Concentration apparatus and concentration method

Abstract

This invention discloses a concentration apparatus and a concentration method. The concentration apparatus includes a housing and further includes: an overflow mechanism for discharging the supernatant from the liquid within the housing; the overflow mechanism has an overflow port on the housing; a filtration mechanism for filtering the liquid within the housing; the filtration mechanism has a filter element within the housing and an outlet pipe for discharging the filtered liquid from the housing; a suction mechanism for extracting the concentrated liquid from the housing; the suction mechanism has a suction port on the housing; and a feeding mechanism for feeding the liquid to be concentrated into the housing; the feeding mechanism has a feed port on the housing. The overflow mechanism, filtration mechanism, suction mechanism, and feeding mechanism are arranged at intervals from top to bottom within the housing. This invention, by cleverly combining filtration and overflow, enables the concentration process to operate stably, significantly improving concentration efficiency and possessing strong practicality.

Description

Technical Field

[0001] This invention relates to the technical field of liquid concentration, and more specifically, to a concentration apparatus and a concentration method. Background Technology

[0002] In the production of some cathode materials such as cobalt carbonate, the feed solution needs to be concentrated. When the particulate matter concentration in the feed solution is low, filtration is required for concentration. However, as the particulate matter concentration increases, the filter cake formation rate accelerates, and the concentration efficiency decreases significantly. Furthermore, because cobalt carbonate particles are easily damaged, it is not advisable to use a mixer to stir the removed filter cake, as this can easily lead to the breakage of the cobalt carbonate particles. Summary of the Invention

[0003] The first objective of this invention is to provide a concentration apparatus and a concentration method to solve the technical problem of low concentration efficiency caused by simple filter cartridge filtration in the prior art.

[0004] The concentration device includes a housing and also includes:

[0005] An overflow mechanism is used to discharge the supernatant from the liquid inside the housing; the overflow mechanism has an overflow port on the housing;

[0006] A filtration mechanism is used to filter and concentrate the liquid inside the housing; the filtration mechanism has a filter element disposed inside the housing and an outlet pipe for discharging the filtrate filtered by the filter element out of the housing;

[0007] A material extraction mechanism is used to extract the concentrated liquid from the shell; the material extraction mechanism has an extraction port provided on the shell;

[0008] A feeding mechanism is used to deliver the liquid to be concentrated into the shell; the feeding mechanism has a feeding port provided on the shell;

[0009] The overflow mechanism, filtration mechanism, material extraction mechanism, and feeding mechanism are arranged at intervals from top to bottom inside the housing.

[0010] As a further improvement to the above-mentioned concentration device: the cross-section of the end cap at the lower end of the shell decreases from top to bottom, the extraction port is located above the end cap, and the feed port is located at the bottom of the end cap; it also includes a stirring mechanism, which includes a spray pipe located inside the end cap and spraying liquid into the end cap; the extraction mechanism also includes an extraction pipe connected to the extraction port, and the inlet of the extraction pipe faces the bottom of the end cap.

[0011] As a further improvement to the above-mentioned concentration device: the material extraction mechanism also includes an anti-clogging cover at the inlet of the material extraction pipe; the spray pipe is connected to the material extraction pipe; the stirring mechanism includes two sets of spray pipes symmetrically arranged along the axial direction of the shell, the two sets of spray pipes are inclined downward and the outlets are arranged opposite each other.

[0012] As a further improvement to the above-mentioned concentration device: the overflow mechanism includes an overflow groove arranged circumferentially along the inner wall of the housing, the overflow groove is provided with an overflow notch, and the overflow groove is connected to the overflow port.

[0013] As a further improvement to the above-mentioned concentration device, it also includes a backflushing mechanism for blowing off the filter cake adhering to the surface of the filter element. The backflushing mechanism includes a backflushing medium conveying pipe, and the backflushing medium conveying pipe and the discharge pipe are connected to the main pipeline at the upper or lower end of the filter element respectively through valves.

[0014] As a further improvement to the above-mentioned concentration device, it also includes a pressure regulating mechanism for adjusting the pressure inside the housing, the pressure regulating mechanism including a vent and a pressure gauge disposed on the housing.

[0015] As a further improvement to the above-mentioned concentration device, a rinsing mechanism is also included, which is used to rinse the inside of the housing, and the rinsing mechanism includes a spray assembly located on the top of the housing.

[0016] As a further improvement to the above-mentioned concentration device, a control mechanism is also included, which is used to control the start and stop of the filtration mechanism and the overflow mechanism. The control mechanism includes a level gauge and a concentration detector for detecting the particulate matter concentration of the feed liquid, both located within the housing.

[0017] The concentration method, which uses the above-mentioned concentration device to concentrate the liquid in the container, includes the following steps:

[0018] The liquid in the container is fed into the shell through the feeding mechanism, and the liquid in the shell is fed into the container through the pumping mechanism, so that the liquid circulates in the shell and container during the concentration process.

[0019] When the concentration of particulate matter in the liquid extracted by the pumping mechanism, the liquid input by the feeding mechanism, or the liquid in the container is less than the first set value, the overflow port is closed, the discharge pipe is opened, and the overflow concentration is switched to the filtration concentration.

[0020] When the particle size of the liquid extracted by the pumping mechanism, the liquid input by the feeding mechanism, or the liquid in the container is greater than or equal to the first set value, the discharge pipe is closed, the overflow port is opened, and the filtration concentration is switched to overflow concentration.

[0021] When the particle size of the liquid extracted by the pumping mechanism, the liquid fed by the feeding mechanism, or the liquid in the container is greater than or equal to the second set value, the concentrated liquid in the shell is discharged into the container through the feeding mechanism and / or the pumping mechanism, and the concentration is completed.

[0022] As a further improvement to the above concentration method:

[0023] The initial particulate matter concentration of the feed solution is 50–100 g / L; the first set value is 300–600 g / L; the second set value is 800–1200 g / L.

[0024] The feed rate of the feed mechanism during overflow concentration is 20-80% of the feed rate of the feed mechanism during filtration concentration;

[0025] During overflow concentration, the injection volume of the stirring mechanism is 20-80% of that during filtration concentration.

[0026] During overflow concentration, the material extraction rate of the extraction mechanism is 20-80% of that during filtration concentration.

[0027] During filtration and concentration, the feed rate is 8 to 16 times the effluent rate, the extraction rate is 12 to 24 times the effluent rate, and the feed rate is 8 to 16 times the effluent rate.

[0028] The concentrated liquid is a dispersion of positive electrode material.

[0029] In the first concentration device and method of the present invention, there are two concentration modes: a filtration concentration mode and an overflow concentration mode. When the particulate matter concentration is low, the filtration concentration mode is used, i.e., a filtration mechanism is employed for concentration. At this time, the concentration speed is fast, and the throughput of the concentrated liquid is high. As the particulate matter concentration in the liquid inside the shell increases, the filtration flux gradually decreases. However, simultaneously, the particle size increases, and its settling velocity increases. The natural settling of the particles clarifies the supernatant and meets the discharge requirements. Therefore, when the particulate matter concentration is high, the filtration mechanism is closed, and the overflow port is opened to discharge the supernatant, causing the particulate matter concentration in the bottom liquid to increase, i.e., entering the overflow concentration mode. Thus, the first concentration device and method of the present invention have a simple structure and are easy to use. By cleverly combining filtration and overflow, the concentration process operates stably, significantly improving the concentration efficiency. It effectively solves the technical problem of low concentration efficiency caused by simple filter cartridge filtration in the prior art, and has strong practicality.

[0030] The second objective of this invention is to provide a concentration apparatus and a concentration method to solve the technical problem in the prior art where stirring of the removed filter cake by a mixer causes particle breakage.

[0031] The concentration device includes a housing and also includes:

[0032] A filtration mechanism is used to filter the liquid inside the housing; the filtration mechanism has a filter element disposed inside the housing and an outlet pipe for discharging the filtrate filtered by the filter element out of the housing;

[0033] A material extraction mechanism is used to extract the concentrated liquid from the shell; the material extraction mechanism has an extraction port provided on the shell;

[0034] A stirring mechanism is used to stir the liquid inside the shell; the stirring mechanism has a nozzle located inside the shell and spraying the liquid into the shell;

[0035] A feeding mechanism is used to deliver the liquid to be concentrated into the shell; the feeding mechanism has a feeding port provided on the shell;

[0036] The filtration mechanism, material extraction mechanism, stirring mechanism, and feeding mechanism are arranged at intervals from top to bottom inside the housing.

[0037] As a further improvement to the above-mentioned concentration device: the cross-section of the end cap at the lower end of the shell decreases from top to bottom, the extraction port is located above the end cap, the spray pipe is located inside the end cap, and the feed inlet is located at the bottom of the end cap.

[0038] As a further improvement to the above-mentioned concentration device, the material extraction mechanism further includes a material extraction pipe connected to the material extraction port, the inlet of which faces the bottom of the end cap.

[0039] As a further improvement to the above-mentioned concentration device: the material extraction mechanism also includes an anti-clogging cover at the inlet of the material extraction pipe; the spray pipe is connected to the material extraction pipe; the stirring mechanism includes two sets of spray pipes symmetrically arranged along the axial direction of the shell, the two sets of spray pipes are inclined downward and the outlets are arranged opposite each other.

[0040] As a further improvement to the above-mentioned concentration device, it also includes a backflushing mechanism for blowing off the filter cake adhering to the surface of the filter element. The backflushing mechanism includes a backflushing medium conveying pipe, and the backflushing medium conveying pipe and the discharge pipe are connected to the main pipeline at the upper or lower end of the filter element respectively through valves.

[0041] As a further improvement to the above-mentioned concentration device, it also includes a pressure regulating mechanism for adjusting the pressure inside the housing, the pressure regulating mechanism including a vent and a pressure gauge disposed on the housing.

[0042] As a further improvement to the above-mentioned concentration device, a rinsing mechanism is also included, which is used to rinse the inside of the housing, and the rinsing mechanism includes a spray assembly located on the top of the housing.

[0043] As a further improvement to the above-mentioned concentration device, it also includes an overflow mechanism for discharging the supernatant from the liquid in the housing; the overflow mechanism is located above the filtration mechanism; the overflow mechanism has an overflow port on the housing.

[0044] As a further improvement to the above-mentioned concentration device, the overflow mechanism further includes an overflow groove arranged circumferentially along the inner wall of the housing, the overflow groove having an overflow notch, and the overflow groove communicating with the overflow port.

[0045] As a further improvement to the above-mentioned concentration device, a control mechanism is also included, which is used to control the start and stop of the filtration mechanism and the overflow mechanism. The control mechanism includes a level gauge and a concentration detector for detecting the particulate matter concentration of the feed liquid, both located within the housing.

[0046] The concentration method employs the concentration apparatus described above.

[0047] In the second concentration device and method of the present invention, instead of using a mixer to stir the liquid, stirring is achieved by spraying the liquid. This effectively prevents the liquid from settling to the bottom and also prevents particle breakage. Especially when the sprayed liquid is drawn by a pumping mechanism, it does not disturb the stability of the liquid inside the housing and allows for secondary concentration. The second concentration device and method of the present invention have a simple structure and are easy to use. By using a liquid jet stirring method, it effectively solves the technical problem in the prior art where stirring the removed filter cake with a mixer causes particle breakage, making it highly practical.

[0048] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0049] The accompanying drawings, which form part of this invention, are used to aid in understanding the invention. The content provided in the drawings and their related descriptions can be used to explain the invention, but do not constitute an undue limitation of the invention. In the drawings:

[0050] Figure 1 This is a schematic diagram of the concentration device according to Embodiment 1 of the present invention.

[0051] Figure 2 This is a schematic diagram of the concentration device in Embodiment 2 of the present invention.

[0052] Figure 3 This is a diagram showing the usage state of the concentration device in Embodiment 1 of the present invention.

[0053] The relevant markings in the above figures are:

[0054] 001-Shell, 002-End cap, 003-Container, 110-Overflow port, 120-Overflow trough, 130-Overflow notch, 140-Supernatant delivery pipe, 150-Third regulating valve, 210-Filter element, 220-Discharge pipe, 230-Main pipe, 240-First regulating valve, 310-Suction port, 320-Suction pipe, 330-Anti-clogging cover, 340-Liquid delivery pipe, 350-Circulation pump, 360-Secondary regulating valve Two regulating valves, 410-spray nozzle, 420-return pipeline, 510-feed inlet, 520-feed pipe, 530-feed pump, 540-drain valve, 610-backflush medium conveying pipeline, 710-vent, 720-pressure gauge, 730-throttle valve, 740-air inlet pipeline, 750-exhaust pipeline, 760-automatic valve, 810-spray assembly, 820-spray head, 910-level gauge, 920-concentration detector. Detailed Implementation

[0055] The present invention will now be clearly and completely described in conjunction with the accompanying drawings. Those skilled in the art will be able to implement the present invention based on these descriptions. Before describing the present invention in conjunction with the accompanying drawings, it should be particularly noted that:

[0056] The technical solutions and features provided in the various parts of this invention, including the following description, can be combined with each other without conflict.

[0057] Furthermore, the embodiments of the present invention described below are generally only some, not all, of the embodiments of the present invention. Therefore, all other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort should fall within the scope of protection of the present invention.

[0058] Regarding the terminology and units used in this invention: The terms "comprising," "having," and any variations thereof in the specification, claims, and related parts of this invention are intended to cover non-exclusive inclusion.

[0059] Example 1

[0060] Figure 1 This is a schematic diagram of the concentration device in this embodiment.

[0061] like Figure 1-2 As shown, the concentration device includes a shell 001, a filtration mechanism, a material extraction mechanism, a stirring mechanism, a feeding mechanism, a backflushing mechanism, a pressure regulating mechanism, and a rinsing mechanism. The filtration mechanism, material extraction mechanism, stirring mechanism, and feeding mechanism are arranged at intervals from top to bottom within the shell 001, and the pressure regulating mechanism and rinsing mechanism are located at the top of the shell 001.

[0062] The cross-section of the end cap 002 at the lower end of the housing 001 decreases from top to bottom, and the end cap 002 is conical, ellipsoidal or butterfly-shaped.

[0063] The filtration mechanism is used to filter and concentrate the liquid inside the housing 001. The filtration mechanism has a filter element 210 disposed inside the housing 001 and an outlet pipe 220 for discharging the filtrate filtered by the filter element 210 out of the housing 001. The filtration mechanism preferably includes at least two filter elements 210, each filter element 210 including at least two tubular filter tubes, which facilitates maintaining the stability of filtration. The volume between the filtration mechanism and the top of the housing 001 and the volume between the filtration mechanism and the bottom of the housing 001 are preferably 20-40% of the total volume of the housing 001, which facilitates the installation and operation of other processing mechanisms. A first regulating valve 240 is provided on the outlet pipe 220 to regulate the outlet flow rate. The first regulating valve 240 may be, but is not limited to, an electric regulating valve or a pneumatic regulating valve.

[0064] The material extraction mechanism is used to extract the concentrated liquid inside the housing 001. The material extraction mechanism has an extraction port 310 on the housing 001 and an extraction pipe 320 connected to the extraction port 310. The extraction port 310 is located above the end cap 002. The extraction pipe 320 extends into the housing 001 and the liquid inlet faces the bottom of the end cap 002. An anti-clogging cover 330 is provided at the inlet of the extraction pipe 320 to prevent the filter cake from clogging the extraction pipe 320. A circulation pump 350 is provided on the extraction pipe 320. The circulation pump 350 can be, but is not limited to, any one of a diaphragm pump, centrifugal pump, hose pump, and rotor pump.

[0065] The stirring mechanism is used to stir the liquid inside the shell 001; the stirring mechanism has a nozzle 410 disposed inside the shell 001 and spraying the liquid into the shell 001; the nozzle 410 is disposed inside the end cap 002; preferably, the stirring mechanism includes two sets of nozzles 410 symmetrically arranged along the axial direction of the shell 001, each set of nozzles 410 having one or more nozzles 410, the two sets of nozzles 410 being inclined downwards and having their outlets facing each other, the included angle between the two sets of nozzles 410 being 20 to 60°.

[0066] The nozzle 410 is connected to the extraction pipe 320, that is, the outlet of the extraction pipe 320 is divided into two paths, one is the return pipe 420, and the other is the liquid conveying pipe 340; the return pipe 420 or the liquid conveying pipe 340 is provided with a second regulating valve 360 ​​to regulate the spray volume (also known as the return flow) of the nozzle 410. The second regulating valve 360 ​​may be, but is not limited to, an electric regulating valve or a pneumatic regulating valve.

[0067] The feeding mechanism is used to convey the concentrated liquid into the housing 001; the feeding mechanism has a feed inlet 510 and a feed pipe 520 on the housing 001, the feed inlet 510 is located at the bottom of the end cap 002, and the feed pipe 520 is equipped with a feed pump 530, which can be, but is not limited to, any one of a diaphragm pump, centrifugal pump, hose pump, and rotor pump.

[0068] The backflushing mechanism is used to blow off the filter cake adhering to the surface of the filter element 210. The backflushing mechanism includes a backflushing medium conveying pipe 610, and the backflushing medium conveying pipe 610 and the discharge pipe 220 are connected to the main pipe 230 at the upper or lower end of the filter element 210 respectively through valves. The backflushing medium can be backflushing air, regeneration liquid, or both can be used alternately.

[0069] The pressure regulating mechanism is used to regulate the pressure inside the housing 001. The pressure regulating mechanism includes a vent 710 and a pressure gauge 720 provided on the housing 001. The vent 710 is provided with a throttle valve 730. The throttle valve 730 is connected to the inlet pipe 740 and the exhaust pipe 750 of the protective gas via a three-way valve. Automatic valves 760 are provided on both the inlet pipe 740 and the exhaust pipe 750. The automatic valves 760 can be, but are not limited to, any one of a pneumatic ball valve, a pneumatic butterfly valve, or a solenoid valve. The protective gas can be, but is not limited to, any one of nitrogen, argon, carbon dioxide, ammonia, or water vapor.

[0070] The rinsing mechanism is used to rinse the inside of the housing 001. The rinsing mechanism includes a spray assembly 810 located on the top of the housing 001. The spray assembly 810 includes a nozzle 820. The nozzle 820 can be, but is not limited to, any one of a spray ball, a spiral nozzle, or a universal nozzle. The cleaning water used by the rinsing mechanism and the regeneration liquid used by the backflushing mechanism can both be the filtrate discharged from the rinsing pipe 220 or the supernatant discharged from the supernatant conveying pipe 140.

[0071] from Figure 1-2 It can be seen that after switching to overflow concentration, the particulate matter in the liquid settles and accumulates below the shell 001 under the action of gravity. Under the stirring action of the stirring mechanism, the accumulated liquid maintains a fluid state and does not sink to the bottom. The supernatant flows out from the overflow port 110, so that the liquid at the extraction port 310 and the inlet port 510 always maintains a concentration difference until the concentration of particulate matter reaches the concentration requirement.

[0072] Example 2

[0073] Figure 2 This is a schematic diagram of the concentration device in this embodiment. Figure 3 This is a diagram showing the usage state of the concentration device in this embodiment.

[0074] Based on Example 1, the concentration device in this embodiment further has the following configuration: Figure 2-3 As shown, the concentration device also includes an overflow mechanism and a control mechanism. The overflow mechanism is used to discharge the supernatant in the liquid inside the housing 001. The overflow mechanism is located above the filtration mechanism, and the control mechanism is used to control the start and stop of the filtration mechanism and the overflow mechanism.

[0075] The overflow mechanism has an overflow groove 120 arranged circumferentially along the inner wall of the housing 001, an overflow port 110 provided on the housing 001, and a supernatant conveying pipe 140 connected to the overflow port 110. The overflow groove 120 is provided with an overflow notch 130, and the overflow groove 120 communicates with the overflow port 110. Preferably, there are two overflow ports 110, which are symmetrically arranged on the housing 001. A third regulating valve 150 is installed on the supernatant conveying pipe 140. The third regulating valve 150 may be, but is not limited to, an electric regulating valve or a pneumatic regulating valve.

[0076] The control mechanism includes a level gauge 910 installed in the housing 001 and a concentration detector 920 for detecting the particulate matter concentration of the liquid. The concentration detector 920 can be installed in the extraction pipe 320, the liquid delivery pipe 340 or the return pipe 420, on the feed pipe 520, or directly in the container 003 containing the liquid.

[0077] An embodiment of the concentration method of the present invention involves using the concentration apparatus described in Example 2 to concentrate the liquid in container 003, including the following steps:

[0078] The liquid in container 003 is fed into shell 001 by the feeding mechanism, and the liquid in shell 001 is fed into container 003 by the pumping mechanism, so that the liquid circulates in shell 001 and container 003 during the concentration process.

[0079] When the concentration of particulate matter in the liquid extracted by the feeding mechanism, the liquid input by the feeding mechanism, or the liquid in container 003 is less than the first set value, the overflow port 110 is closed, the discharge pipe 220 is opened, and the overflow concentration is switched to the filtration concentration.

[0080] When the particle size of the liquid extracted by the extraction mechanism or the liquid in the liquid container 003 input by the feeding mechanism is greater than or equal to the first set value, the discharge pipe 220 is closed and the overflow port 110 is opened, switching the filtration concentration to overflow concentration.

[0081] When the particle size of the liquid extracted by the extraction mechanism and the liquid fed into container 003 by the feeding mechanism is greater than or equal to the second set value, the concentrated liquid in shell 001 is discharged into container 003 through feeding mechanism and / or extraction mechanism, and the concentration is completed.

[0082] To improve filtration and concentration efficiency and ensure the quality of the supernatant from overflow concentration, when the initial particulate matter concentration of the feed liquid is 50–100 g / L, the first set value is preferably 300–600 g / L, and the second set value is 800–1200 g / L. During overflow concentration, the feed rate of the feeding mechanism is 20–80% of that during filtration concentration; the spray rate of the stirring mechanism is 20–80% of that during filtration concentration; the extraction rate of the extraction mechanism is 20–80% of that during filtration concentration; the feed rate during filtration concentration is 8–16 times the effluent volume; the extraction rate is 12–24 times the effluent volume; and the feed rate is 8–16 times the effluent volume. It is evident that during overflow concentration, the feed rate, spray rate, and extraction rate are all reduced to a certain extent compared to filtration concentration, which helps ensure that the clarity of the supernatant produced by overflow concentration meets the standards.

[0083] The concentration apparatus and method of the present invention can concentrate common solid-liquid mixtures, and are particularly suitable for use in the production process of some cathode materials such as cobalt carbonate. When the liquid to be concentrated is a cathode material dispersion in a reactor (or intermediate reactor), the liquid conveying pipeline 340 and the feed pipe 520 can be directly connected to the reactor (i.e., container 003 is the reactor) to concentrate the cathode material dispersion. The concentration is stable and efficient, and the particles are not easily broken.

[0084] In the production process of positive electrode material crystallization reaction, the concentration device and the reactor are connected in series. The reaction process in the reactor is actually the continued growth of crystals on the surface of the original solid particles. The function of the concentration device is to separate the waste liquid (filtrate and supernatant) generated after the crystallization reaction so as to concentrate the particulate matter in the liquid and return the concentrated liquid to the reactor. In this way, the addition of crystallization reaction raw materials to the reactor, the addition of concentrated liquid to the reactor, and the crystallization reaction can all take place at the same time.

[0085] When the reactor is first started, the initial particulate matter concentration in the liquid is usually only 50-100 g / L. However, as the raw materials are continuously added, the waste liquid is continuously discharged, and the crystallization reaction continues, the liquid level in the reactor and the concentration device remains unchanged, so the particulate matter concentration in the liquid will continue to rise.

[0086] The endpoint of the crystallization reaction is preferably determined by the particulate matter concentration inside the reactor. Once the particulate matter concentration in the reactor reaches the second design value, the crystallization reaction and concentration process can be stopped. At this point, the feed particulate matter concentration is equal to the particulate matter concentration inside the reactor, while the extracted particulate matter concentration is slightly higher than the feed particulate matter concentration. Therefore, when the concentration unit and reactor are used in conjunction, the feed particulate matter concentration of the concentration unit changes dynamically, and ultimately, the feed particulate matter concentration of the concentration unit is essentially equal to the particulate matter concentration at the concentration endpoint.

[0087] When the overflow concentration causes the particulate matter concentration in the reactor to reach the second set value, the stirring mechanism continues to run. At the same time, the throttle valve 730 and the automatic valve 760 on the air inlet pipe 740 are opened to pressurize the protective gas into the shell 001. Under the pressure of the protective gas, the liquid in the shell 001 is forced back into the reactor from the extraction port 310 and the inlet port 510. Finally, the small amount of liquid remaining at the bottom of the end cap 002 is discharged into the reactor or waste tank through the drain valve 540 on the feed pipe 520.

[0088] The foregoing has described the relevant content of the present invention. Those skilled in the art will be able to implement the present invention based on these descriptions. All other embodiments obtained by those skilled in the art based on the above description of the present invention without inventive effort should fall within the scope of protection of the present invention.

Claims

1. Concentration method, characterized in that: The concentration device is used for concentrating the liquid in the container (003), and comprises a shell (001), and further comprises: An overflow mechanism for discharging supernatant in the liquid in the shell (001); the overflow mechanism is provided with an overflow port (110) on the shell (001); A filtering mechanism for filtering and concentrating the liquid in the shell (001); the filtering mechanism is provided with a filter core (210) in the shell (001) and a clear liquid outlet pipeline (220) for discharging the filtered clear liquid after the filter core (210) in the shell (001); A material extraction mechanism for extracting the concentrated liquid in the shell (001); the material extraction mechanism is provided with a material extraction port (310) on the shell (001); A feeding mechanism for feeding the liquid to be concentrated into the shell (001); the feeding mechanism is provided with a feeding port (510) on the shell (001); The overflow mechanism, the filtering mechanism, the material extraction mechanism and the feeding mechanism are arranged in the shell (001) in a top-to-bottom manner; The concentration method comprises the following steps: The liquid in the container (003) is input into the shell (001) through the feeding mechanism, and the liquid in the shell (001) is input into the container (003) through the material extraction mechanism, so that the liquid circulates in the shell (001) and the container (003) during the concentration process; When the concentration of particles in the liquid extracted by the material extraction mechanism, the liquid input by the feeding mechanism or the liquid in the container (003) is less than a first set value, the overflow port (110) is closed, the clear liquid outlet pipeline (220) is opened, and the overflow concentration is switched to the filtering concentration; When the particle size of the liquid extracted by the material extraction mechanism, the liquid input by the feeding mechanism or the liquid in the container (003) is greater than or equal to the first set value, the clear liquid outlet pipeline (220) is closed, the overflow port (110) is opened, and the filtering concentration is switched to the overflow concentration; When the particle size of the liquid extracted by the material extraction mechanism, the liquid input by the feeding mechanism or the liquid in the container (003) is greater than or equal to the second set value, the concentrated liquid in the shell (001) is discharged into the container (003) through the material extraction mechanism, and the concentration is completed.

2. The concentration method according to claim 1, wherein: The cross section of the head (002) at the lower end of the shell (001) decreases from top to bottom, the material extraction port (310) is arranged above the head (002), and the feeding port (510) is arranged at the bottom of the head (002); Further comprising a stirring mechanism, the stirring mechanism comprises a spray pipe (410) arranged in the head (002) and spraying the liquid into the head (002); The material extraction mechanism further comprises a material extraction pipe (320) connected with the material extraction port (310), and the inlet of the material extraction pipe (320) faces the bottom of the head (002).

3. The concentration method of claim 2, wherein: The material extraction mechanism further comprises an anti-blocking cover (330) arranged at the inlet of the material extraction pipe (320); the spray pipe (410) communicates with the material extraction pipe (320); and the stirring mechanism comprises two groups of spray pipes (410) arranged in an axial symmetry along the shell (001), and the two groups of spray pipes (410) are arranged oppositely with the discharge ports inclined downward.

4. The concentration method of claim 1, wherein: The overflow mechanism comprises an overflow groove (120) arranged along the inner wall of the shell (001), wherein the overflow groove (120) is provided with an overflow gap (130), and the overflow groove (120) is communicated with the overflow port (110).

5. The concentration method of claim 1, wherein: The back flushing mechanism is further included for blowing off the filter cake adhered to the surface of the filter core (210), and the back flushing mechanism comprises a back flushing medium conveying pipeline (610) connected with the main pipeline (230) at the upper end or the lower end of the filter core (210) through a valve and the clear liquid pipeline (220).

6. The concentration method of claim 1, wherein: The pressure regulating mechanism is further included for regulating the pressure in the shell (001), and the pressure regulating mechanism comprises a vent (710) and a pressure gauge (720) arranged on the shell (001).

7. The concentration method of claim 1, wherein: The flushing mechanism is further included for flushing the inside of the shell (001), and the flushing mechanism comprises a spraying assembly (810) arranged on the top of the shell (001).

8. The concentration method of claim 1, wherein: The control mechanism is further included for controlling the start and stop of the filtering mechanism and the overflow mechanism, and the control mechanism comprises a liquid level gauge (910) and a concentration detector (920) arranged in the shell (001) for detecting the particle concentration of the feed liquid.

9. The concentration method according to claim 1, wherein: the initial particle concentration of the feed liquid is 50-100 g / L, the first set value is 300-600 g / L, and the second set value is 800-1200 g / L; the feeding amount of the feeding mechanism during overflow concentration is 20-80% of the feeding amount of the feeding mechanism during filtration concentration; the spraying amount of the stirring mechanism during overflow concentration is 20-80% of the spraying amount of the stirring mechanism during filtration concentration; the pumping amount of the pumping mechanism during overflow concentration is 20-80% of the pumping amount of the pumping mechanism during filtration concentration; the feeding amount during filtration concentration is 8-16 times of the clear liquid amount, the pumping amount is 12-24 times of the clear liquid amount, and the feeding amount is 8-16 times of the clear liquid amount; the feed liquid to be concentrated is a positive electrode material dispersion liquid.

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