Stirring system for lithium iron phosphate slurry

Abstract

A stirring system for a lithium iron phosphate slurry, comprising: a first dispersing system formed by a first feeding mechanism (190), a second feeding mechanism (180), a first stirring tank (110), a homogenizing pump (130), and a first demagnetizing machine (120), and a second dispersing system formed by a second stirring tank (140), a driving pump (150), a second demagnetizing machine (160), a heat exchanger (170), and a grinding device (200). Material taking openings (201) located at different heights are formed in the second stirring tank (140); a material taking device takes materials from the material taking openings (201) and feeds the materials into particle size measurement devices for measurement, so as to measure the particle sizes of the materials at different heights; then, the particle size measurement devices send the measurement results to a remote controller (202); and the remote controller (202) calculates the variance of each measurement result, and controls the second stirring tank (140) to stop stirring when the variance is less than a preset threshold. Thus, the problem of energy waste caused by setting a fixed stirring time can be avoided.

Description

Lithium iron phosphate slurry mixing system Technical Field

[0001] The present application relates to a stirring system, and in particular to a lithium iron phosphate slurry stirring system. Background Art

[0002] With the development of industry and the rapid growth of energy consumption, pollution has become more and more serious. PM2.5 has become a hot topic. More and more people have begun to pay attention to the harm of air pollutants to health. Words such as "new energy vehicles" and "green transportation" have become the focus. Lithium iron phosphate has the advantages of being non-toxic, pollution-free, safe, widely available in raw materials, cheap, and long-lasting. It has become an ideal positive electrode material for the new generation of lithium-ion batteries.

[0003] Slurry mixing, which is to mix the raw materials of lithium iron phosphate and solvent in a mixer, is a key process in preparing lithium battery slurry. The quality of the slurry mixing has an important impact on the consistency, internal resistance and coating of the lithium battery and other processing performance.

[0004] Among them, the improvement of the energy loss of the output slurry of the lithium iron phosphate slurry stirring system is very important for improving the performance of the lithium iron phosphate slurry stirring system. Summary of the Invention

[0005] Some embodiments of the present application provide a lithium iron phosphate slurry stirring system, comprising: a first feeding mechanism, a second feeding mechanism, a first stirring tank, a homogenizing pump, a first demagnetizer, a second stirring tank, a driving pump, a second demagnetizer, a heat exchanger, and a grinding device;

[0006] The outlet of the first feeding mechanism is connected to the first inlet of the first stirring tank, the outlet of the second feeding mechanism is connected to the second inlet of the first stirring tank, the first outlet of the first stirring tank is connected to the inlet of the homogenizing pump, the outlet of the homogenizing pump is connected to the inlet of the first demagnetizer, and the outlet of the first demagnetizer is connected to the third inlet of the first stirring tank;

[0007] The second outlet of the first stirring tank is connected to the first inlet of the second stirring tank, the first outlet of the second stirring tank is connected to the inlet of the driving pump, the outlet of the driving pump is connected to the inlet of the second demagnetizer, the outlet of the second demagnetizer is connected to the inlet of the heat exchanger, the outlet of the heat exchanger is connected to the inlet of the grinding device, and the outlet of the grinding device is connected to the second inlet of the second stirring tank;

[0008] The second mixing tank is provided with a plurality of feeding ports, and each feeding port is located at a different height; each feeding port of the second mixing tank is also provided with a feeding device and a particle size detection device;

[0009] When the second stirring tank is stirring, the material taking port is opened at a preset periodic interval, so that the material taker takes material from the corresponding material taking port, and the particle size detection device at the material taking port performs particle size detection; each particle size detection device is communicatively connected to the remote controller, and the remote controller is used to receive the particle size detection results transmitted by each particle size detection device, and calculate the variance of multiple particle size detection results, and control the second stirring tank to stop stirring when the variance is less than a preset threshold value;

[0010] The grinding device includes a device body and a multi-stage separation device, wherein the device body includes a grinding element having a cavity therein, and the multi-stage separation device includes a separation cylinder and a solid-liquid separator, wherein the separation cylinder is located in the cavity;

[0011] The separation cylinder has a feed port at a first axial end, the feed port including a first feed port and a second feed port located in different directions of the separation cylinder;

[0012] The separation cylinder has a material conveying pipe in communication with one of the first feed port and the second feed port. The wall of the material conveying pipe has a through-port for material inlet and outlet. The end of the material conveying pipe extends toward the second end of the separation cylinder in the axial direction and forms a discharge port at the second end. The feed end of the solid-liquid separator is connected to the discharge port and is configured to perform solid-liquid separation on the material during sedimentation in the solid-liquid separator.

[0013] The inner wall of the separation cylinder is provided with a spiral groove arranged around the material conveying pipe, and the spiral groove is located between the feed port and the discharge port; the separation cylinder is constructed to rotate around its own axis relative to the solid-liquid separator, and the material entering the separation cylinder is separated by its own rotation and the spiral groove.

[0014] In some embodiments, the multi-stage separation device further includes a discharge pipe and a discharge drive member;

[0015] One end of the discharge pipe is arranged through the discharge port and is connected to the material conveying pipe, and the other end of the discharge pipe is connected to the feed end;

[0016] The discharge pipe is configured to rotate relative to the solid-liquid separator around the axial direction of the separation cylinder to drive the separation cylinder to rotate synchronously;

[0017] The discharge driving member is connected to the discharge pipe and is configured to drive the discharge pipe to rotate relative to the solid-liquid separator around the axial direction of the separation cylinder.

[0018] In some embodiments, the solid-liquid separator includes a settling tower and a connecting pipe connected to the top of the settling tower, and an end of the connecting pipe away from the settling tower forms a feed end;

[0019] The settling tower is constructed to separate the material from solid and liquid during the settling process of the material in the settling tower;

[0020] The top of the settling tower is connected to the connecting pipe, and the inner diameter of the bottom of the settling tower gradually decreases along the flow direction of the material;

[0021] The top of the sedimentation tower is provided with a liquid outlet for the liquid substance in the material to flow out, and the bottom of the sedimentation tower is provided with a discharge port for discharging the solid substance in the material.

[0022] In some embodiments, a channel for material to enter and exit is provided between the groove wall of the spiral groove and the material conveying pipe.

[0023] In some embodiments, the material conveying pipe includes at least two hollow tubes, and a through opening is provided on the wall of each tube;

[0024] At least two tubes are connected in sequence along the axial direction of the separation cylinder, and the through-holes on adjacent tubes are connected through a channel; the through-hole on the tube adjacent to the solid-liquid separator is arranged close to the end face of the discharge port.

[0025] In some embodiments, the diameter of the separation cylinder gradually decreases from the first end to the second end, and the diameter of the separation cylinder includes the outer diameter and the inner diameter of the separation cylinder.

[0026] In some embodiments, the separation cylinder includes a cylinder body and a material conveying pipe, the cylinder body is a hollow structure, and the cylinder diameter of the cylinder body gradually decreases from the first end to the second end;

[0027] The first feed port and the second feed port are located in different directions of the first end of the cylinder; the material conveying pipe is located in the cylinder and passes through the center of the second end of the cylinder.

[0028] In some embodiments, the cylinder includes a cylinder body, a feed end cover and a discharge end cover, wherein the feed end cover and the discharge end cover are provided at opposite ends of the cylinder body and are detachably connected to the cylinder body;

[0029] The first feed port and the second feed port are located in different directions of the feed end cover, one end of the material conveying pipe is connected to the feed end cover, and the other end of the material conveying pipe is passed through the center of the discharge end cover.

[0030] In some embodiments, the distance between the grinding element and the separation drum gradually increases from the first end to the second end of the separation drum.

[0031] The present application provides a lithium iron phosphate slurry stirring system, comprising a first feeding mechanism, a second feeding mechanism, a first stirring tank, a homogenizing pump, a first demagnetizer, a second stirring tank, a drive pump, a second demagnetizer, a heat exchanger, and a grinding device. The first feeding mechanism, the second feeding mechanism, the first stirring tank, the homogenizing pump, and the first demagnetizer form a first dispersion system. The second stirring tank, the drive pump, the second demagnetizer, the heat exchanger, and the grinding device form a second dispersion system. By opening feeding ports at different heights on the second stirring tank, a feeding device takes material from the second stirring tank and sends it to a particle size detection device for detection, thereby detecting the particle sizes of materials at different heights. Each particle size detection device then sends the detection results to a remote controller, which calculates the variance of each detection result and controls the second stirring tank to stop stirring when the variance is less than a preset threshold. This avoids the problem of energy waste caused by setting a fixed stirring time. The multi-stage separation device can perform three-stage separation on the material entering the multi-stage separation device to better separate the grinding medium and slurry in the material, thereby ensuring that the multi-stage separation device ultimately discharges the desired slurry. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following is a brief introduction to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0033] FIG1 is a schematic diagram of a lithium iron phosphate slurry stirring system provided in some embodiments of the present application;

[0034] FIG2 is a schematic structural diagram of a grinding device provided in an embodiment of the present application;

[0035] FIG3 is an internal schematic diagram of a multi-stage separation device provided in an embodiment of the present application;

[0036] FIG4 is a schematic structural diagram of a multi-stage separation device provided in an embodiment of the present application;

[0037] FIG5 is a schematic diagram of the external structure of a multi-stage separation device provided in an embodiment of the present application;

[0038] FIG6 is a partial schematic diagram of the interior of a dynamic mechanical seal structure provided in an embodiment of the present application;

[0039] FIG7 is a partial internal schematic diagram of a solid-liquid separator provided in an embodiment of the present application;

[0040] FIG8 is an enlarged view of portion A of FIG3;

[0041] FIG9 is an exploded view of the separation cylinder provided in an embodiment of the present application.

[0042] Description of reference numerals:

[0043] 100-multi-stage separation device; 1-separation cylinder; 11-first end; 111-first feed port; 112-second feed port; 12-second end; 121-discharge port; 13-cylinder body; 131-cylinder body; 1311-spiral groove; 1312-spiral protrusion; 132-feed end cap; 133-discharge end cap; 14-material conveying pipe; 141-through port; 142-first tube body; 143-second tube body; 15-channel;

[0044] 2-solid-liquid separator; 21-sedimentation tower; 211-liquid outlet; 212-discharge port; 22-connecting pipe; 221-feed end; 3-discharge pipe; 4-discharge drive member; 5-belt drive assembly; 6-frame;

[0045] 7-dynamic mechanical seal structure; 71-shaft sleeve; 72-gland; 721-static ring cavity; 73-dynamic ring; 74-static ring;

[0046] 200-grinding device; 210-grinding element; 2101-cavity; 201-feeding port; 202-remote controller;

[0047] 110 - first stirring tank; 120 - first demagnetizer; 130 - homogenizing pump; 140 - second stirring tank; 150 - driving pump; 160 - second demagnetizer; 170 - heat exchanger; 180 - second feeding mechanism; 190 - first feeding mechanism. DETAILED DESCRIPTION

[0048] In the related art, in order to ensure the uniformity of the slurry, an empirical time is usually set, and the mixing tank is stopped after stirring for a certain period of time. In this way, the mixing tank is still stirring even when the slurry has been stirred uniformly, resulting in energy waste.

[0049] To solve the above problems, some embodiments of the present application provide a lithium iron phosphate slurry stirring system. As shown in Figure 1, the lithium iron phosphate slurry stirring system includes a first feeding mechanism 190, a second feeding mechanism 180, a first stirring tank 110, a homogenizing pump 130, a first demagnetizer 120, a second stirring tank 140, a driving pump 150, a second demagnetizer 160, a heat exchanger 170 and a grinding device 200.

[0050] The outlet of the first feeding mechanism 190 is connected to the first inlet of the first stirring tank 110, the outlet of the second feeding mechanism 180 is connected to the second inlet of the first stirring tank 110, the first outlet of the first stirring tank 110 is connected to the inlet of the homogenizing pump 130, the outlet of the homogenizing pump 130 is connected to the inlet of the first demagnetizer 120, and the outlet of the first demagnetizer 120 is connected to the third inlet of the first stirring tank 110.

[0051] The second outlet of the first stirring tank 110 is connected to the first inlet of the second stirring tank 140, the first outlet of the second stirring tank 140 is connected to the inlet of the driving pump 150, the outlet of the driving pump 150 is connected to the inlet of the second demagnetizer 160, the outlet of the second demagnetizer 160 is connected to the inlet of the heat exchanger 170, the outlet of the heat exchanger 170 is connected to the inlet of the grinding device 200, and the outlet of the grinding device 200 is connected to the second inlet of the second stirring tank 140.

[0052] The first and second feeding mechanisms 190, 180 are used to feed lithium iron phosphate powder into the first mixing tank 110, and to inject solvent into the first mixing tank 110 through a pipe. The first mixing tank 110 is used to mix the lithium iron phosphate powder and the solvent. The mixed slurry is broken up by the homogenizing pump 130, demagnetized by the first demagnetizer 120, and then returned to the first mixing tank 110. After repeating this cycle a preset number of times, the slurry is cut by the homogenizing pump 130 to form a slurry with relatively small particle size.

[0053] Subsequently, the slurry in the first mixing tank 110 enters the second mixing tank 140. After the discharge port of the second mixing tank 140 is opened, the pump 150 is driven to extract the slurry from the second mixing tank 140, and the slurry passes through the second demagnetizer 160 and the heat exchanger 170 and enters the grinding device 200. After being ground in the grinding device 200, it returns to the second mixing tank 140. This process is repeated, and the slurry is ground by the grinding device 200 to form a slurry with smaller particle size.

[0054] Since the slurry will continue to return to the second stirring tank 140 in batches after being ground by the grinding device 200, the second stirring tank 140 continues to stir, stirring multiple batches of slurry to improve the uniformity of the slurry.

[0055] The first feeding mechanism 190, the second feeding mechanism 180, the first stirring tank 110, the homogenizing pump 130, and the first demagnetizer 120 form a first dispersion system. The second stirring tank 140, the drive pump 150, the second demagnetizer 160, the heat exchanger 170, and the grinding device 200 form a second dispersion system. The first and second dispersion systems can better disperse the lithium iron phosphate powder in the solvent, thereby improving the uniformity of the slurry formed by the mixture of the lithium iron phosphate powder and the solvent.

[0056] The second mixing tank 140 is provided with multiple discharging ports 201, each located at a different height. This allows for discharging of slurry from different layers within the second mixing tank 140. Each discharging port 201 of the second mixing tank 140 is also provided with a discharging device (not shown) and a particle size detection device (not shown). In other words, each discharging port 201 is provided with a corresponding discharging device and a particle size detection device.

[0057] When the second stirred tank 140 is stirred, the feeding port is opened at a preset period interval, so that the feeding device takes material from the corresponding feeding port 201 of the second stirred tank 140, and the material is transported to the particle size detection device, and the particle size detection device performs particle size detection. Each particle size detection device is connected to the remote controller 202 for communication. The remote controller 202 is used to receive the particle size detection results sent by multiple particle size detection devices, and performs variance calculation on multiple particle size detection results. When the variance is less than a preset threshold, the second stirred tank 140 is controlled to stop stirring, and when the variance is greater than or equal to the preset threshold, the second stirred tank 140 is controlled to continue stirring. Among them, the variance of each test result can detect the distribution of several test results. The smaller the variance, the more concentrated the test results, indicating that the difference between the test results is smaller, the uniformity is better, and there is no need to stir again. The larger the variance, the more dispersed the test results, indicating that the difference between the test results is larger, the uniformity is worse, and it is necessary to continue stirring.

[0058] In the above technical solution, by opening a feeding port 201 at different heights on the second stirring tank 140, a feeding device takes material from the second stirring tank 140 and sends it to the particle size detection device for detection, so as to detect the particle size of the material at different heights. Then, each particle size detection device sends the detection result to the remote controller 202, and the remote controller 202 calculates the variance of each detection result. When the variance is less than a preset threshold, the second stirring tank 140 is controlled to stop stirring. In this way, the problem of energy waste caused by setting a fixed stirring time can be avoided.

[0059] Grinding devices typically use grinding media to assist grinding. As the size of the grinding media decreases, higher demands for slurry fineness after grinding can be met. Grinding media can be zirconium beads or other materials suitable for grinding. As the size of the grinding media decreases, the mass of the grinding media also decreases. This can cause some of the grinding media to be entrained in the slurry and drawn into the separation device of the grinding device during the grinding process, significantly challenging the separation efficiency of the separation device.

[0060] The separation device of the existing grinding device generally adopts centrifugal separation, which cannot better separate the grinding medium and the slurry through centrifugal separation. As the viscosity of the slurry increases, part of the grinding medium will still be entrained in the slurry and move with the slurry in the grinding device, and cannot be well separated from the slurry. This will lead to a decrease in the uniformity of the slurry output by the lithium iron phosphate slurry stirring system.

[0061] In view of this, some embodiments of the present application further provide a grinding device 200 in which a multi-stage separation device is capable of performing three-stage separation on the material entering the multi-stage separation device, thereby better separating the grinding media and slurry in the material, and ensuring that the multi-stage separation device ultimately discharges the desired slurry. Compared to existing grinding devices 200, the grinding device 200 of the present application has a better separation effect on the grinding media and slurry, thereby improving the uniformity of the lithium iron phosphate slurry output by the lithium iron phosphate slurry stirring system.

[0062] The structures of the grinding device and the multi-stage separation device in the lithium iron phosphate slurry stirring system provided in the present application are further described below with reference to the accompanying drawings and examples.

[0063] As shown in Figure 2, the present application also provides a grinding device 200, which includes an equipment body and a multi-stage separation device 100. The equipment body includes a grinding piece 210, and the grinding piece 210 has a cavity 2101. The separation cylinder 1 of the multi-stage separation device 100 is located in the cavity 2101, so that after the material enters the grinding piece 210, it can enter the separation cylinder 1 to separate the material through the multi-stage separation device 100.

[0064] The apparatus may include a grinding motor and a grinding cylinder. The grinding element 210 is located within the grinding cylinder and forms a grinding chamber with the cylinder wall. The grinding motor's shaft extends into the grinding cylinder and connects to the grinding element 210, driving the grinding element 210 to rotate relative to the cylinder about the shaft. This allows the grinding media to grind the slurry entering the grinding chamber. After grinding the slurry in the grinding chamber, it can pass through the through-holes in the grinding element 210 and into the separation cylinder 1. Smaller grinding media may also be entrained by the slurry and enter the separation cylinder 1.

[0065] It should be noted that the device body can be understood as the structure within the grinding device 200 excluding the multi-stage separation device 100. In addition to the grinding motor and grinding cylinder, the device body may also include structures such as a diaphragm pump. For details, please refer to the structure of the existing grinding device 200 and will not be described in detail here. In this application, the structure of the device body is not further limited.

[0066] 2 and 3 , the distance between the grinding element 210 and the separation drum 1 gradually increases in the direction from the first end 11 to the second end 12 of the separation drum 1, so that when the grinding element 210 rotates, the slurry in the material can form a stable turbulence between the grinding element 210 and the separation drum 1, and the slurry can be subjected to an axial force along the axial direction of the separation drum 1, so that the slurry can be pushed in the discharge direction along the axial direction of the separation drum 1, thereby preventing the effective collision between the grinding medium and the slurry, which is beneficial to the separation of the grinding medium and the slurry.

[0067] Furthermore, along the direction from the first end 11 to the second end 12 of the separation cylinder 1, the inner diameter of the cavity 2101 of the grinding member 210 gradually increases, so that the interior of the grinding member 210 can form a conical cavity 2101 with a relatively rounded cavity wall, so that along the direction from the first end 11 to the second end 12 of the separation cylinder 1, the distance between the grinding member 210 and the separation cylinder 1 gradually increases.

[0068] It should be noted that the angle between the outermost edges of the conical cavity 2101 on both sides in the radial direction can be 7 degrees to 9 degrees. For example, the angle can be 7 degrees, 8 degrees, 9 degrees or other degrees that can enable the slurry to form stable turbulence, and no further limitation is given here.

[0069] As shown in Figure 3, the multi-stage separation device 100 includes a separation cylinder 1 and a solid-liquid separator 2. The separation cylinder 1 has a feed port on the first axial end 11. The feed port includes a first feed port 111 and a second feed port 112 located in different directions of the separation cylinder 1, so that the material can enter the separation cylinder 1 through at least one of the first feed port 111 and the second feed port 112.

[0070] As shown in FIG3 , in some embodiments, the first feed port 111 is located on the end surface of the separation drum 1, and the second feed port 112 is located circumferentially of the separation drum 1. Alternatively, in some embodiments, the second feed port 112 is located on the end surface of the separation drum 1, and the first feed port 111 is located circumferentially of the separation drum 1. In this application, the locations of the first feed port 111 and the second feed port 112 on the separation drum 1 are not further limited.

[0071] As shown in FIG3 , the separation drum 1 has a material conveying pipe 14 in the cavity that is connected to one of the first feed port 111 and the second feed port 112. The wall of the material conveying pipe 14 has a through-hole 141 for material flow, so that the material can enter and exit the material conveying pipe 14 through the through-hole 141. To prevent material blockage, the material conveying pipe 14 can be connected to the feed port located in the circumferential direction.

[0072] The structure of the multi-stage separation device 100 is further described below by taking the example that the first feed port 111 is located on the end surface of the separation cylinder 1 and the second feed port 112 is located in the circumference of the separation cylinder 1 .

[0073] The end of the material conveying pipe 14 extends toward the second axial end 12 of the separation cylinder 1, and forms a discharge port 121 at the second end 12. The feed end 221 of the solid-liquid separator 2 is connected to the discharge port 121, and is constructed to perform solid-liquid separation on the material during the sedimentation process in the solid-liquid separator 2.

[0074] As shown in Figure 3, the inner wall of the separation drum 1 has a spiral groove 1311 disposed around the material conveying pipe 14, and the spiral groove 1311 is located between the feed port and the discharge port 121. The separation drum 1 is configured to rotate about its own axial direction relative to the solid-liquid separator 2. This rotation and the spiral groove 1311 separate the material entering the separation drum 1, thereby achieving centrifugal and spiral separation of the material. This separates the grinding media entrained in the separation drum 1 from the slurry, allowing the separated grinding media to exit the separation drum 1.

[0075] The material can enter the material conveying pipe 14 through the first feed port 111 and then enter the separation drum 1. Alternatively, the material can enter the separation drum 1 simultaneously through the first feed port 111 and the second feed port 112. When the separation drum 1 rotates about its own axis relative to the solid-liquid separator 2, a certain centrifugal force is generated on the material. Under the action of the centrifugal force, the material in the material conveying pipe 14 will be thrown out of the material conveying pipe 14 through the through-port 141. Some heavy materials in the material will be directly thrown out of the separation drum 1 through the second feed port 112, or the material will be thrown into the spiral groove 1311.

[0076] Due to the arrangement of the spiral groove 1311 in the separation drum 1, and the spiral groove 1311 being located between the second feed port 112 and the discharge port 121, when the separation drum 1 rotates relative to the solid-liquid separator 2 about its own axial direction, the heavy matter in the material entering the spiral groove 1311 will be gathered at the bottom of the spiral groove 1311 under the action of centrifugal force, and move along the spiral groove 1311, and finally be thrown out of the separation drum 1 through the second feed port 112, while the remaining material will move along the axial direction of the material conveying pipe 14 toward the discharge port 121, and enter the material conveying pipe 14 through the next through-hole 141, so as to be transmitted to the solid-liquid separator 2 through the discharge pipe 3, thereby realizing the primary centrifugal separation and secondary spiral separation of the heavy matter and the light matter in the material in the separation drum 1. The light matter in the material is obtained after the separation drum 1 is processed.

[0077] When the first feed port 111 is blocked, the second feed port 112 can be used as a backup feed channel to ensure that the material can normally enter the separation cylinder 1 and ensure the normal use of the multi-stage separation device 100.

[0078] It should be noted that light matter can be understood as finer slurry or smaller grinding media. Heavy matter has a greater mass than light matter. Heavy matter can include powders that are unevenly dispersed in the slurry and larger grinding media entrained in the slurry.

[0079] It should be noted that the inner wall of the separation drum 1 has a spiral protrusion 1312 disposed around the material conveying pipe 14. The spiral protrusion 1312 and the inner wall of the separation drum 1 together form a spiral groove 1311. The bottom of the spiral groove 1311 can be understood as the end where the spiral protrusion 1312 connects to the inner wall of the separation drum 1. The spiral protrusion 1312 can form the groove wall of the spiral groove 1311. The spiral protrusion 1312 can be integrally connected to the inner wall of the separation drum 1 to enhance the connection strength between the spiral protrusion 1312 and the inner wall of the separation drum 1.

[0080] The spiral direction of the spiral groove 1311 can be the same as the rotation direction of the separation cylinder 1, so that the heavy matter moves along the spiral groove 1311 to one end of the spiral groove 1311 adjacent to the second feed port 112 under the action of centrifugal force, and is thrown out from the second feed port 112.

[0081] With the ground as a reference, the rotation direction of the separation drum 1 can be clockwise or counterclockwise. In the present application, the rotation direction of the separation drum 1 is not further limited.

[0082] On this basis, through the setting of the solid-liquid separator 2, the material (light material) separated by the separation cylinder 1 can flow out through the discharge port 121 and enter the feed end 221 of the solid-liquid separator 2, so that in the process of sedimentation in the solid-liquid separator 2, the extremely small grinding media entrained in the material can be sedimented and separated to better separate the solid and liquid substances in the material, and while obtaining the required liquid substance in the material, it can also facilitate the recovery of the solid substance.

[0083] It should be noted that the liquid substance can be understood as the slurry with a finer fineness required after separation in the material by the multi-stage separation device 100, and the solid substance can be understood as the grinding medium in the light substance that is entrained by the slurry into the solid-liquid separator 2.

[0084] Therefore, when the multi-stage separation device 100 is used in the grinding device 200, the first-stage centrifugal separation, the second-stage spiral separation, and the third-stage solid-liquid sedimentation separation of the multi-stage separation device 100 can meet the separation effect of the grinding medium by the grinding device 200 when the size of the grinding medium gradually decreases, so as to obtain a slurry with finer fineness. Referring to Figure 3, the multi-stage separation device 100 also includes a discharge pipe 3, one end of the discharge pipe 3 is passed through the discharge port 121 and communicates with the material conveying pipe 14, and the other end of the discharge pipe 3 is connected to the feed end 221, so that the material separated by the separation cylinder 1 can enter the material conveying pipe 14 through the discharge port 121, and enter the feed end 221 via the material conveying pipe 14, thereby realizing the sedimentation separation of the material in the solid-liquid separator 2.

[0085] The discharge pipe 3 is constructed to rotate around the axial direction of the separation cylinder 1 relative to the solid-liquid separator 2 to drive the separation cylinder 1 to rotate synchronously, so that when the discharge pipe 3 rotates, it can drive the separation cylinder 1 to rotate synchronously to achieve the first-level centrifugal separation and second-level spiral separation of the separation cylinder 1.

[0086] It should be noted that the synchronous rotation of the separation drum 1 can be understood as the separation drum 1, driven by the discharge pipe 3, rotating synchronously around its own axis and in the same rotation direction as the discharge pipe 3. The rotation direction of the discharge pipe 3 is the same as that of the separation drum 1. For details, please refer to the description of the rotation direction of the separation drum 1 above and will not be repeated here.

[0087] As shown in Figure 4, in some embodiments, the multi-stage separation device 100 also includes a discharge drive 4, which is connected to the discharge pipe 3 and is constructed to drive the discharge pipe 3 to rotate around the axial direction of the separation cylinder 1 relative to the solid-liquid separator 2, so that the discharge pipe 3 can rotate around the axial direction of the separation cylinder 1 relative to the solid-liquid separator 2 under the drive of the discharge drive 4, and drive the separation cylinder 1 to rotate synchronously.

[0088] The discharge drive 4 may include a motor or other structure capable of rotating the discharge tube 3. The structure of the discharge drive 4 is not further defined in this application. Taking the motor as an example, the discharge tube 3 may be connected to the discharge tube 3 via a belt drive assembly 5, so that when the motor is activated, the belt drive assembly 5 can drive the discharge tube 3 to rotate. It should be noted that the belt drive assembly 5 of the motor is a conventional transmission structure in the art, and the structure of the belt drive assembly 5 is not further described in this application.

[0089] As shown in FIG4 , the multi-stage separation device 100 further includes a frame 6. The discharge pipe 3 can be disposed on one side of the frame 6. The belt drive assembly 5 is located within the frame 6, and a pulley on one side of the belt drive assembly 5 is sleeved on the circumferential outer wall of the discharge pipe 3. The discharge drive member 4 can be located outside the frame 6 and connected to the pulley on the other side of the belt drive assembly 5 to secure the discharge pipe 3, the belt drive assembly 5, and the discharge drive member 4 to the frame 6.

[0090] It should be noted that part of the structure of the frame 6 is hidden in FIG. 4 to facilitate understanding of the connection between the discharge pipe 3 and the discharge drive member 4 .

[0091] As shown in Figures 4 and 5 , the separation drum 1 and the solid-liquid separator 2 can be located at both ends of the discharge pipe 3 in the axial direction and outside the frame 6. For example, the separation drum 1 and the discharge drive 4 can be located on the same side of the frame 6. In this application, the positions of the separation drum 1, the solid-liquid separator 2, and the discharge drive 4 relative to the frame 6 are not further limited.

[0092] 4 , the discharge pipe 3 can be dynamically mechanically sealed with the feed end 221 of the solid-liquid separator 2 so as to achieve a sealed connection between the discharge pipe 3 and the separation cylinder 1 and the solid-liquid separator 2 without affecting the rotation of the discharge pipe 3 .

[0093] As shown in Figure 3, the multi-stage separation device 100 also includes a dynamic mechanical sealing structure 7, which can be mounted on the end of the discharge pipe 3 so that the dynamic mechanical sealing structure 7 can realize the dynamic mechanical sealing between the discharge pipe 3 and the feed end 221 of the solid-liquid separator 2.

[0094] It should be noted that the dynamic mechanical sealing structure 7 is a conventional sealing structure in the art, and in this application, the structure of the dynamic mechanical sealing structure 7 is not further limited.

[0095] Furthermore, Figure 6 shows an internal schematic diagram of a dynamic mechanical seal structure 7. The dynamic mechanical seal structure 7 includes a sleeve 71, a pressure cover 72, two dynamic rings 73 and two static rings 74. The sleeve 71 is sleeved on the circumferential outer side of the discharge pipe 3. The two dynamic rings 73 are arranged at both ends of the axial direction of the sleeve 71 and rotate synchronously with the discharge pipe 3 together with the sleeve 71. The pressure cover 72 is sleeved on the circumferential outer side of the sleeve 71 and is located between the two dynamic rings 73 and is stationary relative to the sleeve 71. The pressure cover 72 is provided with a static ring cavity 721 on one side of the two dynamic rings 73. The two static rings 74 are respectively located in a static ring cavity 721 and are elastically connected to the pressure cover 72. The end faces of the static rings 74 and the dynamic rings 73 on both sides of the pressure cover 72 are in close contact with each other and are liquid-sealed. During the movement of dynamic ring 73, due to the elastic connection between static ring 74 and gland 72, static ring 74 moves synchronously with dynamic ring 73 and always maintains close contact with the end surface of dynamic ring 73, forming a liquid dynamic seal. The specific sealing principle of dynamic mechanical seal structure 7 can be found in the description of existing related art and will not be further elaborated here.

[0096] The end of the discharge pipe 3 can be inserted into the feed end 221 of the solid-liquid separator 2, the sleeve 71 of the dynamic mechanical seal structure 7 can be sleeved on the circumferential outer side of the discharge pipe 3, the dynamic ring 73 can be connected to the discharge pipe 3 through the sleeve 71, and the pressure cover 72 can be connected to the inner wall of the solid-liquid separator 2 at the feed end 221, thereby forming a dynamic mechanical seal between the discharge pipe 3 and the feed end 221 of the solid-liquid separator 2.

[0097] As shown in Figure 5, the solid-liquid separator 2 includes a sedimentation tower 21 and a connecting pipe 22 connected to the top of the sedimentation tower 21. The end of the connecting pipe 22 away from the sedimentation tower 21 forms a feed end 221. The sedimentation tower 21 is constructed to perform solid-liquid separation on the material during the sedimentation process of the material in the sedimentation tower 21. In this way, the solid-liquid separator 2 can achieve communication between the discharge pipe 3 and the top of the sedimentation tower 21 through the connecting pipe 22, so that the material can enter the sedimentation tower 21 through the discharge pipe 3 and the connecting pipe 22 in turn, and undergo sedimentation separation in the sedimentation tower 21, thereby sedimenting and separating the extremely small grinding media entrained in the material, so as to better separate the solid and liquid substances in the material.

[0098] As shown in FIG7 , the top of the settling tower 21 is connected to the connecting pipe 22, and the inner diameter of the bottom of the settling tower 21 gradually decreases along the flow direction of the material. As the light material in the material gradually settles in the settling tower 21, the solid material in the light material (such as smaller grinding media) will contact the tower wall of the settling tower 21, and the speed will gradually decrease and settle until it settles to the bottom of the settling tower 21, facilitating the discharge of the solid material. At the same time, the liquid material in the light material will move toward the top of the settling tower 21 so that the liquid material can be discharged from the top of the settling tower 21, thereby achieving effective separation of the solid and liquid materials in the light material.

[0099] The top of the settling tower 21 is provided with a liquid outlet 211 for the liquid substance in the material to flow out, so that the liquid substance is discharged from the liquid outlet 211 .

[0100] It should be noted that, under the pressure of the diaphragm pump of the grinding device 200, the material can enter the connecting pipe 22 through the discharge pipe 3, and the liquid material is urged to move toward the liquid outlet 211. The liquid material flowing out of the liquid outlet 211 can be stored in the storage tank of the grinding device 200. The liquid material in the storage tank can also be re-entered into the grinding chamber of the grinding device 200 for re-grinding to further improve the fineness and uniformity of the slurry, until the fineness of the slurry meets the requirements of lithium iron phosphate slurry.

[0101] As shown in FIG5 , the bottom end of the settling tower 21 has a discharge port 212 for discharging solid matter from the material, so that the solid matter can be discharged from the discharge port 212. A valve body is also provided at the bottom end of the settling tower 21 to control the opening and closing of the discharge port 212. The valve body may include, but is not limited to, a ball valve or other valve body structure. In this application, the number of valve bodies is not further limited.

[0102] As shown in FIG8 , a channel 15 for material inlet and outlet is provided between the groove wall of the spiral groove 1311 and the material conveying pipe 14 , so that during the rotation of the separation cylinder 1 , the material can pass through the channel 15 and move toward one side of the discharge pipe 3 .

[0103] As shown in Figure 8 , the material conveying pipe 14 comprises at least two hollow tubes, each having a through-hole 141 formed in its wall. The at least two tubes are sequentially connected along the axial direction of the separator drum 1. The through-holes 141 on adjacent tubes are connected via a channel 15, allowing material to flow through the material conveying pipe 14 while reducing the length requirement for each tube in the separator drum 1, thereby lowering the manufacturing cost of the separator drum 1.

[0104] The through hole 141 may be a circular hole, a square hole or an opening structure of other shapes for materials to enter and exit. In the present application, the structure of the through hole 141 is not further limited.

[0105] The number of tubes may be two, three or more. In this application, the number of tubes is not further limited.

[0106] The structure of the multi-stage separation device 100 is further described below by taking two tubes as an example.

[0107] For the convenience of description, the two tube bodies are defined as the first tube body 142 and the second tube body 143 respectively. Along the axial direction of the material conveying pipe 14, there is a distance between the second feed ports 112 of the first tube body 142 and the second tube body 143, so that when the separation cylinder 1 rotates and the material moves along the axial direction of the material conveying pipe 14, it can enter and exit the material conveying pipe through the second feed port 112 on the first tube body 142 and the second feed port 112 on the second tube body 143, so that the material moves toward the discharge port 121, which is conducive to increasing the movement path of the material in the spiral groove 1311, thereby improving the efficiency of spiral separation of the material.

[0108] Specifically, as the separation drum 1 rotates, the material within the first tube body 142 passes through the through-portion 141 under the action of centrifugal force. Some heavy materials in the material are either directly ejected from the separation drum 1 through the second feed port 112, or the entire material is ejected into the spiral groove 1311. Some of the heavy materials within the spiral groove 1311 move along the bottom of the spiral groove 1311 under the action of centrifugal force, ultimately ejecting the separation drum 1 through the second feed port 112. The remaining material passes through the channel 15 between the wall of the spiral groove 1311 and the material conveying pipe 14, moving axially along the material conveying pipe 14. It then enters the second tube body 143 through the through-portion 141 in the second tube body 143 and continues to move axially along the material conveying pipe 14.

[0109] During or after the material enters the second tube body 143, the heavy materials in the remaining material will continue to be thrown to the bottom of the spiral groove 1311 and move along the spiral groove 1311 until they are thrown out of the separation drum 1 through the second feed inlet 112, thereby achieving primary centrifugal separation and secondary spiral separation of the heavy and light materials in the material. After being processed in the separation drum 1, the material can be sequentially passed into the discharge pipe 3 and the solid-liquid separator 2 for sedimentation separation in the solid-liquid separator 2, completely removing the extremely small grinding media entrained in the light materials and obtaining the desired liquid material from the material.

[0110] Among them, the through hole 141 on the tube body (second tube body 143) adjacent to the solid-liquid separator 2 is set close to the end face of the discharge port 121 to increase the movement path of the material thrown into the spiral groove 1311 through the through hole 141 in the spiral groove 1311, thereby improving the efficiency of spiral separation of the material.

[0111] It should be noted that, in some embodiments, the material conveying pipe 14 may also be formed by a single pipe body.

[0112] As shown in Figure 8 , the diameter of the separator drum 1 at the first end 11 is larger than the diameter at the second end 12. The diameter of the separator drum 1 includes both the outer diameter and the inner diameter of the separator drum 1. In other words, the outer diameter and the inner diameter of the separator drum 1 at the first end 11 are both larger than the outer diameter and the inner diameter of the second end 12. This allows the separator drum 1 to push the material along its own axial direction and in the discharge direction when it rotates. The discharge direction can be understood as the direction of the discharge port 121.

[0113] To ensure that the diameter of the separation cylinder 1 at the first end 11 is greater than the diameter of the second end 12, in some embodiments, the diameter of the separation cylinder 1 gradually decreases from the first end 11 to the second end 12, so that the diameter of the separation cylinder 1 meets the above requirements while the separation cylinder 1 can also form a conical cylinder with a relatively rounded cylinder wall, and the wall thickness of the conical cylinder along its own axial direction is equal, so that when the separation cylinder 1 rotates, the slurry in the material can be subjected to an axial force, so that the slurry in the material can form a stable turbulence in the separation cylinder 1, so as to push the slurry along its own axial direction and the material in the discharge direction, while preventing the effective collision between the grinding medium and the slurry, which is conducive to the separation of the grinding medium and the slurry.

[0114] The angle between the outermost edges of the separation drum 1 on both sides in the radial direction can be 3 to 5 degrees. For example, the angle can be 3, 4, 5, or other degrees that can form a stable turbulent flow of the slurry. In this application, the angle of the separation drum 1 is not further limited.

[0115] It should be noted that, in the present application, to ensure that the diameter of the separation cylinder 1 at the first end 11 is greater than the diameter of the second end 12, the separation cylinder 1 may also adopt other shapes, for example, the separation cylinder 1 may also adopt a stepped shape. In the present application, there is no further limitation on the shape of the separation cylinder 1, as long as the diameter of the separation cylinder 1 at the first end 11 is greater than the diameter of the second end 12.

[0116] The structure of the multi-stage separation device 100 is further described below using a conical cylinder as an example.

[0117] 8 , the separation cylinder 1 includes a cylinder body 13 and a material conveying pipe 14 . The cylinder body 13 is a hollow structure. The diameter of the cylinder body 13 gradually decreases from the first end 11 to the second end 12 to form a tapered cylinder.

[0118] The first feed port 111 and the second feed port 112 are located in different directions at the first end 11 of the cylinder 13, so that the first feed port 111 can be located at the center of the end surface of the separation cylinder 1 at the first end 11, and the second feed port 112 can be located circumferentially of the separation cylinder 1 at the first end 11. The material conveying pipe 14 is located within the cylinder 13 and extends through the center of the second end 12 of the cylinder 13. This ensures that the material conveying pipe 14 is connected to the first feed port 111 while forming a discharge port 121 at the second end 12 of the separation cylinder 1.

[0119] It should be noted that the center in this application refers to the geometric center. For example, the center of the end surface of the separation cylinder 1 at the first end 11 mainly refers to the geometric center of the end surface of the separation cylinder 1 at the first end 11.

[0120] Referring to Figures 8 and 9, the barrel 13 includes a barrel body 131, a feed end cover 132, and a discharge end cover 133. The feed end cover 132 and the discharge end cover 133 are covered at opposite ends of the barrel body 131 and are detachably connected to the barrel body 131, so as to facilitate the processing of the separation barrel 1 and the replacement of part of the structure while forming the barrel body 13. The feed end cover 132 and the discharge end cover 133 can be detachably connected to the barrel body 131 by at least one of a snap connection and a fastener. The fastener can include but is not limited to screws, bolts, or studs. In the present application, the connection method of the feed end cover 132 and the discharge end cover 133 to the barrel body 131 is not further limited.

[0121] The first feed port 111 and the second feed port 112 are located in different directions of the feed end cover 132. For example, the first feed port 111 can be located on the end surface of the feed end cover 132, and the second feed port 112 can be located circumferentially of the feed end cover 132. One end of the material conveying pipe 14 is connected to the feed end cover 132, and the other end of the material conveying pipe 14 is inserted through the center of the discharge end cover 133. This allows the first feed port 111 and the second feed port 112 to be formed on the cylinder 13 while enabling the material conveying pipe 14 to be disposed within the cylinder 13.

[0122] It should be noted that when the material conveying pipe 14 includes two tubes, one tube can be disposed at the first feed port 111 of the feed end cap 132 and integrally connected to the feed end cap 132. The discharge end cap 133 has a through hole at its center, and the other tube can be passed through the through hole and integrally connected to the discharge end cap 133. When the feed end cap 132 and the discharge end cap 133 are assembled on the barrel 131 and connected to the barrel 131, the adjacent ends of the two tubes are plugged into each other to form the material conveying pipe 14.

[0123] In the above technical solution, through the arrangement of the separation cylinder 1 in the multi-stage separation device 100, due to the arrangement of the first feed port 111, the second feed port 112 in the separation cylinder 1 and the through-hole 141 on the material conveying pipe 14, when the separation cylinder 1 rotates around its own axial direction relative to the solid-liquid separator 2 in the multi-stage separation device 100, the material can enter the separation cylinder 1 through at least one of the first feed port 111 and the second feed port 112, so that the material will be thrown into the spiral groove 1311 through the through-hole 141 under the action of centrifugal force. Due to the arrangement of the spiral groove 1311 in the separation cylinder 1, when the separation cylinder 1 rotates about its own axis relative to the solid-liquid separator 2 in the multi-stage separation device 100, the heavy matter in the material entering the spiral groove 1312 will be gathered at the bottom of the spiral groove 1312 under the action of centrifugal force, and move along the spiral groove 1312, and finally be thrown out of the separation cylinder 1 through the feed port located in the circumference of the separation cylinder 1, so as to achieve the first-level centrifugal separation and second-level spiral separation of the heavy matter and light matter in the material in the separation cylinder 1. On this basis, through the arrangement of the solid-liquid separator 2, the material processed by the separation cylinder 1 can be separated and settled again to achieve the third-level solid-liquid sedimentation separation of the material, so as to better separate the liquid matter and solid matter in the material, so that the multi-stage separation device 100 has a higher separation efficiency for the material. Therefore, when the multi-stage separation device 100 is used in the grinding device 200, it can meet the separation effect of the grinding medium of the grinding device 200 when the size of the grinding medium is gradually reduced.

[0124] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application.

[0125] In the description of this application, it should be understood that the terms "including" and "having" and any variations thereof used herein are intended to cover non-exclusive inclusions. For example, a process, method, display structure, product or apparatus that includes a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units that are not explicitly listed or are inherent to these processes, methods, products or apparatuses.

[0126] Unless otherwise expressly specified or limited, the terms "mounted," "connected," "connected," "fixed," etc. should be interpreted broadly. For example, they can refer to fixed connections, removable connections, or integration. They can be directly connected or indirectly connected through an intermediate medium, allowing internal communication between two elements or an interaction between two elements. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances. In addition, the terms "first," "second," etc. are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of the technical features indicated.

[0127] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A lithium iron phosphate slurry stirring system, characterized in that: include: A first feeding mechanism, a second feeding mechanism, a first stirring tank, a homogenizing pump, a first demagnetizer, a second stirring tank, a driving pump, a second demagnetizer, a heat exchanger and a grinding device; The outlet of the first feeding mechanism is connected to the first inlet of the first stirring tank, the outlet of the second feeding mechanism is connected to the second inlet of the first stirring tank, the first outlet of the first stirring tank is connected to the inlet of the homogenizing pump, the outlet of the homogenizing pump is connected to the inlet of the first demagnetizer, and the outlet of the first demagnetizer is connected to the third inlet of the first stirring tank; The second outlet of the first stirring tank is connected to the first inlet of the second stirring tank, the first outlet of the second stirring tank is connected to the inlet of the driving pump, the outlet of the driving pump is connected to the inlet of the second demagnetizer, the outlet of the second demagnetizer is connected to the inlet of the heat exchanger, the outlet of the heat exchanger is connected to the inlet of the grinding device, and the outlet of the grinding device is connected to the second inlet of the second stirring tank; The second mixing tank is provided with a plurality of feeding ports, and each feeding port is located at a different height; each feeding port of the second mixing tank is also provided with a feeding device and a particle size detection device; When the second stirring tank is stirring, the material taking port is opened at a preset periodic interval, so that the material taking device takes material from the corresponding material taking port, and the particle size detection device at the material taking port performs particle size detection; each particle size detection device is communicatively connected to a remote controller, and the remote controller is used to receive the particle size detection results transmitted by each particle size detection device, and perform variance calculation on a plurality of the particle size detection results, and control the second stirring tank to stop stirring when the variance is less than a preset threshold value; The grinding device comprises a device body and a multi-stage separation device, wherein the device body comprises a grinding piece having a cavity therein, and the multi-stage separation device comprises a separation cylinder and a solid-liquid separator, wherein the separation cylinder is located in the cavity; The separation cylinder has a feed port at a first axial end, and the feed port includes a first feed port and a second feed port located in different directions of the separation cylinder; The separation cylinder has a material conveying pipe in communication with one of the first feed port and the second feed port, the wall of the material conveying pipe has a through port for material in and out, the end of the material conveying pipe extends toward the second end of the separation cylinder in the axial direction, and forms a discharge port at the second end; the feed end of the solid-liquid separator is in communication with the discharge port, and is configured to perform solid-liquid separation on the material during the sedimentation process of the material in the solid-liquid separator; The inner wall of the separation cylinder is provided with a spiral groove arranged around the material conveying pipe, and the spiral groove is located between the feed port and the discharge port; the separation cylinder is constructed to rotate around its own axial direction relative to the solid-liquid separator, and the material entering the separation cylinder is separated by its own rotation and the spiral groove.

2. The slurry stirring system according to claim 1, characterized in that: The multi-stage separation device also includes a discharge pipe and a discharge drive member; One end of the discharge pipe is disposed through the discharge port and communicated with the material conveying pipe, and the other end of the discharge pipe is communicated with the feed end; The discharge pipe is configured to rotate relative to the solid-liquid separator around the axial direction of the separation cylinder to drive the separation cylinder to rotate synchronously; The discharge driving member is connected to the discharge pipe and is configured to drive the discharge pipe to rotate relative to the solid-liquid separator around the axial direction of the separation cylinder.

3. The slurry stirring system according to claim 1, characterized in that: The solid-liquid separator comprises a settling tower and a connecting pipe connected to the top of the settling tower, and one end of the connecting pipe away from the settling tower forms the feeding end; The settling tower is configured to perform solid-liquid separation on the material during the settling process of the material in the settling tower; The inner diameter of the bottom end of the settling tower gradually decreases along the flow direction of the material; The top of the sedimentation tower is provided with a liquid outlet for the liquid substance in the material to flow out, and the bottom of the sedimentation tower is provided with a discharge port for discharging the solid substance in the material.

4. The slurry stirring system according to any one of claims 1 to 3, characterized in that: A channel for the material to enter and exit is provided between the groove wall of the spiral groove and the material conveying pipe.

5. The slurry stirring system according to claim 4, characterized in that: The material conveying pipe comprises at least two hollow pipe bodies, and the through opening is provided on the pipe wall of each of the pipe bodies; At least two tube bodies are connected in sequence along the axial direction of the separation cylinder, and the through-holes located on adjacent tube bodies are connected through the channel; the through-hole on the tube body adjacent to the solid-liquid separator is arranged close to the end face of the discharge port.

6. The slurry stirring system according to any one of claims 1 to 3, characterized in that: The diameter of the separation cylinder gradually decreases in a direction from the first end to the second end, and the diameter of the separation cylinder includes an outer diameter and an inner diameter of the separation cylinder.

7. The slurry stirring system according to claim 6, characterized in that: The separation cylinder comprises a cylinder body and a material conveying pipe, the cylinder body is a hollow structure, and the cylinder diameter of the cylinder body gradually decreases in the direction from the first end to the second end; The first feed inlet and the second feed inlet are located in different directions of the cylinder at the first end; the material conveying pipe is located in the cylinder and passes through the center of the cylinder at the second end.

8. The slurry stirring system according to claim 7, characterized in that: The cylinder body comprises a cylinder body, a feed end cover and a discharge end cover, wherein the feed end cover and the discharge end cover are arranged at two opposite ends of the cylinder body and are detachably connected to the cylinder body; The first feed port and the second feed port are located in different directions of the feed end cover, one end of the material conveying pipe is connected to the feed end cover, and the other end of the material conveying pipe is passed through the center of the discharge end cover.

9. The slurry stirring system according to any one of claims 1 to 3, characterized in that: Along the direction from the first end to the second end, the distance between the grinding element and the separation cylinder gradually increases.

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