JPS5949838A - Method and device for granulation - Google Patents

Abstract

PURPOSE:To form granules having uniform grain sizes with good efficiency and high yield by feeding hot air to a granulation chamber through multilayered plates formed by uniting many concentrically disposed annular plates having different diameters to one body by spacing the plates from each other above and below. CONSTITUTION:The multilayered plates 2 provided in a granulation chamber consists of many annular plates 4 of different diameters which are disposed in the concentrical layers of the diameters increasing toward the lower part and are united to one body after the plates 4 are spaced from each other above and below by means of a suitable number of spacers 5 disposed circumferentially equidistantly. How air is supplied from a supply hole 20 and is fed through the plates 2 into the granulation chamber. The plates 2 are rotated at a prescribed speed, and powder is charged from above into the granulation chamber, then a binder soln. is sprayed and the powder is granulated. The hot air blowing out through the plates 2 flows in a centrifugal direction and the rotating direction of the plates 2, thus generating circumnutating gaseous flow and centrifugal gaseous flow. The uniform mixing of the charged powder and particles is thus effected, whereby the spherical granules having roughly specified grain sizes are obtd. The hot air is removed by a discharging means 50.

Description

DETAILED DESCRIPTION OF THE INVENTION This invention provides: - obtaining granules or granules of a desired diameter by spraying a binder solution onto the powder while fluidizing it; The present invention relates to a granulation method and apparatus capable of forming a desired coating film on the granules.

Conventionally, in this type of granulation equipment, a perforated plate with a number of holes is fixed at the bottom of the granulation chamber, and hot air is supplied from below the fixed perforated plate and blown above it. While the powder in the grain chamber is made to flow only in the vertical direction, a binder solution is sprayed on it, and the powdered particles are agglomerated in the sprayed droplets and dried to obtain granules or granules. There is something like this.

In this conventional fluidized bed granulation method, the spraying speed (
There is an advantage that particle nuclei can be formed almost uniformly by adjusting the size and size of the spray droplets. Due to these differences, there is a problem in that the powder size distribution of the granulated product often varies.

At the same time, products made using the conventional fluidized bed granulation method are subject to external forces that only move the powder in the vertical direction during the granulation process, and the particle size is grown without being affected by the hot air flow blown up from below. , the particles are porous and irregularly shaped with many convex curves on the surface. This is both an advantage and a disadvantage from a product perspective, but it is not suitable for cases where granules that are not porous and have a high apparent specific gravity (bulk specific gravity) and are required are high in density. Granules or granules with high density are then pressed into molded products, such as electronic parts such as ferrite, and granules used as materials for pharmaceutical tablets have a high bulk density.
Moreover, it is required to have a surface that is almost spherical and has good sliding properties, and from this point of view, conventional fluidized bed granulation methods cannot provide a satisfactory product.

As described above, various granulation methods have been proposed in the past, but there is no method (6) for arbitrarily changing the properties of the resulting granules.

In addition, since the powder is granulated to the required size while being blown upwards on a perforated plate, if there is insufficient wind pressure, etc. Due to the phenomenon of extraction, it becomes impossible to obtain a completely agitated fluidized bed of powder, and in some cases, excessively large particles are formed, while in other cases, the particles do not grow to the required diameter, resulting in extremely porous particles. There was a drawback that some of the powder or small-diameter particles fell through the holes in the plate, making it impossible to obtain the required granulation effect and deteriorating the quality.

Therefore, it is necessary to set the air volume, air pressure, etc. of the gas supplied into the granulation chamber to considerably high values.

However, on the other hand, it is necessary to exhaust the gas inside the granulation chamber to the outside of the equipment while collecting the dust floating therein with a bag filter. Dust adheres strongly to the bag filter and tends to clog it. Moreover, if the gas body is hot air, the consumption of heating energy increases. From this point of view, it is more convenient for the amount of the gas to be small.

With the diversification of granulation, it has become popular to arbitrarily control the properties of granules in a single container and to perform coating with a desired coating agent. In addition to the conventional simple granulation operation, the concept of granulation includes a coating operation, and for this purpose, fluidized bed granulation, coating equipment using a granule rolling method, etc. have been proposed. ,1
There is no device that can perform everything from granulation to coating in one vessel.

In other words, in the fluidized bed granulation method, the resulting granules are porous and light with a high porosity between aggregated particles, and the particle size distribution and shape are uneven, so even if coating is performed, the shape and particle size distribution will be uneven. Although it is uniform, there is a disadvantage that large variations occur even in +1 coat m of the coating material.

When coating using the Toyoda Transfer method, the coating material is deposited in a snowball manner based on the core grains to form a film, so if the core grains are uneven in shape, particle size distribution, etc. The shape and size of the product will be uneven.

Therefore, conventionally, it has been common to press-form the tablet into a predetermined shape and size using a tablet press or the like, and then apply coating.

This invention eliminates the above-mentioned conventional drawbacks and produces nearly spherical particles (
In addition to granulating high-yield granules (or granules), it is possible to reduce the amount of gas supplied to perform granulation and drying as much as possible, preventing clogging of bag filters and performing granulation work. The purpose of this is to increase the efficiency of the system and significantly reduce energy consumption.

The present invention will be described in detail below with reference to the illustrated embodiments.

In the figure, reference numeral 1 denotes a granulation chamber formed in the shape of an upright cylinder with a bottom, and a multilayer plate 2 is rotatably arranged at an appropriate height on the inner bottom of the chamber, and is attached to the upper end of a drive shaft 3 and driven to rotate. I will do my best.

The multilayer board 2 has a large number of annular plates 4 with different diameters arranged in a concentric layered manner in which the diameter increases toward the bottom, and has an appropriate number of gap retaining pieces 5 arranged equidistantly around the circumference between each annular plate 4. These are integrated with an appropriate vertical gap. The heat, air, or gas supplied below the multilayer plate 2 becomes a centrifugal airflow and blows out into the granulation chamber I from the upper and lower gaps between the respective annular plates 4 as the multilayer plate 20 rotates. The drive shaft 3 is
It is supported upright by a bearing 6 fixed to the bottom wall of the granulation chamber 1, and is rotationally driven by a motor 7. The motor 7 may have a variable rotation speed, or may be equipped with a reduction gear f (not shown).
The rotational speed of the drive shaft 3 is made variable by I'7' and the transmission device. 8 is a stopper lid fixed to the upper end of the drive shaft 3.

An opening 11 that is opened and closed by an on-off valve 10 operated by a cylinder 9 is provided at a position lower than the multilayer plate 2 on the bottom side wall of the granulation chamber 1. Hot air or other suitable gas sealant should be supplied.

The gas supply means 12 supplies the atmosphere or a suitable gas to a filter 13 , a gas flow meter 14 , a control valve 15 , and a gas flow meter 14 .
It is equipped with a flow rate indicating regulator 16, a blower 17, and a heater 18 which detects the flow rate of the flow rate and controls the operation of the control valve 15, and is connected to the gas supply port 20 of the on-off valve 10 via the gas supply pipe 9, A required amount of gas is supplied into the granulation chamber l from below the multilayer plate 2. The heater 18 is a heat exchanger using steam or other heating fluid as a heat source, and a temperature detector 21 detects the temperature of the hot air and gas body passing through the gas supply pipe 19, and a temperature indication regulator 22 The heated fluid flow rate control valve 23
A heating fluid supply pipe 024 is used to adjust the opening and opening of the heating fluid. Needless to say, the gas body may be heated by using an electric heater or the like in addition to using a heating fluid. In addition, in case heating of the gas body is not required, a bypass pipe 25 for the heater 18 is provided, and the skeleton 25 is to be opened and closed by an on-off valve 26.

On one side of the upper housing 27 provided at the upper part of the granulation chamber 1,
A powder supply port 29 that is opened and closed by a powder supply valve 28 is provided to supply powder from a powder supply device 30 onto the multilayer board 2. The powder supply device 30 serves as a powder pneumatic transportation device.
Air from the blower 17 is supplied through the valve 31 and
The powder introduced into the powder supply port 29 is supplied to the powder supply port 29 via the powder transport pipe 33.

The upper housing 27 is further equipped with a spray nozzle 34 for spraying a binder solution onto the powder placed on the multilayer plate 2 (Z). In the case of the embodiment, the spray nozzle 34 is a two-fluid injection nozzle, and is supplied with a required amount of binder solution and gas from a binder solution supply control device 35. The binder solution supply control device 35 includes a solution tank 36 equipped with a solution stirring device, and a solution in the tank 36 that is connected to the nozzle 34.
A pump 37 for feeding liquid under pressure, and a flow meter 3 for detecting the amount of liquid fed.
8. A control valve 39 that controls the amount of liquid sent, a flow rate indicator regulator 40 that detects the flow rate of the flow meter 38 and controls the control valve 39, a liquid sending pipe 41, a liquid sending pipe pressure that is detected and the spray nozzle 34 is clogged. Pressure switch 4 detects whether spraying is not performed properly.
A liquid delivery system consisting of 2 and a gas body such as compressed air are supplied,
It consists of an air supply system that sets a predetermined pressure with a pressure gauge 43, a pressure reducing valve 44, etc., and supplies a gas body to the spray nozzle 34 through an air supply pipe 46 via an on-off valve 45. 47 is a flow rate detector that detects the gas flow rate of the air supply pipe 46. 48 is a gas flow detection switch that controls the on-off valve 45 when the flow rate is high.

Outside the multilayer plate 2 on one side wall of the granulation chamber 1 1. A granule discharge port 49 whose lower edge of the opening is aligned with approximately the same height as the edge 'd is opened, and a discharge means 5o is provided for discharging the granules granulated on the multilayer plate 2 from the granulation chamber 1. The discharge means 50 has an on-off valve 51 that opens and closes the discharge port 49, and a discharge cylinder 52 that operates the valve 51, and when granulation is completed, the on-off valve 51 is closed.
to open the discharge port 49. Also, on the side wall of the granulation chamber l,
A sieve 54 formed in a cylindrical shape and continuous with the discharge port 49 is installed in a discharge housing 53 that is fixedly arranged to surround the discharge port 49, and the granules discharged from the discharge port 49 are filtered into the core portion 54. The granules are sieved through a sieve, and only particles having a predetermined roughness or less are discharged from the discharge port 58 of the housing 53. , sieve 5
The coarse particles remaining in the sieve 54 are pressed against the sieve by a crusher 55 rotating within the sieve 54, as shown in FIG. You can also do this. The crusher 55 is rotated by a motor 56 via a belt transmission mechanism 57 and the like. It is preferable that the sieves 54 have exchangeable sieves with different sieve mesh coarseness, and if there is no particular need for sieving, the sieve, crushing blades, etc. can be omitted. Furthermore, the shape of the sieve need not be limited to a cylindrical shape, and other suitable configurations may be used.

A gas discharge device 59 is provided above the upper housing 27 for discharging the gas to the outside of the granulation chamber 1 while collecting dust generated during the granulation process. On the upper housing 27,
A dust collection chamber 60'lf: provided, a plurality of bag filters 61 are provided in this chamber 60, and a plurality of bag filters 61 are provided through an exhaust pipe 62.
The gas body from which dust has been separated by 1 is discharged to the outside of the apparatus through an exhaust fan 63 and a muffler 64.

If the bag filter 61 continues to perform granulation work for a long time, it may become clogged with dust floating in the exhaust gas. It is still necessary to perform exhaust gas commensurate with the amount of gas to be supplied from the supply means 12 with gas.

In order to control the amount of exhaust gas, a pressure transmitter 65 is provided at the top of the dust collection chamber 60, and a control valve 67 provided in the exhaust pipe 62 is controlled via a pressure indicating regulator 66. Try to keep the pressure constant.

As a means to prevent clogging of the bag filter 61, a compressed air pipe 70 with an air outlet facing the exhaust opening 69 of the bag filter 61 is provided in the bag filter exchange chamber 68, and a pressurized air reservoir 71 and a solenoid valve 72 are provided. , pressurized air is alternately blown against the plurality of bag filters 61 through the diaphragm valve 73 etc. to cause a backflow air flow in the bag filters 61, as indicated by arrows in the lower bag filter 61 in FIG. In this way, backflow air is caused to flow back into the dust collection chamber 60, and the dust accumulated in the eyes is blown away to prevent the filter 61 from clogging.

By sending compressed air that flows back into the plurality of bag filters 61 alternately at regular intervals, the bag filters 61 can be cleaned without interrupting the granulation work. Reference numeral 74 denotes a partition wall that supports the bag filter 61 in a replaceable manner, 75 denotes a desiccation dissipation plate provided to prevent dangers such as dust explosions caused by static electricity generation during granulation work, and 76 denotes an explosion outlet. This is to ensure the safety of the equipment.

When changing the granulation type or starting a new granulation process, the inner wall of the granulation chamber 1 and the multilayer plate 2 in the previous granulation process
It may be necessary to wash away the dust that accumulates on the ground.

In preparation for such a case, the cleaning nozzle 77 is removably attached to the upper housing 27 or inside the granulation chamber 1.

The cleaning nozzle 77 is preferably configured to be rotated by an operating section 78 as shown by the arrow, and whose head can be rotated through 360 degrees. The cleaning device 79 includes a cleaning pump 81 that supplies high-pressure cleaning liquid to the cleaning nozzle 77 through a cleaning pipe 80, and a chemical liquid injection container 82 that injects the chemical liquid in the chamber into the cleaning liquid to enhance the effect.

Further, in the gas supply agent housing 83 of the gas supply opening 9,
A drain valve 84 is provided, and the drain liquid that has washed the granulation chamber 1 and the multilayer plate 2 is discharged through the opening 9 and the drain valve 84.

85 is a multilayer plate 2 along the bottom wall of the granulation chamber 1 by the drive shaft 3.
A dispersion blade provided to rotate together with the multilayer plate 2
The powder that has fallen further is carried by the airflow generated by the rotation of the plate 85, and is sent onto the multilayer plate 2 again through the upper and lower gaps formed by the gap holding pieces 5 of the multilayer plate 2. In addition, during the cleaning, it also serves to stir the cleaning liquid at the bottom of the granulation chamber and forcibly discharge it from the opening 9. 86 is a cylinder for raising and lowering the granulation chamber 1, and for example, the multilayer plate 2 or the bag filter 61.
The granulation chamber 1 is lowered when replacing the granulation chamber 1, etc., making the work easier.

As shown in FIGS. 2 and 4, the multilayer board 2 is made up of annular plates 4 of different diameters arranged concentrically in layers with a gap holding piece 5 in between, and an annular plate 4 with a large culm diameter extending downward. However, as shown in Figures 5 and 6, this is the case between M! The holding pieces 5 are arranged in a spiral shape with respect to the rotational direction of the multilayer plate 2.
In this case, the gas is blown out from the multilayer plate 2 in the direction of rotation A as shown by the arrow B.

Further, as shown in FIGS. 7 and 8, several flow assisting blades 2a are arranged on the upper surface of the multilayer plate 2 in a spiral shape with respect to the rotation direction A thereof. Alternatively, as shown in FIGS. 9 and 10, flow assisting blades 2b having an appropriate angle with respect to the rotational direction A are provided upright on the upper surface of each annular plate 4.

This invention has the above structure, and the granulation method thereof will be explained below.

First, open the gas supply on-off valve 1o, and turn on the blowers 17 and 63.
Start. As a result, the atmosphere or gas body purified by the filter 13 is heated to the required humidity by the heater 18, and is supplied to the granulation chamber 1 from below the multilayer plate 2, and from the upper and lower intervals of the many annular plates 4 in the centrifugal direction. Speech out.

The multilayer board 2 has, for example, 500 to 1000 R, P, M.

When the multilayer plate 2 is rotated at an appropriate speed, the hot air or gas blown out from the multilayer plate 2 flows in the centrifugal direction and the rotational direction of the multilayer plate 2, forming a swirling airflow along the inner wall of the granulation chamber 1. Flow. When the powder supply valve 28 is opened and a required amount of powder is introduced into the granulation chamber 1, the powder rides on the swirling airflow and flows into the swirling airflow as shown by arrows in FIGS. 1 and 2. At the same time, a cotton-like swirling laminar flow occurs. In other words, at the same time as it flows along the rotation of the multilayer plate 2, it flows in a centrifugal direction on the upper surface of the multilayer plate 2, hits the wall of the granulation chamber 1, and rises. It will fall towards the center. Such a rope-shaped swirling laminar flow allows uniform mixing of the powder particles introduced. Also, when the flow assisting blades 2a or 2b are provided, the swirling laminar flow on the multilayer plate 2 Furthermore, it exerts a forced stirring action to promote uniform mixing.

Therefore, by supplying a predetermined amount of binder solution and compressed air from the binder solution supply control device 35 to the binder solution spray nozzle 34, the binder solution becomes a fine mist and swirls as described above. The powder is fed into a fluidized bed, and fine particles of the binder solution adhere to the powder particles to form a granulation core. Powder is further agglomerated and bonded to this core, and these agglomerated and bonded particles are further caught up in the swirling laminar flow, rub against each other, and grow to a desired particle size while rotating and revolving, and large swirl particles are crushed. , spherical particles or spherical granules with approximately constant particle size are formed.

The particle size of the granules or granules is determined by the particle size of the binder solution, the amount of supply of the binder solution, the supply rate, the type of binder,
It changes due to changes in various factors such as the physical properties of the input powder, the rotation speed of the multilayer plate, and the temperature of the hot air.

At least one of these factors should be appropriately controlled in order to obtain particles with a desired particle size with a high yield. Furthermore, the residence time of the particles on the multilayer plate 2 is also related to the growth of the particle size, and also affects the bulk density of each particle.

A very small portion of the powder placed on the multilayer plate 2 falls downward from the vertical spacing between the annular plates 4 that make up the multilayer plate 2, but this is caused by the dispersion blades rotating together with the multilayer plate 2 below. 8
5, the particles are suspended in the gas flow in the granulation chamber 1, and again into the swirling laminar flow on the multilayer plate 2.

It returns to the growing particles and is granulated.

A very small portion of the powder introduced into the granulation chamber 1 is absorbed by the gas that rises inside the granulation chamber 1. and is collected by the bag filter 61. Therefore, if compressed air flowing backwards is blown into the bag filter 61 as described above, the powder that has arrived at the filter 61 will fall into the granulation chamber 1 again and be caught up in the swirling laminar flow of particles. It attaches to growing particles and becomes granules. - Therefore, a plurality of bag filters 61
f: If the setting is such that the adhering powder is brushed off, the powder will be collected by the bag filter 61 and remain while the granules are being granulated to the required diameter in the granulation chamber l. The amount of powder can be reduced as much as possible, and the yield of granules relative to the amount of input powder can be increased.

The granulation effect in the above-mentioned swirling laminar flow is such that the fine powder adheres to the surface of the particles moistened by the Futuna-style drip droplets and is uniformly spherical in the granulation chamber, so the variation in particle size distribution is extremely small. , high yield granulation can be achieved.

If you want to obtain particles with a small particle size (for example, 15%φ or less), you can use a two-fluid nozzle to reduce the droplet diameter and slow down the liquid supply speed to speed up drying with hot air. ,
When the granules with the droplet as the core are granulated with the diameter at that point, and the diameter of the droplet sprayed from the two-fluid nozzle is desired to be further reduced, the temperature of the gas body ejected together with the binder solution is increased. This purpose is achieved by allowing the granules to granulate even smaller diameters.

On the other hand, when attempting to granulate granules with a relatively large diameter (for example, 1.5%φ or more), in addition to the above-mentioned operation, increasing the rate of addition of the binder solution will allow the granules to be granulated. Several particles gather together, and some powder is added to them to grow into large particles. In addition, by increasing the size of the sprayed droplets of the binder solution, we create a granular core with a large degree of wetting, increasing the chances of powder adhesion and agglomeration, and drying by lowering the temperature of the hot air. By slowing down the flow and lengthening the residence time of the swirling laminar flow on the multilayer plate 2, particles of any desired diameter can be grown.

When it is desired to obtain granules with a large bulk density (low porosity), the residence time of the group llll 11 laminar flow on the multilayer plate 2 is lengthened to perform the reciprocal rubbing and polishing action of the granules as they rotate and revolve. By increasing the time or by increasing the rotational speed of the multilayer plate 2 to increase the flow speed of the swirling laminar flow and increasing the centrifugal force acting on the grains, the grains are rubbed together during their rotation and revolution. By increasing the acting force,
Particles that are sufficiently hard and have a large bulk density can be obtained, and variations in particle size distribution can be further reduced.

When it is desired to obtain relatively porous particles with a low bulk density, contrary to the above, the residence time on the multilayer plate may be shortened or the rotation speed of the multilayer plate may be delayed.

The major feature of this invention is that a large number of annular plates 4 with different diameters are provided with vertical spacing by an appropriate number of gap retaining pieces 5, and a shaped plate 4 with a large Rj diameter extending downward is arranged and 1 is integrated. The multilayer plate 2 is rotated at high speed in the granulation chamber 1, and the granulation action is performed on the multilayer machine 2. By doing so, the amount of hot air or gas supplied below the multilayer board 2 can be significantly reduced. In the conventional fluidized bed granulation method, if there is insufficient pulse pressure, the granules may fall through the holes in the perforated plate, causing the granules to fall through the holes in the perforated plate and prevent proper granulation. The drawback was that it was no longer carried out.

In line with this, in the case of the present invention, the high-speed rotation of the multilayer plate generates centrifugal airflow that blows out horizontally and radially from the upper and lower spaces of the annular plate, and this centrifugal airflow forms a swirling laminar flow. The phenomenon of conventional gas venting is completely eliminated.

Even if the wind pressure is small, powder or granules often fall downward from the vertical spacing of the annular plate. Furthermore, in the case of this invention, the formation factor of the swirling laminar flow is due to the flow state of the centrifugal airflow, which increases in proportion to the rotational speed of the multilayer plate, and the flow rate and pressure of the supplied hot air, gas, etc. It's mostly unrelated. Rather, this scenery and wind pressure are sufficient to dry the particles, and reducing the scenery and wind pressure has the effect of reducing the number of powder particles floating to the dust collection chamber.

In the conventional granulation method using a perforated plate, it was not possible to reduce the air volume and wind pressure to a certain value or less, but in this invention, in order to obtain granules under the same conditions, the air volume and wind pressure could be reduced to % or less. The amount of dust consumed can be reduced accordingly, and the amount of suspended dust can be reduced to prevent clogging of bag filters.

When granulation and drying of one culm are completed, the on-off valve 51 is operated to open the discharge port 49, and the Iil? i54
1. As a result, particles smaller than Nft are discharged from the discharge port 58 through the sieve mesh. On the other hand, if there are large-diameter particles remaining on the sieve, the crushing blades 55 are rotated to crush the large-diameter particles, allowing them to pass through the sieve and leaving the discharge port 5.
Released from 8.

In addition, when forming (coating) a film of a coating agent on a granulated product, the desired coating is applied from above the particles which are formed to a predetermined particle size in the granulation chamber, dried, and swirled. Supply P3 agent solution. In this way,
The coating solution uniformly adheres to the surfaces of the particles made into spherical or nearly spherical shapes in the granulation step, and forms a coating of uniform thickness by the rubbing action of the granules as described above. During this time, by appropriately controlling the temperature and air volume of the gas supplied onto the multilayer board from the upper and lower gaps of the multilayer board, the film adhering to the granules is efficiently dried, and the desired film can be formed in a short time. Complete. From this step K, the steps of forming granules of a desired diameter and forming a coating are performed in conjunction with each other between the time the powder is introduced into the granulation chamber and the time it is discharged. For supplying the coating solution, the two-fluid spray nozzle may also be used, or a separate nozzle for supplying the coating solution may be provided.

Furthermore, the required amount of coating solution may be supplied all at once from above the granulation chamber.

When it becomes necessary to change the granulation lot or powder type, the granulation chamber 1, multilayer plate 2, etc. are cleaned. The cleaning nozzle 77 is inserted into the upper housing 27, and the cleaning liquid, quasi-liquid, etc. are injected from the nozzle 77, and the multilayer plate 2 and the dispersion blade 85 are rotated at an appropriate speed. By rotating the machine, cleaning can be performed automatically without the need for manpower. Washing liquid is on-off valve IO
Then, the drain valve 84 is opened to discharge the water.

As described above, this invention can reduce the amount and pressure of hot air, gas, etc. to be supplied to a few fractions of that of the conventional method, so the energy consumption y4'lNj can be greatly reduced, and the bag filter can be used. It is possible to prevent clogging, reduce the number of replacements, and effectively granulate granules of arbitrary particle size and bulk density with little variation at a high yield.

1. A sieve and crushing blades are installed in the rI body discharge section, and during the progress of the grain process, backflow compressed air is alternately supplied to the bag filter, and the powder adhering to the filter is removed from the multilayer plate. By forming a swirling laminar flow and dropping the powder into the flowing powder, it is possible to further increase the yield in granulation, and moreover, it is possible to further increase the yield in granulation, from forming powder of any diameter to forming a desired coating. Relatedly, it can be carried out in one container, making the work significantly easier and more efficient. Incidentally, it goes without saying that the apparatus of the present invention can only be used to coat and scale granules that have already been formed into a certain shape.

[Brief explanation of the drawing]

Fig. 1 is a diagram showing one embodiment of the device of the present invention, Fig. 2 is an enlarged longitudinal cross-sectional view of the granulation chamber, and Fig. 3 is a view taken from lll-1ll of Fig. 2.
1 on the line is a cross-sectional side view, 4th line 1 is a plan view of the multilayer board,
FIG. 5 is a plan view showing another example of the multilayer board, FIG. 6 is a vertical t41i plane view of the main part of FIG. 5, FIG. 7 is a plan view of another example of the multilayer board, and FIG. Fig. 9 is a plan view of still another embodiment of the multilayer plate, and Fig. 10 is an introduction to the main parts.
... Multilayer plate, 3... Drive shaft, 4... Annular plate, 5...
・Gap holding piece, lO...Opening/closing valve, 12...Gas supply means, 17...Kite sending, 18...Heater, 19.
・・Gas body supply pipe, 27・・Upper housing, 28・
... Powder supply valve, 29 ... Powder supply port, 30 ... Powder supply device, 34 ... General jet nozzle, 35 ... Binder solution supply control device, 37 ... Liquid feeding Pump, 49...
Granule discharge port, 50...Discharge means, 51...Opening/closing valve,
53... Discharge section/Using, 54... Sieve, 55...
...Crushing blade, 59...Gas body discharge device, 6o...Dust collection chamber, 61...Bag filter, 63...Exhaust fan, 7o...Compressed air pipe, 71...Pressure air reservoir,
77 River cleaning nozzle, 79...Cleaning device, 81...Cleaning pump, 83...Gas supply unit housing, 84...
・Drain valve, 85...Dispersion blade applicant Fuji Paudal Co., Ltd. agent Goho - Sanji 1 Figure 7 Figure 9

Claims (1)

[Scope of Claims] (1) A multilayer plate, which is integrated with a plurality of annular plates having different diameters and arranged in a rotational arrangement, with vertical gaps provided therebetween, is rotated at the inner bottom of an upright cylindrical granulation chamber. By supplying a gas from below, a fluid airflow is formed on the multilayer plate that swirls in the rotation direction and the centrifugal direction, and the powder introduced onto the multilayer plate is formed with a swirling laminar flow by the airflow. (2) A granulation method characterized by spraying a binder solution to cause powder particles to adhere to and agglomerate on the sprayed droplets, and causing the agglomerated particles to rotate and revolve within the swirling laminar flow. (3) The granulation method according to claim (1), wherein the size of the aggregated particles is controlled by controlling the size of the sprayed droplets, the amount of the sprayed liquid, and the spraying speed. (4) The granulation method according to the desired range (1) or (2), in which the size of the sprayed droplets of the binder solution is controlled by the temperature of the gaseous body ejected together with the binder solution. Claim (1): Controlling the residence time of aggregated particles in a laminar flow to control the size of the particles.
From (3)! The granulation method (5) described in any one of
Claim 1: After stopping the spraying of the binder solution, the bulk density of the aggregated particles is controlled by controlling at least one of the residence time of the aggregated particles in the swirling laminar flow and the rotation speed of the multilayer plate.
) to (3), (6) supplying a coating agent to the particles rotating and revolving in the swirling laminar flow, and forming a ruptured membrane of the coating agent on the particles. Feature a'1: Granulation method according to any one of claims (1) to (5) (7) 'Granulation in an OjJ granulation chamber/granules. Claims (1) to (5) characterized in that the particles are sieved and excessive particles remaining on the sieve are crushed and passed through the sieve.
Granulation method according to any one of (8) in a trench: an upright cylindrical granulation chamber, a number of annular plates with different IU diameters placed 1a at the inner bottom of the 41-grain chamber; multi-layer plates arranged concentrically and integrated with vertical gaps provided between each annular plate so as to increase the number of annular plates; means for rotating the multi-layer plates; supplying a gas into the granulation chamber from below the multi-layer plates; means, means for supplying the powder onto the multilayer plate, means for spraying a binder solution onto the powder on the multilayer plate, discharge means for discharging the granules on the multilayer plate to the outside of the granulation chamber, and gas in the granulation chamber. (9) A granulating device (10) according to claim (8), wherein the rotation speed of the multilayer plate is variable. ) The granulation apparatus according to claim (8), wherein the gas supply means is provided with a means for controlling the amount and temperature of the gas.]) The binder solution spraying means includes a two-fluid spray nozzle. Claim 8, wherein the nozzle simultaneously sprays two fluids, a binder solution and a gaseous body, and the spraying means is capable of controlling the temperature and amount of the gaseous body. Granulation device 02 The means for discharging the granules includes a sieve device that is connected to a discharge port that is provided on the side wall of the granulation chamber and is opened and closed by an opening/closing device, and the sieve portion is a device that allows the granules to be discharged from the discharge port. A cylindrical sieve into which the body is placed, and the fi! A granulating device according to claim (8), further comprising a crushing means that rotates along the inner wall of the sieve to crush the granules remaining on the sieve and pass through the sieve openings! O■ The means for discharging the gas inside the granulation chamber while collecting the dust floating therein includes a plurality of bag filters for collecting the dust, and the means for discharging the gas inside the granulation chamber while collecting the dust floating therein includes a plurality of bag filters for collecting the dust, and discharges the gas body alternately to the plurality of bag filters. The granulating device (141) according to claim 8, comprising means for blowing pressurized air in the opposite direction to the passing exhaust gas airflow to prevent clogging of the bag filter (141) Granulation apparatus 00 according to any one of claims 8 to 0, comprising a cleaning means for cleaning the inside of the granulation chamber and a discharge section for discharging the cleaning liquid. Near the granulating device θ according to claim (I4), which is provided in common with the means for supplying a gas into the granulating chamber from below. A granulating device according to claim 141, which includes a rotating nozzle provided therein and is capable of using a cleaning chemical solution.