Ultrafine conductive nickel powder impurity separation equipment

Abstract

The present invention relates to the technical field of separation and purification of conductive powders, and specifically to an ultrafine conductive nickel powder impurity separation device. The present invention comprises a barrel-shaped body, on which a feed assembly, a centrifugal separation assembly, an electromagnetic adsorption plate, a material collection assembly and a bottom air impact assembly are arranged in sequence from top to bottom. After the nickel powder material enters the device, it is transported to the centrifugal separation assembly through the feed assembly. The centrifugal separation assembly cooperates with the bottom air impact assembly to produce a centrifugal effect on the material, and transports the material to the electromagnetic adsorption plate together with the airflow. The electromagnetic adsorption plate adsorbs the magnetic nickel powder, and the excess impurities are separated, thereby improving the purity of the nickel powder.

Description

Technical Field

[0001] The invention relates to the technical field of separation and purification of conductive powders, in particular to an ultrafine conductive nickel powder impurity separation device. Background Art

[0002] Conductive nickel powder is a functional conductive filler. It can be added to coatings, adhesives, inks, plastics, and rubbers to make conductive, electromagnetic shielding, and antistatic products. It is widely used in the fields of conductivity, electromagnetic shielding, and antistatic in various industrial sectors such as electronics, electromechanics, communications, printing, aerospace, and weapons. For example, it can be used for electromagnetic shielding and antistatic in electronic, electrical, and communication products such as computers, mobile phones, electronic medical equipment, and electronic instruments.

[0003] Ultrafine conductive nickel powder generally refers to nickel powder with a particle size between 0.08-0.8μm. Ultrafine nickel powder has a high specific surface area and excellent electrochemical properties. It is widely used as a positive electrode material for batteries, such as nickel-cadmium batteries, nickel-hydrogen batteries and lithium-ion batteries. In these batteries, ultrafine nickel powder can provide high-capacity energy storage and has excellent cycle performance and stability, thereby improving the overall performance of the battery.

[0004] Commonly used methods for preparing ultrafine conductive nickel powder include pressurized hydrogen reduction, chemical plating, electrodeposition, etc. The purity of ultrafine conductive nickel powder prepared by various methods is different. For example, a method for preparing dendritic ultrafine nickel powder disclosed in Chinese patent publication number CN1817526A is as follows: a mixed gas composed of carbonyl nickel vapor and carbon monoxide gas is introduced from the upper part of a decomposer, and the internal pressure of the decomposer is controlled to be 10-20 KPa. Six different temperature zones are formed from top to bottom in the decomposer, wherein the temperature of the first and second sections is 300-335°C, the temperature of the third and fourth sections is 320-360°C, and the temperature of the fifth and sixth sections is 300-330°C;

[0005] The carbonyl nickel vapor in the mixed gas enters the decomposer and is introduced into the upper part when it is heated. The carbonyl nickel is thermally decomposed during its falling process to form a dendritic ultrafine nickel powder with a particle size of 0.2 to 6 μm. The method of the present invention utilizes the thermal decomposition principle of carbonyl nickel, controls the process parameters of the decomposer to form high-purity nickel metal particles after the carbonyl nickel is decomposed, and connects the particles together in a dendritic shape during the growth process, and finally obtains an ultrafine dendritic nickel metal powder with a particle size range of 0.2 to 6 μm.

[0006] However, the ultrafine nickel powder produced by this preparation method contains more impurities, including carbon, oxide particles, aluminum and other granular impurities. Generally, the impurity content of the newly prepared ultrafine nickel powder is between 2% and 8%. These impurities greatly affect the performance of the ultrafine nickel powder. Therefore, it is necessary to separate the impurities and purify the ultrafine nickel powder before use.

[0007] In order to solve the above problems, the present invention provides an ultrafine conductive nickel powder impurity separation device. Summary of the invention

[0008] The object of the present invention is to provide an ultrafine conductive nickel powder impurity separation device to solve the problems raised in the above background technology.

[0009] In order to solve the above technical problems, the present invention provides the following technical solutions: an ultra-fine conductive nickel powder impurity separation device, comprising a barrel-shaped body, the body is provided with

[0010] A feed assembly, including a plurality of gas feed pipes extending into the body, for blowing nickel powder material into the body using gas;

[0011] The centrifugal separation component is arranged in the machine body and uses a rotating centrifugal method to blow the nickel powder material outward;

[0012] The electromagnetic adsorption plates are arranged in a plurality of equidistant circles around the center line of the machine body, and generate magnetic force when the electromagnetic adsorption plates are energized;

[0013] The material collection component is divided into a nickel powder collection part and an impurity collection part. The nickel powder collection part is located below the electromagnetic adsorption plate; the impurity collection part is located at the outer edge of the bottom of the body, surrounding the nickel powder collection part;

[0014] The bottom air flushing component is arranged on the bottom surface of the machine body and comprises a plurality of air flushing pipes arranged toward the centrifugal separation component and used for flushing the nickel powder material outside the centrifugal separation component.

[0015] More optimally, the centrifugal separation assembly includes a multi-blade rotor disposed at the center of the machine body, which is driven to rotate by a motor to blow the nickel powder material dispersed in the machine body to the surroundings in a centrifugal manner.

[0016] More optimally, the blades of the multi-blade rotor are arranged to be inclined relative to the vertical direction, and the inclination angle of the blades is 20 to 40 degrees.

[0017] More optimally, the gas feed pipe and the air flushing pipe are both inclined toward the centrifugal separation component, and the air flows blown out of the gas feed pipe and the air flushing pipe meet outside the centrifugal separation component.

[0018] More optimally, the feed assembly includes an outer shell on the top of the machine body, an agitator located at the center of the outer shell, and an air inlet connected to the side of the outer shell; the gas feed pipe is located at the bottom of the outer shell.

[0019] More optimally, a collecting piece for collecting nickel powder material is provided in the body, and the collecting piece includes a scraper, which is located between two electromagnetic adsorption plates, and the two sides of the scraper are in contact with the sides of the electromagnetic adsorption plates; a plurality of scrapers are provided around the center line of the body and are fixed on a movable ring provided outside the centrifugal separation assembly.

[0020] More optimally, the movable ring is driven to rise and fall by a cylinder arranged in the machine body.

[0021] More optimally, the spacing between two adjacent electromagnetic adsorption plates decreases from inside to outside, the cross section of the electromagnetic adsorption plate is a triangle, and the spacing between the two electromagnetic adsorption plates is 0.2 to 5 mm.

[0022] More optimally, the scraper is forked to the electromagnetic adsorption plates on both sides to form two triangular structure bonding plates, and the two bonding plates are respectively bonded to two adjacent electromagnetic adsorption plates.

[0023] More optimally, the impurity collecting part and the nickel powder collecting part are both annular structures with bottom openings, and nano-sieves are clamped in the nickel powder collecting part and the impurity collecting part, and the pore size of the nano-sieve is less than 80 nm.

[0024] Compared with the prior art, the beneficial effects achieved by the present invention are:

[0025] (1) In the present invention, after the airflow carrying the nickel powder material enters the middle position of the machine body, the motor drives the multi-blade rotor to rotate. Under the high-speed rotation of the multi-blade rotor, the nickel powder material can generate centrifugal force, and the nickel powder material is evenly thrown out and blown in all directions of the side by the centrifugal force. The blades of the multi-blade rotor are tilted relative to the vertical direction, which can control the direction and generate higher centrifugal force at the same rotation speed. In addition, a certain upward airflow can be generated to prevent the nickel powder material from falling and accumulating on the bottom surface of the machine body.

[0026] (2) In the present invention, after the electromagnetic adsorption plates are energized to generate magnetic force, the nickel powder is blown to the surroundings. When passing through the gaps between the electromagnetic adsorption plates, it is adsorbed by the magnetic force of the electromagnetic adsorption plates and thus adheres to the electromagnetic adsorption plates. Excess dust, carbon powder, aluminum and other impurities continue to be blown out by the wind or continue to float outward under the action of centrifugal force, thereby achieving separation of nickel powder and impurities.

[0027] (3) In the present invention, the air flushing pipe introduces airflow from bottom to top into the machine body, which is counteracted by the airflow and powder from top to bottom in the gas feed pipe. On the one hand, an airflow blowing in all directions can be formed, and on the other hand, the nickel powder material can be blown up to ensure that the nickel powder material is evenly distributed in the machine body, and then transported outward by the centrifugal force formed by the multi-blade rotor, thereby preventing the nickel powder material from falling too quickly and being deposited on the bottom surface of the machine body.

[0028] (4) In the present invention, after the nickel powder material enters, it is transported to the centrifugal separation component through the feeding component. The centrifugal separation component cooperates with the bottom air impulse component to produce a centrifugal effect on the material, and transports the material to the electromagnetic adsorption plate together with the air flow. The electromagnetic adsorption plate adsorbs the magnetic nickel powder and separates the excess impurities, thereby improving the purity of the nickel powder. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0030] Figure 1 This is the overall structure diagram of Example 1;

[0031] Figure 2 It is an explosion diagram of Example 1;

[0032] Figure 3 is a structural diagram of the centrifugal separation assembly in Example 1;

[0033] Figure 4 is a structural diagram of the electromagnetic adsorption plate in Example 1;

[0034] Figure 5 This is the structural diagram of the scraper.

[0035] Among them, 1. body; 11. gas feed pipe; 12. air inlet; 2. centrifugal separation component; 21. multi-blade rotor; 3. electromagnetic adsorption plate; 4. material collection component; 41. nickel powder collection part; 42. impurity collection part; 5. air flushing pipe; 6. outer shell; 7. agitator; 8. scraper. DETAILED DESCRIPTION

[0036] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0037] The present invention provides an ultra-fine conductive nickel powder impurity separation device, such as Figures 1 to 5 As shown, it includes a barrel-shaped body 1, on which a feed assembly, a centrifugal separation assembly 2, an electromagnetic adsorption plate 3, a material collection assembly 4 and a bottom air impact assembly are arranged from top to bottom. After the nickel powder material enters, it is transported to the centrifugal separation assembly 2 through the feed assembly. The centrifugal separation assembly 2 cooperates with the bottom air impact assembly to produce a centrifugal effect on the material, and transports the material to the electromagnetic adsorption plate 3 together with the airflow. The electromagnetic adsorption plate 3 adsorbs the magnetic nickel powder, and the excess impurities are separated, thereby improving the purity of the nickel powder.

[0038] Among them, the feeding assembly includes an outer shell 6 on the top of the body 1, an agitator 7 arranged at the center position of the outer shell 6, and also includes a plurality of gas feed pipes 11 extending into the body 1 and an air inlet 12 connected to the side of the outer shell 6, which are used to use gas to blow nickel powder material into the body 1. The gas feed pipe 11 is located at the bottom of the outer shell 6.

[0039] After the nickel powder material is fed into the space inside the shell 6 from the inlet at the top of the shell 6, the inlet of the material is closed, and the nickel powder is stirred and broken up under the action of the stirrer 7. At the same time, the air inlet 12 blows gas into the space. The nickel powder material is evenly dispersed in the space under the action of the airflow, and enters the centrifugal separation component 2 in the middle position of the body 1 through the gas feed pipe 11 along with the airflow.

[0040] The centrifugal separation component 2 is arranged in the body 1, and uses a rotating centrifugal method to blow the nickel powder material outward; the centrifugal separation component 2 includes a multi-blade rotor 21 arranged in the center of the body 1, which is driven to rotate by a motor to blow the nickel powder material scattered in the body 1 to the surroundings in a centrifugal manner; the blades of the multi-blade rotor 21 are inclined relative to the vertical direction, and the inclination angle of the blades is 20 to 40 degrees.

[0041] After the airflow carrying the nickel powder material enters the middle position of the body 1, the motor drives the multi-blade rotor 21 to rotate. Under the high-speed rotation of the multi-blade rotor 21, the nickel powder material can generate centrifugal force, and the nickel powder material is evenly thrown and blown in all directions of the side by the centrifugal force. The blades of the multi-blade rotor 21 are tilted relative to the vertical direction, which can control the direction and generate higher centrifugal force at the same speed. In addition, a certain upward airflow can also be generated to prevent the nickel powder material from falling and accumulating on the bottom surface of the body 1.

[0042] The nickel powder material is blown to the surroundings by centrifugal action and enters the area of ​​the electromagnetic adsorption plate 3. There are several electromagnetic adsorption plates 3 distributed equidistantly around the center line of the machine body 1. The electromagnetic adsorption plates 3 generate magnetic force after being energized; the spacing between two adjacent electromagnetic adsorption plates 3 decreases from the inside to the outside, the cross section of the electromagnetic adsorption plate 3 is a triangle, and the spacing between the two electromagnetic adsorption plates 3 is 0.2 to 5 mm.

[0043] After the electromagnetic adsorption plate 3 is powered on to generate magnetic force, the nickel powder is blown to the surroundings. When passing through the gap between the electromagnetic adsorption plates 3, it will be adsorbed by the magnetic force of the electromagnetic adsorption plates 3, and thus adhere to the electromagnetic adsorption plates 3, while the excess dust, carbon powder, aluminum and other impurities continue to be blown out by the wind, or continue to float outward under the action of centrifugal force, so as to achieve the separation of nickel powder and impurities. The cross section of the electromagnetic adsorption plate 3 is a triangle, and the sharp corner of the triangle faces the center of the body 1, in order to ensure that the impurities can smoothly pass through the gap between the electromagnetic adsorption plates 3 and prevent the impurities from being hindered when they float outward; and the spacing between the two electromagnetic adsorption plates 3 is controlled to ensure that the nickel powder can be attracted by the magnetic force and adsorbed on the electromagnetic adsorption plate 3.

[0044] In order to make the nickel powder material more evenly distributed in the center of the machine body 1 and increase the floating time of the nickel powder material, a bottom air-blasting assembly is further provided in the machine body 1, which is arranged on the bottom surface of the machine body 1 and includes a plurality of air-blasting pipes 5 arranged toward the centrifugal separation assembly 2, and is used to scatter the nickel powder material outside the centrifugal separation assembly 2. The gas feed pipe 11 and the air-blasting pipe 5 are both inclined toward the centrifugal separation assembly 2, and the airflow blown out of the gas feed pipe 11 and the air-blasting pipe 5 meets outside the centrifugal separation assembly 2.

[0045] During operation, the air flushing pipe 5 introduces airflow from bottom to top into the machine body 1, which impacts with the airflow and powder from top to bottom in the gas feed pipe 11. On the one hand, it can form an airflow blowing in all directions, and on the other hand, it can also blow up the nickel powder material to ensure that the nickel powder material is evenly distributed in the machine body 1, and then transported outward by the centrifugal force formed by the multi-blade rotor 21, preventing the nickel powder material from falling too quickly and depositing on the bottom surface of the machine body 1.

[0046] The bottom of the body 1 is a material collecting assembly 4, which is divided into a nickel powder collecting part 41 and an impurity collecting part 42. The nickel powder collecting part 41 is located below the electromagnetic adsorption plate 3; the impurity collecting part 42 is located at the outer edge of the bottom of the body 1, surrounding the nickel powder collecting part 41; in addition, a collecting part for collecting nickel powder materials is also provided in the body 1, and the collecting part includes a scraper 8, and the scraper 8 is located between the two electromagnetic adsorption plates 3, and the two sides of the scraper 8 are in contact with the side surfaces of the electromagnetic adsorption plates 3; a plurality of scrapers 8 are provided around the center line of the body 1, and are fixed on a movable ring provided outside the centrifugal separation assembly 2, and the movable ring is driven to rise and fall by a cylinder provided in the body 1.

[0047] The scraper 8 forks toward the electromagnetic adsorption plates 3 on both sides to form two triangular structure bonding plates, and the two bonding plates are respectively bonded to the two adjacent electromagnetic adsorption plates 3. The impurity collection part 42 and the nickel powder collection part 41 are both annular structures with bottom openings, and nano-sieves are clamped in the nickel powder collection part 41 and the impurity collection part 42, and the aperture of the nano-sieve is less than 80nm.

[0048] After the blowing and separation of the nickel powder material is completed, the nickel powder material and impurities need to be collected. At this time, the electromagnetic adsorption plate 3 is de-energized. After the magnetic force disappears, most of the nickel powder will directly fall into the nickel powder collection part 41 at the bottom. A small part of the nickel powder is still adhered to the electromagnetic adsorption plate 3. At this time, the cylinder needs to be started to drive the movable ring and the scraper 8 to move downward. The scraper 8 scrapes the nickel powder from the electromagnetic adsorption plate 3 and drops it into the nickel powder collection part 41 at the bottom to collect the nickel powder. The setting of the two bonding plates can make it easier for the scraper 8 to scrape off the nickel powder, and can also prevent the nickel powder from adhering to the scraper 8.

[0049] The impurities fly directly out of the electromagnetic adsorption plate 3 under the action of airflow and centrifugal force, and fall into the outermost impurity collection part 42, thereby achieving the separation of nickel powder and impurities. Since the present invention uses ultrafine nickel powder, the particle size of the ultrafine nickel powder is between 0.08 and 0.8 microns, so the use of a nano sieve can keep the ultrafine nickel powder on the sieve, and the airflow can pass smoothly, avoiding the generation of a large air pressure in the body 1.

[0050] The purity of the ultrafine nickel powder after screening by the present invention can reach more than 99.92%, far exceeding other physical separation equipment currently on the market.

[0051] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0052] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An ultrafine conductive nickel powder impurity separation device, comprising a barrel-shaped body (1), characterized in that: The machine body (1) is provided with A feed assembly, comprising a plurality of gas feed pipes (11) extending into the machine body (1) and used for blowing nickel powder material into the machine body (1) using gas; A centrifugal separation component (2) is disposed in the machine body (1) and uses a rotating centrifugal method to blow the nickel powder material outward; A plurality of electromagnetic adsorption plates (3) are equidistantly distributed around the center line of the machine body (1), and the electromagnetic adsorption plates (3) generate magnetic force when energized; The material collecting assembly (4) is divided into a nickel powder collecting portion (41) and an impurity collecting portion (42), wherein the nickel powder collecting portion (41) is located below the electromagnetic adsorption plate (3); and the impurity collecting portion (42) is located at the outer edge of the bottom of the body (1) and surrounds the nickel powder collecting portion (41). A bottom air flushing assembly, arranged on the bottom surface of the machine body (1), comprising a plurality of air flushing pipes (5) arranged toward the centrifugal separation assembly (2) and used for flushing away nickel powder material outside the centrifugal separation assembly (2); The centrifugal separation component (2) comprises a multi-blade rotor (21) disposed at the center of the machine body (1), which is driven to rotate by a motor and blows the nickel powder material dispersed in the machine body (1) to the surroundings in a centrifugal manner; The gas feed pipe (11) and the gas flushing pipe (5) are both inclined toward the centrifugal separation component (2), and the gas flows blown out of the gas feed pipe (11) and the gas flushing pipe (5) meet outside the centrifugal separation component (2); The feed assembly comprises a shell (6) at the top of the machine body (1), a stirrer (7) arranged at the center of the shell (6), and an air inlet (12) connected to the side of the shell (6); the gas feed pipe (11) is located at the bottom of the shell (6); A collecting member for collecting nickel powder material is provided in the machine body (1), the collecting member comprising a scraper (8), the scraper (8) being located between the two electromagnetic adsorption plates (3), and the two sides of the scraper (8) being in contact with the side surfaces of the electromagnetic adsorption plates (3); a plurality of scrapers (8) are provided around the center line of the machine body (1), and are fixed on a movable ring provided outside the centrifugal separation assembly (2).

2. The ultrafine conductive nickel powder impurity separation device according to claim 1, characterized in that: The blades of the multi-blade rotor (21) are arranged to be inclined relative to the vertical direction, and the inclination angle of the blades is 20 to 40 degrees.

3. The ultrafine conductive nickel powder impurity separation device according to claim 1, characterized in that: The movable ring is driven to rise and fall by a cylinder arranged in the machine body (1).

4. The ultrafine conductive nickel powder impurity separation device according to claim 1, characterized in that: The spacing between two adjacent electromagnetic adsorption plates (3) decreases from the inside to the outside, the cross section of the electromagnetic adsorption plate (3) is triangular, and the spacing between the two electromagnetic adsorption plates (3) is 0.2 to 5 mm.

5. The ultrafine conductive nickel powder impurity separation device according to claim 4, characterized in that: The scraper (8) forks toward the electromagnetic adsorption plates (3) on both sides to form two triangular structure bonding plates, and the two bonding plates are respectively bonded to two adjacent electromagnetic adsorption plates (3).

6. The ultrafine conductive nickel powder impurity separation device according to claim 1, characterized in that: The impurity collecting portion (42) and the nickel powder collecting portion (41) are both annular structures with an opening at the bottom, and nano-sieves are clamped and arranged inside the nickel powder collecting portion (41) and the impurity collecting portion (42), wherein the pore size of the nano-sieve is less than 80 nm.

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