WO2010024038A1 - 媒体攪拌型粉体処理装置 - Google Patents
媒体攪拌型粉体処理装置 Download PDFInfo
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- WO2010024038A1 WO2010024038A1 PCT/JP2009/061930 JP2009061930W WO2010024038A1 WO 2010024038 A1 WO2010024038 A1 WO 2010024038A1 JP 2009061930 W JP2009061930 W JP 2009061930W WO 2010024038 A1 WO2010024038 A1 WO 2010024038A1
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- Prior art keywords
- container
- medium
- stirring
- gas
- powder
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C17/00—Disintegrating by tumbling mills, i.e. mills having a container charged with the material to be disintegrated with or without special disintegrating members such as pebbles or balls
- B02C17/16—Mills in which a fixed container houses stirring means tumbling the charge
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C13/00—Disintegrating by mills having rotary beater elements ; Hammer mills
- B02C13/10—Disintegrating by mills having rotary beater elements ; Hammer mills with horizontal rotor shaft and axial flow
- B02C13/12—Disintegrating by mills having rotary beater elements ; Hammer mills with horizontal rotor shaft and axial flow with vortex chamber
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C13/00—Disintegrating by mills having rotary beater elements ; Hammer mills
- B02C13/14—Disintegrating by mills having rotary beater elements ; Hammer mills with vertical rotor shaft, e.g. combined with sifting devices
- B02C13/18—Disintegrating by mills having rotary beater elements ; Hammer mills with vertical rotor shaft, e.g. combined with sifting devices with beaters rigidly connected to the rotor
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C13/00—Disintegrating by mills having rotary beater elements ; Hammer mills
- B02C13/26—Details
- B02C13/28—Shape or construction of beater elements
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C17/00—Disintegrating by tumbling mills, i.e. mills having a container charged with the material to be disintegrated with or without special disintegrating members such as pebbles or balls
- B02C17/16—Mills in which a fixed container houses stirring means tumbling the charge
- B02C17/161—Arrangements for separating milling media and ground material
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C17/00—Disintegrating by tumbling mills, i.e. mills having a container charged with the material to be disintegrated with or without special disintegrating members such as pebbles or balls
- B02C17/18—Details
- B02C17/183—Feeding or discharging devices
- B02C17/186—Adding fluid, other than for crushing by fluid energy
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C17/00—Disintegrating by tumbling mills, i.e. mills having a container charged with the material to be disintegrated with or without special disintegrating members such as pebbles or balls
- B02C17/18—Details
- B02C17/24—Driving mechanisms
Definitions
- 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.
- a medium stirring type pulverizer and a ball mill are known (for example, see Patent Documents 1 to 4 below).
- 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.
- 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.
- 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.
- 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.
- 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.
- 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.
- 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.
- 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.
- the pulverizing force can be improved 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.
- 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.
- 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.
- the medium agitation type pulverizer described in Patent Document 4 is a wet type medium agitation type pulverizer as described above.
- 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.
- 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.
- 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.
- 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.
- 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. .
- 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.
- the material to be treated and the powder after pulverization are likely to adhere to the inner wall in the lifted portion.
- 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.
- 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.
- the inclined surface is formed from the bottom of the container.
- 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.
- 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.
- 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.
- an interposing member is provided between the upper end surface of the stirring shaft and the lower end surface of the classifier.
- 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.
- 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.
- 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.
- 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
- 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 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.
- 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
- 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.
- 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.
- 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.
- the stirrer 5 is set so that the stirrer diameter is sequentially shortened as the stirrer 5 is arranged in the upper stage.
- 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.
- 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.
- 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.
- 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.
- air is usually used as the flowing gas.
- an inert gas such as nitrogen, helium, or argon may be used.
- 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.
- 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.
- 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.
- 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.
- a double damper, a rotary valve, or the like may be used instead of the screw feeder.
- 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.
- 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.
- 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.
- the gas chamber G 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.
- the gas ejection port 13 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.
- 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.
- 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.
- 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.
- the inclined surface 21 is formed from the bottom of the container 2.
- the inclined surface 21 is formed from the position of the bottom plate 7.
- the inner wall of the container 2 in the height position of all the stirring members 5 is the inclined surface 21.
- 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.
- Centrifugal force F 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).
- 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).
- 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.
- 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.
- 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.
- 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.
- 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.
- the height difference of the envelope surface 24 formed by the powder / medium can be reduced by suppressing excessive lifting of the medium 6.
- the two-dot broken line indicates a state in which the container 2 is formed in a straight body.
- 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.
- 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.
- 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.
- the gas may be ejected substantially uniformly radially inward from a plurality of positions.
- the gas to be ejected 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.
- 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
- 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
- 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.
- the inflowing gas 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.
- the container 2 is cooled by flowing cooling water into the jacket 16.
- the temperature of the inner wall of the container 2 increases.
- 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.
- 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.
- 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.
- 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.
- 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.
- the rising speed is reduced.
- 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.
- the medium stirring type powder processing apparatus 1 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.
- 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.
- 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.
- 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.
- 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 ⁇ m) 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.
- 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.
- the conical container when 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.
- 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.
- a zirconia ball having a diameter of 5.0 mm is used as the medium 6
- glass powder (average particle diameter: 33 ⁇ m) 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.
- 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.
- 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.
- 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.
- 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.
- the inclined surface 21 is formed continuously from the vertical surface 22.
- 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.
- 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.
- the first inclined surface 21 is formed continuously from the second inclined surface 23.
- the embodiment of the present invention is not limited to this.
- 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.
- 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.
- the case where the inner wall of the container 2 forms the inclined surface 21 has been described as an example.
- the embodiment of the present invention is not limited to this.
- 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.
- the inner wall above the height position where the lift of the medium can be suppressed may be a straight cylinder without being inclined.
- 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.
- 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.
- the stirring diameter in one stage is preferably set to be shorter or equal to the stirring diameter in the lower stage.
- 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.
- 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.
- 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.
- the stirrer members 5 are provided in five stages of two at the same height and are displaced by 90 degrees in each stage.
- 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.
- 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.
- the embodiment of the present invention is not limited to this.
- 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.
- 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 .
- the embodiment of the present invention is not limited to this.
- 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
- 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.
- 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.
- the rotating outer peripheral surface of the classifying blade 10a located at the bottom corresponds to the “lower end surface 10d of the classifier”.
- the classifier other classifiers that do not use the classifying rotor 10 may be used.
- 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.
- 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.
- 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.
- 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.
- 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.
- 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.
- 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.
- the shape of the stirring shaft 4 is substantially cylindrical has been described as an example.
- 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.
- 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.
- 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.
- a heating medium heated to a predetermined temperature in the jacket 16 is also preferable implementation of the present invention.
- the heat medium for example, warm water, steam, oil, or the like can be used.
- 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 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 si
- 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 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
- 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.
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Abstract
Description
まず、底板7の位置から上部ほど中心側に変位する傾斜面21が形成された容器(以下、円錐型容器)と、全体が直胴に形成された容器(以下、円筒型容器)とを用いて、分級回転数と回収された微細粉体の粒子径及び処理能力との関係を調べた。円錐型容器の傾斜面21は傾きが11度とされ、円錐型容器及び円筒型容器はいずれも底板7の直径が600mmのものを用いた。また、媒体6として直径5.0mmのスチールボールを用い、重質炭酸カルシウム(比表面積換算径:1.0μm)を粉砕原料として、流動気体、噴出気体、流入気体の総量である処理風量10m3/min、攪拌部材の回転数120rpmの運転条件で連続処理を行った。なお、分級ロータ10の分級回転数は3000rpm及び7000rpmとし、比表面積換算径はBET法により測定して求めるとともに、処理能力は単位時間当たりの処理量として求めた。その結果を表1に示す。
次に、底板7の直径が600mmの円錐型容器を用い、傾斜面21の傾きを鉛直方向に対して0度から35度の間で変化させて、傾斜面21の傾斜角度と粉砕効率との関係を調べた。なお、傾斜面21の傾きが0度のものは、比較例としての円筒型容器に相当する。媒体6として直径3mmのジルコニアボールを用い、タルク(平均粒子径:13μm)を粉砕原料として、処理風量10m3/min、攪拌部材の回転数120rpm、分級回転数7000rpmの運転条件で連続処理を行った。平均粒子径はレーザー回折散乱法により測定して求めるとともに、処理能力は単位時間当たりの処理量として求めた。また、粉砕効率は、処理能力を粉砕処理に要した動力の大きさで除して求めた。その結果を図4及び表2に示す。なお、表2においては、傾斜面21の傾きが0度の場合における粉砕効率に対する各傾斜角度での粉砕効率を粉砕効率比として示している。
次に、底板7の直径が600mmの円錐型容器を用い、攪拌軸4の上端面4uから分級ロータ10の下端面10dまでの空間に介挿部材12を設けたものと、設けないものとについて、分級回転数と回収された微細粉体の平均粒子径及び処理能力との関係を調べた。ここで、介挿部材12を設けない場合の攪拌軸4の上端面4uから分級ロータ10の下端面10dまでの距離Hは約300mmであり、介挿部材12を設ける場合には当該距離は同様とし、分級ロータ10の下端面10dと介挿部材12の上端面12uとの隙間を約10mmとした。また、媒体6として直径5.0mmのジルコニアボールを用い、ガラス粉(平均粒子径:33μm)を粉砕原料として、処理風量10m3/min、攪拌部材の回転数130rpmの運転条件で連続処理を行った。なお、分級ロータ10の分級回転数は3000rpm及び7000rpmとし、平均粒子径はレーザー回折散乱法により測定して求めるとともに、処理能力は単位時間当たりの処理量として求めた。その結果を表3に示す。
(1)上記の実施形態においては、傾斜面21が容器2内の底板7の位置から形成されており、全ての攪拌部材5の高さ位置における容器2の内壁が傾斜面21とされる場合を例として説明した。しかし、本発明の実施形態はこれに限定されない。すなわち、傾斜面21は、少なくとも最上段の攪拌部材5の下端面の高さ位置、又はそれよりも下方から上方に向けて形成されるように構成されていれば、複数段のうちの中間部における攪拌部材5の上端面又は下端面の高さ位置から形成されていても良く、つまり、必ずしも全ての攪拌部材5の高さ位置における容器2の内壁を傾斜面21としなくても良い。例えば、図5に示すように、容器2の形状を、容器2の底面から所定の高さ位置まで、底面に略直交する垂直面22とした直胴部を有する構成とすることができる。この場合、垂直面22から連続して傾斜面21が形成されることになる。また、図6に示すように、容器2の内壁が、上部ほど中心側に変位する傾斜面21(これを第一の傾斜面とする)に加えて、上部ほど外側に変位する第二の傾斜面23を有する構成としても良い。このとき、第二の傾斜面23は、底板7から最上段の攪拌部材5より下部のいずれかの高さ位置にまで至る構成とすることができる。この場合、第二の傾斜面23から連続して第一の傾斜面21が形成されることになる。
これらの場合にあっては、傾斜面21が容器2内の底板7の位置から形成される場合と比較して、容器2を大容量として処理能力を増大させることができるという利点がある。また、傾斜面21が底板7の位置から形成される場合と比較して、媒体6の浮き上がり抑制効果は多少低下するものの、媒体6や粉砕原料の滞留が比較的生じやすい容器2の底部の隅部において、媒体6の循環を促進することができるという利点がある。
また、分級機としては、分級ロータ10を用いないその他の分級機を用いても良い。
また、介挿部材12を攪拌軸4や分級ロータ10に連結させず、容器2から支持部材を用いて支持する構成としても良い。また、上記の実施形態においては、介挿部材12は上部ほど外径が小さくなる形状としているが、攪拌軸4の外径と分級ロータ10の外径に応じて、又は搬送気体の上昇速度をより速めるため、介挿部材12の外径を上部ほど大きくする、又は上下同径となる円筒状にするなど、適宜変更しても良い。
この場合における分級回転数と回収された製品粉体の平均粒子径及び処理能力との関係を表4に示す。なお、実験条件は上記の実験3におけるものと同様である。
2 容器
4 攪拌軸
5 攪拌部材
6 媒体
7 底板
10 分級ロータ(分級機)
12 介挿部材
13 気体噴出口
14 環状流路
21 傾斜面
Z 回転軸芯
Claims (5)
- 撹拌軸から一段又は複数段に亘って径方向外向きに突出する、縦軸周りに回転自在に設けられた攪拌部材を備え、
前記攪拌部材により容器内で被処理原料を媒体とともに攪拌して粉砕すると共に、前記容器内の上部に設けられた分級機を介して粉砕後の粉体を回収する媒体攪拌型粉体処理装置であって、
前記容器の内壁が、上部ほど中心側に変位する傾斜面を有するとともに、
前記傾斜面が、最上段の前記攪拌部材の下端面の高さ位置又はそれよりも下方から上方に向けて形成されている媒体攪拌型粉体処理装置。 - 前記傾斜面が、前記容器の底部から形成されている請求項1に記載の媒体攪拌型粉体処理装置。
- 前記攪拌部材は、前記撹拌軸に対して複数段に亘って設けられ、
前記攪拌軸の軸芯からの、最上段における前記攪拌部材の先端部までの長さが、その一段下の段における前記攪拌部材の先端部までの長さよりも短く設定されている請求項1又は2に記載の媒体攪拌型粉体処理装置。 - 前記攪拌軸の上端面と前記分級機の下端面との間に介挿部材を備えた請求項1から3のいずれか一項に記載の媒体攪拌型粉体処理装置。
- 前記容器の側面に周方向に沿って設けられ、径方向内向きに気体を噴出する気体噴出口を備えた請求項1から4のいずれか一項に記載の媒体攪拌型粉体処理装置。
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EP20090809693 EP2351616A4 (de) | 2008-08-25 | 2009-06-30 | Medienschüttelvorrichtung zur verarbeitung von pulver |
CN2009801324081A CN102131586A (zh) | 2008-08-25 | 2009-06-30 | 介质搅拌型粉体处理装置 |
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CN112691629A (zh) * | 2020-10-16 | 2021-04-23 | 卫红红 | 一种涂料加工用高温催化反应釜 |
EP3819575A3 (en) * | 2014-11-19 | 2021-09-08 | MinEx CRC Ltd | Drying apparatus |
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JP5898330B2 (ja) * | 2012-10-10 | 2016-04-06 | ホソカワミクロン株式会社 | 気流乾燥装置 |
JP6317891B2 (ja) * | 2013-05-29 | 2018-04-25 | 日本コークス工業株式会社 | 乾式メディア撹拌型粉砕機 |
CN104056694B (zh) * | 2014-06-20 | 2016-08-24 | 重庆环德科技有限公司 | 一种可实现精密分散的砂磨机 |
CN106732949B (zh) * | 2016-12-27 | 2018-09-18 | 安徽杨柳青钙业科技股份有限公司 | 一种增压动流式干粉搅拌粉碎装置 |
DE202017003318U1 (de) | 2017-06-23 | 2017-08-01 | Hosokawa Alpine Aktiengesellschaft | Rotor für Rührwerksmühlen |
CN108568237A (zh) * | 2018-04-16 | 2018-09-25 | 合肥图腾龙机械设计有限公司 | 一种饲料粉碎混合装置 |
CN109225465A (zh) * | 2018-10-11 | 2019-01-18 | 甘肃驰奈生物能源***有限公司 | 一种餐厨垃圾破碎、筛分、风选一体设备 |
CN109759184B (zh) * | 2019-02-19 | 2021-09-28 | 徐金涛 | 一种利用废旧成品皮革提取胶原纤维的方法及设备 |
KR102386275B1 (ko) * | 2021-11-19 | 2022-04-14 | 안태철 | 기류식 하부이동식 분급분쇄기 |
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EP3819575A3 (en) * | 2014-11-19 | 2021-09-08 | MinEx CRC Ltd | Drying apparatus |
CN112297269A (zh) * | 2020-10-09 | 2021-02-02 | 辛集市旭远新材料科技有限公司 | 一种环保轻量化工程塑料制备工艺 |
CN112297269B (zh) * | 2020-10-09 | 2022-05-13 | 青岛汇天隆工程塑料有限公司 | 一种环保轻量化工程塑料制备工艺 |
CN112691629A (zh) * | 2020-10-16 | 2021-04-23 | 卫红红 | 一种涂料加工用高温催化反应釜 |
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CN102131586A (zh) | 2011-07-20 |
KR101431045B1 (ko) | 2014-08-21 |
JP5451006B2 (ja) | 2014-03-26 |
KR20110065460A (ko) | 2011-06-15 |
KR20130111643A (ko) | 2013-10-10 |
EP2351616A4 (de) | 2013-03-06 |
EP2351616A1 (de) | 2011-08-03 |
JP2010046646A (ja) | 2010-03-04 |
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