Cobalt hydroxide washing device

Abstract

The utility model discloses a cobalt hydroxide washing device which comprises a pressure filter tank, a pressing mechanism and a discharging mechanism, and a first filter screen, a partition plate and a second filter screen are sequentially and detachably connected in the pressure filter tank from one side to the other side at intervals. The pressure filter tank is internally divided into a first pressure filter sub-tank, a first filter tank, a second pressure filter sub-tank and a second filter tank in sequence from one side to the other side, and a first feed valve, a first drain valve and a second drain valve which are correspondingly communicated with the first pressure filter sub-tank, the first filter tank and the second filter tank are arranged outside the pressure filter tank; the first filter pressing sub-pool and the second filter pressing sub-pool are correspondingly provided with a material pressing mechanism for pressing materials and a material unloading mechanism for unloading the materials, and the aperture of the first filter screen is larger than that of the second filter screen. According to the cobalt hydroxide washing device, the cobalt hydroxide material does not need to be subjected to filter pressing and pulping for many times, the water consumption is low, the loss amount of the cobalt hydroxide material is small, and the washing effect is good.

Description

Technical Field

[0001] The utility model relates to the technical field of cobalt hydroxide washing, in particular to a cobalt hydroxide washing device. Background Art

[0002] Nano-sized cobalt hydroxide can play an important role as a lithium battery precursor, catalyst, etc. At present, the synthesis process of cobalt hydroxide mostly adopts the liquid phase precipitation method, but the cobalt hydroxide slurry with small particle size has high viscosity and poor water permeability. The washing effect of direct flushing in the filter press is poor, and a large amount of soluble impurities will remain.

[0003] The selection of multiple filter pressing and pulping in the conventional process means that a large amount of water is required for flushing during the washing process, and material leakage is serious. Utility Model Content

[0004] The utility model aims to provide a cobalt hydroxide washing device to save water resources and reduce material loss.

[0005] In order to solve the above technical problems, the utility model provides the following technical solutions:

[0006] A cobalt hydroxide washing device comprises a filter press tank, a material pressing mechanism and a discharge mechanism, wherein a first filter screen, a partition plate and a second filter screen are detachably connected in sequence from one side to the other side of the filter press tank, so as to separate the filter press tank from one side to the other side in sequence into a first filter press sub-tank, a first filter tank, a second filter press sub-tank and a second filter tank, a first feed valve, a first drain valve and a second drain valve corresponding to the first filter press sub-tank, the first filter tank and the second filter tank are arranged outside the filter press tank, the first filter press sub-tank and the second filter press sub-tank are both correspondingly provided with the material pressing mechanism for squeezing materials and the discharge mechanism for discharging materials, and the aperture of the first filter screen is larger than the aperture of the second filter screen.

[0007] Preferably, it also includes a hydraulic station, the pressing mechanism includes a pressing plate and a pressing hydraulic cylinder, the first filter press sub-tank and the second filter press sub-tank are each provided with the pressing plate, the outer edge of the pressing plate in the first filter press sub-tank is close to the inner wall of the first filter press sub-tank, the outer edge of the pressing plate in the second filter press sub-tank is close to the inner wall of the second filter press sub-tank, the pressing hydraulic cylinder is connected to the side of the pressing plate facing away from the filter press tank, the pressing hydraulic cylinder is used to drive the pressing plate to squeeze the material, and a hydraulic pipe is connected between the pressing hydraulic cylinder and the hydraulic station.

[0008] Preferably, the unloading mechanism includes a unloading plate and a unloading hydraulic cylinder, one side of the first filter press sub-tank and the second filter press sub-tank are both provided with openings, and the unloading plate is provided at the opening, the unloading hydraulic cylinder is connected to the side of the unloading plate facing away from the filter press tank to drive the unloading plate to open and close the opening, and the hydraulic pipe is connected between the unloading hydraulic cylinder and the hydraulic station.

[0009] Preferably, the pressing plate and the discharge plate of the first filter press sub-tank are correspondingly located at the upper and lower sides of the first filter press sub-tank, and the pressing plate and the discharge plate of the second filter press sub-tank are correspondingly located at the upper and lower sides of the second filter press sub-tank.

[0010] Preferably, it further comprises a second feed valve disposed outside the filter press tank, and the second feed valve is connected to the first filter press sub-tank.

[0011] Preferably, a third filter screen is further included, the aperture of the third filter screen is smaller than or equal to the aperture of the second filter screen, and the third filter screen is used to replace the first filter screen.

[0012] Preferably, it also includes an aging kettle for receiving the materials after squeezing in the first filter press sub-tank and the second filter press sub-tank and pulping the materials. The aging kettle includes a shell, a cover and a stirring motor. A feed port is opened on one side of the shell, the cover is connected to the feed port, and the stirring motor is connected to the shell and is used to stir the material in the shell.

[0013] Preferably, a water inlet valve is connected to the outside of the shell, and the water inlet valve is communicated with the inside of the shell.

[0014] Preferably, an air intake valve is connected to the outside of the shell, and the air intake valve is communicated with the inside of the shell.

[0015] Preferably, a discharge valve is connected to the outer side of the bottom of the shell, and the discharge valve is communicated with the inside of the shell.

[0016] Compared with the prior art, the cobalt hydroxide washing device of the utility model has the following beneficial effects:

[0017] In the utility model, when the initial cobalt hydroxide material is filtered, the partition is first opened to allow the first filter press sub-tank to communicate with the second filter press sub-tank, and the cobalt hydroxide material enters the first filter press sub-tank from the first feed valve. At the same time, a small amount of organic foaming agent is added to the first filter press sub-tank to reduce the viscosity of the cobalt hydroxide material, so as to greatly reduce the water content of the cobalt hydroxide material during the filter press. The weight ratio of the foaming agent to the cobalt hydroxide material is 1:5000-10000. Then, in the first step of filter press, the pressing mechanism of the first filter press sub-tank presses the cobalt hydroxide material therein. Due to the first filter screen and the second filter screen, the cobalt hydroxide material is pressed by the pressing mechanism of the first filter press sub-tank. The first filter screen is set, and the aperture of the first filter screen is larger than the aperture of the second filter screen. Most of the cobalt hydroxide material is retained in the first filter press sub-tank, and most of the soluble sodium salt and part of the cobalt hydroxide material pass through the first filter screen along with the water flow into the second filter press sub-tank, and then the partition is installed, and then further squeezed by the pressing mechanism on the second filter press sub-tank, and the second drain valve is opened at the same time, the second filter screen can intercept the cobalt hydroxide material in the second filter press sub-tank, and the soluble sodium salt soluble in water is discharged from the second drain valve. After the filter press tank is finished, the unloading mechanism is opened to discharge the cobalt hydroxide material in the first filter press sub-tank and the second filter press sub-tank. The material is taken out and water is added for pulping, so that the cobalt hydroxide material filtered in the first step is made into a slurry. After that, the cobalt hydroxide material after pulping is passed through the first feed valve into the first filter press sub-tank again. At this time, the partition is still installed in the filter press tank. Then, the pressing mechanism on the first filter press sub-tank performs filter pressing on the cobalt hydroxide material in the first filter press sub-tank, and the first drain valve is opened for drainage. After the filter pressing is completed, the cobalt hydroxide material filtered again is taken out through the unloading mechanism to complete the washing of the cobalt hydroxide material. In the cobalt hydroxide washing device, during the first filter pressing operation, the first filter press sub-tank uses a foaming agent to reduce the initial cobalt hydroxide material. The surface activity and viscosity can make the filtration in the first filter press sub-tank can greatly reduce the moisture content of the cobalt hydroxide material and the content of soluble sodium salt. The second filter press sub-tank effectively intercepts the cobalt hydroxide material and discharges most of the mother liquor to avoid material loss. Then, the pressed cobalt hydroxide material is pulped to greatly reduce the viscosity of the cobalt hydroxide material. Finally, when the second step of filtration is performed, the soluble sodium salt dissolved in the pulping washing water is filtered out by the filter press. Therefore, the cobalt hydroxide washing device of the present application does not need to perform filtration and pulping on the cobalt hydroxide material multiple times, the water consumption is small, the loss of cobalt hydroxide material is small, and the washing effect is better. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of an embodiment of the utility model;

[0019] Figure 2 It is a structural schematic diagram of an aging kettle according to an embodiment of the utility model.

[0020] In the figure, 1, filter press tank; 11, first filter screen; 12, partition; 13, second filter screen; 14, first filter press sub-tank; 141, first feed valve; 142, second feed valve; 15, first filter tank; 151, first drain valve; 16, second filter press sub-tank; 17, second filter tank; 171, second drain valve; 2, pressing mechanism; 21, pressing plate; 22, pressing hydraulic cylinder; 3, unloading mechanism; 31, unloading plate; 32, unloading hydraulic cylinder; 4, aging kettle; 41, shell; 42, cover; 43, stirring motor; 44, water inlet valve; 45, air inlet valve; 46, discharge valve; 5, hydraulic station; 6, hydraulic pipe. DETAILED DESCRIPTION

[0021] The following is a further detailed description of the specific implementation of the present invention in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0022] In the description of the present utility model, it should be understood that the wording "comprising" used in the present utility model specification refers to the presence of the features, integers, steps, operations, parts / components and / or assemblies, but does not exclude the presence or addition of one or more other features, integers, steps, operations, parts / components, assemblies and / or their groups. It should be understood that when we say that a part / component is "connected" to another part / component, it can be directly connected to the other part / component, or there can be intermediate parts / components. The wording "and / or" used here includes all or any unit and all combinations of one or more associated listed items.

[0023] like Figure 1 and Figure 2 As shown, the utility model relates to a cobalt hydroxide washing device, comprising a filter press 1, a material pressing mechanism 2 and a discharge mechanism 3, wherein the filter press 1 is sequentially and detachably connected with a first filter screen 11, a partition 12 and a second filter screen 13 from one side to the other side, so as to sequentially separate the filter press 1 from one side to the other side into a first filter press sub-tank 14, a first filter tank 15, a second filter press sub-tank 16 and a second filter tank 17, and the filter press 1 is provided with a first feed valve 141, a first drain valve 151 and a second drain valve 171 corresponding to the first filter press sub-tank 14, the first filter tank 15 and the second filter tank 17, the first filter press sub-tank 14 and the second filter press sub-tank 16 are both correspondingly provided with the material pressing mechanism 2 for squeezing the cobalt hydroxide material and the discharge mechanism 3 for discharging the cobalt hydroxide material, and the aperture of the first filter screen 11 is larger than the aperture of the second filter screen 13.

[0024] In the present invention, when the initial cobalt hydroxide material is filtered, the partition 12 is first opened to allow the first filter press sub-tank 14 to communicate with the second filter press sub-tank 16, and the cobalt hydroxide material enters the first filter press sub-tank 14 from the first feed valve 141. At the same time, a small amount of organic foaming agent is added to the first filter press sub-tank 14 to reduce the viscosity of the cobalt hydroxide material, so as to greatly reduce the water content of the cobalt hydroxide material during the filter press. The weight ratio of the foaming agent to the cobalt hydroxide material is 1:5000-10000. Then, in the first step of filter press, the pressing mechanism 2 of the first filter press sub-tank 14 presses the cobalt hydroxide material therein. Due to the first filter screen 11 and the second filter screen 1 3 is set, and the aperture of the first filter screen 11 is larger than the aperture of the second filter screen 13, most of the cobalt hydroxide material is retained in the first filter press tank 14, most of the soluble sodium salt and part of the cobalt hydroxide material pass through the first filter screen 11 with the water flow into the second filter press tank 16, and then the partition 12 is installed, and then further squeezed by the pressing mechanism 2 on the second filter press tank 16, and the second drain valve 171 is opened at the same time, the second filter screen 13 can intercept the cobalt hydroxide material in the second filter press tank 16, and the soluble sodium salt soluble in water is discharged from the second drain valve 171. After the filtration of the filter press tank 1 is completed, the unloading mechanism 3 is opened to drain the first filter press tank 14 and The cobalt hydroxide material in the second filter press sub-tank 16 is taken out and water is added for slurrying, so that the cobalt hydroxide material filtered in the first step is made into slurry. After that, the slurryed cobalt hydroxide material is again passed through the first feed valve 141 into the first filter press sub-tank 14. At this time, the partition plate 12 is still installed in the filter press tank 1. Then, the pressing mechanism 2 on the first filter press sub-tank 14 performs filter pressing on the cobalt hydroxide material in the first filter press sub-tank 14, and the first drain valve 151 is opened for drainage. After the filter pressing is completed, the cobalt hydroxide material filtered again is taken out through the unloading mechanism 3 to complete the washing of the cobalt hydroxide material. In the cobalt hydroxide washing device, during the first filter pressing operation, the first filter press sub-tank 14 The use of a foaming agent to reduce the surface activity and viscosity of the initial cobalt hydroxide material can enable the first filter press sub-tank 14 to significantly reduce the moisture content of the cobalt hydroxide material and the content of soluble sodium salt. The second filter press sub-tank 16 effectively intercepts the cobalt hydroxide material and discharges most of the mother liquor to avoid material loss. The pressed cobalt hydroxide material is then pulped to significantly reduce the viscosity of the cobalt hydroxide material. Finally, when the second filter press is performed, the filter press filters out the soluble sodium salt dissolved in the pulping wash water. Therefore, the cobalt hydroxide washing device of the present application does not need to perform filter pressing and pulping on the cobalt hydroxide material multiple times, consumes less water, has less loss of cobalt hydroxide material, and has a better washing effect.

[0025] It should be noted that the organic foaming agent is sodium lauryl sulfate.

[0026] It should be noted that, due to the setting of the first filter screen 11, most of the cobalt hydroxide material remains in the first filter press sub-tank 14, and only a small amount of cobalt hydroxide material passes through the first filter screen 11. Furthermore, the distance between the partition 12 and the first filter screen 11 is small, that is, the space of the first filter tank 15 is narrow, and only the width for the installation of the first drain valve 151 needs to be maintained. Therefore, when the cobalt hydroxide material is filtered in the first filter press sub-tank 14, there will not be too much cobalt hydroxide material remaining in the first filter tank 15, and the water flow generated when the first filter press sub-tank 14 is squeezed can flush the cobalt hydroxide material remaining in the first filter tank 15 into the second filter press sub-tank 16, thereby further reducing the loss of cobalt hydroxide material.

[0027] In this embodiment, three slide groups are sequentially arranged on two opposite sides of the filter press 1 from one end to the other end, and the slide group includes two vertically arranged slides, and the two slides are correspondingly located on two opposite sides of the filter press 1, and the first filter screen 11, the partition 12 and the second filter screen 13 are detachably connected in the three slide groups one by one.

[0028] Specifically, the first filter screen 11, the partition 12 and the second filter screen 13 slide downward from the top of the filter press tank 1 into the slideway to achieve a detachable connection between the first filter screen 11, the partition 12 and the second filter screen 13 and the filter press tank 1. Furthermore, the first filter screen 11, the partition 12 and the second filter screen 13 can be installed manually or automatically. For example, a linear drive component such as a cylinder can be provided to drive the first filter screen 11, the partition 12 and the second filter screen 13 to slide into or out of the filter press tank 1.

[0029] In this embodiment, the cobalt hydroxide washing device also includes a hydraulic station 5, the pressing mechanism 2 includes a pressing plate 21 and a pressing hydraulic cylinder 22, the first filter press sub-tank 14 and the second filter press sub-tank 16 are each provided with the pressing plate 21, the outer edge of the pressing plate 21 in the first filter press sub-tank 14 is close to the inner wall of the first filter press sub-tank 14, the outer edge of the pressing plate 21 in the second filter press sub-tank 16 is close to the inner wall of the second filter press sub-tank 16, the pressing hydraulic cylinder 22 is connected to the side of the pressing plate 21 facing away from the filter press tank 1, the pressing hydraulic cylinder 22 is used to drive the pressing plate 21 to squeeze the cobalt hydroxide material, and a hydraulic pipe 6 is connected between the pressing hydraulic cylinder 22 and the hydraulic station 5.

[0030] The hydraulic station 5 is connected to the material pressing hydraulic cylinder 22 via the hydraulic pipe 6 , so as to drive the material pressing plate 21 to move, so as to realize the pressing of the cobalt hydroxide materials in the first filter press sub-tank 14 and the second filter press sub-tank 16 .

[0031] In this embodiment, the unloading mechanism 3 includes a unloading plate 31 and a unloading hydraulic cylinder 32. Openings are provided on one side of the first filter press sub-tank 14 and the second filter press sub-tank 16, and the unloading plate 31 is provided at the opening. The unloading hydraulic cylinder 32 is connected to the side of the unloading plate 31 facing away from the filter press tank 1 to drive the unloading plate 31 to open and block the opening. The hydraulic pipe 6 is connected between the unloading hydraulic cylinder 32 and the hydraulic station 5.

[0032] The openings of the first filter press sub-tank 14 and the second filter press sub-tank 16 are both provided with a discharge plate 31, and the discharge hydraulic cylinder 32 can drive the discharge plate 31 to open or block the openings of the first filter press sub-tank 14 and the second filter press sub-tank 16, so that when pressing the materials, the discharge plate 31 blocks the openings of the first filter press sub-tank 14 and the second filter press sub-tank 16, and after the pressing of the materials is completed, the discharge plate 31 opens the openings of the first filter press sub-tank 14 and the second filter press sub-tank 16 to complete the discharge work.

[0033] Specifically, one side of the discharge plate 31 can be hinged to one side of the opening, so that when the discharge hydraulic cylinder 32 is driven, the discharge plate 31 can be driven to rotate to open or block the opening. It should be noted that at this time, the telescopic rod of the discharge hydraulic cylinder 32 is hinged to the discharge plate 31; the discharge plate 31 can also block the opening horizontally, and when the discharge hydraulic cylinder 32 is driven, the discharge plate 31 can be driven to move in the vertical direction, and the discharge plate 31 is always in a horizontal state to open or block the opening. Then, when discharging, the discharge hydraulic cylinder 32 drives the discharge plate 31 to open the opening, and the cobalt hydroxide material after squeezing is gathered on the discharge plate 31, and then the cobalt hydroxide material on the discharge plate 31 can be scraped off from the discharge plate 31 manually; or, a linear drive member such as a cylinder and a scraper can also be provided, and the cobalt hydroxide material on the discharge plate 31 can be scraped off by the linear drive member such as the cylinder to improve the discharge efficiency.

[0034] Preferably, the pressing plate 21 and the discharge plate 31 of the first filter press sub-tank 14 are correspondingly located on the upper and lower sides of the first filter press sub-tank 14 , and the pressing plate 21 and the discharge plate 31 of the second filter press sub-tank 16 are correspondingly located on the upper and lower sides of the second filter press sub-tank 16 .

[0035] That is, when the first filter press sub-tank 14 and the second filter press sub-tank 16 are performing filter pressing, the pressing hydraulic cylinder 22 drives the pressing plate 21 to press the cobalt hydroxide material from top to bottom, and the pressed cobalt hydroxide material is accumulated on the discharge plate 31, so that when the discharge hydraulic cylinder 32 drives the discharge plate 31 to open, the pressed cobalt hydroxide material can be easily taken out.

[0036] In this embodiment, the cobalt hydroxide washing device further includes a second feed valve 142 disposed outside the filter press tank 1 , and the second feed valve 142 is connected to the first filter press sub-tank 14 .

[0037] By providing the second feed valve 142 , the first feed valve 141 is used to introduce the cobalt hydroxide material, and the second feed valve 142 is used to introduce the organic foaming agent, so as to facilitate the introduction of the cobalt hydroxide material and the foaming agent into the first filter press tank 14 .

[0038] In this embodiment, the cobalt hydroxide washing device further includes a third filter screen, the pore size of the third filter screen is smaller than or equal to the pore size of the second filter screen 13 , and the third filter screen is used to replace the first filter screen 11 .

[0039] Specifically, in the first step of filtration, the first filter screen 11 uses a first filter screen 11 with a pore size of 2-3 μm, and the second filter screen 13 uses a second filter screen 13 with a pore size of 0.2-0.5 μm. The first filter screen 11 and the second filter screen 13 are first installed in the filter press tank 1, so that when the pressing mechanism 2 of the first filter press tank 14 presses the cobalt hydroxide material, most of the cobalt hydroxide material is retained in the first filter press tank 14, and most of the soluble sodium salt soluble in water and part of the cobalt hydroxide material pass through the first filter screen 11 into the second filter press tank 16. Then, a partition 12 is inserted into the filter press tank 1, and the partition 12 is close to the pressing plate 21 in the second filter press sub-tank 16, so that the cobalt hydroxide material in the second filter press sub-tank 16 can be completely squeezed, and the pressing mechanism 2 of the second filter press sub-tank 16 squeezes the cobalt hydroxide material therein, and the second filter screen 13 can successfully intercept the cobalt hydroxide material, and at the same time, the soluble sodium salt is discharged from the second drain valve 171 with the water flow, and then the unloading hydraulic cylinder 32 drives the unloading plate 31 to open the opening in the vertical direction, and the cobalt hydroxide material on the unloading plate 31 is taken out and pulped. Next, in the second step of filtration, the first filter screen 11 is replaced by a third filter screen, and the third filter screen is selected to have a pore size of 0.2-0.5 μm. At the same time, the partition plate 12 is also installed in the filter press tank 1 to seal the first filter press sub-tank 14 and the second filter press sub-tank 16. Then, the pressing mechanism 2 of the first filter press sub-tank 14 presses the pulped cobalt hydroxide material, the third filter screen blocks the cobalt hydroxide material, and the water is drained through the first drain valve 151 to complete the washing of the cobalt hydroxide material.

[0040] In this embodiment, the cobalt hydroxide washing device also includes an aging kettle for receiving the cobalt hydroxide material after squeezing in the first filter press sub-tank and the second filter press sub-tank, and slurrying the cobalt hydroxide material. The aging kettle 4 includes a shell 41, a cover 42 and a stirring motor 43. A feed port is provided on one side of the shell 41, the cover 42 is connected to the feed port, and the stirring motor 43 is connected to the shell 41 and is used to stir the material in the shell 41.

[0041] The cobalt hydroxide material after the first step of filter pressing in the filter press tank 1 is taken out from the filter press tank 1 and placed in the aging kettle 4, and then water and nitrogen protective gas are injected into the shell 41, and the stirring motor 43 is turned on to make the cobalt hydroxide material after the first step of filter pressing into a slurry to better wash the cobalt hydroxide material, and then re-injected into the first filter press sub-tank 14 for the second step of filter pressing. It should be noted that the weight ratio of water to cobalt hydroxide material in the aging kettle 4 is 200-400:1 to better dissolve soluble impurities.

[0042] Preferably, a water inlet valve 44 is connected to the outside of the shell 41 , and the water inlet valve 44 is in communication with the inside of the shell 41 , so as to inject water into the shell 41 , thereby making the cobalt hydroxide material in the shell 41 into slurry.

[0043] Furthermore, an air intake valve 45 is connected to the outside of the shell 41 , and the air intake valve 45 is in communication with the inside of the shell 41 , so as to inject nitrogen protective gas into the shell 41 .

[0044] In this embodiment, a discharge valve 46 is connected to the outer side of the bottom of the shell 41 , and the discharge valve 46 is communicated with the inside of the shell 41 , so that the aging kettle 4 can discharge the cobalt hydroxide material from the discharge valve 46 after stirring the cobalt hydroxide material.

[0045] In summary, the utility model embodiment provides a cobalt hydroxide washing device. In the first step of filter pressing, the cobalt hydroxide material is filtered in the first filter pressing sub-tank and the second filter pressing sub-tank to remove most of the soluble sodium salts, and then the filtered cobalt hydroxide material is sent to the aging kettle for stirring and pulping. Specifically, the cobalt hydroxide material on the discharge plate 31 can be manually scraped out, the cover of the aging kettle is opened, and then the cobalt hydroxide material is poured into the shell for stirring and pulping; then in the second step of filter pressing, the pulped cobalt hydroxide material is sent to the first filter pressing sub-tank for filter pressing to further remove the soluble sodium salts and ensure the washing effect of the cobalt hydroxide material. Finally, the cobalt hydroxide material after the filter pressing is dried, and the yield of the cobalt hydroxide material is 95%, and the sodium ion content is 0.009%. Therefore, the cobalt hydroxide material of the present application can ensure the washing effect of the cobalt hydroxide material without multiple filter pressing and pulping, thereby saving water and reducing the loss of the cobalt hydroxide material.

[0046] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and substitutions can be made without departing from the technical principle of the present invention. These improvements and substitutions should also be regarded as the protection scope of the present invention.

Claims

1. A cobalt hydroxide washing device, characterized in that: The invention comprises a filter press tank, a material pressing mechanism and a discharge mechanism, wherein a first filter screen, a partition plate and a second filter screen are detachably connected in sequence from one side to the other side of the filter press tank, so as to separate the filter press tank from one side to the other side in sequence into a first filter press sub-tank, a first filter tank, a second filter press sub-tank and a second filter tank, a first feed valve, a first drain valve and a second drain valve corresponding to the first filter press sub-tank, the first filter tank and the second filter tank are arranged outside the filter press tank, the first filter press sub-tank and the second filter press sub-tank are both correspondingly provided with the material pressing mechanism for pressing materials and the discharge mechanism for discharging materials, and the aperture of the first filter screen is larger than the aperture of the second filter screen.

2. The cobalt hydroxide washing device according to claim 1, characterized in that: It also includes a hydraulic station, the material pressing mechanism includes a material pressing plate and a material pressing hydraulic cylinder, the first filter press sub-tank and the second filter press sub-tank are each provided with the material pressing plate, the outer edge of the material pressing plate in the first filter press sub-tank is close to the inner wall of the first filter press sub-tank, the outer edge of the material pressing plate in the second filter press sub-tank is close to the inner wall of the second filter press sub-tank, the material pressing hydraulic cylinder is connected to the side of the material pressing plate facing away from the filter press tank, the material pressing hydraulic cylinder is used to drive the material pressing plate to squeeze the material, and a hydraulic pipe is connected between the material pressing hydraulic cylinder and the hydraulic station.

3. The cobalt hydroxide washing device according to claim 2, characterized in that: The unloading mechanism includes a unloading plate and a unloading hydraulic cylinder. Openings are provided on one side of the first filter press sub-tank and the second filter press sub-tank, and the unloading plate is provided at the opening. The unloading hydraulic cylinder is connected to the side of the unloading plate facing away from the filter press tank to drive the unloading plate to open and close the opening. The hydraulic pipe is connected between the unloading hydraulic cylinder and the hydraulic station.

4. The cobalt hydroxide washing device according to claim 3, characterized in that: The pressing plate and the discharge plate of the first filter press sub-tank are located at the upper and lower sides of the first filter press sub-tank respectively, and the pressing plate and the discharge plate of the second filter press sub-tank are located at the upper and lower sides of the second filter press sub-tank respectively.

5. The cobalt hydroxide washing device according to claim 1, characterized in that: It also includes a second feed valve disposed outside the filter press tank, and the second feed valve is connected to the first filter press tank.

6. The cobalt hydroxide washing device according to claim 1, characterized in that: It also includes a third filter screen, the aperture of the third filter screen is smaller than or equal to the aperture of the second filter screen, and the third filter screen is used to replace the first filter screen.

7. The cobalt hydroxide washing device according to claim 1, characterized in that: It also includes an aging kettle for receiving the materials after squeezing in the first filter press sub-tank and the second filter press sub-tank and pulping the materials. The aging kettle includes a shell, a cover and a stirring motor. A feed port is opened on one side of the shell, the cover is connected to the feed port, and the stirring motor is connected to the shell and is used to stir the materials in the shell.

8. The cobalt hydroxide washing device according to claim 7, characterized in that: A water inlet valve is connected to the outside of the shell, and the water inlet valve is communicated with the inside of the shell.

9. The cobalt hydroxide washing device according to claim 7, characterized in that: An air intake valve is connected to the outside of the shell, and the air intake valve is communicated with the inside of the shell.

10. The cobalt hydroxide washing device according to claim 7, characterized in that: The outer side of the bottom of the shell is connected with a discharge valve, and the discharge valve is communicated with the inside of the shell.

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