JP3927015B2 - Stirring apparatus and method for producing mixture - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a stirring device and a method for producing a mixture.
[0002]
[Prior art]
Conventionally, as disclosed in, for example, Japanese Patent Laid-Open No. 7-25679, a lightweight cellular concrete containing calcium silicate is carbonized to form a molded body excellent in moisture absorption / release (hereinafter referred to as “carbonic acid-cured molded body”). Is sometimes known as a technique. This carbonic acid-cured molded body is produced by mixing water with a main raw material mainly composed of lightweight aerated concrete granules, molding under pressure, and curing in a carbon dioxide atmosphere.
[0003]
Here, the mixing of the main raw material and water has been carried out using stirring equipment such as a mixer that is usually used in the ceramic manufacturing process. This mixer is provided with a stirring blade at the bottom of the container, and mixing is performed by charging the main raw material and water into the container and rotating the stirring blade.
[0004]
[Problems to be solved by the invention]
By the way, in the manufacturing process of a carbonic acid hardening molded object, a small amount of auxiliary materials may be added to a main material. In such a case, it is difficult to uniformly mix the main raw material, the auxiliary raw material, and water with the above-described mixing method using the normal stirring equipment. The cause is considered as follows.
[0005]
Typical materials produced by molding using powder raw materials include ceramic materials such as tiles, and these are produced by a method called powder molding or dry molding. Other methods for producing ceramic materials include plastic molding in which clay-shaped raw materials are molded using a potter's wheel or an extrusion molding machine, and cast molding in which slurry-shaped raw materials are cast into a mold, Powder molding has advantages over other manufacturing methods in that the product has high dimensional stability and high manufacturing efficiency, and is particularly suitable for molding plate products.
As a raw material used for this powder molding, a powdery or granular material is used, and its water content is 10% or less. When a dry auxiliary material such as a pigment is mixed with such a dry raw material, a mixed powder in which the auxiliary material is uniformly dispersed in the main raw material can be easily obtained by a commonly used stirring equipment. .
[0006]
However, in the production of carbonic acid-cured molded bodies, when a porous calcium silicate powder material having fine voids is used as a main raw material, water is added to the powder material for the following two reasons. .
[0007]
The first reason is that water has a function of promoting the carbonation reaction of calcium silicate in the carbonation curing after molding. That is, carbon dioxide is dissolved in the water contained in the molded body, while calcium ions are eluted from the calcium silicate into the water, which reacts to precipitate calcium carbonate, whereby hardening proceeds. The amount of water necessary for the reaction may be small, and it may be usually several% or more industrially.
The second reason is to ensure shape retention during pressure molding. When the porous powder is pressure-molded in a state of low water content, the expansion of the molded body increases at the stage of unloading and demolding after pressure molding, and the dimensional accuracy may be lowered. This is considered to be due to the fact that the air contained in the porous powder is not completely removed during pressurization and is compressed inside the material, which expands greatly at the stage of unloading and demolding. The moisture required to prevent this expansion varies depending on the powder particle size and pore distribution of the raw material, pressure, pressing time, size of the molded body, etc., but is generally about 25% or more with respect to the solid content of the raw material powder. Yes, preferably 30% or more. On the other hand, too much water in the raw material is not preferable because it takes time for dehydration by pressure molding and calcium necessary as a binder is eluted together with water. If the pressure dehydration is insufficient, delamination occurs in the molded body. Therefore, the amount of water is preferably 65% or less, more preferably 50% or less.
[0008]
For these reasons, water is added to the powder raw material so that the water content is in the range of 25% to 65% in the production of the carbonate-cured molded article. Within such a range of moisture content, the powder raw material will not be as dry as it was during drying. On the other hand, since the porous body adsorbs moisture not only between the particles but also in the pores, even if a considerable amount of water is added, it does not become a slurry. That is, the mixture is a wet powder with moisture, and loses the fluidity like a dry powder, but does not achieve the fluidity with a large amount of water. For this reason, it becomes difficult to mix the main raw material, the auxiliary raw material, and water uniformly.
[0009]
In particular, when the amount of the auxiliary material added is significantly smaller than that of the main material, or when a fiber that becomes difficult to be defibrated due to moisture is used as the auxiliary material, it becomes more difficult to perform uniform mixing. . Furthermore, if the auxiliary material is likely to float, such as fine powders such as organic fibers, pigments, adsorbents, etc., the main raw material and auxiliary material will be in a state of being vertically separated in the stirring equipment normally used. Uniform mixing becomes very difficult.
[0010]
As described above, if the mixing of the main raw material and the auxiliary raw material is not uniform, there is a possibility that the carbonized cured product may have dimensional variations, warp and side warp, and cracks and cracks. is there. In addition, if the mixing of the main raw material and the auxiliary raw material with water is not uniform, a difference in local carbonation reaction rate and a difference in shrinkage occur, and the warpage and side warp of the carbonized cured product increase. There is a risk of cracks and cracks. In particular, when manufacturing a large-sized molded body, such a problem becomes remarkable.
[0011]
The present invention has been made in view of the circumstances described above, and its purpose is to produce a stirrer capable of uniformly mixing a main raw material, an auxiliary raw material, and water when producing a mixture containing moisture, and It is to provide a method for producing a mixture.
[0012]
[Means for Solving the Problems]
  In order to solve the above-mentioned problem, the stirring device according to the invention of claim 1 comprises:A mixture containing a powdery main raw material, one or more auxiliary raw materials, and waterA container that can contain the mixture, a vertical axis stirring member that is provided at the bottom of the container and can rotate about a vertical rotation axis in the vertical direction, and the vertical axis stirring A horizontal axis agitating member that is rotatable around a horizontal rotation axis that is provided above the member in a direction that intersects the vertical rotation axis;The horizontal axis agitating member is provided at a position where the pair is displaced in the vertical direction.
[0013]
Here, as the main raw material of the present invention, lightweight cellular concrete containing calcium silicate, pulverized products of cement secondary products such as calcium sizing materials, ceramic sizing materials, concrete waste materials, cement sludge and the like can be used. Among these, the lightweight cellular concrete powder which pulverized the lightweight cellular concrete which has calcium silicate as a main component especially is preferable. Moreover, an aggregate etc. may be added to the main raw material as needed.
[0014]
In addition, as auxiliary materials of the present invention, functional materials such as fibers, pigments, VOC adsorbents, silica stone powder, feldspar powder, mica, pumice, diatomaceous earth, construction waste soil, and the like can be used. In particular, the present invention can be suitably applied to the case of using fibers that are difficult to be mixed with an ordinary mixer or the like in order to converge by adding water. In this case, as the fibers, glass fibers, inorganic fibers such as wollastonite, and organic fibers such as polypropylene, acrylic, vinylon, artificial or natural cellulose can be used, but the shape retention, product cutting workability, In consideration of the texture and the like, organic fibers are preferable, and vinylon is particularly preferable. The fiber length is preferably about 500 μm to 3 mm with less fuzz of the product. The aspect ratio (fiber length / fiber diameter) is preferably about 20 to 300. Furthermore, the addition amount of the fiber as an auxiliary material is preferably 10% by weight or less, more preferably 5% or less, with respect to the mixed raw material, that is, the sum of the main raw material and the auxiliary raw material. More preferably, it is 1.0% by weight.
[0015]
  Invention of Claim 2 is the stirring apparatus of Claim 1, Comprising:The rotation direction of the horizontal axis stirring member is a forward direction that moves in the same direction as the rotation direction of the vertical axis stirring member when a blade portion provided on the horizontal axis stirring member approaches the vertical axis stirring member. It is characterized by that.
[0016]
  Invention of Claim 3 is the stirring apparatus of Claim 1 or Claim 2, Comprising:The said container is equipped with the watering member which can sprinkle the said water in the rotation direction back position of the said vertical axis | shaft stirring member with respect to the said horizontal axis | shaft stirring member, It is characterized by the above-mentioned.
[0017]
  The invention of claim 44. The stirring device according to claim 3, wherein the water sprinkling member is capable of spraying the water along a rotation radius direction of the vertical axis stirring member and in a water sprinkling region extending from a rotation center to a peripheral portion of the container. It is characterized by being.
[0018]
  The invention of claim 5The mixture comprising a powdery main raw material, one or more auxiliary raw materials, and water, and the proportion of the auxiliary raw material is 10% or less with respect to the sum of the dry weight of the main raw material and the auxiliary raw material Is produced using the stirring device according to any one of claims 1 to 4, comprising: (a) While rotating the vertical axis agitating member, the main raw material is centered in the length direction when the upper end of the blade is provided on the horizontal axis agitating member. Charging into the container until the position is reached; (b) Charging the auxiliary material into the container; (c) Rotating the vertical axis stirring member and the horizontal axis stirring member to mix the main raw material and the auxiliary raw material to prepare a mixed raw material; (d) The step of spraying the water from the water sprinkling member while rotating the vertical axis stirring member and the horizontal axis stirring member and mixing the mixed raw material and water is performed.
[0021]
Operation of the invention and effect of the invention
According to the first aspect of the present invention, the stirring device is provided at the bottom of the container and rotatable about the vertical rotation axis in the vertical direction, and above the vertical axis stirring member. A horizontal axis stirring member that is rotatable around a horizontal rotation axis in a direction that intersects the vertical rotation axis is provided. According to such a configuration, the auxiliary raw material and water are diffused in the longitudinal direction in the mixing process in the main raw material with the rotation of the horizontal axis stirring member, and with the rotation of the vertical axis stirring member. Diffused laterally. In this way, the raw material, auxiliary raw material, and water are mixed effectively.
[0022]
For more effective mixing, it is preferable to uniformly mix the main raw material and the auxiliary raw material in a relatively dry state in advance and then add water to perform mixing. In such a case, when a porous powder material is used as the main raw material, the powder material may adsorb moisture in the air. At this time, for example, only a surface in contact with air in the powder material is moist (or dry), resulting in a locally high (or low) moisture content. It may become difficult to perform uniform mixing with.
[0023]
Even in such a case, according to the configuration of claim 1, it is unevenly distributed due to the vertical diffusion accompanying the rotation of the horizontal axis stirring member and the horizontal diffusion accompanying the rotation of the vertical axis stirring member. Moisture is diffused to make the entire moisture content uniform, and uniform mixing of raw materials, auxiliary raw materials and water can be easily performed.
[0024]
  Claim 1According to this invention, by providing a pair of horizontal axis | shaft stirring member in the position shifted | deviated to the up-down direction, the spreading | diffusion to the vertical direction of an auxiliary material can be performed more effectively.
[0025]
  Claim 2According to the invention, the rotation direction of the horizontal axis agitating member moves in the same direction as the rotation direction of the vertical axis agitating member when the blade portion provided in the horizontal axis agitating member approaches the vertical axis agitating member. The forward direction is assumed. According to such a configuration, the secondary raw material is smoothly mixed by the vertical rotational flow caused by the horizontal axis stirring member and the horizontal rotational flow caused by the vertical axis stirring member.
[0026]
  Claim 3According to this invention, the water sprinkling member can disperse water with respect to the horizontal axis agitating member at the rear position in the rotation direction of the vertical axis agitating member. Thereby, the mixed raw material with moisture can be quickly diffused downward, and the diffusion of water into the mixed raw material can be promptly performed.
[0027]
  Claim 4According to this invention, the water sprinkling member is capable of spraying water in the water sprinkling region extending from the rotation center to the peripheral edge of the container along the rotational radius direction of the vertical axis stirring member. According to such a configuration, the sprayed water is diffused concentrically by the rotation of the vertical axis stirring member, so that the water can be uniformly mixed in the entire mixed raw material.
[0029]
  Claim 5According to the invention, first, the main raw material is charged into the container while rotating the vertical axis stirring member. As a result, the main raw material is made uniform in the container, and the subsequent raw material can be easily mixed. In particular, when a porous powder material is used as the main raw material, the powder material may adsorb moisture in the air. At this time, for example, if the surface of the powder material has a high (or low) moisture content such that only the surface in contact with air is moist (or dry), It becomes difficult to perform uniform mixing. Even in such a case, by introducing the main raw material into the container while rotating the vertical axis stirring member in advance, the water content of the main raw material becomes uniform, and it is easy to perform subsequent mixing with the auxiliary raw material. Become.
[0030]
Further, the main raw material is charged until the upper end of the main raw material reaches the center position in the length direction of the blade portion located on the upper side with respect to the horizontal rotation axis. For this reason, at the time of mixing with the auxiliary material, the auxiliary material is pushed into the main material when the blade portion is rotated and its tip portion is submerged in the main material. Thereby, mixing with a main raw material and an auxiliary raw material can be performed effectively. In particular, it is effective when the auxiliary material is a material that easily floats.
[0031]
Further, the main raw material and the auxiliary raw material are mixed first, and then water is sprayed from the water sprinkling member. Thus, a uniform mixture can be produced by mixing the main raw material and the auxiliary raw material in a relatively dry state in advance.
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment embodying a stirring device and a method for producing a mixture according to the present invention will be described in detail with reference to FIGS.
[0032]
In FIG. 1, the stirring apparatus 1 of this embodiment is shown. The stirring device 1 is provided with a container 2 formed in a cylindrical shape with a bottom using, for example, stainless steel.
[0033]
An agitator 10 (corresponding to the vertical axis stirring member of the present invention) is provided at the bottom of the container 2. The agitator 10 has a structure in which upper and lower two-stage impellers 12 and 15 are attached to a vertical rotation shaft 11 that vertically protrudes upward from a central position on the bottom surface 3 of the container 2.
[0034]
The large impeller 12 on the lower stage side is provided with three large blade portions 14 extending in a direction orthogonal to the axial direction around a bearing portion 13 that is detachably fitted to the vertical rotating shaft 11 from above. It has a shape. The large blade portion 14 is formed in a plate shape whose length reaches the inner peripheral surface 4 of the container 2 and is attached to the bearing portion 13 in an inclined posture that descends toward the front side in the rotational direction. Yes.
[0035]
The middle impeller 15 on the upper stage is provided with three middle blade portions 17 extending in a direction orthogonal to the axial direction around a bearing portion 16 that is similarly fitted to the vertical rotation shaft 11 so as to be inserted and removed from the upper direction at intervals of 120 degrees. It has a different shape. The middle blade portion 17 is formed in a plate shape that is approximately half the length of the large blade portion 14, and is attached to the bearing portion 16 in an inclined posture that descends toward the rear side in the rotational direction.
[0036]
Both impellers 12 and 15 are attached to the longitudinal rotation shaft 11 so that the large blade portion 14 and the middle blade portion 17 are staggered when viewed from above (see FIG. 2). The vertical rotation shaft 11 is connected to a motor 18 provided below the container 2, and both impellers 12 and 15 are driven to rotate around the vertical rotation shaft 11 by the driving force of the motor 18. It has become.
[0037]
A pair of choppers 20 </ b> A and 20 </ b> B (corresponding to the horizontal axis stirring member of the present invention) are provided on the inner peripheral surface 4 of the container 2 at intervals of 180 degrees. The choppers 20 </ b> A and 20 </ b> B have a structure in which three sets of small impellers 23 are attached to a lateral rotation shaft 21 protruding in a horizontal direction from the inner peripheral surface 4 of the container 2 with an interval in the axial direction. The small impeller 23 is provided with four small blade portions 22 extending in the direction orthogonal to the axial direction at intervals of 90 degrees.
Further, the horizontal rotation shaft 21 of the choppers 20 </ b> A and 20 </ b> B is connected to a motor 24 provided on the side of the container 2, and the small impeller 23 rotates around the horizontal rotation shaft 21 by the driving force of the motor 24. It is designed to be driven.
[0038]
The pair of choppers 20A and 20B are provided at positions shifted vertically from each other. That is, the first chopper 20A is provided at a position slightly above the center in the vertical direction of the container 2, and the second chopper 20B is provided at a substantially intermediate position between the first chopper 20A and the agitator 10. It has been.
[0039]
A cylindrical discharge cylinder 5 communicating with the inside of the container 2 is provided on the outer peripheral surface of the container 2, from which the mixture 44 can be discharged to the outside of the container 2.
[0040]
On the upper surface side of the container 2, a top plate portion 30 formed in a substantially disc shape capable of tightly closing the opening on the upper surface of the container 2 is mounted so as to be freely opened and closed (see FIGS. 1 and 3). ). The top plate portion 30 is provided with inlets 31 and 32 for introducing the main raw material and the auxiliary raw material into the container 2 and a water spout 34 for supplying the water 43 into the container 2.
[0041]
The main raw material inlet 31 is formed in a cylindrical shape by raising the opening edge of the circular opening to a wall shape. The auxiliary material charging port 32 is attached to an opening formed in a substantially rectangular shape that is slightly larger than the main material charging port 31, and a lid portion 33 that can close the opening is attached to the opening through a hinge portion. It is what was done.
[0042]
The water spout 34 is formed in a cylindrical shape having a slightly smaller diameter than the main raw material inlet 31 at a position on the rear side in the rotational direction of the agitator 10 with respect to the first chopper 20A. A hose 37 for supplying water 43 is connected to the upper opening of the sprinkling port 34, and a watering nozzle 35 for spraying the water 43 supplied from the hose 37 is attached to the lower opening. ing. The watering nozzle 35 is formed in a substantially bell-like shape, and its lower side surface is a substantially elliptical fountain surface 36 whose major axis is the radial direction of the container 2. Not shown) has been established. In addition, a cylindrical connecting portion (not shown) is extended from the top position of the bell in the watering nozzle 35, and the connecting portion is closely fitted inside the watering port 34, whereby the watering nozzle 35. Is attached to the water spout 34. At this time, the water spray nozzle 35 is in a posture in which the fountain surface 36 is slightly inclined upward toward the center direction of the container 2, and a belt-like shape extending from the peripheral portion to the center position along the radial direction of the container 2. It is possible to spray the water 43 on the watering region R.
[0043]
Next, the process of manufacturing the mixture 44 by the stirring device 1 configured as described above will be described.
[0044]
The main raw material used for the production of the mixture 44 of the present embodiment is a lightweight cellular concrete granule 40 (corresponding to the main raw material of the present invention, which is obtained by pulverizing lightweight cellular concrete to have an average particle diameter of 10 to 200 μm. It is referred to as a granular material 40). Since this granular material 40 is porous and may adsorb a small amount of moisture, the moisture content is measured in advance in order to determine the amount of water 43 to be added in the mixing step.
[0045]
Then, while rotating the agitator 10 of the stirring device 1, the granular material 40 is poured into the container 2 from the main raw material inlet 31, and the granular material 40 is uniformly distributed in the entire container 2 (FIG. 4). . The granular material 40 is thrown in until the upper end reaches the center position in the length direction of the small blade portion 22 of the first chopper 20 </ b> A that is located above the horizontal rotation shaft 21. At this time, when the agitator 10 is rotated at a high speed, the moisture contained in the granular material 40 becomes water vapor due to the generated heat, and the fibers 41 are not easily defibrated in the subsequent mixing step. For this reason, it is preferable to set the rotational speed of the agitator 10 to a low speed of 5 to 20 rpm. Moreover, in order to prevent a temperature rise, stirring may be performed while cooling the container 2.
[0046]
Next, the rotation of the agitator 10 is stopped once, and the fiber 41 (corresponding to the auxiliary material of the present invention) is input from the auxiliary material input port 32. Then, the rotation of the agitator 10 is restarted, the rotation speed is increased to 111 rpm, and the choppers 20A and 20B are rotated at a rotation speed of 3,000 rpm to disperse the fibers 41 in the powder particles 40 (FIG. 5). At this stage, since the water 43 is not added, the granular material 40 is further dried in a relatively dry state, and the fibers 41 do not converge and become spoiled due to moisture. For this reason, mixing is performed smoothly.
[0047]
In this mixing step, the tip portion 22A of the small blade portion 22 of the first chopper 20A is exposed to the upper surface 40A of the granular material 40 when it is rotated to the upper side with respect to the horizontal rotation shaft 21. Then, when the small blade portion 22 is further rotated and the tip portion 22 </ b> A enters the granular material 40, the fibers 41 existing on the upper surface of the granular material 40 are pushed into the granular material 40. Then, the pushed fibers 41 are diffused in the lateral direction on the rotational flow by the agitator 10.
[0048]
Here, the chopper 20 </ b> A is rotated in the forward direction with respect to the rotation direction of the agitator 10. That is, when the small blade portion 22 of the chopper 20A is rotated to the lower side of the horizontal rotation shaft 21 and approaches the agitator 10, the feeding direction is rotated in a direction that coincides with the rotation direction of the agitator 10. In other words, the agitator 10 is rotated counterclockwise when viewed from the motor 18 side, whereas the choppers 20A and 20B are rotated clockwise when viewed from the motor 24 side (in the direction of the arrow in FIG. 5). In this way, the vertical rotational flow generated by the rotation of the chopper 20A merges with the horizontal rotational flow generated by the rotation of the agitator 10 at the lower position of the horizontal rotation shaft 21. Thereby, the spreading | diffusion of the fiber 41 is performed smoothly.
[0049]
Next, the fiber 41 carried to the vicinity of the second chopper 20B by the rotating flow of the agitator 10 is further carried downward along with the vertical rotation of the second chopper 20B. The fibers 41 conveyed downward are further diffused in the lateral direction by the rotational flow by the agitator 10. At this time, as in the case of the first chopper 20 </ b> A described above, the rotation direction of the second chopper 20 </ b> B is the forward direction with respect to the rotation direction of the agitator 10. For this reason, the diffusion of the fibers 41 is performed smoothly. In this way, the fibers 41 are diffused throughout the granular material 40.
[0050]
Furthermore, the large impeller 12 on the lower stage side of the agitator 10 is attached to the bearing portion 13 in a posture in which the front side in the rotational direction is slightly inclined downward, and creates a rotational flow that rises obliquely upward. On the other hand, the upper middle impeller 15 is attached to the bearing portion 16 in such a posture that the rear side in the rotational direction is slightly inclined downward, and creates a rotational flow of suction downward obliquely. By these, a convection is produced in the whole granular material 40, and the fiber 41 can be spread | diffused uniformly. In this way, a mixed raw material 42 in which the powder particles 40 and the fibers 41 are mixed is prepared (FIG. 6).
[0051]
Next, stirring is further performed while spraying a predetermined amount of water 43 from the watering nozzle 35 onto the upper surface of the mixed raw material 42 (FIG. 7). The amount of water 43 added is determined by subtracting the water content of the granular material 40 measured in advance, and is adjusted so that the water content of the mixture 44 after the addition is about 35 ± 5% by weight.
[0052]
Furthermore, in order to prevent the occurrence of debris, it is preferable to start watering after the fibers 41 are sufficiently defibrated and sufficiently diffused into the powder particles 40. However, if the timing of the start of sprinkling is too late, water vapor is generated by the heat generated during mixing, and the fibers 41 that have been defibrated once by this water vapor are converged again, making it easy to produce spoilage. For this reason, it is preferable that watering is started immediately before the generation of water vapor. Specifically, it is preferably started immediately before the temperature in the container 2 becomes 40 ° C. or higher, or immediately before the temperature difference between the inside of the container 2 and the outside air becomes 20 ° C. or higher.
[0053]
The water 43 ejected from the watering nozzle 35 is sprayed on the watering region R extending from the peripheral edge to the center along the radial direction of the container 2 on the rear side in the rotational direction of the agitator 10 with respect to the first chopper 20A. Is done. And the granular material 40 of the sprinkling area | region R which got water | moisture content with the sprayed water 43 is spread | diffused below on the rotational flow by the choppers 20A and 20B similarly to the case of the above-mentioned fiber 41, and the agitator 10 It spreads in the lateral direction on the rotating flow. Thereby, the water 43 is uniformly diffused throughout the mixed raw material 42.
[0054]
At this time, by setting the sprinkling region R to the rear side in the rotation direction of the agitator 10 with respect to the first chopper 20A, the mixed raw material 42 with moisture can be quickly diffused downward, and the mixed raw material of the water 43 The diffusion to 42 can be performed quickly. Further, the water spray region R is a range extending from the peripheral portion to the center position along the radial direction of the container 2. Thereby, since the water 43 sprinkled with rotation of the agitator 10 is diffused concentrically, the water 43 can be uniformly mixed in the entire mixed raw material 42.
[0055]
In this way, a mixture 44 in which the powder particles 40, the fibers 41, and the water 43 are uniformly mixed is manufactured. The manufactured mixture 44 is discharged from the discharge tube 5 of the container 2 and is carried to the next press molding process.
[0056]
In the press molding step, for example, the mixture 44 is poured into a mold of a pressure molding machine such as a uniaxial press machine, and is molded at a pressure of 10 to 30 MPa by pressing.
[0057]
Subsequently, the obtained press-molded body is taken out from the press-molding machine and brought into contact with carbon dioxide gas or carbon dioxide-containing gas in a curing pot to cause a carbonation reaction to be cured. The carbonation reaction uses, for example, commercially available liquid carbon dioxide, dry ice, combustion gas, exhaust gas or the like as carbon dioxide or carbon dioxide-containing gas, and the carbon dioxide concentration is 3 to 100%, preferably 30 to 100%, and the pressure is The temperature is 0.1 to 0.8 MPa, and the temperature is 0 ° C. or more and saturation temperature or less, preferably room temperature to saturation temperature minus 20 ° C. Then, the said carbonic acid hardening molded object is dried as needed.
[0058]
In this manner, a carbonated cured molded article having excellent moisture absorption and desorption properties, in which carbonation is uniformly formed to the inside, bending strength is good, and cracks and cracks are not observed, is completed.
[0059]
The technical scope of the present invention is not limited by the above-described embodiments, and, for example, those described below are also included in the technical scope of the present invention. In addition, the technical scope of the present invention extends to an equivalent range.
(1) According to the present embodiment, the agitator 10 is provided with the large impeller 12 and the medium impeller 15, but according to the present invention, the configuration of the first stirring member is not limited to the present embodiment. For example, only one type of impeller may be provided.
(2) According to the present embodiment, the impellers 12 and 15 included in the agitator 10 include the three blade portions 14 and 17, respectively. According to the present invention, the blades included in the first stirring member. The number of copies is not limited to this embodiment, and may be two, or four or more.
(3) According to the present embodiment, each of the choppers 20A and 20B includes three sets of small impellers 23 each including four small blade portions 22, but according to the present invention, the second stirring member The number of blades may be 3 or less, or 5 or more, depending on the properties of the raw materials or the amount of auxiliary materials added. Further, the number of impellers 23 is not limited to the present embodiment, and may be two sets or less, or four sets or more.
(4) According to the present embodiment, the choppers 20A and 20B are provided at positions shifted vertically from each other, but according to the present invention, the position of the second stirring blade is not limited to the present embodiment. It may be provided at the same height.
(5) According to the present embodiment, the fiber 41 is used as the auxiliary material, but according to the present invention, the type of the auxiliary material is not limited to this embodiment, and for example, a pigment or the like may be used. Further, fibers and pigments may be mixed and used. Even in such a case, uniform mixing with the main raw material can be performed by the same method as in the present embodiment.
(6) According to the present embodiment, the fibers 41 are put into the container 2 in the dry state from the auxiliary raw material inlet 32 and mixed. However, according to the present invention, the auxiliary raw material mixing method is the present exemplary embodiment. For example, the auxiliary material previously dispersed in water may be added and mixed.
[Brief description of the drawings]
FIG. 1 is a side sectional view of a stirring device according to an embodiment of the present invention.
FIG. 2 is a top view of the stirring device of the present embodiment.
FIG. 3 is a top view of a stirring device with a top plate attached.
FIG. 4 is a side cross-sectional view showing a state in which a granular material is put into a stirring device.
FIG. 5 is a side sectional view showing a state in which fibers are put into a stirring device.
FIG. 6 is a side cross-sectional view showing a state in which a powder and a fiber are mixed.
FIG. 7 is a side sectional view showing a state where water is sprayed on a mixed raw material.
[Explanation of symbols]
1 ... Agitator
2 ... Container
10 ... Agitator (vertical axis stirring member)
11 ... Vertical rotation axis
20A, 20B ... Chopper (horizontal axis stirring member)
21 ... Horizontal axis of rotation
22 ... Small feather part (feather part)
22A ... tip
35 ... Watering nozzle (watering member)
40 ... granular material (main raw material)
41 ... Fiber (subsidiary raw material)
42 ... Mixed raw materials
43 ... water
44 ... Mixture
R ... Watering area

Claims (5)

A stirrer for producing a mixture containing a powdery main raw material, one or more auxiliary raw materials, and water ,
A container capable of containing the mixture;
A vertical axis stirring member provided at the bottom of the container and rotatable about a vertical rotation axis in the vertical direction;
And a horizontal axis stirring member rotatable about a horizontal rotational shaft disposed toward the direction intersecting with the longitudinal rotation axis above said longitudinal axis agitator,
The horizontal axis agitating member is provided at a position where a pair is displaced in the vertical direction. The rotation direction of the horizontal axis stirring member is a forward direction that moves in the same direction as the rotation direction of the vertical axis stirring member when a blade portion provided on the horizontal axis stirring member approaches the vertical axis stirring member. The stirring device according to claim 1 . The said container, to claim 1 or claim 2, characterized in that is provided with a sprayable watering member the water in the rotation direction rear position of the longitudinal axis agitator with respect to the horizontal axis agitator The stirrer described. The sprinkling member, according to claim 3, characterized in that the rotational center is capable spraying said water sprinkling area over the periphery of the container together along a radial direction of said longitudinal axis agitator Stirring device. A mixture containing a powdery main raw material, one or more auxiliary raw materials, and water, and the proportion of the auxiliary raw material is 10% or less with respect to the sum of the dry weight of the main raw material and the auxiliary raw material A method of manufacturing using the stirring device according to any one of claims 1 to 4,
(a) While rotating the vertical axis stirring member, the length of the main raw material when the upper end of the blade is provided on the horizontal axis stirring member is located above the horizontal rotation axis Throwing into the container until a central position in the direction is reached;
(b) introducing the auxiliary material into the container;
(c) rotating the vertical axis stirring member and the horizontal axis stirring member to mix the main raw material and the auxiliary raw material to prepare a mixed raw material;
(d) sprinkling the water from the water sprinkling member while rotating the vertical axis stirring member and the horizontal axis stirring member, and performing the step of mixing the mixed raw material and water. Production method.

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