Multifunctional solid-liquid mixing tank and mixing method thereof

Abstract

The invention discloses a multifunctional solid-liquid mixing tank and a mixing method thereof. The multifunctional solid-liquid mixing tank comprises a closed tank body and a conical tank bottom arranged at the lower end of the closed tank body, an annular partition plate extending downwards from the top end is arranged in the closed tank body, a main stirring area is formed in the annular partition plate, and an auxiliary stirring area is formed between the outer side of the annular partition plate and the inner wall of the closed tank body and communicated with the main stirring area through the lower end of the annular partition plate; a main stirrer and an auxiliary stirrer which extend to the main stirring area and the auxiliary stirring area are respectively arranged at the top end of the closed tank body; an overflow check ring is arranged on the inner wall of the closed tank body in the circumferential direction, and an overflow groove is formed between the overflow check ring and the inner wall of the closed tank body; a plurality of overflow ports are circumferentially formed in the outer wall of the closed tank body; the top end of the closed tank body is provided with a liquid feeding hole and a solid feeding hole corresponding to the main stirring area; the top end of the closed tank body is provided with observation ports corresponding to the main stirring area and the auxiliary stirring area. The device can effectively control the equivalent diameter and content of solid insoluble substances in the slurry / solution, realizes high-efficiency uniform mixing, and reduces the stirring energy consumption.

Description

Technical Field

[0001] The invention relates to the technical field of mixing, and in particular to a multifunctional solid-liquid mixing tank and a mixing method thereof. Background Art

[0002] In the process of industrial production, it is often necessary to mix different raw materials according to the process ratio. Therefore, mixing tanks are widely used in the industrial field. Its working principle is as follows: by driving the stirring component, multiple raw materials are fully mixed, and the mixing of solid and liquid raw materials is the most widely used. In the existing mixing tank, generally only one stirring shaft and components are set in the inner cavity of the tank body, and the materials injected into the tank body are uniformly stirred. The defects of this structure are: limited by the stirring power, the stirring speed is low, the mixing effect is not ideal, and there is even a phenomenon that solid materials float on the surface of the slurry / solution for a long time; if stirred at high speed, the energy consumption is too high because the slurry / solution required to be stirred is large; when the slurry / solution continues to generate foam during the stirring process, it is easy to cause the solid material to be difficult to sink at the feed port, and it is easy to form material accumulation, and even block the feed port. For industrial production processes, powders often contain particles larger than the target equivalent diameter, which are difficult to effectively remove in existing mixing tanks. They enter the next process with the slurry / solution, which is easy to cause pipeline or equipment blockage, affecting production. In addition, for the foam problem that occurs during the solid-liquid mixing process, it is still necessary to avoid the operational hazards caused by liquid level distortion.

[0003] Chinese patent CN108144530A discloses a solid-liquid chemical raw material mixing tank, which is a special mixing tank for solid-liquid chemical raw materials through a certain structural combination; however, the tank adopts a built-in crushing cylinder to directly send the crushed material to the stirring mechanism, which increases the complexity of the equipment and reduces the reliability of the equipment; the crushing effect of the crushing cylinder is poor, the particle size distribution is wide, and it is difficult to ensure the separation effect of particles larger than the target equivalent diameter; there is no effective measure for the solid-liquid mixing process that is prone to foaming.

[0004] China CN206276383U provides a chemical stirring reaction tank for separate mixing of solid and liquid raw materials. The liquid material feeding device is used to expand the spraying area and spraying speed of the liquid material; the solid material and the liquid material are preliminarily mixed through the material balancing plate; the solid and liquid materials are stirred and mixed through the lifting and stirring device, which is convenient for the materials to be fully stirred and mixed. Because the solid-liquid ratio of the reaction tank is too large during the initial mixing, it is difficult to ensure the mixing effect, and it is easy to form mud blocks, resulting in blockage; the lifting and stirring increases the complexity of the equipment, resulting in reduced equipment reliability, especially prone to liquid leakage. Summary of the invention

[0005] Technical problem to be solved: In view of the problems existing in the prior art, the present invention provides a multifunctional solid-liquid mixing tank and a mixing method thereof, which can effectively control the amount of slurry / solution that needs to be quickly stirred, not only can effectively mix the solid materials, but also reduce the energy consumption of the stirring process.

[0006] Technical solution: The multifunctional solid-liquid mixing tank of the present invention comprises a closed tank body and a conical tank bottom arranged at the lower end thereof, wherein a slag discharge port is arranged at the lower end of the conical tank bottom; An annular partition is provided in the closed tank body extending downward from the top, and the annular partition is arranged coaxially with the closed tank body; a main stirring zone is formed in the annular partition, and a secondary stirring zone is formed between the outer side of the annular partition and the inner wall of the closed tank body, and the secondary stirring zone is connected with the main stirring zone through the lower end of the annular partition; The top of the closed tank is provided with a main stirrer and a secondary stirrer extending to the main stirring zone and the secondary stirring zone respectively; The inner wall of the closed tank body is provided with an overflow retaining ring along its circumference, the longitudinal section of the overflow retaining ring is an L-shaped structure, and an overflow groove is formed between the overflow retaining ring and the inner wall of the closed tank body; the outer wall of the closed tank body is provided with a plurality of overflow ports connected with the overflow groove in the circumferential direction; a clearance cavity is formed in the closed tank body above the overflow retaining ring; The top of the closed tank body is provided with a liquid feed inlet and a solid feed inlet corresponding to the main stirring zone; The top of the closed tank body is provided with observation ports corresponding to the main stirring zone and the auxiliary stirring zone.

[0007] Preferably, the top of the closed tank body is provided with a plurality of nozzles corresponding to the main stirring zone and the auxiliary stirring zone, and the plurality of nozzles cover the liquid surface areas of the corresponding main stirring zone and the auxiliary stirring zone slurry / solution; Or / and the outer wall of the closed tank body and the side wall of the annular partition are respectively provided with nozzles corresponding to the main stirring zone and the auxiliary stirring zone, and the nozzles are correspondingly arranged 5 to 15 cm above the liquid level surface formed by the overflow retaining ring, and the nozzles radially spray the fluid with defoaming function along the closed tank body.

[0008] Preferably, the stirring shaft of the main agitator is provided with at least two layers of stirring blades, the upper stirring blades are 1 to 10 cm higher than the liquid level in the main stirring zone, and the diameter of the upper stirring blades is sufficient for the rotational sweep area to completely cover the liquid surface area in the main stirring zone.

[0009] Preferably, the upper stirring blade is a horizontally installed straight blade, which is 4 to 20 cm higher than the liquid level in the main stirring zone.

[0010] Preferably, the speed ratio of the main agitator to the auxiliary agitator is (4-6):1, and the speeds of the main agitator and the auxiliary agitator are adjusted according to the change in the equivalent diameter of the solid insoluble matter.

[0011] Preferably, the ratio of the cross-sectional area of ​​the main stirring zone to that of the secondary stirring zone is 1:(3-6).

[0012] Preferably, the upper end of the annular baffle is sealed and connected to the end cover of the closed tank body, and the mixed slurry / solution flows from the main stirring zone into the secondary stirring zone from the lower end of the annular baffle; the height of the annular baffle is 85% to 95% of the tangent height of the closed tank body.

[0013] Preferably, the liquid feed inlet and the solid feed inlet are correspondingly arranged on both sides of the stirring shaft of the main agitator along the diameter direction, and the liquid feed inlet and the solid feed inlet are located at 1 / 3 to 3 / 4 of the radius of the main stirring zone.

[0014] The present invention also discloses a solid-liquid mixing method of a multifunctional mixing tank, the solid-liquid mixing method comprising the following steps: Step 1: Add the solid material and liquid to be mixed into the main stirring zone of the closed tank through the solid feed port and the liquid feed port in proportion; Step 2: Start the main agitator and the auxiliary agitator in sequence, and the solid material and the liquid are quickly mixed in the main stirring zone, wherein the large particles in the solid material exceeding the target equivalent diameter sink to the bottom of the conical tank and are discharged through the slag discharge port; at the same time, the upper stirring blades flatten the solid material entering from the solid feed port in time as the stirring shaft rotates, and press the solid material into the mixed slurry / solution; when there is no powder accumulation below the solid feed port, the upper stirring blades idle without increasing energy consumption; Step 3: As stirring proceeds, the mixed slurry / solution presses the lower end of the annular partition into the auxiliary stirring zone. Under the stirring of the auxiliary agitator, the solid particles of the target equivalent diameter are kept suspended in the slurry / solution to prevent sinking. The solid particles larger than the target equivalent diameter continue to sink to the bottom of the conical tank in the opposite direction of the rising overflow of the mixed slurry / solution, and are discharged from the slag discharge port after merging with the solid particles sinking in the main stirring zone; the uniformly mixed slurry / solution overflows along the upper edge of the overflow retaining ring into the overflow trough and is continuously discharged through the overflow port. The overflow rate of the overflow trough is 150-260m³ / (m•d); Preferably, during the mixing process of steps 1 to 3, the solid-liquid mixing in the closed tank is observed through the observation port, and whether to open the nozzle for defoaming operation is determined according to demand; during the defoaming operation, the fluid entering the nozzle can be the same as the liquid flowing into the liquid feed port, or other low-viscosity inert liquids or gases that do not chemically react with the slurry / solution; when the foam is severe during the mixing process, the liquid entering the nozzle uses a liquid containing a defoaming agent.

[0015] Compared with the prior art, the present invention has at least the following beneficial effects: 1. The multifunctional solid-liquid mixing tank of the present invention can effectively control the amount of slurry / solution that needs to be quickly stirred, which can not only efficiently achieve uniform mixing of solid materials and liquids, but also effectively control the equivalent diameter of solid insolubles, and reduce the energy consumption of the stirring process; 2. The solid-liquid mixing tank can effectively separate non-target equivalent diameter particles by using the tank structure itself, avoiding the problem of pipeline blockage during subsequent transportation, which not only reduces the use of separation equipment, but also further reduces power energy consumption; 3. The solid-liquid mixing tank can effectively control the foam problem that occurs during the solid-liquid mixing process and avoid operational risks caused by liquid level distortion. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the structure of the multifunctional solid-liquid mixing tank of the present invention.

[0017] Figure numerals: 1. Closed tank body; 2. Conical tank bottom; 3. Slag discharge port; 4. Annular partition; 5. Main stirring zone; 6. Auxiliary stirring zone; 7. Main agitator; 8. Auxiliary agitator; 9. Stirring shaft; 10. Upper stirring blade; 11. Nozzle; 12. Observation port; 13. Liquid feed port; 14. Solid feed port; 15. Overflow retaining ring; 16. Overflow port. DETAILED DESCRIPTION

[0018] To make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the following will be combined with the attached Figure 1 The technical solutions of the embodiments of the present invention are described clearly and completely. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. All other embodiments obtained by ordinary technicians in this field based on the described embodiments of the present invention belong to the scope of protection of the present invention.

[0019] Example 1: Figure 1 As shown, the present invention discloses a multifunctional solid-liquid mixing tank, which includes a closed tank body 1 and a conical tank bottom 2 arranged at its lower end, and a slag discharge port 3 is arranged at the lower end of the conical tank bottom 2. Large particles in the solid material that exceed the target equivalent diameter sink into the conical tank bottom 2 and are discharged through the slag discharge port 3, thereby avoiding the precipitation and siltation of large particles of the mixed slurry / solution during transportation in subsequent processes, resulting in pipeline blockage.

[0020] An annular partition 4 is provided extending downward from the top in the closed tank body 1, and the annular partition 4 is arranged coaxially with the closed tank body 1. A main stirring zone 5 is formed in the annular partition 4, and a secondary stirring zone 6 is formed between the outer side of the annular partition 4 and the inner wall of the closed tank body 1, and the secondary stirring zone 6 is connected to the main stirring zone 5 through the lower end of the annular partition 4. Specifically, the upper end of the annular partition 4 is sealed and connected to the end cover of the closed tank body 1, and the top of the annular partition 4 realizes the isolation of the main stirring zone 5 and the secondary stirring zone 6, and the mixed slurry / solution flows from the main stirring zone 5 to the secondary stirring zone 6 from the lower end of the annular partition 4, so that the powder material can be quickly mixed with the slurry / solution in the main stirring zone 5 with limited space, and the solid material is prevented from directly floating on the surface of the slurry / solution to the overflow port 16 and flowing out, resulting in a decrease in mixing efficiency and quality. The height of the annular partition 4 is not less than 60% of the tangent height (effective height above the inverted cone) of the closed tank body 1, so as to ensure the residence time of the powder material in the main stirring zone 5 and improve the mixing effect. For powder materials, more preferably, the height of the annular partition 4 is 85% to 95% of the tangent height of the closed tank body 1, so as to obtain a better mixing effect.

[0021] The top of the closed tank body 1 is respectively provided with a main agitator 7 and a secondary agitator 8 extending to the main stirring zone 5 and the secondary agitator 8. The main agitator 7 stirs the mixed slurry / solution in the main stirring zone 5, and the secondary agitator 8 stirs the mixed slurry / solution in the secondary stirring zone 6. The ratio of the rotation speeds of the main agitator 7 and the secondary agitator 8 is (3-10):1, and the rotation speeds of the main agitator 7 and the secondary agitator 8 are adjusted according to the change of the equivalent diameter of the solid insoluble matter. This setting only requires the main agitator 7 in the main stirring zone 5 to rotate at a high speed to stir a small amount of mixed slurry / solution, so that the solid and liquid can be mixed quickly, avoiding stirring all the slurries / solutions and causing the agitator to consume a lot of electric energy; and the mixed slurry / solution entering the secondary stirring zone 6 only needs the secondary agitator 8 to stir at a low speed to maintain the particles of the target equivalent diameter in the mixed slurry / solution suspended in the slurry / solution, thereby achieving the overall energy saving effect of the stirring device. For powder materials, more preferably, the ratio of the rotation speeds of the main agitator 7 and the secondary agitator 8 is (4-6):1.

[0022] The ratio of the cross-sectional area of ​​the main stirring zone 5 to that of the auxiliary stirring zone 6 is 1:(2-8). This arrangement can not only reduce the volume of the main stirring zone 5 to improve the stirring efficiency of the main agitator 7, but also reduce the rising velocity of the mixed slurry / solution in the auxiliary stirring zone 6, so that large particles larger than the target equivalent diameter in the mixed slurry / solution can physically and completely sink to the bottom of the conical tank 2. For powder materials, more preferably, the ratio of the cross-sectional area of ​​the main stirring zone 5 to that of the auxiliary stirring zone 6 is 1:(3-6).

[0023] The stirring shaft 9 of the main agitator 7 is provided with at least two layers of stirring blades, the upper stirring blades 10 are 1 to 10 cm higher than the liquid level of the main stirring zone 5, and the diameter of the upper stirring blades 10 is sufficient for its rotational sweep area to completely cover the liquid surface area of ​​the main stirring zone; the upper stirring blades 10 will promptly flatten the solid materials entering from the solid feed port 14 as the stirring shaft 9 rotates, and press the solid materials into the mixed slurry / solution; when there is no powder accumulation below the solid feed port 14, the upper stirring blades 10 will idle without increasing energy consumption. More preferably, the upper stirring blades 10 are horizontally installed straight blades, which are 4 to 20 cm higher than the liquid level of the main stirring zone 5.

[0024] The inner wall of the closed tank body 1 is provided with an overflow retaining ring 15 along its circumference, and the longitudinal section of the overflow retaining ring 15 is an L-shaped structure, and an overflow groove is formed between the overflow retaining ring 15 and the inner wall of the closed tank body 1; the outer wall of the closed tank body 1 is provided with a plurality of overflow ports 16 connected to the overflow groove in the circumferential direction; and a clearance cavity is formed above the overflow retaining ring 15 in the closed tank body 1. After the mixed slurry / solution rises to the overflow retaining ring 15 along the auxiliary stirring zone 6, it flows into the overflow groove along the upper edge of the overflow retaining ring 15, and then flows out through the plurality of overflow ports 16. By controlling the control valves provided corresponding to the overflow ports 16, the flow rate of the overflow groove can be adjusted.

[0025] A liquid feed port 13 and a solid feed port 14 are provided at the top of the closed tank body 1 corresponding to the main stirring zone 5; the liquid feed port 13 and the solid feed port 14 are provided on both sides of the stirring shaft 9 of the main stirrer 7 along the diameter direction, and the liquid feed port 13 and the solid feed port 14 are located at 1 / 3 to 3 / 4 of the radius of the main stirring zone 5. The closed tank body 1 structure with this arrangement concentrates the feeding and liquid inlet in the main stirring zone 5, which can reduce the amount of slurry / solution stirred at high speed, thereby reducing energy consumption.

[0026] An observation port 12 is provided at the top of the closed tank body 1 corresponding to the main stirring zone 5 and the auxiliary stirring zone 6, through which the solid-liquid mixing condition in the mixing tank can be observed, and whether the nozzle 11 is opened for defoaming operation can be observed.

[0027] In a specific embodiment, a plurality of nozzles 11 are respectively arranged on the top of the closed tank body 1 corresponding to the main stirring zone 5 and the auxiliary stirring zone 6, and the plurality of nozzles 11 cover the liquid surface areas of the corresponding main stirring zone 5 and the auxiliary stirring zone 6 slurry / solution. This arrangement requires the deployment of more nozzles 11. In another embodiment, nozzles 11 are respectively arranged on the outer wall of the closed tank body 1 and the side wall of the annular partition 4 corresponding to the main stirring zone 5 and the auxiliary stirring zone 6, and the nozzles 11 are arranged 5 to 15 cm above the liquid level surface formed by the overflow retaining ring 15, and the nozzles 11 radially spray the fluid with defoaming function along the closed tank body 1. This arrangement method moves the foam on the surface of the slurry / solution by stirring, and only a small number of liquid nozzles are needed to achieve full coverage of the slurry / solution surface and dynamic elimination of foam. It should be noted that the above two arrangements of the nozzles 11 can be used in combination to obtain a better defoaming effect. During the defoaming process, the fluid sprayed by the nozzle 11 can be the same as the liquid flowing into the liquid feed port 13, or other low-viscosity inert liquid or gas that does not chemically react with the slurry / solution; when the foam is serious during the mixing process, the liquid entering the nozzle 11 is a liquid containing a defoaming agent; the nozzle 11 uses a spraying method to eliminate the foam that may be generated during the stirring process of the slurry / solution. For powder materials, it is more preferred to use a liquid consistent with the liquid feed port 13 for horizontal spraying defoaming.

[0028] Embodiment 2: The present invention also discloses a solid-liquid mixing method of a multifunctional mixing tank, the solid-liquid mixing method comprising the following steps: First, the solid material and liquid to be mixed are added to the main stirring zone 5 of the closed tank body 1 through the solid feed port 14 and the liquid feed port 13 in proportion. This setting can reduce the volume of the main stirring zone 5 to improve the stirring efficiency of the main agitator 7.

[0029] Secondly, the main agitator 7 and the auxiliary agitator 8 are started in sequence, and the solid material and the liquid are quickly mixed in the main stirring zone 5, wherein large particles in the solid material exceeding the target equivalent diameter sink to the bottom of the conical tank 2 and are discharged through the slag discharge port 3; at the same time, the upper stirring blade 10 flattens the solid material entering from the solid feed port 14 in time as the stirring shaft 9 rotates, and presses the solid material into the mixed slurry / solution; when there is no powder accumulation below the solid feed port 14, the upper stirring blade 10 idles without increasing energy consumption.

[0030] Again, as the stirring proceeds, the mixed slurry / solution presses the lower end of the annular partition 4 into the secondary stirring zone 6. Under the stirring of the secondary agitator 8, the solid particles of the target equivalent diameter are kept suspended in the slurry / solution to prevent sinking. The solid particles larger than the target equivalent diameter continue to sink to the bottom of the conical tank 2 in the opposite direction of the rising overflow of the mixed slurry / solution, and merge with the solid particles sinking in the main stirring zone 5 and are discharged from the slag discharge port 3. The uniformly mixed slurry / solution overflows along the upper edge of the overflow retaining ring 15 into the overflow trough and is continuously discharged through the overflow port 16. The overflow rate of the overflow trough is not more than 300m³ / (m•d), which can avoid the suction effect during the overflow process from entraining particulate materials of non-target equivalent diameters; for powder materials, more preferably, the overflow rate of the overflow trough is 150-260m³ / (m•d).

[0031] Finally, during the above mixing process, the solid-liquid mixing in the closed tank 1 is observed through the observation port 12, and it is decided whether to open the nozzle 11 for defoaming operation according to the demand; during the defoaming operation, the fluid entering the nozzle can be the same as the liquid flowing into the liquid feed port 13, or other low-viscosity inert liquid or gas that does not chemically react with the slurry / solution; when the foam is serious during the mixing process, the liquid entering the nozzle 11 can be a liquid containing a defoamer. If a defoaming solution containing a defoamer is used, conventional defoamer components can be used to achieve the purpose of defoaming.

[0032] In a specific embodiment, industrial-grade quicklime and water are added into the mixing tank from the solid feed port 14 and the liquid feed port 13 at a mass ratio of 2:8, respectively; wherein the industrial-grade quicklime contains about 1% of water-insoluble impurities larger than 20 mesh. In the main stirring zone 5, where the height of the annular partition 4 accounts for 90% of the tangent height of the closed tank body 1, after staying at a stirring speed of 200r / min for about 0.1 minute, it enters the secondary stirring zone 6 with a stirring speed of 30r / min, and the area ratio of the main stirring zone 5 to the secondary stirring zone 6 is 1:4. The mixed slurry / solution in the secondary stirring zone 6 flows out from the overflow retaining ring 15 into the overflow trough, and the overflow rate of the overflow trough is 160m³ / (m•d). The sediment of the conical tank bottom 2 of the closed tank body 1 is discharged from the slag discharge port 3 at a frequency of once a day. The mixing tank was operated continuously for 148 hours, and no powder was accumulated below the solid feed port 14, and the particle retention of the 20-mesh filter screen on the inlet pipe of the mixing slurry / solution pump was zero.

[0033] The above are preferred embodiments of the present invention. It should be pointed out that, for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as within the scope of protection of the present invention.

Claims

1. A multifunctional solid-liquid mixing tank, characterized in that: The mixing tank comprises a closed tank body (1) and a conical tank bottom (2) arranged at the lower end thereof, wherein a slag discharge port (3) is arranged at the lower end of the conical tank bottom (2); An annular baffle (4) is provided in the closed tank body (1) extending downward from the top, and the annular baffle (4) is arranged coaxially with the closed tank body (1); a main stirring zone (5) is formed in the annular baffle (4), and a secondary stirring zone (6) is formed between the outer side of the annular baffle (4) and the inner wall of the closed tank body (1); the secondary stirring zone (6) is connected to the main stirring zone (5) through the lower end of the annular baffle (4); The top of the closed tank body (1) is provided with a main agitator (7) and a secondary agitator (8) extending to the main agitation zone (5) and the secondary agitation zone (6), respectively; An overflow retaining ring (15) is arranged along the circumference of the inner wall of the closed tank body (1); the longitudinal section of the overflow retaining ring (15) is an L-shaped structure, and an overflow groove is formed between the overflow retaining ring (15) and the inner wall of the closed tank body (1); a plurality of overflow ports (16) connected to the overflow groove are arranged along the circumference of the outer wall of the closed tank body (1); a clear cavity is formed in the closed tank body (1) above the overflow retaining ring (15); The top of the closed tank body (1) is provided with a liquid feed inlet (13) and a solid feed inlet (14) corresponding to the main stirring zone (5); Observation ports (12) are provided at the top of the closed tank body (1) corresponding to the main stirring zone (5) and the auxiliary stirring zone (6).

2. The multifunctional solid-liquid mixing tank according to claim 1, characterized in that: The top of the closed tank body (1) is provided with a plurality of nozzles (11) corresponding to the main stirring zone (5) and the auxiliary stirring zone (6), and the plurality of nozzles (11) cover the liquid surface areas of the slurry / solution in the corresponding main stirring zone (5) and the auxiliary stirring zone (6); Or / and the outer wall of the closed tank body (1) and the side wall of the annular partition (4) are respectively provided with nozzles (11) corresponding to the main stirring zone (5) and the auxiliary stirring zone (6), and the nozzles (11) are arranged correspondingly at 5 to 15 cm above the liquid level surface formed by the overflow retaining ring (15), and the nozzles (11) spray the fluid with a defoaming function along the radial direction of the closed tank body (1).

3. The multifunctional solid-liquid mixing tank according to claim 1, characterized in that: The stirring shaft (9) of the main stirrer (7) is provided with at least two layers of stirring blades, the upper stirring blades (10) are 1 to 10 cm higher than the liquid level of the main stirring zone (5), and the diameter of the upper stirring blades (10) is sufficient for the rotational sweep area to completely cover the liquid surface area of ​​the main stirring zone.

4. The multifunctional solid-liquid mixing tank according to claim 3, characterized in that: The upper stirring blade (10) is a horizontally installed straight blade, which is 4 to 20 cm higher than the liquid level of the main stirring zone (5).

5. The multifunctional solid-liquid mixing tank according to claim 1, characterized in that: The ratio of the rotation speeds of the main stirrer (7) and the auxiliary stirrer (8) is (4-6):1, and the rotation speeds of the main stirrer (7) and the auxiliary stirrer (8) are adjusted according to the change in the equivalent diameter of the solid insoluble matter.

6. The multifunctional solid-liquid mixing tank according to claim 1, characterized in that: The ratio of the cross-sectional area of ​​the main stirring zone (5) to that of the secondary stirring zone (6) is 1:(3-6).

7. The multifunctional solid-liquid mixing tank according to claim 1, characterized in that: The upper end of the annular baffle (4) is sealedly connected to the end cover of the closed tank body (1), and the mixed slurry / solution flows from the lower end of the annular baffle (4) from the main stirring zone (5) to the secondary stirring zone (6); the height of the annular baffle (4) is 85% to 95% of the tangent height of the closed tank body (1).

8. The multifunctional solid-liquid mixing tank according to claim 1, characterized in that: The liquid feed inlet (13) and the solid feed inlet (14) are arranged correspondingly on both sides of the stirring shaft (9) of the main stirrer (7) along the diameter direction, and the liquid feed inlet (13) and the solid feed inlet (14) are located at 1 / 3 to 3 / 4 of the radius of the main stirring zone (5).

9. A solid-liquid mixing method using the multifunctional mixing tank as claimed in any one of claims 1 to 8, characterized in that: The solid-liquid mixing method comprises the following steps: Step 1: adding the solid material and liquid to be mixed into the main stirring zone (5) of the closed tank (1) through the solid feed inlet (14) and the liquid feed inlet (13) in proportion; Step 2: The main agitator (7) and the auxiliary agitator (8) are started in sequence, and the solid material and the liquid are quickly mixed in the main stirring zone (5), wherein large particles in the solid material exceeding the target equivalent diameter sink to the bottom of the conical tank (2) and are discharged through the slag discharge port (3); at the same time, the upper stirring blade (10) promptly flattens the solid material entering from the solid feed port (14) as the stirring shaft (9) rotates, and presses the solid material into the mixed slurry / solution; when there is no powder accumulation below the solid feed port (14), the upper stirring blade (10) idles without increasing energy consumption; Step 3: As stirring proceeds, the mixed slurry / solution presses the lower end of the annular baffle (4) into the secondary stirring zone (6). Under the stirring of the secondary agitator (8), solid particles of target equivalent diameter are kept suspended in the slurry / solution to prevent them from sinking. Solid particles larger than the target equivalent diameter continue to sink to the bottom of the conical tank (2) in the opposite direction to the rising overflow of the mixed slurry / solution, and are discharged from the slag discharge port (3) after merging with the solid particles sinking in the main stirring zone (5). The uniformly mixed slurry / solution overflows along the upper edge of the overflow retaining ring (15) into the overflow trough and is continuously discharged through the overflow port (16). The overflow rate of the overflow trough is 150 to 260 m³ / (m•d).

10. The solid-liquid mixing method of the multifunctional mixing tank according to claim 9, characterized in that: During the mixing process of steps 1 to 3, the solid-liquid mixing in the closed tank (1) is observed through the observation port (12), and it is determined whether to open the nozzle (11) to perform a defoaming operation according to the needs; during the defoaming operation, the fluid entering the nozzle can be the same as the liquid flowing into the liquid feed port (13), or other low-viscosity inert liquid or gas that does not chemically react with the slurry / solution; when the foam is serious during the mixing process, the liquid entering the nozzle (11) is a liquid containing a defoaming agent.

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