System and method with reduction in moisture content and impurities of nickel-cobalt hydroxide

Abstract

The present invention relates to a system and method with a reduction in the moisture content and impurities of nickel-cobalt hydroxide. The system with a reduction in the moisture content and impurities of nickel-cobalt hydroxide comprises a thickener, a cleaning apparatus, a filter press apparatus, and an intermediate storage chamber. The cleaning apparatus comprises a housing, a stirring device, and a steam pipeline, wherein the housing is provided with a cleaning tank, and the housing is further provided with a feeding port, a steam inlet, and a discharging port which are in communication with the cleaning tank, the feeding port being in communication with the thickener, and the discharging port being connected to the filter press apparatus; the stirring device is arranged on the housing, the stirring device being used for stirring and washing materials in the cleaning tank; and the steam pipeline is wound on the periphery of the intermediate storage chamber, an outlet of the steam pipeline being in communication with the steam inlet, the steam pipeline being used for conveying steam into the cleaning tank after heat exchange with the materials in the intermediate storage chamber. In the present invention, by passing materials through the thickener, the cleaning apparatus, and the filter press apparatus, and using steam to exchange heat with the materials in the intermediate storage chamber, the moisture content and impurities of nickel-cobalt hydroxide are further reduced, facilitating subsequent processing.

Description

A system and method for reducing the moisture content and impurities of nickel cobalt hydroxide Technical Field

[0001] The present invention relates to the technical field of laterite nickel ore processing equipment, and in particular to a system and method for reducing the moisture content and impurities of nickel cobalt hydroxide. Background Art

[0002] At present, the precipitation of nickel and cobalt in the hydrometallurgical smelting of laterite nickel ore generally includes the following steps: first, acid leaching the laterite nickel ore; then, using sodium hydroxide as a precipitant to precipitate the nickel and cobalt in the acid leaching solution to form a nickel-cobalt precipitate; and then, concentrating the nickel-cobalt precipitate to obtain a nickel-cobalt hydroxide precipitate.

[0003] Patent CN 113564383 A discloses a system and process for two-stage pressurized extraction of nickel and cobalt from laterite nickel ore. The system comprises a high-pressure acid leaching unit, a high-pressure neutralization unit, a neutralization and impurity removal unit, and a nickel-cobalt precipitation unit. In the nickel-cobalt extraction process, the slurry treated by the high-pressure acid leaching unit is directly transported to the high-pressure neutralization unit, where it is coordinated with the added serpentine slurry for high-pressure neutralization, followed by neutralization and impurity removal and nickel-cobalt precipitation.

[0004] However, the nickel-cobalt hydroxide precipitate after filtration in the nickel-cobalt precipitation unit in the above-mentioned prior art contains impurities and a high water content, which is not conducive to subsequent treatment.

[0005] Summary of the Invention

[0006] In view of this, it is necessary to provide a system and method for reducing the water content and impurities of nickel cobalt hydroxide, so as to solve the technical problem in the prior art that the nickel cobalt hydroxide precipitate after filtration through the nickel cobalt precipitation unit contains impurities and a high water content, which is not conducive to subsequent processing.

[0007] The present invention provides a system for reducing the moisture content and impurities of nickel cobalt hydroxide, the system for reducing the moisture content and impurities of nickel cobalt hydroxide comprising a thickener, a cleaning device, a filter press and a transfer silo arranged in sequence along the slurry conveying direction;

[0008] In which, the cleaning equipment includes a shell, a stirring device, a water source device and a steam pipe. The shell is provided with a cleaning tank. The shell is also provided with a feed port, a steam inlet and a discharge port connected to the cleaning tank. The feed port of the shell is connected to the discharge port of the thickener, and the discharge port of the shell is connected to the filter press equipment. The stirring device is provided in the shell, and the stirring device is used to stir and wash the material in the cleaning tank. The water source device is used to inject water into the cleaning tank. The steam pipe is arranged around the outer periphery of the transfer silo, and the outlet of the steam pipe is connected to the steam inlet. The steam pipe is used to exchange heat with the material in the transfer silo and then transport it to the cleaning tank.

[0009] Optionally, the housing is further provided with an additive inlet connected to the cleaning tank, and the additive inlet is used for allowing additives to be put into the cleaning tank.

[0010] Optionally, the system for reducing the moisture content and impurities of nickel cobalt hydroxide further includes a heating device, which is provided corresponding to the filter press equipment and is used to evaporate moisture from the material filtered by the filter press equipment to reduce the moisture content of the material.

[0011] Optionally, the heating device includes a hot air blower.

[0012] Optionally, the steam pipe is spirally wound around the outer circumference of the transfer silo.

[0013] Optionally, the steam pipe includes a water inlet pipe, multiple connecting pipes and a water outlet pipe, and the multiple connecting pipes are arranged at intervals along the circumference of the transfer silo, each of the connecting pipes extends in the vertical direction, one end of each connecting pipe is provided with an inlet, and the other end of the connecting pipe is provided with an outlet, the water inlets and water outlets of each two adjacent connecting pipes are arranged in opposite directions, and the inlets of the connecting pipes are connected to the outlets of adjacent connecting pipes, and the water inlet pipe and the water outlet pipe are respectively connected to the connecting pipes located at both ends of the multiple connecting pipes.

[0014] Optionally, the stirring device includes a mounting bracket, a stirring blade and a drive motor, the mounting bracket is provided on the shell, the stirring blade is rotatably mounted on the mounting bracket along a vertical axis, and the stirring blade extends into the cleaning tank, and the drive motor is connected to the stirring blade for driving the stirring blade to rotate.

[0015] Optionally, the filter press equipment includes a plate and frame filter press.

[0016] Optionally, the feed port and the water inlet are located at the bottom of the cleaning tank, and the discharge port is located above the cleaning tank.

[0017] In addition, the present invention also provides a method for reducing the moisture content and impurities of nickel cobalt hydroxide, comprising the following steps:

[0018] Step 1: thickening: transporting the slurry to the thickener for thickening to obtain a nickel cobalt hydroxide slurry with a higher concentration;

[0019] Step 2: Cleaning and removing impurities: transporting the nickel cobalt hydroxide slurry in step 1 to a cleaning tank, injecting water and additives into the cleaning tank, and stirring and washing the nickel cobalt hydroxide slurry with the stirring device to remove impurities to obtain a de-impurified nickel cobalt hydroxide slurry;

[0020] Step 3, filter pressing: transporting the impurity-removed nickel cobalt hydroxide slurry in step 2 to the filter pressing equipment, and filtering the impurity-removed nickel cobalt hydroxide slurry through the filter pressing equipment to obtain nickel cobalt hydroxide;

[0021] Step 4, heating and evaporation: evaporating the water from the nickel cobalt hydroxide obtained in step 3 by the heating device to reduce the water content of the nickel cobalt hydroxide, and transporting it to the transfer silo;

[0022] Step 5, secondary evaporation: performing secondary water evaporation on the nickel cobalt hydroxide in the transfer silo through the steam pipeline.

[0023] Optionally, in step 2, the additives include a dispersant and a filter aid.

[0024] Compared with the prior art, the system for reducing the moisture content and impurities of nickel cobalt hydroxide provided by the present invention comprises a thickener, a cleaning device, a filter press and a transfer silo arranged in sequence along the slurry conveying direction, a steam pipe wrapped around the outer periphery of the transfer silo, and the outlet of the steam pipe is connected to the steam inlet, and the inlet of the steam pipe is connected to the equipment for generating secondary steam in the high-pressure smelting area. When in use, the slurry is first conveyed to the thickener, and the material slurry is thickened by the thickener to reduce the moisture content of the material. The material with reduced moisture content is then conveyed from the discharge port of the thickener to the cleaning tank, injected into the cleaning tank through a water source device, stirred and washed by a stirring device, and then conveyed to the filter press to filter the material to further reduce the moisture content of the material, and finally conveyed to the transfer silo. The material in the transfer silo is heat exchanged by the thickener, cleaning device, filter press and steam, thereby further reducing the moisture content and impurities of the material, which is beneficial to subsequent processing.

[0025] The steam pipe is arranged around the outer circumference of the transfer silo, and the outlet of the steam pipe is connected with the steam inlet. Since the steam temperature is relatively high and the temperature of the material in the transfer silo is lower than the temperature of the steam, the secondary steam generated in the high-pressure smelting area exchanges heat with the material in the transfer silo when flowing around the transfer silo through the steam pipe, thereby increasing the temperature of the material in the transfer silo, thereby evaporating the moisture of the material in the transfer silo to further reduce the moisture content of the material. After the heat exchange with the material in the transfer silo, the steam still has a relatively high temperature, so the steam with a relatively high temperature eventually enters the cleaning tank from the outlet of the steam pipe, thereby increasing the temperature in the cleaning tank and enhancing the stirring and washing effect. The source of the steam is the useless steam generated in the high-pressure smelting area. By reusing the steam, the energy consumption of the entire equipment is reduced, saving energy and reducing emissions.

[0026] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention and to implement it according to the contents of the description, the preferred embodiments of the present invention are described in detail below with reference to the accompanying drawings. The specific implementation methods of the present invention are given in detail by the following embodiments and the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of this application. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0028] FIG1 is a schematic structural diagram of a first embodiment of a system for reducing the moisture content and impurities in nickel cobalt hydroxide provided by the present invention;

[0029] FIG2 is a process flow chart of the system for reducing the moisture content and impurities of nickel cobalt hydroxide in FIG1 .

[0030] Explanation of the accompanying symbols: 1-thickener, 2-cleaning equipment, 21-cleaning tank, 22-stirring equipment, 23-steam pipe, 24-water source device, 3-filter press equipment, 4-transfer silo, 5-heating device. DETAILED DESCRIPTION

[0031] The preferred embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings, wherein the accompanying drawings constitute a part of this application and are used together with the embodiments of the present invention to illustrate the principles of the present invention, and are not used to limit the scope of the present invention.

[0032] Please refer to Figures 1 and 2. The system for reducing the moisture content and impurities of nickel cobalt hydroxide includes a thickener 1, a cleaning device 2, a filter press 3 and a transfer silo 4 arranged in sequence along the slurry conveying direction; wherein, the cleaning device 2 includes a shell, a stirring device, a water source device 24 and a steam pipe 23, the shell is provided with a cleaning tank 21, and the shell is also provided with a feed port, a steam inlet and a discharge port connected to the cleaning tank 21. The feed port of the shell is connected to the discharge port of the thickener 1, and the discharge port of the shell is connected to the filter press 3. The stirring device is provided in the shell, and the stirring device is used to stir and wash the material in the cleaning tank 21. The water source device 24 is used to inject water into the cleaning tank 21. The steam pipe 23 is arranged around the outer periphery of the transfer silo 4, and the outlet of the steam pipe 23 is connected to the steam inlet. The steam pipe 23 is used to heat exchange the secondary steam generated in the high-pressure smelting area with the material in the transfer silo 4 and then transport it to the cleaning tank 21.

[0033] The system for reducing the moisture content and impurities of nickel cobalt hydroxide provided by the present invention comprises a thickener 1, a cleaning device 2, a filter press 3 and a transfer silo 4 arranged in sequence along the slurry conveying direction, a steam pipe 23 wound around the periphery of the transfer silo 4, the outlet of the steam pipe 23 being connected to the steam inlet, and the inlet of the steam pipe 23 being connected to the equipment for generating secondary steam in the high-pressure smelting area. When in use, the slurry (i.e. nickel cobalt hydroxide with a higher moisture content) is first conveyed to the thickener 1, and the material slurry is thickened by the thickener 1 to reduce the moisture content and impurities of the nickel cobalt hydroxide. The material with reduced moisture content is then transported from the discharge port of the thickener 1 to the cleaning tank 21, injected into the cleaning tank 21 through the water source device 24, and stirred and washed by the stirring device, and then transported to the filter press equipment 3, where the material is filter-filtered to further reduce the moisture content of the material, and finally transported to the transfer silo 4. The material in the transfer silo 4 is subjected to heat exchange by the thickener 1, the cleaning device 2, the filter press equipment 3, and steam, thereby further reducing the moisture content and impurities of the material, which is beneficial to subsequent processing.

[0034] The steam pipe 23 is arranged around the outer circumference of the transfer silo 4, and the outlet of the steam pipe 23 is connected to the steam inlet. Since the steam temperature is relatively high and the temperature of the material in the transfer silo 4 is lower than the temperature of the steam, the secondary steam generated in the high-pressure smelting area flows around the transfer silo 4 through the steam pipe 23, and heat exchange occurs with the material in the transfer silo 4, thereby increasing the temperature of the material in the transfer silo 4, thereby evaporating the moisture of the material in the transfer silo 4, thereby further reducing the moisture content of the material. After the heat exchange with the material in the transfer silo 4, the steam still has a relatively high temperature, so the steam with a relatively high temperature eventually enters the cleaning tank 21 from the outlet of the steam pipe 23, thereby increasing the temperature in the cleaning tank 21 and enhancing the stirring and washing effect. The source of the steam is the useless steam generated in the high-pressure smelting area. By recycling the steam, the energy consumption of the entire equipment is reduced, saving energy and reducing emissions.

[0035] It should be noted that in the hydrometallurgical smelting of laterite nickel ore, after the nickel-cobalt precipitation process is completed, the resulting slurry is a solid-liquid mixture, with the solid portion comprising nickel hydroxide, cobalt hydroxide, and a mixture thereof. These three hydroxides are the final desired materials.

[0036] Furthermore, in this embodiment, the thickener 1 includes a cylinder, which is arranged in a conical shape, and is provided with a accommodating chamber. The cylinder is also provided with a slurry inlet and a slurry outlet, and the slurry inlet and the slurry outlet are both connected to the accommodating chamber, and the slurry inlet is located at the upper end part of the cylinder, and the slurry outlet is located at the conical bottom of the cylinder. During specific use, the slurry obtained after a nickel-cobalt precipitation process contains a large amount of water, and the slurry is transported to the accommodating chamber through the slurry inlet. Since the slurry is a solid-liquid mixture, the solid part of the slurry gradually settles downward in the accommodating chamber with the help of its own gravity, so that the slurry is divided into two parts: clarified liquid and high-concentration precipitate. The clarified liquid gradually flows out of the accommodating chamber through the overflow port, and the high-concentration precipitate part at the bottom is transported to the cleaning equipment 2 through the slurry outlet. The water content of the slurry is greatly reduced through the thickening effect of the thickener 1.

[0037] Furthermore, in this embodiment, the shell is also provided with an additive inlet connected to the cleaning tank 21, and the additive inlet is used for allowing additives to be put into the cleaning tank 21. By adding the additives into the cleaning tank 21, the efficiency and effect of stirring washing can be improved.

[0038] Furthermore, in this embodiment, the shell is also provided with a water inlet, which is connected to the cleaning tank 21. The water source device 24 is connected to the water inlet to inject water into the cleaning tank 21 through the water inlet to facilitate stirring and cleaning of the material slurry.

[0039] Furthermore, after the filter press 3 squeezes and filters the material, the material still contains a lot of water. In order to further remove the water in the material, the system for reducing the water content and impurities of nickel cobalt hydroxide also includes a heating device 5. The heating device 5 is set corresponding to the filter press 3. The heating device 5 is used to evaporate the water of the material after the filter press 3 is filtered to reduce the water content of the material. In specific use, after the material is filtered by the filter press 3, the heating device 5 continuously heats the material to increase the temperature of the material, thereby promoting the evaporation of water in the material to reduce the water content of the material.

[0040] Furthermore, the specific form of the heating device 5 is not limited, as long as it can evaporate the moisture from the material after the filter press. In this embodiment, the heating device 5 includes a hot air blower. The hot air blower continuously blows hot air toward the material. On the one hand, the hot air transfers heat to the material, raising the temperature of the material, which is conducive to the evaporation of moisture in the material. On the other hand, the air flow also accelerates the evaporation of moisture, thereby improving the efficiency of evaporation and enhancing the evaporation effect.

[0041] Furthermore, the specific form in which the steam pipe 23 is wound around the outer periphery of the transfer silo 4 is not limited. In this embodiment, the steam pipe 23 is spirally wound around the outer periphery of the transfer silo 4. The spiral winding method increases the contact area between the steam pipe 23 and the transfer silo 4, improves the steam utilization rate, and thus improves the evaporation effect. Specifically, the transfer silo 4 is configured as a whole in a cylindrical shape. The system for reducing the moisture content and impurities of nickel cobalt hydroxide also includes a plurality of mounting racks, each of which is provided on the outer side wall of the transfer silo 4. The plurality of mounting racks are arranged in a spiral pattern at intervals. The steam pipe 23 is installed on the plurality of mounting racks so that the steam pipe 23 is installed on the outer side wall of the transfer silo 4 through the mounting racks.

[0042] Furthermore, the steam pipe 23 is arranged to fit closely with the outer wall of the transfer silo 4, so that the heat conduction effect is better.

[0043] Furthermore, the material of the transfer silo 4 is not specifically limited. In this embodiment, the material of the transfer silo 4 is a material with good thermal conductivity.

[0044] Furthermore, an exhaust hole is provided on the top of the transfer silo 4, which is connected to the space inside the transfer silo 4. The exhaust hole is used to discharge the steam generated when the nickel cobalt hydroxide in the transfer silo 4 is heated by water vapor.

[0045] Furthermore, the system for reducing the moisture content and impurities in nickel cobalt hydroxide further includes a thermal insulation sleeve, which is disposed on the outer periphery of the steam pipe 23 to simultaneously enclose the steam pipe 23 and the transfer silo 4 within the thermal insulation sleeve, thereby preventing heat loss. The thermal insulation sleeve is made of a thermally insulating material.

[0046] In another embodiment, the steam pipe 23 includes an inlet pipe, multiple connecting pipes, and an outlet pipe. The multiple connecting pipes are arranged at intervals along the circumference of the transfer silo 4. Each connecting pipe extends vertically, has an inlet at one end, and an outlet at the other end. The inlets and outlets of two adjacent connecting pipes are arranged in opposite directions, and the inlets of the connecting pipes are connected to the outlets of adjacent connecting pipes. The inlet pipe and the outlet pipe are respectively connected to the connecting pipes at both ends of the multiple connecting pipes. This arrangement can also increase the contact area between the steam pipe 23 and the transfer silo 4, improving heat exchange efficiency.

[0047] Furthermore, in this embodiment, the stirring device includes a mounting bracket, a stirring blade, and a drive motor. The mounting bracket is provided on the housing. The stirring blade is rotatably mounted on the mounting bracket along a vertical axis, and the stirring blade extends into the cleaning tank 21. The drive motor is connected to the stirring blade to drive the stirring blade to rotate. Specifically, a mounting hole is provided on the top of the housing. The stirring blade extends into the cleaning tank 21 through the mounting hole. The stirring blade is rotatably arranged along a vertical axis. The mounting bracket is provided on the top of the housing. The drive motor is connected to the stirring blade to drive the stirring blade to rotate.

[0048] Furthermore, the specific form of the filter press equipment 3 is not limited. In this embodiment, the filter press equipment 3 includes a plate and frame filter press.

[0049] Furthermore, in this embodiment, the feed port and the water inlet are located at the bottom of the cleaning tank 21 , and the discharge port is located above the cleaning tank 21 .

[0050] In addition, the present invention also provides a method for reducing the moisture content and impurities of nickel cobalt hydroxide, comprising the following steps:

[0051] Step 1: thickening: transporting the slurry to the thickener 1 for thickening to obtain a nickel cobalt hydroxide slurry with a higher concentration;

[0052] Step 2: Cleaning and removing impurities: transporting the nickel cobalt hydroxide slurry in step 1 to a cleaning tank 21, injecting water and additives into the cleaning tank 21, and stirring and washing the nickel cobalt hydroxide slurry with the stirring device to remove impurities, thereby obtaining a de-impurified nickel cobalt hydroxide slurry;

[0053] Step 3, filter pressing: transporting the impurity-removed nickel cobalt hydroxide slurry in step 2 to the filter press equipment 3, and filtering the impurity-removed material slurry through the filter press equipment 3 to obtain nickel cobalt hydroxide;

[0054] Step 4, heating and evaporation: The nickel cobalt hydroxide obtained in step 3 is evaporated by the heating device 5 to reduce the water content of the nickel cobalt hydroxide, and then transported to the transfer silo 4;

[0055] Step 5, secondary evaporation: The nickel cobalt hydroxide in the transfer silo 4 is subjected to secondary water evaporation through the steam pipe 23 .

[0056] Furthermore, in step one, the nickel cobalt hydroxide slurry obtained after a nickel cobalt precipitation process is transported from the feed port of the thickener 1 to the thickener 1. The solid part in the nickel cobalt hydroxide slurry gradually settles to the bottom of the thickener 1 under the action of its own gravity. At this time, the bottom of the thickener 1 is a nickel cobalt hydroxide slurry with a higher concentration. The water content of the nickel cobalt hydroxide slurry is reduced through the thickening treatment of the thickener 1.

[0057] Furthermore, in step 2, the nickel cobalt hydroxide slurry with a higher concentration obtained after thickening by the thickener 1 is transported from the feed port to the cleaning tank 21, and then water is injected into the cleaning tank 21, and the additive is added, and then the stirring device 22 is started to stir and wash the nickel cobalt hydroxide slurry in the cleaning tank 21 to remove impurities in the nickel cobalt hydroxide slurry.

[0058] Furthermore, in this embodiment, in step 2, the additives include a dispersant and a filter aid. By adding the dispersant and the filter aid, impurities in the nickel-cobalt hydroxide slurry can be effectively removed, thereby improving the decontamination effect.

[0059] Furthermore, in step three, the nickel cobalt hydroxide slurry after impurities removal is transported to the plate and frame filter press, and further extrusion filtration is performed by the plate and frame filter press to further reduce the water content of the nickel cobalt hydroxide.

[0060] Furthermore, in step 4, the filter cake obtained after filtration by the plate and frame filter press is heated by the hot air blower to promote evaporation of water in the filter cake and reduce its moisture content.

[0061] Furthermore, in step five, the nickel cobalt hydroxide slurry in the transfer silo 4 is continued to be heated by the high-temperature steam in the steam pipe 23, so that the water in the nickel cobalt hydroxide continues to evaporate and its water content is reduced as much as possible. Due to subsequent treatment, such an arrangement, through operations such as thickening, washing, filter pressing, and heating, the nickel cobalt hydroxide finally obtained can have a lower water content.

[0062] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by any technician familiar with this technical field within the technical scope disclosed by the present invention should be covered by the scope of protection of the present invention.

Claims

1. A system for reducing the water content and impurities of nickel cobalt hydroxide, characterized in that: It includes a thickener, a cleaning device, a filter press device and a transfer silo arranged in sequence along the slurry conveying direction; Among them, the cleaning equipment includes a shell, a stirring device, a water source device and a steam pipe. The shell is provided with a cleaning tank. The shell is also provided with a feed port, a steam inlet and a discharge port connected to the cleaning tank. The feed port of the shell is connected to the discharge port of the thickener, and the discharge port of the shell is connected to the filter press equipment. The stirring device is arranged in the shell, and the stirring device is used to stir and wash the material in the cleaning tank. The water source device is used to inject water into the cleaning tank. The steam pipe is arranged around the outer periphery of the transfer silo, and the outlet of the steam pipe is connected to the steam inlet. The steam pipe is used to transport the steam to the cleaning tank after heat exchange with the material in the transfer silo.

2. The system for reducing the water content and impurities of nickel cobalt hydroxide according to claim 1, characterized in that: The shell is also provided with an additive inlet connected to the cleaning tank, and the additive inlet is used for allowing additives to be put into the cleaning tank.

3. The system for reducing the water content and impurities of nickel cobalt hydroxide according to claim 1, characterized in that: The system for reducing the moisture content and impurities of nickel cobalt hydroxide also includes a heating device, which is arranged corresponding to the filter press equipment and is used to evaporate water from the material after filtering by the filter press equipment to reduce the moisture content of the material.

4. The system for reducing the water content and impurities of nickel cobalt hydroxide according to claim 3, characterized in that: The heating device comprises a hot air blower.

5. The system for reducing the water content and impurities of nickel cobalt hydroxide according to claim 1, characterized in that: The steam pipe is spirally wound around the outer circumference of the transfer silo.

6. The system for reducing the water content and impurities of nickel cobalt hydroxide according to claim 1, characterized in that: The steam pipeline includes a water inlet pipe, a plurality of connecting pipes and a water outlet pipe. The plurality of connecting pipes are arranged at intervals along the circumference of the transfer silo. Each of the connecting pipes extends in a vertical direction. An inlet is provided at one end of each connecting pipe, and an outlet is provided at the other end of the connecting pipe. The water inlets and water outlets of each two adjacent connecting pipes are arranged in opposite directions, and the inlets of the connecting pipes are connected to the outlets of adjacent connecting pipes. The water inlet pipe and the water outlet pipe are respectively connected to the connecting pipes at both ends of the plurality of connecting pipes.

7. The system for reducing the water content and impurities of nickel cobalt hydroxide according to claim 1, characterized in that: The stirring device includes a mounting bracket, a stirring blade and a driving motor. The mounting bracket is arranged on the shell. The stirring blade is rotatably mounted on the mounting bracket along a vertical axis, and the stirring blade extends into the cleaning tank. The driving motor is connected to the stirring blade for driving the stirring blade to rotate.

8. The system for reducing the water content and impurities of nickel cobalt hydroxide according to claim 1, characterized in that: The filter press equipment comprises a plate and frame filter press.

9. The system for reducing the water content and impurities of nickel cobalt hydroxide according to claim 1, characterized in that: The feed inlet and the water inlet are located at the bottom of the cleaning tank, and the discharge port is located above the cleaning tank.

10. A method for reducing the water content and impurities of nickel cobalt hydroxide, characterized in that: The following steps are involved: Step 1, thickening: conveying the slurry to the thickener for thickening to obtain a nickel cobalt hydroxide slurry with a higher concentration; Step 2, cleaning and impurity removal: transporting the nickel cobalt hydroxide slurry in step 1 to a cleaning tank, injecting water and additives into the cleaning tank, and stirring and washing the nickel cobalt hydroxide slurry by the stirring device to remove impurities, thereby obtaining a de-impurified nickel cobalt hydroxide slurry; Step 3, filter pressing: conveying the impurity-removed nickel cobalt hydroxide slurry in step 2 to the filter pressing equipment, and filtering the impurity-removed nickel cobalt hydroxide slurry through the filter pressing equipment to obtain nickel cobalt hydroxide; Step 4, heating and evaporation: evaporating the water of the nickel cobalt hydroxide obtained in step 3 by the heating device to reduce the water content of the nickel cobalt hydroxide, and transporting it to the transfer silo; Step 5: Secondary evaporation: The nickel and cobalt hydroxide in the transfer silo is evaporated by the steam pipeline. The water evaporates.

11. The method for reducing the water content and impurities of nickel cobalt hydroxide according to claim 10, characterized in that: In step 2, the additives include dispersants and filter aids.

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