JP6048503B2 - Slurry manufacturing apparatus and slurry manufacturing method - Google Patents

Description

  The present invention relates to a slurry manufacturing apparatus and a slurry manufacturing method for manufacturing a slurry by dispersing a substance in a mixture obtained by adding a powdery additive to a slurry or liquid processing raw material.

  Conventionally, as a system for circulating and dispersing a slurry-like or liquid mixture, a system including a dispersing device, a tank, a pump, and piping has been used (see, for example, Japanese Patent Application Laid-Open No. 2011-36862). ).

  In this system or the like, a tank is circulated in a state where a liquid processing raw material is filled, and a powdery additive is gradually added to the processing raw material in the tank to produce a slurry. However, when the powdery additive is lighter than the raw material (the density is small) and floats, the powdery additive may remain on the liquid level in the tank or the stirrer, resulting in a long dispersion time.

  An object of the present invention is to provide a slurry production apparatus and a slurry production method capable of reducing the dispersion time by preventing retention of the additive when a light powdery additive is used.

A slurry production apparatus according to the present invention is a slurry production apparatus for producing a slurry by dispersing a mixture of a slurry-like or liquid treatment raw material and a powdered additive while circulating the treatment raw material or the mixture. A tank capable of storing and capable of supplying the additive to be mixed with the processing raw material; an outlet side connected to the tank; a dispersion device for dispersing the mixture; a pump for circulating the mixture; dispersing device, comprising a pipe for serially connecting said tank and said pump, said additive and said tank for supplying powder supply device, and a processing material supply device for supplying to the tank the process material, wherein Dispersing apparatus, when supplying the additive from the powder supply device, to supply the mixture after dispersion so as to flow through the bottom of the tank, After the supply of the additive from the powder supply device is completed, the mixture is supplied so that the mixture is stored in the tank, and the powder supply device is configured such that the mixture supplied from the dispersing device is a bottom surface of the tank. The additive is fed to the position flowing through .
A slurry production method according to the present invention is a slurry production method for producing a slurry by circulating a mixture of a slurry-like or liquid treatment raw material and a powdery additive while circulating the tank, a dispersion device, and a pump In addition, while circulating the processing raw material or the mixture to a pipe connecting them in series, the additive and the processing raw material to be added are supplied to the processing raw material or mixture in the tank and the mixture is dispersed. A first step, and after the supply of the additive is completed, a second step of supplying the processing raw material to the mixture and dispersing the mixture while circulating the mixture to the tank, a dispersing device, a pump and a pipe. with the door, in the first step, the dispersion apparatus supplies the mixture after dispersion to flow a bottom of said tank, said powder supply de The chair supplies the additive to a position where the mixture supplied from the dispersion device flows through the bottom surface of the tank, and in the second step, the dispersion device stores the mixture after dispersion in the tank. To supply.

  The present invention realizes the production of a slurry by preventing the retention of the additive even when a light powdery additive is used, and shortening the dispersion time.

This application is based on Japanese Patent Application No. 2012-164745 for which it applied on July 25, 2012 in Japan, The content forms one part as content of this application.
The present invention will also be more fully understood from the following detailed description. However, the detailed description and specific examples are preferred embodiments of the present invention and are described for illustrative purposes only. This is because various changes and modifications will be apparent to those skilled in the art from this detailed description.
The applicant does not intend to contribute any of the described embodiments to the public, and the disclosed modifications and alternatives that may not be included in the scope of the claims are equivalent. It is part of the invention under discussion.
In this specification or in the claims, the use of nouns and similar directives should be interpreted to include both the singular and the plural unless specifically stated otherwise or clearly denied by context. The use of any examples or exemplary terms provided herein (eg, “etc.”) is merely intended to facilitate the description of the invention and is not specifically recited in the claims. As long as it does not limit the scope of the present invention.

It is a schematic diagram of the slurry manufacturing apparatus of the embodiment of the present invention. (A) is a figure which shows the state during the powdery additive supply in the manufacturing method using this apparatus. (B) is a figure which shows the state after completion of powdery additive supply in this manufacturing method.

  Hereinafter, a slurry manufacturing apparatus 1 to which the present invention is applied will be described with reference to the drawings. The apparatus 1 described below is for dispersing (also referred to as “slurry”) while circulating a mixture 5 in which a powdery additive 4 is added to a slurry or liquid processing raw material 3. Dispersing means dispersing the substances in the mixture 5, typically the additive 4, that is, mixing so that each substance in the mixture 5 exists uniformly.

  As shown in FIG. 1, the slurry manufacturing apparatus 1 includes a tank 11, a dispersion device 12, a pump 13, a pipe 14, a powder supply device 15, and a processing raw material supply device 16. The slurry production apparatus 1 can also be said to be a circulating dispersion system having a dispersion apparatus 12. The tank 11 can store a slurry-like or liquid treatment raw material or mixture and can supply a powdery additive mixed with the treatment raw material.

  The dispersing device 12 has an outlet side connected to the tank 11 via a pipe 14 to disperse the mixture. The pump 13 circulates the mixture to the tank 11 and the dispersing device 12 through the pipe 14. The pipe 14 connects the dispersing device 12, the tank 11, and the pump 13 in series.

  The powder supply device 15 supplies the additive 4 to the tank 11. The processing raw material supply device 16 supplies the processing raw material 3 to the mixture circulated to the tank 11.

  When the additive is supplied from the powder supply device 15, the process raw material supply device 16 prevents the liquid level of the mixture 5 from being generated in the tank 11 as shown in FIG. 3 is supplied. Here, “the liquid level does not occur” means that the discharge port 11a at the bottom of the tank 11 is filled with the processing raw material 3 or the mixture 5 and a small amount of the mixture 5 is not circulated and stored in the tank 11. It means the state that has been. That is, the “liquid level” means a substantially horizontal liquid level like the liquid level 5a in FIG. 1B described later, and “a liquid level of the mixture 5 does not occur in the tank 11”. “Supplying the processing raw material 3 to the tank” means that the mixture 5 is circulated with such a small amount that the “horizontal liquid level” is not generated in the tank 11. Therefore, the apparatus 1 can reduce the time required for slurry production without the powdery additive remaining on the liquid level of the mixture in the tank 11.

  The powder supply device 15 supplies the additive 4 to the position of the bottom surface of the tank 11 where the mixture 5 from the dispersing device 12 flows. Thereby, the powdery additive 4 is led to the discharge port 11 a along the flow of the mixture 5, led to the dispersing device 12 through the pipe 14, and dispersed. The mixture dispersed by the dispersion device 12 is guided to the tank 11.

  After the supply of the additive from the powder supply device 15 is completed, the processing raw material supply device 16 is configured so that the liquid surface 5a of the mixture 5 is generated in the tank 11 as shown in FIG. Supply. Thus, after the powdery additive 4 is already dispersed with the processing raw material 3 or the mixture 5, the powdery additive 4 becomes powdery on the liquid surface of the mixture in the tank 11 by adding the processing raw material. The retention of the additive can be prevented, and a desired mixing ratio can be realized.

  The processing raw material supply device 16 includes, for example, a nozzle 16a, a processing raw material storage tank 16b, and a pump 16c that supplies the processing raw material in the tank 16b from the nozzle 16a to the tank 11. The pump 16c is provided on a path of a pipe 16d that connects the tank 16b and the nozzle 16a. The amount and timing of the processing raw material supplied from the processing raw material supply device 16 to the tank 11 by the pump 16 c is controlled by the control unit 20.

  By the way, the powder supply device 15 may change the length of the portion inserted into the tank 11. Specifically, the powder supply device 15 is provided with a vertical drive unit 15a. The powder supply device 15 can drive the nozzle 15b up and down by the vertical drive unit 15a. In the state shown in FIG. 1B (second step), the powder supply device 15 has a shorter insertion portion of the nozzle 15b than in the state shown in FIG. 1A (first step). . Thereby, in the powdery additive supply state shown in FIG. 1A, the additive is supplied to the position where the mixture from the dispersing device 12 flows in the bottom surface of the tank 11 without scattering the powder. Further, in the processing raw material supply state after completion of the supply of the powdery additive shown in FIG. 1B, the tip of the nozzle 15b of the powder supply device 15 can be prevented from being immersed in the mixture. When the tip of the nozzle 15b is immersed in the liquid, there is a problem that the mixture adheres to the nozzle 15b and a problem that the powder adheres to the nozzle at the next powder supply.

  The powder supply device 15 includes a hopper 15c that is provided on the nozzle 15b and stores the powder additive. The hopper 15c may be moved up and down together with the nozzle 15b by the vertical drive unit 15a. The powder additive in the hopper 15c is supplied into the tank 11 at a predetermined speed by a screw feeder or the like in the nozzle 15b. The addition of the powder additive is not limited to the screw feeder, and may be, for example, a vibration feeder. In the case of using the vibration feeder, a necessary amount may be put into the hopper 15c. The amount and timing of the powder additive supplied from the powder supply device 15 to the tank 11 are controlled by the control unit 20. The position in the height direction of the powder supply device 15 driven by the vertical drive unit 15 a is also controlled by the control unit 20.

  Moreover, the slurry manufacturing apparatus 1 includes a stirrer 17 that stirs the mixture in the tank 11 in which the liquid level is generated after the supply of the additive is completed. The stirrer 17 is provided with a motor 18 and a vertical drive unit 17a. In the stirrer 17, the blade portion 17 b can be driven up and down by the vertical drive unit 17 a. In the powder additive supply state shown in FIG. 1A, the stirrer 17 may retract the blade portion 17b above the nozzle 15b. By retracting, it is possible to prevent the supply of the powder additive 4 from being hindered. The stirrer 17 exerts its stirring function so that the blade portion 17b is immersed in the liquid in the raw material supply state such as liquid as shown in FIG. The position in the height direction of the blade portion 17b driven by the vertical drive unit 17a is controlled by the control unit 20. The stirrer 17, specifically, the motor 18 is controlled by the control unit 20.

  The piping 14 of the slurry manufacturing apparatus 1 is provided with a pressure sensor (pressure gauge) 21 and a flow rate sensor (flow meter) 22. The pressure sensor 21 is provided in front of the dispersion device 12, for example. The flow sensor 22 is provided, for example, on the outlet side of the pump 13. The detection results of the pressure sensor 21 and the flow sensor 22 are sent to the control unit 20.

  The dispersing device 12 includes a rotor 26 and a stator 27 that is a facing member disposed to face the rotor 26. The mixture is dispersed between the rotor 26 and the stator 27 by passing the mixture in the outer circumferential direction by centrifugal force. The dispersed mixture 5 is returned to the tank 11 through the pipe 14 and the charging nozzle 12a. The dispersing device 12 is provided with an elevating mechanism 28 that adjusts a gap between the rotor 26 and the stator 27. The elevating mechanism 28 can adjust the size of the gap, for example, by driving the rotor 26 up and down. Specifically, in the dispersing device 12, the rotational speed of the rotor 26 is controlled by the control unit 20. The size of the gap by the elevating mechanism 28 is controlled by the control unit 20.

  The dispersing device used for the device 1 is not limited to the dispersing device 12. For example, a rotor may be used instead of the stator. That is, it may be a dispersing device having a pair of rotors that rotate in opposite directions. Further, a static mixer or the like may be used. Here, when a rotor type dispersing device such as the dispersing device 12 is used, it is desirable to assist the liquid feeding function of the pump 13. This is because a rotor-type dispersion device such as the dispersion device 12 discharges the supplied mixture 5 to the outside by centrifugal force while dispersing it. As a result, the pressure in the supply source pipe is lowered, and the liquid feeding function of the pump 13 is assisted by this pressure drop.

  As described above, the slurry production apparatus 1 is an apparatus for producing a slurry by introducing the powder additive 4 to the pump 13 together with the flow of the processing raw material 3 (mixture 5) and sending the mixture 5 to the dispersion apparatus 12. is there. Further, the apparatus uses the minimum processing raw material 3 that can be circulated until the addition of the powder additive 4 is completed, and inputs the remaining processing raw material 3 after the completion of the addition. Specifically, the powder supply device 15 and the processing raw material supply device 16, specifically, the pump 16 c, are controlled by the control unit 20 by controlling the supply amount of the powder additive and the processing raw material to the tank 11. Thus, the liquid level of the mixture is prevented from being generated in 11, thereby realizing an appropriate dispersion treatment that prevents the powder additive from staying.

  As the concentration of the powder additive 4 increases, the viscosity of the slurry (mixture 5) increases, the amount of slurry attached to the inside of the apparatus increases, and the amount of slurry circulated by the pump 13 decreases. In such a case, the processing raw material 3 is added to such an extent that the discharge port 11a of the tank 11 is not filled with the mixture 5. The same process is repeated until the supply of the powder additive 4 is completed. After the entire supply of the powder additive 4 is completed, a slurry is manufactured by supplying the entire remaining amount of the predetermined processing raw material 3 and performing a dispersion process.

  Moreover, the slurry manufacturing apparatus 1 detects the amount which can be circulated in the powder supply stage of Fig.1 (a), and if there exists a shortage, will add a powder additive, adding a processing raw material. For example, based on the detection result of the flow sensor 22, the control unit 20 controls the processing raw material supply device 16 and the powder supply device 15 to supply the predetermined processing raw material 3 and the powder additive 4 to the tank 11. In addition, according to other information, you may adjust the input speed of the additional process raw material 3 and the powder additive 4. FIG. As this information, in addition to the flow rate, the pressure in the pipe 14 (the detection result of the pressure sensor 21) or the remaining amount of the mixture 5 in the tank 11 may be used. The remaining amount of the mixture 5 in the tank 11 may be detected by providing a liquid level sensor using a laser or the like.

  A slurry manufacturing method using the slurry manufacturing apparatus 1 configured as described above will be described. In this slurry production method, a slurry is produced by dispersing a mixture of processing raw materials and additives while circulating them.

  The method includes a first step, a second step, and a third step. In the first step, the slurry or liquid processing raw material 3 is supplied to the tank 11, the dispersing device 12, the pump 13, and the pipe 14 connecting them in series, and the processing raw material 3 or the mixture 5 is circulated. The powdery additive 4 is supplied to the processing raw material 3 or the mixture 5 in the tank 11 and the mixture 5 is dispersed. If necessary, the processing raw material 3 may be additionally supplied. FIG. 1A shows the first step.

  In the second step, after the supply of the additive 4 is completed, the processing raw material 3 is supplied to the mixture 5 while circulating the mixture 5 through the tank 11, the dispersing device 12, the pump 13, and the pipe 14, and the mixture 5 is supplied to the mixture 5. scatter. FIG. 1B shows the state of the second step.

  In the third step, after the supply of the processing raw material 3 in the second step is completed, the mixture 5 is dispersed while circulating the mixture 5 through the tank 11, the dispersing device 12, the pump 13, and the pipe 14. Note that the third step is also in a state having a liquid level in the tank 11 as in FIG.

  In the first step described above, the liquid level of the mixture 5 is not generated in the tank 11. Further, in the first step, the additive is supplied to the position where the mixture 5 from the dispersing device 12 flows in the bottom surface of the tank 11.

  In the first step, for example, each unit is controlled by the control unit 20, and the following procedure is repeated. First, the pump 13 is started (S1-1). Next, the processing raw material 3 is charged to such an extent that the discharge port 11a at the bottom of the tank 11 is filled with the processing raw material 3 and is not stored in the tank 11 (S1-2). Next, the powder additive 4 is charged (S1-3). The processing raw material 3 and the additive 4 are dispersed by the dispersing device 12. Next, it is determined whether or not there is a powder additive 4 for an uncharged amount (S1-4). If there is an uninput powder additive 4, the process returns to S1-2. If there is no powder additive 4 for the uncharged amount, the process proceeds to the second step. In the second step, the processing raw material 3 is charged in an amount that gives a predetermined concentration. That is, the entire remaining amount of the predetermined amount of processing raw material 3 is charged. When the introduction of the processing raw material 3 is completed, the process proceeds to the third step. When repeating the above S1-2 to S1-4, in S1-2, if the minimum processing raw material that can be circulated is sufficient (if the liquid is circulated to such an extent that no liquid level is generated), it is charged. If the mixture circulated due to the increase in viscosity is reduced as described above, it is added.

  In the second step described above, the processing raw material 3 is supplied so that the liquid level 5 a of the mixture 5 is generated in the tank 11. That is, the processing raw material 3 is supplied until the mixture 5 fills the discharge port 11 a and is stored in the tank 11. In the second step, the length of the insertion portion of the powder supply device 15 is made shorter than in the first step. In the second step, the blade portion 17b of the stirrer 17 is lowered. In the second step and the third step, a slurry in which the powder additive is uniformly dispersed is manufactured by stirring the mixture 5 with the stirrer 17 while circulating the mixture 5.

  According to the slurry manufacturing apparatus 1 and the slurry manufacturing method using the same as described above, it is possible to prevent stagnation even when using a light powdery additive, and to manufacture a slurry by shortening the dispersion time. .

The main symbols used in the specification and drawings are listed below.
DESCRIPTION OF SYMBOLS 1 Slurry manufacturing apparatus 3 Processing raw material on slurry form or liquid 4 Powdered additive 5 Mixture 11 Tank 12 Dispersing apparatus 13 Pump 14 Piping 15 Powder supply device 15b Powder supply device nozzle 16 Processing raw material supply device

Claims (6)

A slurry production apparatus for producing a slurry by dispersing a mixture of a slurry-like or liquid treatment raw material and a powdery additive while circulating,
A tank capable of storing the processing raw material or the mixture and capable of supplying the additive mixed with the processing raw material;
A dispersion device having an outlet side connected to the tank and dispersing the mixture;
A pump for circulating the mixture;
Piping for connecting the dispersing device, the tank and the pump in series;
A powder supply device for supplying the additive to the tank;
A processing raw material supply device for supplying the processing raw material to the tank;
The dispersion apparatus supplies the mixture after dispersion so as to flow through the bottom surface of the tank when the additive is supplied from the powder supply device, and supplies the additive from the powder supply device. After completing the above, supply the mixture so that it is stored in the tank,
The powder supply device supplies the additive to a position where the mixture supplied from the dispersing device flows through the bottom surface of the tank .
Slurry manufacturing equipment. The powder supply device has a variable length of a nozzle insertion portion into the tank.
The slurry manufacturing apparatus according to claim 1 . And a stirrer that stirs the mixture in the tank where the liquid level is generated after the supply of the additive is completed.
The slurry manufacturing apparatus according to claim 2 . A slurry production method for producing a slurry by dispersing a mixture of a slurry-like or liquid treatment raw material and a powdery additive while circulating,
The additive and the processing raw material to be added are supplied to the processing raw material or mixture in the tank while circulating the processing raw material or the mixture to a tank, a dispersing device, a pump, and a pipe connecting them in series. And a first step of dispersing the mixture with:
A second step of supplying the processing raw material to the mixture and dispersing the mixture while circulating the mixture to the tank, a dispersion device, a pump, and piping after the supply of the additive is completed;
In the first step, the dispersing device supplies the mixture after dispersion so as to flow through the bottom surface of the tank, and the powder supply device has a position where the mixture supplied from the dispersing device flows through the bottom surface of the tank. Supplying the additive to
In the second step, the dispersing device supplies the mixture after dispersion so that the mixture is stored in the tank.
Slurry manufacturing method. The powder supply device for supplying the additive to the tank has a variable length of a nozzle insertion portion in the tank,
In the second step, the length of the insertion portion of the nozzle is made shorter than in the first step.
The slurry manufacturing method of Claim 4 . A third step of dispersing the mixture while circulating the mixture through the tank, a dispersion device, a pump and a pipe after the supply of the processing raw material in the second step is completed;
The slurry manufacturing method of Claim 5 .

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