CN1076211C - Method and system for collecting nm-class powder - Google Patents
Method and system for collecting nm-class powder Download PDFInfo
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- CN1076211C CN1076211C CN98114069A CN98114069A CN1076211C CN 1076211 C CN1076211 C CN 1076211C CN 98114069 A CN98114069 A CN 98114069A CN 98114069 A CN98114069 A CN 98114069A CN 1076211 C CN1076211 C CN 1076211C
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- 239000000843 powder Substances 0.000 title claims abstract description 60
- 238000000034 method Methods 0.000 title claims abstract description 22
- 238000001816 cooling Methods 0.000 claims abstract description 10
- 239000000203 mixture Substances 0.000 claims abstract description 5
- 239000002131 composite material Substances 0.000 claims abstract description 3
- 239000011858 nanopowder Substances 0.000 claims description 24
- 238000005469 granulation Methods 0.000 claims description 11
- 230000003179 granulation Effects 0.000 claims description 11
- 238000000926 separation method Methods 0.000 claims description 10
- 238000002347 injection Methods 0.000 claims description 4
- 239000007924 injection Substances 0.000 claims description 4
- 230000005284 excitation Effects 0.000 abstract description 2
- 238000005453 pelletization Methods 0.000 abstract 1
- 238000011084 recovery Methods 0.000 description 9
- 238000007664 blowing Methods 0.000 description 6
- 239000007789 gas Substances 0.000 description 6
- 238000004062 sedimentation Methods 0.000 description 6
- 239000002245 particle Substances 0.000 description 4
- 238000011109 contamination Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 239000000047 product Substances 0.000 description 3
- 230000005611 electricity Effects 0.000 description 2
- 238000005538 encapsulation Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000008676 import Effects 0.000 description 2
- 235000012054 meals Nutrition 0.000 description 2
- 239000007921 spray Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005367 electrostatic precipitation Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000000706 filtrate Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000002086 nanomaterial Substances 0.000 description 1
- 239000002105 nanoparticle Substances 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 238000002161 passivation Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000009461 vacuum packaging Methods 0.000 description 1
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Abstract
The present invention relates to a collection method of nanometer powder, which is characterized in that nanometer powder is sprayed by using ultrahigh speed airflow for cooling and pelletizing before composite powder is out of a port and the powder is collected, wherein the flow rate of the airflow is between 150 m/s and 400 m/s. The ultrahigh speed airflow is used for the forced excitation of air-powder mixture by the collection method of nanometer powder, which enables intense collision to happen in the nanometer powder and the nanometer powder to pseudoly aggregate into macroparticles. At the same time, unsaturated bonds of the nanometer powder are eliminated, and thus, the fluidity of the nanometer powder is greatly improved. The present invention enables the collection problem of the nanometer powder to be changed into the collection problem of ordinary coarse powder, and thus, a conventional coarse powder collection method can be used for obtaining nanometer powder products of high quality without pollution.
Description
The present invention relates to the collection process and the equipment of nano powder, particularly laser method gas phase synthetising nanometre powder (＜50nm) collection method and device.
The nano powder of＜50nm, surface-active height, the viscosity after synthetic greatly, serious sticking wall.To collect continuously, need the crucial difficult problem of solution many, relate to chemical industry, machinery, the multidisciplinary intersection of material.Nano material has character such as special optics, electricity, acoustics, and extremely application prospects is arranged.Nano powder has determined its price height because preparation technology and raw material are all multifactor, product powder purity height, and therefore contamination-freely to collect encapsulation technology be one of commercial key in application problem of powder to high recovery rate.Gu nano powder is average grain diameter＜50nm gas-separation particularly, be the new problem that chemical field waits to solve, Gu prior art can only realize 〉=gas-separation of the particle of 1 μ m.Up to the present, domestic and foreign literature report nano powder is collected following three methods that mainly contain: 1. high-pressure electrostatic attracts method.Be generally＞200,000 volts of high-tension electricities (being the electrostatic precipitation principle) and since various powders than resistance difference, therefore a kind of equipment can only be collected a kind of powder, so equipment complexity, cost height, and the powder yield is low, and is subject to the corona framework and pollutes.2. liquid N
2Condensation method, it is lower to receive powder efficient and powder recovery rate.3. condense naturally and the sedimentation comminution granulation, this is a United States Patent (USP).The natural subsidence granulation is based on gas, powder mixture is aerocolloidal principle.The laser method nano powder is actually a kind of photochemical fog.Very little nano particle collides mutually because of the Brownian movement of fierceness and becomes than macroparticle, the particle of general 20nm=0.2 μ is by being a granulated into efficiently collection status naturally, at least want 30 minutes, because of natural subsidence speed slower, so equipment needed thereby is very huge, through accurately calculating, the expansion chamber volume is φ 3.5 * 5m at least.
The object of the present invention is to provide a kind of collection method of nano powder, can easyly obtain high-quality free of contamination product powder at low cost with this method.
The invention provides a kind of collection method of nano powder, it is characterized in that: in the composite powder outlet, powder is jetted to nano powder with the ultrahigh speed air-flow before collecting, and with cooling granulation, air-flow velocity is between 150m/s～400m/s.
The present invention adopts the ultrahigh speed air-flow to gas--and powder mixture carries out forced excitation, make strong collision between the nano powder, vacation is agglomerated into macroparticle, eliminated the unsaturated bond of nano powder simultaneously, thereby its flowability improves greatly, being the present invention is transformed into the collection problem of general meal with the collection problem of nano powder, uses conventional meal collection method just can obtain the free of contamination nano powder product of high-quality.
The inventive method should adopt the ultrahigh speed air-flow that powder is blowed twice, promptly the first time cooling blast, the unidirectional powder that blows, granulation second time air ring cooling blast direction blows.In the said process preferably for the second time between granulation air-flow and the first time cooling blast angle between 30～60 °.
Find that in experiment when only using the air-flow of cooling winding-up for the first time, powder is mobile to be changed, but yield is lower.And when only using the air-flow of granulation for the second time, then the powder yield is higher, but it is mobile poor, it is more sticking to be embodied in powder, wall sticking phenomenon is comparatively serious, and it is right to have only two kinds of air-flows to act on simultaneously, and powder passivation granulation effect is best, be embodied in the powder recovery rate more than 92%, and do not have the wall sticking phenomenon generation substantially.
The present invention also provides the nano powder gathering system according to method for preparing, Gu it comprises gas-separation, vent gas treatment, automatic control, Vacuum Package four major parts, it is characterized in that: Gu before gas-separation, install the air prilling device additional, the L type structure of its serve as reasons inlet duff pipe (21) and outlet duff pipe (22) composition, inlet duff pipe (21) bottom is provided with cold gas nozzle (23), its injection direction is outlet duff pipe (22) central axis just, on the outlet duff pipe (22) annular nozzle (24) is set, injection direction focuses on the central axis.The concrete structure of gathering system is seen accompanying drawing 4.(1) cooler among the figure; (2) air prilling device; (3) cyclone separator; (4) eddy current sedimentation device; (5) impulse bag powder collector; (6) intelligent controller; (7) magnetic valve; (8) high vacuum butterfly valve; (9) (10) piping filter; (11) Cycle Unit; (12) unit of finding time; (13) (14) are degassed and are store the powder case; (15) (18) mass flowmenter; (19) vacuum packaging box.
Wherein air prilling device such as Fig. 5, the additional gas flow velocity is controlled by mass flowmenter, according to powder output, replaceable suitable nozzle, then according to nozzle diameter and gas--the powder flow is adjusted flow velocity, until reaching technological requirement.(21) inlet duff pipe among the figure; (22) outlet duff pipe; (23) nozzle; (24) granulation nozzle.
Gu gas-separation comprises cyclone separator (3), eddy current sedimentation device, residual exhaust enters the bag collector spare (6) that the highly dense bright and clean free of contamination import filtrate of import is housed, can make powder recovery rate＞95%, tail gas reaches environmental requirement through piping filter (9) (10) and wants Cycle Unit (11) discharging.Finished powder is put into (13) (14) storage powder case that degass, reach technological requirement after, put into packing glove box (19), the oxygen barrier encapsulation obtains finished powder.
Below in conjunction with embodiment in detail the present invention is described in detail.
Accompanying drawing 1 is embodiment 1 air-flow and the airflow blow direction schematic diagram second time for the first time.
Accompanying drawing 2 is embodiment 2 air-flow and the airflow blow direction schematic diagram second time for the first time.
Accompanying drawing 3 is embodiment 3 air-flow and the airflow blow direction schematic diagram second time for the first time.
Accompanying drawing 4 is a nano powder gathering system structure principle chart.
Accompanying drawing 5 sprays the dust feeder structural representation for the nano powder gathering system.
Embodiment 1
By the synthetic Si of laser Gaseous
3N
4Nano powder carries out blowing for twice to powder with the air-flow of v=350m/s, the blowing direction of twice air-flow as shown in Figure 1, promptly angle is 90 °.Adopt again conventional cyclonic separation ,/eddy current sedimentation, impulse bag receive powder, final powder recovery rate reaches 55%, through grain size analysis, 1 μ powder reaches more than 60%.
By the synthetic Si of laser Gaseous
3N
4Nano powder carries out blowing for twice to powder with the air-flow of v=350m/s, the blowing direction of twice air-flow as shown in Figure 1, promptly angle is 60 °.Adopt conventional cyclonic separation, eddy current sedimentation, impulse bag to receive powder again, final powder recovery rate reaches 75%, and through grain size analysis, 1 μ powder reaches more than 80%.
By the synthetic Si of laser Gaseous
3N
4Nano powder carries out blowing for twice to powder with the air-flow of v=350m/s, the blowing direction of twice air-flow as shown in Figure 1, promptly angle is 45 °.Adopt conventional cyclonic separation, eddy current sedimentation, impulse bag to receive powder again, final powder recovery rate reaches 90%, and through grain size analysis, 1 μ powder reaches more than 95%.
Embodiment 4
Adopt embodiment 3 to blow mode, change spray feed speed.
1. when v＜150m/s, powder viscosity is improved little, yield＜30%.
2. when 150m/s＜v＜300m/s, diameter of particle reaches 85% of 1 μ, and recovery rate is 83%.
3. when 300m/s＜v＜400m/s, diameter of particle reaches 95% of 1 μ, and recovery rate is 90%.
Claims (3)
1. the collection method of a nano powder is characterized in that: in the composite powder outlet, powder is jetted to nano powder with the ultrahigh speed air-flow before collecting, and with cooling granulation, air-flow velocity is between 150m/s～400m/s; The ultrahigh speed air-flow blows twice to powder, i.e. cooling blast for the first time, and the unidirectional powder that blows, the air ring of granulation for the second time cooling blast direction blows.
2. according to the collection method of the described nano powder of claim 1, it is characterized in that: for the second time between granulation air-flow and the first time cooling blast angle between 30～60 °.
3. nano powder collection method, Gu comprise gas-separation, vent gas treatment, automatic control, Vacuum Package four major parts, it is characterized in that: Gu before gas-separation, install the air prilling device additional, the L type structure of its serve as reasons inlet duff pipe (21) and outlet duff pipe (22) composition, the auxilliary tube cell (21) of inlet bottom is provided with cold gas nozzle (23), its injection direction is outlet duff pipe (22) central axis just, on the outlet duff pipe (22) annular nozzle (24) is set, injection direction is gathered on the central axis.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN98114069A CN1076211C (en) | 1998-06-11 | 1998-06-11 | Method and system for collecting nm-class powder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN98114069A CN1076211C (en) | 1998-06-11 | 1998-06-11 | Method and system for collecting nm-class powder |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1239010A CN1239010A (en) | 1999-12-22 |
| CN1076211C true CN1076211C (en) | 2001-12-19 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN98114069A Expired - Fee Related CN1076211C (en) | 1998-06-11 | 1998-06-11 | Method and system for collecting nm-class powder |
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| Country | Link |
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| CN (1) | CN1076211C (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100462137C (en) * | 2006-12-06 | 2009-02-18 | 南京工业大学 | Method for preparing nanopowder |
| CN102085054A (en) * | 2010-10-26 | 2011-06-08 | 东莞富运傢俬有限公司 | Furniture board assembled by honeycomb paper filler and production method thereof |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5128081A (en) * | 1989-12-05 | 1992-07-07 | Arch Development Corporation | Method of making nanocrystalline alpha alumina |
| US5514350A (en) * | 1994-04-22 | 1996-05-07 | Rutgers, The State University Of New Jersey | Apparatus for making nanostructured ceramic powders and whiskers |
-
1998
- 1998-06-11 CN CN98114069A patent/CN1076211C/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5128081A (en) * | 1989-12-05 | 1992-07-07 | Arch Development Corporation | Method of making nanocrystalline alpha alumina |
| US5514350A (en) * | 1994-04-22 | 1996-05-07 | Rutgers, The State University Of New Jersey | Apparatus for making nanostructured ceramic powders and whiskers |
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| Publication number | Publication date |
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| CN1239010A (en) | 1999-12-22 |
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