JP2002224586A - Method of selecting fine particle by magnetic selection - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method of selecting a fine particle by magnetic selection at a high recovery ratio of the magnetic material and non-magnetic materials with respectively high qualities after the magnetic selection by evenly dispersion a powder having magnetism in a liquid. SOLUTION: After a powder 23 containing a magnetic substance mainly having an average particle diameter of less than 10 μm is charged into a liquid 24 and dispersed in the liquid 24, magnetic material is magnetically selected from the powder 23 and non-magnetic materials are recovered from the powder 23.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic separation method in which a powder containing a magnetic substance is dispersed in a liquid, and then the magnetic substance dispersed in the liquid is removed by a magnetic separator to recover a non-magnetic substance. The present invention relates to a method for sorting fine particles.

[0002]

2. Description of the Related Art Conventionally, when recovering valuable non-magnetic materials from waste containing magnetic substances, for example, the waste is ground to a predetermined size and an average particle size of, for example, about 10 μm. As described above, by grinding the waste, it is possible to separate the magnetic and non-magnetic substances that are linked to each other. Next, after the pulverized waste is put into water, the magnetic substance in the suspension is magnetically removed using a magnetic separator, and substantially only valuable substances remain in the water. Then, the suspension from which the magnetic substance has been removed is subjected to a dehydration treatment, and moisture attached to valuables that cannot be removed by the dehydration treatment is removed using, for example, a dryer or the like, whereby the dried state is obtained. Collecting valuables. Thereby, many valuables can be collected from the waste, and the quality of the collected valuables can be improved.

[0003]

However, in order to recover more valuable resources from the waste, the average particle size of the waste is pulverized to, for example, less than 10 μm. ), Or when recovering valuable materials from powders in which the waste is liable to be shattered and the average particle size is smaller than, for example, 10 μm, there are the following problems. When powder containing valuables is put into water for magnetic separation, the powder containing the valuables is poorly adapted to water (wettability), so that the powder containing valuables easily aggregates in water to form pseudo particles. . For this reason, since the dispersion of the powder in water becomes insufficient, there is a possibility that the valuable material is magnetically separated while adhering to the magnetic material, and the recovery rate of the valuable material is reduced. In addition, when magnetically separating powder having the above-mentioned particle size, it is necessary to use a magnetic separator having a high magnetic flux density. However, since the powder is not uniformly dispersed in water, valuable materials are used as a magnetic separator. There is a possibility that the magnetic substance is adsorbed at the same time when the magnetic substance is adsorbed (magnetically adhered), and the sorting effect is not high. The present invention has been made in view of the above circumstances, and fine particles by magnetic force sorting to increase the recovery rate and quality of magnetic and non-magnetic materials after magnetic force by uniformly dispersing powder having a magnetic material in a liquid. The purpose of the present invention is to provide a method of sorting.

[0004]

According to the first aspect of the present invention, there is provided a method for sorting fine particles by magnetic force sorting, wherein a powder containing a magnetic substance mainly having an average particle diameter of less than 10 μm is charged into a liquid. After dispersing the powder in the liquid, the magnetic substance is magnetically separated from the powder by a magnetic separator to collect the non-magnetic substance from the powder. In this way, the powder that easily forms an agglomerated state is put into the liquid and the powder is dispersed in the liquid, so that the magnetic substance and the non-magnetic substance particles can be individually present in the liquid. Become. According to a second aspect of the present invention, there is provided a method for sorting fine particles by magnetic force according to the first aspect of the present invention, wherein an ultrasonic wave and / or a jet jet is applied to the powder introduced into the liquid. Cavitation is generated in the liquid to promote dispersion of the powder in the liquid.
As described above, since cavitation occurs in the liquid by applying ultrasonic waves and / or jet jets to the powder charged in the liquid, the magnetic substance and the non-magnetic substance do not aggregate in the liquid. Can be individually present in the liquid.

According to a third aspect of the present invention, there is provided a method of sorting fine particles by magnetic force according to the first and second aspects of the present invention, wherein aeration is performed in a liquid, and Promotes powder dispersion. Here, aeration refers to an operation of blowing air, which is an example of a gas, into a liquid. As described above, by performing aeration, the powder can be uniformly dispersed in the liquid without aggregating the powder in the liquid. According to a fourth aspect of the present invention, there is provided a method for selecting fine particles by magnetic force separation according to the fourth aspect of the present invention, wherein the fine particles introduced into the liquid by an AC magnetic pole are subjected to an AC magnetic field. And promote the dispersion of the powder in the liquid. In this way, by generating an alternating magnetic field in the powder,
Since a stirring action can be added to the powder, the powder can be uniformly dispersed in the liquid without aggregating the powder in the liquid.

According to a fifth aspect of the present invention, there is provided a method for sorting fine particles by magnetic force according to the first to fourth aspects of the present invention, wherein the liquid is heated to a predetermined temperature. Promotes the dispersion of powders inside. In addition,
Here, the predetermined temperature is preferably, for example, about 25 to 60 ° C. As described above, by heating the liquid, the powder can be more uniformly dispersed in the liquid without aggregating the powder in the liquid. According to a sixth aspect of the present invention, there is provided a method for sorting fine particles by magnetic force sorting,
In the method for sorting fine particles by magnetic force sorting according to the fifth invention, using water obtained by adding a water-soluble surfactant to a liquid,
The dispersion of the powder in the liquid is promoted. In addition, it is preferable to use a polycarboxylic acid type anionic surfactant as the water-soluble surfactant. In this way, by using water in which a water-soluble surfactant is added to the liquid, it is possible to maintain a state in which the powder is uniformly dispersed in the liquid without aggregating the powder in the liquid. Becomes

According to a seventh aspect of the present invention, there is provided a method for sorting fine particles by magnetic force sorting according to the first to sixth aspects of the present invention, wherein the magnetic force sorting machine is provided with a magnetic force sorting device having a high magnetic flux density. Machine. As described above, by using the magnetic separator having a high magnetic flux density as the magnetic separator, it is possible to collect more magnetic substances in the powder. The method for sorting fine particles by magnetic force sorting according to the eighth invention according to the above object is the method for sorting fine particles by magnetic force sorting according to the seventh invention, wherein the powder is dispersed in a liquid, The ferromagnetic substance in the powder is removed by a separator, and the magnetic force is further separated by a magnetic separator having a high magnetic flux density to improve the quality of the non-magnetic substance. In this way, by using magnetic separators with different magnetic flux densities and magnetically separating the powder in the liquid, it is possible to first remove only the ferromagnetic material in the powder without removing the magnetic material in the powder at once. , And the remaining magnetic substance in the powder can be further removed.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments of the present invention will be described with reference to the accompanying drawings to provide an understanding of the present invention. Here, FIG. 1 is a process explanatory view of a method of sorting fine particles by magnetic force sorting according to an embodiment of the present invention, and FIG. 2 shows a magnetic force sorting machine of high magnetic flux density applied to the method of sorting fine particles by magnetic force sorting. FIG. 3 is an explanatory view of a structure, and FIG. 3 is an explanatory view of a magnetic pole portion of a magnetic flux separator having a high magnetic flux density applied to a method of sorting fine particles by the same magnetic force sorting.

A description will be given of a magnetic force separator 10 having a high magnetic flux density applied to a method of sorting fine particles by magnetic force separation according to an embodiment of the present invention. As shown in FIG. 2 and FIG. 3, the magnetic force separator 10 having a high magnetic flux density magnetically separates the powder containing the magnetic substance in the liquid, collects and removes the magnetic substance in the powder, and removes the non-magnetic substance. This is for producing a remaining liquid, for example, 2.5 to 3.
It is a magnetic separator with a high magnetic flux density of about 0 Tesla. Less than,
explain in detail.

The magnetic separator 10 having a high magnetic flux density is provided with an iron ball 22 inside the tube 11 in order to recover a magnetic substance from a suspension (a liquid into which a powder containing a magnetic substance is charged). A magnetic pole part 12 provided with a coil 20 for magnetizing an iron ball 22 around the raw material supply part 13 and a raw material supply part 13 and a separated product discharge part 14 provided on the upstream and downstream sides of the tube 11 except for the magnetic pole part 12, respectively. Have. The raw material supply section 13 is provided with a raw material supply pipe 15 for sending the suspension to the magnetic pole section 12, while the separated product discharge section 14 is provided with the suspension from which the magnetic substance has been collected and removed by the magnetic pole section 12. Separated product discharge pipes 16 to be discharged are provided respectively. The raw material supply unit 13 includes a magnetic pole unit 12.
Discharge tube 1 for discharging the magnetic material collected and removed
On the other hand, a residue discharge pipe 18 for discharging powder (hereinafter, also referred to as residue) remaining inside the magnetic pole portion 12 and in the separation product discharge section 14 and the like is arranged in the separated product discharge section 14, respectively. Has been established.

Then, the raw material supply section 13 and the separated product discharge section 1
4 is provided with a flush water supply pipe 19 for flushing water so that the magnetic substance and the residue can flow to the magnetic substance discharge pipe 17 and the residue discharge pipe 18, respectively, with the same base point. It is arranged. In this way, a suspension is formed again based on the residue collected from the residue discharge pipe 18, and the suspension is supplied from the raw material supply pipe 15 to the magnetic pole part 12 having a liquid passing space in which a magnetic field is formed. By sending water, it becomes possible to further increase the recovery rate of non-magnetic substances from the powder. In addition, it is also possible to blow air into the water pipe 19 for washing water instead of washing water. Also, since the raw material supply pipe 15, the separated product discharge pipe 16, the magnetic substance discharge pipe 17, the residue discharge pipe 18, and the washing water supply pipe 19 are provided with valves (not shown), only necessary pipes are provided. It is possible to feed the liquid. And the magnetic pole part 12 is, as described above,
A coil 20 surrounding the tube 11 is provided. Further, the inside of the tube 11 is filled with a large number of iron balls 22, and a direct current is applied to the coil 20 so that a large number of iron balls filled in the tube 11 of the magnetic pole portion 12. The magnet 22 is magnetized to form a liquid-permeable magnetic space in a gap between the adjacent iron balls 22.

Next, the above-described high-magnetic-flux-density magnetic separator 1
The operation method of 0 will be described. First, the suspension is supplied to a raw material supply pipe 15 by, for example, a mineral feed pump (not shown).
More water is sent to the magnetic pole portion 12. At this time, by supplying a direct current to the coil 20 of the magnetic pole portion 12 in advance, the plurality of iron balls 22
Is magnetized, the magnetic substance in the suspension fed to the magnetic pole portion 12 is magnetically attached (adsorbed) to the plurality of iron balls 22, and the magnetic substance is removed from the suspension. The suspension from which the magnetic substances have been removed is discharged from the fractionated product discharge pipe 16 and collected (see the solid line in FIG. 2).

After the above operation is completed, the raw material supply unit 1
Water, which is an example of washing water, is flowed into the washing water supply pipe 19 provided in 3, and the residue remaining inside the magnetic pole section 12 and the separated product discharge section 14 is discharged from the residue discharge pipe 18 together with the water. . At this time, since a DC current continues to flow through the coil 20 of the magnetic pole portion 12, the magnetic substance magnetically attached to the plurality of iron balls 22 maintains the state of being magnetically attached to the plurality of iron balls 22 (in FIG. 2). 2). After the residue is discharged from the residue discharge pipe 18, the DC current continuously flowing to the coil 20 of the magnetic pole part 12 is stopped for a certain time, and the plurality of iron balls 22 are demagnetized. afterwards,
Water is flowed into the washing water supply pipe 19 provided in the separated product discharge section 14, and the magnetic substance magnetically attached to the iron ball is discharged from the magnetic substance discharge pipe 17 together with the water (see the dotted line in FIG. 2). ).

Next, a method for sorting fine particles by magnetic force sorting according to an embodiment of the present invention will be described using the magnetic force sorting machine 10 having a high magnetic flux density described above. As shown in FIG.
In the method for sorting fine particles by magnetic force sorting according to one embodiment of the present invention, a powder containing a stainless material as an example of a magnetic substance having an average particle diameter of less than 10 μm (in this embodiment, lead oxide, A silica (stainless steel material) is charged into a liquid (in this embodiment, water to which a polycarboxylic acid-type anionic surfactant, which is an example of a water-soluble surfactant), is added. After the powder 23 is dispersed in the magnetic material, a high magnetic flux density magnetic force
Magnetic separation of stainless steel from powder 23 by 0
This is a method of recovering a lead glass raw material (for example, lead oxide, silica, etc.) 25 which is an example of a nonmagnetic substance from the powder 23. The details will be described below.

First, a powder 23 containing a stainless steel having an average particle diameter of less than 10 μm (in this embodiment, for example, about 2 to 3 μm) is mixed with a polycarboxylic acid type anionic surfactant (hereinafter referred to as a surfactant). ) Is added to the liquid 24 to which the agent 24 has been added. Here, the average particle size of the powder 23 is less than 10 μm, but is preferably less than 7 μm, and more preferably less than 5 μm. In addition, as for the surfactant, the surfactant is 3
About 0 to 60% by weight (in this embodiment, 43% by weight
Approximately), and the remainder is made into an aqueous solution 26 of a surfactant composed of water before use. Therefore, the aqueous solution 26 of this surfactant is used.
Is added, for example, to water in an amount of about 0.1 to 5% by weight (about 1% by weight in this embodiment) to form a liquid 24. Next, ultrasonic waves are applied to the powder 23 charged in the liquid 24 for about 1 hour using an ultrasonic device to generate cavitation in the liquid 24 to promote dispersion of the powder 23 in the liquid 24. At the same time, the liquid 24 is heated to a predetermined temperature, for example, 25 to 60.
℃ (about 40 ℃ in this embodiment),
The dispersion of the powder 23 in the liquid 24 is further promoted.

This can be carried out by using a conventionally known method, for example, 0.05 to 0.1.
Using a magnetic separator 27 having a low magnetic flux density of about 3 Tesla (0.15 Tesla in this embodiment), a ferromagnetic stainless steel material 2 among the stainless steel materials contained in the liquid 24 is used.
Remove only 8 The liquid 29 from which the ferromagnetic stainless material 28 has been removed is further subjected to magnetic separation using the above-described magnetic flux separator 10 having a high magnetic flux density, so that the liquid 29 remaining in the liquid 29 from which the ferromagnetic stainless material 28 has been removed is removed. A liquid 31 containing a lead glass raw material 25 from which a stainless steel material to be removed, for example, a stainless steel material 30 of a weak magnetic material is removed. Thus, first, using the magnetic separator 27 having a low magnetic flux density, only the ferromagnetic stainless steel material 28 in the stainless steel material in the liquid 24 is removed,
Further, by using a magnetic flux separator 10 having a high magnetic flux density to remove the stainless steel material 30 such as a weak magnetic material from the liquid 29 from which the stainless steel material 28 having the ferromagnetic material has been removed, the magnetic force separator 10 having a high magnetic flux density can be used. Simultaneous adsorption (roll-in) of the lead glass raw material 25 at the time of magnetic substance adsorption can be reduced, and the quality and yield of each of the stainless steel material and the lead glass raw material 25 after magnetic force separation can be improved. Liquid 3 containing this lead glass raw material 25
1 is dehydrated using, for example, filtration or a centrifuge,
After recovering the lead glass raw material 25 to which a small amount of water has adhered,
This is dried using, for example, a dryer or the like, and the lead glass material 25 in a dry state is recovered.

[0017]

EXAMPLES The results of a test performed by applying the method for sorting fine particles by magnetic force sorting according to the present invention will be described. In addition, in Invention Examples 1-3 and Comparative Examples 1 and 2, the average particle size was 2 to 2.
A test is conducted using a suspension in which a powder containing stainless steel mainly composed of 3 μm (92% by weight of the powder is a raw material of lead glass) is put into water at about 1 to 30% by weight. Table 1 shows the results.

[0018]

[Table 1]

The yield of the nonmagnetic material indicates the percentage of the weight of the lead glass raw material recovered with respect to the weight of the powder charged in water, and the recovery rate is based on the total weight of the lead glass raw material contained in the powder. The percentage of the weight of the recovered lead glass raw material is shown. The quality was measured using a 2.0 Tesla magnetic flux density tester, and the magnetic substance remaining in the liquid after the magnetic separation was magnetically adhered to the magnetic part of the tester, and the magnetic substance was visually checked. , The case where the amount was confirmed even in a very small amount is indicated by x, and the case where no amount was confirmed was indicated by ○.

In Inventive Example 1, a powder was put into water in which an aqueous solution of a surfactant was added at 1% by weight with respect to water, and water was added to the powder to about 40 ° C. while applying ultrasonic waves for about 1 hour. Using a suspension that warms and promotes the dispersion of the powder in water,
After performing a magnetic separation by a magnetic separator having a low magnetic flux density of 0.15 Tesla, a magnetic separator is further performed by a magnetic separator having a high magnetic flux density of 2.8 Tesla. In this case, the yield of the nonmagnetic material was 91.98% by weight, and the recovery rate of the lead glass raw material was 99.98% by weight, indicating that almost all of the lead glass in the powder could be recovered. In addition, even in the test using the tester, the magnetic adhesion of the stainless steel material to the magnetically bonded portion could not be confirmed. Inventive Example 2 is a method in which a powder is put into water to which a surfactant is not added, and the powder is heated to about 40 ° C. while applying ultrasonic waves to the powder for about 1 hour to disperse the powder in water. Using the suspension that promoted the above, the magnetic force was sorted by a magnetic force sorter having a low magnetic flux density of 0.15 Tesla, and then the magnetic force was sorted by a magnetic force sorter having a high magnetic flux density of 2.8 Tesla. I have. In this case, the recovery rate of the lead glass raw material is 8
The recovery rate was 5.23% by weight, and the recovery rate was lower than that of Inventive Example 1. However, no magnetic adhesion of the stainless steel to the magnetically bonded portion was confirmed by the test using the tester. Therefore, since the quality of the recovered lead glass raw material is high, there is no problem in reusing the recovered lead glass raw material.

Inventive Example 3 is a method in which a powder is charged into water to which no surfactant is added, and the powder charged into the water without heating the water is irradiated with ultrasonic waves for about one hour, and the powder in the water is heated. Using a suspension that promotes dispersion of the body, a magnetic force is sorted by a magnetic force sorter with a low magnetic flux density of 0.15 Tesla, and then a magnetic force sorter with a magnetic force sorter with a high magnetic flux density of 2.8 Tesla. It is carried out. In this case, the recovery rate of the lead glass raw material is 6
It was 2.13% by weight, and the recovery rate was further reduced as compared with Inventive Example 1. However, in the test performed by the tester, the magnetic adhesion of the stainless steel to the magnetically bonded portion could not be confirmed. Therefore, since the quality of the recovered lead glass raw material is high, there is no problem in reusing the recovered lead glass raw material.

Comparative Example 1 uses a magnetic separator having a low magnetic flux density of 0.15 Tesla using the above-mentioned suspension in which the powder was merely introduced into water without dispersing the powder in the liquid. After performing magnetic force sorting, magnetic force sorting is further performed by a magnetic force sorting machine having a high magnetic flux density of 2.8 Tesla. In this case, the recovery rate of the lead glass raw material was 50.25% by weight, and the recovery rate was further reduced as compared with Inventive Example 3. Further, even in the test using the tester, the magnetic adhesion of the stainless steel to the magnetically bonded portion was suppressed. confirmed. This is due to magnetic separation in a state where the stainless steel material and the lead glass raw material are aggregated, and there is a problem in reusing the recovered lead glass raw material because the quality of the recovered lead glass raw material is low. .

In Comparative Example 2, a magnetic force sorter having a high magnetic flux density of 2.8 Tesla was used by using the above-mentioned suspension in which the powder was merely introduced into water without dispersing the powder in the liquid. Only magnetic force sorting is performed. In this case, the recovery rate of the lead glass raw material was 37.82% by weight, the recovery rate was lower than that of Comparative Example 1, and the magnetic adhesion of the stainless steel to the magnetically bonded portion was confirmed by the test using the tester. Was done. This is because the suspension in which the powder is not dispersed in water is subjected to magnetic separation by a magnetic separator, thereby simultaneously adsorbing lead glass raw materials during magnetic substance adsorption by a magnetic separator having a high magnetic flux density. ) Occurred. From the above, as in Invention Examples 1 to 3, after promoting the dispersion of the powder in water, the magnetic force is sorted by a magnetic force sorter so that the lead glass material is simultaneously adsorbed when the magnetic material is adsorbed by the magnetic force sorter. Adsorption can be reduced, and the quality and yield of each of the stainless steel material and the lead glass raw material after magnetic force separation can be improved.

As described above, the present invention has been described with reference to an embodiment. However, the present invention is not limited to the configuration described in the above embodiment, and is described in the claims. It also includes other embodiments and modifications that can be considered within the scope of the matters described. For example, in the above-described embodiment, the case where water in which a surfactant is added to a liquid is used, but other liquids can be used as long as the dispersion state of the powder in the liquid can be improved. alcohol,
It is also possible to use kerosene, gasoline, other organic solvents and the like. In the above-described embodiment, the suspension is prepared by charging a powder into water to which a surfactant is added, heating the powder while applying ultrasonic waves to the powder, and dispersing the powder in water. A case was described in which a suspension was prepared, and magnetic separation was performed using this suspension. However, a jet jet is applied to the powder charged in the water, causing cavitation in the water,
It is possible to promote the dispersion of powder in water, or to apply sonication and jet jet to the powder put in water to generate cavitation in water and promote the dispersion of powder in water. is there. Then, it is also possible to perform aeration in water to promote dispersion of the powder in water. Further, for example, an AC magnetic pole is arranged in a flow path of the liquid into which the powder is charged, and an AC magnetic field is generated in the powder charged into the liquid by the AC magnetic pole, thereby adding a stirring action to the powder, and It is also possible to promote the dispersion of the powder in the process.

In consideration of the components of the powder, the processing cost, etc., addition of a surfactant, heating, ultrasonic wave, jet jet,
Either aeration or the use of alternating magnetic poles 1 or 2
After performing the above and promoting the dispersion of the powder in water, it is also possible to perform magnetic separation by a magnetic separator. And in the said embodiment, the case where two magnetic separators of the magnetic separator of low magnetic flux density and the magnetic separator of high magnetic flux density were used was shown, However, three or more magnetic separators were used. It is possible to perform magnetic force sorting, or to perform magnetic force sorting a plurality of times by the same magnetic force sorting machine. Further, in the above-described embodiment, the non-magnetic material is shown as a valuable material. However, the magnetic material may be a valuable material, or both the non-magnetic material and the magnetic material may be a valuable material.

[0026]

According to the method for sorting fine particles by magnetic force sorting according to the first to eighth aspects of the present invention, powder which easily forms an agglomerated state is put into a liquid, and the powder is dispersed in the liquid. In this case, particles of a magnetic substance and particles of a non-magnetic substance can be separately present. This can reduce the incorporation of non-magnetic substances into the magnetic substances collected at the time of magnetic separation, and thus can increase the recovery rate and quality of the non-magnetic substances after magnetic separation. Therefore, it is possible to provide a method for sorting fine particles by magnetic force sorting, which has good workability and economy. In particular, claim 2
In the method for sorting fine particles by magnetic force described in the described method, cavitation occurs in the liquid by applying ultrasonic waves and / or jet jet to the powder charged in the liquid,
The particles of the magnetic substance and the non-magnetic substance can be individually present in the liquid without aggregating the powder in the liquid. Therefore, since the powder can be easily dispersed in the liquid,
It is possible to provide a method of sorting fine particles by magnetic force sorting with good workability.

According to the third aspect of the present invention, by performing aeration, it is possible to uniformly disperse the powder in the liquid without aggregating the powder in the liquid. . Therefore, since the powder can be easily dispersed in the liquid, it is possible to provide a method of sorting fine particles by magnetic force sorting with better workability. In the method for sorting fine particles by magnetic force sorting according to claim 4, by generating an alternating magnetic field in the powder, it is possible to add a stirring action to the powder, without aggregating the powder in the liquid, The powder can be uniformly dispersed in the liquid. Therefore, since the powder can be easily dispersed in the liquid, it is possible to provide a method of sorting fine particles by magnetic force sorting with better workability.

[0028] In the method for sorting fine particles by magnetic force sorting according to the fifth aspect, the powder can be more uniformly dispersed in the liquid by heating the liquid without causing the powder to agglomerate in the liquid. It becomes possible. Therefore, since the powder can be easily dispersed in the liquid, it is possible to provide a method for selecting fine particles by magnetic force selection, which has better workability.
In the method for sorting fine particles by magnetic force sorting according to the sixth aspect, it is possible to maintain a state in which the powder is uniformly dispersed in the liquid without aggregating the powder in the liquid. Therefore, it is possible to maintain a state in which the powder is uniformly dispersed in the liquid without aggregating the powder in the liquid, thereby improving the recovery rate and the quality of the non-magnetic material after the magnetic separation. Becomes possible.

In the method for separating fine particles by magnetic force sorting according to the seventh aspect, by using a magnetic force sorting machine having a high magnetic flux density for the magnetic force sorting machine, it is possible to collect more magnetic substances in the powder. . Accordingly, the recovery rate of each of the magnetic substance and the non-magnetic substance in the powder can be increased, so that it is possible to provide a method for sorting fine particles by magnetic force sorting, which is economically favorable. In the method for sorting fine particles by magnetic force sorting according to claim 8, by using a magnetic force sorting machine having a different magnetic flux density and magnetically sorting the powder in the liquid without removing the magnetic substance in the powder at once. First, only the ferromagnetic substance in the powder can be removed, and the remaining magnetic substance in the powder can be further removed. As a result, the magnetic substance contained in the liquid can be reduced stepwise, so that it is possible to reduce the amount of non-magnetic substances that are caught in the magnetic substance magnetically attached to the magnetic separator and removed together with the magnetic substance. It becomes possible. Therefore,
Since the respective recovery rates of the magnetic substance and the non-magnetic substance in the powder can be further increased, it is possible to provide a method for sorting fine particles by magnetic force sorting which is economically favorable.

[Brief description of the drawings]

FIG. 1 is a process explanatory view of a method for sorting fine particles by magnetic force sorting according to an embodiment of the present invention.

FIG. 2 is an explanatory diagram of a structure of a magnetic flux separator having a high magnetic flux density applied to a method of sorting fine particles by the same magnetic force sorting.

FIG. 3 is an explanatory view of a magnetic pole portion of a magnetic force separator having a high magnetic flux density applied to a method for sorting fine particles by the same magnetic force sorting.

[Description of Signs] 10: High magnetic flux density magnetic separator (magnetic separator), 11:
Tube, 12: magnetic pole portion, 13: raw material supply portion, 14: separated product discharge portion, 15: raw material supply tube, 16: separated product discharge tube, 17:
Magnetic substance discharge pipe, 18: residue discharge pipe, 19: water supply pipe for washing water, 20: coil, 22: iron ball, 23: powder, 24:
Liquid, 25: Lead glass raw material (non-magnetic substance), 26: Surfactant aqueous solution, 27: Low magnetic flux density magnetic separator, 28: Ferromagnetic stainless steel, 29: Ferromagnetic stainless steel removed Liquid, 30: weak magnetic stainless steel, 31:
Liquid containing lead glass raw material

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) B02C 19/18 B02C 19/18 E 23/06 23/06 23/08 23/08 Z B03C 1/02 B03C 1/02 Z

Claims (8)

[Claims] 1. A powder containing a magnetic substance mainly having an average particle diameter of less than 10 μm is charged into a liquid, and the powder is dispersed in the liquid. Then, the powder is dispersed from the powder by a magnetic separator. A method for sorting fine particles by magnetic force sorting, wherein a magnetic material is magnetically separated and a non-magnetic material is recovered from the powder. 2. The method for sorting fine particles by magnetic force sorting according to claim 1, wherein said powder introduced into said liquid is subjected to ultrasonic and / or jet jet to generate cavitation in said liquid, A method for sorting fine particles by magnetic force sorting, wherein the dispersion of the powder in a liquid is promoted. 3. The method for sorting fine particles by magnetic force sorting according to claim 1, wherein aeration is performed in the liquid to promote dispersion of the powder in the liquid. A method for sorting fine particles. 4. The method for sorting fine particles by magnetic force sorting according to any one of claims 1 to 3, wherein an AC magnetic pole generates an AC magnetic field in the powder introduced into the liquid.
A method of sorting fine particles by magnetic force sorting, wherein the dispersion of the powder in the liquid is promoted. 5. The method for sorting fine particles by magnetic force sorting according to claim 1, wherein the liquid is heated to a predetermined temperature to promote dispersion of the powder in the liquid. A method for sorting fine particles by magnetic force sorting. 6. The method for sorting fine particles by magnetic force sorting according to any one of claims 1 to 5, wherein water obtained by adding a water-soluble surfactant to the liquid is used. A method for sorting fine particles by magnetic force sorting, which promotes dispersion of powder. 7. The method for sorting fine particles by magnetic force sorting according to claim 1, wherein a magnetic force sorting machine having a high magnetic flux density is used as the magnetic force sorting machine. Sorting method. 8. The method for sorting fine particles by magnetic force sorting according to claim 7, wherein after dispersing the powder in the liquid, a ferromagnetic substance in the powder is removed by a magnetic force sorting machine having a low magnetic flux density. And a magnetic force sorting device that performs a magnetic force sorting with the magnetic force sorting machine having a high magnetic flux density to enhance the quality of the non-magnetic material.