WO2010024038A1

WO2010024038A1 - Medium-agitating powder processing device

Info

Publication number: WO2010024038A1
Application number: PCT/JP2009/061930
Authority: WO
Inventors: 河原正佳; 吉川雅浩; 柴田高志
Original assignee: ホソカワミクロン株式会社
Priority date: 2008-08-25
Filing date: 2009-06-30
Publication date: 2010-03-04
Also published as: JP2010046646A; KR20110065460A; JP5451006B2; CN102131586A; KR101431045B1; EP2351616A4; EP2351616A1; KR20130111643A

Abstract

Provided is a medium-agitating powder processing device wherein the efficiency of a series of processes from crushing of a raw material to be processed to classification and collection of crushed powder can be enhanced. The medium-agitating powder processing device (1) which comprises agitating members (5) provided to rotate freely about the vertical axis and to project radially outward from a agitating shaft (4) in a single or a plurality of stages, which agitates and crushes a raw material to be processed together with a medium (6) in a container (2) by means of the mixing members (5), and which collects crushed powder through a classification rotor (10) provided at an upper part in the container (2). Inner wall of the container (2) has an inclined plane (21) which is displaced increasingly toward the center side as the plane extends toward the upper part, and the inclined plane (21) is formed upward from a position not higher than the lower end face of the agitating member (5) in the uppermost stage.

Description

Medium stirring powder processing equipment

The present invention relates to a medium stirring type powder processing apparatus that stirs and crushes a raw material to be processed together with a medium in a container.

A stirrer is provided that protrudes radially outward from the stirrer shaft in one or more stages and is rotatable about the vertical axis. Conventionally, a medium stirring type pulverizer and a ball mill are known (for example, see Patent Documents 1 to 4 below). In such a medium stirring pulverizer, the medium is stirred in the container by rotating the stirring member around the vertical axis. The raw material to be treated is pulverized by a pulverizing force between the media generated at this time, that is, a shearing force, an impact force, a compressive force, a grinding force and the like.

Further, in such a medium agitating type pulverizer, a classifier for selecting the raw material to be processed (fine powder) according to the particle diameter is provided in the upper part of the container, and the fine powder is passed through the classifier. There is also known a medium stirring type pulverizer of a type that is classified and collected. For example, the medium stirring type pulverizer described in

Patent Documents

1 and 2 among the documents cited above corresponds to this.

In the medium agitation type pulverizers described in

Patent Documents

1 and 2, a flowing gas blowing port is provided at the bottom of the container, and the fine powder pulverized in the container rises by the flowing gas blown out from the bottom of the container. It is made to be led to the classifier. As a result, unnecessary residence time of the fine powder after pulverization in the container is reduced, and the fine powder can be prevented from aggregating as much as possible to improve the pulverization efficiency. In addition, in

Patent Documents

1 and 2, although there is no explicit description in the specification, a configuration in which an inclined surface in which the inner surface of the container is displaced toward the center is formed on the upper portion of the container is illustrated in the drawings. Yes.

Further, the medium agitation type pulverizer described in Patent Document 3 includes an upper agitation member (upper agitation agitator) and a lower agitation blade that are provided so as to be relatively rotatable, and the upper agitation member and the lower agitation blade are opposite to each other. Rotate at different speeds. This makes it possible to improve the grinding efficiency by preventing the fine powder after grinding from adhering in the container as much as possible. Note that Patent Document 3 describes that the inner surface of the container is formed on an inclined surface that gradually becomes smaller in diameter toward the top.

Further, Patent Document 4 describes that an inclined surface having a smaller diameter toward the upper part is formed on the upper part of the container. The medium agitation type pulverizer described in Patent Document 4 is a so-called wet type medium agitation type pulverizer in which the raw material to be treated is supplied in a slurry state.

JP 2005-270780 A JP 2003-265975 A JP 2005-199124 A JP 59-102452 A

In the medium agitation type pulverizer described in

Patent Documents

1 and 2, the medium is scraped to the agitation member as the agitation member rotates about the vertical axis, and is given a centrifugal force by rotating inside the container. While rotating around the vertical axis in the container, it collides with the inner wall of the container and rises in the container along the inner wall of the container. Thereafter, the movement of descending to the center of the container due to gravity and ascending again in the container is repeated. Here, in the medium agitation type pulverizers described in

Patent Documents

1 and 2, the containers at the height positions of all the agitation members (in particular, the upper end surface of the uppermost agitation member) provided over a plurality of stages. The inner wall is a vertical surface orthogonal to the bottom surface. In such a medium agitation type pulverizer, the pulverizing force can be improved as the agitation speed is increased. However, as the agitation speed is increased, the medium greatly increases along the vertical plane, and before and after the increase to the decrease. In this case, the medium rises greatly. As a result, energy input for stirring the medium is not sufficiently converted to energy for pulverization, and energy loss increases. Therefore, in the medium agitation type pulverizers described in

Patent Documents

1 and 2, if the agitation speed is increased above a predetermined speed, the pulverization efficiency decreases due to an increase in the lift of the medium near the inner wall of the container. There was a problem.

In this regard, the medium agitating pulverizer described in Patent Document 3 has the same problem. That is, in the medium agitation type pulverizer described in Patent Document 3, although the adhesion of the fine powder to the inner surface of the container is reduced by the lower agitation blade, the shape of the inner wall of the container is the same as the upper agitation member (here Then, in particular, at the height position of the upper end surface of the uppermost upper stirring member, a vertical surface perpendicular to the bottom surface is formed. Therefore, the medium scraped by the upper stirring member and given centrifugal force by rotating in the container also rises greatly along the inner surface (vertical surface) of the container, and before and after the medium turns from rising to falling, It will rise greatly. Therefore, energy loss becomes large, and the pulverization efficiency of the raw material to be processed decreases.

Further, the medium agitation type pulverizer described in Patent Document 4 is a wet type medium agitation type pulverizer as described above. In such a wet type medium agitating type pulverizer, as indicated by an arrow A in the drawing of Patent Document 4, the behavior of the medium and the material to be treated in the container is a dry type medium agitating type pulverizer. Is different. For this reason, the problem of a decrease in the powder grinding efficiency due to the floating of the medium in the vicinity of the inner wall of the container, which is inherent in the medium stirring type pulverizer described in Patent Documents 1 to 3, is represented by Patent Document 4. It hardly occurs in a wet type medium stirring type pulverizer. However, since the raw material to be treated is supplied in the form of a slurry, in order to obtain a dry powder, the process of drying the fine powder after pulverization, or the fine powder that is in an agglomerated state after drying is solved. A step of crushing is required. Therefore, as compared with a dry type medium agitating pulverizer, a series of processing efficiencies until a dry powder corresponding to the particle diameter is obtained must be reduced.

The present invention has been made in view of the above-mentioned problems, and while stirring a material to be treated together with a medium in a container by a stirring member and pulverizing the medium, medium stirring for recovering the pulverized powder through a classifier An object of the present invention is to improve a series of processing efficiency from pulverization of a raw material to be processed to classification and collection of the pulverized powder in a mold powder processing apparatus.

In order to achieve this object, the present invention comprises a stirring member that protrudes radially outward from the stirring shaft according to the present invention in one or more stages and is provided so as to be rotatable about the vertical axis. A characteristic configuration of a medium stirring type powder processing apparatus that stirs and pulverizes a raw material to be processed together with a medium in a container, and classifies and collects the powder after pulverization through a classifier provided in the upper part of the container The inner wall of the container has an inclined surface that is displaced toward the center toward the upper part, and the inclined surface is formed from the height position of the lower end surface of the uppermost stirring member or from below to above. It is in the point.

According to the above characteristic configuration, the inner surface of the container at least at the height position of the lower end surface of the uppermost stirrer is an inclined surface that is displaced toward the center toward the upper part. In the height region (the height region from the lower end surface to the upper end surface) occupied by the uppermost stirring member, the medium to which the force is applied receives an oblique downward force when it collides with the inner wall (inclined surface) of the container. . Thereby, the ascending force acting on the medium pushed up along the inner wall by the centrifugal force can be reduced, and the excessive lifting of the medium in the container can be suppressed. Therefore, the energy input for stirring the medium can be effectively converted as the energy for pulverization, and the pulverization efficiency can be improved.

By the way, when the medium is lifted, the material to be treated and the powder after pulverization are likely to adhere to the inner wall in the lifted portion. In this respect, according to the above-described characteristic configuration, it is possible to prevent the medium from being lifted, and thus it is possible to prevent the raw material to be processed and the powder after pulverization from adhering to the inner wall. Further, by suppressing the lifting of the medium, the medium, the raw material to be processed, and the pulverized powder (hereinafter referred to as “powder / medium”) are formed between the vicinity of the inner wall of the container and the center of the container. The height difference of the envelope surface can be reduced. Therefore, the flow rate of the gas for conveying the pulverized powder can be made uniform, and the powder can be conveyed to the classifier well. Therefore, a series of processing efficiencies from pulverization of the raw material to be processed to collection of the pulverized powder through the classifier can be improved.

Here, it is preferable that the inclined surface is formed from the bottom of the container.

According to this configuration, the lifting force of the medium can be reliably reduced in the height region occupied by many stirring members. Therefore, excessive lifting of the medium in the container can be more reliably suppressed. Therefore, the powder processing efficiency can be further improved.

Further, the stirring member is provided in a plurality of stages with respect to the stirring shaft, and the length from the axial center of the stirring shaft to the tip of the stirring member at the uppermost stage is a stage one step below It is preferable that the length is set shorter than the length to the tip of the stirring member.

According to this configuration, when the stirring member is rotated at a constant angular velocity, the peripheral speed at the tip of the uppermost stirrer is greater than the peripheral speed at the tip of the stirrer of the lowermost stage. Can be small. Therefore, the centrifugal force applied to the medium by the uppermost stirring member can be reduced. As a result, the ascending force in the container can be reduced to prevent the medium from rising.

Further, it is preferable that an interposing member is provided between the upper end surface of the stirring shaft and the lower end surface of the classifier.

According to this configuration, the gas for conveying the pulverized powder to the classifier can be raised around the insertion member while maintaining a substantially constant speed. Therefore, since the pulverized powder can be efficiently conveyed to the classifier, a series of processing efficiency from pulverization to classification can be further improved.

Further, it is preferable to provide a gas outlet that is provided along the circumferential direction on the side surface of the container and jets gas inward in the radial direction.

According to this configuration, pulverization mixed in the medium and the raw material to be processed by increasing the dispersion force in the region (stirring region) where the powder / medium in the container is agitated by the gas ejected from the gas ejection port. The latter powder can be extracted from the stirring area and conveyed above the container. Therefore, unnecessary stagnation in the stirring region of the powder after the pulverization treatment can be reduced, and the raw material to be processed can be prevented from being excessively pulverized, and the series of processing efficiency in the container can be improved.

It is a figure which shows the structure of the medium stirring type powder processing apparatus which concerns on this embodiment. It is explanatory drawing for demonstrating the force which acts on the medium in the inner wall vicinity of a container. It is a schematic diagram which shows the state of envelope surfaces, such as a medium, in a container. It is a graph which shows the relationship between the inclination-angle of an inclined surface, and a grinding | pulverization efficiency. It is a schematic diagram which shows the structure of the medium stirring type powder processing apparatus which concerns on another embodiment. It is a schematic diagram which shows the structure of the medium stirring type powder processing apparatus which concerns on another embodiment. It is a schematic diagram which shows the structure of the medium stirring type powder processing apparatus which concerns on another embodiment. It is a schematic diagram which shows the structure of the medium stirring type powder processing apparatus which concerns on another embodiment.

Next, an embodiment of a medium stirring type powder processing apparatus according to the present invention will be described with reference to the drawings. The medium stirring type powder processing apparatus 1 according to the present embodiment stirs and pulverizes the pulverized raw material together with the medium 6 in the container 2 by the stirring member 5 and through the classification rotor 10 provided in the upper part of the container 2. Thus, the fine powder after pulverization is collected. FIG. 1 is a diagram showing a structure of a medium stirring type powder processing apparatus 1 according to the present embodiment. FIG. 2 is an explanatory diagram for explaining the force acting on the medium 6 in the vicinity of the inner wall of the container 2, and FIG. 3 is a schematic diagram showing the state of the envelope surface 24 in the container 2.

The medium stirring type powder processing apparatus 1 according to the present embodiment includes a stirring member 3, a medium 6, a bottom plate 7, and a classification rotor 10 as a classifier in a container 2, as shown in FIG. In addition, a gas outlet 13 provided on the side surface of the container 2, a jacket 16 provided on the outer periphery of the container 2, and a gas inlet 17 are provided. A raw material supply port 8 is provided in the upper part of the container 2, and the raw material is supplied from a screw feeder 9 connected to the raw material supply port 8. The container 2 has an inclined surface 21 that is displaced toward the center toward the upper part on the inner wall thereof.

In this embodiment, a plurality of stirring members 5 protrude radially outward from the substantially cylindrical stirring shaft 4 in a plurality of stages. That is, the stirring member 5 is rotatably provided around the vertical axis (rotation axis Z) in the container 2, and is pulverized as a raw material to be treated by rotating around the vertical axis (rotation axis Z). The raw material is stirred with the medium 6 and pulverized. Here, in the present embodiment, the length from the rotation axis Z in one stage to the tip of the stirring member 5 (hereinafter, sometimes referred to as “stirring diameter”) is in the lower stage. It is set to be shorter than each of the stirring members 5. That is, the stirrer 5 is set so that the stirrer diameter is sequentially shortened as the stirrer 5 is arranged in the upper stage. And in this embodiment, the clearance C between the front-end | tip part of the stirring member 5 in each step | paragraph and the inner wall (specifically inclined surface 21) of the container 2 mentioned later is made constant. The clearance C is preferably 4 times or more or 1/3 or less of the diameter of the medium 6 so that the medium 6 is not sandwiched between the stirring member 5 and the inner wall of the container 2. Note that “the clearance C is constant” means that the clearance C in each stage is substantially equal, and is not a concept that is required to be strictly equal. Therefore, even if the clearance C fluctuates due to wear or the like, if the degree of variation is, for example, about 1/3 or less of the diameter of the medium 6, “clearance C is constant” here is included. In the example shown in the figure, two stirrers 5 are provided at the same height in five stages, and are arranged in a staggered arrangement in which each stage is sequentially displaced by 90 degrees. The stirring shaft 4 is connected to an output portion of a drive motor (not shown), and the stirring shaft 4 and the stirring member 5 rotate based on the drive.

The material of the medium 6 is selected according to the type of raw material to be pulverized, and for example, a material made of metal such as stainless steel or a material made of ceramics is appropriately used. In order to increase the impact force generated between the media 6, it is preferable to use a material having a high density. The size of the medium 6 is selected according to the particle size of the fine powder to be taken out. However, generally, when the diameter is reduced, the impact force generated between the media 6 is reduced, and conversely, when the diameter is increased, the number of contact points is reduced and the chance of collision is reduced, making it difficult to pulverize. Therefore, it is preferable to use a medium 6 having a diameter of 2 to 6 mm. In consideration of the fact that the diameter of the medium 6 gradually decreases due to wear with use, it is optimal to set the initial value of the diameter to about 5 to 6 mm.

The bottom plate 7 is a disk-shaped member that is disposed at the bottom of the container 2 and covers an area from the center to the inner wall. The bottom plate 7 divides the inside of the container 2 into two regions, a powder processing chamber P and a gas chamber G. The powder processing chamber P is a space from the bottom plate 7 to the classification rotor 10 in the container 2, and is a space for stirring the pulverized raw material together with the medium 6 by the stirring member 5 to perform pulverization. The gas chamber G is a space for temporarily storing the flowing gas supplied from the flowing gas supply path 15a. Here, air is usually used as the flowing gas. However, when the raw material is a substance unstable to oxygen, an inert gas such as nitrogen, helium, or argon may be used. Further, the flowing gas may be cooled and heated, or a humidified gas may be used. Alternatively, it may be introduced through a filter or the like. The bottom plate 7 is provided with a through hole 7a through which gas can pass. As the bottom plate 7, a porous plate, for example, a plate having slit-like through holes, a punching metal, a porous plate, or the like can be used. Then, the flowing gas is blown from the gas chamber G to the powder processing chamber P through the through holes 7a provided in the bottom plate 7, and the fine powder pulverized in the powder processing chamber P is raised by the flowing gas. Is guided to the classification rotor 10. Here, in order to secure a large amount of flowing gas from the gas chamber G to the powder processing chamber P, the number of the through holes 7a is as large as possible and the total area of the through holes 7a is increased. Is preferred. However, the size is kept at least so that the medium 6 in the powder processing chamber P does not fall.

A raw material supply port 8 is provided on the upper side surface of the container 2. A screw feeder 9 as a raw material supply means is connected to the raw material supply port 8, and the pulverized raw material is supplied into the container 2 by the screw feeder 9. Such a screw feeder 9 is suitably used when the raw material is solid, particularly powdery, and the raw material is continuously charged at a constant speed. Note that a double damper, a rotary valve, or the like may be used instead of the screw feeder. Further, the raw material supply means such as a screw feeder can be directly supplied to the raw material supply port 8 without supplying the raw material via the air transport pipe. Although not shown in the drawings, if the weight of the medium stirring type powder processing apparatus 1 is controlled by weight measuring means such as a load cell, the raw material supply is performed so that the amount of residence in the apparatus is constant even when continuous processing is performed. The amount can be adjusted.

In the present embodiment, the inside of the container 2 is divided into a gas chamber G and a powder processing chamber P with the bottom plate 7 interposed therebetween, a gas outlet 13 near the upper surface of the bottom plate 7, and a rotating shaft ( A classifying rotor 10 that rotates around is provided. From the gas chamber G, the flowing gas flows into the powder processing chamber P through the through holes 7 a provided in the bottom plate 7. From the gas ejection port 13, the ejection gas is ejected into the powder processing chamber P. The space in the powder processing chamber P is constituted by an agitation region R where the medium 6 is agitated and a classification region Q located above the agitation region R. In the powder processing chamber P, the fine powder stirred and pulverized together with the medium 6 by the stirring member 5 in the stirring region R is raised to the classification region Q by the transport gas for transporting it. Here, “carrier gas” refers to one or both of a flowing gas and a jet gas. A classification rotor 10 that rotates around the vertical axis is provided at the center upper portion inside the container 2, and the raised fine powder is classified by the classification rotor 10 and collected as product powder. The classification rotor 10 has a plurality of classification blades 10a provided radially. The fine powder is classified based on the balance between the radial centrifugal force generated by the rotation of the classification rotor 10 and the inflow of gas into the classification rotor 10. The rotation speed of the classification rotor 10 is set according to the particle diameter of the product powder to be collected. In the present embodiment, the classifying rotor 10 constitutes a “classifier” in the present invention.

The container 2 has an inclined surface 21 that is displaced toward the center on the inner wall thereof. In the present embodiment, the inclined surface 21 is formed from the bottom of the container 2. In this example, the inclined surface 21 is formed from the position of the bottom plate 7. Thereby, the inner wall of the container 2 in the height position of all the stirring members 5 is the inclined surface 21. In the present embodiment, the inclined surface 21 has a constant inclination, and the container as a whole has a conical shape with the tip cut off. The inclination angle at this time is preferably 3 degrees or more and 35 degrees or less with respect to the vertical direction, and more preferably 6 degrees or more and 35 degrees or less. It is even more preferable if it is 6 degrees or more and 25 degrees or less, and the optimum inclination angle is 11 degrees.

Here, the behavior of the medium 6 in the powder processing chamber P will be described. Centrifugal force F (see FIG. 2) acts on the medium 6 as the stirring member 5 rotates about the vertical axis (rotation axis Z). The medium 6 to which the centrifugal force F is applied collides with the inner wall of the container 2, is pushed up by another medium 6, and rises in the container 2 along the inner wall of the container 2. Thereafter, the movement of lowering to the center of the container 2 due to gravity and then rising again in the container 2 is repeated (see the two-dot chain arrow in FIG. 1). At this time, since an inclined surface 21 is formed on the inner wall of the container 2 so as to be displaced toward the center as it goes upward, the medium 6 is inclined when the medium 6 collides with the inner wall of the container 2 as shown in FIG. The surface 21 receives a drag force N in a direction opposite to the component perpendicular to the inclined surface 21 of the centrifugal force F (diagonally downward). As a result, the medium 6 receives the vertically downward vertical component Ny of the drag N, and the upward force pushed up by the other medium 6 in the vicinity of the inner wall is reduced, so that excessive lifting of the medium 6 in the container 2 is suppressed. Is done. In particular, in the present embodiment, the inclined surface 21 is formed from the position of the bottom plate 7, and the lifting force of the medium 6 is reduced at all positions above the bottom plate 7, so that the lifting of the medium 6 is effectively performed. It is suppressed.

Further, in the present embodiment, as described above, each of the stirring members 5 is stirred so that the length (stirring diameter) from the rotation axis Z to the tip end portion thereof becomes shorter as it is arranged in the upper stage. The length of the member 5 is set. Therefore, when the stirring shaft 4 rotates at a constant angular velocity, the peripheral speed at the tip of each stirring member 5 becomes smaller as it is arranged in the upper stage. Therefore, in the stirring region R of the medium 6, the centrifugal force F (see FIG. 2) applied to the medium 6 by the stirring member 5 becomes smaller toward the upper part. Therefore, the floating of the medium 6 in the container 2 is also suppressed from this point.

Thus, by suppressing the floating of the medium 6 in the vicinity of the inner wall of the container 2, the energy input for stirring the medium 6 can be effectively used as the energy for pulverization. Therefore, the pulverization efficiency can be improved as compared with a conventional medium stirring type powder processing apparatus in which the container 2 is formed in a straight body.

By the way, in the stirring region R where the medium 6 and the raw material powder are stirred by the stirring member 5, the carrier gas passing through the same region is likely to escape from the portion where the ventilation resistance by the powder / medium is low. Therefore, when the height difference of the envelope surface 24 increases, the carrier gas easily escapes from the center portion of the container 2 where the height of the envelope surface 24 decreases, and conversely from the vicinity of the inner wall of the container 2 where the height of the envelope surface 24 increases. The carrier gas is difficult to escape, and the ventilation of the carrier gas in the stirring region R becomes uneven depending on the location. As a result, it becomes difficult to transport the fine powder uniformly to the classification region Q. For example, a powder larger than the desired particle diameter is conveyed, while the desired particle diameter is also achieved. Regardless of the fact that the powder that is not transported remains in the stirring region R, the so-called over-pulverization that is unnecessarily refined occurs. In this regard, according to the medium stirring type powder processing apparatus 1 according to the present embodiment, the height difference of the envelope surface 24 formed by the powder / medium can be reduced by suppressing excessive lifting of the medium 6. (Refer to FIG. 3, the two-dot broken line indicates a state in which the container 2 is formed in a straight body.) Therefore, it is easy for the carrier gas to escape between the vicinity of the inner wall of the container 2 and the center of the container 2. Can be reduced. As a result, it is possible to make the air flow of the carrier gas in the stirring region R more uniform, and the fine powder can be more uniformly conveyed to the classification region Q by the carrier gas. Therefore, compared to the conventional medium agitation type powder processing equipment, the series of processing efficiency from pulverization to classification is improved by suppressing the occurrence of excessive pulverization by suppressing the retention of fine powder in the agitation region R. Can be made.

The gas ejection port 13 is provided on the side surface of the container 2 along the circumferential direction so that gas can be ejected radially inward. In the present embodiment, a slit-like gas ejection port 13 is provided over the entire circumference of the container 2 on the side surface of the container 2 located in the vicinity of the upper surface of the bottom plate 7. In addition to this, for example, a plurality of gas jets 13 are arranged in a substantially uniform manner along the circumferential direction, or a porous member or the like is provided to provide the gas jets 13 over the entire circumference of the container 2. By adopting a configuration, the gas may be ejected substantially uniformly radially inward from a plurality of positions. The gas to be ejected (ejection gas) can be the same type of gas as the flowing gas, and can be air or an inert gas such as nitrogen as described above. In addition to controlling the temperature and humidity of the jet gas, it may be introduced through a filter or the like. In the present embodiment, the same gas supplied from the gas supply passage 15 is branched into two supply passages, that is, a flowing gas supply passage 15a and an ejection gas supply passage 15b. It flows out from the outlet 13 into the container 2 (powder processing chamber P). The gas ejected from the gas ejection port 13 plays a role of extracting the fine powder after pulverization mixed in the medium 6 and the pulverized raw material from the agitation region R and transporting it above the container 2 in the agitation region R. Therefore, the unnecessary residence in the stirring area | region R of the fine powder in the container 2 can be reduced. Thereby, it is possible to prevent the fine powder from being excessively pulverized and improve a series of processing efficiency from pulverization to classification. Further, in the present embodiment, since the gas ejection port 13 is provided in the vicinity of the upper surface of the bottom plate 7, it is possible to prevent stagnation and adhesion of fine powder at the corners of the inner wall of the container 2 and the bottom plate 7. it can.

An annular channel 14 is provided on the outer periphery of the container 2 so as to cover the gas ejection port 13. The annular flow channel 14 is interposed between the gas ejection port 13 and the gas ejection channel 15 b for supplying the gas ejection gas to the gas ejection port 13. The space formed inside the annular flow path 14 is a space for temporarily storing the jet gas supplied from the jet gas supply path 15 b and jetted into the container 2 through the gas jet port 13. Play a role. The jet gas supplied from the jet gas supply channel 15 b is supplied to the gas jet port 13 after the pressure is equalized in the annular channel 14. Thereby, a jet gas can be jetted from the gas jet port 13 substantially uniformly. As a result, the fine powder can be uniformly dispersed in the container 2, and the series of processing efficiency can be further improved.

A gas inlet 17 is provided on the side surface of the container 2 above the stirring member 5 to allow gas to flow inwardly from the side surface of the container 2. The gas inflow port 17 can be formed in a slit shape provided so that gas flows upward from the entire circumference of the side surface of the container 2, for example. Moreover, it is good also as a structure which provides the gas inflow port 17 in the tangential direction with respect to the container 2 so that gas may flow in swirling, or the structure which inclines in a tangential direction many blade | wings in the perimeter of the container 2. The inflowing gas (inflowing gas) can be the same type of gas as the flowing gas or the jetting gas, and can be an air or an inert gas such as nitrogen as described above. In addition to adjusting the temperature and humidity of the inflowing gas, it may be introduced through a filter or the like. The inflow gas from the gas inlet 17 prevents the fine powder from adhering to the inner wall of the container 2 and at the same time serves as a dispersion gas for classification.

The jacket 16 is provided on the outer periphery of the container 2 and functions as a temperature adjusting means for adjusting the temperature of the container 2 to an arbitrary temperature. In this embodiment, the container 2 is cooled by flowing cooling water into the jacket 16. During the operation of the medium stirring type powder processing apparatus 1, even if cold air is introduced from the gas jet 13 or the like and the temperature in the container 2 is kept relatively low, the temperature of the inner wall of the container 2 increases. In some cases, the pulverized raw material and the fine powder adhering to the inner wall cause thermal deterioration. Therefore, if the cooling water is allowed to flow into the jacket 16 and used as a cooling means as in the present embodiment, the temperature of the inner wall of the container 2 can be prevented from rising. The medium stirring type powder processing apparatus 1 according to the present embodiment can also be effectively applied to the pulverization.

Further, in the present embodiment, the insertion member 12 is provided between the upper end surface 4 u of the stirring shaft 4 and the lower end surface 10 d of the classification rotor 10. In the present embodiment, the insertion member 12 is a substantially cylindrical member having a lower end surface that substantially matches the shape of the upper end surface 4 u of the stirring shaft 4, and is connected to the stirring shaft 4. The upper end surface 12u of the insertion member 12 connected to the stirring shaft 4 and the lower end surface 10d of the classifying rotor 10 are disposed close to each other. As a result, the space between the upper end surface 4u of the stirring shaft 4 and the lower end surface 10d of the classification rotor 10 is substantially filled, and the classification region Q positioned above the stirring region R has an annular cross section. It has become.

Here, when such an insertion member 12 is not provided, the carrier gas and the fine powder that has risen in the powder processing chamber P due to this are classified from the upper end surface 4u of the stirring shaft 4 where the opening area increases. In the classification region Q up to the height position of the lower end surface 10d of the rotor 10, the rising speed is reduced. As a result, the fine powder cannot be sufficiently conveyed to the classification rotor 10, and the fine powder once pulverized is agglomerated in the middle of conveyance and stalled, and again falls into the stirring region R of the medium 6. May end up. This has been one of the causes of overgrinding.

On the other hand, the medium stirring type powder processing apparatus 1 according to the present embodiment interposes the insertion member so as to fill a space formed between the upper end surface 4u of the stirring shaft 4 and the lower end surface 10d of the classification rotor 10. 12 is provided. As a result, the cross section of the classification region Q becomes an annular space having a hollow portion at the center, and the opening area is substantially the same over the entire classification region Q. Therefore, the carrier gas and the fine powder conveyed by this Rises while maintaining a substantially constant speed. Therefore, since fine powder can be efficiently conveyed to the classification rotor 10, a series of processing efficiency from pulverization to classification can be further improved.

Hereinafter, the pulverization process of the medium stirring type powder processing apparatus 1 according to the present embodiment will be described based on examples.

(Experiment 1)
First, a container (hereinafter referred to as a conical container) formed with an inclined surface 21 that is displaced toward the center from the position of the bottom plate 7 and a container (hereinafter referred to as a cylindrical container) formed entirely in a straight body are used. Thus, the relationship between the number of rotations of classification, the particle size of the recovered fine powder, and the processing capacity was investigated. The inclined surface 21 of the conical container has an inclination of 11 degrees, and both the conical container and the cylindrical container have a bottom plate 7 with a diameter of 600 mm. Further, a steel ball having a diameter of 5.0 mm is used as the medium 6 and heavy calcium carbonate (specific surface area equivalent diameter: 1.0 μm) is used as a pulverized raw material, and the processing air volume is 10 m ³ which is the total amount of flowing gas, jetting gas and inflowing gas. / Min, continuous processing was performed under the operating conditions of a stirring member rotating at 120 rpm. In addition, the classification rotation speed of the classification rotor 10 was set to 3000 rpm and 7000 rpm, the specific surface area converted diameter was determined by measurement by the BET method, and the processing capacity was determined as a processing amount per unit time. The results are shown in Table 1.

According to Table 1, when a cylindrical container was used, a fine powder having substantially the same diameter was collected regardless of the difference in the classification rotation speed, and when the classification rotation speed was 3000 rpm, it was 7000 rpm. It was confirmed that the processing capacity was lower than the case. Here, considering the classification principle, theoretically, the larger the classification rotation speed, the smaller the specific surface area equivalent diameter and the smaller the processing capacity. However, the results when using a cylindrical container are contrary to this theory. This is because in a cylindrical container, the pulverization efficiency is lowered due to the floating of the medium 6 and the flow velocity of the carrier gas rising in the container 2 is not increased due to the difference in height of the envelope surface 24 formed by the medium 6 and the like. It is thought that the cause is that it becomes uniform.

On the other hand, when the conical container was used, it was confirmed that the specific surface area equivalent diameter was larger and the processing capacity was higher when the classification rotation speed was 3000 rpm than when it was 7000 rpm. Further, when compared with a conical container and a cylindrical container when the classification rotation speed is 7000 rpm, the conical container has a processing capacity of about 15% in order to obtain a fine powder having a substantially equivalent specific surface area diameter. It was confirmed that there was an improvement. As a result, it was confirmed that a series of processing efficiency from pulverization to classification was improved.

(Experiment 2)
Next, using a conical container having a diameter of the bottom plate 7 of 600 mm, the inclination of the inclined surface 21 is changed between 0 degree and 35 degrees with respect to the vertical direction, and the inclination angle of the inclined surface 21 and the grinding efficiency are I investigated the relationship. In addition, the thing whose inclination of the inclined surface 21 is 0 degree | times is corresponded to the cylindrical container as a comparative example. A zirconia ball having a diameter of 3 mm is used as the medium 6, talc (average particle diameter: 13 μm) is used as a pulverized raw material, and the treatment air volume is 10 m ³ / min, the rotating speed of the stirring member is 120 rpm, and the continuous speed is 7000 rpm. It was. The average particle diameter was determined by measuring by a laser diffraction / scattering method, and the processing capacity was determined as a processing amount per unit time. The grinding efficiency was determined by dividing the processing capacity by the power required for the grinding process. The results are shown in FIG. In Table 2, the pulverization efficiency at each inclination angle with respect to the pulverization efficiency when the inclination of the inclined surface 21 is 0 degrees is shown as a pulverization efficiency ratio.

As is clear from FIG. 4, it was confirmed that the crushing efficiency was improved when the inner wall of the conical container had a certain inclination angle. Further, according to Table 2, when the inclination angle of the inclined surface 21 of the conical container is in the range of 3 to 35 degrees, the pulverization efficiency is improved by about 11% or more compared to the case using the cylindrical container. Was confirmed. It was also confirmed that the crushing efficiency was improved by about 21% or more when the inclination angle was in the range of 6 to 35 degrees. Furthermore, when the inclination angle is in the range of 6 to 25 degrees, the crushing efficiency is similarly improved by about 43% or more, and when the inclination angle is 11 degrees, the crushing efficiency is improved by about 54%. It was confirmed that the pulverization efficiency was remarkably improved as compared with the case where it was.

(Experiment 3)
Next, with and without the insertion member 12 provided in the space from the upper end surface 4u of the stirring shaft 4 to the lower end surface 10d of the classification rotor 10 using a conical container having a diameter of the bottom plate 7 of 600 mm. The relationship between the number of rotations of classification, the average particle size of the recovered fine powder, and the processing capacity was examined. Here, the distance H from the upper end surface 4u of the stirring shaft 4 to the lower end surface 10d of the classification rotor 10 when the insertion member 12 is not provided is about 300 mm, and when the insertion member 12 is provided, the distance is the same. The clearance between the lower end surface 10d of the classification rotor 10 and the upper end surface 12u of the insertion member 12 was about 10 mm. Further, a zirconia ball having a diameter of 5.0 mm is used as the medium 6, glass powder (average particle diameter: 33 μm) is used as a pulverized raw material, and a continuous treatment is performed under the operating conditions of a treatment air volume of 10 m ³ / min and a stirring member rotating speed of 130 rpm. It was. In addition, while classifying rotation speed of the classifying rotor 10 was set to 3000 rpm and 7000 rpm, the average particle diameter was determined by measurement by a laser diffraction scattering method, and the processing capacity was determined as a processing amount per unit time. The results are shown in Table 3.

According to Table 3, when the insertion member 12 is not provided, it is confirmed that there is not much difference in the average particle diameter and processing capacity of the recovered product powder for a large difference in the classification rotation speed. It was done. This is because the fine powder rising in the powder processing chamber P by the carrier gas is in the classification region Q from the upper end surface 4u of the stirring shaft 4 where the opening area becomes large to the height position of the lower end surface 10d of the classification rotor 10. It is considered that this is because the rising speed of the carrier gas decreases, and the fine powder cannot be efficiently conveyed to the classification rotor 10.

On the other hand, when the insertion member 12 was provided, it was confirmed that the average particle diameter was larger and the processing capability was greatly improved when the classification rotation speed was 3000 rpm compared to 7000 rpm. . Furthermore, in each classifying rotation speed, when the insertion member 12 is provided and when the insertion member 12 is not provided, the former (when the insertion member 12 is provided) clearly has improved processing capability. Was confirmed.

[Other Embodiments]
(1) In the above embodiment, the inclined surface 21 is formed from the position of the bottom plate 7 in the container 2, and the inner wall of the container 2 at the height position of all the stirring members 5 is the inclined surface 21. Was described as an example. However, the embodiment of the present invention is not limited to this. That is, if the inclined surface 21 is configured to be formed at least at the height position of the lower end surface of the uppermost stirrer member 5 or from the lower side to the upper side, the intermediate portion of the plurality of steps is provided. May be formed from the height position of the upper end surface or the lower end surface of the stirring member 5, that is, the inner wall of the container 2 at the height position of all the stirring members 5 may not necessarily be the inclined surface 21. For example, as shown in FIG. 5, the container 2 can be configured to have a straight body portion having a vertical surface 22 that is substantially orthogonal to the bottom surface from the bottom surface of the container 2 to a predetermined height position. In this case, the inclined surface 21 is formed continuously from the vertical surface 22. Further, as shown in FIG. 6, in addition to the inclined surface 21 (this is the first inclined surface) in which the inner wall of the container 2 is displaced toward the center as the upper part, a second inclination that is displaced outward as the upper part is formed. It is good also as a structure which has the surface 23. FIG. At this time, the second inclined surface 23 can be configured to extend from the bottom plate 7 to any height position below the uppermost stirring member 5. In this case, the first inclined surface 21 is formed continuously from the second inclined surface 23.
In these cases, as compared with the case where the inclined surface 21 is formed from the position of the bottom plate 7 in the container 2, there is an advantage that the processing capacity can be increased with the container 2 having a large capacity. Further, compared with the case where the inclined surface 21 is formed from the position of the bottom plate 7, although the effect of suppressing the floating of the medium 6 is somewhat reduced, the corner of the bottom of the container 2 where the retention of the medium 6 and the pulverized raw material is relatively likely to occur. In this part, there is an advantage that circulation of the medium 6 can be promoted.

(2) In the above embodiment, the case where the inclination of the inclined surface 21 is constant has been described as an example. However, the embodiment of the present invention is not limited to this. For example, forming the inclined surface 21 such that the inclination of the inclined surface 21 increases toward the upper part is one of the preferred embodiments of the present invention. By doing so, the vertical component Ny (see FIG. 2) of the drag N that the medium particle 6 receives from the inclined surface 21 increases toward the upper part, so that the floating of the medium 6 in the container 2 is further suppressed. Is done.

(3) In the above embodiment, the case where the inner wall of the container 2 forms the inclined surface 21 has been described as an example. However, the embodiment of the present invention is not limited to this. For example, the inclined surface 21 may be formed by attaching another member in the container 2 while the shape of the container 2 is a straight body. Furthermore, the inner wall above the height position where the lift of the medium can be suppressed may be a straight cylinder without being inclined. In this case, the inner diameter of the upper body of the container 2 is preferably in the range of 1.3 to 2 times the outer diameter of the classification rotor 10.

(4) In the above-described embodiment, the case where the length (stirring diameter) from the rotation axis Z to the tip thereof is sequentially shortened as the stirring member 5 is arranged in the upper stage will be described as an example. did. However, the embodiment of the present invention is not limited to this. For example, as shown in FIG. 5 and FIG. 6, it is also one of the preferred embodiments of the present invention that the stirring diameter in one stage is partially set to be equal to the stirring diameter in the lower stage. It is. However, in order to make the peripheral speed at the tip portion of the uppermost stirring member 5 smaller than that of the other stirring members 5, the stirring diameter at least at the uppermost stage is set shorter than the stirring diameter in the stage one stage lower than the uppermost stage. In addition, in the other stages, the stirring diameter in one stage is preferably set to be shorter or equal to the stirring diameter in the lower stage. In the examples of FIGS. 5 and 6, the stirring diameter from the bottom to the third stage is set to be equal, and thereafter, the stirring diameter is set to be sequentially shortened toward the upper stage. In this case, the stirring diameter is set along the shape of the inner wall of the container 2, and the clearance C between the tip of the stirring member 5 and the inner wall of the container 2 at each stage is made substantially constant. preferable. The stirring diameters in all the stages may be set to be equal, or the stirring diameter in one stage may be set to be partly larger than the stirring diameter in the lower stage.

(5) In the above-described embodiment, the case where the stirrer members 5 are provided in five stages of two at the same height and are displaced by 90 degrees in each stage has been described as an example. However, the embodiment of the present invention is not limited to this. That is, the number of stirring members 5 and the number of stirring members 5 in each step can be set arbitrarily. In addition, when the number of stages of the stirring member 5 is only one, the one stage is the uppermost stage. Further, the displacement angle in the case of the staggered arrangement can be arbitrarily set. The shape of the agitating member 5 may be circular, elliptical, polygonal, such as a quadrilateral, or other shapes, and the tip may be paddle-shaped.

(6) In the above embodiment, slit-like gas jets 13 are provided on the side of the container 2 over the entire circumference of the container 2, and the entire circumference of the container 2 is covered so as to cover these gas jets 13. The case where the annular flow path 14 is provided as an example has been described. However, the embodiment of the present invention is not limited to this. For example, a plurality or a plurality of rows of gas jets 13 are arranged in the circumferential direction on the side surface of the container 2, and an annular flow path provided at a part of the outer periphery of the container 2 so as to cover at least these gas jets 13. It may be a configuration provided.

(7) In the above embodiment, the case where the gas ejection port 13 is provided on the side surface of the container 2 located near the upper surface of the bottom plate 7 has been described as an example. However, the embodiment of the present invention is not limited to this. For example, it is good also as a structure which provides the gas jet nozzle 13 in the side surface of the container 2 in the intermediate position of the stirring area | region R of the medium 6. FIG. Even in this case, the dispersion efficiency of the fine powder in the container 2 can be improved by raising the fine powder after pulverization above the container 2.

(8) In the above embodiment, the case where one airflow type classifying rotor 10 rotating around the vertical axis is provided as a classifier at the upper center in the container 2 has been described as an example. However, the embodiment of the present invention is not limited to this. For example, a single classification rotor 10 that rotates about the horizontal axis may be used. Moreover, as shown in FIG. 7, it is also one of the preferred embodiments of the present invention that a plurality of classification rotors 10 rotating around the horizontal axis are used in combination. Such a configuration is suitable as a configuration when the container 2 described above has a straight body portion. In other words, when a large processing capacity is to be obtained using the medium stirring type powder processing apparatus 1 having the large capacity container 2, a relatively large classification can be achieved by using a plurality of relatively small classification rotors 10 in combination. Compared with the case where only one rotor 10 is used, the classification accuracy can be improved. When one classifying rotor 10 that rotates around the horizontal axis is used, the rotating outer peripheral surface of the classifying blade 10a located at the bottom corresponds to the “lower end surface 10d of the classifier”.
As the classifier, other classifiers that do not use the classifying rotor 10 may be used.

(9) In the above embodiment, the case where the space from the upper end surface 4u of the stirring shaft 4 to the lower end surface 10d of the classification rotor 10 is filled by connecting the insertion member 12 to the stirring shaft 4 will be described as an example. did. However, the embodiment of the present invention is not limited to this. For example, as shown in FIG. 5, the insertion member 12 is connected to the classification rotor 10 so as to fill a space from the upper end surface 4 u of the stirring shaft 4 to the lower end surface 10 d of the classification rotor 10. It is one of the preferred embodiments of the present invention. In the example of FIG. 7, a plurality of classifying rotors 10 that are used in combination are integrally configured via a product recovery pipe (or a connection pipe for product recovery) 11, and an insertion member 12 is connected to the product recovery pipe 11. Has been. In this case, the plurality of classifying rotors 10 and the product recovery pipes 11 constitute a single “classifier” as a whole, and the upper end surface 4u of the stirring shaft 4 and the insertion member 12 connected to the classifier The lower end surface 12d is disposed in proximity.
Further, the insertion member 12 may be supported from the container 2 using a support member without being connected to the stirring shaft 4 or the classification rotor 10. Further, in the above embodiment, the insertion member 12 has a shape in which the outer diameter becomes smaller toward the upper part, but according to the outer diameter of the stirring shaft 4 and the outer diameter of the classification rotor 10, or the rising speed of the carrier gas. In order to increase the speed, the outer diameter of the insertion member 12 may be changed as appropriate, for example, by increasing the outer diameter of the insertion member 12 toward the top or by making it cylindrical with the same upper and lower diameters.

(10) Alternatively, as shown in FIG. 8, the height of the container 2 may be lowered so that the upper end surface 4 u of the stirring shaft 4 and the lower end surface 10 d of the classification rotor 10 are arranged close to each other. It is one of the preferred embodiments of the present invention. Also by adopting such a configuration, the fine powder can be efficiently conveyed to the classification rotor 10, so that a series of processing efficiency from pulverization to classification can be improved.

(Experiment 4)
Table 4 shows the relationship between the classification rotational speed, the average particle diameter of the recovered product powder, and the treatment capacity in this case. The experimental conditions are the same as in Experiment 3 above.

According to Tables 3 and 4, when the upper end surface 4u of the stirring shaft 4 and the lower end surface 10d of the classification rotor 10 are arranged close to each other, the upper end surface 12u of the insertion member 12 connected to the stirring shaft 4 and the classification rotor. Compared with the case where the lower end surface 10d of 10 is arranged close to the lower end surface 10d, an effect of improving the processing capability equal to or higher than that is confirmed.

(11) In the above embodiment, the case where the shape of the stirring shaft 4 is substantially cylindrical has been described as an example. However, the embodiment of the present invention is not limited to this. That is, for example, the shape of the stirring shaft 4 may be an inverted conical shape having a larger diameter at the top, which is one preferred embodiment of the present invention. When such a configuration is adopted, more of the concave space generated in the center of the envelope surface 24 formed by the powder / medium can be filled with the stirring shaft 4, so that the vicinity of the inner wall of the container 2 And the difference in the ease of escape of the carrier gas between the center portion of the container 2 and the container 2 can be further reduced. Therefore, the flow velocity of the carrier gas rising in the container 2 can be made uniform, and a series of processing efficiency from pulverization to classification can be further improved.

(12) In the above embodiment, the case where the container 2 is cooled by flowing cooling water into the jacket 16 as the temperature adjusting means has been described as an example. However, the embodiment of the present invention is not limited to this. That is, for example, a configuration in which the fine powder is dried simultaneously with the pulverization by heating the container 2 by circulating a heating medium heated to a predetermined temperature in the jacket 16 is also preferable implementation of the present invention. One of the forms. As the heat medium in this case, for example, warm water, steam, oil, or the like can be used.

(13) In the above embodiment, the case where the medium stirring type powder processing apparatus 1 according to the present invention is applied to perform the pulverization process has been described as an example. However, the embodiment of the present invention is not limited to this. That is, for example, the present invention can be applied to surface treatment, spheroidization, flattening, compounding, precision mixing, drying, and other powder treatments.

The medium stirring type powder processing apparatus 1 according to the present invention includes, for example, lithium compounds such as lithium carbonate, lithium hydroxide, lithium nickelate, lithium cobaltate, and lithium manganate; sodium nitrate (sodium nitrate), sodium hydroxide, Sodium compounds such as sodium carbonate, sodium bicarbonate, sodium sulfite, sodium nitrite, sodium sulfide, sodium silicate, sodium nitrate, sodium bisulfate, sodium thiosulfate, sodium chloride; magnesium sulfate, magnesium chloride, magnesium hydroxide, magnesium oxide, carbonic acid Magnesium compounds such as magnesium, magnesium acetate, magnesium nitrate, magnesium oxide, magnesium hydroxide; aluminum hydroxide, aluminum sulfate, aluminum hydroxide, polyaluminum chloride, aluminum oxide, alum, aluminum chloride Aluminum compounds such as silicon nitride, aluminum nitride; silicon compounds such as silicon oxide, silicon nitride, silicon carbide, calcium silicate, magnesium silicate, sodium silicate, aluminum silicate; potassium chloride, potassium hydroxide, potassium sulfate, potassium nitrate Potassium compounds such as calcium carbonate; calcium compounds such as calcium carbonate, calcium chloride, calcium sulfate, calcium nitrate, calcium hydroxide; titanium such as titanium oxide, barium titanate, strontium titanate, titanium carbide, titanium nitride, etc. Compound; Manganese compound such as manganese sulfate, manganese carbonate, manganese oxide; Iron compound such as iron oxide; Cobalt compound such as cobalt chloride, cobalt carbonate, cobalt oxide; Nickel compound such as nickel hydroxide, nickel oxide; acid Yttrium compounds such as yttrium and yttrium iron garnet; zirconium compounds such as zirconium hydroxide, zirconium oxide, zirconia silicate and zircon sand; antimony compounds such as antimony chloride, antimony oxide and antimony sulfate; barium chloride, barium oxide and nitric acid Barium compounds such as barium, barium hydroxide, barium carbonate, barium sulfate, barium titanate; bismuth compounds such as bismuth oxide, bismuth carbonate, bismuth hydroxide; inorganic compounds such as alnico, iron, chromium, cobalt -Based, iron-manganese-based, barium-based, strontium-based, samarium-cobalt-based, neodymium-iron-boron-based, manganese-aluminum-carbon-based, praseodymium-based, platinum-based magnetic materials; other pigments, glass However, the present invention is not limited to this, but can be suitably used for the treatment of metal oxides, metal oxides, organic compounds, carbon, activated carbon, coke, minerals, talc, battery materials, hydrogen storage alloys and the like.

In addition to the above, the present invention can be suitably used for a medium stirring type powder processing apparatus for producing powders of, for example, metals, ceramics, or grains.

DESCRIPTION OF SYMBOLS 1 Medium stirring type powder processing apparatus 2 Container 4 Stirring shaft 5 Stirring member 6 Medium 7 Bottom plate 10 Classification rotor (classifier)
12 Insertion member 13 Gas outlet 14 Annular flow path 21 Inclined surface Z Rotation axis

Claims

A stirrer member that protrudes radially outward from the stirrer shaft over one or more stages and is provided to be rotatable about the vertical axis,
In the medium stirring type powder processing apparatus, the raw material to be processed is stirred and pulverized together with the medium in the container by the stirring member, and the pulverized powder is recovered through a classifier provided in the upper part of the container. There,
The inner wall of the container has an inclined surface that is displaced toward the center toward the top,
The medium agitation type powder processing apparatus, wherein the inclined surface is formed at a height position of a lower end surface of the uppermost stirring member or from below to above.
The medium stirring type powder processing apparatus according to claim 1, wherein the inclined surface is formed from a bottom of the container.
The stirring member is provided in a plurality of stages with respect to the stirring shaft,
The length from the axial center of the stirring shaft to the tip of the stirring member in the uppermost stage is set shorter than the length to the tip of the stirring member in the lower stage. 2. The medium stirring type powder processing apparatus according to 2.
The medium stirring type powder processing apparatus according to any one of claims 1 to 3, further comprising an insertion member between an upper end surface of the stirring shaft and a lower end surface of the classifier.
The medium stirring type powder processing apparatus according to any one of claims 1 to 4, further comprising a gas outlet provided on a side surface of the container along a circumferential direction and ejecting gas radially inward.