JP2006130450A - Mixing apparatus for powder and liquid - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a suspension/dissolution (mixing) apparatus of a powder (especially particulate powder) and a liquid which has a simple structure and an enhanced mixing ability (efficiency) between the powder and the liquid. <P>SOLUTION: A mixing unit of the powder and the liquid is equipped with a powder inflow port 6 having a bottom face 2 on an approximately curved face and in which the powder flows or falls, a mother pipe having a mixture derivation port 7 from which the mixture of the powder and the liquid is derived, a branched pipe 4 which becomes the passage of the liquid penetrated to or connected with the mother pipe so that it communicates with the outer periphery of the mother pipe, and a liquid discharging port 3 to discharge the liquid facially towards the inside of the mother pipe so that the liquid constitutes the facially contact face, which is arranged at the end of the mother pipe side of the branched pipe. Additionally, the mixing apparatus for continuously manufacturing a solution or slurry by mixing the powder and the liquid on in-line using the unit, and the manufacturing process of the mixture of the liquid are provided. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a powder and liquid mixing unit, and more specifically, a tube (solid-liquid contact tube) for bringing the powder and liquid into contact with and mixing the powder and liquid, and in some cases, a powder outlet. (The joint between the solid-liquid contact tube and the device for supplying (inflowing or dropping) the powder) The blockage of the powder and liquid that can be mixed by eliminating or blocking with a very high probability Concerning the mixing unit.

  In addition, the present invention can mix powder and liquid in-line using such a powder and liquid mixing unit, and can further mix a powder and liquid (solution or slurry) of a desired concentration. ), A tube for contacting and mixing powder and liquid (solid-liquid contact tube), and in some cases, a powder outlet (solid-liquid contact tube and a joint between the device for transferring powder) ), Or a powder and liquid mixing apparatus that can be continuously manufactured with a very high probability, and a method for manufacturing a powder and liquid mixture.

  In particular, even when it is desired to produce a solution or slurry having a high concentration and / or high viscosity, the solution or slurry having a target concentration is introduced into a solid-liquid contact tube, and in some cases, a powder. The present invention relates to a powder and liquid mixing device that can eliminate or block clogging at an outlet or suppress it with a very high probability, and a method for manufacturing a powder and liquid mixture.

  When powder and liquid are mixed to prepare a powder and liquid mixture, that is, a solution or slurry, the powder is transferred to a storage tank in which a liquid for mixing (suspending or dissolving) the powder is stored, Pour into the liquid and mix. However, since it is difficult to transfer the powder continuously at a constant flow rate, batch operation is common. First, a predetermined amount of powder is transported (transferred), and then in a mixing tank. The solution or slurry must be prepared by mixing with a predetermined amount of liquid, the size of the device becomes larger than the preparation amount of the solution or slurry for the batch type device, and the powder in the batch type device Is likely to rise from the liquid surface during stirring and mixing and scatter to the surroundings, and the powder and liquid are joined (contacted) and mixed into the mixed liquid (merging part). Accumulation or stagnation of the mixture of powder and liquid due to the adhesion of the powder causes the piping, particularly the solid-liquid contact tube, which is a tube for mixing the powder and liquid, to gradually close, finally Various problems such as complete occlusion There was a point.

  On the other hand, many proposals have been made to solve the above problems (see, for example, Patent Document 1).

  For example, a uniaxial eccentric pump for powder that transfers powder in a gas-solid mixed phase flow and a liquid that suspends and / or dissolves powder as a driving fluid, and is transferred from the uniaxial eccentric pump for powder via a transfer pipe. Continuously and quantitatively measured by a powder suspension / dissolution device equipped with an ejector that sucks the gas-solid mixed phase flow, a mixing means provided downstream of the ejector, and a separating means provided downstream of the mixing means In particular, there is a report that powder can be suspended and dissolved in a liquid (see Patent Document 1). However, in the suspension / dissolution apparatus that has been reported, the powder is scattered during the stirring and mixing of the powder and the liquid, and the batch (batch) operation must be performed in the mixing of the powder and the liquid. Although the problem that the apparatus is enlarged compared to the amount of solution or slurry prepared has been improved, it is blocked by accumulation or stagnation of the mixture of powder and liquid in the above-mentioned piping (particularly solid-liquid contact tube). There is no improvement in doing. Furthermore, the problem caused by using an ejector, that is, the gas and the powder are mixed with the liquid as a multiphase flow without being separated, and the powder and the liquid are brought into contact in the mixing process (powder and air are mixed together). It is necessary to provide gas (air) separation means, the device becomes somewhat complicated, the pressure in the ejector is likely to fluctuate, the flow rate is difficult to control, and the pressure balance in the ejector is broken immediately. There was a problem that piping and the like were clogged and that the nozzle of the powder suction portion of the ejector was easily clogged. When an ejector is used, for example, when ordinary Portland cement powder and water are mixed, the flow rate of ordinary Portland cement powder when the water flow rate is 1000 kg / H is a maximum of 200 kg / H (after mixing). And the concentration of the suspension or solution after mixing cannot be adjusted to a high concentration because the powder flow rate cannot be increased relative to the liquid flow rate. It was. Furthermore, with this apparatus, it is difficult to produce a highly viscous slurry, and when mixing fine powder such as silica (for example, Aerosil) with an appropriate liquid, the liquid level is high. There is also a problem that the powder floats and cannot be mixed sufficiently.

  As a device for mixing fine powder (fine powder) and an appropriate liquid, it is connected to the fine powder storage tank and the lower end discharge port of the storage tank, and a small amount of air is introduced to quantitatively transfer the fine powder. A uniaxial eccentric screw pump, a discharge pipe having a proximal end connected to a discharge port of the pump via a fine powder supply pipe, a tip having a trumpet opening, and a stirring blade that stores liquid and rotates at a constant speed. There has been proposed a fine powder dissolution apparatus including a deployed dissolution tank (see Patent Document 2). However, in this apparatus, since the concentration of the suspension or solution after mixing cannot be adjusted to a high concentration, further improvement is required.

  Furthermore, one end of the transfer pipe is connected to the powder discharge port (outlet port) on the stator tip side of the uniaxial eccentric screw pump for powder transfer, and one end of the flexible wire can be rotated integrally with the rotor tip over almost the entire length of the pipe. It is reported that when a flexible wire is grounded via a pump casing or a rotor drive device, powder is prevented from adhering to and clogging in the powder transfer pipe (patent) Reference 3). According to this device, blockage of the powder discharge port of the uniaxial eccentric screw pump for powder transfer is prevented, but further improvement is required for suppression of blockage in the solid-liquid contact portion (solid-liquid contact tube).

  Under such circumstances, the device is not a batch-type device, the device is not complicated, the pressure in the tube is difficult to fluctuate, the flow rate of the powder and liquid is easy to control, and the powder and liquid are contacted and mixed. Eliminate the blockage in the tube (solid-liquid contact tube), and in some cases further the powder outlet (joint between the solid-liquid contact tube and the device for transferring the powder), or with a very high probability Even if it is desired to suppress and further select a fine particle powder such as silica as a powder or to prepare a highly concentrated and / or highly viscous solution or slurry (suspension) It is desired to develop a dissolution / suspension (mixing) apparatus capable of preparing a solution or a slurry.

Japanese Patent No. 3356957 JP-A-9-276684 JP 2001-151346 A

  Therefore, the problem to be solved by the present invention is a powder (especially fine particle powder) having a simple structure and improved mixing performance (efficiency) of powder and liquid as compared with the prior art. The object is to provide a liquid suspension / dissolution (mixing) device or the like.

  In the present invention, a specific powder and liquid mixing unit is used. This specific powder and liquid mixing unit has a bottom surface on a substantially curved surface as a solid-liquid contact tube, a powder inlet through which powder flows in or drops, and a mixture of powder and liquid is derived. A branch pipe serving as a liquid flow path penetrating through or connected to the outer periphery of the mother pipe, and an end of the branch pipe on the mother pipe side. A liquid discharge port that discharges the liquid in a plane toward the inside of the mother pipe (to form a plane discharge flow) so as to form a plane contact surface with the powder, which is disposed in the section With.

That is, in the first aspect of the present invention, it has a substantially curved bottom surface, and has a powder inlet through which powder flows in or drops, and a mixture outlet through which a mixture of powder and liquid is derived. Mother tube,
A branch pipe serving as a liquid flow path penetrating or connected to communicate with the outer periphery of the mother pipe;
The liquid is disposed in a plane (planar discharge flow) toward the inside of the mother pipe so as to form a planar contact surface with the powder, which is disposed at an end of the branch pipe on the mother pipe side. A powder and liquid mixing unit (hereinafter, also referred to as “powder and liquid mixing unit of the present invention”) having a feature of including a liquid discharge port for discharging. .

  In the powder and liquid mixing unit of the present invention, both the mother pipe and the branch pipe can be circular pipes, and at this time, the mother pipe has an elbow shape obtained by bending the circular pipe at a predetermined angle, The branch pipe may be penetrated or connected in the vicinity of the mother pipe having an elbow shape (for example, between the shoulder portion and the upstream end portion). The liquid discharge port may be a liquid discharge port that discharges a liquid in a planar shape to form a planar discharge flow, or a liquid discharge port (for example, discharge in a linear or rod shape). Etc.) may be combined to form a planar discharge flow.

  Furthermore, in the powder and liquid mixing unit of the present invention, the planar discharge flow (flow of liquid discharged in a planar shape) constituting the planar contact surface is obliquely intersected with the inflow or fall direction of the powder. As described above, a film or laminar discharge flow that expands in a fan-like manner in a direction inclined by a predetermined angle toward the inflow or fall direction of the powder and also extends in a direction perpendicular to the direction inclined by the angle. Preferably it is formed.

  In the powder and liquid mixing unit of the present invention, the disposition position of the powder inlet is preferably a sheet discharge flow (liquid discharged in a sheet form) at the upstream end of the mother pipe. The position where the liquid is dispersed and stably flowed in or dropped (introduced) is selected.

  The powder and liquid mixing unit of the present invention can be provided with a vertical uniaxial eccentric screw pump for transferring powder, which will be described later. It is possible to provide a powder adhesion preventing member that scrapes off the powder adhered at the body outlet (the powder inlet of the mother pipe). As a result, the powder adhering to the powder outlet of the vertical uniaxial eccentric screw pump for powder transfer can be scraped off, and moisture can be prevented from adhering. There is no adhesion of powder at the powder outlet of the vertical uniaxial eccentric screw pump, or it is suppressed with a very high probability. As a result, blockage of the powder outlet can be eliminated or suppressed with a very high probability. In addition, about the said powder adhesion prevention member, it can consist of one or several rotors which rotate using the rotation of the rotor of the vertical uniaxial eccentric screw pump for the said powder transfer.

  The powder and liquid mixing unit of the present invention can be used for a powder and liquid mixing apparatus for mixing powder and liquid in-line and continuously producing a solution or slurry.

In a second aspect of the present invention, there is provided a powder and liquid mixing apparatus for mixing powder and liquid in-line to continuously produce a powder and liquid mixture,
Comprising the unit described above, ie the powder and liquid mixing unit of the invention,
A vertical uniaxial eccentric screw pump for powder transfer for quantitative transfer of the powder is provided on the upstream side of the mother pipe of the unit,
A powder and liquid mixing device (hereinafter referred to as “powder and liquid mixing device of the present invention”) characterized in that a liquid transfer metering pump for metering and transporting the liquid is provided on the upstream side of the branch pipe of the unit. Also referred to as).

  In the powder and liquid mixing apparatus of the present invention, preferably, the powder is dispersed in the liquid with a high dispersion force using a shearing force at the downstream end of the mother pipe of the unit. Of high dispersion mixing equipment. Further, in this case, more preferably, further provided with a metering pump for transferring the mixture or the dispersion for further transferring the mixture or dispersion of the powder and the liquid, on the downstream side of the high dispersion mixing device. Furthermore, a return device is provided for returning a solution or slurry obtained by mixing and dispersing the powder and the liquid with the high dispersion mixing device to a storage tank for storing the liquid. This makes it possible to prepare a higher-concentration slurry or solution in which the powder is uniformly dispersed.

  In the powder and liquid mixing apparatus of the present invention, a mixture homogenizing apparatus for further uniformly mixing the powder and liquid mixture can be provided downstream of the high dispersion mixing apparatus. Thereby, the powder and the liquid can be mixed more uniformly in-line.

  In the powder and liquid mixing apparatus of the present invention, the vertical uniaxial eccentric screw pump for transferring powder is provided with a powder adhesion preventing member that scrapes off the powder adhering to the powder outlet. Can do. As a result, the powder adhering to the powder outlet of the vertical uniaxial eccentric screw pump for transferring powder can be scraped off, and moisture can be prevented from adhering. There is no adhesion of powder at the powder outlet of the vertical uniaxial eccentric screw pump for transfer, or it is suppressed with a very high probability. As a result, blockage of the powder outlet can be eliminated or suppressed with a very high probability. In addition, about the said powder adhesion prevention member, it can consist of one or several rotors which rotate using the rotation of the rotor of the vertical uniaxial eccentric screw pump for the said powder transfer.

  The powder and liquid mixing apparatus according to the present invention further includes a pipe, a pipe (particularly a branch pipe) serving as the liquid flow path, and a pipe serving as the flow path for the powder and liquid mixture. A cleaning device can be provided. By providing this cleaning device, the powder, slurry, etc. adhering to the pipes, particularly the pipes (especially the branch pipes) that serve as the flow paths of the liquid and the pipes that serve as the flow paths of the powder and liquid mixture are completely inline Can be removed.

In a third aspect of the present invention, in a method for producing a mixture of powder and liquid,
Including a step of bringing the powder that flows in or drops into contact with the liquid that is ejected in a planar manner (to form a planar ejection flow) so as to form a planar contact surface between the powder and the powder. And a method for producing a mixture of powder and liquid (hereinafter also referred to as “a method for producing a mixture of powder and liquid of the present invention”).

  In the method for producing a mixture of powder and liquid according to the present invention, the liquid is discharged so as to constitute the planar contact surface. It is possible to form a film or a layered discharge flow that expands in a fan-like manner in a direction inclined by a predetermined angle toward the inflow or fall direction, and also extends in a direction perpendicular to the direction inclined by the angle. .

  In the method for producing a mixture of powder and liquid according to the present invention, the powder is dispersed on the surface-discharged liquid (planar discharge flow) and stably flows in or drops ( Introduction).

According to a fourth aspect of the present invention, there is provided a method for producing a mixture of powder and liquid, wherein the powder and liquid are mixed in-line to continuously produce a mixture of powder and liquid, comprising the following steps: A method for producing a powder and liquid mixture having characteristics (hereinafter, also referred to as “in-line production method of a powder and liquid mixture of the present invention”) can be provided:
a. A step of allowing a powder to flow in or drop from a powder storage tank by a vertical uniaxial eccentric screw pump for transferring powder;
b. Discharging the liquid in a fixed amount so as to form a surface contact surface with the powder (to form a surface discharge flow); c. The step of bringing the powder that flows in or drops into contact with the liquid that is discharged in a planar shape so as to form a planar contact surface between the powder and the powder.

  In the in-line method for producing a mixture of powder and liquid according to the present invention, the liquid is discharged so as to constitute the planar contact surface so as to obliquely intersect the inflow or fall direction of the powder. In order to form a film or laminar discharge flow that expands in a fan-like manner in a direction inclined by a predetermined angle toward the inflow or fall direction of the powder and also extends in a direction perpendicular to the direction inclined by the angle. It can be carried out.

  In the in-line method for producing a mixture of powder and liquid according to the present invention, the powder is dispersed on the surface-discharged liquid (planar discharge flow) and stably flows or drops. (Introduction) is preferable.

In the in-line production method of the powder and liquid mixture of the present invention,
d. The powder and the liquid obtained by bringing the powder and the liquid into contact in the step c are dispersed in the liquid with a high dispersion force using a shearing force. Process, if necessary,
e. A step of returning the dispersion of the powder and the liquid obtained by dispersing the powder to the liquid in the step d to a storage tank storing the liquid can be included.

In the in-line production method of the powder and liquid mixture of the present invention,
f. A step of mixing the powder and the liquid obtained by bringing the powder and the liquid into contact with each other so as to be more uniform can be included.

  In the in-line method for producing a mixture of powder and liquid according to the present invention, the mixture of the powder and the liquid is further mixed by a stationary pipe stirrer. Can do.

  The method for producing an in-line mixture of powder and liquid according to the present invention further includes powder adhesion by scraping the adhered powder at the powder outlet of the vertical uniaxial eccentric screw pump for powder transfer. A prevention step can be included. In addition, about the said powder adhesion prevention process, it can carry out by rotation of the 1 or several rotor rotated using the rotation of the rotor of the vertical uniaxial eccentric screw pump for the said powder transfer, for example.

  The method for producing an in-line mixture of a powder and a liquid according to the present invention further includes a step of washing the pipe, the tube that becomes the flow path of the liquid, and the tube that becomes the flow path of the mixture of the powder and liquid. be able to. By adding this cleaning step, the powder, slurry, etc. adhering to the piping, particularly the tube that becomes the flow path of the liquid and the tube that becomes the flow path of the powder and liquid mixture, are completely removed in-line. Can do.

  According to the present invention, a specific powder and liquid mixing unit with a simple structure and improved mixing performance (efficiency) of powder and liquid, more specifically, a tube in which the powder and liquid are in contact (mixed) Solid-liquid contact tubes, which in the present invention are not clogged or reduced (reduced) with a high probability, i.e., solid and liquid contact tubes are boring or difficult Provided is a specific powder and liquid mixing unit capable of easily preparing (manufacturing) a mixture, that is, a solution or slurry, particularly a highly concentrated and / or highly viscous solution or slurry.

  In addition, there is provided a powder and liquid mixing apparatus capable of producing a continuously stable solution or slurry, in particular, a highly concentrated and / or highly viscous solution or slurry using the mixing unit described above. . This powder and liquid mixing device (powder and liquid mixing device of the present invention) has a simple structure and high mixing performance (efficiency) between powder and liquid. Specifically, the apparatus is not complicated, the pressure in the tube is difficult to fluctuate, the flow rate of the powder and liquid is easy to control, and the solid-liquid contact is a tube in which the powder and liquid are in contact (mixed). Tube, in the present invention the powder outlet of the mother tube or the device for transferring powder (vertical uniaxial eccentric screw pump for transferring powder) is not clogged, that is, difficult (no blockage or extremely Highly deterred). Therefore, the powder and liquid can be mixed continuously (in-line) easily and in a state where the solid-liquid contact tube or the like is not boring or difficult. Moreover, it is possible to prepare a solution or slurry having a higher concentration by dispersing the powder in the liquid with a high dispersion force. In particular, even when a solution or slurry is produced by mixing fine particle powder and liquid, or when a highly viscous solution or slurry is produced by mixing powder and liquid, The slurry can be produced continuously (in-line), simply, in a state where the solid-liquid contact tube or the like is not boring or difficult. According to the present invention, it is also possible to provide a method for producing a mixture of powder and liquid in which powder and liquid are mixed (dissolved or suspended) in-line to continuously produce a solution or slurry.

  Furthermore, a high-concentration and / or high-viscosity solution or slurry can be continuously and easily produced using the powder and liquid mixing apparatus or the method for producing the powder and liquid mixture. it can. Therefore, the present invention is extremely useful industrially.

Hereinafter, the best mode for carrying out the present invention will be described in detail with reference to the drawings.
In the present invention, a powder and liquid mixing unit, powder and liquid are mixed in-line (powder is dissolved or suspended in-line), and a mixture of powder and liquid (solution or slurry) is continuously added. For example, a powder and liquid mixing apparatus for producing a solution), a solution or slurry production method for continuously producing a solution or slurry by mixing (dissolving or suspending) the powder and liquid in-line, and the like. The powder and liquid mixing unit of the present invention and the powder and liquid mixing apparatus of the present invention will be described in detail with reference to FIGS. 1 to 9 and FIG. 13, but the present invention is not limited thereto. It is not something.

(Powder and liquid mixing unit of the present invention)
In the powder and liquid mixing unit according to the present invention, the powder and liquid are brought into contact with and mixed with the powder and liquid (solid-liquid contact tube, mother tube in the present invention), and for powder transfer. In this device (a vertical uniaxial eccentric screw pump for powder transfer), the powder outlet port is not clogged or is suppressed with a very high probability, and can be mixed easily. This is especially true when mixing fine particle powder and liquid, or when mixing powder and liquid that are a mixture (solution or slurry) of high-concentration and / or high-viscosity powder and liquid. Since powder and liquid do not cause clogging in solid-liquid contact tubes or the like, or can be easily mixed while being suppressed with a very high probability, it can be used for mixing fine particles of powder and liquid or high It is extremely excellent as a powder and liquid mixing unit for producing viscous solutions or slurries.

  FIG. 1 is a diagram showing a schematic configuration of a powder and liquid mixing unit according to one embodiment of the present invention. Referring to FIG. 1, the mixing unit includes a mother pipe 2 that serves as a flow path for powder, liquid, and a mixture thereof, and a liquid flow path that is provided to communicate with the outer periphery of the mother pipe. A solid-liquid contact tube comprising the branch tube 4 is provided. The mother pipe 2 is a circular pipe, and has an elbow shape obtained by bending the pipe. The mother pipe 2 has a powder inlet 6 through which powder flows in or drops, and a mixture outlet 7 through which a mixture of powder and liquid is derived. On the other hand, the branch pipe 4 is a circular pipe, and penetrates or is connected in the vicinity of the elbow-shaped mother pipe 2, specifically, between the shoulder portion and the upstream end portion thereof. Further, at the end of the branch pipe 4 on the side of the mother pipe 2, the liquid is formed into a planar shape (planar discharge flow) toward the inside of the mother pipe 2 so as to form a planar contact surface with the powder. A liquid discharge port 3 that can be discharged is provided. In the solid-liquid contact tube, on the upstream side of the mother tube 2, a vertical uniaxial eccentric screw pump 1 for transferring powder for quantitatively transferring powder is provided. The uniaxial eccentric screw pump 1 is connected via a lid 5 so that powder does not scatter from the inside of the mother pipe to the outside thereof. Further, although not shown, a liquid transfer metering pump for quantitatively transporting the liquid is disposed at the upstream end of the branch pipe 4, and the liquid is discharged by the liquid transporting metering pump. It is supplied to the outlet 3 and discharged from the liquid discharge port 3. Although not shown, the lid 5 is usually provided with an exhaust port for pressure balance. The exhaust port is usually provided with a filter.

  The solid-liquid contact tube used in the powder and liquid mixing unit of the present invention is not provided so as to communicate with the outer periphery of the mother tube serving as a flow path for the powder, liquid, and a mixture thereof, and the outer periphery of the mother tube. It can consist of the branch pipe used as the flow path of the connected liquid.

  The mother pipe has a bottom surface on a substantially curved surface from the viewpoint of removing powder adhering to the inner wall of the mother pipe, a powder inlet through which powder flows in or drops, powder and What is necessary is just to have a mixture outlet through which the liquid mixture is derived. For example, a circular pipe can be selected as the mother pipe, and the elbow can be bent by a predetermined angle, for example, about 90 °.

  There is no restriction | limiting in particular about the said branch pipe. For example, a circular pipe can be selected as the branch pipe.

  The size (thickness and length, etc.) of the solid-liquid contact tube, specifically the mother tube and the branch tube, depends on the type and amount of powder and liquid to be mixed and the scale as a mixing unit. The selection is not particularly limited. Normally, the branch pipe is made smaller than the mother pipe for the convenience of liquid discharge.

  Moreover, there is no restriction | limiting in particular also about each material of the said mother pipe and the said branch pipe.

  In the present invention, the branch pipe is provided through or connected to the outer periphery of the mother pipe as described above so as to communicate with the outer circumference. As for the position and direction of the penetration or connection, since the liquid discharge port is disposed in the branch pipe, the direction and position of the liquid discharge port, that is, the shape of the mother pipe and the powder transfer as described later. Depends on the position of the powder outlet of the apparatus (powder uniaxial eccentric screw pump for powder transfer), the form of powder transfer and supply (introduction), etc., but does not hinder the purpose of the present invention Within the range, it is possible to penetrate or connect to an appropriate position on the outer periphery of the mother pipe. Usually, as will be described later, in order to remove the powder adhering to the inner wall of the mother tube and to bring the liquid into contact with the powder with a high contact area, it is penetrated or connected in an efficient position and direction. For example, for the mother pipe, an elbow-shaped pipe obtained by bending a circular pipe at a predetermined angle is selected, and the branch pipe is connected to the vicinity of the elbow-shaped mother pipe (for example, a shoulder portion and an upstream end thereof). Between the main pipe and the outlet of the mixture of the powder and liquid of the mother pipe.

  The liquid discharge port has a form suitable for removing the powder adhering to the inner wall of the mother pipe and bringing it into contact with the powder with a high contact area, that is, a surface contact surface with the powder. As long as the liquid can be discharged in a planar manner (to form a planar discharge flow) toward the inside of the mother pipe, it is sufficient. Therefore, the liquid discharge port may form a surface discharge flow by one liquid discharge port that discharges the liquid in a planar shape, or may be a liquid discharge port (for example, discharge in a linear or rod shape) Etc.) may be combined to form a planar discharge flow.

  FIG. 2 is a diagram schematically showing an example of the form taken by the liquid discharged from the liquid discharge port used in the powder and liquid mixing unit according to one embodiment of the present invention. FIG. 3 is a view of a powder and liquid mixing unit according to one embodiment of the present invention when the cross section in the A-A ′ direction in FIG. 2 is viewed. Referring to FIGS. 2 and 3, in the powder and liquid mixing unit, the liquid 16 is discharged into the mother pipe 12 from the liquid discharge port 13 through the branch pipe 14 by the liquid transfer metering pump. Is done. At this time, the liquid 16 is discharged in a planar shape toward the inside of the mother pipe 12 so as to form a planar contact surface with the powder from the liquid discharge port 13, so that the liquid 16 is applied to the inner wall of the mother pipe. The adhering powder is removed, and the powder supplied from the device (vertical uniaxial eccentric screw pump for powder transfer) 11 (inflow or falling) is contacted with a high contact area. , Mixed. FIG. 4 shows a view of the powder and liquid mixing unit according to one embodiment of the present invention when the cross section in the AA ′ direction in FIG. 2 is viewed. Referring to, the liquid 16 is discharged so as to form a planar discharge flow from a combination 13 of a plurality of the liquid discharge ports. Thus, by combining a plurality of liquid discharge ports, the liquid may be discharged in a planar shape toward the inside of the mother pipe so as to form a planar contact surface with the powder.

  Therefore, in the present invention, as described above, regarding the form of the planar discharge flow constituting the planar contact surface, as described above, the powder adhering to the inner wall of the mother pipe is removed and the level of the discharge flow is high If it is a form suitable for making it contact in a contact area, it will not specifically limit. Preferably, it expands in a fan-like manner in a direction inclined by a predetermined angle toward the inflow or fall direction of the powder so as to be oblique to the inflow or fall direction of the powder, and with respect to the direction inclined by the angle It is formed as a film or laminar discharge flow that also expands in the vertical direction. The predetermined angle is not particularly limited as long as it is an efficient angle for removing the powder adhering to the inner wall of the mother pipe and bringing it into contact with the powder with a high contact area. Preferably, it is about 30 to 60 ° in the direction of powder inflow or drop.

  As described above, in the present invention, as the liquid discharge port, one or a combination of discharge ports having an appropriate structure for discharging liquid so as to form the planar discharge flow is used. However, this discharge can be performed without difficulty. FIG. 13 is an end view showing an example of a liquid discharge port used in a powder and liquid mixing unit according to an embodiment of the present invention. Referring to FIG. 13, although there is one liquid discharge port, it has a specific structure, specifically, communicates with the liquid flow path 129, and collides with the liquid supplied from the flow path to The collision surface 130 is inclined at a predetermined angle (preferably about 30 to 60 °) with respect to the liquid supply direction as a deflection angle so as to be expanded, and is further predetermined in a direction perpendicular to the liquid supply direction. It has a structure that is open over an angle (preferably about 90 to 120 °). For this reason, this liquid discharge port can discharge the liquid in a wide angle (expanded like a fan) as a film or layered discharge flow. In this case, since the liquid can be collided against the collision surface and discharged at a wide angle, a highly viscous liquid can be preferably used. On the other hand, even when combining a plurality of the liquid discharge ports, the liquid is discharged in a planar shape so as to form a planar contact surface with the powder by adopting a slit-like structure composed of a plurality of liquid discharge ports. Can be made.

  In the present invention, there is no particular limitation on the liquid ejection itself. For example, it can be discharged or ejected by a liquid transfer metering pump disposed in the branch pipe, which will be described later, but an appropriate liquid discharge device is selected and disposed separately from the liquid transfer metering pump. In addition, liquid can be discharged and ejected. Here, there is no restriction | limiting in particular about the liquid discharge apparatus used in this invention, The liquid discharge apparatus which may be well-known or developed in the future can be selected suitably, and can be used. The liquid discharge pressure may be selected according to the type of liquid selected, and is not particularly limited. For example, when water is selected as the liquid, it can be performed at about 0.2 MPaG.

  The liquid discharge port is appropriately arranged according to the form of penetration or connection of the branch pipe to the mother pipe. For example, when the branch pipe penetrates the mother pipe, the liquid discharge port can be disposed at the end of the branch pipe on the mother pipe side, and the branch pipe is connected to the mother pipe. In this case, the liquid discharge port can be disposed at the end of the branch pipe on the mother pipe side via an appropriate pipe. As for the position and direction of the liquid discharge port, the position of the powder outlet of the apparatus for transferring powder, the form of powder introduction, or the shape of the mother pipe, as with the branch pipe However, it is not particularly limited as long as it is disposed in an efficient position and direction in order to remove the powder adhering to the inner wall of the mother pipe and to contact the powder with a high contact area. In general, as described above, the inner wall of the mother pipe, preferably in the direction of the outlet of the mixture of powder and liquid, and in the direction of powder inflow or drop (for example, a suitable deflection member) The liquid is disposed so as to be discharged in a direction inclined at a predetermined angle, preferably about 30 to 60 °, toward the inflow or fall direction of the powder.

  In the powder and liquid mixing unit of the present invention, there is no particular limitation on the position of the powder inlet (in the case of a vertical uniaxial eccentric screw pump for transferring powder described later, the powder outlet). Preferably, at the upstream end portion of the mother pipe, a position is selected that is dispersed onto the planar discharge flow and stably flows in or drops (introduces). By doing in this way, the said powder and the said liquid can be made to contact in a higher contact area, and can be mixed.

  In the present invention, in order to quantitatively transfer the powder to the solid-liquid contact tube, more specifically to the mother tube, a vertical uniaxial eccentric screw pump for powder transfer is selected, and this vertical uniaxial for powder transfer is selected. An eccentric screw pump is usually provided on the upstream side of the mother pipe of the solid-liquid contact pipe. Here, the vertical uniaxial eccentric screw pump for transferring powder used in the present invention is a male screw type rotor inserted into a female screw type stator via a connecting rod of a driving wheel of a driving device provided at the upper end of a pump casing. In the uniaxial eccentric screw pump of the type that rotates the rotor, a propeller shaft projects from the lower end of the rotor so that the shaft projects downward from the powder suction port at the lower end of the stator, and powder suction blades are placed on the shaft. The powder is transported by opening the powder casing in the pump casing close to the discharge port at the upper end of the stator (see Japanese Patent No. 2660720). When such a vertical uniaxial eccentric screw pump for transferring powder is used, powder can be transferred quantitatively, and air (air) can be introduced when transferring powder. Since there is little or almost no need, a gas (air) separation means need not be provided. Note that such a vertical uniaxial eccentric screw pump for transferring powder is commercially available under the trade name “Heisin Mono pump for powder”.

  Further, in the vertical uniaxial eccentric screw pump for powder transfer, the set flow rate at the time of powder transfer is appropriately selected according to the selected powder and the transfer amount.

  Furthermore, regarding the disposition of the vertical uniaxial eccentric screw pump for powder transfer, as described above, a planar discharge flow is provided at the upstream end of the mother pipe as the disposition position of the powder inlet. It is preferable to select a position where it is dispersed and stably flowed in or dropped (introduced). The powder outlet is preferably arranged.

  In the present invention, the vertical uniaxial eccentric screw pump for transferring powder may be provided with a powder adhesion preventing member that scrapes the adhered powder at the powder outlet, which will be described later. In addition, this member can prevent moisture from adhering to the powder outlet.

  In the present invention, in order to quantitatively transfer the liquid to the solid-liquid contact tube, more specifically to the mother tube, a liquid-transfer metering pump is selected, and this liquid-transfer metering pump is usually the solid-liquid contact. Provided upstream of the branch pipe of the pipe. Here, there is no restriction | limiting in particular about the metering pump for liquid transfer used in this invention, A well-known or the metering pump which can be developed in the future can be selected suitably, and can be used. For example, a female screw rotor is connected to a drive shaft of a drive device and rotated around an eccentric center via a connecting rod, and a rotor having a circular cross section that moves and rotates in the direction of the long axis in the transverse cross section of the stator. Due to the pumping action of, a single-shaft eccentric screw pump for liquid transfer that sucks the object to be transferred (liquid) into the stator and discharges it through the stator can be used. When such a uniaxial eccentric screw pump for liquid transfer is selected, the liquid can be transferred easily and quantitatively. Specifically, as such a uniaxial eccentric screw pump for liquid transfer, a trade name “Hayshin Mono pump” is commercially available.

  In the liquid transfer metering pump, the set flow rate at the time of liquid transfer is appropriately selected according to the selected liquid and its transfer amount, and the solution or slurry that can be mixed and its transfer amount.

  The powder and liquid mixing unit of the present invention can be used for a powder and liquid mixing apparatus for mixing powder and liquid in-line and continuously producing a solution or slurry.

(Powder and liquid mixing device of the present invention)
The powder and liquid mixing apparatus of the present invention is a powder and liquid mixing apparatus for mixing powder and liquid in-line and continuously producing a powder and liquid mixture, A unit, that is, a powder and liquid mixing unit of the present invention, and a vertical uniaxial eccentric screw pump for powder transfer for quantitative transfer of the powder is provided upstream of the mother pipe of the unit, and the liquid is determined A metering pump for transferring the liquid to be transferred is provided on the upstream side of the branch pipe of the unit. Accordingly, the solution or slurry is blocked at the powder outlet of the solid-liquid contact tube (in particular, the mother tube in the present invention) or the powder transfer device (vertical uniaxial eccentric screw pump for powder transfer). Or can be prepared (manufactured) simply and continuously (in-line). This is especially true in the case of producing a solution or slurry by mixing fine particle powder and liquid, or in the case of producing a high concentration and / or high viscosity solution or slurry by mixing powder and liquid. For the mixing of fine particles of powder and liquid, a simple solution or slurry can be produced continuously without being clogged in a solid-liquid contact tube or the like or suppressed with a very high probability. Alternatively, it is extremely excellent as a powder and liquid mixing apparatus for producing a highly viscous solution or slurry.

  FIG. 5 is a diagram showing a schematic configuration of a powder and liquid mixing apparatus according to one embodiment of the present invention. Referring to FIG. 5, in the powder and liquid mixing apparatus, the unit described above, that is, the powder and liquid mixing unit 19 of the present invention is provided. The unit is a solid liquid composed of a mother pipe serving as a flow path for powder, liquid, and a mixture thereof, and a branch pipe serving as the liquid flow path penetrating the outer circumference of the mother pipe so as to communicate therewith. A contact tube is provided. The mother pipe is a circular pipe, and has an elbow shape obtained by bending the circular pipe at a predetermined angle. The mother pipe has a powder inlet through which powder flows in or drops, and a mixture outlet through which a mixture of powder and liquid is derived. On the other hand, the branch pipe is a circular pipe and is provided in the vicinity of the elbow-shaped mother pipe, specifically, between the shoulder portion and the upstream end portion thereof. In addition, a liquid discharge port capable of discharging liquid in a planar shape toward the inside of the mother pipe so as to form a planar contact surface with the powder at the end of the branch pipe on the mother pipe side Is arranged. In the solid-liquid contact tube, on the upstream side of the mother tube, a vertical uniaxial eccentric screw pump 21 for powder transfer for quantitatively transferring powder is provided. The eccentric screw pump 21 is connected via a lid so that powder does not scatter from the inside of the mother pipe to the outside thereof. Furthermore, a liquid transfer metering pump 22 for metering and transporting the liquid is disposed at the upstream end of the branch pipe, and the liquid is supplied to the liquid discharge port by the liquid transporting metering pump, and the liquid discharge port. It is discharged from the outlet.

  The mixing unit used in the powder and liquid mixing apparatus of the present invention is as described above.

  As described above, FIG. 5 is a diagram showing a schematic configuration of a powder and liquid mixing apparatus according to one embodiment of the present invention. Referring to FIG. The liquid transfer metering pump 22 provided on the upstream side of the branch pipe of the liquid contact pipe is transferred to and supplied to a liquid discharge port (nozzle) 20 provided at the end of the branch pipe on the mother pipe side. . Further, the liquid transferred to the liquid discharge port (nozzle) 20 is supplied from the liquid discharge port (nozzle) 20 by the liquid transfer metering pump 22 so as to form a surface contact surface with the powder. It is discharged in a planar shape toward the inside of the tube. On the other hand, in synchronism with the discharge of the liquid, the powder is transferred from the storage tank to the mother pipe by a vertical uniaxial eccentric screw pump 21 for transferring powder provided on the upstream side of the mother pipe of the solid-liquid contact pipe. , Supplied, that is, inflow (specifically, dropped). Next, the liquid and the powder discharged into the mother pipe are contacted and mixed in the mother pipe with a high contact area.

  There is no restriction | limiting in particular about the storage tank used in this invention, The thing generally used in order to store a powder, a liquid, a solution, or a slurry is selected.

  There is no restriction | limiting in particular about the powder used in this invention, According to the objective, it selects. For example, powder such as cement powder, activated carbon, slaked lime, flocculant powder, etc., which becomes a low-viscosity solution or slurry when mixed with water, for example, silica powder (for example, It is possible to use fine particles such as aerosil), powders such as corn starch, diatomaceous earth, and the like, powders that form a highly viscous solution or slurry when mixed with water, for example, water, especially fine particles. it can. In the present invention, the “highly viscous” solution or slurry includes, for example, a solution or slurry having a viscosity of at most 20000 cP (20000 cP or less), in particular, about 1 to 10000 cP. Suitable for the production of such solutions or slurries. In the present invention, the fine particle powder means a powder having an average aggregate particle size of 10 μm (10 μm or less) at most, and includes an aerosol fine particle powder having an average aggregate particle size of about 1 to 10 μm. It is.

  About the said powder, 1 type, or 2 or more types of powder can be used. Specifically, for example, when normal Portland cement powder is used, it is necessary to add such additives as blast furnace slag, fly ash, expansion material, rapid hardening material, etc. in advance. Can be mixed in an appropriate amount.

  There is no restriction | limiting in particular about the liquid used in this invention, It selects according to the objective, For example, low-viscosity fluids, such as water and oil, a highly viscous fluid, a chemical | medical agent, etc. can be used.

  FIG. 6 is a diagram showing a schematic configuration of a powder and liquid mixing unit used in the powder and liquid mixing apparatus according to one embodiment of the present invention. Referring to FIG. 6, on the upstream side of the solid-liquid contact tube, more specifically, the mother tube 32 serving as a flow path for powder, liquid and a mixture thereof, a vertical uniaxial for powder transfer for quantitatively transferring powder. An eccentric screw pump 31 is disposed via the lid 35. The powder type vertical uniaxial eccentric screw pump 31 is provided with a powder adhesion preventing member 36 that scrapes off the powder adhering to the powder outlet port. That is, in FIG. 6, a metal wire (about φ3 mm) is fixed to the rotor 37 as the powder adhesion preventing member. Therefore, the powder adhering prevention member 36 is attached at the powder outlet by the rotation of the powder adhering member, specifically, the rotation of the powder adhering prevention member 36 in contact with the inner wall of the powder outlet or through the vicinity thereof. Since the powder can be scraped off and moisture can be prevented from adhering to the powder outlet, it is possible to eliminate or block the powder at the outlet with a very high probability. It becomes possible to produce a solution or slurry continuously for a period of time. Therefore, for example, in the case of a short-term operation in which a powder and liquid mixing device is operated for about one day and cleaning is performed each time, it is not always necessary to provide the powder adhesion preventing member. For example, when the powder and liquid mixing device is operated continuously for a long period of time of one week or longer, it is extremely effective to provide the powder adhesion preventing member.

  As for the shape of the powder adhesion preventing member, a suitable shape is usually selected so that the powder adhesion preventing member is rotated so as to be in contact with or pass through the inner wall of the powder outlet. In addition, the powder adhesion preventing member is also rotated so as to be in contact with the inner wall of the powder outlet or in the vicinity thereof.

  There is no restriction | limiting in particular about the said powder adhesion prevention member and its fixing method. For example, one or a plurality of rotors can be selected and arranged in a device for rotating the rotor, and this can be separately provided in the outlet port by a known fixing method such as welding, or can be used for vertical transfer for powder transfer. One or a plurality of rotors can be fastened to the rotor of the type uniaxial eccentric screw pump by welding or the like. In particular, when the rotor is fixed to the rotor, the rotor as the powder adhesion preventing member rotates in conjunction with the driving (rotation) of the rotor (using the rotation of the rotor), and the powder This is convenient because the attached powder is scraped off at the outlet and the adhesion of moisture at the outlet of the powder can be prevented. The powder adhesion preventing member has, for example, an appropriate size (for example, an appropriate width or thickness of about 3 to 6 mm, or a diameter and length of φ3 to 6 mm (for example, 5 to 20 cm)). A plate-like metal, rod-like or thread-like metal (for example, metal wire) can be selected.

  When the powder and liquid mixing apparatus of the present invention is provided with a specific high dispersion mixing apparatus, it is possible to suppress the aggregation of the powder in the liquid, and thus when producing a high concentration solution or slurry. Preferably used. That is, the powder and liquid mixing apparatus according to the present invention is a large amount of powder, specifically, about 3 times the volume of the liquid, and the solid-liquid contact tube. It is suitable for transferring to the mother pipe. For example, referring to FIG. 5, a high dispersion mixing device 24 is disposed through a pipe at the downstream end of the mother pipe, and the liquid and powder discharged into the solid-liquid contact pipe are After contact and mixing at a high contact area in the mother pipe, it is transported and supplied to the high dispersion mixing device 24.

  Here, the high dispersion mixing device is for dispersing the powder in the liquid with a high dispersion force using a shearing force. Such a high dispersion mixing apparatus includes, for example, a stirring device 27 as shown in FIG. 5, and the stirring device 27 includes a plurality of stirring members (disks) 25 and a rotating shaft 26. The agitating member 25 has an appropriate shape, for example, a star shape, and a plurality of agitating members 25 are inclined with respect to the rotating shaft 26 at a predetermined angle around the adjacent agitating member and the rotating shaft 26. Yes. The liquid is sucked into the high dispersion mixing device 24 by the rotation of the stirring member 25 by the rotation of the rotating shaft 26, and the powder is highly dispersed in the liquid by the high dispersion force obtained by the shearing force by the rotation of the stirring member 25. Therefore, a highly dispersible solution or slurry is obtained. Therefore, a highly concentrated solution or slurry can be obtained. In addition, there is no restriction | limiting in particular about the number of said stirring members, and a rotational speed, For example, in the case of the slurry of a silica and water, it can be rotated at about 1800 rpm with five stirring members.

  In the present invention, by providing a mixture or dispersion metering pump for transferring the powder and the liquid mixture or dispersion on the downstream side of the high dispersion mixing device, a higher concentration and a higher concentration can be obtained. A viscous solution or slurry can be obtained, i.e. a large amount of powder can be transferred to the mother tube and mixed with the liquid. FIG. 7 is a diagram showing a schematic configuration of a powder and liquid mixing apparatus according to an embodiment of the present invention. Referring to FIG. 7, the high dispersion mixing apparatus 47 includes a mixture or dispersion transfer. A metering pump 51 is provided. Therefore, when the powder is dispersed in the liquid with a high dispersion force using a shearing force as described above, the liquid is dispersed by the metering pump 51 for transferring the mixture or the dispersion. Therefore, a solution or slurry having a high concentration and high viscosity (high viscosity) can be obtained. In addition, there is no restriction | limiting in particular about the metering pump for the said mixture thru | or dispersion | distribution, A well-known or the metering pump which can be developed in the future can be selected suitably, and can be used. For example, the above-described metering pump for liquid transfer can be used. The arrangement position of the metering pump for transferring the mixture or dispersion is the same as that of the metering pump (extrusion type, suction type, etc.) for transferring the mixture or dispersion or the powder and liquid mixing device as a whole. It may be determined accordingly.

  Further, in the present invention, a solution or slurry having a higher concentration obtained (manufactured) by mixing and dispersing the powder and the liquid to be uniform is returned to a storage tank for storing the liquid. By this, a very high concentration solution or slurry can be produced. FIG. 8 is a diagram showing a schematic configuration of a powder and liquid mixing apparatus according to one embodiment of the present invention. Referring to FIG. 8, the high dispersion mixing apparatus 63 includes a liquid via a pipe. A storage tank 59 is stored. Further, in this high dispersion mixing device 63, the liquid is stored as a solution or slurry obtained by mixing and dispersing the powder and the liquid with the high dispersion mixing device 63 so as to branch through a pipe. A return device (not shown) for returning to the storage tank 59 is arranged.

  The return device is not particularly limited. By providing such a return device in the powder and liquid mixing device of the present invention, the return to the storage tank storing the liquid of higher concentration solution or slurry from this highly dispersed mixing device is extremely high. A concentrated solution or slurry can be obtained.

  In particular, in the powder and liquid mixing apparatus of the present invention, a solution or slurry obtained by mixing (dispersing) by providing a specific mixture homogenizing apparatus for further uniformly mixing the powder and liquid mixture. Can be produced by mixing (dispersing) more uniformly. FIG. 9 is a diagram illustrating a schematic configuration of a powder and liquid mixing apparatus according to an embodiment of the present invention. Referring to FIG. A dispersion mixing device 76 is disposed, and the high dispersion mixing device 76 is provided with a mixture homogenizing device 77 for further uniformly mixing the powder and liquid mixture via a pipe. In this way, a more uniform high-concentration and / or high-viscosity solution or slurry can be prepared.

  There is no restriction | limiting in particular about the said mixture homogenization apparatus, The mixing apparatus well-known or can be developed in the future can be selected appropriately, and can be used. In particular, it is preferable to use a static type pipe stirrer (static mixer).

  Here, the static type pipe stirrer (static mixer) is composed of a pipe and a mixing element (mixing element) having no movable part that is fixed (fixed) in the pipe by welding or the like, and stirs the fluid in the pipe. To change the relative positional relationship of the fluid in the cross section of the tube, i.e. to increase the contact flow of the fluid with the tube wall and the element of the tube It has the structure which promotes mixing by the swirl flow by.

  The mixing element is a plurality of baffle plates that are sequentially arranged in the axial direction of the tube and are twisted at a predetermined angle around the tube axis, the axial end portions of which are adjacent to the end portions of the adjacent baffle plates. The thing which consists of the baffle board arranged by crossing etc. can be used. In the present invention, a plurality of baffle plates that are sequentially arranged in the axial direction inside the tube and are twisted by a predetermined angle around the tube axis, the end portions of the adjacent baffle plates having axial end portions adjacent to each other. It is preferable to select an element (mixing element described in Japanese Patent Publication No. 1-31928) made of baffle plates arranged so as to cross each other.

  In addition, about the said mixture homogenizer, one or more can be arrange | positioned in the downstream of the said highly dispersed mixing apparatus. By disposing such a mixture homogenizer, the powder and liquid can be mixed more uniformly.

  In the powder and liquid mixing apparatus of the present invention, the pipe used in the present invention, the pipe that becomes the flow path of the liquid (particularly the branch pipe), and the pipe that becomes the flow path of the mixture of the powder and liquid are washed. A cleaning device can be provided at an appropriate position. At this time, there is no restriction | limiting in particular about the said washing | cleaning apparatus, The washing | cleaning apparatus which can be well-known or developed in the future can be selected and used. The cleaning liquid used in the cleaning apparatus is not particularly limited, but generally the same liquid as the liquid to be mixed is selected.

  In the present invention, other devices or means such as a valve for adjusting the flow rate of powder and / or liquid, a device for transferring the prepared (manufactured) solution or slurry to a storage tank of the solution or slurry, etc. The powder and liquid mixing apparatus can also be included in the powder and liquid mixing apparatus of the present invention.

  There is no restriction | limiting in particular about the material of piping used in this invention. For example, SUS304 can be used from the viewpoint of corrosion resistance. Moreover, there is no restriction | limiting in particular also about the shape and magnitude | size of the said piping, What is necessary is just to select suitably according to the kind and quantity of the powder or liquid selected, the scale as a mixing apparatus, etc.

  In the present invention, a measuring instrument such as a flow meter (instruments) can be appropriately disposed if necessary, and for this measuring instrument, a measuring instrument that can be known or developed in the future can be selected and used. .

  The powder and liquid mixing apparatus of the present invention removes the powder adhering to the inner wall of the mother pipe as described above in the solid-liquid contact tube, specifically the mother pipe, and the powder. In order to make contact with the body with a high contact area, the liquid is supplied to the liquid discharged in a plane toward the inside of the mother pipe so as to form a planar contact surface with the powder (inflow) Or the liquid and the powder are brought into contact with each other at a high contact area (specifically, the volume ratio of liquid: powder can be contacted up to 1: 0.5 in the past, whereas In the present invention, the volume ratio of liquid: powder can be contacted up to 1: 3), uniformly mixed, and further inside the mother pipe (more specifically, near the point where the liquid and powder come into contact) or powder Eliminate or eliminate blockage at the powder outlet (powder inlet of the main pipe) of the vertical uniaxial eccentric screw pump for body transfer The average agglomeration, which is suppressed with a high probability, floats on the surface of the liquid, especially when dissolved or dispersed, and increases in viscosity with increasing concentration due to dissolution or dispersion in the liquid, making dissolution or dispersion difficult. This achieves in-line production of a solution or slurry having a particularly high concentration and / or high viscosity obtained by mixing a powder such as fine particle silica having a particle size of about 1 to 10 μm and a liquid.

Therefore, according to the present invention, even when the solution or slurry obtained by mixing the powder and the liquid is highly viscous, the liquid is in the specific form as described above. Since the powder can be mixed in the liquid without floating on the liquid surface, the powder and the liquid are mixed. Can do. For example, when mixing diatomaceous earth having a bulk density of 0.6 g / cm ³ and becoming a highly viscous solution or suspension (slurry) when mixed with a liquid, particularly water, the water flow rate is The flow rate of diatomaceous earth having a bulk density of 0.6 g / cm ³ when 1300 kg / H is set can be a maximum of 1590 kg / H (slurry concentration after mixing: a maximum of about 55 wt%). When used (for example, when diatomaceous earth having a bulk density of 0.6 g / cm ³ is mixed with water, the flow rate of diatomaceous earth having a bulk density of 0.6 g / cm ³ when the water flow rate is 1300 kg / H Compared to a maximum of 390 kg / H (concentration of the slurry after mixing: a maximum of about 23 wt%)), the solution or slurry after mixing, particularly the concentration of the slurry, is adjusted in-line. It can be.

  In particular, according to the present invention, the solution or slurry obtained by mixing the powder and the liquid is highly viscous, and the fine particles are such that the powder floats on the liquid surface of the liquid. Even in the case of powder, since the liquid is discharged in the specific form as described above, the powder is not floated on the liquid surface. Can be mixed in the liquid. For example, in the case of mixing fine particle silica powder and water, the flow rate of fine particle silica powder when the water flow rate is 500 kg / H is a maximum of 214 kg / H (concentration of slurry after mixing: a maximum of about 30 wt%). In particular, when using an ejector (for example, when mixing fine silica powder and water, the flow rate of the fine silica powder when the water flow rate is 500 kg / H is 25 kg / H ( Compared to the concentration of the slurry after mixing: a maximum of about 5 wt%)), the concentration of the suspension or solution after mixing can be prepared in-line so as to be high. That is, even when the powder is a fine particle powder (for example, silica or the like), the powder is prevented from floating on the liquid surface or suppressed with a very high probability. Mixing of the powder and the liquid can be performed.

  Moreover, since the powder and liquid mixing apparatus of the present invention does not require a separate mixing tank that has been conventionally used, compared to conventional batch (batch) type powder and liquid mixing apparatuses, The entire powder and liquid mixing device is small (compact).

(Production method of powder and liquid mixture of the present invention)
The method for producing a mixture of powder and liquid according to the present invention is a method for producing a planar contact surface between the powder to be introduced or dropped and the powder in the method for producing a mixture of powder and liquid. A method of producing a mixture of powder and liquid, characterized in that it includes a step of contacting the liquid to be discharged in a shape (to form a planar discharge flow).

  The method for producing a mixture of powder and liquid of the present invention further includes a powder adhesion preventing step of scraping off the powder adhered at the powder outlet of the vertical uniaxial eccentric screw pump for powder transfer, A step of cleaning the pipe, the pipe serving as the liquid flow path, and the pipe serving as the solution or slurry flow path may be included.

  In the method for producing a mixture of powder and liquid according to the present invention, the powder is dispersed on the liquid to be discharged in a planar shape (planar discharge flow) and stably flowed in or dropped (introduced). ).

  In particular, in the method for producing a mixture of powder and liquid according to the present invention, the discharge of the liquid so as to constitute the planar contact surface is performed so that the powder flows obliquely to the inflow or fall direction of the powder. The film is expanded in a direction inclined by a predetermined angle toward the inflow or fall direction of the film, and a film or a laminar discharge flow is also formed which extends in a direction perpendicular to the inclined direction. it can.

  In addition, about this invention, it can implement easily based on the description in the powder and liquid mixing unit of this invention of the said description, and the powder and liquid mixing apparatus of this invention.

(In-line production method of powder and liquid mixture of the present invention)
The method for producing an in-line mixture of powder and liquid according to the present invention is a method for producing a mixture of powder and liquid in which powder and liquid are mixed in-line to continuously produce a mixture of powder and liquid. A process for producing a mixture of powder and liquid characterized by comprising the following steps:
a. A step of allowing a powder to flow in or drop from a powder storage tank by a vertical uniaxial eccentric screw pump for transferring powder;
b. Discharging the liquid in a fixed amount so as to form a surface contact surface with the powder (to form a surface discharge flow); c. The step of bringing the powder that flows in or drops into contact with the liquid that is discharged in a planar shape so as to form a planar contact surface between the powder and the powder.

  In the in-line method for producing a mixture of powder and liquid according to the present invention, the powder is dispersed on the liquid to be discharged in a planar shape (planar discharge flow) and stably flows in or drops ( Introduction).

In the in-line production method of the powder and liquid mixture of the present invention, if necessary,
d. The powder and the liquid obtained by bringing the powder and the liquid into contact in the step c are dispersed in the liquid with a high dispersion force using a shearing force. Process, if necessary,
e. A step of returning the dispersion of the powder and the liquid obtained by dispersing the powder to the liquid in the step d to a storage tank storing the liquid can be included.

In the in-line production method of the powder and liquid mixture of the present invention,
f. A step of mixing the powder and the liquid obtained by bringing the powder and the liquid into contact with each other so as to be more uniform can be included. In the present invention, the step f is performed after the step d.

  In the in-line production method of the powder and liquid mixture of the present invention, the step of mixing the powder and the liquid described above so as to be more uniform, preferably by a stationary pipe stirrer. In addition, in the powder outlet of the vertical uniaxial eccentric screw pump for powder transfer, a powder adhesion preventing process for scraping off the adhered powder, a pipe, and a pipe serving as the liquid flow path And a step of washing a tube serving as a flow path for the mixture of the liquid and the powder.

  In particular, in the in-line method for producing a mixture of powder and liquid according to the present invention, the discharge of the liquid so as to constitute the planar contact surface is oblique to the inflow or fall direction of the powder. In order to form a film or laminar discharge flow that expands in a fan-like manner in a direction inclined by a predetermined angle toward the inflow or fall direction of the powder and also extends in a direction perpendicular to the direction inclined by the angle. It can be carried out.

  In addition, about this invention, it can implement easily based on the description in the powder and liquid mixing unit of this invention of the said description, and the powder and liquid mixing apparatus of this invention.

  According to the in-line manufacturing method of the powder and liquid mixture of the present invention, the solid-liquid contact tube where the liquid and the powder come into contact, more specifically, the powder adhering to the inner wall of the mother tube in the mother tube. In order to make contact with the powder with a high contact area, the liquid is discharged into the liquid discharged in a plane toward the inside of the mother pipe so as to form a planar contact surface with the powder. Supply the body (inflow or drop) to bring the liquid and powder into contact with each other with a high contact area and mix them uniformly. Furthermore, the inside of the mother tube (specifically, the point where the liquid and powder come into contact) and powder The blockage at the powder outlet (powder inlet of the mother pipe) of the vertical uniaxial eccentric screw pump for body transfer is eliminated or suppressed with a very high probability. Therefore, powders, especially fine powders and liquids such as silica, which float on the liquid surface during dissolution or dispersion, increase in viscosity with increasing concentration due to dissolution or dispersion in the liquid, and become difficult to dissolve or disperse. In particular, a highly concentrated and / or highly viscous solution or slurry can be easily produced in-line.

  EXAMPLES Hereinafter, although an Example and a comparative example demonstrate this invention in detail, this invention is not restrict | limited at all by this Example and a comparative example.

[Examples 1-4] Production Examples-1 to 4 of solutions or slurries
FIG. 10 is a diagram showing a schematic configuration of a powder and liquid mixing apparatus (product of the present invention) according to an embodiment of the present invention. A powder and liquid mixing unit 83 having a solid-liquid contact tube is provided. This solid-liquid contact tube is composed of an elbow-shaped mother tube obtained by bending a circular tube by about 90 °, and a cylindrical (circular) branch tube penetrating on the outer periphery thereof so as to communicate therewith. In this branch pipe, the end on the mother pipe side communicates with a liquid flow path as a liquid discharge port, and deflects to collide with the liquid supplied from the flow path and expand it in a fan-like manner. It has a collision surface inclined at a predetermined angle (about 30 to 60 °) with respect to the liquid supply direction as an angle, and further over a predetermined angle (about 90 to 120 °) in a direction orthogonal to the liquid supply direction. It has a structure that spreads and opens, expands in a fan-like manner in a direction inclined by a predetermined angle toward the direction of powder introduction (falling), and obliquely intersects with the direction of powder introduction (falling). Water is formed in the direction of the inner wall of the mother pipe, specifically in the direction of the outlet of the mixture of powder and liquid, so as to form a film or a laminar discharge flow that also extends in a direction perpendicular to the angle-tilted direction. There is one nozzle 82 that can be ejected. The other end is provided with a uniaxial eccentric screw pump 85 for transferring liquid via a pipe. Further, the uniaxial eccentric screw pump 85 for liquid transfer is connected to a liquid storage tank 86 via a pipe. In addition, at the upstream end of the mother-liquid contact tube, a powder inlet is arranged so as to be dispersed and stably dropped onto the water forming the discharge flow. A vertical uniaxial eccentric screw pump 81 for transferring powder is arranged through a lid and a pipe, and the vertical uniaxial eccentric screw pump 81 for transferring powder is connected to a powder storage tank 84. . The lid is provided with an exhaust port and a filter for balancing the pressure inside the solid-liquid contact tube. A high shear mixer 90 is disposed as a high dispersion mixing device at the downstream end of the mother pipe. The high shear mixer 90 includes a stirring device 89 including a rotating shaft 88 and five star-shaped stirring members (disks) 87. A pipe is connected to the downstream side of the high shear mixer 90 so as to branch, and the manufactured solution or slurry is transferred to the solution or slurry storage tank (not shown) through the pipe. .
Using this powder and liquid mixing apparatus, various solutions or slurries were produced by the following method based on the conditions of the powder components and the liquid components described in the columns of the examples in Table 1 below.

(Manufacture of solution or slurry)
(1) Various powder components were introduced into the storage tank 86 as liquid and water, and into the storage tank 84 as powder.
(2) Water was transferred and supplied from the storage tank 86 to the nozzle 82 by the uniaxial eccentric screw pump 85 for liquid transfer so that the flow rate of water became 500 kg / H.
(3) A predetermined angle toward the powder introduction (falling) direction so that the water from the nozzle 82 is obliquely crossed with the powder introduction (falling) direction of the vertical uniaxial eccentric screw pump 81 for powder transfer. An inner wall of the mother pipe so as to form a film or a laminar discharge flow that expands in a fan-like direction (about 45 °) and expands in a direction perpendicular to the direction inclined by a predetermined angle; Specifically, it was ejected in the direction of the outlet for the mixture of powder and liquid.
(4) In synchronism with (3) (synchronized with the jet of water), various powder components are transferred from the storage tank 84 to the mother pipe by a vertical uniaxial eccentric screw pump 81 for transferring powder to a flow rate of 214 kg. It was transferred and supplied at / H, that is, dropped. At this time, air (air) was hardly introduced.
(5) After the water and various powder components supplied to the mother pipe are brought into contact with each other in the mother pipe, the resulting mixture of water and various powder components is transferred to the high shear mixer 90 and supplied to be mixed uniformly. And various powder component solutions or slurries. At this time, the stirring member 87 in the high shear mixer was rotated at 1800 rpm.

(result)
As a result, by using the powder and liquid mixing apparatus of the present invention, it was possible to easily produce various powder solutions or slurries with a stable concentration of 30 wt% in-line. Moreover, no blockage occurred in the solid-liquid contact tube.

[Example 5] Slurry Production Example-5
FIG. 12 is a diagram showing a schematic configuration of a powder and liquid mixing apparatus (product of the present invention) according to an embodiment of the present invention. Example 1 except that a metal wire 114 having a diameter of about 3 mm is fixed to a rotor (not shown) as a powder adhesion preventing member at a powder outlet of a vertical uniaxial eccentric screw pump 112 for transferring powder. This is the same device as the powder and liquid mixing device used in the above. Using such a powder and liquid mixing apparatus, a slurry was produced in the same manner as in Example 1 based on the conditions of the powder component and liquid component described in the column of Example 5 in Table 2 below.

(result)
As a result, by using the powder and liquid mixing apparatus of the present invention, it was possible to easily produce a slurry of fine powder having a stable concentration of 30 wt% and high viscosity in-line. In addition, no blockages were observed at the powder outlet of the solid-liquid contact tube and the vertical uniaxial eccentric screw pump for powder transfer.

  From the above, in the powder and liquid mixing apparatus of the present invention, there is no blockage in the solid-liquid contact tube or the powder outlet, or it is suppressed with a very high probability. It is clear that viscosities and / or concentrated solutions or slurries are conveniently produced in-line.

[Comparative Example 1] Slurry Production Example-6
FIG. 11 is a diagram illustrating a schematic configuration of a powder and liquid mixing apparatus (comparative product) according to a comparative example. A vertical uniaxial eccentric screw pump 105 for transferring powder is connected to a powder storage tank 106 through a pipe. The vertical uniaxial eccentric screw pump 105 for transferring powder is also connected to a dissolution tank 108 via a pipe 107. On the other hand, a liquid is stored in the dissolution tank 108, a stirring device 109 is provided, and the stirring device 109 rotates in the direction of the arrow.
Using this powder and liquid mixing apparatus, a slurry was produced by the following method based on the powder component and liquid component conditions described in the column of Comparative Example 1 in Table 3 below.

(Manufacture of slurry)
(1) A powder component was introduced into the storage tank 108 as liquid and water, and a powder component was introduced into the storage tank 106 as powder.
(2) Various powder components were transferred from the storage tank 106 to the storage tank 108 by a vertical uniaxial eccentric screw pump 105 for transferring powder at a flow rate of 125 kg / H.
(3) The mixture was stirred by the stirring device 109, and water and the powder component were uniformly mixed to obtain a slurry of the powder component.

(result)
As a result, in the case of using the powder and liquid mixing device of the comparative example, when producing a high-viscosity slurry using silica fine particle powder, it is possible to produce a slurry having a concentration of 20 wt% in-line. did it.

[Example 6] Evaluation of various powder and liquid mixing devices Evaluation of the powder and liquid mixing devices used in Example 5 and the powder and liquid mixing devices used in Comparative Example 1, that is, fine particles Evaluation was made when slurry was produced by mixing powder and liquid.

(Evaluation results)
When the powder and liquid mixing device used in Example 5 and the powder and liquid mixing device used in Comparative Example 1 are compared, the slurry produced by the powder and liquid mixing device used in Comparative Example 1 Is lower in concentration than the slurry produced by the powder and liquid mixing apparatus used in Example 5. That is, in the powder and liquid mixing apparatus of the comparative example (powder and liquid mixing apparatus used in Comparative Example 1), the produced slurry is the powder and liquid mixing apparatus of the present invention (Example 5). Compared with the slurry produced by the powder and liquid mixing device used in the above, the concentration is extremely low, and it is difficult to mix the fine particle powder and the liquid at a high concentration.

  From the above, in the powder and liquid mixing apparatus of the present invention, there is no blockage in the solid-liquid contact tube or the powder outlet, or it is suppressed with a very high probability, so that the solution or slurry, particularly, over a long period of time. It is clear that high viscosity and / or high concentration solutions or slurries are conveniently produced in-line. Further, according to the present invention, even in the case of mixing fine particle powder and liquid, a solution or slurry, in particular, a high concentration, or a solution or slurry having a high concentration and high viscosity, is in-line and solid-liquid contacted. It is possible to provide a fine particle powder and liquid mixing device that can be easily manufactured without clogging in the tube or suppressed with a very high probability. Therefore, the powder and liquid mixing apparatus of the present invention is particularly useful in the case of operating for a long period of time, for example, continuously for one week or more.

FIG. 1 is a diagram showing a schematic configuration of a powder and liquid mixing unit according to one embodiment of the present invention. FIG. 2 is a diagram schematically showing an example of the form taken by the liquid discharged from the liquid discharge port used in the powder and liquid mixing unit according to one embodiment of the present invention. FIG. 3 is a view of a powder and liquid mixing unit according to one embodiment of the present invention when the cross section in the A-A ′ direction in FIG. 2 is viewed. FIG. 4 is a view of a powder and liquid mixing unit according to one embodiment of the present invention when a cross section in the A-A ′ direction in FIG. 2 is viewed. FIG. 5 is a diagram showing a schematic configuration of a powder and liquid mixing apparatus according to one embodiment of the present invention. FIG. 6 is a diagram showing a schematic configuration of a powder and liquid mixing unit used in the powder and liquid mixing apparatus according to one embodiment of the present invention. FIG. 7 is a diagram showing a schematic configuration of a powder and liquid mixing apparatus according to one embodiment of the present invention. FIG. 8 is a diagram showing a schematic configuration of a powder and liquid mixing apparatus according to one embodiment of the present invention. FIG. 9 is a diagram showing a schematic configuration of a powder and liquid mixing apparatus according to one embodiment of the present invention. FIG. 10 is a diagram showing a schematic configuration of a powder and liquid mixing apparatus (product of the present invention) according to an embodiment of the present invention. FIG. 11 is a diagram illustrating a schematic configuration of a powder and liquid mixing apparatus (comparative product) according to a comparative example. FIG. 12 is a diagram showing a schematic configuration of a powder and liquid mixing apparatus (product of the present invention) according to an embodiment of the present invention. FIG. 13 is an end view showing an example of a liquid discharge port used in a powder and liquid mixing unit according to an embodiment of the present invention.

Explanation of symbols

1, 11, 21, 31, 42, 55, 68, 81, 105, 112. Uniaxial eccentric screw pump for powder transfer 2, 12, 32. Mother pipe 3, 13, 20, 33, 44, 57, 70, 82, 116. Liquid discharge port 4, 14, 34. Branch pipe 5, 15, 35. Lid 6. 6. Powder inlet port Mixture outlet 8, 17, 28, 40, 52, 64, 78, 91, 110, 111, 125. Direction of introduction of powder 9, 18, 29, 39, 53, 65, 79, 92, 126. Liquid introduction direction 10, 41. 15. Derivation direction of powder and liquid mixture Liquid 19, 43, 56, 69, 83, 115. Powder and liquid mixing unit 22, 45, 58, 71, 85, 117. Metering pumps for liquid transfer 23, 46, 59, 72, 86, 118. Liquid reservoir 24, 47, 63, 76, 90, 122. High dispersion mixer (high shear mixer)
25, 48, 60, 73, 87, 119. Stirring member 26, 49, 61, 74, 88, 120. Rotating shaft 27, 50, 62, 75, 89, 121. Stirring device 30, 54, 66, 67, 80, 93, 104, 124. Solution or slurry outlet direction 36,114. Powder adhesion preventing member 37. Rotor 38. 51. Direction of rotation of powder adhesion preventing member Pump 77. Mixer homogenizer (static mixer)
75. Uniaxial eccentric screw pump for solution or slurry transfer 84,106,113. Powder storage tank 107. Piping 108. Dissolution tank 109. Stirring device 127. Liquid discharge port 128. Deflection angle 129. Liquid flow path 130. Collision surface

Claims (27)

A mother pipe having a bottom surface on a substantially curved surface, a powder inlet through which powder flows in or drops, and a mixture outlet through which a mixture of powder and liquid is derived;
A branch pipe serving as a liquid flow path penetrating or connected to communicate with the outer periphery of the mother pipe;
A liquid discharge port that discharges the liquid in a plane toward the inside of the mother pipe so as to form a planar contact surface with the powder, which is disposed at an end of the branch pipe on the mother pipe side. And a powder and liquid mixing unit.   The unit according to claim 1, wherein the liquid discharge port forms a planar discharge flow by one liquid discharge port that discharges a liquid in a planar shape or by combining a plurality of liquid discharge ports.   The planar discharge flow constituting the planar contact surface expands in a fan-like manner in a direction inclined at a predetermined angle toward the inflow or fall direction of the powder so that it crosses the inflow or fall direction of the powder. The unit according to claim 1, wherein the unit is formed as a discharge flow in a film or a layer extending in a direction perpendicular to the direction inclined at the angle.   The arrangement position of the powder inlet is a position where the powder inlet is dispersed and stably flowed or dropped onto a planar discharge flow at the upstream end of the mother pipe. The unit according to any one of the above.   The unit according to any one of claims 1 to 4, which is used for a powder and liquid mixing device for mixing powder and liquid in-line and continuously producing a solution or slurry. A powder and liquid mixing device for mixing powder and liquid in-line and continuously producing a powder and liquid mixture,
A unit according to any one of claims 1 to 5,
A vertical uniaxial eccentric screw pump for powder transfer for quantitative transfer of the powder is provided on the upstream side of the mother pipe of the unit,
An apparatus for mixing powder and liquid, comprising: a metering pump for transporting the liquid in a fixed amount, upstream of the branch pipe of the unit.   The apparatus according to claim 6, further comprising a high dispersion mixing device that disperses the powder with respect to the liquid with a high dispersion force using a shearing force at a downstream end portion of the mother pipe of the unit.   The apparatus according to claim 7, further comprising a metering pump for transferring the mixture or dispersion for transferring the mixture or dispersion of the powder and the liquid on the downstream side of the high dispersion mixing apparatus.   A return device for returning a solution or slurry obtained by mixing and dispersing the powder and the liquid with the high dispersion mixing device to a storage tank for storing the liquid, on the downstream side of the high dispersion mixing device. 9. The apparatus according to 8.   The apparatus according to claim 7, further comprising a mixture homogenizer that further uniformly mixes the mixture of the powder and the liquid on the downstream side of the high dispersion mixer.   The apparatus according to claim 6, wherein the powder obtained by mixing the powder and the liquid is a highly viscous slurry.   The apparatus according to any one of claims 6 to 11, wherein the vertical uniaxial eccentric screw pump for transferring powder includes a powder adhesion preventing member that scrapes off the powder adhered at a powder outlet.   The apparatus according to claim 12, wherein the powder adhesion preventing member includes one or a plurality of rotors that rotate using rotation of a rotor of the vertical uniaxial eccentric screw pump for powder transfer.   The apparatus of any one of Claims 6-13 provided with the washing | cleaning apparatus for wash | cleaning piping, the pipe | tube used as the flow path of the said liquid, and the pipe | tube used as the flow path of the said powder and liquid mixture. In a method for producing a mixture of powder and liquid,
A mixture of powder and liquid comprising the step of bringing the powder that flows in or drops into contact with the liquid that is discharged in a planar shape so as to form a planar contact surface between the powder and the powder Manufacturing method.   The discharge of the liquid so as to constitute the planar contact surface is performed in a direction inclined at a predetermined angle toward the inflow or fall direction of the powder so as to be oblique to the inflow or fall direction of the powder. 16. The method according to claim 15, wherein the method is carried out so as to form a film or a laminar discharge flow that expands in the same manner and extends in a direction perpendicular to the direction inclined at the angle.   The method according to claim 15 or 16, wherein the powder is dispersed and stably flowed or dropped onto the liquid ejected in the planar shape. A method for producing a mixture of powder and liquid by mixing powder and liquid in-line and continuously producing a mixture of powder and liquid, comprising the following steps: Manufacturing method:
a. A step of allowing a powder to flow in or drop from a powder storage tank by a vertical uniaxial eccentric screw pump for transferring powder;
b. A step of quantitatively discharging the liquid into a planar shape so as to constitute a planar contact surface with the powder; and c. The step of bringing the powder that flows in or drops into contact with the liquid that is discharged in a planar shape so as to form a planar contact surface between the powder and the powder.   The discharge of the liquid so as to constitute the planar contact surface is performed in a direction inclined at a predetermined angle toward the inflow or fall direction of the powder so as to be oblique to the inflow or fall direction of the powder. 19. The method according to claim 18, wherein the method is performed so as to form a film or laminar discharge flow that expands in the same manner and expands in a direction perpendicular to the direction inclined at the angle.   The method according to claim 18 or 19, wherein the powder is dispersed and stably flowed or dropped onto the liquid discharged in a planar shape. Furthermore,
d. The powder and the liquid obtained by bringing the powder and the liquid into contact in the step c are dispersed in the liquid with a high dispersion force using a shearing force. 21. The method according to any one of claims 18 to 20, comprising a step. Furthermore,
e. The method according to claim 21, further comprising a step of returning a dispersion of the powder and the liquid obtained by dispersing the powder in the liquid in the step d to a storage tank that stores the liquid. . Furthermore,
f. The method according to claim 21, comprising a step of mixing the mixture of the powder and the liquid obtained by bringing the powder and the liquid into contact with each other to be more uniform.   The method according to claim 23, wherein the mixture of the powder and the liquid is further uniformly mixed by a static pipe stirrer.   The method according to any one of claims 18 to 24, further comprising a powder adhesion preventing step of scraping off the adhered powder at a powder outlet of the vertical uniaxial eccentric screw pump for powder transport. .   26. The method according to claim 25, wherein the powder adhesion prevention step is performed by rotation of one or a plurality of rotors that rotate using rotation of a rotor of the vertical uniaxial eccentric screw pump for powder transfer.   27. The method according to any one of claims 18 to 26, further comprising a step of cleaning a pipe, a pipe serving as the liquid flow path, and a pipe serving as the flow path of the powder and liquid mixture.

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