JPS6411340B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a method and apparatus for pulverizing solid materials, and particularly to a method and apparatus for pulverizing solid materials by wet pulverization.

[Prior Art] Conventionally, methods for finely pulverizing solid materials such as ceramics, paints, inks, minerals, and chemical materials include:
A medium agitation pulverizer using wet pulverization is used.

A medium-stirring pulverizer uses continuous or batch operation to move the pulverizing medium, such as fine balls, filled in a pulverizing container by rotating a stirring member, while turning the pulverized material into a slurry. After adjustment, the material is supplied to a grinding container using a pump or the like, and is pulverized under the action of pressure and friction between the surfaces of a group of moving grinding media.

The term "grinding material" here means the material used for the grinding operation.

The shape of the grinding container of the medium agitation fine grinder is as follows:
Mainly cylindrical or conical shapes are used,
In addition, it is used by arranging it vertically or horizontally. Further, the stirring member has a shape such as a disk, a rod, a spiral plate, a screw, etc., and is attached to a central shaft, and the stirring member moves the grinding media under the rotation of the central shaft. The crushing container is moved in multiple directions, such as circumferentially, axially, and obliquely.

A single medium agitation pulverizer is used depending on the purpose of pulverization as well as the properties of the product and the pulverized material, especially when pulverization to a size of several μm is required. Fine pulverization has been carried out either by batchwise operation using a pulverizer or by continuous operation by arranging a plurality of medium agitation pulverizers in series to increase the residence time. In the above case, as the pulverization progresses, the slurry-like pulverized material and pulverized products are separated from the pulverizing media using a classifier, etc., and then supplied to the next medium-stirring pulverizer. Fine pulverization was progressed one after another, and a slurry-like product was discharged from the final medium agitation pulverizer. (For example, B.
Heinrick, Kreitner L.: Aufbereitungs−
(See Technik 11, (1981), 619, etc.) In addition, in a media agitation pulverizer arranged vertically or horizontally, the pulverizing container is divided into multiple pulverizing chambers, and the pulverizing medium filled in each pulverizing chamber is were each moved by a stirring member, the grinding material was supplied from one end of the grinding container, pulverization progressed sequentially within the grinding chamber, and a slurry-like product was discharged from the other end. (For example, Japanese Patent Application Laid-Open No. 59-147651, Japanese Patent Publication No. 59-46665, etc.) [Problems to be Solved by the Invention] However, in the above-mentioned conventional method and apparatus for pulverizing solid materials, a plurality of pulverizing chambers are required. Even if you use a stirring medium pulverizer made of Therefore, there was a problem in that the pulverization conditions, including the peripheral speed of the stirring member, could not be appropriately adjusted. In addition, regarding the classification effect when separating the slurry-like pulverized product from the pulverizing media,
There has been a problem that only gravity is applied to the classification surface, and no additional operating force such as centrifugal force is applied, so that a sufficient classification action is not performed.

All of the above-mentioned problems hinder the achievement of fine pulverization down to several micrometers, which is an issue in the pulverization method and equipment for solid materials. When replacing the machine due to wear and tear, there was a problem in that it was extremely difficult to pull it out of the machine as a whole from the central shaft and replace it.

The present invention solves such conventional problems, and the crushed material is supplied to the crushing chamber, and is sequentially moved, so that as pulverization progresses in each crushing chamber, it corresponds to the circumferential speed of the stirring member. Fine pulverization is carried out using a pulverizing means that provides the optimum pulverizing conditions, improves the classification action, and facilitates the replacement of consumable parts, making it possible to achieve pulverization down to several μm. The present invention provides an excellent method and apparatus for pulverizing solid materials.

[Means for Solving the Problems] In order to achieve the above-mentioned object, the present invention agitates and pulverizes the pulverizing media in a plurality of concentrically partitioned pulverizing chambers using a plurality of stirring members rotating about a central axis. The material is pulverized by being sequentially moved from the pulverizing chamber on the outer periphery to the pulverizing chamber in the center under downward and upward flow. The grinding chamber is divided into a plurality of concentric grinding chambers, the grinding chamber is filled with grinding media, and the rotary cylinder is equipped with a stirring member to make it rotatable, so that the crushed material can be moved downwardly and upwardly. A passage is provided through which fine pulverization is carried out sequentially from the pulverizing chamber at the outer periphery to the pulverizing chamber at the center.

[Function] The present invention has the following effects due to the above configuration. That is, the crushed material is supplied to the crushing chamber at the outer periphery, and under the intense stirring of the crushing media accompanying the rotation of the stirring member, the slurry-like crushed material exhibits a locally agglomerated state in the downward flow. Fine pulverization progresses by dispersing the pulverized material in a liquid and by applying pressure and friction to the pulverized material as a result of the movement of the grinding media. Subsequently, the flow moves upward to the grinding chamber adjacent to the grinding chamber, and the grinding medium fills the gap between the rotating grinding chamber wall and the concentric non-rotating compartment wall. Rapid pulverization of the pulverized product is progressed under intense motion, and only the pulverized product in the form of slurry moves in a downward flow through the passage in the wall of the non-rotating section by the classification means provided at the upper end of the grinding chamber. be done. It then passes through a passage consisting of a classification means provided at the lower end of the compartment wall, moves to a concentric crushing chamber adjacent to the non-rotating compartment wall, and is crushed as the stirring member rotates under an upward flow. Fine pulverization is further progressed by pressurization and friction of the pulverized product based on vigorous stirring of the medium, and final pulverization is performed. In this way, only the final finely pulverized product is discharged from the passageway of the central discharge pipe, which is equipped with a classification means at the upper end, in the form of products with a size of several micrometers. In this way, the crushed material is supplied to the concentrically divided crushing chambers, and is sequentially moved through the passages to progress the fine crushing, and in each crushing chamber, as the fine crushing progresses,
Fine pulverization is performed using a pulverization means that can obtain pulverization conditions that correspond to the circumferential speed of the stirring member, and the classification effect is improved, making it possible to achieve pulverization of solid materials down to several micrometers. can.

[Example] Hereinafter, an example of the present invention will be described in detail with reference to the drawings.

FIG. 1 shows the configuration of an embodiment of the present invention.

In FIG. 1, reference numeral 10 indicates a central axis, which is disposed on a line in the vertical direction, and a rotary cylinder 14 is provided on the central axis 10, and is rotated around the line using a drive device (not shown). be done. Reference numeral 12 designates a crushing container, which has a cylindrical shape and consists of a side plate 12a, a cover 12c, and a bottom plate 12b. The rotating body 14 has a bell shape, and the body plate 1
4a and a cover 14b, a central shaft 10 is attached to the cover 14b, and stirring members shown in FIG. 2 or 3 are mounted on the outer surface of the body plate 14a at predetermined intervals in the vertical direction. 16, 16a are attached.

In FIG. 1, there is a predetermined gap between the outer surface of the body plate 14a and the crushing container 12, and the crushing medium 18
is filled to form a concentric first grinding chamber 20.

Reference numeral 28 is a partition wall made of a double wall, and is fixed to the bottom plate 12b of the crushing container 12 without rotating. A predetermined gap is provided between the inner surface of the body plate 14a and the partition wall 28, and the gap is filled with a grinding medium 30, forming a concentric second grinding chamber 32 adjacent to the first grinding chamber 20. ing. The partition wall 28 is provided with a classification means 34 at its upper end and a classification means 36 at its lower end, and a passage 35 is formed within the double wall. A stirring member 38 shown in FIG. 4 is vertically attached to the cover 14b of the rotating body 14, and 38a is a mounting rod and 38b is a disk. - A hollow discharge pipe 40 is provided at the center of the line, with the hollow part serving as a passage 50, and a classifying means 42 is attached to the upper end. Further, since the discharge pipe 40 can move in the vertical direction as indicated by the chain line 40a, the position of the classifying means 42 can be made variable. A stirring member 38 is located in the space between the inner wall surface of the partition wall 28 and the surface of the discharge pipe 40 , and is filled with a grinding medium 46 . A crushing chamber 48 is formed.

The inlet 22 is attached to the cover 12c at a position on the outer periphery of the crushing container 12, and supplies the slurry-like crushed material, as well as the crushing medium 18 and the crushing medium 3 used in the first crushing chamber 20 and the second crushing chamber 32.
This is to be filled with 0's.

The inlet 24 is attached to the cover 12c at approximately the center of the crushing container 12, and is used for filling the third crushing chamber 48 with a crushing medium 46. Similarly, the cover 14b has an opening 15 and a guide plate 1.
4c is attached to facilitate filling of the grinding media 46. The bottom plate 12b is also provided with openings 41 and 43, respectively, through which the grinding media 18, 30 and 46 are discharged from the grinding vessel 12. A passage 26 is provided in the gap between the bottom plate 12b and the bottom plate 12b of the rotating body 14,
The first crushing chamber 20 and the second crushing chamber 32 are connected. Further, the second crushing chamber 32 and the third crushing chamber 48 are connected via a passage 35 of the partition wall 28,
Furthermore, the third grinding chamber 48 is connected to the passage 50 .

The first grinding chamber 20, the second grinding chamber 32, and the third grinding chamber 48 are filled with grinding media 18, 30, and 46 of predetermined dimensions at a required filling rate.

The average size of the grinding media 18, 30 and 40 is adapted to decrease sequentially in each grinding chamber 20, 32 and 48.

As the central shaft 10 rotates, the stirring member 16,
The inner surface of the body plate 14a and the stirring member 38 rotate, and the corresponding grinding media 18, 30 are rotated.
and 46 with vigorous stirring. At this time, since the peripheral speeds of the above-mentioned elements are not the same, the shape, quantity, gap, etc. of the stirring member are selected,
A pulverizing means is used that provides optimum pulverizing conditions.

Next, to explain the operation of the above embodiment, the crushed material enters the first crushing chamber 20 from the inlet 22 and the crushing medium 18
Under intense agitation, in the downward flow of slurry-like granules, due to the pressure and friction of the granules,
Dispersion into the liquid is promoted and pulverization progresses sequentially. Continuing from the passage 26 to the second grinding chamber 3
2 and becomes an upward flow, and under the intense movement of the grinding medium 30, rapid pulverization of the slurry-like pulverized product progresses, passes through the classification means 34, and flows downward through the passage 35. After moving, the classification means 36
The powder is then moved to the third grinding chamber 48, where the pulverization is further progressed by pressurization and friction of the pulverized product under vigorous stirring of the pulverizing medium 46 under an upward flow. Final pulverization is performed. Thus,
The finished finely pulverized product passes through the classifying means 42 and is discharged to the outside of the pulverization container 12 from the passage 50 of the central discharge pipe 40. Furthermore, in the classification means 34, 36, and 42, the surfaces of the grinding media 30 and 46 are constantly renewed as the grinding media 30 and 46 move, so that stagnation of the finely ground products in the form of slurry does not occur. The classification effect is improved.

Furthermore, when the above-mentioned stirring members 16, 38, etc. are worn out and need to be replaced, the cover 12c can be opened and the entire rotary drum 14 can be taken out of the crushing container 12, making the replacement work easier. This makes it easier and the replacement time can be shortened.

FIG. 2 shows the stirring member 16, which has a plurality of short rods and is evenly attached radially to the outer surface of the body plate 14a.
It is installed in the vertical direction of a.

FIG. 3 shows the stirring member 16a, which has an annular shape and is attached to the outer surface of the body plate 14a.

In FIG. 4, the stirring member 38 is shown. It should be noted that the embodiments of the present invention are of course not limited to the above embodiments, and various embodiments can be adopted for the crushing container, the stirring member, the classifying means, and the like.

[Effects of the Invention] As is clear from the above embodiments, in the present invention, pulverization progresses as the crushed material sequentially moves through the pulverization chambers, and as the pulverization progresses in each pulverization chamber, the circumferential speed of the stirring member increases. Since pulverization is performed using a pulverization means that can obtain the optimal pulverization conditions corresponding to the differences, it is possible to improve the classification action and significantly improve pulverization performance, and it is easy to replace consumable parts. This has great effects, such as the ability to finely pulverize solid materials down to several micrometers.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram of a method and apparatus for pulverizing a solid material in one embodiment of the present invention, and FIGS. 2, 3, and 4 are explanatory diagrams of a stirring member of the same method and apparatus, respectively. 10... Central axis, 20, 32, 48... Grinding chamber, 18, 30, 46... Grinding media.

Claims (1)

[Claims] 1. Grinding media in a plurality of concentrically partitioned grinding chambers are agitated by a plurality of stirring members rotating around a central shaft, and the pulverized material is stirred at the outer periphery under a downward flow and an upward flow. A method for pulverizing a solid material, which is characterized by pulverizing a solid material by sequentially moving it from a pulverizing chamber to a central pulverizing chamber. 2. The crushing container is divided into a plurality of concentric crushing chambers by a rotary drum and a partition wall, the crushing chambers are filled with a crushing medium, and the rotary drum is equipped with a stirring member to make the rotary drum rotatable; A pulverizing device for solid materials, characterized in that a passageway is provided for pulverizing the material by sequentially moving the material from a pulverizing chamber at the outer periphery to a pulverizing chamber at the center under a downward flow and an upward flow.