CN114700165A - Screening method for obtaining complete spherical plasma spheroidized powder - Google Patents
Screening method for obtaining complete spherical plasma spheroidized powder Download PDFInfo
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- CN114700165A CN114700165A CN202210317670.0A CN202210317670A CN114700165A CN 114700165 A CN114700165 A CN 114700165A CN 202210317670 A CN202210317670 A CN 202210317670A CN 114700165 A CN114700165 A CN 114700165A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03B—SEPARATING SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS
- B03B5/00—Washing granular, powdered or lumpy materials; Wet separating
- B03B5/28—Washing granular, powdered or lumpy materials; Wet separating by sink-float separation
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Abstract
The invention relates to the technical field of powder screening, and provides a screening method for obtaining complete spherical plasma spheroidized powder, which comprises the following steps: mixing plasma spheroidized powder to be screened, a thickening agent and water to obtain a mixed solution; then, carrying out ultrasonic post-separation on the obtained mixed solution to obtain a precipitate; finally repeating the operation for n times on the obtained precipitate to obtain complete spherical plasma spheroidized powder; wherein n is more than or equal to 0. According to the invention, the thickening agent is added into the mixed solution, so that the viscosity of the mixed solution is improved; along with the increase of the viscosity of the mixed solution, the sedimentation speed of the broken powder in the plasma spheroidized powder is greatly reduced compared with that of the complete spherical powder, so that the broken powder is suspended in the mixed solution, and the complete spherical powder is settled to the bottom of the mixed solution, thereby obtaining the complete spherical plasma spheroidized powder.
Description
Technical Field
The invention relates to the technical field of powder screening, in particular to a screening method for obtaining complete spherical plasma spheroidized powder.
Background
Plasma spheroidization is a good way for preparing spherical powder with uniform components, high sphericity and good fluidity, and the technical principle is as follows: the powder is sent into the high-temperature plasma by using the high-temperature environment of the thermal plasma and the carrier gas, the powder particles are rapidly heated and then surface (or whole) melted, and condensed into spherical liquid drops under the action of surface tension, and the spherical liquid drops are condensed and solidified after entering a cooling chamber, so that the spherical powder is obtained. However, the plasma spheroidized powder obtained contains broken powder, which affects the service performance of the finally obtained powder.
In the prior art, a method of sieving is usually adopted to remove broken powder, but non-spherical powder with a grain diameter slightly larger than a sieve hole still remains in complete spherical plasma spheroidized powder, so that the effect of removing broken powder with larger grain diameter is not ideal.
Therefore, it is desirable to provide a sieving method capable of obtaining a completely spherical plasma spheroidized powder.
Disclosure of Invention
In view of this, the present invention provides a screening method for obtaining a complete spherical plasma spheroidized powder, and the preparation method provided by the present invention can sufficiently remove broken powder in the plasma spheroidized powder, so as to obtain the complete spherical plasma spheroidized powder.
In order to achieve the above purpose, the invention provides the following technical scheme:
the invention provides a screening method for obtaining complete spherical plasma spheroidized powder, which comprises the following steps:
(1) mixing plasma spheroidized powder to be screened, a thickening agent and water to obtain a mixed solution;
(2) carrying out ultrasonic post-separation on the mixed solution obtained in the step (1) to obtain a precipitate;
(3) repeating the operation of the steps (1) and (2) for n times on the precipitate obtained in the step (2) to obtain complete spherical plasma spheroidized powder; wherein n is more than or equal to 0.
Preferably, the thickener in step (1) comprises at least one of starch, pectin, agar, methyl cellulose and carboxymethyl cellulose.
Preferably, the thickening agent is starch.
Preferably, the volume ratio of the water to the plasma spheroidized powder in the step (1) is (4-8): 1.
preferably, the mass ratio of the thickening agent to the plasma spheroidized powder in the step (1) is (0.5-3): 1.
preferably, the temperature of the ultrasound in the step (2) is 20-35 ℃.
Preferably, the frequency of the ultrasound in the step (2) is (20-45) KHZ.
Preferably, the time of the ultrasound in the step (2) is 5-25 min.
Preferably, the mixing solution is stirred while the ultrasound in the step (2) is performed.
Preferably, the time of the stirring and the time of the ultrasound are the same.
The invention provides a screening method for obtaining complete spherical plasma spheroidized powder, which comprises the following steps: mixing plasma spheroidized powder to be screened, a thickening agent and water to obtain a mixed solution; then, carrying out ultrasonic treatment on the obtained mixed solution and separating to obtain a precipitate; finally repeating the operation for n times on the obtained precipitate to obtain complete spherical plasma spheroidized powder; wherein n is more than or equal to 0. According to the invention, the thickening agent is added into the mixed solution to improve the viscosity of the mixed solution, and along with the increase of the viscosity of the mixed solution, the settling speed of the broken powder in the plasma spheroidized powder is greatly reduced compared with that of the complete spherical powder, so that the broken powder is suspended in the mixed solution, and the complete spherical powder is settled to the bottom of the mixed solution, thereby obtaining the complete spherical plasma spheroidized powder.
Detailed Description
The invention provides a screening method for obtaining complete spherical plasma spheroidized powder, which comprises the following steps:
(1) mixing plasma spheroidized powder to be screened, a thickening agent and water to obtain a mixed solution;
(2) carrying out ultrasonic post-separation on the mixed solution obtained in the step (1) to obtain a precipitate;
(3) repeating the operation of the step (1) and the operation of the step (2) for n times on the precipitate obtained in the step (2) to obtain complete spherical plasma spheroidized powder; wherein n is more than or equal to 0.
The method mixes the plasma spheroidized powder to be screened, the thickening agent and water to obtain a mixed solution.
In the invention, the plasma spheroidized powder to be screened is preferably spheroidized powder collected after plasma spheroidization is finished. In the invention, the powder to be screened after plasma spheroidizing contains broken powder besides complete spherical powder, wherein the broken powder seriously influences the subsequent use of the plasma spheroidized powder and needs to be removed.
In the present invention, the thickener preferably includes at least one of starch, pectin, agar, methyl cellulose and carboxymethyl cellulose, and more preferably starch. According to the invention, the thickening agent is added into the mixed solution to improve the viscosity of the mixed solution, and along with the increase of the viscosity of the mixed solution, the sedimentation speed of the crushed powder in the plasma spheroidized powder is greatly reduced compared with that of the complete spherical powder, so that the crushed powder is suspended in the mixed solution, and the complete spherical powder is settled to the bottom of the mixed solution, thereby obtaining the complete spherical plasma spheroidized powder.
In the invention, the volume ratio of the water to the plasma spheroidized powder is preferably (4-8): 1, more preferably (5-7): 1. in the invention, the mass ratio of the thickening agent to the plasma spheroidized powder is preferably (0.5-3): 1, more preferably (1-2): 1. the invention controls the dosage of the water and the thickening agent in the range, the obtained mixed solution has proper viscosity, can fully realize the suspension of the broken powder in the plasma spheroidized powder, and is beneficial to the sedimentation of the complete spherical powder to the bottom of the mixed solution.
After the mixed solution is obtained, the invention preferably performs ultrasonic treatment on the mixed solution to obtain a suspension, and then separates the suspension to obtain a precipitate.
In the invention, the temperature of the ultrasonic wave is preferably 20-35 ℃, and more preferably 25 ℃; the frequency of the ultrasonic wave is preferably (20-45) KHZ, and more preferably (30-40) KHZ; the time of the ultrasonic treatment is preferably 5-25 min, and more preferably 10-20 min. The invention limits the ultrasonic parameters in the range, and is beneficial to the full separation of the broken powder and the complete spherical powder in the plasma spheroidized powder.
In the present invention, the ultrasound is preferably performed while the mixed system is stirred. In the present invention, the stirring time is preferably the same as the ultrasonic time. The stirring operation is not particularly specified in the present invention, and the solution system is stirred by a stirring manner well known to those skilled in the art. The invention can accelerate the separation of broken powder and complete spherical powder in plasma spheroidized powder in the mixed solution by simultaneously matching and stirring the mixed solution through ultrasound.
The operation of the separation is not particularly specified in the invention, and the suspended substances in the suspension are removed by adopting a separation mode well known to a person skilled in the art, and then the water in the suspension is poured off to obtain a precipitate.
After the precipitate is obtained, the preparation of the mixed solution and the operation of the ultrasonic treatment in the scheme are repeated for n times, so that a crude product of the complete spherical plasma spheroidized powder is obtained, wherein n is more than or equal to 0, and preferably n is 3. In the present invention, after the preparation of the mixed solution and the operation of the ultrasonic treatment are completed once, if the obtained precipitate contains the crushed powder, the preparation of the mixed solution and the operation of the ultrasonic treatment are repeated until the precipitate contains no crushed powder.
After the crude product of the complete spherical plasma spheroidized powder is obtained, the invention preferably washes and dries the crude product to obtain the complete spherical plasma spheroidized powder.
The washing reagent is not specially specified in the invention, and the thickening agent on the obtained complete spherical plasma spheroidized powder can be removed by adopting a reagent well known by the technical personnel in the field. In embodiments of the invention, the washing agent is preferably ethanol. The invention takes the organic solvent ethanol with relatively low price as the detergent, not only can remove the starch on the complete spherical plasma spheroidized powder, but also can quickly and completely dry the obtained complete spherical plasma spheroidized powder easily because the boiling point of the ethanol is relatively low.
The drying method is not particularly limited in the present invention, and the solvent on the washed product can be removed by a drying method well known to those skilled in the art.
According to the invention, the thickening agent is added into the mixed solution to improve the viscosity of the mixed solution, and along with the increase of the viscosity of the mixed solution, the settling speed of the broken powder in the plasma spheroidized powder is greatly reduced compared with that of the complete spherical powder, so that the broken powder is suspended in the mixed solution, and the complete spherical powder is settled to the bottom of the mixed solution, thereby obtaining the complete spherical plasma spheroidized powder.
The technical solution of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
(1) Adding 500g of powder collected after the completion of the plasma spheroidization to be screened into a 1L beaker, adding deionized water 7 times the volume of the powder into the beaker, and adding 500g of starch into the beaker to obtain a mixed solution.
(2) And (2) putting the mixed solution obtained in the step (1) into an ultrasonic cleaning machine, setting the water temperature in the ultrasonic cleaning machine to be 25 ℃, the ultrasonic frequency to be 40KHZ, and carrying out ultrasonic treatment for 10min, wherein the mixed solution is stirred simultaneously to obtain a suspension.
(3) Scooping suspended matters in the suspension obtained in the step (2) by using water, and pouring water in the container to expose powder settled at the bottom of the container;
repeating the steps (1) to (3) for three times, and washing the powder which is deposited at the bottom of the container by using absolute ethyl alcohol to obtain a precipitate.
(4) And (4) sealing the precipitate obtained in the step (3) by using tinfoil, and drying in a constant-temperature oven at 80 ℃ for 24 hours to obtain complete spherical plasma spheroidized powder.
As can be seen from example 1, the thickening agent starch is added into the mixed solution, and the broken powder is fully removed in the form of suspended matters, so that the complete spherical plasma spheroidized powder is finally obtained.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (10)
1. A screening method for obtaining complete spherical plasma spheroidized powder comprises the following steps:
(1) mixing plasma spheroidized powder to be screened, a thickening agent and water to obtain a mixed solution;
(2) carrying out ultrasonic post-separation on the mixed solution obtained in the step (1) to obtain a precipitate;
(3) repeating the operation of the step (1) and the operation of the step (2) for n times on the precipitate obtained in the step (2) to obtain complete spherical plasma spheroidized powder; wherein n is more than or equal to 0.
2. A screening method according to claim 1, wherein said thickener in step (1) comprises at least one of starch, pectin, agar, methyl cellulose and carboxymethyl cellulose.
3. A screening method according to claim 2, wherein said thickening agent is starch.
4. A screening method according to claim 1, wherein the volume ratio of the water to the plasma spheroidized powder in the step (1) is (4-8): 1.
5. a screening method according to claim 1, wherein the mass ratio of the thickening agent to the plasma spheroidized powder in the step (1) is (0.5-3): 1.
6. a screening method according to claim 1, wherein the temperature of the ultrasound in step (2) is 20 to 35 ℃.
7. A screening method according to claim 1, wherein the frequency of the ultrasound in step (2) is (20-45) KHZ.
8. A screening method according to claim 1, 6 or 7, wherein the ultrasound in step (2) is for a period of 5-25 min.
9. A screening method according to claim 1, wherein the mixing solution is stirred while the ultrasound in step (2) is performed.
10. A method according to claim 9, wherein the time of agitation and the time of sonication are the same.
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| CN202210317670.0A CN114700165A (en) | 2022-03-29 | 2022-03-29 | Screening method for obtaining complete spherical plasma spheroidized powder |
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| CN202210317670.0A CN114700165A (en) | 2022-03-29 | 2022-03-29 | Screening method for obtaining complete spherical plasma spheroidized powder |
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| CN101838136A (en) * | 2010-05-14 | 2010-09-22 | 上海大豪纳米材料喷涂有限公司 | Preparation method of aluminium oxide and titanium dioxide compound ceramic powder |
| CN104087890A (en) * | 2014-07-18 | 2014-10-08 | 郑州高端装备与信息产业技术研究院有限公司 | Method for preparing ceramic coating lining of mud pump cylinder sleeve |
| CN204234313U (en) * | 2014-11-14 | 2015-04-01 | 北京科技大学 | A kind of disc type spherical powder screening plant |
| CN108993383A (en) * | 2018-07-16 | 2018-12-14 | 深圳市环球绿地新材料有限公司 | The preparation of spherical activated charcoal and screening technique |
| KR20210028984A (en) * | 2019-09-05 | 2021-03-15 | 한국표준과학연구원 | Raman-active Particle for Surface Enhanced Raman Scattering and the Fabrication Method Thereof |
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2022
- 2022-03-29 CN CN202210317670.0A patent/CN114700165A/en active Pending
Patent Citations (5)
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| CN101838136A (en) * | 2010-05-14 | 2010-09-22 | 上海大豪纳米材料喷涂有限公司 | Preparation method of aluminium oxide and titanium dioxide compound ceramic powder |
| CN104087890A (en) * | 2014-07-18 | 2014-10-08 | 郑州高端装备与信息产业技术研究院有限公司 | Method for preparing ceramic coating lining of mud pump cylinder sleeve |
| CN204234313U (en) * | 2014-11-14 | 2015-04-01 | 北京科技大学 | A kind of disc type spherical powder screening plant |
| CN108993383A (en) * | 2018-07-16 | 2018-12-14 | 深圳市环球绿地新材料有限公司 | The preparation of spherical activated charcoal and screening technique |
| KR20210028984A (en) * | 2019-09-05 | 2021-03-15 | 한국표준과학연구원 | Raman-active Particle for Surface Enhanced Raman Scattering and the Fabrication Method Thereof |
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