A stirring and homogenizing slurry tank and a stirring and homogenizing method

Abstract

The present invention provides a stirring and homogenizing pulp pool and a stirring and homogenizing method, wherein the stirring and homogenizing pulp pool comprises: a pulp pool body, wherein a stirring space is provided in the pulp pool body; an inner pulp pool partition wall, which is provided in the pulp pool body and divides the stirring space into a plurality of sub-pulp pools that are sequentially connected and end-to-end connected; and a plurality of stirring devices, all of which are provided on the pulp pool body and are arranged one-to-one corresponding to the sub-pulp pools. The present invention rationally divides the stirring space by the inner pulp pool partition wall, and the multiple sub-pulp pools divided are sequentially connected and end-to-end connected, thereby ensuring that the slurry circulates and stirs between the sub-pulp pools, thereby realizing that the large-capacity stirring and homogenizing pulp pool is a whole in structure, and realizing sufficient stirring of the slurry in the large-capacity pulp pool, thereby realizing the homogenization of a certain batch of slurry, and the slurry composition is uniform and stable and is not prone to stratification and precipitation, thereby achieving the effect of sufficient stirring of large quantities of slurry.

Description

Technical Field

[0001] The present invention relates to the technical field of ceramic slurry production, in particular to a stirring and homogenizing slurry tank and a stirring and homogenizing method. Background Art

[0002] In the production process of building ceramic raw materials, after the ceramic raw materials are crushed and ground into slurry, they need to be stored, stirred and homogenized in underground or above-ground slurry pools to achieve uniform and stable composition of a certain batch of slurry, providing basic guarantee for high-quality and stable production in subsequent production processes.

[0003] In traditional ceramic slurry storage and mixing homogenization technology, in order to achieve a certain batch of slurry storage, the diameter and height of a single cylindrical or polygonal slurry storage tank are often designed and built into a large-scale mixing slurry storage tank with a diameter of more than 10 meters, a height of 8 to 10 meters, and a single slurry tank capacity of more than 600 to 700 cubic meters. Although the capacity of such a large slurry tank can meet the slurry storage requirements of slurry batches and is equipped with a large-diameter and high-power mixer for mixing and homogenization, the slurry is often not sufficiently mixed due to reasons such as the large mixing radius of the slurry tank and the large height difference of the slurry tank. In actual production, the slurry composition at different positions in the same slurry tank, especially at the bottom and top, center and edge of the slurry tank, will have large deviations and fluctuations, and the slurry will be stratified up and down. Due to insufficient mixing, some large particles in the slurry will gradually sink under the action of gravity, and the amount of sediment at the bottom of the slurry tank will increase day by day, eventually causing the mixer to get stuck and unable to stir, forcing the production to be stopped and the slurry tank to be cleaned.

[0004] Therefore, the existing technology has defects and needs to be improved and developed. Summary of the Invention

[0005] The technical problem to be solved by the present invention is that, in response to the above-mentioned defects of the prior art, a stirring and homogenizing slurry tank and a stirring and homogenizing method are provided, aiming to solve the problem in the prior art that the homogenization of the same batch cannot be completed in a small-capacity slurry tank, and insufficient stirring occurs in a large-capacity slurry tank.

[0006] The technical solutions adopted by the present invention to solve the technical problems are as follows:

[0007] A stirring and homogenizing slurry tank, comprising:

[0008] A pulp pool body, wherein a stirring space is provided in the pulp pool body;

[0009] An inner pulp pool partition wall is provided in the pulp pool body, and the inner pulp pool partition wall divides the stirring space into a plurality of sub-pulp pools that are sequentially connected and connected end to end;

[0010] And a plurality of stirring devices are all arranged on the pulp pool body and are arranged one by one corresponding to the sub-pulp pools.

[0011] In one implementation, the inner partition wall of the pulp pool includes multiple pool partition walls, and the sub-pulp pool is formed between two adjacent pool partition walls; a flow channel is provided at the first end of the pool partition wall, and the flow channel is used to connect the two adjacent sub-pulp pools; the second end of the pool partition wall is connected to the adjacent pool partition wall.

[0012] In one implementation, the pool partition wall includes a fixing portion and a guide portion that are integrally connected; the guide portion is used to guide the slurry to the corresponding flow channel, and the guiding direction of all the guide portions is set in a clockwise or counterclockwise direction; the end of the fixing portion facing away from the guide portion is connected to the adjacent pool partition wall.

[0013] In one implementation, the pulp pool body includes:

[0014] pulp pool base;

[0015] The outer wall of the pulp pool is arranged on the pulp pool base and encloses the pulp pool base to form the stirring space;

[0016] and a pulp pool upper cover plate, covering the outer wall of the pulp pool and the inner partition wall of the pulp pool;

[0017] Wherein, each of the pool partition walls is fixed on the pulp pool base, and the flow channel is formed between the guide portion of each of the pool partition walls and the outer wall of the pulp pool.

[0018] In one implementation, the pool partition wall is set to a first arc shape; the pulp pool outer wall includes a plurality of side walls connected in sequence and connected end to end; the connection between two adjacent side walls is set to a second arc shape, and each connection is set opposite to a pool partition wall.

[0019] In one implementation, the circle where the first arc is located coincides with the circle where the second arc is located.

[0020] In one implementation, four pool partition walls are provided, the cross section of the pulp pool body is square, four sub-pulp pools are provided, and four side walls are provided.

[0021] In one implementation, the stirring device includes:

[0022] A mixer driving member is provided on the upper cover plate of the pulp tank;

[0023] and stirring blades, which are arranged in the sub-slurry pool and connected to the stirring machine driving component, and each stirring blade is provided with multiple layers in the height direction.

[0024] In one implementation, the stirring and homogenizing slurry tank further includes:

[0025] A plurality of pulp inlet pipes are provided on the pulp pool body, and the plurality of pulp inlet pipes are provided in one-to-one correspondence with the sub-pulp pools;

[0026] A plurality of inspection holes are provided on the pulp pool body, and the plurality of inspection holes are provided in one-to-one correspondence with the sub-pulp pools;

[0027] And a pulp discharge pipe is arranged on the pulp pool body.

[0028] The present invention also discloses a stirring and homogenizing method based on the stirring and homogenizing slurry tank as described above, which comprises:

[0029] The slurry flows into the stirring space in the pulp tank body and then enters the sub-slurry tank;

[0030] Each stirring device stirs the slurry in the corresponding sub-slurry pool. During the stirring process, the slurry in the sub-slurry pool flows to the adjacent sub-slurry pool to continue stirring.

[0031] The slurry in each sub-slurry pool is continuously circulated under the stirring of the stirring device to obtain a homogenized slurry.

[0032] The present invention provides a stirring and homogenizing pulp pool and a stirring and homogenizing method, wherein the stirring and homogenizing pulp pool comprises: a pulp pool body, wherein a stirring space is provided in the pulp pool body; an inner pulp pool partition wall, which is provided in the pulp pool body and divides the stirring space into a plurality of sub-pulp pools that are sequentially connected and end-to-end connected; and a plurality of stirring devices, all of which are provided on the pulp pool body and are arranged one-to-one corresponding to the sub-pulp pools. The present invention rationally divides the stirring space by the inner pulp pool partition wall, and the multiple sub-pulp pools divided are sequentially connected and end-to-end connected, thereby ensuring that the slurry circulates and stirs between the sub-pulp pools, thereby realizing that the large-capacity stirring and homogenizing pulp pool is a whole in structure, and realizing sufficient stirring of the slurry in the large-capacity pulp pool, thereby realizing the homogenization of a certain batch of slurry, achieving the effect that the slurry composition is uniform and stable and not prone to stratification and precipitation, and thereby achieving the effect of sufficient stirring of large quantities of slurry. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is a top view of a preferred embodiment of the stirring and homogenizing slurry tank in the present invention.

[0034] Figure 2 yes Figure 1 Cross-sectional view at AA in the middle.

[0035] Description of reference numerals:

[0036] 100. Slurry pool body; 110. Slurry pool base; 120. Slurry pool outer wall; 130. Slurry pool upper cover; 200. Slurry pool inner partition wall; 210. Pool partition wall; 211. Fixing part; 212. Guide part; 300. Sub-slurry pool; 400. Stirring device; 410. Stirring drive member; 420. Stirring blade; 500. Flow channel; 600. Slurry inlet pipe; 700. Inspection hole; 800. Slurry outlet pipe. DETAILED DESCRIPTION

[0037] In order to make the purpose, technical solutions and advantages of the present invention more clear and distinct, the present invention is further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0038] In traditional ceramic slurry storage and mixing homogenization technology, in order to achieve a certain batch of slurry storage, the diameter and height of a single cylindrical or polygonal slurry storage tank are often designed and built into a large-scale mixing slurry storage tank with a diameter of more than 10 meters, a height of 8 to 10 meters, and a single slurry tank capacity of more than 600 to 700 cubic meters. Although the capacity of such a large slurry tank can meet the slurry storage requirements of slurry batches and is equipped with a large-diameter and high-power mixer for mixing and homogenization, the slurry is often not sufficiently mixed due to reasons such as the large mixing radius of the slurry tank and the large height difference of the slurry tank. In actual production, the slurry composition at different positions in the same slurry tank, especially at the bottom and top, center and edge of the slurry tank, will have large deviations and fluctuations, and the slurry will be stratified up and down. Due to insufficient mixing, some large particles in the slurry will gradually sink under the action of gravity, and the amount of sediment at the bottom of the slurry tank will increase day by day, eventually causing the mixer to get stuck and unable to stir, forcing the production to be stopped and the slurry tank to be cleaned.

[0039] In the prior art, in order to solve the problem of insufficient stirring in the above-mentioned large-capacity slurry pool, it is necessary to set up multiple groups of slurry pools. However, setting up multiple groups of slurry pools also requires solving the problem of uniform slurry mixing, and a large number of slurry pipes, valves and slurry pumps need to be configured. Moreover, the slurry is continuously pumped and poured between the slurry pools through pipes, which consumes a lot of electricity and the frequent contact and friction between the pump body and the inner wall of the pipe during the slurry pumping process can easily cause wear, thereby increasing production and operation costs.

[0040] The present invention provides a stirring and homogenizing pulp tank, which is designed with a large capacity pulp tank and reasonably divides and guides the interior of the pulp tank to form a plurality of stirring pulp tanks of appropriate capacity. This large capacity stirring and homogenizing pulp tank can not only give full play to the advantages of small and medium capacity pulp tanks in which the slurry is fully stirred and not easy to stratify and precipitate, but also achieve the purpose of batch homogenizing slurry in large capacity pulp tanks.

[0041] See Figure 1 and Figure 2The present invention provides a stirring and homogenizing pulp chest, comprising: a pulp chest body 100, an inner pulp chest partition wall 200, and a plurality of stirring devices 400. A stirring space is provided within the pulp chest body 100; the inner pulp chest partition wall 200 is disposed within the pulp chest body 100 and divides the stirring space into a plurality of interconnected and end-to-end sub-slurry chests 300. The plurality of stirring devices 400 are each disposed on the pulp chest body 100 and correspond one to each of the sub-slurry chests 300.

[0042] The present invention rationally divides the stirring space by the partition wall 200 in the pulp pool, and the multiple sub-pulp pools 300 divided into the partitions are connected in sequence and connected end to end, so that the slurry can be ensured to circulate and stir between the sub-pulp pools 300, which not only realizes that the large-capacity stirring and homogenizing pulp pool is a whole in structure, but also realizes that the slurry is fully stirred in the large-capacity pulp pool, thereby realizing the homogenization of a certain batch of slurry, and achieving the effect that the slurry composition is uniform and stable and not prone to stratification and precipitation.

[0043] In one embodiment of the present invention, the pulp pool inner partition wall 200 includes a plurality of pool partition walls 210, and the sub-pulp pool 300 is formed between two adjacent pool partition walls 210; a flow channel 500 is provided at the first end of the pool partition wall 210, and the flow channel 500 is used to connect the two adjacent sub-pulp pools 300; the second end of the pool partition wall 210 is connected to the adjacent pool partition wall 210.

[0044] Specifically, the inner partition wall 200 of the pulp pool of the present invention is arranged in the middle of the stirring space, and a flow channel 500 is provided at the edge of each pool partition wall 210 to facilitate the circulation of pulp between two adjacent sub-pulp pools 300.

[0045] In a further embodiment of the present invention, the pool partition wall 210 includes a fixing portion 211 and a guide portion 212 that are integrally connected; the guide portion 212 is used to guide the slurry to the corresponding flow channel 500, and the guiding direction of all the guide portions 212 is set in a clockwise or counterclockwise direction; the end of the fixing portion 211 facing away from the guide portion 212 is connected to the adjacent pool partition wall 210.

[0046] Specifically, the slurry in each sub-slurry pool 300 flows in a clockwise or counterclockwise direction during stirring and circulation. In order to improve the smoothness of the flow, a guide portion 212 is provided on the pool partition wall 210 so that the slurry in the sub-slurry pool 300 can flow smoothly to the next sub-slurry pool 300 under the guidance of the guide portion 212.

[0047] In one embodiment of the present invention, the pulp pool body 100 includes a pulp pool base 110, a pulp pool outer wall 120, and a pulp pool upper cover 130. The pulp pool outer wall 120 is disposed on the pulp pool base 110 and, together with the pulp pool base 110, forms the stirring space; the pulp pool upper cover 130 covers the pulp pool outer wall 120 and the pulp pool inner partition wall 200. Each of the pool partition walls 210 is fixed to the pulp pool base 110, and the flow channel 500 is formed between the guide portion 212 of each pool partition wall 210 and the pulp pool outer wall 120.

[0048] Specifically, a large-capacity pulp pool shell is formed by the pulp pool upper cover 130, the pulp pool outer wall 120, and the pulp pool base 110, which can be used according to the homogenization amount of the pulp batch produced. The cross-section of the pulp pool outer wall 120 can be set to a polygon. The reasonable separation and guidance design of the interior of the pulp pool by the pulp pool inner partition wall 200 not only realizes the structural integrity of the large-capacity stirring and homogenizing pulp pool, but also realizes the homogenization of a certain batch of pulp, achieving the effect of uniform and stable pulp composition and not prone to stratification and precipitation.

[0049] In one embodiment, the pool partition wall 210 is set to a first arc shape; the pulp pool outer wall 120 includes a plurality of side walls connected in sequence and connected end to end; the connection between two adjacent side walls is set to a second arc shape, and each connection is set opposite to a pool partition wall 210.

[0050] Specifically, the sub-pool 300 is shaped like a segmented arc and comprises a first arc-shaped pool partition wall 210 and a second arc-shaped pool outer wall 120. The present invention provides a two-segment arc-shaped cross-section of the sub-pool 300, eliminating corners and preventing slurry from settling in the corners, thereby improving smoother slurry stirring.

[0051] In a further embodiment of the present invention, the circle encompassing the first arc and the circle encompassing the second arc overlap. Specifically, the circle encompassing the first arc and the circle encompassing the second arc overlap, thereby forming the sub-pool 300 into a segmented cylinder. A paddle having a radius slightly smaller than the radius of the circle is selected. This allows the paddle to perform circular motion within the sub-pool 300, leaving only a small gap between the paddle edge and the pool partition wall 210, and also between the paddle edge and the two side walls. This ensures that the slurry at both the center and edges of the sub-pool 300 is fully agitated, preventing significant deviations and fluctuations in the slurry composition between the center and edges.

[0052] In one embodiment of the present invention, four partition walls 210 are provided, the pulp pool body 100 has a square cross-section, four sub-pools 300 are provided, and four side walls are provided. Specifically, the cross-section of the pulp pool body 100 is square, with arc-shaped corners. This square can be divided into four circles of equal radius, with the radius of the sub-pool 300 circles being slightly larger than the agitation radius of the sub-pool 300. The present invention provides four partition walls 210, four sub-pools 300, and four side walls, maximizing the agitation space, improving space utilization, and thereby reducing costs.

[0053] In one embodiment of the present invention, the stirring device 400 includes a stirring drive 410 and stirring blades 420. The stirring drive 410 is disposed on the pulp pool upper cover 130, and the stirring blades 420 are disposed in the sub-slurry pool 300 and connected to the stirring drive 410. Each stirring blade 420 is provided with multiple layers in the height direction.

[0054] Specifically, in order to solve the problem of large deviation between the top and bottom of the pulp pool, the stirring blades 420 of the stirring drive 410 are arranged in multiple layers in the height direction. In this way, blades are distributed at different depths of the sub-pulp pool 300, avoiding the upper and lower stratification of the pulp.

[0055] In one embodiment of the present invention, the mixing and homogenizing pulp chest further comprises: a plurality of pulp inlet pipes 600, a plurality of inspection holes 700, and a pulp outlet pipe 800. The plurality of pulp inlet pipes 600 are provided on the pulp chest body 100, and the plurality of pulp inlet pipes 600 are provided in a one-to-one correspondence with the sub-pulp chests 300; the plurality of inspection holes 700 are provided on the pulp chest body 100, and the plurality of inspection holes 700 are provided in a one-to-one correspondence with the sub-pulp chests 300; and the pulp outlet pipe 800 is provided on the pulp chest body 100.

[0056] Specifically, each sub-slurry tank 300 is provided with a corresponding slurry inlet pipe 600 and an inspection hole 700. The homogenized slurry required for production batches flows into the sub-slurry tank 300 formed by the internal partition wall inside the slurry tank through the slurry inlet pipe 600. The tank partition wall 210 has a guide portion 212. Driven by the stirring drive member 410, the stirring blade 420 fully stirs and rolls the slurry in the sub-slurry tank 300. The stirring blade 420 stirs the slurry in a circular motion (such as Figure 1While the slurry is flowing (as indicated by the arrows in the figure), it also drives some of the slurry into the reserved flow channel 500 between the pool partition wall 210 and the pulp pool outer wall 120. Through the flow channel 500, it flows into another sub-slurry pool 300 for further mixing. After the slurry circulates and stirs within the pulp pool in this manner, its components are mixed, homogenized, and stabilized. The slurry is then pumped through the pulp outlet pipe 800 to the next production process for use. The pulp pool manhole 700 is provided for regular maintenance and cleaning of the pulp pool and is closed during normal use.

[0057] The present invention designs a stirring and homogenizing pulp pool, which forms a plurality of sub-pulp pools 300 of appropriate capacity by reasonably dividing and guiding the interior of a large-capacity pulp pool. This large-capacity stirring and homogenizing pulp pool can not only give full play to the advantages of sufficient stirring of the slurry in small and medium-capacity pulp pools and not easy stratification and precipitation, but also achieve the purpose of batch homogenization of slurry in large-capacity pulp pools. It has the advantages of simple structure, convenient operation, and high degree of automation.

[0058] The present invention also provides a stirring and homogenizing method based on the stirring and homogenizing slurry tank as described above, which comprises:

[0059] The slurry flows into the stirring space in the pulp tank body 100 and then enters the sub-slurry tank 300;

[0060] Each stirring device 400 stirs the slurry in the corresponding sub-slurry pool 300. During the stirring process, the slurry in the sub-slurry pool 300 flows to the adjacent sub-slurry pool 300 to continue stirring.

[0061] The slurry in each sub-slurry pool 300 is continuously circulated under the stirring of the stirring device 400 to obtain a homogenized slurry; the details are as described above.

[0062] In one implementation, slurry flows into each sub-pool 300 through its corresponding inlet pipe 600. Driven by the stirring drive 410, the stirring blades 420 within each sub-pool 300 stir the slurry in the direction of the guide portion 212 of the slurry partition wall 210. Specifically, if the guide direction is clockwise, the stirring blades 420 stir the slurry in a clockwise direction; if the guide direction is counterclockwise, the stirring blades 420 stir the slurry in a counterclockwise direction. During the stirring process, some of the slurry is driven into the flow channel 500 reserved between the slurry partition wall 210 and the slurry pool outer wall 120. Through the flow channel 500, the slurry flows into another sub-pool 300 for further stirring and mixing. This circulation and stirring of the slurry within the slurry pool results in the mixing, homogenization, and stabilization of the slurry components. The slurry is then pumped through the slurry discharge pipe 800 to the next production process. The slurry pool is normally closed during operation.

[0063] In summary, the present invention discloses a stirring and homogenizing pulp pool and a stirring and homogenizing method, wherein the stirring and homogenizing pulp pool comprises: a pulp pool body, wherein a stirring space is provided in the pulp pool body; an inner pulp pool partition wall, which is provided in the pulp pool body, and the inner pulp pool partition wall divides the stirring space into a plurality of sub-pulp pools which are connected in sequence and end to end; and a plurality of stirring devices, which are all provided on the pulp pool body and are provided one-to-one with the sub-pulp pools. The present invention rationally divides the stirring space by the inner pulp pool partition wall, and the plurality of sub-pulp pools divided are connected in sequence and end to end, thereby ensuring that the slurry circulates and stirs between the sub-pulp pools, thereby realizing that the large-capacity stirring and homogenizing pulp pool is a whole in structure, and realizing sufficient stirring of the slurry in the large-capacity pulp pool, thereby realizing the homogenization of a certain batch of slurry, achieving the effect that the slurry composition is uniform and stable and not prone to stratification and precipitation, and thereby achieving the effect of sufficient stirring of large quantities of slurry.

[0064] It should be understood that the application of the present invention is not limited to the above examples. For those skilled in the art, improvements or changes can be made based on the above description. All these improvements and changes should fall within the scope of protection of the claims attached to the present invention.

Claims

1. A stirring and homogenizing slurry tank, characterized in that: include: A pulp pool body, wherein a stirring space is provided in the pulp pool body; An inner pulp pool partition wall is provided in the pulp pool body, and the inner pulp pool partition wall divides the stirring space into a plurality of sub-pulp pools that are sequentially connected and connected end to end; and a plurality of stirring devices, all of which are arranged on the pulp pool body and are arranged one-to-one corresponding to the sub-pulp pools; The pulp pool inner partition wall includes a plurality of pool partition walls, and the sub-pulp pool is formed between two adjacent pool partition walls; a flow channel is provided at a first end of the pool partition wall, and the flow channel is used to connect the two adjacent sub-pulp pools; the second end of the pool partition wall is connected to the adjacent pool partition wall; The pool partition wall includes a fixed portion and a guide portion that are integrally connected; the guide portion is used to guide the slurry to the corresponding flow channel, and the guiding direction of all the guide portions is set in a clockwise or counterclockwise direction; the end of the fixed portion away from the guide portion is connected to the adjacent pool partition wall; The pulp pool body includes: pulp pool base; The outer wall of the pulp pool is arranged on the pulp pool base and encloses the pulp pool base to form the stirring space; and a pulp pool upper cover plate, covering the outer wall of the pulp pool and the inner partition wall of the pulp pool; Wherein, each of the pool partition walls is fixed on the pulp pool base, and the flow channel is formed between the guide portion of each of the pool partition walls and the outer wall of the pulp pool; The pool partition wall is configured as a first arc shape; the pulp pool outer wall includes a plurality of side walls connected in sequence and end to end; the connection between two adjacent side walls is configured as a second arc shape, and each connection is configured opposite to a pool partition wall; The circle where the first arc is located and the circle where the second arc is located coincide with each other; The stirring device comprises: A mixer driving member is provided on the upper cover plate of the pulp tank; and stirring blades, which are arranged in the sub-slurry pool and connected to the stirring machine driving member, and each stirring blade is provided with multiple layers in the height direction; Driven by the stirring drive, the stirring blades fully stir the slurry in the sub-slurry pool. While the stirring blades stir the slurry along the circular motion, the slurry flows into the other sub-slurry pool through the flow channel reserved between the pool partition wall and the outer wall of the slurry pool to continue stirring and mixing.

2. The stirring and homogenizing slurry tank according to claim 1, characterized in that: There are four pool partition walls, the cross section of the pulp pool body is square, there are four sub-pulp pools, and there are four side walls.

3. The stirring and homogenizing slurry tank according to claim 1, characterized in that: The stirring and homogenizing slurry tank also includes: A plurality of pulp inlet pipes are provided on the pulp pool body, and the plurality of pulp inlet pipes are provided in one-to-one correspondence with the sub-pulp pools; A plurality of inspection holes are provided on the pulp pool body, and the plurality of inspection holes are provided in one-to-one correspondence with the sub-pulp pools; And a pulp outlet pipe is arranged on the pulp pool body.

4. A stirring and homogenizing method based on the stirring and homogenizing slurry tank according to any one of claims 1 to 3, characterized in that: include: The slurry flows into the stirring space in the pulp tank body and then enters the sub-slurry tank; Each stirring device stirs the slurry in the corresponding sub-slurry tank. During the stirring process, the slurry in the sub-slurry tank flows to the adjacent sub-slurry tank to continue stirring. The slurry in each sub-slurry pool is continuously circulated under the stirring of the stirring device to obtain a homogenized slurry.

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