JP4556177B2 - Granulation method and granulation apparatus - Google Patents

Description

  The present invention relates to a granulation method and a granulation apparatus for producing a granulated product of fine powder.

Conventionally, as a method (apparatus) for producing a granulated product of fine powder, a granulated raw material and an additive solution are continuously supplied to an inclined bottomed cylindrical granulation dish, and the granulation dish is rotated to produce a granulated product. A granulating method (apparatus) for granulating is known. According to this granulation method (apparatus), a powdery granulation raw material and, for example, water or an additive liquid in which a flocculant or a binder is added to water are supplied to an inclined granulation dish, and the granulation dish is rotated. It is lifted by the accompanying centrifugal force, granulated by dropping downward due to its own weight, and grown to a granulated product of a predetermined particle diameter, and the formed grains grown can be discharged by overflow (for example, patent document) 1).
Japanese Patent Laid-Open No. 10-174859 (Claims, FIG. 1)

  However, in the technique described in Japanese Patent Application Laid-Open No. 10-174859, the granulated product discharged from the granulation dish by one treatment has a small particle size other than the formed particles (product particles) having a predetermined particle size. There is a possibility that fine particles, powder, and coarse particles having a particle size larger than a predetermined particle size are mixed. Therefore, the granulated product discharged from the granulation dish is classified and separated into three types of product and fine particles, powder and coarse particles. After being transported by a device using power different from that of the granulating device, it is granulated again and reprocessed to become product particles. The coarse particles are transported by a device using power different from a granulator such as a conveyor, and then returned to the previous drying / crushing step for reprocessing.

  Therefore, this type of conventional granulation method (equipment) requires a classification device immediately after the granulation is discharged, and also requires extra energy such as transportation for reprocessing of fine particles, powder and coarse particles. Thus, there is a problem in that the processing efficiency is lowered and the apparatus is enlarged.

  The present invention has been made in view of the above circumstances, and an object thereof is to provide a granulation method and a granulation apparatus capable of improving processing accuracy and processing efficiency and reducing the size of the apparatus. It is.

  In order to achieve the above object, the present invention is configured as follows.

The granulation method according to the invention of claim 1 is a granulation method in which a granulation raw material and an additive liquid are continuously supplied to an inclined granulation dish, and the granulation dish is rotated and granulated. And partitioning into a growth area on the bottom side and a formation area on the opening side by an annular partition wall protruding from the inner peripheral surface of the granulation dish, and supplying the granulation raw material into the growth area A granulated product is generated, and the granulated product generated in the growth region is arranged across the formation region and the growth region, and is formed and selected into a formed particle of a predetermined particle size and other particle sizes. Grains are taken out into the formation zone, and a granulated product having a particle size equal to or smaller than the grain size of the formed grains is supplied to the classifying means for returning to the growth zone. A granulated product having the following particle size is circulated in the growth zone to produce a granulated product, and the granulated product generated in the growth zone is again raised by the granule conveying means . It is characterized in that it is repeatedly carried out by supplying to the classification means and taking out the granulated product into the formation zone.

  The invention according to claim 2 is the granulation method according to claim 1, wherein an additive liquid is supplied to the granulation raw material in the growth region to bond the granulation raw materials together to produce a granulated product, An additive liquid is supplied to the granulated product to reinforce it with the liquid adhering to the granulated product.

  A granulating apparatus according to a fourth aspect of the present invention embodies the granulating method according to the first aspect of the present invention, wherein the granulating raw material and the additive liquid are continuously supplied to an inclined granulating dish. A granulation apparatus for granulating by rotating the granulation dish, comprising a growth region on the bottom side and a formation region on the opening side, which are partitioned by an annular partition wall projecting on the inner peripheral surface The plate is disposed across the formation region and the growth region, and is sorted into a formation particle having a predetermined particle size and a particle size other than that, and the formation particle is taken out to the formation region, and is equal to or less than the particle size of the formation particle. A classifying means for returning the granulated product having a particle size to the growth zone, and a granulated product for taking out the granulated product generated in the growth zone as the granulation dish rotates and supplying the granulated product to the classifying means. And a conveying means. In this case, the shape of the granulating dish may be any shape, for example, any of a bottomed cylindrical shape, a conical shape, or a truncated cone shape, preferably a truncated cone shape. Better.

  A fifth aspect of the present invention embodies the granulation method according to the second aspect of the present invention. In the granulation apparatus according to the fourth aspect, the additive liquid is supplied to the granulation raw material in the growth zone. 1 liquid supply means, and the 2nd liquid supply means which supplies an additional liquid to the granulated material in the said formation area, It is characterized by the above-mentioned.

  The invention according to claim 6 is the granulating apparatus according to claim 4 or 5, wherein the classifying means comprises a plurality of sorting holes in which the growth region portion is slightly smaller in diameter than the formation particle size, and the formation region portion is the formation particle. The cylindrical sieve is formed of a cylindrical sieve having a plurality of holes having the same diameter as the diameter, and the cylindrical sieve is inclined downward toward the outside in the axial direction of the cylindrical sieve, and is rotatable about the axis. A granulated product having a predetermined particle size or more formed and classified by the cylindrical sieve is formed so as to be discharged to the outside through the cylindrical sieve.

  According to a seventh aspect of the present invention, the granulated material conveying means is mounted on the annular partition wall of the granulating dish, scoops up the granulated substance generated in the growth zone as the granulating dish rotates, and And a guide chute that receives the granulated material dropped from the transport member and guides it into the cylindrical screen.

  In the present invention, the granulation raw material may be any fine powder as long as it is fine, and for example, alumina powder can be applied.

  According to the present invention, the following excellent effects can be obtained.

  (1) According to the first and fourth aspects of the present invention, the granulation raw material is supplied into the growth zone partitioned from the formation zone in the inclined granulation dish, and the granulated product generated in the growth zone is granulated. Supply to the classification means for selecting the growth grains with a predetermined particle size and other particle sizes by the particle conveying means and take out the formed particles into the formation area, The granulated product generated in the growth zone is repeatedly circulated to the classification zone by supplying the granulated product again to the classification means by the granule transport means, and repeatedly taking out the granulated product to the formation zone, A granulated product (product grain) having a predetermined particle size with high processing accuracy can be granulated. In addition, since a granulated product (product grain) having a predetermined particle diameter can be granulated in the granulation dish, the processing accuracy and efficiency of granulation can be improved, and the apparatus can be downsized.

  (2) According to the inventions of claims 2 and 5, an additive solution is supplied to the granulation raw material in the growth region partitioned in the granulation dish to bond the granulation raw materials together to produce a granulated product. In addition to the above (1), the processing accuracy and the processing efficiency can be further improved by supplying the additive liquid to the granulated material in the forming region and reinforcing the granulated material with the adhering liquid. Can do.

  (3) According to the invention described in claim 6, the classifying means has a large number of selection holes whose growth region part is slightly smaller in diameter than the formation particle size, and the formation region part has many formations having the same hole diameter as the formation particle size. A cylindrical sieve having a hole is formed, and the cylindrical sieve is arranged in a downward gradient toward the outside, and is rotated around an axis and granulated with a particle size equal to or larger than a predetermined particle size classified by the cylindrical sieve. By discharging the product to the outside through the inside of the cylindrical sieve, the granulated product supplied into the cylindrical sieve is dispersed while moving in the cylindrical sieve to form formed particles and other granulated products. Can be classified. Therefore, in addition to the above (1) and (2), the processing accuracy and processing efficiency can be further improved.

  (4) According to the invention described in claim 7, the granulated material transporting means is attached to the annular partition wall of the granulating dish, and scoops the granulated material generated in the growth zone as the granulating dish rotates. The conveying member is granulated by comprising a conveying member that is taken and dropped to the growth area side of the cylindrical sieve, and a guide chute that receives the granulated material dropped from the conveying member and guides it into the cylindrical sieve. The granulated product rotated in accordance with the rotation of the dish and generated in the growth region can be scooped up, and the scrubbed granulated product can be reliably supplied to the classification means via the guide chute. Therefore, in addition to the above (1) to (3), the processing accuracy and processing efficiency can be further improved.

  (5) According to the third and eighth aspects of the invention, alumina having a uniform particle diameter can be continuously granulated from the alumina powder.

  DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the best embodiment of the present invention will be described in detail with reference to the accompanying drawings.

  FIG. 1 is a schematic sectional view showing an example of a granulating apparatus according to the present invention. Here, an alumina granulator will be described.

  The granulation apparatus is provided with a growth area 12 on the bottom side and a formation area 13 on the opening side, which are arranged with an inclination with respect to the vertical direction and are partitioned by an annular partition wall 11 protruding from the inner peripheral surface. A rotatable granulation dish 10, a raw material supply nozzle 20 for supplying alumina powder as a granulation raw material into the growth area 12 of the granulation dish 10, and an additive liquid (for example, water) in the growth area 12 and the formation area 13, respectively. ) And the second liquid supply means 31 and 32 (hereinafter referred to as the first and second spray nozzles 31 and 32), the formation region 13 and the growth region 12, and are arranged in a predetermined manner. A cylinder which is a classifying means for sorting out the formed particles having a particle size of 5 mm and other particle sizes, taking out the formed particles into the forming region 13, and returning the granulated material having a particle size equal to or smaller than the formed particle size to the growing region 12. Grown granulated product A, which is arranged in the sieve 40 and the granulating dish 10 and generated in the growth zone 12 Is mainly composed of a granulated substance conveying means 50 for supplying a tubular sieve 40 is removed from the 12.

  The granulation dish 10 is formed in a frustoconical shape and is rotatably provided by a motor 7. In this case, as shown in FIG. 4 and FIG. 5, a rotation transmission unit 3 capable of changing the rotation direction is placed on the gantry 1 via the mounting member 2, and on the output side of the rotation transmission unit 3, A rotating shaft 14 protruding from the bottom of the granulating dish 10 is connected. Further, a driven pulley 4 is mounted on the input side of the rotation transmitting unit 3, and a transmission belt 6 is hung on the driven pulley 4 and a driving pulley 5 mounted on a driving shaft 7a of a motor 7 mounted on a gantry. The rotation direction is changed by the rotation transmission unit 3 and the drive from the motor 7 is transmitted to the rotating shaft 14 and the granulating dish 10.

  As shown in FIG. 1, the raw material supply nozzle 20 is connected to a raw material storage tank 21 via a supply line 22 having an open / close valve V1.

  The first and second spray nozzles 31 and 32 spray the additive liquid toward the granulated product A in the growth region 12 or the granulated product A in the formation region 13 with air, which is a gas for pumping, for example. It is formed by a two-fluid nozzle. In this case, the first and second spray nozzles 31 and 32 have an additive liquid supply path 35 in communication with an air supply path 34 that communicates with the nozzle hole 33, as shown in FIG. An air supply source 37 is connected to the supply path 34 via an air supply line 36 having an opening / closing valve V2, and added to an additive liquid supply path 35 via an additive liquid supply line 38 having an opening / closing valve V3. A liquid supply source 39 is connected.

  According to the 1st spray nozzle 31 comprised as mentioned above, by supplying an additive liquid to the alumina powder which is the granulation raw material supplied in the growth area | region 12 of the rotating granulation dish 10, by spraying. The granulated product A can be produced by bonding alumina powders together. Further, according to the second spray nozzle 32, the additive liquid can be supplied to the granulated product A in the formation region 13 in a spray form, whereby reinforcement by the adhering liquid component on the granulated product A can be performed.

  In the above description, the case where the first and second spray nozzles 31 and 32 are formed by two-fluid nozzles has been described. However, the first and second spray nozzles 31 and 32 are not necessarily two-fluid nozzles. There is no need, and a single fluid nozzle may be used. Further, instead of the spray nozzles 31 and 32, liquid supply means for supplying the additive liquid may be used.

  The cylindrical sieve 40 has a cylindrical sieve body in which the growth region portion has a large number of selection holes 42 having a diameter slightly smaller than the formation particle size, and the formation region portion has a large number of formation holes 43 having the same diameter as the formation particle size. The granulated product (coarse particles) having a predetermined particle size or more classified by the cylindrical sieve 40 can be discharged to the outside through the cylindrical sieve 40. Further, the cylindrical sieve 40 is disposed in a downward gradient in the axial direction of the cylindrical sieve 40 toward the outside, and is formed to be rotatable about the axis. In this case, as shown in FIG. 6, an annular member 44 is attached to the outer side end portion of the sieve body 41, and a plurality of connecting members 45 protruding at appropriate intervals in the circumferential direction of the annular member 44 are provided. The circular plates 46 are connected to each other, and a granulated product (coarse particles) having a predetermined particle diameter or more is discharged from the opening 47 formed between the connecting members 45 to the outside. In addition, a sieving rotary shaft 48 projects from the center of the disc 46, and is installed on a driven pulley 8a attached to the sieving rotary shaft 48 and a fixed part (not shown) in the apparatus. A transmission belt 9 is stretched around a drive pulley 8b attached to a drive shaft 7b of the cylindrical sieve rotating motor 7A.

  The cylindrical sieve 40 is configured to be rotated in the same direction as the rotation direction of the granulating dish 10. Thus, by making the rotation direction of the cylindrical sieve 40 the same direction as the rotation direction of the granulating dish 10, it is classified (sorted) with the rotation of the cylindrical sieve 40 and falls into the formation zone 13. Since the granulated product A (formed granule) falls with the rotation of the cylindrical sieve 40, it is possible to suppress the collision with the granulated product in the formation region of the granulating dish 10 rotating in the same direction. It is possible to prevent scattering to the outside.

  On the other hand, the granulated material conveying means 50 is attached to the annular partition wall 11 of the granulating plate 10 and scoops up the granulated material A generated in the growth region with the rotation of the granulating plate 10 to obtain a cylindrical sieve. 40 is mainly composed of a conveying member 51 that drops to the growth region side 40 and a guide chute 52 that receives the granulated material A dropped from the conveying member 51 and guides it into the cylindrical sieve 40.

  In this case, as shown in FIG. 3, the conveying member 51 includes substantially rectangular side pieces 53 and 54 that face each other, and a substantially rectangular inclined connecting piece 55 that connects one ends of both side pieces 53 and 54. It is formed by a substantially U-shaped piece member. In this case, one side piece 53 of the side pieces 53, 54 is formed longer than the other side piece 54, and is bonded to the growth region side surface of the annular partition wall 11 by an adhesive means such as a magnet or a double-sided adhesive tape. Has been. Further, a bent piece 56 is formed at the tip of the other side piece 54 so as to be bent at a substantially right angle toward the side piece 53 side. A plurality of, for example, three conveying members 51 are attached to the annular partition wall 11 at an appropriate interval.

  The conveying member 51 configured as described above has a side piece 53 bonded so as to open in the rotation direction of the granulation dish 10, and the granulation generated in the growth region 12 as the granulation dish 10 rotates. The product A is sowed and the granulated product A that has been scooped up can be dropped from the upper part to the growth region side of the cylindrical sieve 40. In this case, the material of the conveying member 51 may be arbitrary, but it is necessary to select a material that is not affected by the granulating material or the additive liquid. For example, when spraying an acidic liquid, it is necessary to use a material having acid resistance.

  The guide chute 52 has a hopper 57 that expands upward, a drooping duct 58 that communicates with the lower end of the hopper 57, and a bent opening that communicates with the lower end of the drooping duct 58 to open the tip of the cylindrical sieve 40. It is comprised with the supply duct 59 inserted and arrange | positioned in a part.

  As described above, the granulated product A is transported by the conveying member 51 and the guide chute 52 to convey the granulated product A granulated in the growth region 12 as the granulating dish 10 rotates. The granulated material A picked up by the member 51 and moved upward, and the conveying member 51 turned upside down at the upper position and dropped is dropped into the hopper 57 of the guide chute 52, and is passed through the hanging duct 58 and the supply duct 59. It can be reliably supplied into the cylindrical sieve 40.

  Next, the procedure of the granulation method according to the present invention will be described. First, the open / close valve V1 is opened and the granulated raw material stored in the raw material storage tank 21 is supplied into the growth region 12 of the granulating dish 10 rotating through the raw material supply nozzle 20. The granulation raw material supplied into the growth zone 12 is lifted by the centrifugal force accompanying the rotation of the granulation dish 10, granulated by dropping downward by its own weight, and supplied from the first spray nozzle 31. It grows into a granulated product A having a predetermined particle size by adhering to each other with the additive solution. At this time, since the granulation dish 10 is formed in a frustoconical shape, the granulation raw material can smoothly move to the annular partition wall 11 side by the centrifugal force accompanying the rotation of the granulation dish 10.

  The granulated product A grown to a predetermined particle size in the growth zone 12 is scooped up by a conveying member 51 that rotates with the rotation of the granulating dish 10 and then guided from an upper position in the granulating dish 10. 52 falls into the hopper 57 of 52 and is supplied into the cylindrical sieve 40 through the hanging duct 58 and the supply duct 59.

  At this time, since the cylindrical sieve 40 is inclined downward and rotating outward, the granulated product A supplied into the cylindrical sieve 40 is cylindrical while being dispersed in the circumferential direction. The sieve 40 moves in a substantially spiral shape from one end on the inner side to the other end on the outer side. In this movement process, first, the granulated product A having a diameter smaller than the formed particle size passes through the sorting hole 42. After returning to the growth area 12, the granulated product A having the same diameter as the formation particle diameter passes through the formation holes 43 and is taken out into the formation area 13. Since the additive liquid is supplied from the second spray nozzle 32 to the granulated product A taken out into the formation zone 13, the granulated product A is reinforced by the adhering liquid. The granulated product A (coarse particles) having a particle size larger than the formed particle size passes through the cylindrical sieve 40 and is discharged to the outside through the opening 47 at the outer end of the cylindrical sieve 40.

  By continuously rotating the granulation dish 10 and the cylindrical sieve 40, the above steps are performed continuously, so that the granulated product having a predetermined particle size or less returned into the growth region 12 is grown again. Then, it is scooped by the conveying member 51 and supplied into the cylindrical sieve 40 through the guide chute 52 in the same manner as described above, and is classified (selected) by the cylindrical sieve 40. Thereafter, similarly, a granulated product having a predetermined particle size or less is circulated to produce a granulated product A (formed particle) having a predetermined particle size. The granulated product A (formed granule) taken out into the forming area 13 is accommodated in the formed granule storage tank 70 and is carried out from the granulating apparatus.

  The granulated product (coarse particles) having a predetermined particle diameter or more discharged from the cylindrical sieve 40 to the outside is stored in the coarse particle storage tank 71 and pulverized again by the crushing device, and then the raw material. It is accommodated in the storage tank 21 and granulated again by a granulating device.

  In addition, although the said embodiment demonstrated the case where the granulation apparatus (method) based on this invention was applied to granulation of alumina, it is applicable also to granulation of granules other than alumina.

  Next, an experiment for producing a granulated product using the granulating apparatus (method) according to the present invention will be described.

<Experimental conditions>
Raw material: Lawsoda alumina (LS-110) {manufactured by Nippon Light Metal Co., Ltd.}
Particle size: 1.37 μm, specific surface area: 2.0 m ² / g
Test equipment a) Example: Granulation dish size: 900 mmφ outside, 435 mmφ inside × 400 mmH,
Vane feeder,
B) Comparative example: granulated dish size; 900 mmφ outside, 435 mmφ inside × 400 mmH,
Without annular partition and rotating cylindrical sieve,
Vane feeder ・ Operating conditions a) Example: Continuous raw material input amount: 10-15 kg / h,
Water supply amount: 0.5 to 3 kg / h nozzle 2
Granulation dish rotation speed: 15-20 rpm, granulation dish inclination angle: 53 °
b) Comparative example: continuous raw material input amount: 10-15 kg / h,
Water supply amount: 0.5-3 kg / h / nozzle × 1,
Granulation dish rotation speed: 15-20 rpm, granulation dish inclination angle: 53 °
When the experiment was conducted under the above conditions, the results shown in Table 1 were obtained.

  As a result of the above experiment, in the examples, the yield of the granulated product having a particle size larger than 3.00 mmφ was 1%, which was in the range of the peeling scale in the granulating dish that could be almost ignored. The yield of the granulated product having a particle size of 2.36 to 3.00 mmφ is 7%, the yield of the granulated product having a particle size of 2.00 to 2.36 mmφ is 50%, and the particle size is 1.70. The yield of the granulated product having ˜2.00 mmφ was 41%, and the yield of the granulated product having a particle size of 1.40 to 1.70 mmφ was 1%. The yield of the granulated product having a particle size smaller than 1.40 mmφ was 0. In the examples, a granulated product having a sharp particle size distribution with an average particle size of about 2 mmφ could be obtained.

  On the other hand, in the comparative example, the yield of the granulated product having a particle size larger than 3.00 mmφ is 5%, the yield of the granulated product having a particle size of 2.36 to 3.00 mmφ is 6%, and the particle size is The yield of granulated product with 2.00 to 2.36 mmφ is 5%, the yield of granulated product with particle size of 1.70 to 2.00 mmφ is 36%, and the granulated product with granule size of 1.40 to 1.70 mmφ The yield of the product was 23%, and the yield of the granulated product having a particle size of 1.00 to 1.40 mmφ was 11%. The yield of the granulated product having a particle size smaller than 1.00 mmφ was 15%. In the comparative example, a granulated product having a broad particle size distribution including those having a particle size smaller than 1.00 mmφ to larger than 3.00 mmφ is obtained, and the substantially uniform particle size as in the example is obtained. It is difficult to obtain a granulated product having

It is a schematic sectional drawing which shows an example of the granulation apparatus which concerns on this invention. It is a schematic sectional drawing which shows an example of the spray nozzle of the granulation apparatus which concerns on this invention. It is a perspective view which shows the conveyance member in this invention. It is a side view of the granulation apparatus which shows a part of granulation dish in this invention in a section. It is a front view of the granulation apparatus which shows the principal part of the said granulation dish in a cross section. It is a side view which shows a part of cylindrical sieve in this invention in a cross section.

Explanation of symbols

A granulated product 7 granulating dish rotating motor 7A cylindrical sieve rotating motor 10 granulating dish 11 annular partition wall 12 growth zone 13 forming zone 20 raw material supply nozzle 31 first spray nozzle (first liquid supply means)
32 Second spray nozzle (second liquid supply means)
40 Cylindrical sieve (classification means)
42 Sorting hole 43 Formation hole 50 Granulated material conveying means 51 Conveying member 52 Guide chute

Claims (8)

A granulation method in which a granulation raw material and an additive solution are continuously supplied to an inclined granulation dish, and the granulation dish is rotated and granulated,
An annular partition wall protruding from the inner peripheral surface of the granulation dish is partitioned into a growth area on the bottom side and a formation area on the opening side, and the granulation raw material is supplied into the growth area for production. Granules are produced, and the granulated product produced in the growth zone is arranged across the formation zone and the growth zone, and is classified into a grain having a predetermined grain size and a grain size other than that, and a grain to be formed To the forming zone, and supply a granulated product having a particle size equal to or smaller than the particle size of the formed particle to the classifying means for returning to the growth zone. A granulated product having a particle size of 2 is circulated in the growth zone to produce a granulated product, and the granulated product generated in the growth zone is supplied again to the classification means by the granulated product conveying means . The granulation method is characterized in that the step of taking out the material into the forming region is repeated. The granulation method according to claim 1,
An additive liquid is supplied to the granulated raw material in the growth zone to form a granulated product by bonding the granulated raw materials to each other. A granulation method characterized by performing reinforcement by minutes. In the granulation method according to claim 1 or 2,
A granulation method wherein the granulation raw material is alumina powder. A granulating apparatus for continuously supplying a granulation raw material and an additive liquid to an inclined granulation dish and rotating the granulation dish to granulate,
A granulation dish having a growth area on the bottom side and a formation area on the opening side defined by an annular partition wall projecting from the inner peripheral surface;
Arranged across the formation area and the growth area, the formed grains having a predetermined particle size and other particle sizes are selected, and the formed particles are taken out to the formation region, and the particle diameter is equal to or smaller than the particle diameter of the formed particles. A classifying means for returning the granulated product to the growth area;
A granulating material conveying means for taking out the granulated material generated in the growth area with the rotation of the granulating dish and supplying it to the classification means; . The granulating apparatus according to claim 4, wherein
A first liquid supply means for supplying an additive liquid to the granulation raw material in the growth area; and a second liquid supply means for supplying an additive liquid to the granulated material in the formation area, Granulating equipment to do. In the granulating apparatus according to claim 4 or 5,
The classification means is formed by a cylindrical sieve having a large number of selection holes whose growth region part is slightly smaller than the formation particle diameter, and the formation region part having a large number of formation holes having the same hole diameter as the formation particle diameter,
The above-mentioned cylindrical sieve is formed so as to be inclined downward toward the outside in the axial direction of the cylindrical sieve, and is formed to be rotatable around the axis, and is a granulated product having a predetermined particle size or more classified by the cylindrical sieve. Is formed so that it can be discharged to the outside through the inside of a cylindrical sieve. In the granulation apparatus according to any one of claims 4 to 6,
The granulated material conveying means is attached to the annular partition wall of the granulating dish, scoops up the granulated material generated in the growing area as the granulating dish rotates, and falls to the growing area side of the cylindrical sieve. A granulating apparatus comprising: a conveying member to be moved; and a guide chute that receives the granulated material dropped from the conveying member and guides the granulated material into the cylindrical sieve. The granulation device according to any one of claims 4 to 7,
A granulating apparatus, wherein the granulating raw material is alumina powder.

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