JP2017177015A - Mixing granulator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a mixing granulator capable of producing particulate matters of appropriate particle size distribution and high density.SOLUTION: Provided is a mixing agitator 1 which includes: an agitation vessel 10; an agitation blade 20 which is provided inside the agitation vessel 10 and agitates a target placed into the agitation vessel 10 by rotating about a rotational axis 40 extended in a vertical direction; and shearing blades 30 which are disposed on an upper side along the vertical direction than the agitation blade 20 and apply a shear force to the target by rotating about the rotation axis 40. The shearing blades 30 are provided at least on three stages along the rotational axis 40, and occupancy of a volume Vof the sharing blades 30 with respect to a capacity Vof the agitation vessel 10 is set to be 36% or more and less than 100%.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a mixing granulator.

  2. Description of the Related Art Conventionally, apparatuses for mixing and granulating powder particles are used in various fields. For example, at present, a stirring blade (agitator) that rotates about a vertical rotation axis and a shear blade (chopper) that rotates about a horizontal rotation shaft are provided inside the stirring tank. An agitation granulation apparatus has been proposed that agitates the raw material charged into the inside of the slab while splashing with a stirring blade and performs granulation by crushing the stirred raw material with a shear blade (see, for example, Patent Documents 1 to 3). ).

  In recent years, instead of a shear blade that rotates about a horizontal rotation axis, a spiral flow generation blade or a dispersion blade that rotates about a vertical rotation axis (coaxial with the rotation axis of a stirring blade) is provided. A mixing granulator that mixes and granulates raw materials by causing these blades to function as shear blades has been proposed (see, for example, Patent Documents 4 to 6).

JP-A-5-236 JP-A-7-8882 JP 2004-202280 A JP 2005-40658 A JP 2011-83672 A JP2013-93140A

  However, even if a conventional mixing (stirring) granulating apparatus as disclosed in Patent Documents 1 to 6 is adopted, it is difficult to precisely control the granulation state, and the density of the produced granular material There was a problem that it was not possible to raise the value sufficiently.

  This invention is made | formed in view of this situation, and it aims at providing the mixing granulator which can manufacture the granular material which has moderate particle size distribution and high density.

  In order to achieve the above object, the mixing and granulating apparatus according to the present invention includes an agitating tank and an object introduced into the agitating tank by rotating around a rotating shaft provided in the agitating tank and extending in the vertical direction. A stirring blade that stirs the object, and a shear blade that is arranged vertically above the stirring blade and applies a shearing force to the object by rotating about the rotation axis. At least three stages are provided, and the volume occupation ratio of the shear blade with respect to the volume of the stirring tank is set to be 36% or more and less than 100%.

  When such a configuration is adopted, there are provided at least three stages (for example, eight stages) of shearing blades arranged vertically above the stirring blades and rotating coaxially with the stirring blades, and the volume occupied by these shearing blades. Since the rate is set to a specific value (from 36% to less than 100%), a high shear effect can be obtained. As a result, a granular material having an appropriate (relatively wide) particle size distribution and a high density can be produced. If the volume occupation rate of the shear blade is less than 36%, the density of the powder particles cannot be sufficiently increased, which is not preferable.

  In the mixing granulator according to the present invention, a bottomed hollow cylindrical stirring tank having a circular shape in plan view can be employed. In such a case, the ratio of the diameter of the shear blade to the inner diameter of the stirring tank can be set to 0.6 or more and less than 1.

  When such a configuration is adopted, since the ratio of the diameter of the shear blade to the inner diameter of the stirring tank of the bottomed hollow cylindrical body is set to a specific value (0.6 or more and less than 1), a high shear effect can be obtained. A granular material having an appropriate particle size distribution and high density can be produced. If the ratio of the diameter of the shear blade to the inner diameter of the stirring vessel is less than 0.6, it is not preferable because the density of the powder particles cannot be sufficiently increased.

  In the mixing and granulating apparatus according to the present invention, the stirring blade can be configured to stir while pushing up the object in the vertical direction by rotating about the rotation axis. In such a case, a shear blade having a base portion fixed to the rotating shaft and a blade portion provided so as to extend radially outward from the base portion is employed, and at least a part of the blade portion of the shear blade The cross-sectional shape can be a cross-sectional shape that generates a downward airflow in the vertical direction by rotating about the rotation axis.

  When such a configuration is adopted, the object can be pushed upward in the vertical direction by the rotation of the stirring blades, while the air flow downward in the vertical direction can be generated by the rotation of the shearing blades and the object can be moved downward in the vertical direction. . Accordingly, since a circulating flow of the object in the vertical direction can be generated inside the stirring tank, even an object having a specific gravity difference can be efficiently stirred and mixed.

  In the mixing granulator according to the present invention, the cross-sectional shape of the base side portion of the blade portion of the shear blade is a cross-sectional shape that generates a downward airflow in the vertical direction by rotating about the rotation axis, and the shear blade The cross-sectional shape of the tip side portion of the blade portion can be made to have a cross-sectional shape that generates an upward airflow in the vertical direction by rotating about the rotation axis.

  When such a configuration is adopted, the portion on the base side of the blade portion of the shear blade (the portion near the rotation axis) has a cross-sectional shape that generates a downward airflow in the vertical direction due to the rotation. An object can be moved vertically downward. On the other hand, the portion on the tip side of the blade portion of the shear blade (the portion near the inner wall of the stirring tank) has a cross-sectional shape that generates a vertically upward airflow by rotation, so it is near the inner wall of the stirring tank. A certain object can be moved vertically upward. Therefore, the flow of the object from the upper end side to the lower side of the shear blade can be generated inside the stirring tank, and the circulating flow can be generated more efficiently.

  In the mixing granulator according to the present invention, the trailing edge of the blade portion of the shear blade can be formed into a corrugated shape.

  If this configuration is adopted, the trailing edge of the blade portion of the shear blade is formed in a corrugated shape, so that a speed difference can be generated in the airflow along the trailing edge of the blade portion of the shear blade. By this, it is possible to effectively suppress the adhesion of the powder particles to the shear blade.

  In the mixing granulator according to the present invention, the upper and lower adjacent shear blades can be attached to the rotation shaft in a state where the blade portions are shifted by a predetermined angle in the rotation direction.

  Adopting such a configuration, because the shear blades adjacent to each other in the vertical direction are attached to the rotating shaft in a state where the blade portions are shifted by a predetermined angle (for example, 30 °) in the rotation direction, the adhesion of the granular material to the shear blades is effective. And the object can be efficiently stirred and mixed.

  In the mixing granulator according to the present invention, a stirring tank having a lid member for closing an opening provided in the upper part can be adopted. In such a case, a scraping blade for scraping off the granular material adhering to the upper part of the inner wall of the stirring tank can be provided inside the lid member.

  If this structure is employ | adopted, the granular material adhering to the inner wall upper part of a stirring tank can be scraped off with the scraping blade provided inside the cover member. Therefore, the yield can be improved.

  In the mixing granulator according to the present invention, a gap is formed between the inner wall of the stirring tank and the tip of the shear blade, and the dimension of the gap is set in a range of 1 to 40% with respect to the inner diameter of the stirring tank. be able to.

  When this configuration is adopted, a gap with a specific dimension (length of 1 to 40% with respect to the inner diameter of the stirring tank) is formed between the inner wall of the stirring tank and the tip of the shear blade. The object can be efficiently stirred and mixed inside.

  In the mixing granulator according to the present invention, the tip end portion of the stirring blade can be bent upward in the vertical direction, and the tip portion of the stirring blade can be positioned vertically above the bent portion of the stirring blade. Under the present circumstances, the front-end | tip part of a stirring blade can be located in the perpendicular direction upper direction only the length of 1/100-1/10 with respect to the length of the vertical direction of a stirring tank rather than the bending part of a stirring blade.

  When such a configuration is adopted, the tip of the stirring blade is bent upward in the vertical direction, and the tip of the stirring blade is positioned above the bent portion of the stirring blade in the vertical direction. Can be pushed upward in the direction.

  ADVANTAGE OF THE INVENTION According to this invention, it becomes possible to provide the mixing granulation apparatus which can manufacture the granular material which has moderate particle size distribution and high density.

It is a block diagram for demonstrating the structure of the mixing granulation apparatus which concerns on embodiment of this invention. It is an enlarged view for demonstrating the structure of the front-end | tip part of the stirring blade of the mixing granulation apparatus which concerns on embodiment of this invention. It is a top view of the shear blade | wing of the mixing granulation apparatus which concerns on embodiment of this invention. It is an enlarged view of the front-end | tip part (IV part of FIG. 3) of the blade | wing part of the shear blade of the mixing granulation apparatus which concerns on embodiment of this invention. It is a figure which shows the modification of the front-end | tip part of the blade | wing part of the shear blade of the mixing granulation apparatus which concerns on embodiment of this invention. It is sectional drawing in the VI-VI part of FIG. 3 of the blade | wing part of the shear blade of the mixing granulation apparatus which concerns on embodiment of this invention. It is sectional drawing which shows the modification of the blade | wing part of the shear blade of the mixing granulation apparatus which concerns on embodiment of this invention. It is sectional drawing which shows the modification of the blade | wing part of the shear blade of the mixing granulation apparatus which concerns on embodiment of this invention. It is sectional drawing which shows the modification of the blade | wing part of the shear blade of the mixing granulation apparatus which concerns on embodiment of this invention. It is a top view which shows the modification of the shear blade | wing of the mixing granulation apparatus which concerns on embodiment of this invention. It is a top view which shows the modification of the shear blade | wing of the mixing granulation apparatus which concerns on embodiment of this invention.

  Embodiments of the present invention will be described below with reference to the drawings. In addition, the following embodiment is a suitable application example to the last, Comprising: The application range of this invention is not limited to this.

  First, the structure of the mixing granulation apparatus 1 which concerns on embodiment of this invention is demonstrated using FIGS. As shown in FIG. 1, the mixing granulator 1 according to the present embodiment includes a stirring tank 10, a stirring blade (agitator) 20, and a shear blade (chopper) 30, and the inside of the stirring tank 10. The agitated object is stirred while jumping up with the stirring blade 20, and the agitated object is crushed with the shear blade 30 to perform mixing granulation.

  The stirring tank 10 is a bottomed hollow cylindrical body having a circular shape in a plan view, and a bottom wall 11 having a circular shape in a plan view arranged in a horizontal direction, and a direction perpendicular to the bottom wall 11 (vertical direction). And a lid member 13 that closes an opening provided in the upper part. Inside the lid member 13, scraping blades (scrapers) 14 for scraping off the powder particles adhering to the upper part of the inner wall of the stirring tank 10 are provided. The diameter of the bottom wall 11 and the height of the side wall 12 of the stirring tank 10 can be set as appropriate according to the composition and amount of the object to be introduced into the inside.

  The stirring blade 20 is provided inside the stirring tank 10 and rotates around a rotating shaft 40 extending in the vertical direction, thereby stirring the object put into the stirring tank 10. The stirring blades 20 are provided so as to extend radially outward from the rotary shaft 40, and a plurality (for example, 3 to 5) of stirring blades 20 are arranged at equal intervals along the circumferential direction. The agitating blade 20 in the present embodiment is configured to agitate the object while pushing it upward in the vertical direction by rotating around the rotation shaft 40, and as shown in FIGS. Is bent upward in the vertical direction.

  The shear blade 30 is arranged above the stirring blade 20 in the vertical direction, and applies a shearing force to the object by rotating around a rotation shaft 40 (coaxial with the rotation shaft 40 of the stirring blade 20). As shown in FIG. 3, the shear blade 30 includes a disk-shaped base portion 30 a fixed to the rotating shaft 40 and a blade portion 30 b provided so as to extend radially outward from the base portion 30 a. doing. In the present embodiment, as shown in FIG. 3, a plurality (three in this embodiment) of blade portions 30b are arranged at equal intervals along the circumferential direction, and the tip of the blade portion 30b is disposed as shown in FIG. The shape of the portion 31 is a linear shape extending in a direction (tangential direction) orthogonal to the radial direction. In addition, as shown in FIG. 5, it can also be set as the shape which notched the rotation direction front of the front-end | tip part 31 of the blade | wing part 30b.

As shown in FIG. 1, the shear blades 30 are provided at least in three stages (for example, eight stages) along the rotation axis 40, and the blade portions 30 b of the shear blades 30 adjacent to each other in the vertical direction have a predetermined angle ( For example, it is attached to the rotating shaft 40 in a shifted state. In this embodiment, the occupation rate of the volume V _S of the shear blade 30 with respect to the volume V ₀ of the stirring vessel 10 (volume occupation rate = (V _S / V ₀ ) × 100) is set to 36% or more and less than 100%. In addition, the ratio of the diameter D _S of the shear blade 30 to the inner diameter D ₀ of the stirring vessel 10 (diameter ratio = D _S / D ₀ ) is set to 0.6 or more and less than 1. If the volume occupancy of the shear blade 30 is less than 36% or the diameter ratio is less than 0.6, it is not preferable because the density of the granular material cannot be sufficiently increased.

Here, as shown in FIG. 1, the “volume V _S of the shear blade 30” means a virtual horizontal plane in contact with the lowest part of the structure including the lowermost shear blade 30 and the uppermost surface. A region surrounded by a virtual horizontal plane that is in contact with the top of the structure including the shear blade 30 and a virtual cylindrical curved surface that is in contact with the tip of each shear blade 30 (the portion closest to the inner surface of the side wall 12 of the stirring tank 10) (see FIG. 1 means the volume of the area A) shown in gray.

  In addition, the blade portion 30b of the shear blade 30 in the present embodiment has a cross-sectional shape that generates a downward airflow in the vertical direction by rotating about the rotation shaft 40. Specifically, as shown in the cross section in FIG. 6, the upper surface 32 of the blade portion 30b of the shear blade 30 is a flat surface, whereas the substantially central portion of the lower surface 33 is formed to swell downward. Has been. For this reason, since the velocity of the airflow flowing along the lower surface 33 is higher than the velocity of the airflow flowing along the upper surface 32 when the shear blade 30 rotates, the static pressure in the vicinity of the upper surface 32 is static in the vicinity of the lower surface 33. As a result, a vertically downward airflow is generated.

  In addition, the cross-sectional shape of the blade | wing part 30b of the shear blade | wing 30 is not limited to what is shown in FIG. 6, For example, cross-sectional shapes as shown in FIGS. 7-9 can also be employ | adopted. When the cross-sectional shape shown in FIG. 7 is adopted, the strength can be improved as compared with the cross-sectional shape shown in FIG. The cross-sectional shape shown in FIG. 8 can be manufactured by a simpler process than the cross-sectional shapes shown in FIGS. When the cross-sectional shape shown in FIG. 9 is adopted, the shearing of the object can be prioritized over the generation of the downward airflow in the vertical direction.

  Further, the planar shape of the shear blade 30 is not limited to that shown in FIG. 3, and for example, a planar shape as shown in FIG. 10 or FIG. 11 can be adopted. The planar shape shown in FIGS. 10 and 11 has an arcuate shape in plan view such that the tip 31 of the blade portion 30b of the shear blade 30 is located rearward in the rotational direction. Moreover, the example shown in FIG. 11 forms the trailing edge 34 of the blade | wing part 30b of the shear blade | wing 30 in the waveform. By doing in this way, a speed difference can be generated in the airflow along the trailing edge 34 of the blade portion 30b of the shear blade 30, and the adhesion of the granular material to the shear blade 30 is effective due to the speed difference of the airflow. Can be suppressed. The waveform is not limited to a sine wave shape as shown in FIG. 11, and a sawtooth waveform, a rectangular waveform, a trapezoidal waveform, or the like may be adopted.

  A gap is formed between the inner wall of the stirring tank 10 (the inner surface of the side wall 12) and the tip portion 31 of the blade portion 30b of the shear blade 30. The size of the gap is preferably set in the range of 1 to 40% with respect to the inner diameter of the stirring vessel 10, and particularly preferably set to about 2 to 30%. When the gap size is less than 1% with respect to the inner diameter of the stirring tank 10, it is considered that the powder particles are caught. On the other hand, when the gap size is larger than 40% with respect to the inner diameter of the stirring tank 10, the shear blade The granular material does not contact 30 and in any case, the granular material cannot be mixed efficiently.

  In the mixing granulator 1 according to the embodiment described above, a plurality of stages of shear blades 30 are provided along the rotation axis 40 and are arranged above the stirring blade 20 in the vertical direction and rotate coaxially with the stirring blade 20. Since the volume occupancy of these shear blades 30 is set to a specific value (36% or more and less than 100%), a high shear effect can be obtained. As a result, a granular material having an appropriate (relatively wide) particle size distribution and a high density can be produced.

Further, in the above mixing granulating apparatus 1 according to the embodiment described, the ratio of the specific value of the diameter D _S of the shear blade 30 to the inner diameter D ₀ of the stirred tank 10 having a bottom hollow cylinder (0.6 or 1 Therefore, a high shearing effect can be obtained, and a granular material having an appropriate particle size distribution and high density can be produced.

  In the mixing granulator 1 according to the embodiment described above, the object can be pushed upward in the vertical direction by the rotation of the stirring blade 20, while the air flow downward in the vertical direction is generated by the rotation of the shear blade 30. The object can be moved vertically downward. Therefore, since a circulating flow of the object in the vertical direction can be generated inside the stirring tank 10, even an object having a specific gravity difference can be efficiently stirred and mixed.

  Moreover, in the mixing granulator 1 which concerns on embodiment described above, when the trailing edge 34 of the blade | wing part 30b of the shear blade 30 was formed in the waveform, it followed the trailing edge 34 of the blade | wing part 30b of the shear blade 30. A speed difference can be generated in the air flow, and the adhesion of the powder particles to the shear blade 30 can be effectively suppressed by the speed difference of the air flow.

  Moreover, in the mixing granulation apparatus 1 which concerns on embodiment described above, the shear blade | wing 30 adjacent up and down is attached to the rotating shaft in the state which shifted the blade | wing part 30b by the predetermined angle (for example, 30 degrees) in the rotation direction. For this reason, it is possible to effectively suppress adhesion of the granular material to the shear blade 30 and to efficiently stir and mix the object.

  Moreover, in the mixing granulator 1 which concerns on embodiment described above, the granular material adhering to the inner wall upper part of the stirring tank 10 is scraped off by the scraping blade 14 provided inside the cover member 13 of the stirring tank 10. Can be dropped. Therefore, the yield can be improved.

  Moreover, in the mixing granulation apparatus 1 which concerns on embodiment described above, between the inner wall of the stirring tank 10 and the front-end | tip part 31 of the shear blade 30, it is 1-40% with respect to a specific dimension (with respect to the internal diameter of the stirring tank 10). Therefore, the object can be efficiently stirred and mixed in the stirring tank 10.

  Moreover, in the mixing granulator 1 which concerns on embodiment described above, the front-end | tip part of the stirring blade 20 is bent in the perpendicular direction upper direction, and the front-end | tip part 21 of the stirring blade 20 is perpendicular to the bending part 22. Since it is configured to be positioned above, the object can be efficiently pushed upward in the vertical direction.

  Next, examples and comparative examples of the present invention will be described. The following 1st-3rd Example and 1st-2nd comparative example show the example which manufactured the iron-type oxygen absorber, The 4th-6th Example and the 3rd-4th comparative example are The example which manufactured the glycerin type oxygen absorber is shown. In the following examples and comparative examples, “parts” and “%” are based on weight.

<First Example>
First, the first embodiment will be described. In the mixing granulator 1 in the present embodiment, together with an inside diameter D ₀ to adopt stirred tank 10 of 400 mm, (structure comprising a base 30a and three blade portion 30b) the diameter D _S is the shear blade 30 of 350mm 8 were used, and these shear blades 30 were arranged along the rotation axis 40 at intervals of 10 mm. At this time, the dimension from the virtual horizontal plane that is in contact with the lowermost portion of the lowermost shear blade 30 to the virtual horizontal plane that is in contact with the uppermost portion of the uppermost shear blade 30 is the height inside the stirring vessel 10. It was 0.99 times (0.99 L) of L. Occupancy (= (V _S / V ₀ ) of volume V _S (= (175) ² × π × 0.99 L) of shear blade 30 with respect to volume V ₀ (= (200) ² × π × L) of stirring tank 10 ) × 100) is 75.80 (= 175/200) ² × 0.99 × 100) (%), and the ratio of the diameter D _S of the shear blade 30 to the inner diameter D ₀ of the stirring vessel 10 (= D _S / D ₀ ) was 0.875 (= 350/400).

  In this example, iron powder 53.9% (manufactured by Höganäs), sodium chloride 3.7%, powdered activated carbon 5.1% (manufactured by Phutamura Chemical Co., Ltd.), granular diatomaceous earth 11.1% (Isolite Kogyo Co., Ltd.) Prepared), powdered slaked lime 2.0% (manufactured by Chichibu slaked lime company), bentonite 2.0% (manufactured by Kunimine Kogyo Co., Ltd.), carboxylmethylcellulose 0.2%, water 23.0%, 5 kg of oxygen scavenger composition is prepared did.

  Then, the prepared oxygen scavenger composition is put into the agitation tank 10 of the mixing granulation apparatus 1 configured as described above, and the agitation blade 20 and the shear blade 30 are rotated 300 times for 5 minutes to obtain a granulated product. Got. Next, the “discharge yield” is calculated by dividing the weight of the granulated material discharged from the mixing granulator 1 by the weight of the charged composition, and the discharged granulated material is calculated from the weight of the charged composition. The “in-machine residue” was calculated by reducing the weight of. Subsequently, the loose apparent density of the obtained granulated product was evaluated using a powder tester (manufactured by Hosokawa Micron Corporation).

<Second Example>
Next, a second embodiment will be described. In the mixing granulator 1 in the present embodiment, the diameter D _S is adopted shearing blades 30 of 320 mm, except it was evaluated under the same conditions as the first embodiment. Occupancy (= (V _S / V ₀ ) of the volume V _S (= (160) ² × π × 0.99 L) of the shear blade 30 with respect to the volume V ₀ (= (200) ² × π × L) of the stirring vessel 10. ) × 100) is 63.36 (= 160/200) ² × 0.99 × 100) (%), and the diameter D _S (= D _S / D ₀ ) of the shear blade 30 with respect to the inner diameter D ₀ of the stirring vessel 10. ) Ratio was 0.8 (= 320/400).

<Third embodiment>
Next, a third embodiment will be described. In the mixing granulator 1 in the present embodiment, the diameter D _S is adopted shearing blades 30 of 240 mm, except it was evaluated under the same conditions as the first embodiment. Occupancy (= (V _S / V ₀ ) of the volume V _S (= (120) ² × π × 0.99 L) of the shear blade 30 with respect to the volume V ₀ (= (200) ² × π × L) of the stirring tank 10. ) × 100) is 35.64 (= 120/200) ² × 0.99 × 100) (%), and the diameter D _S (= D _S / D ₀ ) of the shear blade 30 with respect to the inner diameter D ₀ of the stirring vessel 10. ) Ratio was 0.6 (= 240/400).

<First comparative example>
Next, a first comparative example will be described. In this comparative example, instead of the mixing granulator 1 according to the present invention, a mixing granulator (made by Dalton, trade name: SPG-20L) that does not have a shear blade is adopted, and otherwise the first embodiment. Evaluation was performed under the same conditions as in the examples.

<Second comparative example>
Next, a second comparative example will be described. In this comparative example, it replaces with the mixing granulation apparatus 1 which concerns on this invention, the mixing granulation apparatus (The Dalton company make, brand name: SPG-20L) which does not have a shear blade is employ | adopted, and is the same as that of a 1st Example. The oxygen scavenger composition prepared in the above was put into the mixing granulator, and the stirring blade was rotated 200 times for 3 minutes to obtain a granulated product. Subsequently, the obtained granulated material is put into a pressure molding machine (trade name: MRCP-200, manufactured by Kurimoto Iron Works), and extrusion and roll compression (roll compression linear pressure 2.) are performed using this pressure molding machine. 5 t / cm) to obtain a plate-like press-molded product having a thickness of 0.8 mm obtained by compressing the bulk volume to about 1/3. Subsequently, the obtained plate-like pressure-molded product was passed through a granulator to prepare a granular oxygen scavenger composition having a particle size of about 2 mm. Thereafter, the other methods were evaluated in the same manner as in the first example.

The results of the first to third examples and the first to second comparative examples are summarized in Table 1 below.

As is apparent from the above results, the occupation ratio (volume occupation ratio) of the volume V _S of the shear blade 30 with respect to the volume V ₀ of the stirring tank 10 is set to 36% or more, and the inner diameter D ₀ of the stirring tank 10 is set. in the first to third embodiments employing the mixing granulator 1 the ratio of the diameter D _S is set to 0.6 or more shear blade 30, an apparent density of the granulated product obtained was 1.5 ( g / mL), whereas in the first to second comparative examples employing a mixing granulator that does not have a shear blade, the apparent density of the obtained granulated product is 1.5 (g / mL). (mL) was not reached.

<Fourth embodiment>
Next, a fourth embodiment will be described. In the present embodiment, the mixing granulator 1 as in the first embodiment (the occupation ratio of the volume V _S of the shear blade 30 to the volume V ₀ of the stirring tank 10 is 75.80%, and the inner diameter of the stirring tank 10 is The ratio of the diameter D _S of the shear blade 30 to D ₀ is 0.875).

  Further, in this example, 85% glycerin 100 parts (36.1%), manganese chloride 2.57 parts (0.9%), 5-methylresorcinol 0.71 part (0.3%), water 51 A composition comprising 8 parts (18.7%) and 8.9 parts (3.2%) of powdered silica is prepared, and the prepared composition is put into the mixing granulator 1 and mixed to obtain a slurry. After that, 111.2 parts (40.3%) of powdered slaked lime was added to obtain a two-layered spherical granulated product. Thereafter, 1 part (0.4%) of hydrophobic silica was coated to obtain a final granulated product.

  Next, the “discharge yield” is calculated by dividing the weight of the granulated material discharged from the mixing granulator 1 by the weight of the charged composition, and the discharged granulated material is calculated from the weight of the charged composition. The “in-machine residue” was calculated by reducing the weight of. Subsequently, the loose apparent density of the obtained granulated product was evaluated using a powder tester (manufactured by Hosokawa Micron Corporation).

<Fifth embodiment>
Next, a fifth embodiment will be described. In the present embodiment, the mixing granulator 1 as in the second embodiment (the occupation ratio of the volume V _S of the shear blade 30 to the volume V ₀ of the stirring tank 10 is 63.36%, and the inner diameter of the stirring tank 10 is The ratio of the diameter D _S of the shear blade 30 to D ₀ was 0.8), and the other conditions were evaluated under the same conditions as in the fourth example.

<Sixth embodiment>
Next, a sixth embodiment will be described. In the present embodiment, the mixing granulator 1 as in the third embodiment (the occupation ratio of the volume V _S of the shear blade 30 to the volume V ₀ of the stirring tank 10 is 35.64%, and the inner diameter of the stirring tank 10 is The ratio of the diameter D _S of the shear blade 30 to D ₀ was 0.6), and the other conditions were evaluated under the same conditions as in the fourth example.

<Third comparative example>
Next, a third comparative example will be described. In this comparative example, as in the first comparative example, a mixing granulator (manufactured by Dalton, trade name: SPG-20L) having no shear blades is used, and other conditions are the same as in the fourth embodiment. Evaluation was performed.

<Fourth comparative example>
Next, a fourth comparative example will be described. In this comparative example, as in the first comparative example, a mixing granulator (manufactured by Dalton, trade name: SPG-20L) that does not have a shear blade is adopted, and 100 parts (36.1%) of 85% glycerin, Manganese chloride 2.57 parts (0.9%), 5-methylresorcinol 0.71 parts (0.3%), water 51.8 parts (18.7%), powdered silica 8.9 parts (3.2 %) And 111.2 parts (40.3%) of powdered slaked lime, and the prepared composition is put into the mixing granulator, and the stirring blade is rotated 200 times for 3 minutes and mixed. To obtain a granulated product. Next, the obtained granulated product was put into a pressure molding machine (trade name: MRCP-200, manufactured by Kurimoto Iron Works), and roll compression (roll compression linear pressure 2.5 t / min) was performed using this pressure molding machine. cm), but it became a clay and could not be molded. It was the same even when the roll compression linear pressure was lowered to 1.0 t / cm.

The results of the fourth to sixth examples and the third to fourth comparative examples are summarized in Table 2 below.

As is apparent from the above results, the occupation ratio (volume occupation ratio) of the volume V _S of the shear blade 30 with respect to the volume V ₀ of the stirring tank 10 is set to 36% or more, and the inner diameter D ₀ of the stirring tank 10 is set. In the fourth to sixth examples employing the mixing granulator 1 in which the ratio of the diameters D _S of the shear blades 30 is set to 0.6 or more, the apparent density of the obtained granulated product is 0.8 ( g / mL), whereas in the third to fourth comparative examples adopting the mixing granulator having no shear blade, the apparent density of the obtained granulated product was 0.8 (g / mL). (mL) was not reached.

  In the above embodiment, an example in which the shear blade 30 including the blade portion 30b having a cross-sectional shape that generates a vertically downward airflow by rotating around the rotation shaft 40 has been shown. The cross-sectional shape of the blade portion 30b of the shear blade 30 is not limited to this.

  For example, the cross-sectional shape of the portion on the root side of the blade portion 30b of the shear blade 30 is set to a cross-sectional shape that generates a downward airflow in the vertical direction by rotating around the rotation shaft 40, and the blade portion 30b of the shear blade 30 The cross-sectional shape of the tip-side portion can be a cross-sectional shape that generates an upward airflow in the vertical direction by rotating about the rotation shaft 40. In this case, since the portion on the base side of the blade portion 30b of the shear blade 30 (the portion near the rotation shaft 40) has a cross-sectional shape that generates a vertically downward airflow by rotation, the rotation shaft The object in the vicinity of 40 can be moved downward in the vertical direction. On the other hand, the portion on the tip side of the blade portion 30b of the shear blade 30 (the portion near the inner wall of the stirring tank 10) has a cross-sectional shape that generates a vertically upward airflow by rotation. The object in the vicinity of the inner wall can be moved upward in the vertical direction. Therefore, in the stirring tank 10, the flow of the object from the upper end side of the blade portion 30b of the shear blade 30 to the lower side of the root can be generated, and the circulating flow can be generated more efficiently.

  The present invention is not limited to the above-described embodiments, and those in which those skilled in the art appropriately modify the design are included in the scope of the present invention as long as they have the features of the present invention. . In other words, each element included in the embodiment and its arrangement, material, condition, shape, size, and the like are not limited to those illustrated, and can be appropriately changed. Moreover, each element with which the said embodiment is provided can be combined as much as technically possible, and the combination of these is also included in the scope of the present invention as long as it includes the features of the present invention.

DESCRIPTION OF SYMBOLS 1 ... Mixing granulator 10 ... Agitation tank 11 ... Bottom wall 13 ... Lid member 14 ... Scraping blade 20 ... Agitation blade 21 ... Tip part 22 ... Bending part 30 ... Shear blade 30a ... Base part 30b ... Blade part 34 ... Back Edge 40 ... Rotating shaft

Claims (11)

A stirring vessel, a stirring blade that stirs an object placed in the stirring vessel by rotating around a rotating shaft that is provided inside the stirring vessel and extends in the vertical direction, and is more vertical than the stirring blade. A mixing granulator comprising: a shear blade disposed above and applying a shear force to the object by rotating about the rotation axis;
The shear blade is provided in at least three stages along the rotation axis,
The volume granulation apparatus of the shear blade with respect to the volume of the stirring tank is set to 36% or more and less than 100%. The stirring tank is a bottomed hollow cylindrical body having a circular shape in plan view,
The mixing granulator according to claim 1, wherein a ratio of a diameter of the shear blade to an inner diameter of the stirring tank is set to 0.6 or more and less than 1. The stirring blade is configured to stir while pushing up the object upward in the vertical direction by rotating around the rotating shaft,
The shear blade has a base portion fixed to the rotating shaft, and a blade portion provided so as to extend radially outward from the base portion,
The mixing according to claim 1 or 2, wherein at least a part of the blade portion of the shear blade has a cross-sectional shape that generates a vertically downward airflow by rotating about the rotation axis. Granulator. A portion on the base side of the blade portion of the shear blade has a cross-sectional shape that generates a downward airflow in the vertical direction by rotating about the rotation axis,
4. The mixed structure according to claim 3, wherein a portion of the shear blade on a tip side of the blade portion has a cross-sectional shape that generates a vertically upward airflow by rotating about the rotation shaft. Grain device. The shear blade has a base portion fixed to the rotating shaft, and a blade portion provided so as to extend radially outward from the base portion,
The mixing granulator according to any one of claims 1 to 4, wherein a trailing edge of the blade portion of the shear blade is formed in a corrugated shape. The shear blade has a base portion fixed to the rotating shaft, and a blade portion provided so as to extend radially outward from the base portion,
The mixing granulator according to any one of claims 1 to 5, wherein the upper and lower adjacent shear blades are attached to the rotary shaft in a state where the blade portions are shifted by a predetermined angle in the rotation direction. The agitation tank has a lid member that closes an opening provided in the upper part,
The mixing granulator according to any one of claims 1 to 6, wherein a scraping blade is provided inside the lid member to scrape off the granular material adhering to the upper part of the inner wall of the stirring tank. A gap is formed between the inner wall of the stirring tank and the tip of the shear blade,
The size of the said gap | interval is a mixing granulation apparatus as described in any one of Claim 1 to 7 set to the range of 1-40% with respect to the internal diameter of the said stirring tank.   9. The stirring blade according to claim 1, wherein a tip portion of the stirring blade is bent upward in the vertical direction, and a tip portion of the stirring blade is configured to be positioned vertically above the bending portion. A mixing granulator according to claim 1.   The tip portion of the stirring blade is disposed so as to be positioned above the folding portion by a length of 1/100 to 1/10 of the vertical length of the stirring tank. The mixing granulator according to claim 9.   The mixing granulator according to any one of claims 1 to 10, wherein the shear blade is provided in eight stages along the rotation axis.

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