JP6426494B2 - Granular material separation device and granular material separation method - Google Patents

Description

The present invention relates to a powder-particle separation device for separating a mixture of powder particles having different specific gravities or particle diameters by using an air stream. In particular, the present invention relates to a particulate separating apparatus capable of effectively crushing agglomerated particles to separate particulates with high accuracy, and applicable to various particulate mixtures including steelmaking slag. It is.
Further, the present invention relates to a method of separating powdery particles using the above-described powdery particle separation device.

  Separating powder particles from a mixture of powder particles according to physical properties is performed in various industrial fields, and is particularly high for an apparatus capable of separating powder particles with high accuracy. There is a demand.

For example, in the steel field, a method for separating particles contained in slag generated in a steelmaking line is required. In a steelmaking line, a residue called slag (steelmaking slag) is generated in a refining process such as hot metal pretreatment and a converter process. This slag mainly consists of oxides such as SiO ₂ , Al ₂ O ₃ and CaO, but also contains a large amount of iron particles. Among iron particles contained in slag, iron particles having a large particle size are reused as a cold iron source in the converter process.

  However, among iron particles contained in slag, little recycling is carried out for small-sized iron particles. This is because the slag contains impurity elements such as phosphorus and sulfur and is mixed with iron particles of small particle size. If iron particles are used as a cold iron source while these impurity elements are mixed, the refining process is inhibited. Therefore, in order to effectively utilize the iron particles in the steelmaking slag, it is necessary to separate the iron particles and particles composed of other components with high accuracy.

  In various fields such as the above-described steelmaking slag, studies on high-precision separation of fine particles have been conducted, and various methods have been proposed.

  For example, as a separation method using magnetic force, a method using a drum type magnet separator has been proposed. In this method, a mixture of granular materials is supplied onto a drum having a magnet inside, and separated into particles adsorbed on the drum surface and particles not adsorbed.

  Further, Patent Document 1 describes an air flow classification device that separates mixed particles containing fine powder and coarse powder using a swirling air flow. In this device, an air flow generated by a blower is blown into a cylindrical casing to generate a swirling air flow, and a particulate mixture is fed into the swirling air flow using a rotating dispersion plate. Of the fed granular material mixture, particles having a small particle size are discharged from the top in the air flow, and large particles are dropped and collected from the bottom.

  Patent Document 2 describes, in an air flow classification device that separates powder using a swirling air flow, erecting a plurality of pins on a rotary dispersion plate for feeding powder. In patent document 2, it is supposed that the powder fed in the agglomerated state is crushed by colliding with the pin while moving on the dispersion plate by the centrifugal force.

Unexamined-Japanese-Patent No. 2010-069393 Japanese Patent Application Publication No. 07-080413

However, the existing separation methods as mentioned above have some problems.
For example, although there are two types of separation methods using a drum type magnet separator, dry type and wet type, either type can be applied only to powder particles having a magnetic difference. In addition, in the case of separating a particle mixture having a small particle size with a dry drum type magnetic separator, when the magnetic powder is adsorbed to the drum, nonmagnetic powder is wound under the magnetic powder, so high separation accuracy is obtained. It is difficult. In the case of using a wet drum type magnetic separator, it is necessary to treat the generated waste liquid and to dry the powder after separation, which increases the processing cost.

  In the method described in Patent Document 1, coarse particles in which a plurality of fine particles are aggregated by the action of Van der Waals force, electrostatic attraction force, liquid crosslinking force, solid crosslinking force, etc., are carried in the air stream because of their size. It can not rise and falls. As a result, in the coarse particles collected from the lower side of the apparatus, the fine particles to be discharged from the upper side are mixed as aggregated particles, and the separation accuracy is lowered.

  According to the method described in Patent Document 2, if the number of pins is too large, the feed of the granular material is inhibited, and on the contrary, if the number of pins is too small, the distance between the pins becomes wide and the granular material fed. Most of them pass through the dispersion plate without colliding with the pins. In addition, since the feed granular material and the pin rotate at the same speed on the dispersion plate, the impact force required to break up the agglomerated particles is sufficiently obtained even if the particles come in contact with the pins. There is a problem of not being.

  The present invention has been developed in view of the above situation, and regardless of the magnetism of the particles, even if it is a powder or granular material containing a large number of agglomerated particles, the agglomerated particles are surely crushed and accurate. An object of the present invention is to provide a separable granular material separation device and a granular material separation method.

  As a result of intensive research conducted by the inventors in order to achieve the above object, the crushing blade is provided on the outer periphery of the dispersion plate, and the whole amount of the fed powder particles passes when the crushing blade rotates. It has been found that by passing a space (rotational area) to be used, it is possible to break up agglomerated particles with certainty. Further, by providing a gate member projecting inward from the inner wall surface of the casing above the crushing blade, high specific gravity particles and large particle based particles which should be recovered downward by the action of gravity are broken up originally It has been found that it can be effectively prevented from being mixed with low specific gravity particles and small particle diameter particles which are repelled upward by crushing blades and collected from above. The present invention is based on the above findings.

That is, the gist configuration of the present invention is as follows.
(1) With a cylindrical casing,
A feed pipe for feeding powdery particles into the casing;
A dispersion plate installed in the casing, receiving powder and granular material supplied from the feeding pipe on the upper surface thereof, rotating around an arbitrary axis, and dispersing the powder and granular material by centrifugal force;
A crushing blade which extends from a peripheral edge of the dispersion plate in a direction away from the axis and rotates around the axis to collide with powder particles dispersed by the dispersion plate;
Rotary vanes disposed in the casing and rotating about an arbitrary axis to generate a swirling updraft in the casing;
A gate member located at a height between the crushing blade and the rotating blade and extending from the inner wall surface of the casing toward the shaft;
The granular material separation device whose height of the lower end of the crushing blade is the same as the height of the upper surface of the dispersion plate, or lower than the height of the upper surface.

(2) The casing is a double casing having an inner casing and an outer casing,
The gate member extends from the inner wall surface of the inner casing,
The granular material separation device according to (1), having a guide vane below the dispersion plate of the inner casing.

(3) A particulate material separation method using the particulate material separation device according to (1) or (2),
Supplying the granular material through the input pipe onto the rotating dispersion plate,
Projecting the powder material toward the outside of the dispersion plate by centrifugal force;
The granular material separation method in which the whole quantity of the projected granular material passes through the space which passes when the crushing blade rotates.

  According to the granular material separation apparatus and the granular material separation method of the present invention, regardless of the magnetism of the particles, even if the granular material contains a large number of agglomerated particles, the agglomerated particles are reliably crushed, The particles contained in the powder can be separated with high accuracy. Such granular material separation apparatus and method are extremely useful for the separation of various granular materials including steelmaking slag.

It is a sectional view of the granular material separation device in one embodiment of the present invention. It is a top view of the crushing blade in one embodiment of the present invention.

Next, the method of practicing the present invention will be specifically described.
In the following description, terms such as upper, lower, horizontal and vertical are used to indicate the positional relationship when the particulate material separation device of the present invention is installed in an operating state.

  A granular material separation device according to the present invention comprises a cylindrical casing, a rotary dispersion plate horizontally installed in the casing, a crushing blade extending outward from a peripheral edge of the dispersion blade, and the dispersion plate. Located at a height between the crushing blade and the rotary blade, and from the inner wall surface of the casing to the axis And an extending gate member.

  The shape of the casing is not particularly limited, and may be cylindrical. In addition, in order to stably form the swirling rising air flow, it is preferable to make the horizontal direction cross section of the casing circular, but also in that case, the diameter of the circle may be different depending on the position in the height direction. In the case where the casing is a double casing having an inner casing and an outer casing, it is preferable that both the inner casing and the outer casing be cylindrical and arranged concentrically.

  By rotating the rotary vanes about an arbitrary axis in the cylindrical casing, a swirling updraft is generated in the casing. The arbitrary axis is an axis that becomes a weir axis when the particulate material separation device of the present invention is installed in the operating state, and means an arbitrary axis parallel to the height direction of the cylindrical casing. When the horizontal cross section of the casing is circular as in a cylindrical casing, it is preferable that the position of the shaft be the center of the circle. It is preferable that the attachment position of the said rotary blade is above the dispersing plate and crushing blade which are mentioned later. The shape of the rotary vanes is not particularly limited, and any blade that can generate a necessary updraft can be used.

  The granular material mixture to be treated is supplied through a feed pipe onto a dispersion plate provided inside the casing. The shape of the dispersion plate is not particularly limited, but is preferably circular (disk-like). The dispersion plate is rotatable about an arbitrary axis (a weir axis), similarly to the rotary vanes. The rotation axis of the dispersion plate may be different from the rotation axis of the rotary blade, but is preferably the same.

  The position on the dispersion plate to which the particles are supplied is not particularly limited, but is preferably substantially at the center of the upper surface of the dispersion plate. The particles supplied onto the dispersion plate move toward the outside of the dispersion plate by the centrifugal force generated by the rotation of the dispersion plate, and are ultimately projected toward the outside of the dispersion plate.

  The dispersing plate is provided with crushing blades which extend in the direction away from the rotation axis of the dispersing plate from the periphery thereof. The extending direction of the crushing blade may be a normal direction of the outer periphery of the dispersion plate, and may have an angle with respect to the normal direction. The crushing blade is configured to rotate around the weir axis together with the dispersing plate. It is preferable to arrange the dispersion plate, the crushing blade, and the rotating blade coaxially, since they can be rotated by a single drive device. At that time, it is more preferable to dispose the input pipe coaxially and use it as a shaft for driving, since the device structure can be simplified.

  In the present invention, it is important to dispose the crushing blade so that the height of the lower end of the crushing blade is the same as or lower than the height of the upper surface of the dispersion plate. . With such an arrangement, the whole amount of the powder and granular material that has jumped out of the dispersion plate by the centrifugal force passes through the rotation area of the crushing blade. At this time, by rotating the crushing blades at a high speed, it is possible to cause the particles to collide with the rotating blades at a high relative speed. As a result, even if agglomerated particles are present in the granular material, they are effectively crushed into primary particles (non-aggregated particles) by the impact at the time of collision.

  It is preferable that the lower end of the crushing blade is positioned above the upper end of a guide vane to be described later because the lower end of the crushing blade excessively lowers the air flow.

  Although the number of the rotating blades and the number of crushing blades is not particularly limited, it is preferably two or more, and more preferably four or more. Moreover, in order to ensure rotational balance, it is preferable to attach a plurality of blades at equal intervals in the circumferential direction.

  After colliding with the crushing blade, the granular material flies further outward and collides with the inner wall of the casing. Even if aggregate particles are not completely crushed and remain at the time after collision with the crushing blade, the remaining aggregated particles are further crushed by the collision with the inner wall of the casing. be able to.

  As mentioned above, the granular material crushed in two steps of collision with a crushing blade and collision with a casing inner wall is next separated by a swirling updraft generated by the above-mentioned rotating blade. The mass of the particle is proportional to its volume if the density is uniform, and thus proportional to the cube of the radius. On the other hand, the force that the particles receive from the air flow is proportional to the projected area of the particle, and thus to the square of the radius. As a result, in the case of particles having the same specific gravity, the effect of gravity is dominant for particles with a large radius and drops, and the effect of air flow is dominant for particles with a small radius and rises. Also, in the case of particles having the same particle size, particles with high specific gravity (heavy) fall, and particles with low specific gravity (light) rise on the air stream.

  Furthermore, in the device according to the present invention, a gate member extending from the inner wall surface of the casing toward the shaft is provided at a height between the crushing blade and the rotating blade. When the separation of particles is carried out as described above, depending on the physical properties of the particles, the form of the crushing blade, the state of the air flow, etc., some of the particles colliding with the crushing blade are not horizontal but upward There is a risk that it will be thrown away. However, since the gate member is provided above the crushing blade, the particles thrown upward collide with the gate member and are repelled downward. At that time, since the swirling rising air flow is formed by the rotating blades in the casing, particles having a small particle diameter and particles having a low specific gravity can rise on the air flow even if the gate member is present. On the other hand, particles having a large particle size and particles having a high specific gravity can not be carried by the air flow and drop downward as they are, so they are not mixed with particles having a small particle size and particles having a low specific gravity which rise in the air flow. Therefore, by providing the gate member, it is possible to separate particles with high accuracy.

  The shape of the gate member is not particularly limited, and may be any shape such as a plate or a block. Further, the number of gate members is not particularly limited, and may be one or two or more. The gate member is provided in the form of an eave (inward flange) so as to project from the inner wall surface of the casing. That is, the outer periphery of the gate member is in contact with the inner wall of the casing, while an opening exists on the center side of the gate member (the side far from the inner wall surface of the casing), and particles on the air flow pass through the opening Rise in the casing. For example, when a cylindrical casing is used, a ring-shaped disk having a circular opening at the center can be used as a gate member, and the diameter of the disk can be made equal to the inner diameter of the cylindrical casing. When a double casing is used as the casing, the gate member is provided so as to protrude from the inner wall surface of the inner casing.

  The height at which the gate member is provided is between the crushing blade and the rotating blade. In the case where there are a plurality of crushing blades, it is preferable to provide the gate member at a position higher than the crushing blade at the highest (closest to the rotating blades) position, but above each crushing blade, for example, The gate member may be provided so that the crushing blade and the gate member are alternately positioned. Further, in the case where there are a plurality of rotating blades, it is preferable to provide the gate member at a position lower than the rotating blade at the lowest (closest to the crushing blade) position. When using a double casing as a casing, it is preferable to make the height of a gate member below the upper end of an inner casing.

  According to the apparatus of the present invention, the aggregate particles are completely crushed using the crushing blade as described above, and the gate member prevents the particles thrown away by the crushing blade from being mixed upward Since the separation using the air flow is performed above, the particles can be separated with high accuracy based on the particle size, the specific gravity, or both, without depending on the magnetism of the particles.

  Next, an embodiment of the present invention will be specifically described based on the drawings. The following embodiment shows a suitable example of the present invention, and the present invention is not limited by the description at all. The embodiments of the present invention can be modified as appropriate within the scope of the present invention, and all are included in the technical scope of the present invention.

  A cross-sectional view of the granular material separation device in the present embodiment is shown in FIG. In this example, the casing has a double cylindrical shape consisting of an outer casing 1 and an inner casing 2. The outer casing 1 is in the form of a covered cylinder whose upper portion is closed, and the inner casing 2 is accommodated therein so as to be coaxial with the outer casing 1. Between the outer casing 1 and the inner casing 2 is provided a gap through which powder particles dispersed in the air flow can pass. The inner casing 2 has a cylindrical shape with an open top, and the inside of the inner casing 2 is provided with a feeding pipe 3, a dispersing plate 4 and a crushing blade 5.

  The feeding pipe 3 is a hollow cylinder and is vertically installed at the center of the casing so as to penetrate the top plate of the outer casing 1. The upper end of the feed pipe 3 is provided with powder and granular material supply means (not shown).

  A disc-shaped dispersion plate 4 is horizontally attached to the lower end of the feeding pipe 3. A space is provided between the lower end of the feed pipe 3 and the upper surface of the dispersion plate 4 for the granular material to pass through.

  The crushing blade 5 is provided on the outer peripheral portion of the dispersion plate 4. The crushing blade 5 may be directly attached to the dispersing plate, but in the present embodiment, the crushing blade 5 is fixed by using the crushing blade fixing plate 6 provided in the feeding pipe 3. The crushing blade fixing plate 6 is a disk-like member, and is mounted in parallel with the dispersing plate 4 with a fixed gap.

  FIG. 2 is a diagram showing the arrangement of the crushing blades 5 as viewed from above. As shown in this figure, the crushing blades 5 in the present embodiment consist of eight plate-like blades, and the blades are equally spaced in the circumferential direction so as to extend radially from the outer peripheral portion of the dispersing plate 5 Is attached to The crushing blade 5 rotates coaxially with the dispersion plate 4 and the crushing blade fixing plate 6 in the direction of the arrow shown in the figure. The shape of each blade constituting the crushing blade 5 is not particularly limited as long as it can collide with particles to give an impact. In the present embodiment, as shown in FIGS. 1 and 2, a vertical flat blade is used.

  The position of the crushing blade 5 in the height direction needs to be set so that all the powder particles that have jumped out of the dispersing plate 4 pass through the space through which the crushing blade 5 passes. If the lower end of the crushing blade is above the upper surface of the dispersing plate, the powder particles pass through the space without the crushing blade. In order to avoid this, it is necessary to make at least the height of the lower end of the crushing blade equal to the height of the upper surface of the dispersion plate or lower than the height of the upper surface. Similarly, with regard to the vertical width (height) of the crushing blade, it is necessary to determine all the powder particles to pass through the rotation region of the crushing blade.

  Above the crushing blade 5, a rotating blade 7 for generating an ascending air flow in the casing is provided. The rotary vanes 7 are, like the dispersion plate 5 and the crushing vanes 7, mounted coaxially with the feed pipe 3 and integrally rotatable around the weir axis.

  A gate member 8 is provided at a height between the crushing blade 5 and the rotating blade 7 so as to project from the inner wall surface of the inner casing 2 in the direction of the feeding pipe 3 which is the rotating shaft of the dispersion plate 4 . As shown in FIG. 1, the gate member 8 in the present embodiment is a plate-like member having an opening at the center, and is fixed so that the outer periphery thereof is in contact with the inner wall surface of the inner casing 2. The diameter of the opening at the center of the gate member 8 is substantially the same as the diameter of the dispersion plate 4.

  A variable speed motor 9 is installed at the upper part of the outer casing 1 and the shaft of the variable speed motor 9 is connected to the input pipe 3 by the drive belt 12 via the motor side pulley 10 and the input pipe side pulley 11 ing. As the drive belt 12, a general belt drive V-belt or the like can be used. Moreover, it can replace with the said belt drive system, and can also employ | adopt a chain drive system. In that case, a sprocket is used instead of the pulley, and a chain is used instead of the drive belt.

  In this embodiment, since the dispersion plate 4, the crushing blades 5, and the rotating blades 7 are driven by one variable-speed motor 9, they all rotate at the same speed, but gear change means such as gears These can also be rotated at different speeds using. Further, the dispersion plate 4, the crushing blades 5, and the rotating blades 7 may be rotated at different speeds by using a plurality of variable speed motors 9.

  Moreover, although one set of crushing blades 5 is used in the present embodiment, a second crushing blade may be further provided between the crushing blades 5 and the rotating blades 7.

  Below the inner casing 2, there is a portion (communication portion 13) communicating with the outside over the entire circumference, and a guide vane 14 is provided in the communication portion 13. The guide vanes have a function of rectifying the air taken into the inner casing 2 from the communication portion 14 to form a swirling air flow. As shown in FIG. 1, the communication portion 13 is provided below the dispersion plate 4 and the crushing blade 5. As a result, the air flow taken through the communicating portion 13 and the guide vanes 14 and taken into the inside of the inner casing 2 can be prevented from being directly blown to the crushing blades 5 to prevent the crushing of the agglomerated particles.

  At the lower part of the outer casing 1 a conical outer particle collecting part 15 is provided, the lower end of which is connected to the outer particle outlet 16. Similarly, at the lower part of the inner casing 2, a conical inner particle collecting portion 17 is provided, and the lower end thereof is connected to the inner particle outlet 18.

  Next, the operation of the granular material separation device of the present invention in the above embodiment will be described by taking the case of separation of steelmaking slag as an example.

  The steelmaking slag discharged from the converter or the like is cooled to a normal temperature, subjected to various pretreatments as necessary, and then supplied to the granular material separation device of the present invention. As the pretreatment, for example, a drying process can be performed when the steelmaking slag is water-cooled at the time of cooling, and a crushing process using a crusher can be performed when the adhesion between particles is large. The steelmaking slag is supplied to the upper end of the feeding pipe 3 using a chute or the like (not shown), falls inside the feeding pipe 3, and reaches the dispersing plate 4. Since the steelmaking slag has strong cohesiveness, at this point, it contains coarse agglomerates in which the particles are agglomerated, and it can not be separated with high precision as it is.

  Since the dispersion plate 4 is rotating at a high speed, the slag supplied onto the dispersion plate 4 moves toward the outside of the dispersion plate 4 by centrifugal force, and finally, the dispersion plate 4 and the crushing blade fixing plate 6 Jump out of the top of the dispersion plate 4 through the space between them. The slag projected from the dispersion plate 4 collides with the rotating crushing blade 5, and the aggregated particles are crushed into primary particles by the impact force at that time. In the present invention, it is important in this case to pass the whole amount of the granular material projected toward the outside of the dispersion plate through the space through which the crushing blade passes. In order to achieve such conditions, in the separation device of the present invention, the height of the lower end of the crushing blade is the same as or lower than the height of the upper surface of the dispersion plate. It is set. In addition, the width of the crushing blade in the vertical direction and the number of rotations of the dispersing plate, the crushing blade, and the rotating blade may be adjusted as necessary.

  Then, the slag colliding with the crushing blades is pushed outward and further crushed by collision with the inner wall surface of the inner casing 2. If there is no crushing blade, the speed is slow because the granular material is projected only by the centrifugal force caused by the rotation of the dispersion plate. Therefore, in that case, even if the slag collides with the inner wall surface, a sufficient crushing effect can not be obtained. However, in the apparatus of the present invention, slag particles are splashed by colliding with the crushing blades. Since the crushing blades are rotating at high speed, the velocity at their outer periphery is extremely high, and the velocity of particles splashed by the crushing blades is much greater than the velocity of particles projected only by centrifugal force . As a result, in the apparatus of the present invention, the crushing effect due to the collision with the inner wall surface of the casing is extremely high.

  As described above, in the present invention, the agglomerated particles can be reliably crushed through two steps of collision with the crushing blade and collision with the inner wall surface of the casing.

  A swirling updraft is formed inside the inner casing 2 by the action of the rotary vanes 7 and the guide vanes 14. The air flow ascends in the inner casing 2, then descends in the space between the outer casing 1 and the inner casing 2, passes through the communication portion 13 and the guide vanes 14, and returns again to the inner casing 2.

  The slag crushed by the crushing blade is next separated by the swirling updraft. That is, since the iron particles 19 contained in the slag have a large specific gravity, they fall below the inner casing 2 without getting on the updraft. The dropped iron particles are collected from the inner particle outlet 18 through the inner particle collection unit 17.

  On the other hand, since non-ferrous particles 20 which are particles mainly composed of components other than iron have a smaller specific gravity than iron particles, they are blown up by the rising air flow and move upward of the inner casing 2. After that, the non-ferrous particles 20 descend in the air flow through the space between the outer casing 1 and the inner casing 2 and are recovered from the outer particle outlet 16 through the outer particle recovery unit 15.

  At this time, depending on the conditions, some of the particles that collided with the crushing blades may be repelled upward rather than horizontally, and nonferrous iron from which iron particles that would otherwise be recovered from below will be recovered from above There is a risk of mixing in the particles. However, as described above, since the gate member 8 is provided above the crushing blade, the particles that are thrown upward collide with the gate member and are rebounded downward. As a result, it is possible to prevent iron particles from mixing in non-ferrous particles and lowering the separation accuracy.

  The rotational speeds of the dispersion plate 4, the crushing blades 5, and the rotating blades 7 are determined in consideration of the characteristics of the granular material to be treated, the shape and size of the apparatus, and the like. In the case of separation of steelmaking slag, the rotational speed may be, for example, 100 to 2000 rpm, preferably 300 to 1200 rpm.

  In this way, according to the particulate material separation device of the present invention, regardless of the magnetism of the particles, even the particulate material containing a large number of aggregated particles is reliably crushed and contained in the particulate material. Particles can be separated with high accuracy. In the above description, the separation of iron and steelmaking slag was taken as an example, but the powder and granular material separation apparatus of the present invention is not limited to steelmaking slag, and various powder and granular materials having different particle diameter and specific gravity or both. Available for separation of mixtures of

1: Outer casing 2: Inner casing 3: Input pipe 4: Dispersion plate 5: Crushed blade 6: Crushed blade fixed plate 7: Rotatable blade 8: Gate member 9: Variable speed motor 10: Motor side pulley 11: Input pipe Side pulley 12: Drive belt 13: Communication part 14: Guide vane 15: Outer particle collection part 16: Outer particle discharge port 17: Inner particle collection part 18: Inner particle discharge port 19: Iron particles (high specific gravity particles)
20: Non-ferrous particles (low specific gravity particles)

Claims (3)

With a cylindrical casing,
A feed pipe for feeding powdery particles into the casing;
A dispersion plate installed in the casing, receiving powder and granular material supplied from the feeding pipe on the upper surface thereof, rotating around an arbitrary axis, and dispersing the powder and granular material by centrifugal force;
The dispersion plate extends from the periphery of the dispersion plate in a direction away from the axis, and rotates around the axis to collide with the particles dispersed by the dispersion plate , and the particles are dispersed in the casing Crushing blades that are crushed by colliding with the inner wall surface of the
Rotary vanes disposed in the casing and rotating about an arbitrary axis to generate a swirling updraft in the casing;
A gate member located at a height between the crushing blade and the rotating blade and extending from the inner wall surface of the casing toward the shaft;
The gate member is provided in an inward flange shape at a position below the upper end of the casing so as to project from the inner wall surface of the casing, and the outer periphery of the gate member is in contact with the inner wall of the casing
The granular material separation device whose height of the lower end of the crushing blade is the same as the height of the upper surface of the dispersion plate, or lower than the height of the upper surface. The casing is a double casing having an inner casing and an outer casing,
The gate member extends from the inner wall surface of the inner casing at a position below the upper end of the inner casing.
The granular material separation device according to claim 1 which has a guide vane below said distribution board of said inner casing. A method of separating particulates using the device for separating particulates according to claim 1 or 2,
Supplying the granular material through the input pipe onto the rotating dispersion plate,
Projecting the powder material toward the outside of the dispersion plate by centrifugal force;
The granular material separation method in which the whole quantity of the projected granular material passes through the space which passes when the crushing blade rotates.

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