JP5942629B2 - Solid-liquid separator - Google Patents

Description

  The present invention relates to a solid-liquid separation apparatus that separates solid particles dispersed in a stock solution containing a dispersion medium and solid particles, and the dispersion medium using a density difference.

  As a sedimentation separation apparatus that is one of the solid-liquid separation methods, a configuration in which an inclined plate (a partition plate in an inclined posture) is installed inside a sedimentation tank that contains a stock solution has been proposed (for example, a patent). Reference 1 (FIG. 9), Patent Reference 2 (FIG. 1)). In addition, the said undiluted | stock solution shall contain the solid particle with a density larger than a dispersion medium as a solid particle.

  In the sedimentation / separation apparatus having the above-described configuration, the sedimentation of solid particles is promoted by the so-called boycott effect for each region extending in the oblique direction that is formed by being partitioned by the inclined plate in the sedimentation tank. Therefore, in the entire sedimentation tank provided with the inclined plate, the processing capacity for sedimentation and concentration of the solid particles is supposed to increase.

  Another type of sedimentation separator is a cross flow sedimentation separator. This is provided with a sedimentation tank extending in the lateral direction, and while the stock solution continuously supplied to the sedimentation tank from one end side flows (moves) to the other end side, the solid particles in the stock solution are transferred to the sedimentation tank. It is made to separate from the dispersion medium by settling to the bottom.

  By the way, in the cross-flow type sedimentation separator, the longer the sedimentation distance of the solid particles, the more time is required for sedimentation. Therefore, it is necessary to set a large dimension in the direction in which the stock solution in the sedimentation tank flows.

  Therefore, in the above-described horizontal flow type sedimentation separator, a flat partition plate is installed inside the sedimentation tank in a posture that is inclined horizontally or downstream toward the downstream side in the direction in which the stock solution flows. It is considered. In this way, the sedimentation tank is formed with a plurality of vertically divided sections divided by the partition plate in the upper and lower stages. In each section, solid particles in the stock solution are formed. The settling distance is small. For this reason, it is supposed that the dimension of the direction which flows the undiluted | stock solution of the said sedimentation tank can be reduced.

JP 2005-205396 A JP 2011-25233 A

  However, a conventional settling / separation apparatus having an inclined plate usually causes the solid particles to slide down along the inclination of the upper surface of the inclined plate when the settled solid particles reach the upper surface of the inclined plate. Then, it is made to concentrate at the bottom of the settling tank. However, if the solid particles remain on the upper surface of the inclined plate and become deposited, the solid particles will adhere to the upper surface of the inclined plate, and the concentration efficiency of the solid particles at the bottom of the sedimentation tank may be reduced. A problem arises in that the smooth flow of the undiluted solution is hindered by the narrow flow path in the region partitioned by the plate.

  For this reason, in a sedimentation / separation apparatus equipped with a conventional inclined plate, when the solid particles remain, accumulate, or adhere to the upper surface of each inclined plate, it is necessary to periodically wash each inclined plate.

  In addition, a cross-flow type sedimentation separator of the type having a horizontal partition plate needs to periodically clean the partition plate in order to remove solid particles deposited and adhering to the upper surface of the partition plate.

  Since the washing of the inclined plate and the partition plate as described above needs to be performed after temporarily suspending the undiluted solution by the settling / separation apparatus, there is a problem that labor and operation costs increase when the frequency is high. Therefore, it is desired to reduce the frequency of cleaning the inclined plate and the partition plate provided in the settling tank of the settling separator.

  In addition, as a measure for preventing the deposition and adhesion of solid particles on the upper surface of the inclined plate or partition plate provided in the settling tank, for example, the upper surface of the inclined plate or partition plate is mechanically scraped off. Or by tilting the inclined plate or partition plate, or by moving a surface member such as an endless belt provided in advance on the surface portion of the inclined plate or partition plate. It is conceivable to remove the residues and deposits on the upper surface of the plate by forcibly dropping them. However, when these measures are implemented, a drive source is required, and the configuration of the sedimentation / separation apparatus becomes complicated, resulting in an increase in size.

  Therefore, the present invention provides a method for depositing solid particles on the partition plate when the solid particles in the undiluted solution supplied to the separation container provided with the partition plate are separated using the density difference from the dispersion medium. Thus, an object of the present invention is to provide a solid-liquid separation device that can reduce the frequency of cleaning the partition plate and reduce labor and operation costs by suppressing the adhesion.

In order to solve the above-mentioned problem, the present invention corresponds to claim 1 and includes an inlet for a stock solution containing solid particles having a density difference from the dispersion medium, an outlet for a clarified liquid, and an outlet for solid particles to be concentrated. In the separation container provided, an airfoil partition plate having an airfoil cross section is provided, and the airfoil partition plate is continuously supplied to the inside of the separation container from the inlet of the stock solution to the outlet of the clarified liquid. In the liquid flow of the undiluted solution formed in the separation container during the flow, installed so that the leading edge and the trailing edge of the airfoil partition plate are located on the upstream side and the downstream side in the direction of the flow, and The airfoil partition plate is accelerated more than the liquid flow of the stock solution until reaching the airfoil partition plate on the side facing the direction in which the solid particles move in the stock solution based on the density difference with the dispersion medium. A solid-liquid separator having a configuration in which the flow is formed.

  In the above configuration, the airfoil partition plate has an airfoil cross section of a symmetric wing, and the airfoil partition plate is disposed inside the separation container with respect to the liquid flow of the stock solution formed in the separation container. The solid particles are attached in a posture with an angle of attack inclined to the upstream side in the direction of movement in the stock solution based on the density difference with the dispersion medium.

  Similarly, in the above configuration, the airfoil partition plate has an airfoil cross section of an asymmetric blade, and the airfoil partition plate is disposed on the side where the camber of the airfoil cross section of the asymmetric blade is provided. The surface is attached in such a posture that the solid particles are on the upstream side in the direction of movement in the stock solution based on the density difference with the dispersion medium.

  In each of the above-described configurations, the separation container is configured as a sedimentation tank having a stock solution inlet on one end side, a clear solution outlet on the other end, and a solid particle outlet to be concentrated on the bottom. And

  Similarly, in each of the above-described configurations, the separation vessel is provided with a raw liquid inlet at one end side, a clarified liquid outlet at the lower end of the other end side, and a solid particle outlet to be concentrated at the top. The configuration is as follows.

  Similarly, in each of the above-described configurations, the separation container is a cylinder that can be rotationally driven, which is provided with an inlet for the raw solution at one end in the axial direction and an outlet for the clarified liquid and an outlet for the solid particles to be concentrated at the other end. And a blade-type partition plate having a blade-shaped cross section is provided inside the centrifugal container.

According to the solid-liquid separation device of the present invention, the following excellent effects are exhibited.
(1) In the airfoil partition plate provided in the separation container, the solid particles are formed in the stock solution by the accelerated liquid flow formed on the side facing the direction in which the solid particles move in the stock solution based on the density difference with the dispersion medium. The solid particles that move to reach the vicinity of the airfoil partition plate can be smoothly fed to the trailing edge side. For this reason, the said wing | blade type | mold partition plate can suppress that the said solid particle remains and adheres. (2) Therefore, the airfoil partition plate can reduce the frequency of cleaning and can reduce labor.
(3) Since continuous solid-liquid separation processing of the stock solution can be continued for a long period of time, the operation cost can be reduced.

It is a general | schematic cutting side view which shows an example made into the sedimentation separator as one Embodiment of the solid-liquid separator of this invention. The other example made into the sedimentation-separation apparatus as other form of implementation of this invention is shown, (a) is a general | schematic cutting side view, (b) is a schematic cutting | disconnection top view. It is a general | schematic cutting side view which shows the example made into the floating separation apparatus as other form of implementation of this invention. It is a schematic sectional drawing which shows the example made into the centrifuge as another form of implementation of this invention. It is a figure corresponding to FIG. 1 which shows the other example of an airfoil partition plate as another form of implementation of this invention.

  Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings.

  FIG. 1 shows a configuration example in the case of a sedimentation separator as an embodiment of the solid-liquid separator of the present invention.

  That is, the settling separation apparatus includes a settling tank 2 as a separation container for containing a dispersion medium and a stock solution 7 containing solid particles having a density higher than that of the dispersion medium, as indicated by reference numeral 1 in FIG.

  The sedimentation tank 2 is provided with an inlet 3 for the stock solution 7 at the lower part on one end side in the horizontal direction, and an outlet 4 for the clarified liquid 8 at the upper part on the other end side, and at the bottom on the other end side in the horizontal direction. The solid particle to be settled and separated is provided with a concentrated particle outlet 5 for taking out as a slurry-like particle concentrate 9.

  Further, an airfoil partition plate 6 having a wing-shaped cross section is formed inside the settling tank 2, and an arrow formed in the settling tank 2 when the stock solution 7 is continuously supplied from the stock solution inlet 3. The airfoil partition plate 6 is installed in a horizontal direction so as to cross the liquid flow as indicated by a, and the airfoil partition plate 6 is inclined so that the downstream side is lower than the upstream side in the flow direction of the stock solution 7. In FIG. 1, for convenience of explanation, the airfoil partition plate 6 is shown in a configuration in which the airfoil partition plate 6 is arranged in two stages in the upper and lower stages.

  As shown in FIG. 1, the airfoil partition plates 6 installed inside the settling tank 2 are inclined so that the downstream side has a downward slope with respect to the arrow a, so that the solid particles are dispersed. On the surface side that is the upstream side of the settling direction (indicated by arrow x) that is the direction of movement in the stock solution 7 based on the density difference with the medium, that is, on the upper surface side of each airfoil partition plate 6, the arrow a A liquid flow (indicated by an arrow a1) accelerated than the liquid flow shown in FIG.

  Specifically, as shown in FIG. 1, when the cross-sectional shape of each airfoil partition plate 6 is a symmetrical blade, each airfoil partition plate 6 faces upward with respect to the liquid flow indicated by the arrow a. Is installed in the settling tank 2 at an angle posture having an angle of attack θ of the above, thereby forming the accelerated liquid flow (arrow a1) on the upper surface side of each airfoil partition plate 6. It is made to be able to.

  The sedimentation tank 2 has a length dimension that allows the solid particles to sufficiently settle while the stock solution 7 supplied from the stock solution inlet 3 flows through the sedimentation tank 2 to the clarification liquid outlet 4. Shall be provided.

  In addition, the airfoil, the size, and the angle of attack θ of the cross-sectional shape of each airfoil partition plate 6 are set so that no flow separation occurs in the liquid flow indicated by the arrow a. And

  When solid-liquid separation is performed using the sedimentation separator according to the present embodiment having the above-described configuration, the stock solution 7 is continuously supplied from the stock solution inlet 3 to the sedimentation tank 2.

  The undiluted solution 7 supplied into the settling tank 2 becomes a dispersed liquid flow (arrow a) toward the clarified liquid outlet 4, and the solid contained in the undiluted solution 7 during this period. The particles gradually settle toward the bottom of the settling tank 2 or the top surface of each airfoil partition plate 6 based on the density difference from the dispersion medium.

  At this time, since the airfoil partition plate 6 is provided in a multistage manner in the settling tank 2, the height dimension is limited in each region partitioned by the airfoil partition plate 6. As a result, the settling distance of the solid particles in the stock solution becomes small, so that the settling of the solid particles can be performed efficiently.

  In addition, since each of the airfoil dividers 6 is installed with an inclination at the upward angle of attack θ, each region formed by the airfoil dividers 6 extends in an oblique direction. It becomes. For this reason, in each said area | region, the sedimentation of a solid particle is accelerated | stimulated by the said so-called boycott effect.

  Further, in each of the airfoil dividers 6, the liquid pressure (static pressure) in the vicinity of the upper surface in the liquid flow (arrow a) is lower than the surroundings. For this reason, due to the static pressure difference between the vicinity of the upper surface of each airfoil partition plate 6 and the surroundings, liquid flowing toward the upper surface of each airfoil partition plate 6 is present on the upper side of each airfoil partition plate 6. A flow starts to occur. For this reason, in the stock solution 7 that passes above the airfoil partition plate 6, the solid particles in the stock solution 7 are caused to flow into the airfoil partition plate 6 by the flow of liquid toward the upper surface of the airfoil partition plate 6. Since the speed of sedimentation toward the upper surface of the liquid becomes higher, the processing capacity for solid-liquid separation can be improved.

  Since the liquid flow (arrow a1) accelerated from the liquid flow shown by the arrow a is generated on the upper surface side of each airfoil partition plate 6 in the settling tank 2, the solid particles to settle are generated. Among them, the one that has reached the vicinity of the upper surface of each airfoil partition plate 6 is put on the accelerated liquid flow (arrow a1) and smoothly sent to the trailing edge side of each airfoil partition plate 6. . Thereby, in each said wing | wing type | mold partition plate 6, the residue of the said solid particle on an upper surface side comes to be suppressed. Therefore, the sedimentation / separation apparatus 1 according to the present embodiment can reduce the frequency of cleaning the airfoil partition plates 6 and can reduce labor.

  After that, the solid particles transported by the accelerated liquid flow (arrow a1) pass through the rear edge of each airfoil partition plate 6 so as to further settle toward the lower side of each airfoil partition plate 6. become.

  As described above, in the sedimentation tank 2, the solid particles contained in the stock solution 7 are settled to the bottom of the sedimentation tank 2 and concentrated. Therefore, in the sedimentation tank 2, the clarified liquid 8 after the solid particles are settled and separated is continuously extracted from the clarified liquid outlet 4.

  On the other hand, the slurry-like particle concentrate 9 formed by the solid particles settled at the bottom of the settling tank 2 may be continuously or intermittently extracted from the concentrated particle outlet 5 and recovered.

  Thus, according to the sedimentation / separation apparatus 1 of the present embodiment, the sedimentation / separation process of the solid particles contained in the stock solution 7 can be performed efficiently.

  Moreover, in the sedimentation / separation apparatus 1 of the present embodiment, the continuous sedimentation / separation process of the stock solution 7 can be continued for a long period of time, so that the operating cost can be reduced.

  Next, FIGS. 2A and 2B show another configuration example of a sedimentation separator as a solid-liquid separator as another embodiment of the present invention.

  That is, the sedimentation separator according to the present embodiment includes a rectangular tube-shaped sedimentation tank 11 that extends obliquely in the vertical direction, as indicated by reference numeral 10 in FIGS.

  The sedimentation tank 11 is provided with a stock solution inlet 3 for supplying a stock solution 7 similar to that shown in FIG. 1 and a clear solution 8 outlet 4 at the upper diagonal position.

  The bottom portion of the settling tank 11 has a hopper shape, and a concentrated particle outlet 5 is provided at the lower end thereof.

  Inside the settling tank 11, an airfoil partition plate 12 having a cross-sectional airfoil shape is disposed so as to extend obliquely in the vertical direction corresponding to the inclination of the settling tank 11 and continuously from the stock solution inlet 3. 7 is provided so as to cross the liquid flow as indicated by an arrow b formed in the settling tank 11. 2A and 2B show a configuration in which, for example, four airfoil partition plates 12 are arranged in the settling tank 11.

  Each of the airfoil partition plates 12 disposed in an inclined manner in the settling tank 11 has a settling direction x1 in which the solid particles move in the stock solution 7 based on the density difference from the dispersion medium (see FIG. 2B). A liquid flow (indicated by an arrow b1) accelerated from the liquid flow indicated by the arrow b on the surface side which is the upstream side of the vertical rear side), that is, the upper surface side of each airfoil partition plate 12 The posture is such that it can be formed.

  Specifically, as shown in FIG. 2B, each blade-type partition plate 12 whose cross-sectional shape is a symmetrical blade has an angle of attack θ1 that is upward with respect to the liquid flow indicated by the arrow b. It is installed in the settling tank 11 in a posture.

  In addition, the airfoil, the size, and the angle of attack θ1 of the cross-sectional shape of each airfoil partition plate 12 are set so that no flow separation occurs in the liquid flow indicated by the arrow b. And

  In addition, the same components as those shown in FIG.

  When solid-liquid separation is performed using the sedimentation separator according to the present embodiment having the above-described configuration, the stock solution 7 is continuously supplied from the stock solution inlet 3 to the sedimentation tank 11.

  The stock solution 7 supplied into the sedimentation tank 11 becomes a dispersed liquid flow (arrow b) toward the clarified liquid outlet 4, and the solid contained in the stock solution 7 during this period. The particles gradually settle toward the bottom of the settling tank 11 or the top surface of each airfoil partition plate 12 based on the density difference from the dispersion medium.

  At this time, since each of the airfoil partition plates 12 is inclined and installed in the settling tank 11, the airfoil partition plates 12 are obliquely formed by being partitioned by the airfoil partition plates 12 in the settling tank 11. In the extended region, the soaking of the solid particles is promoted by the so-called boycott effect.

  Further, each airfoil partition plate 12 has a lower liquid pressure (static pressure) near the upper surface in the liquid flow (arrow b) than the surroundings. On the upper side, a liquid flow toward the upper surface of each airfoil partition plate 12 is generated. For this reason, the liquid flow toward the upper surface of each airfoil partition plate 12 increases the speed at which the solid particles in the stock solution 7 settle toward the upper surface of each airfoil partition plate 12. The separation processing capacity can be improved.

  Since the liquid flow (arrow b1) accelerated from the liquid flow indicated by the arrow b is generated on the upper surface side of each airfoil partition plate 12, among the solid particles that settle, What has reached the vicinity of the upper surface of each airfoil partition plate 12 is put on the accelerated liquid flow (arrow b1) and smoothly sent to the trailing edge side of each airfoil partition plate 12. For this reason, in each of the airfoil dividers 12, the solid particles remain on the upper surface side.

  Thereafter, the solid particles conveyed by the accelerated liquid flow (arrow b1) pass further toward the bottom of the settling tank 11 after passing through the rear edge of each airfoil partition plate 12.

  Therefore, in the sedimentation separator 10 of the present embodiment, as in the sedimentation separator 1 shown in FIG. 1, the solid particles in the stock solution 7 are settled to the bottom of the sedimentation tank 11 and concentrated. Become. For this reason, in the sedimentation tank 11, the clarified liquid 8 after the solid particles are settled and separated is continuously extracted from the clarified liquid outlet 4. On the other hand, the slurry-like particle concentrate 9 formed at the bottom of the settling tank 11 may be continuously or intermittently extracted from the concentrated particle outlet 5 and recovered.

  Thus, according to the sedimentation / separation apparatus 10 of the present embodiment, the sedimentation / separation processing of the solid particles contained in the stock solution 7 can be efficiently performed.

  Furthermore, since the sedimentation separation apparatus 10 of the present embodiment can form an accelerated liquid flow (arrow b1) on the upper surface side of each airfoil partition plate 12 during the sedimentation separation process, FIG. The same effect as in the embodiment can be obtained.

  Next, FIG. 3 shows a configuration example of a floating separation device as a solid-liquid separation device as still another embodiment of the present invention. The floating separation is preferably used when the density of the solid particles is smaller than the density of the liquid. In addition, levitation separation may be performed by using bubbles to make solid particles adhere to the bubbles and float.

  The above-described levitation separator is denoted by reference numeral 13 in FIG. 3 and generally includes a configuration corresponding to a configuration in which the sedimentation separator 1 illustrated in FIG. 1 is turned upside down.

  That is, the levitation separation apparatus 13 of the present embodiment includes a levitation tank 14 as a separation container for housing a dispersion medium and a stock solution 19 containing solid particles having a density lower than that of the dispersion medium.

  The levitation tank 14 is provided with an inlet 15 for the stock solution 19 at the upper part on one end side in the horizontal direction, and an outlet 16 for the clarified liquid 20 at the lower part on the other end side, and at the top on the other end side in the horizontal direction. The solid particles separated from the surface are provided with a concentrated particle outlet 17 for taking out the solid particles as a slurry-like particle concentrate 21.

  Further, an airfoil partition plate 18 having a wing-shaped cross section is formed inside the levitation tank 14 and an arrow formed in the levitation tank 14 when the stock solution 19 is continuously supplied from the stock solution inlet 15. It is installed in the horizontal direction so as to cross the liquid flow as indicated by c, and is inclined so that the downstream side is higher than the upstream side of the liquid flow. FIG. 3 shows a configuration in which, for example, the airfoil partition plates 18 are arranged in multiple stages in the levitation tank 14.

  Each of the wing-shaped partition plates 18 installed inside the levitation tank 14 includes an upstream side in the levitation direction (indicated by an arrow y) in which the solid particles move in the stock solution 19 based on a density difference from the dispersion medium. The posture is such that a liquid flow (indicated by the arrow c1) accelerated than the liquid flow indicated by the arrow c can be formed on the surface side, that is, the lower surface side of each airfoil partition plate 18.

  Specifically, as shown in FIG. 3, each airfoil partition plate 18 having a symmetric wing in cross-sectional shape is lifted in an angle posture with a downward angle of attack θ2 with respect to the liquid flow indicated by the arrow c. It is installed in the tank 14.

  The levitation tank 14 has a length dimension that allows the solid particles to sufficiently float while the undiluted liquid 19 supplied from the undiluted liquid inlet 15 flows through the levitation tank 14 to the clarified liquid outlet 16. Shall be provided.

  In addition, the airfoil, size, and angle of attack θ2 of the cross-sectional shape of each airfoil partition plate 18 are set so that no flow separation occurs in the liquid flow indicated by the arrow c. And

  When solid-liquid separation is performed using the flotation separation apparatus of the present embodiment having the above-described configuration, the stock solution 19 is continuously supplied from the stock solution inlet 15 to the flotation tank 14.

  The stock solution 19 supplied into the levitation tank 14 becomes a dispersed liquid flow (arrow c) toward the clarified liquid outlet 16, and during this time, the solid contained in the stock solution 19 The particles gradually float toward the ceiling of the levitation tank 14 or the lower surface of each airfoil partition plate 18 based on the density difference with the dispersion medium.

  At this time, since the airfoil partition plates 18 are provided in multiple stages in the levitation tank 14, the height dimension is limited in each region partitioned by the airfoil partition plates 18. As a result, the floating distance of the solid particles in the stock solution is reduced, and therefore, the solid particles are efficiently levitated.

  In addition, since each of the airfoil partition plates 18 is installed with an inclination at the downward angle of attack θ2, each region formed by partitioning with each of the airfoil partition plates 18 extends in an oblique direction. It becomes. For this reason, in each of the above regions, the floating based on the density difference between the solid particles and the dispersion medium is promoted by the same separation promoting effect as the above-described boycott effect in the sedimentation separation.

  Further, each airfoil partition plate 18 has a lower liquid pressure (static pressure) near the upper surface in the liquid flow (arrow c) than the surroundings. On the lower side, a liquid flow toward the lower surface of each airfoil partition plate 18 is generated. For this reason, the liquid flow toward the lower surface of each of the airfoil partition plates 18 increases the speed at which the solid particles in the stock solution 19 float toward the lower surface of the airfoil partition plate 18. The processing capability is improved.

  Since a liquid flow (arrow c1) accelerated from the liquid flow indicated by the arrow c is generated on the lower surface side of each airfoil partition plate 18 in the levitation tank 14, each airfoil partition plate 18 is provided. The remaining of the solid particles on the lower surface side is suppressed. Therefore, the levitating / separating apparatus 13 according to the present embodiment can reduce the frequency of cleaning the airfoil partition plates 18 and can reduce labor.

  The solid particles transported by the accelerated liquid flow (arrow c1) will float toward the top of the levitation tank 14 after passing through the rear edge of each airfoil partition plate 18.

  As described above, in the levitation tank 14, the solid particles contained in the stock solution 19 are levitated to the top of the levitation tank 14 and concentrated. Thereby, in the said levitation tank 14, the clarified liquid 20 after the floating separation of the said solid particle is performed from the said clarified liquid exit 16 comes to be taken out continuously.

  On the other hand, the slurry-like particle concentrate 21 formed by the solid particles that have floated up to the top of the levitation tank 14 may be withdrawn and collected continuously or intermittently from the concentrated particle outlet 17.

  Thus, according to the flotation separation apparatus 13 of the present embodiment, the flotation separation process of the solid particles contained in the stock solution 19 can be performed efficiently.

  In addition, the levitation separation device 13 of the present embodiment can continue the continuous levitation separation process of the stock solution 19 for a long period of time, so that the operating cost can be reduced.

  FIG. 4 shows, as still another embodiment of the present invention, a configuration example of a centrifugal separator as a solid-liquid separator that uses the same stock solution 7 as that shown in FIG. Centrifugation is used for solid-liquid separation of a slurry (solid-liquid suspension), and is particularly preferably used when a force larger than gravity (here, centrifugal force) is required.

  That is, the centrifugal separator according to the present embodiment is configured to be rotationally driven by a rotational driving device (not shown) around the axis O as a separation container for storing the stock solution 7 as indicated by reference numeral 22 in FIG. A cylindrical centrifuge container 23 is provided.

  The centrifuge container 23 is provided with a stock solution inlet 24 for supplying the stock solution 7 at one end in the axial direction. At the other end of the centrifuge vessel 23 in the axial direction, an outlet 25 for the clarified liquid 8 is provided near the center, and concentrated on the outer periphery of the centrifuge vessel 23 by centrifugation. The concentrated particle outlet 26 for taking out the solid particles to be taken out as the slurry-like particle concentrate 9 is provided.

  Furthermore, the stock solution 7 is continuously supplied from the stock solution inlet 24 to the inside of the centrifuge container 23 by a blade-type partition plate 27 having a substantially cylindrical shape and a sectional shape of the peripheral wall as a blade shape. Is provided so as to cross the liquid flow as indicated by the arrow d formed in the centrifugal container 23.

  The airfoil partition plate 27 has a radially outward movement direction (arrow) in which solid particles move in the stock solution 7 based on a density difference from the dispersion medium under a centrifugal force acting by the rotation of the centrifugal container 23. The liquid flow (indicated by the arrow d1) accelerated from the liquid flow indicated by the arrow d on the upstream surface side of the airfoil partition plate 27 (indicated by z), that is, on the inner peripheral surface side when the airfoil partition plate 27 rotates. ) Is formed so that the cross-sectional shape of the peripheral wall is set.

  Specifically, as shown in FIG. 4, when the cross-sectional shape of the peripheral wall of the airfoil partition plate 27 is an airfoil of a symmetric airfoil, the airfoil cross section corresponds to the liquid flow indicated by the arrow d. It is formed so as to have an angle posture inclined toward the axis O side at an angle of attack θ3.

  The airfoil partition plate 27 is connected to the centrifuge container 23 via a connecting member (not shown) and rotates integrally with the centrifuge container 23. In the centrifuge device 22 of the present embodiment, the stock solution 7 supplied into the centrifuge container 23 rotates together with the centrifuge container 23 so that a centrifugal force acts. In view of this point, it is desirable that the airfoil partition plate 27 rotates integrally with the centrifuge container 23 as described above, but sufficient centrifugal force is applied to the stock solution 7 by the rotation of the centrifuge container 23. If it is possible to act, the airfoil partition plate 27 may be held by a fixing member (not rotating) (not shown) inserted from the outside inside the centrifugal container 23.

  The airfoil having a cross-sectional shape of the airfoil partition plate 27, the size, and the angle of attack θ3 are set so that no separation of the flow occurs in the liquid flow indicated by the arrow d. To do.

  When solid-liquid separation is performed using the centrifuge device 22 of the present embodiment having the above-described configuration, the centrifuge container 23 is rotationally driven by a rotation driving device (not shown), and in this state, the stock solution 7 Is continuously supplied to the centrifuge container 23 from the stock solution inlet 24.

  The stock solution 7 supplied into the centrifuge container 23 becomes a dispersed liquid flow (arrow d) toward the clarified liquid outlet 25, and during this time, the stock solution 7 contained in the stock solution 7 is used. Under the action of the centrifugal force, the solid particles are radially outward toward the inner peripheral surface of the centrifuge container 23 or the inner peripheral surface of the airfoil partition plate 27 based on the density difference with the dispersion medium. Moves (sinks) in the direction.

  Further, the airfoil partition plate 27 has a lower liquid pressure (static pressure) in the vicinity of the inner peripheral surface in the liquid flow (arrow d). On the inner peripheral side, a liquid flow toward the inner peripheral surface of the airfoil partition plate 27 is generated. Therefore, the flow of the liquid toward the inner peripheral surface of the airfoil partition plate 27 increases the speed at which the solid particles in the stock solution 7 move toward the inner peripheral surface of the airfoil partition plate 27. The processing capability for liquid separation can be improved.

  At this time, a liquid flow (arrow d1) accelerated than the liquid flow indicated by the arrow d is generated on the inner peripheral surface side of the airfoil partition plate 27. Of the solid particles moving to the vicinity of the inner peripheral surface of the airfoil partition plate 27 are put on the accelerated liquid flow (arrow d1) and smoothly moved to the rear edge side of the airfoil partition plate 27. Will be sent to. Therefore, in the airfoil partition plate 27, the solid particles remain on the inner peripheral surface side. Therefore, the centrifugal separator 22 according to the present embodiment can reduce the frequency of cleaning the wing-shaped partition plate 27 and can reduce labor.

  The solid particles conveyed by the accelerated liquid flow (arrow d 1) further move toward the inner peripheral surface of the centrifuge container 23 after passing through the rear edge of the airfoil partition plate 27.

  As described above, in the centrifuge container 23, the solid particles contained in the stock solution 7 are moved to the inner peripheral surface of the centrifuge container 23 and concentrated. Therefore, in the centrifuge container 23, the clarified liquid 8 after the solid particles are centrifuged is continuously taken out from the clarified liquid outlet 25.

  On the other hand, the slurry-like particle concentrate 9 formed by the solid particles moved to the inner peripheral surface of the centrifuge container 23 is continuously or intermittently extracted from the concentrated particle outlet 26 and collected. That's fine.

  Thus, according to the centrifugal separator 22 of the present embodiment, it is possible to efficiently perform the centrifugal separation process of the solid particles contained in the stock solution 7.

  Moreover, since the centrifugal separator 22 of the present embodiment can continue the continuous centrifugal treatment of the stock solution 7 for a long period of time, it is possible to reduce the operating cost.

  4 shows an example of the configuration of the centrifugal separator 22 for treating the stock solution 7 containing solid particles having a density higher than that of the dispersion medium, the solid-liquid separator of the present invention is shown in FIG. Similarly to the stock solution 19, the stock solution 19 containing solid particles having a density lower than that of the dispersion medium may be applied to a centrifuge for processing.

  In such a centrifugal separator, the direction in which the solid particles in the stock solution 19 move based on the density difference from the dispersion medium when the centrifugal force is applied is radially inward. For this reason, the centrifugal separator has a configuration similar to that shown in FIG. 4 so that an accelerated liquid flow is formed on the outer peripheral surface side of the cylindrical blade-shaped partition plate provided in the centrifugal vessel 23. In addition, the airfoil cross section may be configured to have an angle posture inclined at a certain angle of attack toward the outer peripheral side. The centrifuge container 23 may have a configuration in which an outlet 25 for the clarified liquid 8 is provided on the outer peripheral portion of the other end in the axial direction, and a concentrated particle outlet 26 is provided near the center.

  Further, the present invention is not limited to the above embodiment, and the airfoil partition plates 6, 12, 18 and 27 are shown as having a wing shape having a symmetric wing shape in cross section. As shown, the airfoil partition plate 28 may have a cross-sectional shape of an asymmetric airfoil airfoil. When this type of airfoil partition plate 28 is employed, the surface 28a on the side where the camber is provided in the airfoil of an asymmetrical blade moves the solid particles in the stock solutions 7 and 19 based on the density difference with the dispersion medium. The flow may be accelerated on the surface 28a on the side where the camber is provided.

  That is, the surface 28a on the side where the camber of the airfoil partition plate 28 is provided may be positioned on the upper surface side in the case of the sedimentation separator shown in FIG. 5, and the lower surface in the case of the levitation separator. In the case of the centrifugal separator of the stock solution 7 containing solid particles having a density higher than that of the dispersion medium, the peripheral surface side in the case of the centrifugal separator of the stock solution 19 containing solid particles having a density lower than that of the dispersion medium. It is sufficient to position them respectively.

  Further, since the airfoil partition plate 28 has an airfoil cross section provided with a camber, the liquid flow of the stock solutions 7 and 19 formed inside the sedimentation tanks 2 and 11, the floating tank 14, and the centrifuge container 23 (see FIG. 5, the liquid flow (arrow a)) of the stock solution 7 formed inside the sedimentation tank 2 may be provided not only in an angle posture with an angle of attack but also in an angle posture without an angle of attack. In FIG. 5, the same components as those shown in FIG.

  In the embodiment of FIG. 1, the embodiment of FIGS. 2 (a) and 2 (b), and the embodiment of FIG. 5, the number of airfoil partition plates 6, 12, 28 provided in the settling tanks 2, 11 The arrangement interval includes the size and shape of the sedimentation tanks 2 and 11, the flow rate of the stock solution 7 in the sedimentation tanks 2 and 11, the density difference between the solid particles in the stock solution 7 and the dispersion medium, and the airfoil partition plates 6 and 12 , 28 may be changed to other numbers or arrangement intervals than shown in the figure.

  Similarly, in the embodiment of FIG. 3, the number and arrangement interval of the airfoil partition plates 18 provided in the levitation tank 14 are the size and shape of the levitation tank 14, the flow rate of the stock solution 19 in the levitation tank 14, Depending on the density difference of the solid particles in the stock solution 19 from the dispersion medium, the size of the airfoil partition plate 18, etc., the number or arrangement interval other than those illustrated may be changed.

  Furthermore, in the embodiment shown in FIG. 4, a plurality of airfoil partition plates 27 may be provided in the centrifuge container 23 so as to be arranged in the radial direction or the axial direction. In that case, the arrangement interval of the airfoil partition plates 27 is the size and shape of the centrifuge container 23, the flow rate of the stock solution 7 in the centrifuge vessel 23, and the density difference from the dispersion medium of the solid particles in the stock solution 7. What is necessary is just to set suitably according to the size of the wing | blade type partition plate 27, etc. FIG.

  Of course, various changes can be made without departing from the scope of the present invention.

1 Sedimentation separator (solid-liquid separator)
2 Settling tank (separation vessel)
3 Stock solution inlet 4 Clarified liquid outlet 5 Concentrated particle outlet 6 Airfoil partition plate 7 Stock solution 8 Clarified liquid 10 Sedimentation separator (solid-liquid separator)
11 Settling tank (separation vessel)
12 Airfoil partition plate 13 Floating separator (solid-liquid separator)
14 Floating tank (separation container)
15 Stock solution inlet 16 Clarified liquid outlet 17 Concentrated particle outlet 18 Airfoil partition plate 19 Stock solution 20 Clarified liquid 22 Centrifugal separator (solid-liquid separator)
23 Centrifuge container (separation container)
24 Stock solution inlet 25 Clarified liquid outlet 26 Concentrated particle outlet 27 Airfoil divider 28 Airfoil divider θ, θ1, θ2, θ3 Angle of attack

Claims (6)

In a separation container provided with an inlet of a stock solution containing solid particles having a density difference from the dispersion medium, an outlet of a clarified liquid, and an outlet of solid particles to be concentrated, an airfoil partition plate having an airfoil cross section is provided.
The airfoil partition plate, inside said separation vessel, in the liquid flow of stock solution is continuously supplied from the inlet of the stock solution is formed into the separation vessel while flowing to the outlet of said clarified liquid, The airfoil partition plate is installed so that the leading edge and the rear edge of the airfoil partition plate are positioned on the upstream side and the downstream side in the flow direction, and the airfoil partition plate is based on the density difference between the solid particles and the dispersion medium. The solid liquid is characterized in that it has a posture in which a flow accelerated from the liquid flow of the stock solution up to the airfoil partition plate is formed on the side facing the moving direction in the stock solution. Separation device. The airfoil partition plate, and having a blade-shaped cross section of the symmetrical blade, inside said separation vessel, the airfoil partition plate, to the liquid flow of the stock solution formed in the separation vessel, the solid solid-liquid separator of the density difference claim 1 wherein to attach in a posture with the elevation angle inclined to the upstream side of the direction of movement in stock based on the particle dispersion medium. The airfoil partition plate, and having a blade-shaped cross section of the asymmetric wing, inside said separation vessel, the airfoil partition plate, the surface on the side where the camber of the airfoil section of an asymmetric blade is provided is the 2. The solid-liquid separator according to claim 1, wherein the solid particles are attached in an attitude that is upstream of a direction in which the solid particles move in the stock solution based on a density difference with the dispersion medium. The separation container, an inlet of the stock solution at one end, with an outlet of said clarified liquid on top of the other end, claim was sedimentation tank with an outlet of the solid particles are concentrated in the bottom 1 The solid-liquid separation device according to any one of claims 1 to 3 . The separation container, an inlet of the stock solution at one end, with an outlet of said clarified liquid at the bottom of the other end, claim to the floating vessel equipped with an outlet of the solid particles are concentrated in the top 1 The solid-liquid separation device according to any one of claims 1 to 3 . The separation container by centrifugation container outlet to the rotary drivable cylindrical with the solid particles are concentrated and the outlet of the clarified liquid at the other end with one end of the axial direction comprises an inlet for the undiluted and then, the inside of the centrifuge container, a solid-liquid separation device according to any one of claims 1 to 3 which is adapted provision of the airfoil partition plate having an airfoil-shaped cross section.

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