JPH08989A - Fine powdery material producing apparatus - Google Patents

Abstract

PURPOSE:To provide a fine powdery material producing apparatus which can prevent the occurrence of aggregation at the time of heat treatment operation and easily provides a fine powdery material as an aggregate of primary particle bodies. CONSTITUTION:This fine powdery material producing apparatus is provided with a cylindrical container which is supported transversely and driven to rotate round an axial center P, partitioning parts 2 installed at every position where the cylindrical container should be partitioned in the longitudinal direction, a large number of rotating media 3 stored between those neighboring partitioning parts 2, a supplying pipe 13 for supplying a fine powdery raw material L which penetrates the partitioning parts 2 and is led onto the rotating media 3, and a heating means 6 to heat the inside of the cylindrical container in which the rotating media 3 are stored. Every partitioning part 2 is so formed as to have an open part 4b through which only a fine powdery material S can pass.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for producing a fine powder material used for obtaining a solid fine powder material by subjecting a fluid fine powder material to a heat treatment operation.

[0002]

2. Description of the Related Art Conventionally, a heat treatment operation such as drying or calcination is applied to a fluid fine powder raw material, for example, a clay or a slurry (hereinafter referred to as a ceramic slurry) which is a mixture of a ceramic component and a solution. Moreover, when obtaining a solid fine powder material, that is, a ceramic material, it is common to use a heat treatment furnace of well-known structure called a batch type or a continuous type (neither is shown). Has become. Then, in the batch type heat treatment furnace, the ceramic slurry is injected into the box which is a box-shaped container made of ceramic or heat-resistant metal, and the box in which the ceramic slurry is injected is placed in the heating chamber. After that, a solid ceramic material is obtained by performing a heat treatment operation such as drying and calcination by heating at a required temperature for a predetermined time or only drying or calcination.

Further, a pusher type tunnel furnace or a rotary kiln is generally used as a continuous heat treatment furnace. In the pusher type tunnel furnace, the box into which the ceramic slurry is injected is sequentially transferred from the inlet side to the outlet side for heating. After that, the ceramic material is obtained by cooling. Furthermore, in the rotary kiln, the ceramic core that is a cylindrical container made of ceramics or heat-resistant metal is heated to the required temperature and then rotated, while the ceramics supplied dropwise from the end of the inlet side of this core tube are supplied. Heating is performed while transferring the rally through the furnace core tube, and the ceramic material in a solid state is discharged from the end of the furnace core tube on the outlet side. The ceramic material, which is a solid fine powder material obtained by the above procedure, is crushed using a ball mill or a crusher and then sent to the main firing step.

[0004]

By the way, the ceramic materials obtained by using the above-mentioned various manufacturing apparatuses generally cause agglomeration due to the heat treatment operation, and are set to a certain size. It is usually obtained as a porous secondary particle body. And, it is very difficult for the ceramic material that has become the secondary particles to be in the form of fine powder even if post-treatment such as crushing is performed, and it is necessary to completely eliminate the pores generated during the heat treatment operation. Cannot be done. Therefore, it is inevitable that pores will remain in the ceramic sintered body obtained by the main firing of the crushed ceramic material, making it difficult to densify, and in reality the characteristics of the final product will deteriorate. there were.

The present invention was devised in view of such inconveniences, and it is possible to easily obtain a fine powder material which is a collection of primary particles which are not agglomerated. The purpose is to provide the device.

[0006]

A fine powder manufacturing apparatus according to the present invention includes a cylindrical container that is laterally supported and is driven to rotate about an axis, and a position inside the cylindrical container that is spaced apart along the longitudinal direction. The partition members attached, a large number of rolling mediums housed between these partition members, a supply pipe of the fine powder raw material that has penetrated through the partition members and is drawn onto the rolling medium, and the rolling medium. A heating means for heating the inside of the housed cylindrical container is provided, and each of the partition members is formed with an opening through which only the fine powder material passes.

[0007]

According to the above construction, the fluid fine powder raw material supplied into the cylindrical container through the supply pipe is dropped onto the rolling medium to be supplied, and the solution in the fine powder raw material is heated. It is quickly evaporated by being supplied to the inside of the cylindrical container heated by. Therefore, only the ceramic component as a solid component contained in the fine powder raw material remains on the surface of the rolling medium mixed with the rotation of the cylindrical container, and the surface of the rolling medium The ceramic components adhered to the upper portion are finely pulverized because the rolling media are rubbed against each other. Then, the crushed ceramic component is gradually moved to the partition member side with the rotation of the cylindrical container while being heat-treated by being surrounded by the rolling medium, and then formed on the partition member. After passing through the opening, it is discharged to the outside as a solid ceramic material.

[0008]

Embodiments of the present invention will be described below with reference to the drawings.

The fine powder material manufacturing apparatus according to this embodiment is
It is used to obtain a ceramic material that is a solid fine powder material by applying a heat treatment operation such as drying or calcination to a ceramic slurry that is an example of a fluid fine powder raw material. FIG. 1 is a sectional view showing a simplified overall structure of a fine powder material manufacturing apparatus, and FIG. 2 is an external perspective view showing the structure of a partition member.

The manufacturing apparatus according to the present embodiment is provided with a cylindrical container 1 which is laterally supported and is rotationally driven around the axis P. The cylindrical container 1 has a time required for a heat treatment operation. It is laterally supported with the axis P inclined by a corresponding angle of 2.5 to 5 °. And
A partition member 2 is attached at each position in the cylindrical container 1 that is separated by a predetermined distance along the longitudinal direction, and a large number of rolling media 3 called media (cobblestones) are provided between the partition members 2. Is stored. The cylindrical container 1 here is made of ceramic, quartz, heat-resistant metal or the like having a predetermined thickness, has a total length of about 600 mm, and is 100 to 250 corresponding to the throughput.
It has an inner diameter of about mm.

Each of the partition members 2 is made of the same material as the cylindrical container 1, and as shown in FIG. 2, a circle having a predetermined thickness having an outer diameter corresponding to the inner diameter of the cylindrical container 1. It is composed of a plate portion 4 and a plurality of support plate portions 5 extending from the edge of the disc portion 4. A plurality of slit-shaped openings 4a having a predetermined width that allow only the processed ceramic material S to pass through while preventing the rolling medium 3 from passing through are provided in the disc portion 4 of the partition member 2. Each of the disk portions 4 is positioned in such a manner that the supporting plate portions 5 are brought into contact with the inner peripheral surface of the cylindrical container 1 to be positioned and then the cylindrical container 1 is attached in a closed state. Further, a through hole for penetrating a slurry supply pipe, which will be described later, is provided at the axial center position of the disk portion 4 constituting one of the partition members 2, that is, at the position corresponding to the axial center P of the cylindrical container 1. 4b is formed. On the other hand, each rolling medium 3 is made of ceramic or heat-resistant metal, and is made in a spherical shape or a cylindrical shape having a diameter of about 1 to 50 mm. The number and material of the rolling medium 3 to be stored are cylindrical. It is selected in consideration of the internal volume of the container 1 and the characteristics of the ceramic slurry L (ceramic material S).

Further, this manufacturing apparatus uses electric heat as a heating means for heating the inside of the cylindrical container 1, that is, the cylindrical container 1 itself and the rolling medium 3 housed therein to a required temperature and maintaining the heating state. A heater 6 and a heat insulating wall 7 which is provided with the electrothermal heater 6 built therein and surrounding the outer periphery of the cylindrical container 1 are provided. Both ends of the cylindrical container 1 are projected to the outside through openings provided in the heat insulating wall 7, one end of which is driven by the drive roller 9 to which the electric motor 8 is connected, and the other end of which is The end portions of are separately supported by the driven roller 10. Therefore, the cylindrical container 1 is rotationally driven by the electric motor 8 at a low speed after passing through the driving roller 9 and the driven roller 10.

Furthermore, the manufacturing apparatus according to the present embodiment is equipped with a slurry supplying device 11 for supplying the ceramic slurry L to the cylindrical container 1, and the slurry supplying device 11 projects from the heat insulating wall 5. It is installed at a position above the outside of the other end of the cylindrical container 1. That is, the slurry supply device 11 includes a slurry storage tank 12 in which the prepared ceramic slurry L is stored.
And a slurry supply pipe 13 extending therefrom. The slurry supply pipe 13 passes through a through hole 4b formed in the disc portion 4 of the partition member 2 and then on the rolling medium 3. Have been drawn to. In addition, by adjusting the drawing length of the slurry supply pipe 13 at this time, that is, the position of the open end of the slurry supply pipe 13,
Of course, the heat treatment time can be adjusted.

From the open end of the slurry supply pipe 13, the ceramic slurry L is dropped onto the rolling medium 3 contained in the cylindrical container 1. Note that the ceramic slurry L does not necessarily have to be supplied by dripping, and the ceramic slurry L is provided on the upper side of the cylindrical container 1 after a nozzle (not shown) is attached to the open end of the slurry supply pipe 13. Needless to say, spraying may be performed on the inner surface located.
At this time, the opening / closing valve 1 for controlling the supply amount of the ceramic slurry L is provided at an intermediate position of the slurry supply pipe 13.
4 is installed.

Next, a procedure for obtaining the ceramic material S from the ceramic slurry L by applying a heat treatment operation using the manufacturing apparatus according to this embodiment will be described.

First, a prepared ceramic slurry L, which is a mixture of a solid ceramic component and a solution of water or an organic solvent, is prepared, while a cylindrical container 1 containing a large number of rolling media 3 is prepared. While rotating at low speed by the electric motor 8, the cylindrical container 1 and the rolling medium 3 are heated to a required temperature by using the electric heater 4. At this time, when the ceramic slurry L is dried, the cylindrical container 1
In addition, the rolling medium 3 is heated to about 500 ° C., or, in the case of calcination, to about 1000 ° C. Then, the ceramic slurry L stored in the slurry storage container 12 is dripped little by little from the open end of the slurry supply pipe 13 toward the rolling medium 3 while being adjusted by the opening / closing valve 14 constituting the slurry supply means 11. Then,
The solution such as water contained in the dropped ceramic slurry L is quickly evaporated by coming into contact with the rolling medium 3, and is contained on the surface of the rolling medium 3 in the ceramic slurry L. Only the ceramic component, which is the fine powder component, adheres and remains.

However, even during this period, a large number of rolling media 3 are mixed with the rotation of the cylindrical container 1 and rubbed against each other. Therefore, the rolling media 3 remain attached to the surface of each rolling medium 3. The ceramic components are finely pulverized because the rolling media 3 collide against each other and are rubbed against each other. Since the crushed ceramic component is surrounded by the rolling medium 3, it is gradually supported laterally while being subjected to a further heat treatment operation, that is, on the partition member 2 side, that is, with the axis P inclined. Cylindrical container 1
Will be moved to the side of the partition member 2 attached to the lower position of the cylindrical container 1 with the rotation of the cylindrical container 1, and after passing through the opening 4a of the disc portion 4 constituting the partition member 2, the solid state The ceramic material S is discharged to the outside. The heat-treated ceramic material S thus discharged is recovered by the recovery container 15 installed in advance and then sent to the main firing step.

By the way, in this embodiment, in order to facilitate the discharge of the ceramic material S and to adjust the time required for the heat treatment, the cylindrical container 1 is laterally supported with the axis P inclined by a slight angle. However, the cylindrical container 1 may be supported in a horizontal state in which it is not tilted, and in such a case, the ceramic material S is provided from both of the partition members 2 mounted in the cylindrical container 1. Will be discharged. The configuration of these partition members 2 is not limited to that shown in FIG.
Even if it is configured by using a net 16 made of a heat-resistant metal as shown in the modified example of FIG. 3, or alternatively, a partition member 2 as shown in the modified example of FIG. Pair of tubular bodies 1 connected as concentric
A double tube structure composed of 8 and 19 may be used. The partition member 2 having a double pipe structure as shown in FIG.
In the case of using, it is needless to say that the penetrating portion (denoted by reference numeral 20 in FIG. 4) surrounded by the plate body 17 and the tube bodies 18, 19 must be smaller than the size of the rolling medium 3. is there.

Further, in the present embodiment, the electric heater 4 is used as the heating means to heat the cylindrical container 1 and the rolling medium 3 housed therein, but electromagnetic induction heating or dielectric heating is used. It is also possible to use a heating means formed by When the electromagnetic induction heating is used, the ceramic slurry L (ceramic material S) can be heated regardless of the material of the cylindrical container 1 as long as the rolling medium 3 has conductivity. When dielectric heating is used, the ceramic slurry L is used regardless of the materials of the cylindrical container 1 and the rolling medium 3.
The (ceramic material S) itself can be directly heated.

[0020]

As described above, according to the apparatus for producing a fine powder material according to the present invention, the solution in the fine powder raw material which is dripped and supplied into the cylindrical container heated by the heating means is promptly supplied. The fine powder component in the fine powder raw material adheres and remains on the surface of the rolling medium, and is crushed by rubbing these rolling mediums. Therefore, in spite of the fact that the heat treatment operation was applied to the fine powder raw material, it was not the secondary particle body in which the agglomeration had occurred due to the heat treatment operation as in the conventional example, but the fine powder as a primary particle body in which no agglomeration occurred. Body material will be obtained.

As a result, when the fine powder material thus obtained is used, it becomes possible to produce a product having a density close to the theoretical density, and it is possible to improve the characteristics and stabilize the quality of the final product. The effect of being able to do is obtained.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a simplified overall configuration of a fine powder material manufacturing apparatus according to an embodiment.

FIG. 2 is an external perspective view showing a configuration of a partition member.

FIG. 3 is an external perspective view showing a modified example of the partition member.

FIG. 4 is an external perspective view showing another modified example of the partition member.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 cylindrical container 2 partition member 3 rolling medium 4b opening of partition member 6 electric heater (heating means) 13 slurry supply pipe (supply pipe) P axial center of cylindrical container L ceramic slurry (fluid-like fine powder raw material) S ceramic material (Solid fine powder material)

Claims (1)

[Claims] 1. A fine powder material manufacturing apparatus for obtaining a solid fine powder material (S) by subjecting a fluid fine powder material (L) to a heat treatment operation, which is laterally supported and rotates around an axis (P). A cylindrical container (1) which is driven to rotate, and a partition member (2) attached at each position separated along the longitudinal direction in the cylindrical container (1).
And a large number of rolling media (3) housed between these partition members (2) and the fine powder raw material (L) that has penetrated through the partition members (2) and has been drawn up onto the rolling media (3). ) Supply pipe (13) and a cylindrical container (1) containing a rolling medium (3)
And a heating means (6) for heating the inside of each of the partition members, and each of the partition members (2) is formed with an opening (4b) through which only the fine powder material (S) passes. Fine powder material manufacturing equipment.