JP2017064670A - Rolling granulator and rolling granulation method - Google Patents

Abstract

The present invention provides a rolling granulation apparatus and a rolling granulation method capable of producing a granulated product with low density, sharp particle size distribution, and less unevenness of hardness and moisture content in the particles at low cost. To do. A rolling granulator of the present invention comprises a cylindrical body 4 supported by a roller 2 and rotating inside a cylindrical body 4, a hydration space 6 having a powder raw material inlet 17 and a hydration means 7, and a cylindrical shape. A spherical medium 11 is provided inside the first net 9, and a pulverizing space 10 for extruding a lump containing moisture flowing in from the hydration space 6 through the first net 9 is formed on the outer periphery of the pulverizing space 10. And a sizing space 14 composed of a second net 13 having a smaller mesh size than the first net 9 formed. [Selection] Figure 1

Description

  The present invention relates to a rolling granulation apparatus and a rolling granulation method capable of obtaining a granulated product containing moisture and having a low density and a sharp particle size distribution from a powder raw material.

  Rolling granulation is often used to obtain a high-density granulated product (Patent Document 1). Moreover, it is possible to adjust the granulated product density by changing the pre-kneading time and the operation residence time. Furthermore, rolling granulation can minimize the force applied to the raw material powder compared to stirring granulation and forced granulation, so it is possible to granulate with low density without breaking the shape of the raw material. is there.

  In order to obtain a low-density granulated product using rolling granulation, agar is mixed with a powder raw material as a binder, and spray drying, rolling granulation, or stirring granulation is performed (Patent Document 2). Has been proposed. However, this method requires a heating step in order to dissolve the agar, which increases the cost of the apparatus. This method cannot be used when the type of binder is limited. Therefore, it is necessary not to adjust the density of the granulated product by selecting the binder but to adjust it to a low density by the structure of the granulator.

  In addition, the plant powder is granulated with water as a granulation medium, dried, and then tumbled and heated while spraying the liquid organic polymer substance in a heating type rotating drum, thereby bringing the organic polymer substance into the grain surface layer. A method for producing low-density porous carbon particles (Patent Document 3) is proposed in which the particles are cured at the portion and then the carbon is fired and carbonized. However, this method also requires heating, and further, a difference in hardness and moisture content occurs in one particle.

  Further, as a method for preventing clogging when the granulated product is sieved with a net, there is a method of hitting the net with a tapping ball from below the net (Patent Document 4). However, if the granulated product is classified by this method, the granulated product larger than the mesh will collide with the side of the mesh or the container until the shape collapses, and it will be consolidated or remain as a large lump on the mesh. . Therefore, the density of the granulated product is increased, and the yield of a desired particle diameter is deteriorated. For this reason, a lump larger than the desired particle size needs to be pulverized before sieving.

  Furthermore, a media agitation type wet pulverizer (Patent Document 5) has also been proposed in which a rotating cylindrical stirring unit is filled with a medium and a processed material pulverized by the medium is discharged from a slit. However, in this apparatus, the processed material collides with the media many times before it reaches the slit after being pulverized, so that many powders smaller than the desired particle size are generated and the particle size distribution is deteriorated. Further, since the fine particles generated due to the wet process are repeatedly agglomerated and pulverized, high density particles are discharged. For this reason, the powder with the desired particle size is classified again without colliding with the media, and after classification, the particles are sized so that there are no irregularities on the surface of the granulated product with the fine powder removed, and discharged outside the apparatus. It will be necessary.

  As described above, the conventional granulation technique is not suitable for producing a granulated product with low density, sharp particle size distribution, and less unevenness of hardness and moisture content in the particles at low cost. there were.

Japanese Patent No. 3743012 Japanese Patent No. 4182392 Japanese Patent Publication No.8-25732 Japanese Patent No. 3840764 Japanese Patent No. 5406431

  Therefore, the object of the present invention is to solve the above-mentioned conventional problems, and by adding water to the powder raw material and rolling, the particle size distribution is low at low density, and the hardness and moisture content in the particles are uneven. It is to provide a rolling granulation apparatus and a rolling granulation method capable of producing a granulated product having a small amount at low cost.

  The rolling granulation apparatus of the present invention made to solve the above problems includes a cylindrical space that is supported by a roller and rotates, a hydration space provided with a powder raw material inlet and hydration means, and a cylinder. A spherical medium is provided in the shape of the first net, and a pulverizing space in which a mass containing moisture flowing in from the water space is pushed out through the first net by the medium and arranged so as to surround the outer periphery of the pulverizing space And a sizing space comprising a second mesh having a smaller mesh size than the first mesh.

  As in claim 2, it is preferable to provide a cover plate having holes for discharging the granulated product from the sizing space at the rear ends of the pulverizing space and the sizing space. Moreover, it is preferable that the 2nd net | network which forms sizing space is a taper shape which diameter-expands toward a rear end like Claim 3.

  Moreover, the rolling granulation method of the present invention uses the rolling granulation apparatus according to claim 1 to add water to the powder raw material in a hydration space and roll and agglomerate containing water obtained by stirring. By moving to the pulverization space and rolling it, allowing it to pass through the first net and dropping it into the sizing space, removing the fine powder in this sizing space, rolling it out and taking it out To do.

  In the present invention, rolling is performed after adding water to the raw material powder in the hydration space, and the lump is pulverized on the first net, so the time it takes to reach the desired size is shortened. be able to. Thereby, it is possible to make a lump having low density and less unevenness in hardness and moisture content in the particles. Further, this lump is sized on the second net having a smaller mesh size than the first net, but at this time, the fine powder falls through the second net, so the sizing is performed in an environment without fine powder. can do. For this reason, fine powder does not adhere to the granulated product, and a granulated product having a sharp particle size distribution can be obtained. In the present invention, since heating of the binder is unnecessary, a granulated product having a small hardness and moisture unevenness can be obtained, and since a special binder is unnecessary, granulation can be performed at low cost.

It is a center longitudinal cross-sectional view of the rolling granulation apparatus of embodiment. It is a right view of the rolling granulation apparatus of embodiment. It is AA sectional drawing of FIG.

Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a central longitudinal sectional view of a rolling granulation apparatus according to the present invention, wherein 1 is a base and 2 is a roller provided on the base 1. As shown in FIG. 2, the rollers 2 are arranged in pairs on the left and right, and are rotated in the same direction by the motor 3.

  A cylindrical body 4 is supported on these rollers 2 and is rotated in a certain direction. As shown in FIG. 1, the cylindrical body 4 is configured such that the left front half portion has a small diameter and the right rear half portion has a large diameter. The diameter of the first half is, for example, 160 to 500 mm, and the rotational peripheral speed is, for example, 0.067 to 0.133 m / s. Note that a disk 5 having the same diameter as the latter half is provided at the front end of the cylindrical body 4 so that the contact diameter between the cylindrical body 4 and the roller 2 is the same. In FIG. 1, the rotation axis of the cylindrical body 4 is horizontal, but it can be slightly inclined so that the rear end of the right side is lowered.

  A water addition space 6 is formed in the first half of the cylindrical body 4. The hydration space 6 is provided with a hydration means 7 such as a spray nozzle, and water is added to the powder raw material introduced from the introduction port 17 on the end face of the cylindrical body 4 by the introduction means 18 such as a vibration feeder. The powder raw material to which moisture is added rolls and stirs as the cylindrical body 4 rotates, and a lump W containing moisture is formed. The lump W has no stickiness on the surface. In addition, CMC, PVA, and other arbitrary binders can be added to the powder raw material in advance.

  A coarse net 8 having a large mesh opening is provided at the rear end of the hydration space 6, that is, at a position where the diameter of the cylindrical body 4 increases. The opening is, for example, 10 to 20 mm, and a coarse lump W larger than this is dammed, and only a lump W smaller than this is allowed to pass. A ring-like weir 20 is provided on the outer periphery of the coarse net 8 so that a predetermined amount of powder raw material can be stored in the hydration space 6.

  A crushing space 10 surrounded by a cylindrical first net 9 is formed at the center of the latter half of the cylindrical body 4. The opening of the first net 9 is, for example, about 1 to 2 mm. A spherical medium 11 is accommodated inside the grinding space 10 and rolls on the first net 9 as the cylindrical body 4 rotates.

  For this reason, the lump W containing water that has flowed from the hydration space 6 through the coarse mesh 8 having a large opening into the pulverization space 10 is pushed downward through the first mesh 9 while being crushed by the media 11. . For example, a ceramic ball can be used as the medium 11, but is not limited thereto.

  As shown in FIG. 1, since the lid plate 12 is provided at the rear end of the pulverization space 10, the media 11 and the lump W containing water are not discharged to the outside.

  On the outer periphery of the pulverization space 10, a sizing space 14 composed of a second net 13 having a smaller mesh size than the first net 9 is arranged so as to surround the pulverization space 10. The opening of the second net 13 is, for example, about 0.5 to 1 mm. In this embodiment, the second net 13 has a taper shape whose diameter increases toward the rear end, but may be a cylindrical shape. The inclination angle of the second net 13 with respect to the horizontal plane when tapered is preferably about 3 °.

  The lump W having a particle diameter of about 1 to 2 mm dropped from the pulverization space 10 to the sizing space 14 is sized while rolling on the second net 13, and becomes a granulated product. The fine powder having a particle diameter smaller than the mesh opening of the net 13 falls downward and is discharged from the gap 15 at the rear end of the cylindrical body 4. For this reason, in the sizing space 14, the sizing proceeds in an environment without fine powder, and the fine powder does not adhere to the granulated product.

  Although the rear end of the sizing space 14 is covered with the cover plate 12, a large number of holes 16 for discharging the granulated product from the sized space 14 are formed in the cover plate 12 in the circumferential direction as shown in FIG. Has been. Therefore, the granulated product sized in the sizing space 14 is taken out from the hole 16.

  If the rolling granulation apparatus of the present invention configured as described above is used, water is added to the raw material powder in the hydration space 6 to roll to form a mass W containing water, and this mass is pulverized. In the space 10, the material 11 is crushed on the first net 9. For this reason, it is possible to shorten the time required for the force to reach the desired size of the lump W, and it is possible to make a lump W having a low density and less unevenness in hardness and moisture content in the particles. Furthermore, this lump W is sized in an environment free from fine powder in the sized space 14, and a granulated product having a sharp particle size distribution can be obtained.

  Although the kind of the target granulated product manufactured by the technique of the present invention is not limited at times, it can be suitably used for manufacturing a granulated product for electronic materials including batteries, for example. In this case, a granulated product having a smooth surface shape and a sharp particle size distribution is required. Examples are shown below.

  In this example, a granulated product was manufactured using the rolling granulator described in the above embodiment. The rotational peripheral speed of the cylindrical body is 0.1 m / s.

  First, 1% by mass of CMC was externally added to 80% by mass of graphite (Nippon Graphite Industries Co., Ltd. CGB-15), and mixed for 3 minutes with a desktop mixer. The mixture was charged into the hydration space of the cylindrical body by a vibrating feeder at a charging rate of 60 g / min.

  After the amount of the mixture in the hydration space reached 1/3 to 1/2 of the weir 20, water was added from the spray nozzle at a rate of 18 mL / min in parallel with the supply of the mixture. In the hydration space, the granulated product having a larger particle size gathers at the upper part than the one having a smaller particle size, so that the granulated product was pushed out by the mixture supplied later and moved from the hydrated space to the grinding space.

  The granulated product moved to the pulverization space was pushed out by the media while rolling on the first net having an opening of 1 mm, and dropped into the sizing space. The dropped granulated product was sized while rolling on the second net having an opening of 0.5 mm, but the fine powder fell to less than 0.5 mm through the second net and was excluded. The granulated product was sized so as to eliminate surface irregularities, and discharged from the hole in the cover plate.

  The obtained granulated product had a particle size of 0.5 to 1 mm, a water content of 20%, a loose bulk density of 0.7 g / cc, and had a smooth surface shape. The particle size distribution was 27% as a CV value, and it was confirmed that the particle size distribution had a sharp particle size distribution.

DESCRIPTION OF SYMBOLS 1 Base 2 Roller 3 Motor 4 Cylindrical body 5 Disc 6 Hydrolysis space 7 Hydrolysis means 8 Coarse net 9 First net 10 Grinding space 11 Media 12 Cover plate 13 Second net 14 Size control space 15 Clearance 16 Hole 17 Input port 18 Input means 20 weir W lump

Claims (4)

  A cylindrical space that is supported by a roller and rotates, and a hydration space provided with a powder raw material inlet and a hydration means, and a spherical medium inside a cylindrical first net, and flows from the hydration space. A pulverizing space for extruding a mass containing moisture through the first net by a medium, and a second net that is arranged so as to surround the outer periphery of the pulverizing space and has a smaller opening than the first net. A rolling granulator characterized by providing a grain space.   The rolling granulator according to claim 1, wherein a cover plate having a hole for discharging the granulated product from the sizing space is provided at the rear end of the pulverizing space and the sizing space.   The rolling granulator according to claim 1 or 2, wherein the second net forming the sizing space has a tapered shape whose diameter increases toward the rear end.   Using the tumbling granulator according to claim 1, adding water to the powder raw material in the hydration space, rolling and stirring the mass containing water obtained by stirring and moving to the pulverization space. Thus, the rolling granulation method is characterized in that the rolling granulation method is characterized in that it is allowed to pass through the first net and drop into a sizing space, and after further rolling while removing fine powder in this sizing space.

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