KR100958614B1

KR100958614B1 - Method and system classificating and collecting of magnetic nanopowders prepared by wire explosion in liquid

Info

Publication number: KR100958614B1
Application number: KR20070115163A
Authority: KR
Inventors: 조주현
Original assignee: 한국전기연구원
Priority date: 2007-11-13
Filing date: 2007-11-13
Publication date: 2010-05-19
Also published as: KR20090049102A

Abstract

The present invention relates to a method and system for classifying and recovering magnetic nanopowders prepared by electroexplosion in liquid, and more particularly, to classifying magnetic nanopowder particles from colloidal liquid generated by electroexplosion, thereby providing a classification apparatus. Reduce the cost and management cost, and design the structure of the large particle and small particle classifier in the transverse and longitudinal direction, respectively, to precipitate the nanopowder particles in two stages, thereby reducing the relatively small size from the large particles. The present invention relates to a method and a system for classifying and recovering magnetic nanopowders prepared by electroexplosion in a liquid that sequentially classifies and collects particles.

In the present invention, the colloid generated by the electric explosion in the liquid is classified and collected nanoparticle particles by the magnet and partition of the classification device, the organic liquid separated nanopowder particles are reintroduced into the explosion chamber by the circulation device in the liquid Provided are a method and system for classifying and recovering magnetic nanopowders prepared by electroexplosion.

Nanopowder, Electric Explosion, Colloid, Classification, Magnetic Materials, Precipitation, Magnet, Partition

Description

Method and system classificating and collecting of magnetic nanopowders prepared by wire explosion in liquid}

Recently, the development of nanostructured powder materials as a new material has been very important because it can be applied as a foundation technology in a new field including nano devices.

The ultra fine powder material can exhibit unusual electro-magnetic, mechanical, and catalytic properties that cannot be obtained with conventional materials due to the finer material structure (100 nm or less) and the increase in surface area. Therefore, ultra-high strength parts, magnetic parts, Next-generation functional materials, such as thermoelectrics, sensors, filters, and catalysts, must create new demand throughout the industry.

With the development of the high-tech industry, the performance and miniaturization of components and systems are progressing. Currently, component factors having a phenomenological length of micron or submicron, which determine physical / chemical / biological characteristics, are used.

Therefore, the importance of nanotechnology is a technology that can overcome the limitations of the existing technology for high performance and miniaturization of parts and systems, and it is typical and cutting-edge of future technology because new performance can be expressed as the phenomenological length decreases. It is an essential element in product development.

At present, a variety of methods are known for producing a material from nanopowders, but among them, metal nanopowder manufacturing technology by an electric explosion method using pulse power is widely known and is being actively researched.

The nanopowder manufacturing method using pulse power not only has a very important meaning in terms of industrial applications, but is also economically advantageous compared to other methods of preparing nanopowders.

Here, look at the metal nanopowder manufacturing method by the electric explosion method using the pulse power as follows.

Existing metal nanopowder manufacturing method using an electroexplosion method in the air, providing a predetermined chamber filled with air or an inert gas; Feeding a metal wire into the chamber; Electrically exploding and vaporizing the metal wire in the chamber using pulse power; Including the step of collecting the metal nano-powder generated by cooling / condensation by the atmosphere gas using an air filter, and the like.

However, the nano-powder manufacturing method according to the conventional air-explosion method proceeds to the above process has a problem that it is virtually impossible to classify by size because the particles produced by the electroexplosion is strongly aggregated.

Therefore, the nanopowder manufacturing method by the submerged electroexplosion method proposed to supplement the nanopowder manufacturing method by the electroexplosion method of the air is prepared in a form in which the particles are well dispersed, each particle size by a method such as centrifugal separation It becomes possible to classify.

However, such a method of centrifugation has a problem in that it takes excessive cost and time when producing a large amount of nanopowders.

The present invention has been made to solve the above problems, it is to improve the configuration of the system for classifying and recovering the nano-powder prepared by the conventional electrolytic explosion in the liquid, the colloidal liquid generated by the electroexplosion in the liquid is partitioned and Through the large particle and small particle classifying device equipped with magnet, the particles of magnetic material nano powder are classified and collected from the colloidal liquid, so that the system can be classified and collected at low cost and time even in the system for producing nano powder in large quantities. It is an object of the present invention to provide a method and system for classifying and recovering magnetic nanopowders prepared by electroexplosion.

The present invention for achieving the above object

An explosion chamber in which the explosive material is electrically exploded in liquid;

A collecting tube and a storage container installed at one side of the explosion chamber to collect and store colloidal liquid ejected during an electrical explosion;

A large particle classifying device connected to the storage container, wherein the particles in the colloidal liquid flowing through the flow control valve are primarily classified by the transverse magnets;

A small particle classifying apparatus connected to the large particle classifying apparatus, wherein the particles in the colloid classified in the large particle classifying apparatus are classified secondly by a seed magnet;

A circulation device for reflowing the organic liquid from which particles are separated by the small particle classification device into the explosion chamber;

And a control unit.

In addition, the large particle classification device is installed on one side of the flow control valve and the horizontal chamber is formed long in the transverse direction; A plurality of large particle partitions mounted in the transverse chamber; A transverse magnet installed surrounding the lower portion of the transverse chamber;

And a control unit.

The small particle classifier may include a longitudinal chamber communicating with the large particle classifier, the longitudinal chamber being elongated in the longitudinal direction; A small particle partition mounted in the center of the vertical chamber; Seed magnets are installed while surrounding the lower portion of the seed chamber;

And a control unit.

In addition, the large particle partition or the small particle partition is characterized in that the spaced apart from the inner bottom surface of the transverse chamber or longitudinal chamber by a predetermined distance,

In addition, the transverse magnet and the seed magnet is characterized in that consisting of a permanent magnet or an electromagnet.

In one preferred embodiment,

(a) liquid exploding a large amount of explosive material in an explosion chamber;

(b) collecting the colloidal liquid ejected by the liquid electroexplosion into a collecting tube and storing the colloidal liquid in a storage container;

(c) introducing a colloidal liquid stored in the storage container into the large particle classifier by using a flow control valve;

(d) first classifying particles in the colloidal liquid introduced into the large particle classifying apparatus by means of large particle partitions and transverse magnets;

(e) classifying the particles in the colloidal liquid that has passed through the large particle classifying apparatus by means of small particle partitions and seed magnets secondly;

(f) reflowing the organic liquid in which the particles are classified through the large particle and small particle classification device into the explosion chamber by a circulation device;

And a control unit.

In the step (d), the colloidal liquid introduced into the large particle classifier passes through the lower part of the large particle partition, and particles of the larger size in the colloidal liquid are precipitated by the magnetic force of the transverse magnet installed in the lower part of the transverse chamber during the passage. It is characterized by consisting of steps.

In the step (e), the colloidal liquid that has passed through the large particle classifier passes through the lower part of the small particle partition, and particles of small size in the colloidal liquid are precipitated by the magnetic force of the seed magnet installed in the lower part of the vertical chamber during the passage. It is characterized by consisting of steps.

As described above, the method and system for classifying and recovering the magnetic nanopowder prepared by the liquid explosion in the liquid according to the present invention provide the following effects.

First, the magnetic nanopowder particles are classified from the colloidal liquid generated by the electric explosion by using a classifier equipped with a magnet, so that the nanopowders are classified and collected at a low installation cost and management cost even in a system for producing a large quantity of nanopowders. ,

By designing the structure of the large particle and the small particle classifier in the transverse direction and the longitudinal direction, respectively, and by differently designing the number and size of the partitions installed in the chamber, the nano powder particles are precipitated in two steps,

Accordingly, the particles are classified and collected sequentially from the larger particles to the smaller particles, thereby increasing the efficiency of classification and collection.

The terminology used herein is for the purpose of describing particular example embodiments only and is not intended to be limiting of the present invention. A singular expression includes a plural expression unless the context clearly indicates otherwise. In this application, the terms “comprises” or “having” are intended to indicate that there is a feature, number, step, action, component, part, or combination thereof described in the specification, and one or more other It is to be understood that the present invention does not exclude the possibility of the presence or the addition of features, numbers, steps, operations, components, parts, or a combination thereof.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a view showing the collection of nanoparticles contained in the colloid using a permanent magnet, Figure 2 is a view showing a system for classifying and recovering the magnetic nanopowder prepared by the liquid electroexplosion according to the present invention 3 is a perspective view of a large particle classifier according to the present invention, and FIG. 4 is a perspective view of a small particle classifier according to the present invention.

First, as a basic principle of the present invention, a process of capturing nanopowder contained in a colloid using a permanent magnet will be described.

As shown in FIG. 1A, a liquid 100 in which a nickel nanopowder prepared by a liquid phase (distilled water) electroexplosion is dispersed in a colloidal state is contained in a transparent volume 110 of a constant volume. The permanent magnet 120 is closely located on one side of the transparent tube 110.

After a certain time has elapsed, as shown in B and C of FIG. 1, the nickel nano powder 130 gathers around the permanent magnet 120, and eventually, most of the nickel nanoparticles 130 dispersed in distilled water (130). ) Is collected around the permanent magnet 120 so that the liquid of the transparent tube 110 is transparent.

Thereafter, when the permanent magnet 120 is away from the transparent tube 110, as shown in FIG. 1D, the nickel nanoparticles 130 are collected in the permanent magnet 120 (contact surface shape with the permanent magnet). It will fall while keeping).

By applying this phenomenon to a continuous process, it is possible to implement the nanopowder classification and recovery system of the present invention, which makes it possible to control the precipitation position and the precipitation rate according to the speed of the colloidal fluid in which the nanopowder is dispersed, the strength and weakness of the magnet and the particle size. do.

According to the present invention applying the above principle, colloidal particles generated by electroexplosion in liquid are classified and collected by magnets 243 and 262 and partitions 242 and 251 through large and small particle classifiers 240 and 250. In addition, the liquid in which the nanopowder particles are separated provides a system for classifying and recovering the magnetic nanopowder prepared by electroexplosion in a liquid which is reintroduced into the explosion chamber 200 by the circulation device 260.

Hereinafter, a detailed description of the respective components of the system for classifying and recovering the magnetic nanopowder prepared by the liquid explosion in the liquid of the present invention will be described in detail for the method for classifying and recovering the nanopowder.

As shown in FIG. 2, the explosion chamber 200 forms a predetermined space therein and is filled with an organic liquid 201 such as distilled water and alcohol.

In addition, the explosive material (magnetic material affected by magnetic force) 202 transferred into the organic liquid 201 of the explosion chamber 200 is supplied with pulse power to the electrode 203 in the liquid to be electrically exploded.

At this time, the explosive material 202 is introduced into the explosion chamber 200, and the exploded material is exploded by a separate means repeatedly, it is preferable that a large amount of nanomaterials by liquid electroexplosion is produced. .

A sampling tube 210 is formed at one side of the explosion chamber 200 to collect a part of colloidal liquid (nanoparticles dispersed in a colloidal state) that is ejected during an electrical explosion.

The collection tube 210 is connected to the storage container 220 of a transparent material so that the collected colloidal liquid is temporarily stored in the storage container 220.

One side of the storage container 220 is a flow rate control valve 230 is installed to adjust the flow rate of the colloidal liquid flowing into the large particle classification device 240 from the storage container 220.

Here, the flow rate of the colloidal liquid flowing into the large particle classifier 240 is adjusted according to the size, position, quantity and the speed of the colloidal liquid precipitated in the large particle and small particle classifier (250).

The large particle classifying device 240 is connected to the flow control valve 230 so that the particles in the colloidal liquid introduced into the proper amount through the flow control valve 230 is classified first.

In particular, the large particle classifier 240 is equipped with a plurality of large particle partitions (242) in the interior of the horizontal chamber 241 formed long horizontally, the lower outer side of the horizontal chamber 241 The transverse magnet 243 is installed surrounding the transverse chamber 241.

In addition, as shown in FIG. 3, the large particle partition 242 is spaced apart from the inner bottom surface of the lateral chamber 241 by a predetermined distance while keeping the central space of the lateral chamber 241 closed, thereby adjusting the flow rate control valve 230. The colloidal liquid introduced through) passes through the bottom of the large particle partition 242 (inner bottom surface of the transverse chamber 241).

Then, the flow rate of the colloidal liquid is controlled by the flow rate control valve 230 to prevent the colloidal liquid from overflowing into the upper space of the large particle partition 242.

At this time, the lower part of the large particle partition 242 is provided with a horizontal magnet 243 closely, the particles in the colloidal liquid passing through the lower part of the large particle partition 242 is settled by the magnetic force of the horizontal magnet 243. .

Here, the larger particles are precipitated in front of the cross-chamber 241 by the attraction force with the magnet increases as the size and weight of the particles, and the particles of a relatively small size precipitates toward the rear.

In addition, the horizontal magnet 243 bar can be used for permanent magnets or electromagnets, in the case of permanent magnets can not adjust the size of the magnetic force, but there is an advantage that the installation cost and operating costs are low, in the case of electromagnets cost a lot of magnetic force There is an advantage that can change the size and existence of the class according to the classification conditions.

One side of the large particle classifier 240 is provided in communication with the small particle classifier 250, thereby to classify the particles that are not separated by the primary classification.

As shown in FIG. 4, the small particle classifying apparatus 250 is equipped with one small particle partition 251 in the inner center of the longitudinal chamber 253 which is formed of a longitudinal shape, and the lower outer side of the vertical chamber 253. The seed magnet 252 is installed surrounding the seed chamber 253.

At this time, the longitudinal chamber 253 is formed long in the longitudinal direction is the longitudinal chamber (collar liquid, the particles are separated from the primary particle sorting device 240, the length of the vertical chamber (long) flows to move in the small particle classifier 250) This is to allow for a long stay in 253, so that even very small particles can be deposited in the longitudinal chamber 253.

The small particle partition 251 is longer than the large particle partition 242 as the height of the longitudinal chamber 253 is higher than the height of the horizontal chamber 241.

In addition, the small particle partition 251 is installed at a predetermined distance from the inner bottom surface of the longitudinal chamber 253, colloid passing through the small particle partition 251 in the same manner as the large particle classification device 240. Small particles in the liquid are precipitated by the seed magnet 252.

However, the seed magnet 252 is formed longer in the longitudinal direction than the transverse magnet 243 to precipitate even the small particles that stay in the longitudinal chamber 253 in the lower longitudinal chamber 253.

As the circulator 260 is installed at one side of the small particle classifier 250, the organic liquid 201 in which particles are separated through the large particle and small particle classifier 250 is transferred to the explosion chamber 200. Allow reflow.

Specifically, the organic liquid 201 from which the particles are separated is introduced into the explosion chamber 200 along the circulation pipe 261 by driving the circulation motor 264, and the inflow amount of the organic liquid 201 is the small particle classifying apparatus. 250 is controlled by the discharge valve 262 located on one side and the inlet valve 263 located on one side of the explosion chamber 200.

Hereinafter, a method of recovering and classifying nanopowder particles by a system for classifying and recovering nanopowders according to the present invention will be described with reference to the accompanying drawings.

5 is a view showing a flow of a system for classifying and recovering magnetic nanopowders prepared by submerged electroexplosion according to the present invention.

First, the explosive material 202 flowing into the explosion chamber 200 is electroexploded in the organic liquid 201, and the colloidal liquid ejected by the electrical explosion communicates with the explosion chamber 200 using the collection pipe 210. It is temporarily stored in the storage container 220.

Thereafter, the colloidal liquid stored in the storage container 220 is supplied to the horizontal chamber 241 of the large particle classifier 240 so that an appropriate amount of movement is maintained using the flow control valve 230.

In addition, the colloidal liquid introduced into the transverse chamber 241 passes through the lower portion of the large particle partition 242, and the particles contained in the colloidal liquid during the passage pass through the magnetic force of the transverse magnet 243 installed at the bottom of the transverse chamber 241. Will be precipitated by

At this time, larger particles are precipitated in front of the lateral chamber 241, and relatively smaller particles are precipitated toward the rear.

Next, the colloidal liquid classified first in the large particle classifier 240 is introduced into the vertical chamber 253 in communication with the transverse chamber 241 to pass through the small particle partition 251, the large particles in the colloidal liquid Particles that are not classified in the classifier 240 are precipitated by the magnetic force of the seed magnet 252 installed under the seed chamber 253.

Here, by increasing the height of the vertical chamber 253 than the transverse chamber 241 to increase the time the colloidal liquid stays in the vertical chamber 253, the small particle classifier 250 classifies in the large particle classifier 240 Even the smallest particles that are not available can be classified.

Subsequently, the organic liquid 201 in which the colloidal liquid particles are separated through the large particle and small particle classification apparatuses 240 and 250 is reintroduced into the explosion chamber 200 by the circulation device 260.

In this way, the colloidal liquid generated by the electroexplosion in the liquid passes through the large particles and the small particle classifying apparatuses 240 and 250 provided with partitions and magnets, and the particles of the magnetic material nanopowder are classified and collected from the colloidal liquid. Even systems that manufacture large quantities can be classified and collected at low cost and time.

While the invention has been shown and described with respect to certain preferred embodiments thereof, the invention is not limited to these embodiments, and has been claimed by those of ordinary skill in the art to which the invention pertains. It includes all the various forms of embodiments that can be carried out without departing from the spirit.

1 is a view showing that the nanoparticles contained in the colloid is collected using a permanent magnet,

2 is a view showing a system for classifying and recovering magnetic nanopowders prepared by submerged electroexplosion according to the present invention;

3 is a perspective view of a large particle classifier according to the present invention,

4 is a perspective view of a small particle classifier according to the present invention,

5 is a view showing a flow of a system for classifying and recovering the magnetic nanopowders prepared by the liquid explosion in liquid according to the present invention.

200: explosion chamber 210: collecting tube

220: storage container 230: flow control valve

240: large particle classifier 250: small particle classifier

260: circulation device 261: circulation pipe

Claims

(a) liquid exploding the explosive material in an explosion chamber;

Method for classifying and recovering the magnetic nano-powder prepared by the liquid explosion in the liquid comprising a.

The method of claim 1, wherein the step (d) is a colloidal liquid flowing into the large particle classification device passes through the lower portion of the large particle partition, the large size in the colloidal liquid by the magnetic force of the transverse magnet installed in the lower portion of the transverse chamber during passage A method for classifying and recovering magnetic nanopowders prepared by electroexplosion in a liquid, characterized in that the particles are precipitated.

The colloidal liquid of claim 1, wherein the colloidal liquid that has passed through the large particle classifier passes through a lower portion of the small particle partition, and has a small size in the colloidal liquid due to the magnetic force of the seed magnet installed in the lower portion of the seed chamber. A method for classifying and recovering magnetic nanopowders prepared by electroexplosion in a liquid, characterized in that the particles are precipitated.

A system for classifying and recovering magnetic nanopowders prepared by submerged electroexplosion, comprising a.

The method according to claim 4, The large particle classifier is installed on one side of the flow control valve and the horizontal chamber is formed long in the transverse direction; A plurality of large particle partitions mounted in the lateral chamber; A transverse magnet installed surrounding the lower portion of the transverse chamber;

The apparatus of claim 4, wherein the small particle classifier comprises: a longitudinal chamber communicating with the large particle classifier, the longitudinal chamber being elongated in the longitudinal direction; A small particle partition mounted in the center of the vertical chamber; Seed magnets are installed while surrounding the lower portion of the seed chamber;

The magnetic nanoparticles of claim 5 or 6, wherein the large particle compartment or the small particle compartment is installed spaced apart from the inner bottom surface of the transverse chamber or the longitudinal chamber by a predetermined distance. System for classifying and recovering powders.

The system for classifying and recovering magnetic nanopowders produced by electroexplosion in liquids according to claim 5 or 6, wherein the transverse magnets or seed magnets are composed of permanent magnets or electromagnets.