CN112642697A - Method for screening micro-nano powder - Google Patents

Method for screening micro-nano powder Download PDF

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Publication number
CN112642697A
CN112642697A CN202011313240.9A CN202011313240A CN112642697A CN 112642697 A CN112642697 A CN 112642697A CN 202011313240 A CN202011313240 A CN 202011313240A CN 112642697 A CN112642697 A CN 112642697A
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Prior art keywords
powder
ultrasonic
screening
micro
metal
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Pending
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CN202011313240.9A
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Chinese (zh)
Inventor
崔巍
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Foshan Southern China Institute For New Materials
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Foshan Southern China Institute For New Materials
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Priority to CN202011313240.9A priority Critical patent/CN112642697A/en
Publication of CN112642697A publication Critical patent/CN112642697A/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
    • B07B1/00—Sieving, screening, sifting, or sorting solid materials using networks, gratings, grids, or the like
    • B07B1/28—Moving screens not otherwise provided for, e.g. swinging, reciprocating, rocking, tilting or wobbling screens
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
    • B07B1/00—Sieving, screening, sifting, or sorting solid materials using networks, gratings, grids, or the like
    • B07B1/46—Constructional details of screens in general; Cleaning or heating of screens
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
    • B07B2230/00—Specific aspects relating to the whole B07B subclass
    • B07B2230/01—Wet separation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
    • B07B2230/00—Specific aspects relating to the whole B07B subclass
    • B07B2230/04—The screen or the screened materials being subjected to ultrasonic vibration

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  • Combined Means For Separation Of Solids (AREA)
  • Separation Of Solids By Using Liquids Or Pneumatic Power (AREA)

Abstract

The invention discloses a method for screening micro-nano powder, which comprises the following steps: mixing the micro-nano powder with a solvent, and dispersing to form a suspension; adding the suspension into a separation device with a screen, wherein the aperture of the screen is micron-sized or nano-sized; and applying ultrasonic waves to the separation device, screening to obtain screened liquid, carrying out solid-liquid separation on the screened liquid, and drying the separated solid to obtain fine screening powder. The method of the invention utilizes the cavitation effect generated by ultrasonic waves in the liquid medium to enable the liquid carrying micro-nano powder to rapidly pass through the screen, thereby realizing the fine screening of micro-nano particles and the accurate control of D100, and avoiding the risk of dust pollution and even dust explosion in the screening process.

Description

Method for screening micro-nano powder
Technical Field
The invention relates to a method for screening micro-nano powder, in particular to a method for screening micro-nano powder.
Background
The particle size of the powder particles is normally distributed, and the particle size of the powder particles is not uniform. However, application fields such as heat-conducting composite materials and electric-conducting composite materials generally have higher requirements on inorganic fillers, and more strict requirements on the particle size of powder particles are provided in more high-end application fields, so that deep processing of micro-nano powder is particularly important. In the prior art, powder classification is realized by adopting sedimentation classification, specifically, small particle powder floats on the liquid surface of a solvent, medium particle powder suspends in the solution, then slowly descends after standing for a period of time, and large particle powder quickly sinks, so that a large particle split body is obtained, but the sedimentation classification is difficult to realize screening of medium particles and large particles, and the floating small particles are removed at most. The aperture of the existing commercial vibrating screen is 30 microns at least, and the classification of the vibrating screen cannot realize the screening of powder below 30 microns. The traditional airflow classification is difficult to achieve fine screening of particle sizes, the vibration screening of powder particles can only achieve screening of particles above 30 micrometers, and dust pollution and even dust explosion risks exist in the screening process.
Disclosure of Invention
The present invention is directed to solving at least one of the problems of the prior art. Therefore, the invention provides a method for screening micro-nano powder, which can effectively carry out fine screening on the micro-nano powder with the particle size of less than 30 microns, and the screened powder particles have more concentrated particle size distribution, so that the powder particles in a certain particle size range can be accurately obtained.
In a first aspect of the present invention, a method for sieving micro-nano powder is provided, which comprises the following steps:
mixing the micro-nano powder with a solvent, and dispersing to form a suspension;
adding the suspension into a separation device with a screen, wherein the aperture of the screen is micron-sized or nano-sized;
and applying ultrasonic waves to the separation device, screening to obtain screened liquid, carrying out solid-liquid separation on the screened liquid, and drying the separated solid to obtain fine screening powder.
The method for screening the micro-nano powder provided by the embodiment of the invention at least has the following beneficial effects:
the embodiment of the invention provides a method for screening micro-nano powder, which utilizes cavitation effect generated by ultrasonic waves in a liquid medium to enable liquid carrying the micro-nano powder to rapidly pass through a screen, realizes fine screening of micro-nano particles and accurate control of D100, and has no risk of dust pollution or even dust explosion in the screening process.
According to the method for screening the micro-nano powder, provided by the invention, the aperture of the screen is 0.5-30 μm.
According to the method for screening the micro-nano powder, provided by the invention, the solid-liquid separation mode is vacuum filtration.
According to the method for screening the micro-nano powder, the drying mode is heating at 80-150 ℃.
According to the method for screening the micro-nano powder, the solvent is water, ethanol, cyclohexane,
According to the method for screening the micro-nano powder, 0.5% -1.0% of sodium hexametaphosphate is added into the solvent to improve the dispersion effect of water or ethanol.
According to the method for screening the micro-nano powder, the micro-nano powder comprises at least one of metal oxide powder, metal nitride powder, metal carbide powder, metal hydroxide powder and metal powder.
According to the method for screening the micro-nano powder, disclosed by the invention, the metal oxide powder comprises at least one of aluminum oxide, zinc oxide, silicon dioxide, zirconium oxide, titanium oxide, magnesium oxide and beryllium oxide; the metal nitride powder comprises at least one of silicon nitride, boron nitride and aluminum nitride; the metal carbide powder comprises at least one of silicon carbide and boron carbide; the metal hydroxide powder comprises at least one of aluminum hydroxide and magnesium hydroxide; the metal powder comprises at least one of aluminum powder, silver powder, copper powder, gold powder and alloy powder.
According to the method for screening the micro-nano powder, the separation device comprises an ultrasonic separation device, and the ultrasonic separation device comprises:
a metal screen cylinder having a sidewall and the screen, the screen being located at a bottom of the metal screen cylinder;
an ultrasonic generating component to apply ultrasonic waves to the metal screen cylinder.
According to the method for screening micro-nano powder provided by some embodiments of the invention, the ultrasonic generation part comprises:
an ultrasonic transmission member connected to the side wall;
and the ultrasonic generator is connected with the ultrasonic transmission component and is used for transmitting ultrasonic waves to the metal screen cylinder through the ultrasonic transmission component.
According to the method for screening the micro-nano powder, the ultrasonic transmission part comprises an ultrasonic transmission rod and an ultrasonic transmission surrounding piece, and the ultrasonic transmission surrounding piece extends from the ultrasonic transmission rod and surrounds the side wall.
According to the method for screening the micro-nano powder, provided by some embodiments of the invention, the ultrasonic transmission part is an ultrasonic transmission rod, and the ultrasonic generator is directly connected with the side wall through the ultrasonic transmission rod.
Drawings
The invention is further described with reference to the following figures and examples, in which:
FIG. 1 is an electron microscope image of powder particles before sieving with 15 μm spheroidal alumina according to example D50 of the present invention and a finely sieved powder obtained by sieving with the method of the present invention;
FIG. 2 is an electron microscope morphology of powder particles before sieving with spherical alumina of 5 μm D50 and finely sieved powder obtained after sieving with the method of the present invention;
FIG. 3 is an electron microscope morphology of powder particles before sieving with spherical alumina of 3 μm D50 and the finely sieved powder obtained after sieving with the method of the present invention;
FIG. 4 is a separating apparatus for use in accordance with an embodiment of the present invention;
FIG. 5 is another separation device used in an embodiment of the present invention.
Reference numerals:
the ultrasonic separation device 1000, the metal screen cylinder 1100, the side wall 1110, the screen 1120, the ultrasonic generating part 1200, the ultrasonic transmitting part 1210, the ultrasonic transmitting rod 1211, the ultrasonic transmitting surrounding part 1212, the ultrasonic generator 1220, the fixed bracket 2000 and the base 3000.
Detailed Description
The concept and technical effects of the present invention will be clearly and completely described below in conjunction with the embodiments to fully understand the objects, features and effects of the present invention. It is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments, and those skilled in the art can obtain other embodiments without inventive effort based on the embodiments of the present invention, and all embodiments are within the protection scope of the present invention.
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.
In the description of the present invention, it should be understood that the orientation or positional relationship referred to in the description of the orientation, such as the upper, lower, front, rear, left, right, etc., is based on the orientation or positional relationship shown in the drawings, and is only for convenience of description and simplification of description, and 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 thus, should not be construed as limiting the present invention.
In the description of the present invention, unless otherwise explicitly limited, terms such as arrangement, installation, connection and the like should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above terms in the present invention in combination with the specific contents of the technical solutions.
In the description of the present invention, reference to the description of the terms "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
Example 1
This example provides a spherical-like alumina fine sieving powder prepared according to the following steps:
(1) adding 50g D50-15 mu m spherical alumina into 300g of water, and dispersing for 1min by using an ultrasonic disperser to obtain a suspension;
(2) gradually adding the suspension obtained in the step (1) into a metal screen cylinder with the diameter of 10cm and the height of 10cm, wherein the aperture of a screen at the bottom of the metal screen cylinder is 20 microns, applying ultrasonic waves with the frequency of 20K and the power of 500W, and carrying out ultrasonic classification until the suspension completely passes through the screen and reaches a receiving container;
(3) carrying out vacuum filtration on the suspension obtained in the step (2) until only powder particles are left;
(4) and (4) putting the powder particles obtained in the step (3) into an oven, and heating for 30min at 100 ℃ to obtain the fine screening powder.
Example 2
The embodiment provides a spherical alumina fine screening powder, which is prepared according to the following steps:
(1) adding spherical alumina with the particle size of 50g D50-5 mu m into 300g of ethanol, and dispersing for 1min by using an ultrasonic disperser to obtain a suspension;
(2) gradually adding the suspension obtained in the step (1) into a metal screen cylinder with the diameter of 15cm and the height of 15cm, wherein the aperture of a screen at the bottom of the metal screen cylinder is 10 microns, applying ultrasonic waves with the frequency of 20K and the power of 500W, and carrying out ultrasonic classification until the suspension completely passes through the screen and reaches a receiving container;
(3) carrying out vacuum filtration on the suspension obtained in the step (2) until only powder particles are left;
(4) and (4) putting the powder particles obtained in the step (3) into an oven, and heating for 30min at 80 ℃ to obtain the fine screening powder.
Example 3
This example provides a spherical-like alumina fine sieving powder prepared according to the following steps:
(1) adding 50g D50-3 mu m spherical alumina into 500g cyclohexane, and dispersing for 1min by using an ultrasonic disperser to obtain a suspension;
(2) gradually adding the suspension obtained in the step (1) into a metal screen cylinder with the diameter of 20cm and the height of 20cm, wherein the aperture of a screen at the bottom of the metal screen cylinder is 5 microns, applying ultrasonic waves with the frequency of 20K and the power of 500W, and carrying out ultrasonic classification until the suspension completely passes through the screen and reaches a receiving container;
(3) carrying out vacuum filtration on the suspension obtained in the step (2) until only powder particles are left;
(4) and (4) putting the powder particles obtained in the step (3) into an oven, and heating for 30min at 80 ℃ to obtain the fine screening powder.
Comparative examples
Comparative example 1
(1) Adding 50g D50-15 mu m spherical alumina into 300g of water, and dispersing for 1min by using an ultrasonic disperser to obtain a suspension;
(2) carrying out vacuum filtration on the suspension obtained in the step (1) until only powder particles are left;
(3) and (3) putting the powder particles obtained in the step (2) into an oven to be heated for 30min at 100 ℃.
Comparative example 2
(1) Adding spherical alumina of 50g D50-5 μm into 300g ethanol, and dispersing for 1min with ultrasonic disperser to obtain suspension;
(2) carrying out vacuum filtration on the suspension obtained in the step (1) until only powder particles are left;
(3) and (3) putting the powder particles obtained in the step (2) into an oven, and heating for 30min at 80 ℃.
Comparative example 3
(1) Adding 50g D50-3 mu m spherical alumina into 500g cyclohexane, and dispersing for 1min by using an ultrasonic disperser to obtain a suspension;
(2) carrying out vacuum filtration on the suspension obtained in the step (1) until only powder particles are left;
(3) and (3) putting the powder particles obtained in the step (2) into an oven, and heating for 30min at 80 ℃.
Fig. 1 is an electron microscope morphology of powder particles before sieving (comparative example 1, fig. 1 (a)) and finely sieved powder obtained after sieving by the method of the present invention (example 1, fig. 1 (b)) of D50 ═ 15 μm spheroidal alumina.
Fig. 2 is an electron micrograph of powder particles before sieving (comparative example 2, fig. 2 (a)) of spherical alumina having a particle size of 5 μm D50 and a finely sieved powder obtained after sieving by the method of the present invention (example 2, fig. 2 (b)).
Fig. 3 is an electron micrograph of powder particles before sieving (comparative example 3, fig. 3 (a)) of spherical alumina having a size of 3 μm D50 and a finely sieved powder obtained after sieving by the method of the present invention (example 3, fig. 3 (b)).
As can be seen from FIGS. 1-3, no powder particles larger than the screen mesh exist after the screening by the method of the present invention, the large particles affecting the powder performance are effectively removed, and the whole particle size is more uniform.
The following provides a separation device for implementing the screening method, so as to more clearly understand the process of finely screening the micro-nano powder.
Fig. 4 shows a separation device, which includes an ultrasonic separation device 1000, the ultrasonic separation device 1000 includes a metal screen cylinder 1100 and an ultrasonic generation component 1200, the metal screen cylinder 1100 includes a side wall 1110 and a screen 1120, the ultrasonic generation component 1200 is used for applying ultrasonic waves to the metal screen cylinder 1100, after a suspension to be screened is added to the metal screen cylinder 1100, a suspension composed of powder particles and a liquid medium can be subjected to particle size screening through the screen 1120 capable of accurately controlling the aperture, the size of the maximum particle size of the powder particles can be accurately controlled, and powder particles in a certain particle size range can also be subjected to secondary screening. It will be appreciated that in some embodiments, the screen 1120 is located at the lower end of the metal screen cylinder 1100 and wraps around the entire bottom, and the size of the passing particle can be controlled by controlling the size of the openings in the screen.
In some embodiments, the mesh 1120 in the metal screen cylinder 1100 has a pore size of 0.5 μm to 30 μm. By utilizing the dispersion effect and the carrier effect of the liquid medium and matching with the strong cavitation effect of the ultrasonic wave, the classification of powder particles with the particle size of less than 30 microns can be realized.
In some embodiments, the metal screen cylinder 1100 is a cylinder, and the metal screen cylinder 1100 has a diameter of 5-20 cm and a height of 5-20 cm.
It is understood that the ultrasonic generating part 1200 may include an ultrasonic wave transmitting part 1210 and an ultrasonic wave generator 1220, the ultrasonic wave transmitting part 1210 is connected to the sidewall 1110, and the ultrasonic wave generator 1220 is connected to the sidewall 1110 through the ultrasonic wave transmitting part 1210 to transmit the ultrasonic wave to the metallic sieve drum 1100.
In some embodiments, the ultrasound transmission member 1210 is an ultrasound transmission rod 1211, and the ultrasound generator 1220 is directly connected to the sidewall 1110 via the ultrasound transmission rod 1211 as shown in FIG. 1. The ultrasonic transmission rod 1211 may be embodied as an ultrasonic horn.
It is understood that the ultrasonic generating component may be an ultrasonic probe (the structure is not shown in the figure), and after the side wall 1110 and the screen 1120 are assembled, the ultrasonic probe is inserted into the metal screen cylinder 1100 to a position 0.5-2cm above the screen 1120, so that after the suspension is poured, the ultrasonic vibration is applied through the ultrasonic probe without externally vibrating the metal screen cylinder 1100.
It is understood that the fine screening apparatus may include a mounting bracket 2000 capable of fixedly supporting the ultrasonic separation apparatus 1000, and in some embodiments, the mounting bracket 2000 may have a circular ring portion, and the mounting bracket 2000 may be rigidly connected or non-rigidly connected to the metallic screen cylinder 1100 by being sleeved on the metallic screen cylinder 1100 in the ultrasonic separation apparatus 1000 for fixing purposes.
It will be appreciated that the screening device may also comprise a base 3000, by means of which the whole screening device is stabilized, the fixing support 2000 being in rigid contact connection with the base 3000, in order to prevent the problem of the ultrasonic vibrations being absorbed by the fixing support 2000, which would lead to a reduced capacity for ultrasonic classification.
It will be appreciated that the screening apparatus may further comprise a receiving container (not shown) which is positioned directly below the metal screen cylinder 1100 for receiving the material screened through the metal screen cylinder 1100 when the screening is performed.
Fig. 5 shows another separating device, the ultrasound generating unit 1200 may include an ultrasound transmitting unit 1210 and an ultrasound generator 1220, the ultrasound transmitting unit 1210 includes an ultrasound transmitting rod 1211 and an ultrasound transmitting surrounding element 1212, the ultrasound transmitting surrounding element 1212 extends from the right end of the ultrasound transmitting rod 1211 and surrounds the sidewall 1110, the ultrasound transmitting surrounding element 1212 is shown surrounding the sidewall 1110 for one circle, it can be understood that the ultrasound transmitting effect can still be achieved when the ultrasound transmitting surrounding element is not completely surrounded, and the protection scope of the present application also belongs to the present application. It will be appreciated that in some embodiments, the ultrasonic transmission rod 1211 is a metal rod, the ultrasonic transmission surrounding element 1212 is a metal ring, and the ultrasonic transmission rod 1211 and the ultrasonic transmission surrounding element 1212 are integrally formed to facilitate the transmission of the ultrasonic waves.

Claims (10)

1. A method for screening micro-nano powder is characterized by comprising the following steps:
mixing the micro-nano powder with a solvent, and dispersing to form a suspension;
adding the suspension into a separation device with a screen, wherein the aperture of the screen is micron-sized or nano-sized;
and applying ultrasonic waves to the separation device, screening to obtain screened liquid, carrying out solid-liquid separation on the screened liquid, and drying the separated solid to obtain fine screening powder.
2. The method for screening micro-nano powder according to claim 1, wherein the aperture of the screen is 0.5-30 μm.
3. The method for screening micro-nano powder according to claim 1, wherein the solid-liquid separation mode is vacuum filtration.
4. The method for screening micro-nano powder according to claim 1, wherein the drying is performed by heating at 80-150 ℃.
5. The method for screening micro-nano powder according to any one of claims 1 to 4, wherein the micro-nano powder comprises at least one of metal oxide powder, metal nitride powder, metal carbide powder, metal hydroxide powder and metal powder.
6. The method for screening micro-nano powder according to claim 5, wherein the metal oxide powder comprises at least one of alumina, zinc oxide, silica, zirconia, titania, magnesia and beryllia; the metal nitride powder comprises at least one of silicon nitride, boron nitride and aluminum nitride; the metal carbide powder comprises at least one of silicon carbide and boron carbide; the metal hydroxide powder comprises at least one of aluminum hydroxide and magnesium hydroxide; the metal powder comprises at least one of aluminum powder, silver powder, copper powder, gold powder and alloy powder.
7. The method for screening micro-nano powder according to any one of claims 1 to 4, wherein the separation device comprises an ultrasonic separation device, and the ultrasonic separation device comprises:
a metal screen cylinder having a sidewall and the screen, the screen being located at a bottom of the metal screen cylinder;
an ultrasonic generating component to apply ultrasonic waves to the metal screen cylinder.
8. The method for screening micro-nano powder according to claim 7, wherein the ultrasonic generating component comprises:
an ultrasonic transmission member connected to the side wall;
and the ultrasonic generator is connected with the ultrasonic transmission component and is used for transmitting ultrasonic waves to the metal screen cylinder through the ultrasonic transmission component.
9. The method for sieving micro-nano powder according to claim 8, wherein the ultrasonic transmission component comprises an ultrasonic transmission rod and an ultrasonic transmission surrounding member, and the ultrasonic transmission surrounding member extends from the ultrasonic transmission rod and surrounds the side wall.
10. The method for screening micro-nano powder according to claim 8, wherein the ultrasonic transmission component is an ultrasonic transmission rod, and the ultrasonic generator is directly connected with the side wall through the ultrasonic transmission rod.
CN202011313240.9A 2020-11-20 2020-11-20 Method for screening micro-nano powder Pending CN112642697A (en)

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Application publication date: 20210413