CN111250261A

CN111250261A - Pipeline for removing magnetic impurities and method for removing magnetic impurities in material

Info

Publication number: CN111250261A
Application number: CN201911052070.0A
Authority: CN
Inventors: 刘龙波; 张保
Original assignee: Ningbo Cian Electromechanical Co Ltd
Current assignee: Ningbo Cian Electromechanical Co Ltd
Priority date: 2019-10-25
Filing date: 2019-10-31
Publication date: 2020-06-09

Abstract

The invention relates to the field of demagnetization, and discloses a pipeline for removing magnetic impurities and a method for removing the magnetic impurities in a material. The pipeline for removing the magnetic impurities comprises a pipeline main body, a channel through which fluid or powder can flow is formed in the pipeline main body, a magnetic force piece is sealed in the channel, and the magnetic pole direction of the magnetic force piece is parallel to the flow direction of the channel. The pipeline is beneficial to improving the effect of removing magnetic impurities.

Description

Pipeline for removing magnetic impurities and method for removing magnetic impurities in material

Technical Field

The invention relates to the field of removing magnetic impurities, and discloses a pipeline for removing magnetic impurities and a method for removing the magnetic impurities in a material.

Background

With the upgrade of the industry in China, the quality requirements of various industries on products are higher and higher, and the requirements on the purity of raw materials are also higher and higher, especially on metal impurities.

Particularly in the field of lithium ion batteries, as the application range of the lithium ion batteries is more and more extensive, the safety of the lithium ion batteries is more and more emphasized by people, and particularly, the lithium ion batteries adopt ternary materials as anode materials, and the magnetic impurities in the raw materials of the high-rate lithium ion batteries can cause the lithium ion batteries to have accidents of self-discharge, overheating, even combustion and explosion and the like, so that the removal or reduction of the content of the magnetic impurities in the raw materials of the lithium ion batteries has a remarkable significance in improving the application safety of the lithium ion batteries.

The manufacturing process of the raw material of the ternary cathode material is mainly as follows: dissolving elements in the ore into the solution, carrying out liquid phase chemical reaction on the three elements to generate a precursor of solid particles, and carrying out the working procedures of sintering, crushing and the like to form the ternary cathode material. In the preparation process of the ternary cathode material, magnetic substances from processing equipment and environment are continuously mixed into the material, so that the content of magnetic impurities is overhigh.

In the research process of the invention, the inventor analyzes the source of the magnetic substance in the precursor in the process of analyzing, researching and improving the raw material of the lithium battery anode material and improving the content of the magnetic impurities in the precursor, finds that the content of the magnetic substance in the solution or slurry of the ternary material synthetic precursor is high, and can remove the magnetic impurities by adopting a pipeline type iron remover, but the inventor finds that the pipeline type iron remover in the prior art has poor magnetism removing effect in the research process of the invention, and mainly has the following defects:

1. the magnetic field blind area is larger, the probability of magnetic substance escape is high, and the requirement of low content of magnetic substance cannot be met.

2. The structure of the existing iron remover is complex, more manpower and material resources need to be consumed for cleaning the adsorbed magnetic impurities, and the cleaning is not clean.

Disclosure of Invention

An object of the embodiments of the present invention is to provide a pipeline for removing magnetic impurities, which is beneficial to improve the demagnetization efficiency and improve the reliability and stability of the deferrization effect.

Another object of the embodiments of the present invention is to provide a method for removing magnetic impurities in a material by using a pipeline for removing magnetic impurities, which is beneficial to improve the demagnetization efficiency and improve the reliability and stability of the deferrization effect.

In a first aspect, an embodiment of the present invention provides a pipe for removing magnetic impurities, including: the pipeline comprises a pipeline main body, wherein a channel through which fluid or powder can flow is formed in the pipeline main body, a magnetic part is sealed in the channel, and the magnetic pole direction of the magnetic part is parallel to the flow direction of the channel.

Optionally, the magnetic member comprises:

a package body made of a non-magnetic conductive material;

at least two magnets, each of which is arranged in a row along the flow direction of the channel, each of which is encapsulated on the encapsulation body, the magnetic pole direction of each of the magnets is parallel to the flow direction of the channel,

in the row of the magnets, opposite ends of any two adjacent magnets are of like-name poles and have a predetermined gap.

Optionally, at least one end of the package body located at two ends of the arrangement direction of the magnets is further provided with: and a tapered part which is made of non-magnetic material and gradually becomes narrower in outer diameter towards the tail end direction, and the tapered part is empty or is made of non-magnetic material.

Alternatively, each of the magnets is arranged in a row in sequence along the flow direction of the channel,

optionally, each of the magnets is solid and cylindrical, and the axial direction of each of the magnets is parallel to the flow direction of the channel.

Optionally, the axial length of the magnet is 24.3mm, and the cross section of the magnet perpendicular to the axial direction is a circle with a diameter of 24 mm.

Optionally, the direction of the magnetic field gradient within the channel intersects the flow direction of the channel.

Optionally, the magnet is a permanent magnet.

Optionally, at least one of two ends of the magnetic member along the flow direction of the channel is further provided with: and a tapered part which is made of non-magnetic material and gradually becomes narrower in outer diameter towards the tail end direction, and the tapered part is empty or is made of non-magnetic material.

11. The pipe for removing magnetic impurities as claimed in any one of claims 1 to 10,

the magnetic valve is characterized in that a cavity is further arranged in the channel, the cavity is not communicated with the channel, and the magnetic part is sealed in the cavity.

12. The pipe for removing magnetic impurities as claimed in any one of claims 1 to 10,

and the inlet and the outlet which are arranged on the pipeline main body are respectively positioned at two sides of the channel.

13. The pipe for removing magnetic impurities as claimed in claim 1,

the channel gaps are the same everywhere in the channel.

14. The pipe for removing magnetic impurities as claimed in claim 1,

the channel gaps at various positions in the channel are different.

15. The pipe for removing magnetic impurities as claimed in claim 1,

the pipeline main body is made of non-magnetic materials.

16. The pipe for removing magnetic impurities according to claim 15,

the pipeline main body is a stainless steel pipe or a nonmetallic plastic pipeline.

17. The pipe for removing magnetic impurities as claimed in claim 1,

the magnetic part is a permanent magnetic part.

A method for removing magnetic impurities from a slurry using the pipe for removing magnetic impurities of any one of claims 1 to 17, comprising:

and introducing a material into the channel, wherein the magnetic impurities in the material are attached to the outside of the magnetic piece under the action of magnetic force.

19. The method of removing magnetic impurities from a material as claimed in claim 18,

a cavity is also arranged in the channel, the cavity is not communicated with the channel, the magnetic member is sealed in the cavity,

the magnetic impurities are attached to the outer wall of the chamber under the action of magnetic force,

when the magnetic impurities attached to the outer wall of the chamber are accumulated to a predetermined degree, after the fluid or powder is discharged, the method further comprises the following steps:

and taking out the magnetic member from the chamber, introducing high-speed flushing liquid into the channel, and cleaning the channel.

20. The method for removing magnetic impurities from a slurry according to claim 18,

at least one end of the two ends of the magnetic member along the flow direction of the channel is further provided with: a tapered portion made of a non-magnetic material and having an outer diameter gradually narrowed toward a distal end, the tapered portion being empty or non-magnetic material therein,

the magnetic impurities are attached to the outside of the magnetic element under the action of magnetic force,

when the magnetic impurities attached to the outer wall of the chamber are accumulated to a predetermined degree, further comprising:

taking out the magnetic piece from the channel, pushing the magnetic impurities outside the permanent magnetic piece to the tail end of the conical part, and removing the magnetic impurities at the tail end of the conical part

As can be seen from the above, through the research on the background magnetic field formed by the flow field of the fluid (liquid or slurry) or powder in the channel and the magnetic member located in the channel 4, the present inventors found that the magnetic pole direction of the magnetic member is designed to be parallel to the flow direction of the channel (the direction indicated by the dotted arrow in the channel 4 in fig. 1), so that the magnetic force direction applied to the magnetic impurities at any position of the channel is substantially the same as the direction of the shortest path from the magnetic impurities to the surface of the magnetic member, and the magnetic impurities substantially reach the outside of the magnetic member along the shortest path under the action of the magnetic force.

Drawings

FIG. 1 is a schematic axial sectional view of a pipe for removing magnetic impurities according to an embodiment of the present invention;

FIG. 2 is a schematic axial sectional view of another pipe for removing magnetic impurities according to an embodiment of the present invention;

FIG. 3 is a schematic structural diagram of an arrangement of magnetic rods in a row when the magnetic member in FIGS. 1 and 2 is composed of a plurality of magnetic rods;

FIG. 4 is a schematic view showing the construction of a series connection of two piping units shown in FIG. 2;

FIG. 5 is a schematic diagram of another series connection of pipes provided in an embodiment of the present invention;

FIG. 6 is a schematic view of a plurality of the series arrangement of pipes shown in FIG. 5 connected in parallel with one another;

FIG. 7 is a schematic view of a piping structure used in Experimental example 1 of the present invention;

FIG. 8 is a schematic view showing the arrangement structure of magnets in Experimental example 5 of the present invention;

FIG. 9 is a schematic view showing an arrangement structure of magnets having different magnetic poles in experimental example 6 of the present invention;

fig. 10 is a schematic view of an arrangement structure of magnets having like poles facing each other in experimental example 7 of the present invention.

Reference numerals:

1: a pipe body; 2: an inlet; 3: an outlet; 4: a channel;

5: a magnetic member; 6: a tapered portion; 7: chamber, 8: a magnet; 9: and a pump body.

Detailed Description

The invention will be described in detail with reference to the specific drawings and examples, which are illustrative of the invention and are not to be construed as limiting the invention.

Referring to fig. 1, the present embodiment provides a pipeline for removing magnetic impurities, which mainly includes a pipeline main body 1, a channel 4 formed in the pipeline main body 1 and through which a fluid or a powder can flow, an inlet 2 and an outlet 3 are disposed on the pipeline main body 1, and the inlet 2 and the outlet 3 are respectively located at two ends of the channel 4 in the flowing direction and are used for the fluid or the powder to enter and exit.

A magnetic member 5 is arranged in the channel 4, and the magnetic pole direction of the magnetic member 5 is parallel to the flow direction of the channel 4.

As an illustration of this embodiment, a channel gap of the channel 4 is set according to the demagnetization effect and the flow rate requirement, and the magnetic member 5 with a proper thickness and a proper length is selected to make the magnetic field strength and the magnetic field gradient in the channel 4 meet the application requirement.

The roller body 1 of the present embodiment is made of non-magnetic material such as but not limited to stainless steel, or non-metallic plastic such as PE, PC, PVC, UPVC, or polyvinylidene fluoride containing fluorine, tetrafluoroethylene, etc.

As can be seen from the above, through the research on the background magnetic field formed by the flow field of the fluid (liquid or slurry) or powder in the channel 4 and the magnetic member 5 located in the channel 4, the inventors found that the magnetic pole direction of the magnetic member 5 is designed to be parallel to the flow direction of the channel 4 (the direction indicated by the dotted arrow in the channel 4 in fig. 1), so that the magnetic force direction applied to the magnetic impurities at any position of the channel 4 is substantially the same as (is not parallel to) the direction of the shortest path from the magnetic impurities to the surface of the magnetic member 5, and the magnetic impurities reach the outside of the magnetic member 5 along the shortest path under the action of the magnetic force.

In this embodiment, the magnetic member 5 is disposed at the center of the channel 4, so that when the fluid or powder flows through the channel 4 outside the magnetic member 5, the magnetic impurities in the fluid or powder are adsorbed on the periphery of the magnetic member 5, and after the use, the magnetic member 5 can be taken out to erase the magnetic impurities adsorbed on the magnetic member 5.

As an illustration of the present embodiment, the duct body 1 of the present embodiment may be further provided in a U shape as shown in fig. 2, in addition to being provided linearly as shown in fig. 1.

In this embodiment, it is also possible to provide a tapered portion 6 at a pole end of the magnetic member 5, the wider outer diameter end of the tapered portion 6 being connected to the pole end of the magnetic member 5 to which it is connected, the tapered portion 6 being tapered in outer diameter in a direction from the pole end of the magnetic member 5 to which it is connected to the end of the tapered portion 6. The conical part 6 is made of non-magnetic material, and a non-magnetic material or a cavity is arranged in the conical part 6. When the magnetic impurities adsorbed on the magnetic member 5 are cleaned, the magnetic impurities on the magnetic member 5 are smeared towards the conical part 6, when the magnetic impurities reach the conical part 6 along the magnetic member 5, since no magnetic conductive material is present in the tapered portion 6, the magnetic force applied to the magnetic impurities is reduced, and when the magnetic impurities reach the tapered portion 6, further advancing the magnetic impurities along the direction of narrowing the outer diameter of the tapered part 6, so that the magnetic impurities reach the end of the tapered part 6 along the tapered part 6, and as the magnetic impurities move to the end of the tapered part 6, its magnetic force that receives diminishes gradually, and magnetic impurities gathers together at the pointed end of toper portion 6, concentrates on this pointed end and comes out magnetic impurities's clearance, realizes the clearance of the magnetic impurities on the magnetic force piece 5, adopts setting up of this toper portion 6 to further be favorable to improving magnetic impurities's clearance convenience, reduces the degree of difficulty of clearance.

Referring to fig. 2, a chamber 7 not communicated with the channel 4 may be further disposed in the channel 4, the magnetic member 5 (or a package body in which the magnetic member 5 is packaged) is sealed in the chamber 7, when the fluid or powder flows in the channel 4, the fluid or powder does not directly contact with the magnetic member 5, and the magnetic impurities are adsorbed on the periphery of the chamber 7. When clearing up magnetic impurities, take out magnetic force piece 5 (or the packaging body that is packaged with magnetic force piece 5) from cavity 7, the magnetic force that acts on magnetic impurities on the outer wall of cavity 7 this moment disappears, then, adopt high pressure water washing passageway 4, can be clean the magnetic impurities who glues at the outer wall of cavity 7, along with high pressure water flows out, make magnetic impurities's clearance more convenient, more thorough, reduce the manpower physics of clearance, improve the work efficiency, specially adapted industrial application.

As an illustration of the present embodiment, the pipe body 1 of the present embodiment may be, but is not limited to, designed to be cylindrical or square-cylindrical, but is not limited to this, and may also be designed to be other shapes according to actual needs.

As an illustration of the present embodiment, the magnetic member 5 (or the package body in which the magnetic member 5 is packaged) of the present embodiment may be designed to be cylindrical or other cylindrical shape according to the shape of the pipe main body 1, so that the axial direction of the magnetic member 5 is the magnetic pole direction of the magnetic member 5.

Referring to fig. 1 and 2, the outer diameter of the magnetic member 5 (or the package body in which the magnetic member 5 is packaged) is smaller than the inner diameter of the pipe body 1, and the shape may be, but is not limited to, designed to be substantially identical to the pipe body 1, and the axial direction (the magnetic pole direction is identical to the axial direction) of the pipe body is parallel to or identical to the axial center of the channel 4, and is placed in the channel 4 of the pipe body 1.

In this embodiment, the cross section of the channel 4 may be designed to be circular, or the shape of the cross section of the channel 4 and the channel gap of the channel 4 may be designed according to the flow rate requirement of the fluid or the powder, so as to meet the flow rate and energy beat requirements of the fluid or the powder, and meet the demagnetization requirement.

Referring to fig. 3, the magnetic member 5 disposed in the package body according to the present embodiment may be composed of a plurality of discrete magnets 8, each of the magnets 8 is sequentially arranged in a row along the flow direction of the channel 4, the magnetic pole direction of each of the magnets 8 is parallel to the flow direction along the arrangement direction of the magnets 8, the magnetic poles (the magnetic poles refer to N pole and S pole in fig. 3) of any two adjacent magnets 8 are opposite, and the opposite magnetic poles of two adjacent magnets 8 are the same magnetic pole. The aligned magnets 8 are packaged in a package such that the individual magnets 8 are packaged together as an integral magnetic member 7 for ease of cleaning, operational maintenance, and assembly.

For the technical scheme who adopts a whole longer magnet 8, adopt this embodiment technical scheme, except being favorable to save material cost, still be favorable to strengthening everywhere magnetic field intensity in passageway 4, improve by the outer wall of passageway 4 to the magnetic field gradient reinforcing trend of 5 outer wall directions of magnetic force spare, further improve the adsorption effect to the magnetic impurities that flow through.

As an illustration of the present embodiment, each magnet 8 of the present embodiment is a cylindrical magnet 8, and each cylindrical magnet 8 is assembled on a package to form a long cylindrical whole (as shown by the magnetic member 7 in fig. 1 and 2 as a whole).

As an illustration of the present embodiment, in the application, the magnetic field intensity and the magnetic field gradient which satisfy the requirement of the magnetic impurities adsorption are calculated according to the particle size of the magnetic impurities of the object to be processed, and then the passage gap of the passage 4 is further calculated so that the passage 4 formed outside the magnetic member 5 is the axisymmetric passage 4, the passage gap of the passage 4 is Δ T, and the inner diameter of the pipe body 1 is set to be the same as the inner diameter of the pipe body 1

An inner diameter of

The magnetic field strength and the magnetic field gradient at the outermost position of the channel 4 are within predetermined ranges of the magnetic field strength and the magnetic field gradient.

Materials to be subjected to magnetic impurity removal treatment (such as but not limited to lithium ion battery anode ternary materials and raw materials thereof, and semi-finished products thereof in the production process) are injected from an inlet 2 of a channel 4, the materials flow from the channel 4, magnetic impurities in the materials are adsorbed into the channel 4 by a magnetic member 5 in the flow process in the channel 4, fluid or powder with the magnetic impurities removed flows out at an outlet 3, and the content of the magnetic impurities in the materials is reduced.

In specific implementation, the pipeline for removing magnetic impurities shown in fig. 1 and 2 in this embodiment may be set to be a shorter pipeline unit, and in application, according to the current requirement for removing magnetic impurities, a plurality of pipeline units are connected in series to form a longer pipeline, so as to increase the length of the demagnetizing channel and thus increase the demagnetizing effect, and the schematic diagram of the series connection is shown in fig. 4.

Referring to fig. 5, the serial structure shown in fig. 4 may be further configured to connect more pipelines in series, and the pump bodies 9 are respectively disposed at the inlet 2 and the outlet 3 of the overall pipeline to provide power for the fluid or powder in the channel 4, so as to control the flow rate of the fluid or powder.

Referring to fig. 6, a plurality of pipeline units connected in series may be connected in parallel to form a compact three-dimensional pipeline stacking structure, so as to improve material processing efficiency and improve productivity.

Referring to fig. 1 to 6, in order to facilitate the serial-parallel connection of the pipes, it is preferable to arrange the inlet 2 and the outlet 3 of each pipe body 1 on a side (which may be on the same side or different sides) perpendicular to the flow direction of the channel 4, so that each pipe body 1 connected in series or in parallel is arranged in a winding manner, which is beneficial to saving the floor space. However, the present invention is not limited to this, and the inlet 2 and the outlet 3 of the duct body 1 may be provided at opposite ends in the extending direction.

As an illustration of the present embodiment, the present inventors further studied the flow velocity of the channel 4 provided with the magnetic member 5 of the present embodiment, and found that the flow velocity balance in the channel 4 is greatly affected by providing the magnetic member 5 in the channel 4. Therefore, the inventor finds that on the premise that the channel gaps at the positions of the channel 4 are the same, the inlet 2 and the outlet 3 of the channel 4 are arranged on the same side of the channel 4, so that the uniformity of the flow velocity of fluid or powder in the channel 4 is improved, the adsorption uniformity of magnetic impurities is improved, and the demagnetization effect is improved.

As an illustration of the present embodiment, in the present embodiment, the channel gaps at various positions in the channel 4 may be set to be different, so as to control the flow velocity of the fluid or the powder through the channel gaps of the channel 4, so as to improve the flow velocity balance at various positions in the channel 4, and improve the demagnetization effect.

In this embodiment, the pipe body 1, the package, and the chamber 7 of this embodiment are made of non-magnetic materials, and specifically, the materials are selected to be corrosion-resistant, high temperature-resistant, and wear-resistant according to the fluid or powder to be processed.

The effect of the technical solution of the present embodiment is further illustrated by the following comparative experimental examples:

experimental example 1:

the pipe structure for removing magnetic impurities of this experimental example is shown in fig. 1 as follows:

the pipeline main body 1 is cylindrical and made of stainless steel, the inner diameter of the pipeline main body is 37mm, the length of the pipeline main body is 800mm, and an inlet 2 and an outlet 3 are respectively arranged at two opposite ends of the flow direction of the pipeline main body 1 so as to allow fluid or powder to enter and exit.

A cylindrical cavity 7 is arranged in the pipeline main body 1, the cavity 7 is made of stainless steel, the outer diameter of the cavity is 31mm, the length of the cavity is 800mm, the cavity 7 and the pipeline main body 1 are coaxially arranged in the pipeline main body 1, the channel gap of a channel 4 between the pipeline main body 1 and the cylindrical cavity 7 is 6mm, and the inner diameter of the cavity 7 is 25 mm.

Be provided with a solid columniform magnetic force spare 5 in cavity 7, this experimental example chooses permanent magnetism spare for use as magnetic force spare 5, specifically is Ru iron boron, and the diameter of magnetic force spare 5 is 25mm, and the magnetic pole of magnetic force spare 5 is located its axial both ends, and when placing magnetic force spare 5 in cavity 7, the magnetic pole direction of magnetic force spare 5 is unanimous with cylindrical cavity 7's axial, and is unanimous with the axial (the flow direction promptly) of pipeline main part 1 simultaneously.

Experimental example 2:

the pipe body 1 and the passage 4 of this example are the same as those of example 1.

The experimental example differs from experimental example 1 mainly in that:

the magnetic member 5 in the cylindrical chamber 7 of this experimental example is composed of 10 identical solid cylinders of magnets 8 made of ru-fe-b, the diameter of each magnet 8 is 25mm, and the length of each magnet 8 in the axial direction is 40 mm.

Referring to fig. 3, in the present experimental example, the magnetic pole direction of each magnet 8 coincides with the axial direction of the chamber 7 and the axial direction of the pipe body 1, and the magnets 8 are arranged in a row in the axial direction of the chamber 7, in which the like magnetic poles of the magnets 8 are opposed to each other, and the gap between two magnets 8 which are not adjacent to each other is 40 mm.

Experimental example 3:

the pipe body 1, the passage 4, the material of each magnet 8, the diameter of the magnet 8, the arrangement direction of the magnets 8, and the gap between any two adjacent magnets 8 in this example are the same as those in example 2.

The experimental example is different from the experimental example 2 mainly in that:

the length of the single magnet 8 in the axial direction is shorter, the length of the single magnet 8 in the axial direction is 24.3mm, and the number of the magnets 8 arranged in a line in the axial direction is 13.

Experimental example 4:

the pipe body 1, the passage 4, the material of each magnet 8, the diameter of each magnet 8, the axial length of each magnet 8, the arrangement direction of each magnet 8, and the gap between any two adjacent magnets 8 in this experimental example are the same as those in experimental example 3.

The experimental example is different from the experimental example 3 mainly in that:

in the present experimental example, the inlet 2 and the outlet 3 provided on the pipe main body 1 are co-located on the same side of the passage 4.

Experimental example 5:

the pipe body 1, the material of each magnet 8, the diameter of each magnet 8, the axial length of each magnet 8, and the gap between any two adjacent magnets 8 in this experimental example are the same as those in experimental example 4.

The experimental example is different from the experimental example 4 mainly in that:

the chamber 7 of this example was rectangular in shape, the length of the chamber 7 in the flow direction of the channel 4 was 800mm, the cross section of the chamber 7 perpendicular to the flow direction was rectangular, the width of the rectangle was 25mm, and the height was 24.3 mm.

Referring to fig. 8, the arrangement structure of each magnet 8 in the chamber 7 in this embodiment is different from that in embodiment 4, in this experimental example, the magnetic pole directions (N pole and S pole in the figure) of each magnet 8 are parallel to each other, the magnetic pole direction of each magnet 8 is perpendicular to the flow direction (indicated by the dotted arrow in the figure), the same magnetic pole of each magnet 8 is located on one side of the chamber 7, and the distance between any two adjacent magnets 8 is 40 mm.

Brief description of experimental procedures for demagnetization:

slurry of lithium ion battery grade lithium carbonate precipitation reaction is used as an experimental raw material.

The following pre-treatments were performed prior to the experiment:

step 1: preparing 100 liters of lithium carbonate slurry with the solid content of 10 percent, repeatedly stirring the slurry by using a 12000 gauss rubidium iron boron magnetic rod, timely cleaning magnetic impurities attached to the magnetic rod, continuously stirring after cleaning until no new magnetic substance is adsorbed on the magnetic rod, and keeping the treated lithium carbonate slurry for later use;

step 2: and (3) rubbing 350-mesh sand paper on stainless steel to obtain stainless steel scrap iron for later use, weighing 500mg of the stainless steel scrap iron by using an analytical balance with the precision of 0.1mg, mixing the stainless steel scrap iron into prepared lithium carbonate slurry, and preparing the slurry with the magnetic impurity content of 500PPB for later use.

Step 3: the prepared lithium carbonate slurry in Step2 was divided into 10 portions of 10 liters each, and as an experimental sample, theoretically, the slurry of 10 liters each contained 50mg of magnetic impurities.

The experimental operation of this experimental example is as follows:

experimental treatment of samples: and (3) treating the lithium carbonate slurry by the pretreatment Step 3.

Experimental equipment:

pipes for removing magnetic impurities shown in experimental examples 1 to 5;

the inlets 2 of the pipelines for removing the magnetic impurities are respectively connected with a funnel-shaped box body with the same shape and height, the height of the box body is 0.45m, and the capacity of the box body is at least more than 10 liters;

analytical balance, precision 0.1 mg;

demagnetization effect experiment:

1. taking 5 parts of each experimental sample, respectively placing the experimental samples into funnel-shaped boxes connected with pipelines for removing magnetic impurities, respectively enabling the slurry in each funnel-shaped box to flow into the pipelines of each experimental example from the boxes, controlling the flow velocity of the slurry in each channel 4 to be basically consistent, and controlling the flow velocity to be about 3 m/s without limitation, wherein all the slurry flows out from an outlet 3 of each channel 4.

2. After all the slurry flows out from the outlet 3 of the passage 4, taking out the chamber 7 provided with the magnetic member from the passage 4, and washing away the lithium carbonate powder attached outside the chamber 7 by using clear water;

it should be noted that, in the experimental examples, the chamber is designed to be a detachable structure for facilitating collection and weighing of the adsorbed magnetic impurities, but the experimental examples are not limited to this, and the chamber may also be designed to be a fixed non-detachable structure, and the purpose of cleaning the magnetic impurities can be achieved by cleaning the channel with the high-pressure cleaning liquid when the experimental examples are applied.

3. Taking out the magnetic member 4 (a strip magnet in the experimental example 1, and a whole magnetic member composed of a plurality of magnets and packaged on a packaging body in the experimental examples 2-5) in the chamber 7, at this time, the magnetic field on the chamber 7 disappears, the magnetic impurities originally adsorbed outside the chamber 7 under the action of magnetic force fall off, respectively collecting the magnetic impurities outside each chamber 7, drying each collected magnetic impurity, respectively weighing the weight of each collected magnetic impurity by using an analytical balance, and thus obtaining two removed magnetic impurities of each experimental example pipeline, wherein theoretically, the total content of the magnetic impurities of each 10 liters of experimental sample slurry is 50mg, and the ratio of the actually-called removed amount of the magnetic impurities to the total content of the magnetic impurities is the magnetic removal efficiency of the experimental example pipeline.

After the magnetic impurities on the magnetic piece are thoroughly cleaned after each experiment is finished, the experiment is repeated once.

The two experiments are respectively marked as the first time and the second time to obtain a comparison table of the magnetic impurity adsorption efficiency shown in the following table:

comparison table for magnetic impurity adsorption efficiency

As can be seen from the above table, compared with experimental example 1, the magnetic rods used in the pipelines of experimental examples 2 to 4 have less total mass, but because the magnetic rods are formed by arranging a plurality of discrete magnets 8 at intervals, the demagnetizing efficiency is more stable, the deironing effect is more reliable, and the demagnetizing efficiency is higher.

Compared with the pipeline of the experimental example 2, the axial length of each magnetic rod adopted in the experimental examples 3 and 4 is shorter, the total mass of the magnet is less, but the number of the adopted magnets 8 is more, so that the magnetic field gradient of the background magnetic field formed in the channel 4 is more, the demagnetization efficiency is more stable, the iron removal effect is more reliable, and the demagnetization efficiency is higher.

The axial length of the magnets 8 in the experimental examples 3, 4 and 5 is the same, the total mass is the same, the number is the same, and the distance between the magnets 8 is the same, but because the magnetic pole direction of each magnet 8 in the experimental examples 3 and 4 is different from that in the experimental example 5, the technical scheme that the magnetic pole direction of the experimental examples 3 and 4 is parallel to the flow direction of the channel is adopted, the demagnetization efficiency is more stable, the deferrization effect is more reliable, and the demagnetization efficiency is higher.

Background magnetic field range test experiment:

two identical cylindrical solid magnets 8 with the diameter of 25mm and the length of 24.3 are adopted, and the magnetic pole direction of the magnets 8 is consistent with the axial direction of the magnets 8.

Test example 6: referring to fig. 9, the synonym poles of the two magnets 8 are oppositely arranged, the gap between the oppositely arranged pole ends is 2.7mm, a KANETEC gauss meter TM-801EXP is adopted to measure the magnetic field at the center line position between the two magnets 8, and the distance from the farthest position a where the magnetic field strength is attenuated to 6000 gauss at the center line position to the surface of the magnetic rod 8 is detected to be 1.5 mm;

test example 7: referring to fig. 10, the same-name poles of the two magnets 8 are faced to each other, the gap between the facing pole ends is 2.7mm, the magnetic field at the center line position between the two magnets 8 is measured by using KANETEC gauss TM-801EXP, the farthest position where the magnetic field strength at the center line position is attenuated to 6000 gauss is detected to be 2.8mm away from the surface of the magnet 8, which is 1.3mm away from the distance of test example 1, and the magnetic field range is expanded by 86.67%. Therefore, the technical scheme that the like magnetic poles are opposite is adopted, the magnetic field range around the magnetic piece is favorably expanded, and the magnetic field intensity is improved.

The above-described embodiments do not limit the scope of the present invention. Any modification, equivalent replacement, and improvement made within the spirit and principle of the above-described embodiments should be included in the protection scope of the technical solution.

Claims

1. A pipeline for removing magnetic impurities is characterized by comprising a pipeline main body, wherein a channel through which fluid or powder can flow is formed in the pipeline main body, a magnetic member is sealed in the channel, and the magnetic pole direction of the magnetic member is parallel to the flow direction of the channel.

2. The pipe for removing magnetic impurities as claimed in claim 1,

the magnetic member includes:

a package body made of a non-magnetic conductive material;

3. The pipe for removing magnetic impurities as claimed in claim 1,

at least one end of the two ends of the packaging body in the arrangement direction of the magnets is also provided with: and a tapered part which is made of non-magnetic material and gradually becomes narrower in outer diameter towards the tail end direction, and the tapered part is empty or is made of non-magnetic material.

4. The pipe for removing magnetic impurities as claimed in claim 2,

the magnets are arranged in a row in sequence along the flow direction of the channel,

5. the pipe for removing magnetic impurities as claimed in claim 2,

each magnet is solid and cylindrical, and the axial direction of each magnet is parallel to the flow direction of the channel.

6. The pipe for removing magnetic impurities according to claim 5,

the axial length of the magnet is 24.3mm, and the cross section of the magnet perpendicular to the axial direction is a circle with the diameter of 24 mm.

7. The pipe for removing magnetic impurities according to claim 5,

the direction of the magnetic field gradient within the channel intersects the flow direction of the channel.

8. The pipe for removing magnetic impurities as claimed in claim 2,

the magnet is a permanent magnet.

9. The pipe for removing magnetic impurities as claimed in claim 1,

at least one end of the two ends of the magnetic member along the flow direction of the channel is further provided with: and a tapered part which is made of non-magnetic material and gradually becomes narrower in outer diameter towards the tail end direction, and the tapered part is empty or is made of non-magnetic material.