CN116159667A - Method for reducing magnetic foreign matters in nickel cobalt manganese hydroxide slurry by introducing dispersion medium - Google Patents

Abstract

The invention discloses a method for reducing magnetic foreign matters in nickel cobalt manganese hydroxide slurry by introducing a dispersion medium, which comprises the following steps: s1, temporarily storing nickel cobalt manganese hydroxide slurry needing to be demagnetized in a slurry storage tank; s2, adding the dispersion medium in the medium storage tank into the slurry storage tank; s3, stirring nickel cobalt manganese hydroxide slurry added with a dispersion medium; s4, conveying the nickel cobalt manganese hydroxide slurry to a fluid iron remover group; s5, removing iron from the nickel cobalt manganese hydroxide slurry by using a fluid iron remover group; s6, conveying the nickel cobalt manganese hydroxide slurry after iron removal back to a slurry storage tank; s7, repeating the steps of S4-S6 until the content of the magnetic foreign matters in the nickel cobalt manganese hydroxide slurry reaches the standard; s8: and conveying the qualified nickel cobalt manganese hydroxide slurry to a post-process through a post-process pipeline. The scheme can quickly and effectively reduce the level of magnetic foreign matters in the slurry according to actual needs, can ensure that normal qualified materials are not influenced by high-magnetic materials, and simultaneously reduces the reworking cost of the high-magnetic materials on a production line.

Description

Method for reducing magnetic foreign matter in nickel-cobalt-manganese hydroxide slurry by introducing dispersion medium

technical field

The invention belongs to the technical field of removing magnetic foreign matter in nickel-cobalt-manganese hydroxide slurry, and in particular relates to a method for reducing magnetic foreign matter in nickel-cobalt-manganese hydroxide slurry by introducing a dispersion medium.

Background technique

With the expansion of production capacity of precursor materials and the increasingly stringent control requirements for metal foreign matter indicators, downstream battery manufacturers have increased requirements for magnetic foreign matter in positive electrode material precursors. At present, the level of magnetic foreign matter in the entire front-end process of precursor manufacturers is not stable enough. In view of the tight market conditions of raw materials, it is not conducive to effective control of raw material costs. In addition, nickel-cobalt-manganese hydroxide slurry with high magnetic foreign matter will be obtained during the process of washing centrifuge water and mother liquor recovery. When it is pumped back into the centrifuge for washing, the washed filter cake material also contains high magnetic foreign matter, and the electromagnetic separator in the back-end process has limited demagnetization effect, so it can only be put into the production line with a low mixing amount, and There is still the risk of increasing the magnetic foreign matter in the system and exceeding the standard of the product magnetic foreign matter.

Some precursor manufacturers specially design a production line for processing highly magnetic foreign matter materials, but this method is expensive, equipment operation costs are relatively high, and there is still a risk of foreign matter introduction, this method can only be used for dry materials. Secondary demagnetization, the wet materials being produced on the production line in the previous process cannot be processed, and can only be brought to the back-end process for blending or secondary demagnetization, and the recycling rate of intermediate materials is low.

At the same time, the general demagnetization method in the wet process section is to install one or more sets of pipeline iron removers, and use nickel-cobalt-manganese hydroxide slurry to demagnetize the slurry through pipeline iron removers during the production line transportation. The slurry passing through the pipeline can only be demagnetized once. If the slurry flows in the pipeline faster and the slurry is more viscous, the magnetic foreign matter adsorbed on the magnetic rod of the pipeline iron remover will be taken away. The pipeline iron remover It cannot achieve good results, and the slurry has entered the next process, resulting in the accumulation of magnetic foreign matter in the back-end process. The long-term high-magnetic material accumulation is difficult to clean inside the equipment, and the cost of cleaning and demagnetization is increased during the process of changing production lines.

In recent years, many precursor manufacturers have used circular demagnetization or diluted slurry concentration to improve the demagnetization effect. The method of diluting the slurry concentration will not only greatly increase the cost of washing and dehydration, but also cannot effectively reduce the nickel-cobalt-manganese hydroxide. The problem that the magnetic foreign matter caused by the agglomeration of particles is difficult to be absorbed by the pipeline iron remover. The method of cyclic demagnetization can effectively reduce the magnetic foreign matter in the nickel-cobalt-manganese hydroxide slurry and it needs to run for a long time. For the high content of magnetic foreign matter The demagnetization effect of the slurry is limited, and at the same time, the circulation system needs to be closed to increase the processing time when cleaning the iron remover of the pipeline, which does not meet the development requirements of the enterprise to promote cost reduction and quality improvement.

At present, leading power battery companies have changed the requirements for the content of magnetic foreign matter in positive electrode materials and their precursors to the requirements for the number of metal particles. The requirements for the control of magnetic metal foreign matter have been further improved, so the control of magnetic foreign matter still has a long way to go.

In view of the above problems, a method of introducing a dispersion medium to reduce magnetic foreign matter in nickel-cobalt-manganese hydroxide slurry is proposed.

Contents of the invention

In order to solve the above problems, the present invention provides a method of introducing a dispersion medium to reduce magnetic foreign matter in nickel-cobalt-manganese hydroxide slurry, which aims at the problem that the traditional method has limited demagnetization effect on slurry with high magnetic foreign matter content.

Embodiments of the invention are achieved through the following technical solutions:

A method for introducing a dispersion medium to reduce magnetic foreign matter in nickel-cobalt-manganese hydroxide slurry, comprising the following steps:

S1: Temporarily store the nickel-cobalt-manganese hydroxide slurry that needs to be demagnetized in the slurry storage tank;

S2: adding the dispersion medium in the medium storage tank into the slurry storage tank;

S3: Stirring has added the nickel-cobalt-manganese hydroxide slurry of the dispersion medium;

S4: transport the nickel cobalt manganese hydroxide slurry to the fluid iron remover group;

S5: The fluid iron remover group removes iron from the nickel-cobalt-manganese hydroxide slurry;

S6: the nickel-cobalt-manganese hydroxide slurry after iron removal is transported back in the slurry storage tank;

S7: Repeat the steps of S4-S6 until the content of magnetic foreign matter in the nickel-cobalt-manganese hydroxide slurry reaches the standard;

S8: Transport the qualified nickel-cobalt-manganese hydroxide slurry to the subsequent process through the subsequent process pipeline.

Further, a stirring device and a slurry pump are installed in the slurry storage tank to fully mix the dispersion medium with the nickel-cobalt-manganese hydroxide slurry.

Further, the medium storage tank is connected to the slurry storage tank, and a metering medium pump is installed in the medium storage tank, and the metering medium pump is convenient for controlling the addition amount of a single dispersion medium.

Further, one end of the fluid separator group communicates with the slurry storage tank through a feed pipe, and the other end communicates with the slurry storage tank through a return pipe, thereby forming a slurry circulation pipeline to demagnetize the slurry multiple times. Guaranteed demagnetization effect.

Further, the fluid iron remover group includes at least two fluid iron removers, and the fluid iron removers are connected in parallel, which can enhance the demagnetization effect.

Further, the feed pipe and the return pipe are provided with a blocking valve, and the fluid separator can be cleaned by closing the blocking valve.

Further, the post-processing pipeline is provided with a shut-off valve.

The technical solutions of the embodiments of the present invention have at least the following advantages and beneficial effects:

Compared with the general demagnetization method, this technical solution can quickly and effectively reduce the level of magnetic foreign matter in the slurry according to actual needs. Compared with high magnetic material mixed with low magnetic foreign matter material, on the one hand, it can ensure that normal qualified materials are not affected by high magnetic material. At the same time, it reduces the cost of reworking high magnetic materials on the production line. On the other hand, this kind of demagnetization scheme can be extended to the remelting system to reduce the pressure of raw material supply. The demagnetized slurry enters the subsequent process and qualified slurry The level of magnetic foreign matter in the material is equivalent, and it can enter the production line as normal material. The process route is relatively simple and the technical requirements are relatively low. It is suitable for popular use by general nickel-cobalt-manganese hydroxide manufacturing enterprises, and can effectively reduce the production cost of enterprises.

Description of drawings

In order to illustrate the technical solutions of the embodiments of the present invention more clearly, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention, and thus It should be regarded as a limitation on the scope, and those skilled in the art can also obtain other related drawings based on these drawings without creative work.

Fig. 1 is a schematic flow chart of the present invention.

Detailed ways

In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments It is a part of embodiments of the present invention, but not all embodiments. The components of the embodiments of the invention generally described and illustrated in the figures herein may be arranged and designed in a variety of different configurations.

Accordingly, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

It should be noted that like numerals and letters denote similar items in the following figures, therefore, once an item is defined in one figure, it does not require further definition and explanation in subsequent figures.

In the description of the present invention, it should be noted that if the orientation or positional relationship indicated by the terms "inside" and "outside" appears, it is based on the orientation or positional relationship shown in the drawings, or is the usual position of the inventive product when it is used. The orientation or positional relationship is only for the convenience of describing the present invention and simplifying the description, but does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be construed as limiting the scope of the present invention. limit.

In the description of the present invention, it also needs to be explained that, unless otherwise clearly stipulated and limited, if the terms "setting", "installation", "configuration" and "connection" appear, they should be understood in a broad sense, for example, it can be a fixed The connection can also be a detachable connection or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediary, and it can be the internal communication of two components. Those of ordinary skill in the art can understand the specific meanings of the above terms in the present invention in specific situations.

Please refer to FIG. 1 , this embodiment provides a method for introducing a dispersion medium to reduce magnetic foreign matter in nickel-cobalt-manganese hydroxide slurry.

In this embodiment, the magnetic foreign matter in the nickel-cobalt-manganese hydroxide slurry is removed according to the following steps:

S1: Confirm that pipelines such as iron remover, feed pipe, stop valve, slurry storage tank and return pipe are unobstructed;

S2: Check whether the stirring device in the slurry storage tank is operating normally, and the amount of dispersion medium is sufficient;

S3: Close the valve on the subsequent process pipeline, input the nickel-cobalt-manganese hydroxide slurry into the slurry storage tank, and start the stirring device;

S4: start the dispersion medium metering delivery pump, and add alcohol into the slurry storage tank according to a certain proportion;

S5: adding alcohol to the nickel-cobalt-manganese hydroxide slurry and stirring for 30 minutes;

S6: Start the slurry delivery pump to transport the slurry to the fluid iron remover through the feed pipe to remove magnetic foreign matter;

S7: The demagnetized slurry is returned to the slurry storage tank through the return pipe;

S8: Repeat S6-S7, and detect the content of magnetic foreign matter in the slurry every two hours. Until the content of magnetic foreign matter in the nickel-cobalt-manganese hydroxide slurry reaches the standard;

S9: Open the valve on the subsequent process pipeline, and transport the qualified nickel-cobalt-manganese hydroxide slurry to the next process.

In this embodiment, a stirring device and a slurry pump are installed in the slurry storage tank, the stirring device fully mixes the dispersion medium and the nickel-cobalt-manganese hydroxide slurry, and the slurry pump is used to drive the slurry to circulate in the pipeline . The dispersion medium storage tank is connected with the slurry storage tank and is used to store the dispersion medium. A medium metering pump is installed in the dispersion medium storage tank. The medium metering pump can not only transport the dispersion medium into the slurry storage tank, but also control the single The amount of dispersion medium added. One end of the fluid separator group communicates with the slurry storage tank through the feed pipe, and the other end communicates with the slurry storage tank through the return pipe to form a circulation pipeline for the nickel-cobalt-manganese hydroxide slurry, so that the nickel-cobalt-manganese hydroxide The slurry circulates and removes iron many times to ensure the effect of iron removal. The fluid iron remover can be selected according to actual needs. In this embodiment, the selected fluid iron remover is a pipeline iron remover. The fluid iron remover group is equipped with at least two pipeline iron removers, and the pipeline iron removers are connected in parallel to facilitate Without stopping the demagnetization cycle, it can clean up the magnetic particles attached to the magnetic rods of one of the pipeline iron removers, so that the iron remover can always maintain a high iron removal efficiency. Both the feeding pipe and the return pipe are equipped with blocking valves. When it is necessary to clean the iron remover in the pipeline, you only need to close the blocking valves on the feeding pipe and the return pipe so that the iron remover in the pipeline is independent, and the pipeline can be cleaned. The iron remover is cleaned.

In this embodiment, the selected dispersion medium is alcohol, and the concentration and dosage of alcohol are determined according to the actual needs of production. Because alcohol is volatile, the step of waste gas treatment should be added to the above steps to deal with the volatilized alcohol.

In this embodiment, after every cycle of demagnetization for 2 hours, samples were taken in the slurry storage tank to detect the content of magnetic foreign matter in the nickel-cobalt-manganese hydroxide slurry, and an appropriate amount of dispersant was added according to the actual demagnetization effect. When the test reaches the standard, open the shut-off valve on the subsequent process pipeline to transport the qualified nickel-cobalt-manganese hydroxide slurry to the next process.

In this embodiment, all valves and pumps are connected to the controller, which can realize automatic control and reduce manual operation in the production process.

The above are only preferred embodiments of the present invention, and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and changes. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims (7)

1. The method for reducing the magnetic foreign matters in the nickel cobalt manganese hydroxide slurry by introducing the dispersion medium is characterized by comprising the following steps of:

s1, temporarily storing nickel cobalt manganese hydroxide slurry needing to be demagnetized in a slurry storage tank;

s2, adding the dispersion medium in the medium storage tank into the slurry storage tank;

s3, stirring nickel cobalt manganese hydroxide slurry added with a dispersion medium;

s4, conveying the nickel cobalt manganese hydroxide slurry to a fluid iron remover group;

s5, removing iron from the nickel cobalt manganese hydroxide slurry by using a fluid iron remover group;

s6, conveying the nickel cobalt manganese hydroxide slurry after iron removal back to a slurry storage tank;

s7, repeating the steps of S4-S6 until the content of the magnetic foreign matters in the nickel cobalt manganese hydroxide slurry reaches the standard;

s8: and conveying the qualified nickel cobalt manganese hydroxide slurry to a post-process through a post-process pipeline.

2. The method of claim 1, wherein the step of determining the position of the substrate comprises,

and a stirring device and a slurry pump are arranged in the slurry storage tank.

3. The method of claim 1, wherein the step of determining the position of the substrate comprises,

the medium storage tank is communicated with the slurry storage tank, and a metering medium pump is arranged in the medium storage tank.

4. The method of claim 1, wherein the step of determining the position of the substrate comprises,

one end of the fluid iron remover set is communicated with the slurry storage tank through a feed pipe, and the other end of the fluid iron remover set is communicated with the slurry storage tank through a return pipe.

5. The method of claim 4, wherein the step of determining the position of the first electrode is performed,

the fluid iron remover group at least comprises two fluid iron removers, and the fluid iron removers are connected in parallel.

6. The method of claim 4, wherein the step of determining the position of the first electrode is performed,

and blocking valves are arranged on the feeding pipe and the return pipe.

7. The method of claim 1, wherein the step of determining the position of the substrate comprises,

and the post-process pipeline is provided with a stop valve.

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