JP2020065971A - Cleaning function-added agitation device - Google Patents

Abstract

To provide a cleaning function-added agitation device that allows the cleaning of the inside of the agitation vessel without turning off the motor of the agitator or breaking down the vessel.SOLUTION: Provided is an agitator device 10 comprising a rotation shaft 11 which is installed in a vessel 20 having rotation drive means 23 outside, and which has agitation blades 12 at its lower end part, the agitation blades being caused to rotate by rotation drive force of the rotation drive means 23 to agitate fluid to be agitated inside the vessel 20. The rotation shaft 11 is provided with a scattering part 13 for scattering a cleaning solution by centrifugal force of the rotation shaft 11, the scattering part being preferably made of a funnel-shaped member with the diameter becoming smaller toward the lower end part.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a stirrer with a cleaning function, and in particular, with a stirrer capable of easily removing substances adhering to the inner wall surface of a stirring container equipped with a stirrer such as a mixing tank or reaction tank or the surface of a measuring instrument. Regarding a stirring device.

  In the actual operation of a plant that handles process liquids, various treatments are performed in which liquid or solid additives are mixed with the process liquids to leach target components or form precipitates. . A stirring container equipped with a stirring device is generally used for the treatment of such a process liquid. For example, as described in Patent Document 1, a liquid such as a thermometer, a pH meter, and an ORP meter is used in the stirring container in order to adjust within a range of optimum conditions in various operations such as mixing and precipitate formation. A measuring terminal for immersing in a phase for measurement is generally provided.

  On the other hand, at the research site, in order to search for appropriate mixing conditions and precipitate formation conditions that are the basis of operating conditions in actual operation, the temperature range can be changed variously and the type and amount of additives can be changed. It is being repeatedly tested. Therefore, a stirring container equipped with a stirring device is generally used also in a research site. Even in such a stirring container used in a research site, in order to measure the optimum conditions in various operations such as mixing and precipitate formation, a measuring terminal for immersing in a liquid phase such as a thermometer, a pH meter, and an ORP meter. Is provided.

  In the above stirring container, the liquid scattered by stirring is not immersed in the liquid at the ceiling part of the stirring container, the measuring terminal and the stirring shaft as well as the inner wall exposed to the gas phase portion above the liquid level of the stirring container. If they are left as they are, the quality may vary and accurate test results may not be obtained. Further, in a batch type batch production plant that uses the stirring container, the process liquid handled may differ for each batch process, so to improve yield and prevent contamination. It is desirable to remove and collect the deposits when batch processing is completed.

  When handling the same process liquid each time in a batch system, there is no particular problem if the deposits are almost the same as the process liquid.For example, in the case of a batch process involving mixing of additives, scattering occurs at the beginning of the mixing operation. If the deposits adhere, the deposits may not reach the desired additive concentration when the deposits are mixed in the process liquid of the next batch. Further, in the case of the treatment for producing a precipitate, if the scattered matter is attached at the initial stage of the precipitate producing reaction, and if the attached matter is mixed in the process liquid of the next batch, the next batch is caused by the attached matter. Since the solute concentration in the process liquid is increased, it may not be possible to generate a precipitate under the predetermined precipitate generation reaction conditions.

JP, 2017-159194, A

  As described above, there are cases where batch production using a stirring container for multi-product small quantity production, when searching for suitable conditions at a research site, or when continuously processing process liquids using a stirring container. However, when the process liquid to be handled is changed by switching lots, it is preferable to remove the deposits after the batch processing is completed or when the lots are switched. However, for example, stirring vessels used in research sites are usually smaller in size than those used in actual operations, and it is difficult to remove deposits.In addition, stirring tubes and measuring terminals exist in the gas phase of stirring vessels. Therefore, it has been a problem that it takes a lot of time to remove the deposits on the inner wall surface and the ceiling portion.

  The stirring container used at the research site is generally composed of a cylindrical container having an open upper portion, a lid portion covering the open portion, and a stirrer having a role of stirring the stirred fluid received in the cylindrical container, The lid portion is provided with a plurality of through holes for inserting the stirring shaft of the stirrer and the measuring terminals. The lid portion of this stirring container may be provided with a through hole for introducing a solid additive. Therefore, it is possible to perform cleaning to some extent by inserting the tip of the washing bottle from any of these through holes and spraying washing water.

  However, such cleaning with the cleaning bottle may cause individual differences depending on the worker who performs the cleaning work. In addition, it is preferable to disassemble and wash the agitating container in order to avoid individual differences as much as possible, but in this case, stop the agitator motor and remove these agitators and measuring terminals as necessary. It is necessary to remove the lid part by lifting it up or tilting it, which is extremely troublesome. The present invention has been made in view of the above circumstances, and provides a stirring device with a cleaning function capable of cleaning the inside of a stirring container without having to stop the motor of the stirrer or disassemble the container. The purpose is to

  In order to achieve the above-mentioned object, the stirring device according to the present invention is a stirring device including a rotating shaft having a stirring blade at a lower end thereof, wherein the rotating shaft scatters a cleaning liquid by a centrifugal force of the rotating shaft. Is provided.

  According to the present invention, the inside of the stirring container can be washed without stopping the motor of the stirrer or disassembling the container, so that its industrial value is extremely large.

1 is a vertical cross-sectional view of a stirring container equipped with a stirring device with a cleaning function according to an embodiment of the present invention. It is a perspective view of the stirring device with a cleaning function of FIG. It is a top view of the funnel-shaped member which the stirring device of one example of the present invention has.

  Hereinafter, embodiments of a stirrer with a cleaning function of the present invention and a stirrer equipped with the stirrer will be described in detail with reference to the drawings. As shown in FIG. 1, a stirrer 10 with a cleaning function according to one embodiment of the present invention includes a rotary shaft 11 made of fluororesin, stainless steel, etc., a propeller type turbine provided at a lower end of the rotary shaft 11, and a turbine. And a paddle type stirring blade 12, and is preferably attached to a container 20 having a cylindrical shape. In the container 20, liquids or slurries such as process liquids and research samples are received up to a predetermined liquid level, and various unit operations such as chemical reaction such as leaching and precipitate formation, mixing, and culturing are performed. At that time, the liquid or slurry as the fluid to be stirred is stirred by the stirring device 10.

  The container 20 is composed of, for example, a cylindrical body portion 21 having an open upper portion, and a removable lid portion 22 that closes the open portion of the cylindrical body portion 21. The cylindrical body portion 21 is provided with various nozzles such as a liquid discharge nozzle, a liquid supply nozzle, and an overflow nozzle (not shown), a baffle plate that enhances stirring efficiency, a flexible pipe for adjusting the liquid temperature and a heating medium, and a jacket. There are cases.

  On the other hand, a rotation driving means 23 such as a motor for rotating the stirring device 10 is mounted outside the substantially central portion of the lid portion 22. Since the rotary shaft 11 of the stirring device 10 is connected to the drive shaft of the rotary drive means 23, the lid 22 is provided with a through hole through which the rotary shaft 11 is inserted. Further, the lid portion 22 is also provided with a through hole through which a measuring terminal 24 such as a thermometer, a pH meter, an ORP meter, and a DO meter is inserted. The lid 22 may be further provided with a nozzle or opening for supplying liquid or powder, a sampling nozzle or opening, a handhole for maintenance, and the like.

  When the liquid is received up to a predetermined liquid level in the container 20 having the above structure and the stirring is performed by the rotation of the stirring device 10 by the rotation driving force of the rotation driving means 23, the inner wall surface of the cylindrical body portion 21 Of the portion exposed to the gas phase portion above the liquid level, the lower surface of the lid portion 22, the rotating shaft 11 of the stirrer 10 and the portion exposed to the gas phase portion at the measurement terminal 24 by stirring, The scattered liquid adheres. The height of the liquid level is generally about 20 to 80% of the height of the straight body portion of the cylindrical body portion 21.

  In order to remove the liquid adhering to the inner wall surface or the like and the deposits derived from the liquid with a cleaning liquid, the cleaning liquid is scattered around the rotating shaft 11 of the stirring device 10 by the centrifugal force generated by the rotation of the rotating shaft 11. A scattering unit 13 is provided. The scattering unit 13 is capable of causing a cleaning liquid such as water supplied from the outside of the container 20 to reach at least the inner wall surface of the body portion 21 of the container 20 by the centrifugal force of the rotating shaft 11 of the stirring device 10. If there is no particular limitation as long as it is, it is preferable that it has a shape rotationally symmetric with respect to the rotating shaft 11 so as to maintain stable rotation of the stirring blade 12, and a funnel shape as shown in FIG. It is preferable to have.

  Hereinafter, the funnel-shaped scattering portion 13 shown in FIG. 2 will be specifically described. The scattering portion 13 in FIG. 2 is composed of a funnel portion 13a whose diameter gradually decreases from the upper end portion to the lower end portion, and a cylindrical portion 13b which extends concentrically downward from the lower end portion of the funnel portion 13a, The cylindrical portion 13b is attached to the rotary shaft 11 by fitting it onto the rotary shaft 11. The material of the funnel portion 13a is not particularly limited, but it is preferable that the funnel portion 13a is formed of a corrosion resistant material such as fluororesin or stainless steel. On the other hand, the cylindrical portion 13b may be integrally formed of the same material as the funnel portion 13a, but may be formed of a flexible member so as to be slidably fitted onto the outer peripheral surface of the rotating shaft 11. .

  The scattering portion 13 is preferably fixed to the rotary shaft 11 in the cylindrical portion 13b by screwing, bonding, welding, brazing or the like. Among these fixing methods, it is detachably attached by screwing or the like. It is more preferable because the washing site can be adjusted appropriately. In addition, a seal tape may be wound around a portion of the rotary shaft 11 where the cylindrical portion 13b is fitted, so that the cleaning tape can be detachably fixed and the wash water can be prevented from leaking from the lower end portion of the funnel portion 13a. it can.

  As a method of supplying the cleaning liquid from the outside of the container 20 to the scattering portion 13, a water injector such as a washing bottle is used from a gap between the through hole and the nozzle which are not used, or the through hole of the lid portion 22 for inserting the rotary shaft 11. It suffices to insert the water injection portion of S and directly inject the washing water from the upper opening portion of the funnel portion 13a. When the rotation shaft 11 rotates at a relatively low speed, cleaning water is poured into a portion of the rotation shaft 11 that protrudes above the lid portion 22, and the cleaning water flows down along the outer peripheral surface of the rotation shaft 11. Alternatively, it may be poured into the funnel portion 13a. Alternatively, the cleaning liquid supply pipe connected to the cleaning liquid supply source outside the container 20 may be inserted through the lid portion 22 to extend along the rotary shaft 11, and the cleaning liquid may be supplied from the tip end portion thereof to the funnel portion 13a.

  The height of the funnel portion 13a, the outer diameter of the upper end portion thereof, and the inclination angle of the inclined surface of the funnel portion 13a are determined in consideration of the number of revolutions of the rotary shaft 11, the attachment position of the scattering portion 13, and the like. It is preferable to design so as to reach the farthest portion from the scattering portion 13 in the container 20. In particular, when a plurality of measuring terminals are provided, it is preferable that the cleaning liquid is spattered more vigorously so that the cleaning liquid reaches the portion where the arrival of the cleaning liquid is obstructed by them.

  Generally, the outer diameter of the upper end of the funnel portion 13a is preferably about 1/10 to 1/3 of the inner diameter of the container 20, and more preferably about 1/8 to 1/5. In this case, the outer diameter of the upper end of the funnel portion 13a is preferably twice or more the diameter of the rotating shaft 11, and more preferably 5 times or more. Further, the inclined surface of the funnel portion 13a is preferably inclined by 15 to 60 ° with respect to the rotating shaft 11, and more preferably inclined by 30 °. Further, it is preferable that the upper end portion of the funnel portion and the lower surface of the lid portion 22 are attached so as to be separated by at least 10% of the depth of the funnel portion.

  With this configuration, the adhered matter remains on the inner wall surface of the container 20 and the measurement terminals 24 without stopping the rotation driving means 23 such as a motor and without disassembling the container 20 such as removing the lid 22. Easy parts can be easily washed. When it is feared that the concentration of the process liquid in the container 20 will be diminished due to the mixing of the cleaning liquid, for example, the same liquid as the solvent of the process liquid is used as the cleaning liquid, and the process liquid is mixed in advance so as to correspond to the mixing amount of the cleaning liquid. The concentration should be adjusted to a high level.

  The shape of the inclined surface on the inner side of the funnel portion 13a is not particularly limited, but as shown in FIG. 3 (a), a plurality of groove portions 13c extending radially on the inner wall surface are provided at equal intervals in the circumferential direction. It is preferable to provide the opening. As a result, centrifugal force is easily exerted on the cleaning liquid, and the cleaning liquid can be more vigorously scattered. As shown in FIG. 3B, the plurality of groove portions may be inclined to the rear side in the rotational direction indicated by the arrow with respect to the radial direction. As a result, the cleaning liquid can be scattered more vigorously. The stirring device 10 according to the embodiment of the present invention may be used for cleaning the container 20 in a liquid-free state before or after the treatment. In this case, in addition to the entire inner wall of the container 20, the bottom portion, the stirring blade, etc. The entire inside of the stirring container will be washed.

  As shown in FIG. 1, a cylindrical container 20 provided with a stirring device 10 having a scattering part 13 composed of a funnel part 13a and a cylindrical part 13b is prepared, and the slurry is received inside and stirred by the stirring device 10, The leaching process of the solid content contained in the slurry was performed. Specifically, a 250 mL beaker with an outer diameter of about 70 mm was adopted as the cylindrical body portion 21 of the container 20, and a silicon resin disk was used as the lid portion 22. A first through hole having the smallest hole diameter for inserting the rotary shaft 11 of the stirring device 10 was bored in the center of the disc. Around the first through hole, two second through holes for inserting a thermometer terminal having a larger diameter than the first through hole and an ORP meter terminal for inserting a larger diameter than the second through hole. Two third through holes and two fourth through holes for inserting the pH meter terminal having the largest hole diameter were punched.

  The rotary shaft 11 having four stirring blades 12 at the lower end is inserted into the first through hole from the lower side, and the upper end of the rotary shaft 11 is driven to rotate by a supporting tool provided above the beaker. Connected to the shaft. In addition, a thermometer, an ORP meter and a pH meter were inserted from above into the second through hole to the fourth through hole, respectively, and the depth was set so as to be immersed in the liquid. The funnel portion 13a and the cylindrical portion 13b were integrally formed of fluororesin, and the funnel portion 13a had a height of 24 mm, an outer diameter of the upper end portion of 20 mm, and an inclination angle of 30 ° with respect to the rotating shaft 11 of the inclined surface. As shown in FIG. 3B, the inner surface of the funnel portion 13a is provided with four grooves 13c that are inclined rearward in the rotational direction with respect to the radial direction.

  The cylindrical portion 13b was fitted onto the rotating shaft 11, and the position was adjusted so that the upper end of the funnel portion 13a and the lower surface of the lid portion 22 were separated by 10 mm. At that time, a PTFE sealing tape is wound around the portion of the rotary shaft 11 where the cylindrical portion 13b is fitted to fix the scattering portion 13, and the cleaning liquid in the funnel portion 13a is prevented from easily leaking from the lower end portion. did. The stirring container thus assembled was dipped in a hot water bath maintained at a constant temperature of about 70 ° C. Then, pure water as a liquid sample and Ni-containing material as a solid sample were weighed and placed in the container 20, respectively. Then, while rotating the stirring device 10 at about 650 rpm, sulfuric acid having a concentration of 64% by mass was added as a leaching additive. As a result, the pH was adjusted to 1.5 and the ORP was adjusted to about 100 mV, and the ORP value at the end point was settled at 275 mV, and the temperature was maintained for 10 minutes.

  After the lapse of the holding time of 10 minutes, the washing bottle S is washed from the gap of the first through hole of the lid 22 through which the rotating shaft 11 is inserted while continuing the stirring without stopping the rotation of the motor of the stirring device 10 as the washing operation. When 10 cc of pure water was directly injected into the funnel portion 13a of the spattering section 13 by inserting the tip of the washing water, the washing water was scattered in an instant as soon as the washing water was poured into the washing bottle S, and a total amount was obtained for one leaching process. Even after washing 10 times, the total time was about several seconds. When the inside of the container 20 was visually confirmed after the treatment, the adhered matters adhered to the upper edge portion of the wall surface of the container 20, the lower surface of the lid 22 and the measurement terminals 24 such as a thermometer were satisfactorily washed and removed. It was

  Thereafter, the leachate and the residue treated in the container 20 were collected, and the leachate was analyzed by an ICP-OES apparatus (Agilent 5100SVDV) to find that the Ni concentration was 20 g / L. The Ni quality of No. 2 was 0.25%, and it was confirmed from these data that almost 100% of Ni contained in the sample charged in the container 20 was recovered.

  For comparison, the leaching process was performed in the same manner as above except that the cleaning using the scattering part 13 was not performed. In the cleaning operation, after stopping the motor of the stirring container 10 and moving the motor together with the supporting tool, the lid 22 is lifted to wash the liquid adhering to the upper end portion of the container 20 and the measuring terminal into the washing bottle S. A work of spraying and removing the cleaning water was required, and the required time was about 1 minute. Since washing was performed 10 times in total for one leaching process, a washing time of about 10 minutes was required in total.

  From the above results, it is possible to wash the inner wall of the container without stopping the motor of the stirrer and without removing the lid, by using the stirrer provided with the scattering part satisfying the requirements of the present invention, and especially for washing. It can be seen that the upper end of the inner wall of the container, which is difficult to do, and the back side of the measuring terminals can be reliably washed. It is also found that the cleaning time can be shortened as compared with the conventional disassembly cleaning.

DESCRIPTION OF SYMBOLS 10 Stirrer 11 Rotating shaft 12 Stirring blade 13 Scattering part 13a Funnel part 13b Cylindrical part 13c Groove 20 Container 21 Cylindrical body part 22 Lid part 23 Rotation drive means 24 Measuring terminal S Wash bottle

Claims (6)

  A stirrer comprising a rotating shaft having a stirring blade at a lower end thereof, wherein the rotating shaft is provided with a scattering section for scattering the cleaning liquid by a centrifugal force of the rotating shaft.   The agitating device according to claim 1, wherein the scattering portion is formed of a funnel-shaped member whose diameter is reduced from an upper end portion toward a lower end portion, and is externally fitted to the rotary shaft at the lower end portion.   The stirrer according to claim 2, wherein the funnel-shaped member is provided with a plurality of radially extending groove portions on its inner wall surface at equal intervals in the circumferential direction.   The stirring device according to claim 3, wherein each of the plurality of groove portions is inclined to the rear side in the rotational direction with respect to the radial direction.   5. The container in which the fluid to be stirred is charged and which is provided with rotation driving means on the outside, and the fluid to be stirred is rotated by the rotation driving force of the rotation driving means to stir the fluid to be stirred. An agitating container comprising the agitating device according to claim 1, wherein the scattering portion is located above the liquid level in the container.   The container has a cylindrical shape, and the outer diameter of the upper end of the funnel-shaped member is 1/10 to 1/5 of the inner diameter of the cylindrical container and is twice or more the diameter of the rotating shaft. The stirring container according to claim 5.

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