not damage the electrical properties, which greatly limits the selection range of wetting additives. This is a neglected area in the current lithium battery pulping process. How to use mechanical energy to accelerate the wetting of the powder surface, avoid the use of wetting additives, and use physical and mechanical methods to accelerate the wetting of the powder surface is an urgent problem to be solved in the industry.

[0005] In addition, with the development of nanomaterials and ultrafine powders, due to their large specific surface area and the large amount of gas adsorbed on the surface, these ultrafine powder materials are difficult to infiltrate in liquids and difficult to mix with liquids, resulting in slow dispersion of powders in liquids, high energy consumption and poor efficiency. Traditional equipment only has a single structure and function and cannot adapt to the widely different material properties of powders and liquids. Summary of the invention

[0006] The present invention provides a solid-liquid mixing device and a mixing method using the device, which can overcome the current difficulty in wetting materials with large surface areas, and designs a device combination of different functional modules to accelerate the wetting of the powder surface and fully mix it with the liquid.

[0007] To achieve the above object, the present invention adopts the following technical solutions:

[0008] A solid-liquid mixing device comprises a liquid distribution module, a powder dispersion module, a solid-liquid mixing module and a discharge module. The liquid distribution module conveys the liquid to be mixed to the mixing module. The powder dispersion module is used to disperse and / or crush the powder to be mixed before entering the solid-liquid mixing module. The liquid to be mixed and the powder to be mixed are mixed and rapidly rotated in the solid-liquid mixing module and then discharged by the discharge module.

[0009] The above-mentioned liquid dispersion module conveys the liquid to the annular slit through one or more pumps and a liquid feed pipe corresponding to the pump, so that the liquid passes through the annular slit and then flows vertically downward.

[0010] The above-mentioned powder dispersion module is an impact-type powder dispersion and crushing device.

[0011] The powder dispersion module comprises a powder dispersion chamber and a spiral cone impact module arranged therein, wherein the spiral cone impact module comprises a cone body and a cutting blade arranged on the surface of the cone body and spirally upward.

[0012] The above-mentioned powder dispersion module includes a powder dispersion chamber and a conical impact module arranged therein, wherein the conical impact module includes a conical body, a surface of the conical body is provided with a cemented carbide coating or a ceramic coating, and a groove is provided on the conical body.

[0013] The powder dispersion module comprises a powder dispersion chamber and a rod-pin type impact module arranged therein, wherein the rod-pin type impact module comprises a conical body and a group of stirring rods arranged on the surface of the conical body.

[0014] The above-mentioned powder dispersion module includes a powder dispersion chamber and a wing-type impact module arranged therein, the wing-type impact module includes a conical body and a group of impact components arranged on the surface of the conical body, the impact component includes a connecting rod and an impact block, one end of the connecting rod is connected to the surface of the conical body, and the other end is connected to the impact block.

[0015] The above-mentioned powder dispersing module further includes a powder discharge structure that can make the powder collide with the vertically downward liquid at a certain inclination angle to make the powder initially wet.

[0016] The powder discharge structure is arranged between the powder dispersing and pulverizing device and the mixing module, and is formed into a disc-shaped component with grooves cut on its circumference.

[0017] At least one side wall of the groove is inclined relative to the center line of the disc body.

[0018] The solid-liquid mixing module comprises a mixing container and a stirrer arranged in the mixing container for mixing the liquid to be mixed with the powder to be mixed and rotating rapidly.

[0019] The outer surface of the powder dispersing chamber and the inner surface of the mixing container form an annular slit.

[0020] The above-mentioned stirrer includes a stirrer body and blades arranged on the circumference of the body.

[0021] The blades are uprightly arranged on the circumference of the body.

[0022] The blades are arranged obliquely on the circumference of the body.

[0023] The above-mentioned stirrer comprises a container with openings at both ends and a horizontal plate arranged in the middle of the container. The surface of the container is provided with leakage holes, and the horizontal plate is provided with through grooves.

[0024] The above-mentioned discharge module comprises a discharge container and a dispersing impeller arranged in the discharge container, and a discharge pipe is arranged on the side wall of the discharge container.

[0025] The above-mentioned discharge pipeline is provided with a pump for adjusting the flow rate of the discharged slurry.

[0026] The above-mentioned dispersion impeller comprises a disc body and blades respectively arranged on the upper and lower surfaces of the disc body and perpendicular to the upper and lower surfaces of the disc.

[0027] The above-mentioned dispersing impeller is formed in the shape of a fan blade, and includes a central connecting block and a fan blade formed integrally with the connecting block. At least one side of the fan blade and at least one side of the upper and lower sides are provided with a stirring bar.

[0028] A mixing method using the above-mentioned solid-liquid mixing equipment, step one, firstly transporting the liquid to be mixed to the mixing module through the liquid distribution module; step two, after the powder to be mixed is dispersed and / or crushed by the powder dispersion module, it collides with the vertically downward liquid to be mixed at a certain inclination angle to make the powder initially wet; step three, the initially wetted powder and the liquid to be mixed enter the solid-liquid mixing module together for mixing and rapid rotation, and then enter the discharge module; step four, the solid-liquid mixed slurry after the initial mixing is further dispersed therein and then discharged.

[0029] In the mixing method of the solid-liquid mixing equipment, in step 1, the liquid to be mixed is first transported to the annular slit by the combined action of a pump and a liquid feed pipe, so that the liquid passes through the annular slit and then moves vertically downward at a certain speed.

[0030] In the mixing method of the solid-liquid mixing equipment described above, in step 1, the total cross-sectional area of ​​the liquid feed pipe must be greater than or equal to the flow area of ​​the slit.

[0031] In the mixing method of the solid-liquid mixing equipment described above, in step four, the discharge speed of the slurry is adjusted to be greater than or equal to the feed speed of the liquid to be mixed in step one by adjusting the pump on the discharge pipeline.

[0032] After adopting the above technical solution, through this technical solution, the powder to be mixed is first preliminarily broken up, and then contacts the liquid to be mixed at a specific inclination angle for preliminary rapid wetting. In the powder dispersion module, it adopts spiral feeding without valve control, which has stronger stirring force. At the same time, in the mixing module, the agitator is rotated quickly to speed up the wetting process of the powder and liquid. Finally, in the discharge module, the impeller for discharging liquid generates vacuum, which can discharge high-viscosity slurry and generate vacuum at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 This is a schematic diagram of the structure of Embodiment 1 of the present invention;

[0034] Figure 2 for Figure 1 A partial enlarged view of

[0035] Figure 3 It is a three-dimensional schematic diagram of the first embodiment of the present invention;

[0036] Figure 4 It is a three-dimensional schematic diagram of the first embodiment of the powder discharge structure;

[0037] Figure 4A for Figure 4 A partial enlarged view of

[0038] Figure 5 It is a plan view of the first embodiment of the powder discharge structure;

[0039] Figure 5A for Figure 5 A partial enlarged view of

[0040] Figure 6 This is a schematic structural diagram of an agitator according to an embodiment of the present invention;

[0041] Figure 7 This is a schematic structural diagram of a dispersion impeller according to Embodiment 1 of the present invention;

[0042] Figure 8 It is a three-dimensional schematic diagram of the third embodiment of the present invention;

[0043] Fig. 9 It is a plan view of the third embodiment of the present invention;

[0044] Fig.10 This is a schematic structural diagram of an agitator according to Embodiment 3 of the present invention;

[0045] Fig.11 It is a three-dimensional schematic diagram of the fourth embodiment of the present invention;

[0046] Fig.12 It is a plan view of a fourth embodiment of the present invention;

[0047] Fig.13 This is a schematic structural diagram of an agitator according to a fourth embodiment of the present invention;

[0048] Fig.14 This is a schematic structural diagram of a conical impact module according to a fifth embodiment of the present invention;

[0049] Fig.15 This is a schematic structural diagram of a pin-type impact module according to a sixth embodiment of the present invention;

[0050] Fig.16 This is a schematic diagram of the structure of a seven-wing impact module according to an embodiment of the present invention;

[0051] Fig.17 This is a schematic diagram of the structure of the dispersion impeller of Embodiment 8 of the present invention;

[0052] Fig.17A for Fig.17 A partial enlarged view of . DETAILED DESCRIPTION

[0053] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0054] Embodiment 1:

[0055] refer to Figure 1 , 2 , 3, which discloses a solid-liquid mixing device, including a powder dispersion module 1, a liquid distribution module 2, a solid-liquid mixing module 3 and a discharge module 4, wherein:

[0056] In this embodiment, the powder dispersion module 1 is an impact-type powder dispersion and pulverization device, which includes a powder dispersion chamber 11, a spiral cone impact module 12 disposed therein, and a powder discharge structure 13, wherein:

[0057] The powder dispersing chamber 11 is formed into a barrel shape with openings at the top and the bottom. A retaining wall 111 is provided in the middle of the outer wall of the chamber 11 and a positioning hole 112 is provided in the retaining wall 111 .

[0058] The spiral cone impact module 12 includes a cone body 121 and a cutting blade 122 arranged on the surface of the cone body and spirally upward. This structural arrangement can increase the contact opportunity or collision probability between the powder and the spiral cone impact module 12, thereby achieving a better dispersion effect.

[0059] refer to Figure 4 , 4A As shown in , 5 and 5A, the powder discharge structure 13 is arranged below the spiral cone impact module 12, which can make the powder collide with the vertically downward liquid at a certain tilt angle, so that the powder is initially wetted; it is formed as a disc-shaped component, and a groove 131 is opened on the circumference to form a tooth-shaped structure. The groove 131 includes three side walls 1311, 1312, and 1313, and at least one of the three side walls 1311, 1312, and 1313 is inclined relative to the axis of the disc body. In this embodiment, the side walls 1311 and 1313 are inclined, and the side wall 1312 is parallel to the axis of the disc body. The center of the powder discharge structure 13 is provided with an axial hole 132 of a keyway structure.

[0060] During implementation, the dispersed powder is discharged downward through the groove 131 of the powder discharge structure 13. Since the groove 131 is inclined, the powder discharged downward also goes downward in an inclined direction, thereby colliding with the vertically downward liquid to achieve the effect of preliminary wetting of the powder. Since the powder of many battery materials is several microns in size, it is easy to disperse into single particles after being fully wetted, which can meet the requirements of battery slurry. It can reduce the requirements for subsequent mixing modules, that is, no large stirring power is required during subsequent mixing. It not only makes it easy to mix the powder, but also saves energy.

[0061] refer to Figure 1 , 2 As shown in FIG. 3 , the solid-liquid mixing module 3 includes a mixing container 31 and a stirrer 32 disposed in the mixing container 31 for mixing the liquid to be mixed with the powder to be mixed and rotating rapidly.

[0062] The mixing container 31 includes a vertical portion 311 and a horizontal portion 312. The horizontal portion 312 is disposed at the bottom of the vertical portion 311, and the vertical portion 311 and the horizontal portion 312 are integrally formed. The upper surface of the vertical portion 311 is provided with a corresponding positioning hole 313 corresponding to the positioning hole 112 of the powder dispersion chamber 11. The positioning hole 112 and the positioning hole 313 are formed as countersunk holes. That is, the vertical portion 311 of the mixing container 31 overlaps with the portion below the retaining wall 111 of the powder dispersion chamber 11. Therefore, an annular slit 23 is formed on the outer surface of the powder dispersion chamber 11 and the inner surface of the vertical portion 311 of the mixing container 31. The horizontal portion 312 is formed in a circular ring shape, and a positioning hole 314 is provided near the circumference.

[0063] In this embodiment, the stirrer 32 comprises a container body 321 with two ends opened and a horizontal plate 322 disposed in the middle of the container body 321. The surface of the container body 321 is provided with a leak hole 323, and the horizontal plate 322 is provided with a through groove 324. The horizontal plate 322 is provided with an axial hole 325 in the center.

[0064] refer to Figure 1 , 2 As shown in FIG. 3 , the liquid dispersing module 2 delivers the liquid to the annular slit 23 through a plurality of pumps 21 and a liquid feed pipe 22 corresponding to the pump 21, so that the liquid passes through the annular slit 23 and moves vertically downward. The liquid feed pipe 22 is arranged on a vertical portion 311 of the mixing container 31, and a feed port is arranged at the vertical portion 311 corresponding to the liquid feed pipe 22; by the arrangement of the pump 21, pressure is applied to the liquid to be mixed, so that the pressure to be mixed can move downward at a certain acceleration, preferably, at a linear velocity of 1-2 meters per second.

[0065] refer to Figure 1 , 2 As shown in FIG. 3 , the discharge module 4 includes a discharge container 41 and a dispersing impeller 42 arranged in the discharge container. A discharge pipe 43 is arranged on the side wall of the discharge container 41 , and a pump 44 for adjusting the flow rate of the discharged slurry is arranged on the discharge pipe 43 .

[0066] The discharge container 41 is formed into a U-shaped structure, and a positioning hole 411 is also provided on the upper surface thereof at a position corresponding to the positioning hole 314 . The positioning hole 314 and the positioning hole 411 are formed into countersunk holes.

[0067] refer to Figure 7 As shown, the dispersing impeller 42 comprises a disc body 421 and blades 422, 423 respectively disposed on the upper and lower surfaces of the disc body and perpendicular to the upper and lower surfaces of the disc body 421. An axial hole 424 is disposed at the center of the dispersing impeller 42.

[0068] During implementation, after the liquid to be mixed and the powder to be mixed are mixed in the mixing module 3, the formed slurry falls into the discharge module 4. In the discharge module 4, it can be further fully mixed by the dispersing impeller 42 and then discharged through the discharge pipe 43. The flow rate of the discharged slurry is determined by the pump 44.

[0069] Through this technical solution, the powder to be mixed is initially broken up, and then contacts the liquid to be mixed at a specific inclination angle for preliminary rapid wetting. In the powder dispersion module 1, a spiral feed is used without valve control, which has a stronger stirring force. At the same time, in the mixing module 3, the agitator 32 is rotated quickly to speed up the wetting process of the powder and the liquid. Finally, in the discharge module 4, the impeller 42 for discharging liquid generates a vacuum, which can discharge high-viscosity slurry and generate a vacuum at the same time.

[0070] Embodiment 2:

[0071] The present invention also discloses a mixing method using the solid-liquid mixing device, which comprises the following steps:

[0072] Step 1: First, the liquid to be mixed is transported to the mixing module 3 through the liquid distribution module 2;

[0073] The liquid to be mixed is first transported to the annular slit 23 by the combined action of the pump 21 and the liquid feed pipe 22, so that the liquid passes through the annular slit 23 and moves vertically downward at a certain acceleration. The magnitude of this acceleration depends on the pressure of the liquid to be mixed input by the pump 21.

[0074] In a specific implementation, the total cross-sectional area of ​​the liquid feed pipe 22 should be greater than or equal to the flow area of ​​the annular slit 23 .

[0075] Step 2: After the powder to be mixed is dispersed and / or crushed by the powder dispersing module, it collides with the liquid to be mixed vertically downward at a certain inclination angle to make the powder initially wet;

[0076] Step 3, the preliminarily wetted powder and the liquid to be mixed enter the solid-liquid mixing module for mixing and rapid rotation, and then enter the discharge module;

[0077] Step 4: the solid-liquid mixed slurry after preliminary mixing is further dispersed and then discharged.

[0078] By adjusting the pump on the discharge pipeline, the discharge speed of the slurry is greater than or equal to the feed speed of the liquid to be mixed in step 1, so as to avoid the slurry from being accumulated in the container.

[0079] When in use, the power device drives the shaft 5 to rotate, and the shaft 5 runs through the entire device, thereby driving the spiral cone impact module 12 and the powder discharge structure 13 of the powder dispersion module 1 to rotate, the agitator 32 of the solid-liquid mixing module 3 to rotate, and the dispersion impeller 42 of the discharge module 4 to rotate.

[0080] Embodiment three:

[0081] refer to Figure 8 , 9 , 10, which is a schematic diagram of the structure of the third embodiment of the present invention; compared with the first embodiment, the difference is that:

[0082] The agitator 32' in this embodiment includes an agitator body 321' and blades 326 arranged on the circumference of the body. The blades 326 are arranged upright on the circumference of the agitator body 321'. An axial hole 325' is arranged at the center of the agitator body 321'.

[0083] Embodiment 4:

[0084] refer to Fig.11 , 12 , 13, which is a schematic diagram of the structure of the fourth embodiment of the present invention; compared with the third embodiment, the difference is that:

[0085] The blades 326 are obliquely arranged on the circumference of the agitator body 321 '.

[0086] Embodiment five:

[0087] refer to Fig.14 As shown, compared with the first embodiment, the difference is that:

[0088] The powder dispersion module 1 includes a powder empty chamber 11 and a conical impact module 14 disposed therein, wherein the conical impact module 14 includes a conical body 141, a hard alloy coating or a ceramic coating is disposed on the surface of the conical body 141, and a groove 142 is disposed on the conical body 141. The provision of the groove 142 can prevent the powder from sliding, and the provision of the hard alloy coating or the ceramic coating can better disperse the powder. An axial center hole 143 is disposed at the center of the conical body 141.

[0089] Embodiment six:

[0090] refer to Fig.15 As shown, compared with the first embodiment, the difference is that:

[0091] The powder dispersing module 1 comprises a powder dispersing chamber 11 and a pin-type impact module 15 disposed therein, wherein the pin-type impact module 15 comprises a conical body 151 and a group of stirring rods 152 disposed on the surface of the conical body 151. The stirring rods 152 can better disperse the powder.

[0092] Embodiment seven:

[0093] refer to Fig.16 As shown, compared with the first embodiment, the difference is that:

[0094] The powder dispersion module 1 comprises a powder dispersion chamber 11 and a wing-type impact module 16 disposed therein, wherein the wing-type impact module 16 comprises a conical body 161 and a group of impact components 162 disposed on the surface of the conical body 161, and the impact component 162 comprises a connecting rod 1621 and an impact block 1622, wherein one end of the connecting rod 1621 is connected to the surface of the conical body 161, and the other end is connected to the impact block 1622. By increasing the contact area, the powder can be evenly dispersed.

[0095] Embodiment eight:

[0096] refer to Fig.17 , 17AAs shown, compared with the first embodiment, the difference is that:

[0097] The dispersing impeller 42ˊ is shaped like a fan blade and includes a central connecting block 421ˊ and a fan blade 422ˊ integrally formed with the connecting block 421ˊ. The fan blade 422ˊ is provided with two edges 4221ˊ and 4222ˊ. In the present embodiment, stirring bars 425 and 426 are provided on both the upper and lower sides of the edge 4221ˊ.

[0098] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A solid-liquid mixing device, characterized in that: It includes a liquid distribution module, a powder dispersion module, a solid-liquid mixing module and a discharge module; The liquid distribution module transports the liquid to be mixed to the solid-liquid mixing module; The powder dispersing module is used to disperse and / or crush the powder to be mixed, and then enter the solid-liquid mixing module; the powder dispersing module includes a powder dispersing chamber and a powder discharge structure arranged therein, the powder discharge structure is used to make the powder collide with the liquid vertically downward at a certain inclination angle to make the powder initially wet, the powder discharge structure is arranged in the powder dispersing chamber near the solid-liquid mixing module, the powder discharge structure is formed as a disc-shaped component, and a groove is opened on the circumference to form a tooth-shaped structure, the groove penetrates the powder discharge structure along the axial direction of the powder discharge structure, the two opposite side walls of the groove are respectively inclined relative to the axis of the disc body of the powder discharge structure, and the other side wall of the groove is parallel to the axis of the disc body of the powder discharge structure; The solid-liquid mixing module includes a mixing container, the outer surface of the powder dispersion chamber and the inner surface of the mixing container form an annular slit, the liquid distribution module transports the liquid to be mixed into the annular slit, and the liquid to be mixed enters the solid-liquid mixing module after passing through the annular slit, and the liquid to be mixed and the powder to be mixed are mixed and rotated rapidly in the solid-liquid mixing module, and then discharged by the discharge module.

2. The solid-liquid mixing device according to claim 1, characterized in that: The liquid distribution module conveys the liquid to the annular slit through one or more pumps and a liquid feed pipe corresponding to the pump, so that the liquid passes through the annular slit and then flows vertically downward.

3. The solid-liquid mixing device according to claim 1, characterized in that: The powder dispersing module is an impact-type powder dispersing and crushing device.

4. The solid-liquid mixing device according to claim 3, characterized in that: The powder dispersion module comprises a spiral cone impact module arranged in the powder dispersion chamber, and the spiral cone impact module comprises a cone body and a cutting blade arranged on the surface of the cone body and spirally upward.

5. The solid-liquid mixing device according to claim 3, characterized in that: The powder dispersion module comprises a conical impact module arranged in the powder dispersion chamber, wherein the conical impact module comprises a conical body, a surface of the conical body is provided with a cemented carbide coating or a ceramic coating, and a groove is provided on the conical body.

6. The solid-liquid mixing device according to claim 3, characterized in that: The powder dispersion module comprises a rod-pin type impact module arranged in the powder dispersion chamber, and the rod-pin type impact module comprises a conical body and a group of stirring rods arranged on the surface of the conical body.

7. The solid-liquid mixing device according to claim 3, characterized in that: The powder dispersion module comprises a wing-type impact module arranged in the powder dispersion chamber, the wing-type impact module comprises a conical body and a group of impact components arranged on the surface of the conical body, the impact component comprises a connecting rod and an impact block, one end of the connecting rod is connected to the surface of the conical body, and the other end is connected to the impact block.

8. The solid-liquid mixing device according to claim 1, characterized in that: The solid-liquid mixing module comprises a stirrer arranged in the mixing container for mixing the liquid to be mixed with the powder to be mixed and rotating rapidly.

9. The solid-liquid mixing device according to claim 8, characterized in that: The stirrer comprises a stirrer body and blades arranged on the circumference of the body.

10. The solid-liquid mixing device according to claim 9, characterized in that: The blades are uprightly arranged on the circumference of the body.

11. The solid-liquid mixing device according to claim 9, characterized in that: The blades are arranged obliquely on the circumference of the body.

12. The solid-liquid mixing device according to claim 8, characterized in that: The stirrer comprises a container with openings at both ends and a horizontal plate arranged in the middle of the container. The surface of the container is provided with leakage holes, and the horizontal plate is provided with through grooves.

13. The solid-liquid mixing device according to claim 1 or 8, characterized in that: The discharge module comprises a discharge container and a dispersing impeller arranged in the discharge container, and a discharge pipe is arranged on the side wall of the discharge container.

14. The solid-liquid mixing device according to claim 13, characterized in that: The discharge pipeline is provided with a pump for adjusting the flow rate of the discharged slurry.

15. The solid-liquid mixing device according to claim 14, characterized in that: The dispersing impeller comprises a disc body and blades respectively arranged on the upper and lower surfaces of the disc body and perpendicular to the upper and lower surfaces of the disc.

16. The solid-liquid mixing device according to claim 14, characterized in that: The dispersing impeller is shaped like a fan blade and comprises a central connecting block and a fan blade integrally formed with the connecting block. A stirring bar is provided on at least one side of the fan blade and at least one side of the upper and lower sides.

17. A mixing method using the solid-liquid mixing device according to any one of claims 1 to 16, characterized in that: Step 1: first, the liquid to be mixed is transported to the solid-liquid mixing module through the liquid distribution module; step 2: the powder to be mixed is dispersed and / or crushed by the powder dispersion module, and then collides with the vertically downward liquid to be mixed at a certain inclination angle to make the powder initially wet; step 3: the initially wetted powder and the liquid to be mixed enter the solid-liquid mixing module together for mixing and rapid rotation, and then enter the discharge module; step 4: the solid-liquid mixed slurry after initial mixing is further dispersed therein and then discharged.

18. The mixing method of the solid-liquid mixing device according to claim 17, characterized in that: In step 1, the liquid to be mixed is first transported to the annular slit by the combined action of a pump and a liquid feed pipe, so that the liquid passes through the annular slit and then moves vertically downward at a certain speed.

19. The mixing method of the solid-liquid mixing device according to claim 18, characterized in that: In step one, the total cross-sectional area of ​​the liquid feed pipe is greater than or equal to the flow area of ​​the annular slit.

20. The mixing method of the solid-liquid mixing device according to claim 17, characterized in that: In step 4, the pump on the discharge pipeline is adjusted so that the discharge speed of the slurry is greater than or equal to the feed speed of the liquid to be mixed in step 1.

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