CN113056080A - Plasma arc vapor phase method production system for preparing nano powder - Google Patents
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- 239000011858 nanopowder Substances 0.000 title claims abstract description 62
- 238000000034 method Methods 0.000 title claims abstract description 34
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 27
- 239000012808 vapor phase Substances 0.000 title claims abstract description 24
- 239000004744 fabric Substances 0.000 claims abstract description 69
- 238000006243 chemical reaction Methods 0.000 claims abstract description 50
- 238000001816 cooling Methods 0.000 claims abstract description 41
- 239000007795 chemical reaction product Substances 0.000 claims abstract description 15
- 238000002360 preparation method Methods 0.000 claims abstract description 15
- 239000007787 solid Substances 0.000 claims abstract description 13
- 239000000463 material Substances 0.000 claims abstract description 6
- 239000007789 gas Substances 0.000 claims description 34
- 239000003507 refrigerant Substances 0.000 claims description 15
- 239000000843 powder Substances 0.000 claims description 13
- 239000002184 metal Substances 0.000 claims description 9
- 229910052751 metal Inorganic materials 0.000 claims description 9
- 229910044991 metal oxide Inorganic materials 0.000 claims description 9
- 150000004706 metal oxides Chemical class 0.000 claims description 9
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 8
- 239000001301 oxygen Substances 0.000 claims description 8
- 229910052760 oxygen Inorganic materials 0.000 claims description 8
- 239000000126 substance Substances 0.000 claims description 7
- 239000011261 inert gas Substances 0.000 claims description 6
- 230000007246 mechanism Effects 0.000 claims description 6
- 238000002485 combustion reaction Methods 0.000 claims description 5
- 238000009841 combustion method Methods 0.000 claims description 4
- 230000035484 reaction time Effects 0.000 claims description 4
- 238000003860 storage Methods 0.000 claims description 4
- 230000009471 action Effects 0.000 claims description 3
- 238000009434 installation Methods 0.000 claims description 3
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- 238000009792 diffusion process Methods 0.000 claims description 2
- 230000009467 reduction Effects 0.000 claims description 2
- 239000002245 particle Substances 0.000 abstract description 13
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- 238000005054 agglomeration Methods 0.000 abstract description 2
- 230000002776 aggregation Effects 0.000 abstract description 2
- 230000015572 biosynthetic process Effects 0.000 abstract description 2
- QPLDLSVMHZLSFG-UHFFFAOYSA-N Copper oxide Chemical compound [Cu]=O QPLDLSVMHZLSFG-UHFFFAOYSA-N 0.000 description 8
- 238000009826 distribution Methods 0.000 description 3
- 238000005265 energy consumption Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 238000007599 discharging Methods 0.000 description 2
- 230000035939 shock Effects 0.000 description 2
- 238000001308 synthesis method Methods 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 239000005751 Copper oxide Substances 0.000 description 1
- 238000002441 X-ray diffraction Methods 0.000 description 1
- 238000007792 addition Methods 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 238000010009 beating Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910000416 bismuth oxide Inorganic materials 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 229910000431 copper oxide Inorganic materials 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- TYIXMATWDRGMPF-UHFFFAOYSA-N dibismuth;oxygen(2-) Chemical compound [O-2].[O-2].[O-2].[Bi+3].[Bi+3] TYIXMATWDRGMPF-UHFFFAOYSA-N 0.000 description 1
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- 239000002086 nanomaterial Substances 0.000 description 1
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05H—PLASMA TECHNIQUE; PRODUCTION OF ACCELERATED ELECTRICALLY-CHARGED PARTICLES OR OF NEUTRONS; PRODUCTION OR ACCELERATION OF NEUTRAL MOLECULAR OR ATOMIC BEAMS
- H05H1/00—Generating plasma; Handling plasma
- H05H1/24—Generating plasma
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B82—NANOTECHNOLOGY
- B82Y—SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
- B82Y30/00—Nanotechnology for materials or surface science, e.g. nanocomposites
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B13/00—Oxygen; Ozone; Oxides or hydroxides in general
- C01B13/14—Methods for preparing oxides or hydroxides in general
- C01B13/20—Methods for preparing oxides or hydroxides in general by oxidation of elements in the gaseous state; by oxidation or hydrolysis of compounds in the gaseous state
- C01B13/22—Methods for preparing oxides or hydroxides in general by oxidation of elements in the gaseous state; by oxidation or hydrolysis of compounds in the gaseous state of halides or oxyhalides
- C01B13/28—Methods for preparing oxides or hydroxides in general by oxidation of elements in the gaseous state; by oxidation or hydrolysis of compounds in the gaseous state of halides or oxyhalides using a plasma or an electric discharge
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01G—COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
- C01G3/00—Compounds of copper
- C01G3/02—Oxides; Hydroxides
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2002/00—Crystal-structural characteristics
- C01P2002/70—Crystal-structural characteristics defined by measured X-ray, neutron or electron diffraction data
- C01P2002/72—Crystal-structural characteristics defined by measured X-ray, neutron or electron diffraction data by d-values or two theta-values, e.g. as X-ray diagram
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2004/00—Particle morphology
- C01P2004/01—Particle morphology depicted by an image
- C01P2004/03—Particle morphology depicted by an image obtained by SEM
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2004/00—Particle morphology
- C01P2004/60—Particles characterised by their size
- C01P2004/64—Nanometer sized, i.e. from 1-100 nanometer
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2006/00—Physical properties of inorganic compounds
- C01P2006/80—Compositional purity
Abstract
A plasma arc vapor phase method production system for preparing nano powder relates to the technical field of nano powder material preparation. The device comprises a feeder, a plasma arc reaction chamber, a cooling component, a cloth bag collecting component and the like. The material enters the plasma arc reaction chamber through the feeder and is combusted through the plasma arc flame flow to form gaseous reaction products. And cooling the gaseous reaction product by a cooling assembly to obtain airflow containing solid nano powder, and finally collecting the airflow through a cloth bag in a cloth bag collecting assembly. The nano powder product prepared by the invention has small particle size and no hard agglomeration, and particularly adopts the cooling component and the cloth bag collecting component, so that the temperature drop of high-temperature airflow can be realized, which has a crucial influence on the formation of low-particle-size nano powder.
Description
Technical Field
The invention relates to the technical field of nano powder material preparation, in particular to a plasma arc vapor phase method production system for preparing nano powder.
Background
The metal oxide powder has the advantages of high melting point, high hardness, high chemical stability and the like, and is widely applied to the industrial field. At present, a solidification synthesis method and a liquid phase synthesis method are mainly adopted for preparing metal oxide powder, but the methods generally have the defects of low product purity, uneven particle size distribution, long production time, high production energy consumption and the like.
The plasma arc flame combustion method is a novel preparation method which gradually receives attention in recent years, and has the advantages which are incomparable with the conventional preparation methods, such as short reaction time, high product purity, small particle size and the like. Chinese patent application CN 101628734 a discloses a method for producing bismuth oxide by plasma vapor phase method, which adopts plasma vapor phase method, uses plasma technology to make the temperature of the reaction furnace instantly rise to over 5000K, then cools it by gravity settling chamber, finally collects it by cloth bag dust collector. When the method is applied to the preparation of metal oxides such as copper oxide and the like, the temperature reduction rate is generally slow, so that particles which are up to 100 nanometers or less are re-aggregated, and finally the particle size of the prepared product is up to hundreds of nanometers. Therefore, how to rapidly cool and collect the powder is the key to prepare the powder with the particle size of less than 100 nanometers.
Disclosure of Invention
Aiming at the technical problems of the preparation of the copper oxide powder, the invention provides a plasma arc vapor phase method production system for preparing nano powder, which has the advantages of novel construction of a reaction system, simple and convenient operation and low energy consumption. The prepared nano powder has the advantages of high purity, uniform particle size distribution, particle size smaller than 100nm and the like.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows: a plasma arc vapor phase method production system for preparing nano powder mainly comprises a feeder, a plasma arc reaction chamber, a plasma power supply and a compressor, wherein the plasma power supply is started to enable a generator at the top of the plasma arc reaction chamber to start working to form plasma arc flame flow, materials enter the plasma arc reaction chamber through the feeder and form gaseous reaction products through the combustion of the plasma arc flame flow, and the compressor compresses gas required by the preparation of the nano powder and continuously inputs the gas into the plasma arc reaction chamber; the plasma arc vapor phase method production system for preparing the nano powder further comprises a cooling assembly and a cloth bag collecting assembly, wherein the bottom of the plasma arc reaction chamber is sequentially communicated with the cooling assembly and the cloth bag collecting assembly through pipelines, a gaseous reaction product is cooled through the cooling assembly to obtain an air flow containing the solid nano powder, the air flow is finally collected through a cloth bag in the cloth bag collecting assembly, and the air flow discharged by the cloth bag collecting assembly is converged into a compressor.
Further, the plasma arc vapor phase method production system for preparing the nano powder further comprises an air flow purification circulating system consisting of an air pump and a purifier, wherein the air pump is arranged between the cloth bag collecting assembly and the purifier, and the purifier is communicated with the air flow input end of the compressor; after the gas flow discharged by the cloth bag collecting assembly is purified by the purifier, the gas flow is stored and pressurized by the compressor and then is introduced into the top of the plasma arc reaction chamber again to form gas flow circulation.
Furthermore, a valve is arranged on an airflow pipeline between the purifier and the compressor for exhausting gas or inputting fresh gas required by the preparation of the nano powder.
Furthermore, the cooling assembly consists of an airflow pipe, a cooling jacket, a refrigerant circulating pipeline and an ice maker, and high-temperature airflow passing through the airflow pipe exchanges heat with a refrigerant in the cooling jacket outside the airflow pipe so as to realize cooling; the ice maker works to realize the circulating cooling of the refrigerant in the cooling jacket through a refrigerant circulating pipeline, and the flow direction of the refrigerant in the cooling jacket is opposite to the flow direction of high-temperature airflow passing through the airflow pipe.
Furthermore, a fan and an airflow diffusion opening are arranged at the top of the cloth bag collecting assembly, a plurality of cloth bags which are vertically arranged are arranged in the cloth bag collecting assembly, the bottom ends of the cloth bags are communicated with an airflow discharge pipe through a flexible connector, and the airflow discharge pipe is communicated with an air pump; the solid nano powder collected by the cloth bag collecting component is enriched at the outer side of the cloth bag, and the solid nano powder is collected in a storage box at the bottom of the cloth bag collecting component by a collecting mechanism.
Further, the collecting mechanism is composed of a connecting rod, a hanging chain, a knocking plate and a telescopic cylinder, the cloth bag is fixed on the connecting rod through the hanging chain, and the connecting rod is fixed at the top of the inner side of the cloth bag collecting assembly through the hanging chain to achieve installation of the cloth bag.
Further, with the striking board setting that telescopic cylinder is connected is in the outside of sack collection subassembly to realize rotating through the axle, striking board one side and stretching into the sack and collect the inside and be connected with connecting rod one end of subassembly, realize falling in the solid-state nanometer powder in the sack outside through telescopic cylinder work, and collect in the receiver.
As another object of the present invention, the technical solution adopted by the present invention is: a method for preparing nano powder by using the plasma arc vapor phase method production system comprises the following steps:
firstly, plasma arc flame combustion method reaction
Firstly, introducing inert gas or oxygen into a plasma arc reaction chamber through a compressor, starting a plasma power supply, and starting a generator at the top of the plasma arc reaction chamber to work to form plasma arc flame flow; then, conveying metal powder to the top end inside the plasma arc reaction chamber through a feeder, rapidly reacting through plasma arc flame flow, introducing inert gas for reaction to obtain metal simple substance nano powder, introducing oxygen for reaction to obtain metal oxide nano powder, and introducing a high-temperature gaseous reaction product into a cooling assembly from the bottom of the plasma arc reaction chamber;
the flame flow temperature at the top of the plasma arc reaction chamber is 600-6000 ℃, the reaction time is less than 1s, and the power of a plasma power supply is 30-120 kW and can be adjusted;
② collecting metal simple substance nano powder or metal oxide nano powder
Under the action of the cooling component, the high-temperature gaseous reaction product is rapidly cooled to obtain airflow containing solid nano powder, and finally, the airflow is collected through a cloth bag in the cloth bag collecting component;
thirdly, air current circulation
After the gas flow discharged by the cloth bag collecting assembly is purified by a purifier, the gas flow is stored and pressurized by a compressor and then is introduced into the top of the plasma arc reaction chamber again to form gas flow circulation; when the fresh inert gas or oxygen needs to be supplemented, the fresh gas is input from the valve.
Compared with the prior art, the invention has the beneficial effects that:
1) the method realizes the preparation of the high-purity nano powder, has the advantages of simple and convenient process, low cost, high product purity and the like, can be used for large-scale production, and can obviously reduce the reaction temperature and the production energy consumption.
2) The plasma arc flame combustion reaction system with novel design can realize the rapid preparation of high-purity nano powder, and the one-step method ionic arc combustion can rapidly synthesize the nano material with high purity and large powder specific surface area.
3) In a plasma arc flame combustion reaction system, the ion arc reaction is instantly finished and can reach millisecond level, the particle size of the prepared product is small, no hard agglomeration exists, particularly, a cooling assembly and a cloth bag collecting assembly are adopted, the temperature shock of high-temperature airflow can be realized, the temperature shock has important influence on the formation of low-particle-size nano powder, and the production system and the process method have positive guiding significance for the field of the preparation of metal simple substance nano powder or metal oxide nano powder.
Drawings
FIG. 1 is a schematic structural diagram of a plasma arc vapor phase process production system for preparing nano-powder.
Fig. 2 is a schematic structural view of the cooling module.
Fig. 3 is a schematic structural view of a cloth bag collecting assembly.
FIG. 4 is the XRD pattern of the nano-copper oxide powder prepared in example 2.
FIG. 5 is SEM images of the nano-copper oxide powder prepared in example 2 (a and b represent high and low magnification, respectively).
Detailed Description
The invention provides a plasma arc vapor phase method production system for preparing nano powder, and the method of the invention is further detailed by embodiments and figures.
Example 1
Referring to fig. 1, a plasma arc vapor phase method production system for preparing nano-powder comprises a feeder 1, a plasma arc reaction chamber 2, a plasma power supply 4, a cooling component 5, a cloth bag collecting component 6, an air pump 7, a purifier 8 and a compressor 9. The plasma power supply 4 is started to enable the generator 3 at the top of the plasma arc reaction chamber 2 to work to form plasma arc flame flow, and materials enter the plasma arc reaction chamber 2 through the feeder 1 and are combusted through the plasma arc flame flow to form gaseous reaction products. The bottom of the plasma arc reaction chamber 2 is sequentially communicated with a cooling component 5 and a cloth bag collecting component 6 through pipelines, a gaseous reaction product is cooled by the cooling component 5 to obtain an air flow containing solid nano powder, and finally the air flow is collected through a cloth bag in the cloth bag collecting component 6.
The air pump 7 and the purifier 8 jointly form an air flow purification circulating system, the air pump 7 is arranged between the cloth bag collecting assembly 6 and the purifier 8, and the purifier 8 is communicated with the air flow input end of the compressor 9; after the gas flow discharged by the cloth bag collecting assembly 6 is purified by the purifier 8, the gas flow is stored and pressurized by the compressor 9 and then is introduced into the top of the plasma arc reaction chamber 2 again to form gas flow circulation, and the compressor 9 compresses the gas required by the preparation of the nano powder and continuously inputs the gas into the plasma arc reaction chamber 2. A valve 10 is arranged on an airflow pipeline between the purifier 8 and the compressor 9 and is used for exhausting gas or inputting fresh gas required by preparing nano powder.
Referring to fig. 2, the cooling assembly 5 is composed of an airflow pipe 52, a cooling jacket 51, a refrigerant circulation pipeline 53, and an ice maker 54, wherein a high-temperature airflow passing through the airflow pipe 52 exchanges heat with a refrigerant in the cooling jacket 51 outside the airflow pipe to achieve cooling; the ice maker 54 works to realize the circulation cooling of the refrigerant in the cooling jacket 51 through the refrigerant circulation pipeline 53, and the flow direction of the refrigerant in the cooling jacket 51 is opposite to the flow direction of the high-temperature airflow passing through the airflow pipe 52.
Referring to fig. 3, a fan 61 and an airflow diffusing port 62 are disposed at the top of the cloth bag collecting assembly 6, a plurality of cloth bags 66 are disposed in the cloth bag collecting assembly 6, the bottom ends of the cloth bags 66 are communicated with an airflow discharging pipe 67 through a flexible connector 65, and the airflow discharging pipe 67 is communicated with the air pump 7; the solid nano powder collected by the cloth bag collecting component 6 is enriched at the outer side of the cloth bag 66, and the solid nano powder is collected in the storage box 68 at the bottom of the cloth bag collecting component 6 by the collecting mechanism.
The collecting mechanism is composed of a connecting rod 630, a hanging chain 64, a knocking plate 631 and a telescopic cylinder 632, the cloth bag 66 is fixed on the connecting rod 630 through the hanging chain 64, and the connecting rod 630 is fixed at the top of the inner side of the cloth bag collecting assembly 6 through the hanging chain to achieve installation of the cloth bag 66. The setting of beating the board 631 that is connected with telescopic cylinder 632 is in the outside that the subassembly 6 was collected to the sack to realize rotating through the axle, beat board 631 one side and stretch into the sack and collect the inside and be connected with connecting rod 630 one end of subassembly 6, work through telescopic cylinder 632 and realize the solid-state nanometer powder whereabouts that is attached to the sack 66 outside, and collect in receiver 68.
Example 2
Taking the preparation of the copper oxide nano powder as an example, the method for preparing by utilizing the plasma arc vapor phase method production system comprises the following steps:
firstly, plasma arc flame combustion method reaction
Firstly, introducing high-purity oxygen into a plasma arc reaction chamber 2 through a compressor 9, starting a plasma power supply 4, and starting a generator 3 at the top of the plasma arc reaction chamber 2 to work to form plasma arc flame flow; then, conveying copper powder to the top end inside the plasma arc reaction chamber 2 through the feeder 1, and enabling a high-temperature gaseous reaction product to enter the cooling assembly 5 from the bottom of the plasma arc reaction chamber 2 through rapid reaction of plasma arc flame flow;
the flame flow temperature at the top of the plasma arc reaction chamber 2 is 600-6000 ℃, the reaction time is less than 1s, and the power of the plasma power supply 4 is 30-120 kW and can be adjusted;
② collecting metal simple substance nano powder or metal oxide nano powder
Under the action of the cooling component 5, the high-temperature gaseous reaction product is rapidly cooled to obtain an air flow containing CuO nano powder, and finally, the air flow is collected through a cloth bag in the cloth bag collecting component 6;
thirdly, air current circulation
After the gas flow discharged by the cloth bag collecting assembly 6 is purified by a purifier 8, the gas flow is stored and pressurized by a compressor 9 and then is introduced into the top of the plasma arc reaction chamber 2 again to form gas flow circulation; when fresh oxygen needs to be replenished, fresh gas is fed from valve 10.
Fig. 4 is an XRD spectrum of the nano CuO powder prepared in example 2, and analysis shows that the reaction product is CuO.
Fig. 5 is an overall SEM morphology of the CuO nanopowder prepared in example 2 (a and b represent high and low magnifications, respectively), which shows that the particle size distribution of the powder particles is uniform, the average particle size is 30nm, no large particles exist, and the product is not aggregated. Through detection, the purity of the prepared nano CuO powder reaches over 99.99 percent.
The foregoing is merely exemplary and illustrative of the principles of the present invention and various modifications, additions and substitutions of the specific embodiments described herein may be made by those skilled in the art without departing from the principles of the present invention or exceeding the scope of the claims set forth herein.
Claims (8)
1. A plasma arc vapor phase method production system for preparing nano powder mainly comprises a feeder (1), a plasma arc reaction chamber (2), a plasma power supply (4) and a compressor (9), wherein the plasma power supply (4) is started to enable a generator (3) at the top of the plasma arc reaction chamber (2) to start working to form plasma arc flame flow, materials enter the plasma arc reaction chamber (2) through the feeder (1) and form gaseous reaction products through plasma arc flame flow combustion, and the compressor (9) compresses gas required by nano powder preparation and continuously inputs the gas into the plasma arc reaction chamber (2); it is characterized in that the preparation method is characterized in that,
the plasma arc vapor phase method production system for preparing the nano powder further comprises a cooling assembly (5) and a cloth bag collecting assembly (6), the bottom of the plasma arc reaction chamber (2) is sequentially communicated with the cooling assembly (5) and the cloth bag collecting assembly (6) through pipelines, gaseous reaction products are cooled through the cooling assembly (5) to obtain airflow containing solid nano powder, and finally the airflow is collected through a cloth bag in the cloth bag collecting assembly (6), and the airflow discharged by the cloth bag collecting assembly (6) converges into a compressor (9).
2. The plasma arc vapor phase method production system for preparing nano powder according to claim 1, further comprising a gas flow purification circulation system consisting of an air pump (7) and a purifier (8), wherein the air pump (7) is arranged between the cloth bag collecting component (6) and the purifier (8), and the purifier (8) is communicated with a gas flow input end of a compressor (9); the gas flow discharged by the cloth bag collecting assembly (6) is purified by a purifier (8), and then is stored and pressurized by a compressor (9) and then is introduced into the top of the plasma arc reaction chamber (2) again to form gas flow circulation.
3. The plasma arc vapor phase method production system for preparing nano powder according to claim 2, wherein a valve (10) is provided on a gas flow pipe between the purifier (8) and the compressor (9) for exhausting gas or inputting fresh gas required for preparing nano powder.
4. The plasma arc vapor phase method production system for preparing nano powder according to any one of claims 1 to 3, wherein the cooling assembly (5) is composed of an airflow pipe (52), a cooling jacket (51), a refrigerant circulating pipeline (53) and an ice maker (54), and high-temperature airflow passing through the airflow pipe (52) and a refrigerant in the cooling jacket (51) outside the airflow pipe are subjected to heat exchange to realize temperature reduction; the ice maker (54) works to realize the circulating cooling of the refrigerant in the cooling jacket (51) through the refrigerant circulating pipeline (53), and the flow direction of the refrigerant in the cooling jacket (51) is opposite to the flow direction of high-temperature airflow passing through the airflow pipe (52).
5. The plasma arc vapor phase method production system for preparing nano-powder according to claim 2 or 3, wherein a fan (61) and an air flow diffusion port (62) are arranged at the top of the cloth bag collecting assembly (6), a plurality of cloth bags (66) which are vertically arranged are arranged in the cloth bag collecting assembly (6), the bottom ends of the cloth bags (66) are communicated with an air flow discharge pipe (67) through a flexible connector (65), and the air flow discharge pipe (67) is communicated with the air suction pump (7); the solid nano powder collected by the cloth bag collecting component (6) is enriched at the outer side of the cloth bag (66), and the solid nano powder is collected in a storage box (68) at the bottom of the cloth bag collecting component (6) through a collecting mechanism.
6. The plasma arc vapor phase method production system for preparing nano-powder according to claim 5, wherein the collecting mechanism is composed of a connecting rod (630), a hanging chain (64), a knocking plate (631) and a telescopic cylinder (632), the cloth bag (66) is fixed on the connecting rod (630) through the hanging chain (64), and the connecting rod (630) is fixed at the top of the inner side of the cloth bag collecting component (6) through the hanging chain to realize the installation of the cloth bag (66).
7. The plasma arc vapor phase method production system for preparing nano-powder according to claim 6, wherein the knocking plate (631) connected with the telescopic cylinder (632) is arranged outside the cloth bag collecting assembly (6) and rotates through a shaft, one side of the knocking plate (631) extends into the cloth bag collecting assembly (6) and is connected with one end of the connecting rod (630), and the solid nano-powder attached to the outer side of the cloth bag (66) falls through the operation of the telescopic cylinder (632) and is collected in the storage box (68).
8. A method for preparing nano-powder using the plasma arc vapor phase production system according to claim 3, comprising the steps of:
firstly, plasma arc flame combustion method reaction
Firstly, introducing inert gas or oxygen into a plasma arc reaction chamber (2) through a compressor (9), starting a plasma power supply (4), and starting a generator (3) at the top of the plasma arc reaction chamber (2) to work to form plasma arc flame flow; then, metal powder is conveyed to the top end inside the plasma arc reaction chamber (2) through the feeder (1), the metal powder is rapidly reacted through plasma arc flame flow, inert gas is introduced for reaction to obtain metal simple substance nano powder, oxygen is introduced for reaction to obtain metal oxide nano powder, and a high-temperature gaseous reaction product enters the cooling assembly (5) from the bottom of the ion arc reaction chamber (2);
the flame flow temperature at the top of the plasma arc reaction chamber (2) is adjustable at 600-6000 ℃, the reaction time is less than 1s, and the power of the plasma power supply (4) is adjustable at 30-120 kW;
② collecting metal simple substance nano powder or metal oxide nano powder
Under the action of the cooling component (5), the high-temperature gaseous reaction product is rapidly cooled to obtain airflow containing solid nano powder, and finally, the airflow is collected through a cloth bag in the cloth bag collecting component (6);
thirdly, air current circulation
Gas flow discharged by the cloth bag collecting assembly (6) is purified by a purifier (8), stored and pressurized by a compressor (9) and then introduced into the top of the plasma arc reaction chamber (2) again to form gas flow circulation; when the fresh inert gas or oxygen needs to be supplemented, the fresh gas is input from the valve (10).
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115340113A (en) * | 2022-09-19 | 2022-11-15 | 合肥中航纳米技术发展有限公司 | Preparation method of vapor phase method nano alumina |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1482059A (en) * | 2002-09-09 | 2004-03-17 | 张芬红 | System for preparing nanometer silicon nitride powder |
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| CN1482059A (en) * | 2002-09-09 | 2004-03-17 | 张芬红 | System for preparing nanometer silicon nitride powder |
| CN1631586A (en) * | 2005-01-28 | 2005-06-29 | 中国科学院力学研究所 | Manufacturing instrument of superfine metal powder |
| CN101015861A (en) * | 2006-11-09 | 2007-08-15 | 昆山密友实业有限公司 | Continuous production apparatus for nano metal powder |
| CN201006387Y (en) * | 2006-12-07 | 2008-01-16 | 桂林金格电工电子材料科技有限公司 | Dust removing plant for silver-based alloy melting furnace |
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| CN115340113A (en) * | 2022-09-19 | 2022-11-15 | 合肥中航纳米技术发展有限公司 | Preparation method of vapor phase method nano alumina |
| CN115340113B (en) * | 2022-09-19 | 2023-11-14 | 合肥中航纳米技术发展有限公司 | Preparation method of gas-phase nanometer alumina |
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