JP2002102731A - Pulverizer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pulverizer capable of mass-producing a finely pulverized powdery material which is able to meet advanced quality characteristics required in electronic material-related fields, at a low cost. SOLUTION: In this pulverizer, as materials of a part liable to be statically worn and a part liable to be dynamically worn, different kinds of ceramic materials from each other are used, respectively.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to various industrial fields such as magnetic recording materials, electronic materials, chemicals, paints, pigments, cosmetic powders, foods, feeds, and fertilizers by crushing, mixing and dispersing raw materials. The present invention relates to a pulverizer for processing into a finely pulverized powder material to be used.

[0002]

2. Description of the Related Art A ceramic material such as alumina is often used as a member of a pulverizer for pulverizing a crude material into a powder material, since the material is excellent in abrasion resistance as compared with metal, but inexpensive. .

[0003] However, such ceramic materials are liable to be abraded when the raw material is crushed, and as the characteristics required for finely pulverized powder materials such as liquid crystal pigments used in the field of electronic materials increase, the fine particles generated by the abrasion become finer. The problem that the powder is mixed in the product and deteriorates the properties of the obtained electronic material and the like has become apparent.

[0004]

SUMMARY OF THE INVENTION An object of the present invention is to provide a pulverizer for producing a finely pulverized powder material which satisfies a high quality characteristic required in, for example, an electronic material-related field at a low cost and in a large amount. It is in.

[0005]

In order to achieve the above object, the present invention has the following arrangement. That is, a dynamic wear portion,
This is a crusher in which different types of ceramic materials are used for the static wear part.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION A crusher according to the present invention is one in which a ceramic material is used for a dynamic wear portion and a static wear portion.

[0007] The term "dynamic wear portion" as used herein refers to a portion, such as a medium or a stirring disk, which has the function of pulverizing a raw material by rotating and dispersing inside a pulverizer. `` Static wear part '' means, for example, a vessel, such as a vessel and an end # plate, inside the crusher, which does not perform any operation or the like, cooperates with the dynamic wear part, and has a function of pulverizing the raw material. Say.

Further, in the crusher of the present invention, different types of ceramic materials are used for the dynamic wear portion and the static wear portion.

When the same kind of ceramic material, for example, alumina / zirconia composite material (hereinafter referred to as ZTA), silicon nitride, SiC, alumina, and tetragonal zirconia are used for the dynamic wear portion and the static wear portion, the vessel becomes Heat is stored, and the quality of the powder material obtained may be reduced, the wear resistance of the vessel or end plate may be insufficient, and the frequency of replacement of the members may increase.

As a specific example of the ceramic material used for the dynamic wear portion, tetragonal zirconia is cited because it has a large impact force (crushing force) per unit area and is excellent in wear resistance.

Here, tetragonal zirconia is JIS R1
The bending strength according to 601 is 80 to 150 kgf / mm ² ,
It is preferably 100 to 130 kgf / mm ² and has a Vickers hardness of 120 according to JIS R1610.
0 to 1400 kgf / mm ² , preferably 1250 to 1
It is particularly preferable to use a material having a high strength of 350 kgf / mm ² . Outside of this range, wear resistance may be insufficient.

Further, as the tetragonal zirconia, since the pulverizing efficiency of the pulverizer is enhanced, the solution-solved Y ₂ O ₃ is used as 1.
It is good to use those having 5 to 5 mol%, preferably 2 to 4 mol%, and having an average particle diameter of 0.05 to 2 μm, preferably 0.1 to 1 μm.

On the other hand, in the present invention, it is preferable that at least one kind of ceramic material selected from the group consisting of ZTA, silicon nitride, SiC and alumina is used for the static friction portion.

Here, the ZTA has a bending strength according to JIS R1601 of 50 to 90 kgf / mm ² , preferably 6
0 to 80 kgf / mm ² and JIS R161
A material having excellent abrasion resistance having a hardness of 0 to 1600 to 1800 kgf / mm ² , preferably 1650 to 1750 kgf / mm ² is good.

[0015] From this point of view, ZTA is 50% alumina.
-90% by weight, preferably 60-85% by weight, and 5%
A composition in which the crystal structure of 0% by volume or more, preferably 70% by volume or more is a tetragonal crystal is good.

The alumina constituting ZTA has an average particle diameter of 0.2 to 5 μm, preferably 0.5 to 3 μm.
zirconia constituting ZTA has an average particle diameter of 0.2 to 2 μm, preferably 0.3 to 1 μm, while maintaining the excellent thermal conductivity of alumina, This is desirable because a high bending strength is developed in the wear portion.

Silicon nitride is a tune according to JIS R1601.
Strength is 60-100kgf / mm ^Two, Preferably 70
~ 90kgf / mm^TwoAccording to JIS R1610
Vickers hardness is 1200 to 1700 kgf / m
m^TwoAnd preferably 1400 to 1600. Or
If it is out of this range, it will not be possible to obtain insufficient wear resistance
Sometimes.

SiC has a flexural strength according to JIS R1601 of 40 to 80 kgf / mm ^2, preferably 50 to 70 kgf / mm ^2.
a kgf / mm ^2, the Vickers hardness in JIS R1610 is 1800~2500kgf / mm ² and preferably from those 2000~2300kgf / mm ^2.
Here, SiC includes SiSiC.

The alumina has a Vickers hardness according to JIS R1610 of 1600 to 2000 kgf / mm.
² , preferably 1700 to 1900 kgf / mm ²
However, those having excellent wear resistance are preferred. However, alumina is
Bending strength according to JIS R1601 is usually 50 kgf /
Since it is about ² mm2, which is somewhat inferior to other ceramic materials, it can be suitably used for relatively small members such as sleeves and collars.

The crusher according to the present invention will be described below with reference to the drawings.

FIG. 1 is a schematic diagram showing one embodiment of a pulverizer according to the present invention. Here, vessel 9, end plate 1
0, made of ZTA, media 12, stirring disk 1
1 is made of high-strength tetragonal zirconia.

In the present invention, the vessel has an inner diameter of 50.
1 to 1000 mm and a length of 50 to 2000 mm can be preferably used (the vessel 9 shown in FIG.
mm and a length of 680 mm).

In the present invention, the end plate preferably has a thickness of 5 to 20 mm and a diameter of 50 to 1000 mm (the end plate 10 shown in FIG. 1 has a thickness of 12 mm and a diameter of 380 mm).

FIG. 2 shows a stirring mechanism of the pulverizer according to the present invention. As described above, the stirring mechanism is usually provided with the stirring disk 7.
And the collar 8 are alternately stacked. Further, it is preferable that these members are fixed by being screwed in the longitudinal direction with screws.

In the present invention, a stirring disk having a diameter of 50 to 400 mm and a thickness of 3 to 20 mm can be preferably used (the stirring disk 7 shown in FIG.
mm and a thickness of 14 mm).

FIG. 3 shows a fitting assembly of the stirring shaft and the stirring disk of the crusher according to the present invention. Thus, in order to reduce stress concentration, it is preferable to provide the rounded key groove 6. In FIG. 3, three balance holes 2 are provided. However, the present invention is not limited to this. The balance holes 2 are provided to reduce the weight of the stirring disk.
It is preferable to provide up to 6, preferably 3 to 5. Further, as shown in FIG. 3, it is preferable to provide the slope portion 3 in the rotation direction. Thereby, the dispersion motion of the medium is activated, and the stirring efficiency is improved. Further, as shown in FIG. 3, the pin 4 is preferably integrated with the main body.
As a result, appropriate resistance to repeated impact loads received from the media can be provided.

FIG. 4 shows a stirring disk (windmill type) usable in the present invention. This disk has a circumferential groove 5 instead of the balance hole 2 in the stirring disk shown in FIG.

FIG. 5 shows a stirring disk (wheel type) usable in the present invention. This disc has a slope 3
And a pin 4. Thereby, the stirring efficiency is increased.

In the present invention, the media 12 includes:
It is good to use one having a diameter of 0.1 to 5 mm, preferably 0.3 to 3 mm. If it is less than 0.1 mm, the powder material obtained by powdering may be overdispersed,
If it exceeds 5 mm, the material may be coarsely dispersed.
Further, in order to further increase the pulverization efficiency, it is preferable that the media have a surface roughness of 0.8 S or less and a uniform particle diameter with a tolerance of ± 0.05 mm or less for the upper and lower limits of the particle diameter.

Hereinafter, an example of a method of using the pulverizer of the present invention will be described.

For example, using a pulverizer shown in FIG. 1, the stirring disk 11 is set at 100 to 4000 rpm, preferably 5 rpm.
Rotate in the range of 00 to 1500 rpm. As a result, a collision shear force is applied to the medium 12, and the raw material previously charged in the pulverizer is pulverized and pulverized, and further mixed with water or the like supplied from outside the pulverizer to form a slurry liquid. You can also.

Here, the filling amount of the medium 12 is set to 60 to 90% by volume, preferably 70 to 80% by volume of the nominal volume of the vessel in order to increase the stirring efficiency.

The stirring disk is preferably operated at a peripheral speed of 7 to 9 m / sec at the outer peripheral portion. However, in the case where the pulverization efficiency is further increased and the obtained powder material is pulverized, the above-mentioned method is used. It is preferable to operate with a peripheral speed in the range of 11 to 20 m / sec.

[0034]

The present invention will be described more specifically with reference to the following examples.

Titanium oxide slurry (particle size: 0.5 to 2 μm), which is generally used as a pigment powder for polyester synthetic fibers, was produced by pulverizing and dispersing a crude material with a pulverizer shown in FIG.

The above operation was performed for about one year, and the operation time was reduced to three.
As a result of operating for 000 to 5,000 hours, little wear was observed on the vessel and the like, and the durability was markedly superior to that of a conventional pulverizer using alumina or metal for the vessel.

The lower limit diameter of the medium is 0.2.
After sorting with a 5 mm wire mesh, about 2/3 of the total amount was not required to be replaced. According to the conventional pulverizer using alumina or metal for the medium, it was necessary to replace the entire amount in the above use condition. The result was much better than that.

[0038]

According to the present invention, it is possible to provide a pulverizer for producing a large amount of finely pulverized powder material satisfying, for example, a high quality characteristic required in the field of electronic materials at low cost.

[Brief description of the drawings]

FIG. 1 is a schematic view showing one embodiment of a crusher according to the present invention.

FIG. 2 shows an example of a stirring mechanism of a pulverizer according to the present invention.

FIG. 3 is a view showing an example of a stirring disk (wheel type).

FIG. 4 is a view showing an example of a stirring disk (windmill type).

FIG. 5 is a view showing another example of a stirring disk (wheel type).

[Explanation of symbols]

 1: Shaft hole (square) 2: Balance hole 3: Slope part 4: Pin 5: Circular groove 6: Key groove 7: Stirring disk 8: Collar 9: Vessel 10: End plate 11: Stirring mechanism 12: Media 13: Screen (cylindrical)

Claims (2)

[Claims] 1. A pulverizer in which different types of ceramic materials are used for a dynamic wear portion and a static wear portion. 2. A dynamic wear portion comprising tetragonal zirconia, and a static wear portion comprising at least one ceramic material selected from the group consisting of alumina-zirconia composite material, SiC, and silicon nitride. The crusher according to claim 1, which is used.