JPS6327050B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to a wet granulation method and apparatus for producing fine granules with uniform particle size by mixing one or more types of granules and then adding water or a binder solution. Conventional wet granulation methods of this type include the spray granulation method, in which a material solution is spray-dried and granulated, and the fluidized bed method, in which the granules are humidified and grown while flowing on a perforated plate, and then dried to form granules. Granulation method, crushing and granulation method in which granules that have been mixed with water are crushed using a crushing granulator, dried and then sieved, and the powder is placed in a container with rotating blades that rotates at high speed and mixed. However, methods such as agitation granulation, in which granules are made by adding liquid, are known, but in either case, the particle size distribution of the granules varies widely, and the yield of the desired particle size is only around 50% or less. However, it is extremely inefficient and has the disadvantage that it is extremely difficult to make the particle size uniform. This invention uses the wet granulation method described above to produce granules with a diameter of approximately 0.7 mm (24 meshes) to 0.1 mm (145 meshes) with a high yield, and which can produce powders of two or more types. The object of the present invention is to provide a granulation method and apparatus that can granulate the mixture after mixing with extremely high efficiency. In the granulation method of this invention, water or a binder solution is supplied from above the powder flow rotating around a horizontal axis to create a uniformly dispersed phase of powder and liquid, and the mixed powder that grows in this dispersed phase is The powder is crushed and separated by the action of an impacting body rotating at high speed at the center or eccentric position inside the rotating powder flow, or it is blown away by the action of the impacting body and combined with other powder to reduce the required particle size. While powder is mixed by the impactor, a plurality of pins integrated with the impactor that extend slightly outward from the impactor restrict the overcrowding of the powder into a predetermined space including the rotation range of the impactor. The granulation efficiency is further improved by promoting the separation and binding action of the powder, and by having the pins share a part of the separation and binding action of the impact body. . The granulating device of the present invention is a device that is directly used for carrying out the above granulating method, and has a cylindrical container whose axis is horizontal and whose one end is closed with an end plate and the other end is closed with a cover plate. A material input port and a material discharge port are provided in the
Inside the vessel, a cage-shaped stirring rotor is placed concentrically with the vessel, and an impact rotor is placed further inside the stirring rotor with its axis horizontal. In addition to protruding a plurality of stirring elements close to the peripheral surface, a plurality of impacting bodies and a plurality of pins extending outward from the impacting bodies are provided on the outer periphery of the impacting rotor, and the stirring rotor and impacting rotor are respectively arranged as required. A driving means for rotating at a rotational speed is provided, and the powder material inputted into the cylindrical container from the material input port is rotated along the inner wall of the container by the stirring rotor, while liquid is added by the impact body of the impact rotor. It separates and combines the mixed powder, and the pin of the impact rotor prevents the powder from entering the rotating range of the impactor in a dense manner, promoting the separation and combination of the impactor. It is characterized in that a part of the separation and combination functions are shared. To explain the embodiment, in FIGS. 1 and 2, reference numeral 1 denotes a cylindrical vessel whose axis is arranged horizontally and whose one end is closed by an end plate 2 and the other end is closed by a lid plate 3. . A material input port 4 is provided at the top of the vessel 1,
A product discharge port 6 that is opened and closed by a lid 5 is provided at the bottom. It is desirable that the lid plate 3 be able to be attached to and removed from the container body 1 for washing, cleaning, etc. inside the container body 1. As shown in the second figure, the material input port 4 may be provided with a lid 7 for closing the material input port 4 during the granulation operation. 8 is a hopper for feeding materials, and 9 is a connecting rod for opening and closing the lid 5 of the discharge port 6 by an opening/closing mechanism (not shown). A rotor 10 having a stirring element 14 inside the vessel 1
and an impact rotor 11 are rotatably provided on the central shaft portion. As shown in detail in FIG. 3, the stirring rotor 10 is formed into a cage shape supported by the end face of a disc 13 provided at the shaft end of the first drive shaft 12, and has a cylindrical shape of the vessel body 1 on its outer periphery. A plurality of arm-shaped stirring elements 14 are provided protruding from the inner peripheral surface. In the case of FIG. 3, when the stirring rotor 10 rotates in the direction of arrow A, the material in the container 1 is stirred so as to move from both axial ends of the container 1 toward the center in the directions of arrows a and a'. Stirring rotor 1 in the direction of element 14
Gives an appropriate inclination to the zero axis. Furthermore, the stirring elements 14 arranged at both ends of the stirring rotor 10 include
A scraper 15 is formed to scrape off powder adhering to the end plate 2 and lid plate 3 by rotation of the stirring rotor 10. The first drive shaft 12 is a chain drive mechanism rotatably supported by a support frame on the end plate 2 via a bearing 16 (only the chain wheel 17 is shown).
For example, if the diameter of the cylindrical container is 205 mmφ,
Rotate at a speed of 10−50 R.PM. Impact bodies 18, which are elongated plate-shaped bodies extending from one end to the other end, are protrudingly provided on the impact rotor 11 at equal radial locations. In addition, apart from the impact body 18,
A plurality of pins 24 extending slightly outward from the impact bodies 18 are provided between each of the impact bodies 18 , 18 . For example, if the diameter of the cylindrical container 1 is 205 mmφ, the impact rotor 1
The diameter of the impact member 1 is 58 mm, and the height of the impact member 18 is 9 mm. It is driven at high speed as shown by arrow B in FIG. 21 is a motor for driving the impact rotor, and the rotation speed of the motor is changed using a converter (frequency converter). A device with a built-in transmission device (not shown) or a variable speed motor may also be used. When the impact body 18 of the impact rotor 11 is configured as shown in the fourth figure, in relation to the rotation of the stirring rotor 10,
By rotating the impact rotor 11 in the direction of arrow B, the material in the container body 1 is axially moved in one direction of arrow b or b', or from the center toward both sides of the container body 1 as shown by arrow b-b'. can be moved in the direction. Further, as shown in FIG. 5a, the impact body 18a may be a plate-shaped body having a length obtained by dividing the length of the impact rotor 11 into a plurality of parts. The material can be moved in one direction of arrows b or b' or in two directions of b-b'. FIG. 5b shows that the impact body 18b is connected to the impact rotor 11.
The case is shown when tilted with respect to the axis of . Depending on the inclination, the material can be moved in the direction b, or the opposite inclination can be used to move the material in the direction opposite to b, and if it is tilted symmetrically from the center, it can be moved from the center to both sides. . Fig. 5c shows a structure in which the length of the impact body 18c is shortened, and in this case, it is arranged symmetrically in a spiral shape,
The rotation of the impact rotor 11 in the direction of arrow B moves the material inside the container body 1 in two directions b-b'. The pins 24 of the impact rotor 11 are arranged as shown in FIGS.
As shown in Figures a and c, the arrangement may be such that it radiates crosswise to the impact rotor 11, or it may be arranged so that it radiates only in one diameter direction of the impact rotor 11, as shown in Figure 5b. can. A knife edge 25 is formed in a part of the circumference of the pin 24, as shown in FIG. The direction of this knife edge 25 is the direction of movement b of the material mentioned above or
b' is determined according to the protruding location of the pin 24. In Figures 1 and 2, 22 is a spray for adding water or other liquid to powder, and is a spray that is sprayed when adding water or the like, or a spray that is used to add a large amount of liquid rapidly. Any item can be used. 23 is a frame that supports the container body 1. 7 and 8 are diagrams showing a second embodiment of the present invention, in which the rotational axis of the impact rotor 11 is eccentrically lower than the axes of the vessel body 1 and the stirring rotor 10, and is horizontal. It is set in. Figure 1,
The same parts as in FIG. 2 are given the same reference numerals. Providing the impact rotor 11 eccentrically in this manner is effective when the forced flow by the impact rotor 11 is strengthened, or when the amount of processing at one time is small. Further, the effect of crushing oversized particles by the impact body 18 of the impact rotor 11 is also increased. FIG. 9 is a diagram showing a third embodiment of the present invention, and shows a material input port 4, a discharge port 6, and an opening/closing lid 5.
is provided on the lid body 3, and the drive shafts 12 and 20 of the stirring rotor 10 and the impact rotor 11 are used as double shafts so that they can rotate concentrically at different rotational speeds, and this drive mechanism is connected to the end plate. The case where it is provided on the second side is shown. Also, the stirring element 14 of the stirring rotor 10
A is a ribbon-shaped plate material twisted spirally to bring it close to the cylindrical inner circumferential surface of the container body 1, so that the material inside the container body 1 moves in one direction as shown by the arrow a. The impact rotor 11 also has its impact body 18c projecting in a spiral arrangement so that the material moves in one direction as shown by arrow b. 10 and 11 are modifications of the embodiment shown in FIG. 9. In this case, the impact body 18c is arranged symmetrically in a spiral shape, and by rotation of the impact rotor 11 in the direction of arrow B, This shows an arrangement in which the material inside the vessel 1 is moved in two directions b-b'. The stirring element 14a is also twisted symmetrically in a spiral shape so that the material moves in two directions as shown by arrows a-a'. In addition, although the above embodiment has shown the case where the stirring rotor 10 and the impact rotor 11 are rotated in opposite directions to increase the difference in rotation speed, they may also be rotated in the same direction. The various impact bodies 11, for example 18, 18a, 18b, 18c shown in FIGS. 1 and 5, may have a hammerhead shape in addition to the configuration described above. Next, an embodiment of the granulation method of the present invention, which is carried out using the apparatus configured as described above, will be described. While driving the stirring rotor 10 and the impact rotor 11 at low and high speeds, respectively, several types of powder or one type of powder are introduced into the container 1, and if necessary, an appropriate amount of binder is introduced, and the process continues for several tens of seconds. By operating for ~ several minutes, the powder and binder or several types of powder are transferred to the impact body of the impact rotor 11 and the stirring rotor 10.
While being moved in the axial direction of the vessel body 1 by the stirring element, the mixture is efficiently mixed and stirred and uniformly dispersed. Then, the required amount of water or liquid is supplied either dropwise or in a spray state using the spray 22, and each rotor continues to rotate in this state, thereby efficiently producing fine particles within the particle size range described above. be able to. When water or the like is supplied to the well-mixed powder in the vessel 1 as described above, the powder first aggregates and grows using the liquid as a core, forming a moist moxa-like powder/liquid mixture. As shown in FIGS. 2, 8, and 11, this mixture is lifted from below to above by the stirring element as the stirring rotor 10 rotates in the direction of arrow A, and then falls toward the impact rotor 11. That is, the mixture collides with the impacting body rotating at high speed, is crushed, and moves centrifugally, is lifted up by the stirring element again, falls, and is caused to collide with the impacting body towards the impacting rotor 11. During this time, the material inside the vessel 1 moves in the axial direction within the vessel 1 at a speed commensurate with the rotational speed of each rotor 10, 11 due to the rotation of each rotor 10, 11, due to the arrangement of the stirring element and impact body. and subjected to mixing and stirring action. In this process, the fine powder grows to a certain size as a mixture moistened with the liquid, and the mixture that has grown excessively falls from above the impact rotor 11 under its own gravity and collides with the impact body, causing small particles is blown away by the wind pressure of the impactor rotating at high speed and does not directly collide with the impactor. As described above, the rotation of the stirring rotor 10 stirs the powder and wet mixture that collects at the bottom of the container 1, causes them to grow depending on the degree of wetness, and moves them above the container 1. and drop it toward the impact rotor 11. On the other hand, the rotation of the impact rotor 11 has the effect of crushing the mixture falling from above inside the container body 1 by the impact body to form granules of a desired diameter. Also,
Small granules with a required diameter or less are blown away by the wind pressure generated by the rotation of the impactor, so they are prevented from being crushed, and the particles are thereby classified. In the above-mentioned granulation process, the rotation of the pin 24 protruding from the impact rotor 11 restricts to some extent the powder or wet mixture from entering the predetermined space including the rotation area of the impact body. The above-mentioned disintegration and granulation action by the body is greatly promoted. Further, since the pin 24 itself has the same crushing and granule forming function as the impactor, the pin 24 shares a part of the function, and granulation is performed more effectively. By repeating such mixing, stirring, granulation, crushing, and classification actions, the powder inside the container changes depending on its quality, physical properties, binder physical properties, amount of liquid added, etc., but the rotational speed of the impact rotor It is granulated into granules of an appropriate size. Next, in order to demonstrate the effect of a plurality of pins attached to the impact rotor, we will present an example using the device of the present invention shown in FIGS. 1 to 4, and a configuration in which the pins are removed from the same device. A comparative example using the device is also listed below.

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Claims (1)

[Claims] 1. A binder liquid is supplied from above the powder flow rotating around a horizontal axis to create a uniformly dispersed phase of powder and liquid, and the mixed powder that grows in this dispersed phase is The particles are separated and combined by an impact body rotating at high speed inside the flow, while a plurality of pins integrated with the impact body extending slightly outside the impact body prevent powder from entering a predetermined space including the rotation area of the impact body. A granulation method characterized in that the separation and bonding of mixed powders by an impactor are promoted by restricting. 2. A cylindrical vessel whose axis is horizontal and whose one end is closed with an end plate and the other end with a lid plate is provided with a material input port and a material discharge port, and a cage-shaped container is arranged concentrically with the vessel body. A stirring rotor and an impact rotor whose axis is horizontally arranged further inside the stirring rotor are provided.
A plurality of stirring elements protruding from the outer periphery of the stirring rotor in proximity to the cylindrical inner circumferential surface of the vessel body, and a plurality of impacting bodies and a plurality of pins extending outward from the impacting bodies are provided protruding from the outer periphery of the impact rotor. A granulation device characterized in that the stirring rotor and the impact rotor are each provided with driving means for rotating them at required rotational speeds. 3. The granulation device according to claim 2, wherein the impact rotor is arranged concentrically with the cylindrical container body and the stirring rotor. 4. The granulation device according to claim 2, wherein the rotational axis of the impact rotor is eccentric from the axis of the cylindrical container body and the stirring rotor. 5. The granulation apparatus according to claim 2, wherein the stirring rotor drive means is disposed outside one end of the cylindrical vessel, and the impact rotor drive means is disposed outside the other end of the cylindrical vessel. 6. The granulation device according to claim 2, wherein the impact rotor and the stirring rotor are rotated in opposite directions. 7. The granulation device according to claim 2, wherein the impact body protruding from the impact rotor is made of a continuous plate-like body from one end of the rotor to the other end, and is provided on the rotor at equal positions on the circumference. . 8 The impact body protruding from the impact rotor is composed of a long plate-like body divided into a plurality of pieces in the axial direction of the rotor, and is arranged so that the material is moved in the axial direction of the rotor by rotation of the impact rotor. A granulation device according to claim 2. 9. The granulation device according to claim 8, wherein the impact body protruding from the impact rotor is provided in a spiral arrangement on the surface of the rotor. 10. The granulation device according to claim 7, wherein the impact body protruding from the impact rotor is tilted in a spiral direction with respect to the axis of the impact rotor and protrudes from the surface of the rotor. 11. The granulation device according to claim 2, wherein the stirring element of the stirring rotor is tilted so that the material moving inside the container by the rotation of the impact rotor is moved in the opposite direction by the rotation of the stirring rotor. 12 The impact body is arranged so that the rotation of the impact rotor moves the material in the container from the center in the axial direction of the container toward both sides, and the rotation of the stirring rotor moves the material in the opposite direction. The granulation device according to claim 11, further comprising a stirring element. 13 The impact body is arranged so that the rotation of the impact rotor moves the material in the container in one direction along the axis of the container, and the stirring element is arranged so that the rotation of the stirring rotor moves the material in the opposite direction. A granulation device according to claim 11 provided.