CN108031649A - A kind of method of metal dust classification - Google Patents
A kind of method of metal dust classification Download PDFInfo
- Publication number
- CN108031649A CN108031649A CN201810071866.XA CN201810071866A CN108031649A CN 108031649 A CN108031649 A CN 108031649A CN 201810071866 A CN201810071866 A CN 201810071866A CN 108031649 A CN108031649 A CN 108031649A
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- China
- Prior art keywords
- classification
- metallic particles
- air
- collection channel
- metal dust
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Classifications
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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
- B07B7/00—Selective separation of solid materials carried by, or dispersed in, gas currents
- B07B7/08—Selective separation of solid materials carried by, or dispersed in, gas currents using centrifugal force
- B07B7/086—Selective separation of solid materials carried by, or dispersed in, gas currents using centrifugal force generated by the winding course of the gas stream
Abstract
A kind of claimed method that air current classifying is used to spherical and spherical micron-level particle size metal dust, to reach particle high dispersive, the high uniformity of particle diameter distribution, without the effect of secondary pollution.The method of the present invention mainly includes following key step：1. material is accelerated using high selectivity pressurized air source, 2. air current classifyings and collection.The broken process for dispersing of the present invention can greatly promote the dispersiveness of different metal grain products, particle diameter uniformity, and effectively remove the irregular metal particle of ultra tiny (average grain diameter is less than 0.1um) and super large (average grain diameter is more than 10um), especially with high-pressure air source power is conveyed as material, and in hierarchy system reflux airflow use, it is possible to prevente effectively from the secondary pollution of apparatus body and environment to product in processing procedure, so that the metal dust product made fully meets the high-end electrocondution slurry of production and 3D printing material.
Description
Technical field
The invention belongs to metal dust to be classified processing technology field, and in particular to spherical and spherical metal dust product is pressed
The method that classification collection processing is carried out according to different-grain diameter.
Background technology
High-crystallinity, high dispersive, high particle diameter uniformity, the metal dust of high spherical morphology are in solar energy, 3D printing, electronics
The industry such as the electronic component manufacture of industry, battery and chemical industry catalysis, jewellery is widely used.With solar energy, 3D printing
The height of material becomes more meticulous development, and development of the electronic component to miniature and high-performance direction, to the particle diameter of metal dust
Uniformity (width of PSD) requires higher and higher.
The classification processing of traditional different-grain diameter metal dust uses mechanical grading and air flow centrifuge grading：Mechanical grading by
In the limitation of mesh size, the screening for micro-sized metal powder can not efficiently separate, especially small size particle；Airflow centrifugal
Classification using different leaves different-grain diameter under different rotation rates particle by when be classified, this mode is to little particle
Grading effect is bad, especially because causing the de- of blade surface metal when being graded metallic particles and the collision of high-speed rotating blade
Fall so as to polluted product.In order to solve the above technical problems, the present invention comes therefrom.
The content of the invention
The technical problems to be solved by the invention are to overcome the metallic particles classification technique problem of the prior art, there is provided a kind of
Spherical and spherical micron-level particle size metal dust processing step, and optimum organization, especially surface of metal particles is coated
Processing, and convey and be classified by the use of air-flow as power, so as to reach to material high dispersive, the high uniformity of particle diameter distribution, does not have
There is secondary pollution.
In order to solve the above technical problems, the present invention provides a kind of method of metal dust classification processing, it includes as follows
Step：
(1) metal dust of processing to be fractionated is added to feed inlet, recycles high pressure draught that material is sent to classification and collect
The singulizing disc of device；
(2) at least two classification collection channel is constructed by link stopper in singulizing disc, these classification collection channels
Respective cyclone trap in graded collecting device is connected respectively, and gases at high pressure carry metal-powder material and are classified into singulizing disc
After collection channel, when running under the action of air-introduced machine reflux airflow, then the weight size according to metallic particles, along block
Curved surface flows, and into different passages, then can pass through the metallic particles in cyclone trap collection different-grain diameter section.
In currently preferred technical solution, the metal dust of step (1), which is added to, is connected to graded collecting device feed inlet
Automatic feeder, and automatic feeder charging use vector screw feeder.0.1 kilogram per hour~300 kilograms of feeding quantity
Differ.The feed inlet is Venturi tube feed inlet.
The gases at high pressure of step (1) using compressed air either high pressure nitrogen or high pressure argon gas, pressure for 0.01Mpa~
15Mpa。
,, will be with air-flow edge compared with light metallic particles because its inertia is small in step (2) in currently preferred technical solution
The flowing of alloy block link stopper curved surface；Into the cyclone trap of near classification collection channel, heavier metallic particles because
Inertia is big, flies to remote classification collection channel；Into the cyclone trap of classification collection channel farther out, most heavy metal
Grain flies because inertia is big to farthest classification collection channel；Into the cyclone trap of farthest classification collection channel；Thus,
The metallic particles of different quality particle diameter is different according to its quality, is caught respectively from the different passages of different blocks structure into whirlwind
Storage.
In step (2), block is antifriction alloy link stopper, and constructing two or three classifications by link stopper in singulizing disc collects
Passage.
In currently preferred technical solution, step (3) is further included, air-introduced machine both ends connect institute respectively by reflux air hose
Cyclone trap outlet and singulizing disc reflux gas import are stated, and the pressure difference by being installed respectively in air-introduced machine entrance and exit becomes
Device is sent, to control (pneumatically or electrically) butterfly valve and the variable-frequency electric of air-introduced machine for being installed on on the reflux air hose of singulizing disc respectively
Machine, so that by controlling butterfly valve opening size and air-introduced machine rotating speed, then ensures that air-introduced machine returns in singulizing disc and cyclone trap
Flow and pressure are flowed, controls the return pressure balance in whole system.So that the flying distance of effective stability contorting metallic particles,
Direction and the collecting effect of cyclone trap, stablize the metallic particles product for obtaining different-grain diameter section.
In currently preferred technical solution, the metal dust be selected from silver metal particles or titanium alloy metallic particles or
Nickel cobalt metallic particles or wicker copper metallic particles or silver-colored nickel coat metallic particles.
The metal dust or particle of the present invention typically refers to spherical and spherical metal dust or particle.
Advantages and beneficial effects of the present invention are：
(1) method of the invention utilizes vector batcher, stablizes inlet amount, and utilize automatic control system control classification
System interior air-flow pressure balance substantially improves the particle diameter distribution of metallic particles and disperses, and reaches high dispersive, particle diameter distribution is high by one
The requirement of cause property, to average grain diameter at 0.2-50 microns, and maximum particle diameter is no more than 100 microns of metal ball shaped and spherical powder
Body raw material be effectively classified and disperse according to different-grain diameter section.
(2) method of the invention can pass through a:Adjust automatic feeder charging rate, b:Adjust the pressure of gases at high pressure
With flow, c:Adjust position, the d of alloy link stopper:Adjust air-introduced machine reflux air quantity and wind pressure, e:Regulating butterfly valve aperture, stable
To different-grain diameter section and the high score lively stock of yield.
(3) method of the invention can be handled the metal dust product of sensitivity, such as prevented by selecting different high-pressure air sources
It is quick-fried, anti-oxidation requirement etc..Obtained metal dust product fully meets high-end electrocondution slurry (the positive silver paste of solar energy) and 3D printing
The requirement of material polymolecularity, high particle diameter uniformity, high-purity.
(4) method of the invention can completely avoid during apparatus body is crushed, is classified and collected to the secondary of product
Pollution.
(5) method treating capacity of the invention is big, scattered, loss is small, the degree of automation is high, effectiveness of classification is high, yield is steady
It is fixed.
Brief description of the drawings
Fig. 1 is the initial size distribution map of SMT001 series silver powder raw materials.
Fig. 2 is the fine powder grain size distribution after SMT001 series silver powder classification processing.
Fig. 3 is the medium silt footpath distribution map after SMT001 series silver powder classification processing.
Fig. 4 is the coarse powder grain size distribution after SMT001 series silver powder classification processing.
Fig. 5 is the electromicroscopic photograph SEM (1.5K) of SMT001 series silver powder raw materials.
Fig. 6 is SMT001 series silver powder fine powder electromicroscopic photograph SEM (1.5K) after processing.
Fig. 7 is powder electromicroscopic photograph SEM (1.5K) in SMT001 series silver powder after processing.
Fig. 8 is SMT001 series silver powder coarse powder electromicroscopic photograph SEM (1.5K) after processing.
Fig. 9 is the initial size distribution map of S6 series silver powder raw materials.
Figure 10 is the fine powder grain size distribution after S6 series silver powder classification processing.
Figure 11 is the medium silt footpath distribution map after S6 series silver powder classification processing.
Figure 12 is the coarse powder grain size distribution after S6 series silver powder classification processing.
Figure 13 is the electromicroscopic photograph SEM (1.5K) of S6 series silver powder raw materials.
Figure 14 is S6 series silver powder fine powder electromicroscopic photograph SEM (1.5K) after processing.
Figure 15 is powder electromicroscopic photograph SEM (1.5K) in S6 series silver powder after processing.
Figure 16 is S6 series silver powder coarse powder electromicroscopic photograph SEM (1.5K) after processing.
Figure 17 is the electromicroscopic photograph SEM of titanium alloy raw material powder.
Figure 18 is the middle powder electromicroscopic photograph SEM obtained after titanium alloy particle classifying is handled.
Figure 19 is the method flow diagram of the metal dust homogenizing processing of one embodiment of the invention.
Embodiment
Such scheme is described further below in conjunction with specific embodiment.It is to be understood that these embodiments are to be used to illustrate
The present invention and be not limited to limit the scope of the invention.The implementation condition used in embodiment can be done according to the condition of specific producer
Further adjustment, the implementation condition being not specified is usually the condition in normal experiment.
Introduce and summarize
The present invention by way of example rather than provides the mode of limitation to illustrate.It should be noted that in present disclosure
Described " one " or " one kind " embodiment is not necessarily referring to same embodiment, and refers at least a kind of.
Various aspects of the invention are described below.However, as will be readily apparent to one of skill in the art, can
According to the present invention only some or all of aspects implement the present invention.For purposes of illustration, provide herein specific numbering, material and
Configuration, enables one to thoroughly understand the present invention.However, be evident that for those of skill in the art,
The present invention can be implemented without concrete details.In other examples, not make the present invention is obscure many institutes have been omitted or simplified
Known feature.
Various operations are described successively as multiple discrete steps, and with most helpful in the side for understanding the present invention
Formula illustrates；However, in-order description should not be construed as to imply that these operations are necessarily dependent on order.
Reactant according to type species is illustrated to various embodiments.To be shown for those of skill in the art and
It is clear to, any number of different types of reactant can be used to implement for the present invention, and be more than those for the purpose of illustration
And the reactant provided herein.In addition, also it is evident that, the invention is not limited in any specific mixing is shown
Example.
The graded collecting device used in the present invention, model：(Suzhou Si Meite surfacing science and technology is limited by SMT-BD-30H
Company manufactures).Graded collecting device includes automatic feeder, singulizing disc, a plurality of cyclone traps and an air-introduced machine, and automatically
Batcher is connected to singulizing disc by Venturi tube,
At least two classification collection channel is constructed by link stopper in singulizing disc, these classification collection channel difference
Respective cyclone trap is connected,
Air-introduced machine connects singulizing disc reflux wind inlet by air hose one end of flowing back, and the other end is connected respectively by a manifold
(a plurality of) outlets of cyclone trap,
And pressure difference transmitter is separately installed with the air-introduced machine entrance and exit, enter classification to control to be installed on respectively
The variable-frequency motor of pneumatically or electrically butterfly valve and air-introduced machine on the reflux air hose of disk, controls butterfly valve opening size and air-introduced machine to turn
Speed, has been effectively ensured air-introduced machine return flow and pressure in singulizing disc, while ensures that the stream pressure in cyclone trap is steady,
So as to control the return pressure in whole system to balance.
Embodiment 1
20 kilograms of broken good scattered spherical SMT001 silver powder are taken to be added to classification and collection device by automatic feeder,
Using compressed air as high-pressure air source, pressure is 3 kilograms, 10 kgs/hour of delivery rate, air-introduced machine reflux tolerance 70%；
Take fine powder, middle powder, coarse powder verification the verifying results：a:PSD data and grain size distribution (Fig. 1~4)；b:Electromicroscopic photograph：SMT001 series
Powder, SMT001- coarse powder (Fig. 5~8) in silver powder raw material, SMT001- fine powders, SMT001-；Analyzed by electromicroscopic photograph and PSD, can
It is fine to be clearly visible the particle diameter distribution uniformity of ball shape silver powder after treatment, while improve dispersiveness.
Table 1：In embodiment 1 S3 series silver powder before and after the processing PSD data statistics and distribution map：
| Classification | D10 | D50 | D90 | D100 |
| SMT001 series silver powder raw materials | 0.93 | 1.61 | 2.72 | 5.11 |
| SMT001 series silver powder fine powder after processing | 0.55 | 0.99 | 1.75 | 3.22 |
| Powder in SMT001 series silver powder after processing | 0.92 | 1.54 | 2.58 | 4.54 |
| SMT001 series silver powder coarse powder after processing | 1.54 | 3.15 | 5.79 | 9.9 |
Embodiment 2
Take 100 kilograms of scattered spherical silver powder of S6 series crushed to be added to classification by automatic feeder and collect to fill
Put, using compressed air as high-pressure air source, pressure is 6 kilograms, 50 kgs/hour of delivery rate, air-introduced machine reflux tolerance
80%；After classification and collection, fine powder, middle powder, coarse powder verification the verifying results are taken：a:PSD data and grain size distribution (Fig. 9~
12)；b:Electromicroscopic photograph：Powder, S6- coarse powder (Figure 13~16) in S6 series silver powder raw material, S6- fine powders, S6-；Pass through electromicroscopic photograph
Analyze with PSD, it can clearly be seen that the particle diameter distribution uniformity of ball shape silver powder after treatment is fine, while improve scattered
Property.
The S6 series silver powder of 2 embodiment 2 of table before and after the processing PSD data statistics and distribution map：
| Classification | D10 | D50 | D90 | D100 |
| S6 series silver powder raw materials | 0.71 | 1.19 | 1.96 | 3.12 |
| S6 series silver powder fine powder after processing | 0.43 | 0.79 | 1.45 | 2.74 |
| Powder in S6 series silver powder after processing | 0.78 | 1.29 | 2.12 | 3.94 |
| S6 series silver powder coarse powder after processing | 1.17 | 1.68 | 2.4 | 4.01 |
Embodiment 3
5 kilograms of scattered titanium alloy spherical powders are taken to be added to classification and collection device by automatic feeder, using nitrogen
Gas is as high-pressure air source, and pressure is 4 kilograms, 5 kgs/hour of delivery rate, and air-introduced machine reflux tolerance 90% takes middle powder shooting such as
Lower electromicroscopic photograph：SEM3- titanium alloy raw material powder electromicroscopic photographs (Figure 17), the middle powder (Figure 18) obtained after SEM3- classifications and collection；
By electromicroscopic photograph, it can clearly be seen that the particle diameter distribution uniformity of material after treatment is fine, and its point is greatly improved
Dissipate property.
Specific embodiment described above is only the preferred embodiment of the present invention, it is noted that for the art
For those of ordinary skill, without departing from the principle of the present invention, some improvement or replacement can also be made, these improvement
Or replace and should also be as being considered as protection scope of the present invention.
Claims (7)
1. a kind of method of metal dust classification, its feature are that it includes the following steps：
(1) metal dust of processing to be fractionated is added to feed inlet, recycles high pressure draught that material is sent to graded collecting device
Singulizing disc；
(2) at least two classification collection channel is constructed by link stopper in singulizing disc, these classification collection channel difference
Connect respective cyclone trap, gases at high pressure are carried after metal-powder material enters singulizing disc classification collection channel, when running into
Under the action of air-introduced machine reflux airflow, then the weight size according to metallic particles, will flow along the curved surface of block, into
Enter different passages, then the metallic particles in different-grain diameter section can be collected by cyclone trap.
2. the method for classification processing according to claim 1, it is characterised in that the metal dust of step (1) is added to connection
The automatic feeder of graded collecting device feed inlet, and automatic feeder charging uses vector screw feeder.
3. the method for classification processing according to claim 1, it is characterised in that in step (1), the feed inlet is literary mound
In pipe feed inlet.
4. it is according to claim 1 classification processing method, it is characterised in that in step (2), lighter metallic particles into
Enter the cyclone trap of near classification collection channel；Heavier metallic particles flies to remote classification collection channel, into farther out
Classification collection channel cyclone trap；Most heavy metallic particles flies to farthest classification collection channel, into farthest
It is classified the cyclone trap of collection channel；The metallic particles of different quality particle diameter is different according to its quality, respectively from different blocks
Enter cyclone trap in the different passages of structure.
5. the method for classification processing according to claim 1, it is characterised in that in step (2), the block is resistance to break-in
Golden link stopper；And two or three classification collection channels are constructed by link stopper in singulizing disc.
6. the method for the classification processing according to claim 1 or 3, it is characterised in that further include step (3), air-introduced machine two
End connects the cyclone trap outlet and singulizing disc reflux airflow import respectively by reflux air hose, and by air-introduced machine entrance
The pressure difference transmitter installed respectively with outlet, to control the butterfly valve and air inducing that are installed on on the reflux air hose of singulizing disc respectively
The variable-frequency motor of machine, so that by controlling butterfly valve opening size and air-introduced machine rotating speed, then ensures singulizing disc and cyclone trap
Interior air-introduced machine return flow and pressure, control the return pressure balance in whole system.
7. the method for classification processing according to claim 1, it is characterised in that the metal dust is selected from silver metal
Grain or titanium alloy metallic particles or nickel cobalt metallic particles or wicker copper metallic particles or silver-colored nickel coat metallic particles.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810071866.XA CN108031649B (en) | 2018-01-25 | 2018-01-25 | Method for grading metal powder |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810071866.XA CN108031649B (en) | 2018-01-25 | 2018-01-25 | Method for grading metal powder |
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| CN108031649A true CN108031649A (en) | 2018-05-15 |
| CN108031649B CN108031649B (en) | 2020-02-07 |
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| CN201810071866.XA Active CN108031649B (en) | 2018-01-25 | 2018-01-25 | Method for grading metal powder |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109852810A (en) * | 2019-04-12 | 2019-06-07 | 杭州因迈科技有限公司 | A kind of method for recovering precious metals of waste printed circuit board powder |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2356758Y (en) * | 1999-03-17 | 2000-01-05 | 中国科学院低温技术实验中心 | Pneumatic airflow classifier |
| JP2003225617A (en) * | 2002-02-01 | 2003-08-12 | Ohashi Hiroyuki | Cyclone classifier |
-
2018
- 2018-01-25 CN CN201810071866.XA patent/CN108031649B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2356758Y (en) * | 1999-03-17 | 2000-01-05 | 中国科学院低温技术实验中心 | Pneumatic airflow classifier |
| JP2003225617A (en) * | 2002-02-01 | 2003-08-12 | Ohashi Hiroyuki | Cyclone classifier |
Non-Patent Citations (1)
| Title |
|---|
| 陶京平等: "旋风式分级机的技术进展综述", 《硫磷设计与粉体工程》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109852810A (en) * | 2019-04-12 | 2019-06-07 | 杭州因迈科技有限公司 | A kind of method for recovering precious metals of waste printed circuit board powder |
| CN109852810B (en) * | 2019-04-12 | 2020-06-30 | 杭州因迈科技有限公司 | Precious metal recovery method for waste circuit board powder |
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| Publication number | Publication date |
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| CN108031649B (en) | 2020-02-07 |
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