JP4381461B2 - Solid-liquid separation device, filtration device, and solid-liquid separation method - Google Patents

Description

  In particular, the present invention relates to a horizontal vacuum filtration device, a drum-type vacuum filtration device, and a belt press dewatering method using only a mechanical squeeze dewatering mechanism for filtering a workpiece supplied on a filter cloth that is wound around a plurality of rolls. The present invention relates to a solid-liquid separation apparatus suitable for use as a secondary dehydration mechanism of a filtration apparatus such as a filter, such a filtration apparatus using the solid-liquid separation apparatus, and a solid-liquid separation method.

  In general, such a horizontal vacuum filtration apparatus supplies a workpiece onto a filter cloth that runs continuously or intermittently on a vacuum tray, and is filtered by vacuum suction through the filter cloth through the vacuum tray. In general, a drum-type vacuum filtration apparatus is one that performs filtration by vacuum suction in a vacuum chamber through a filter cloth immersed in a slurry to be processed in a liquid tank. A differential pressure greater than atmospheric pressure cannot be applied. For this reason, it is difficult to achieve the target liquid content of the filtered cake, and a secondary dehydration device such as a centrifugal separator or a filter press must be provided separately from the subsequent filtration device. There are many cases.

Therefore, the inventors of the present invention, for example, in Patent Documents 1 and 2, are a frame-like or annular shape that can advance and retreat toward the filtered cake after the filtration by only the vacuum tray of such a horizontal vacuum filtration device. A solid-liquid separation device provided with a sealing means having a sealing material and a pressurizing means for pressurizing the cake with a pressure plate or a pressurized fluid (air, etc.) inside the opening surface of the sealing material, and a filter cloth in the subsequent stage Has been proposed in which a sealing material is brought into close contact with the cake that has been moved by the above-mentioned traveling, and the cake is depressurized by pressurizing means inside thereof.
JP 2006-297366 A JP 2007-83117 A

  However, even in a horizontal vacuum filtration apparatus or the like provided with such a solid-liquid separation apparatus, the surface pressure or line in the direction perpendicular to the filter cloth by a pressure plate or a pressure roll depends on the composition and properties of the workpiece. Only the pressure may make it difficult to sufficiently achieve the target liquid content of the cake. In addition, as described above, in the solid-liquid separation device that pressurizes the cake after moving to the subsequent stage by the traveling of the filter cloth, the sealing material is applied and applied as it is when the filter cloth travels continuously. I can't.

  The present invention has been made under such a background. In particular, the present invention can be used as a secondary dehydration mechanism of such a filtration device to sufficiently reduce the liquid content of an object to be processed (cake). It is an object of the present invention to provide a solid-liquid separation device capable of continuous solid-liquid separation, a filtration device including the solid-liquid separation device as a secondary dehydration mechanism, and a solid-liquid separation method.

In order to solve the above problems and achieve such an object, the solid-liquid separation device of the present invention has a pair of endless separation filter cloths superimposed on the outer periphery of a separation roll that is rotated in the circumferential direction. It is possible to travel along the rotation direction of the separation roll while being wound, and the object to be treated supplied between the separation filter cloths is sandwiched between the separation filter cloths on the outer periphery of the separation rolls. In addition to being squeezed, the aeration fluid is ejected to the outer circumference in the radial direction of the separation roll through the ventilation chamber formed in the inner peripheral portion of the separation roll and dehydrated by being ventilated. In addition, the solid-liquid separation method of the present invention is configured to travel along the rotation direction of the separation roll while winding a pair of endless separation filter cloths on the outer periphery of the separation roll that is rotated in the circumferential direction. Separation of these The object to be treated which is fed between the fabric, the addition to squeezing sandwiched between the separating filter cloth at the outer circumference of the separating roll, the aeration fluid through the vent chamber which is formed in the inner peripheral portion of the separating roll It dewaters by ejecting to the radial direction outer periphery of a separation roll, and ventilating.

  As described above, in the solid-liquid separation device and the solid-liquid separation method configured as described above, the object to be processed is supplied and sandwiched between the pair of separation filter cloths and wound around the outer periphery of the separation roll rotating in the circumferential direction. It is squeezed by being pressed. For this reason, not only when the rotation of the separation roll and the traveling of the separation filter cloth along the rotation direction are intermittent, but also when it is continuous, the supplied workpiece can be reliably processed.

When the separation roll is pressed against the outer periphery of the separation roll in this way, the workpiece is not only subjected to a pressing force in the radial direction of the separation roll, but also the separation filter on the separation roll side on the inner circumference with the workpiece to be sandwiched therebetween. Since the shearing force is also received in the circumferential direction due to the difference in running speed between the cloth and the separation filter cloth on the outer circumferential side opposite to the cloth, that is, the difference in circumferential speed, the cloth is efficiently squeezed. Furthermore, the processed material thus squeezed is aerated on the outer circumference in the radial direction of the separation roll, so that the liquid component is separated through one separation filter cloth. Effective removal of the liquid can be promoted even for a workpiece for which it has been difficult to sufficiently reduce the liquid content only by linear pressure and pressurization.

  Here, in order to dehydrate the work piece sandwiched between the pair of separation filter cloths wound around the outer periphery of the separation roll in this way by ventilating in the radial direction of the separation roll, for example, the separation roll Air may be supplied to the inner peripheral part so as to blow air to the outer peripheral side in the radial direction, but at this time, air is supplied to the inner peripheral part of the separation roll in the radial direction of the separation roll in this way. By forming a plurality of ventilation chambers that are separated from each other at substantially equal intervals in the circumferential direction, ventilation can be performed within a range in which a pair of separation filter cloths sandwiching a workpiece is wound around a separation roll. Thus, it is possible to prevent aeration from being performed even in a portion other than this range that does not participate in dehydration.

  In particular, in such a case, in the separation roll, by controlling so as to be ventilated only in a predetermined range in the circumferential direction, even within the range in which the pair of separation filter cloths are wound, It is possible to prevent the supply amount of air or the like for ventilation from being increased more than necessary, and promote efficient dehydration.

  By the way, when the material to be treated is vented from the radially inner periphery to the outer periphery of the separation roll, the separated liquid is wound around the outer periphery of the separation roll in the pair of separation filter cloths. However, since the roll is cylindrical, the discharged liquid is dehydrated again through the separation filter cloth along the outside of the separation filter cloth on the outer peripheral side. There is a risk of impregnating the material to be processed and impairing the decrease in the liquid content.

  Therefore, in such a case, the liquid separated from the object to be treated is further transferred to the outer periphery of the separation filter cloth wound around the outer periphery of the separation roll of the pair of separation filter cloths. By disposing a liquid removing means for removing from the separation filter cloth, it is possible to collect the liquid thus dehydrated before it soaks again into the object to be processed, thereby preventing deterioration of the liquid content. Here, as such a liquid removal means, for example, a scraping means for scraping the separated liquid from the separation filter cloth on the outer peripheral side can be adopted, and thus the liquid content is scraped off and removed. By doing so, the liquid component can be recovered while preventing it from seeping into the object to be treated again. In addition to this, or in addition to this, as another one, it is possible to recover by providing a suction means for sucking the liquid separated from the object to be processed.

  Further, the filtration device of the present invention is provided with a workpiece to be supplied from a supply unit on a filter cloth that is wound around a plurality of rolls and traveled, and is provided closer to the traveling direction side of the filter cloth than the supply unit. A filtering device for filtering the object to be processed by the filtering means, wherein the solid-liquid separation device of the present invention described above is disposed closer to the traveling direction than the filtering means, and the plurality of rolls Among these, the roll positioned on the side of the traveling direction from the filtering means is the separating roll, and the filter cloth is one of the pair of separating filter cloths.

  Therefore, in such a filtering device such as the above-described horizontal vacuum filtering device, the roll of the filtering device on the traveling direction side with respect to the filtering means is a separation roll of the solid-liquid separating device, and filtration is performed. Since the filter cloth of the apparatus is one of the pair of separation filter cloths of the solid-liquid separator, the object to be treated on the filter cloth filtered by the filtering means is more directly filtered than the filtering means. It is moved to the traveling direction side of the filter, that is, after the filtration means, and is sandwiched between the other separation filter cloth and wound around the separation roll so that it is squeezed and ventilated, and is effective as described above. Can be dehydrated.

  For this reason, it is possible to obtain an object to be treated with a low liquid content without providing a secondary dehydration device such as a centrifugal separator or a filter press separately from the filtration device at the subsequent stage. Thus, it is possible to reduce the burden on the drying device when drying the dehydrated workpiece. Moreover, since the filter cloth and roll of the filtration device can be used as the separation filter cloth and separation roll of the solid-liquid separation device, it is economical. And since the said solid-liquid separation apparatus can respond also to the continuous supply of a to-be-processed object, the horizontal type vacuum filtration apparatus with which a filter cloth drive | works continuously, a drum type vacuum filtration apparatus, and a belt press dehydrator Even with such a filtering device, the moisture content of the object to be treated can be reliably reduced.

  As described above, according to the solid-liquid separation apparatus and solid-liquid separation method of the present invention, the object to be processed is sandwiched between a pair of separation filter cloths that are overlapped and wound around a rotating separation roll. In addition to the pressing force in the radial direction of the separation roll, the workpiece can be effectively squeezed by applying a shearing force in the circumferential direction, and the liquid component is effective by aeration in the radial direction. Separation is possible. In addition, according to the filtration device of the present invention, it is possible to obtain an object to be treated having a lower liquid content efficiently and economically without using a secondary dehydration device by using such a solid-liquid separation device. it can. In addition, when a product is transported to a subsequent drying facility, it is possible to solve a transport trouble caused by adhesion to a transport device such as a belt conveyor or a screw conveyor.

  1 to 6 show an embodiment of the solid-liquid separation device of the present invention and a filtration device equipped with the solid-liquid separation device. As shown in FIG. 1, the filtration device in the present embodiment is stretched so that an endless filter cloth 1 is wound around a plurality of rolls 2 arranged parallel to each other with the central axis being horizontal. One of these is used as a drive roll 2A and is driven to rotate about the central axis, whereby the horizontal portion 1A horizontally passed to the upper part of the filter cloth 1 is moved in the traveling direction indicated by the arrow F. The workpiece P supplied from the supply means 3 disposed on the rear side in the traveling direction F of the horizontal portion 1A is allowed to travel so that the workpiece P is immediately connected to the driving roll 2A on the traveling direction F side. It is set as the structure of a horizontal type vacuum filtration apparatus filtered through the filter cloth 1 by the filtration means 4 arrange | positioned in the middle.

  Here, the driving roll 2A is located at the end of the horizontal portion 1A on the traveling direction F side, and is rotated by a driving means (not shown), thereby continuously or intermittently at a predetermined pitch. Run 1 Further, in the filtering means 4, the processed material P is filtered by sucking the liquid component through the filter cloth 1 by a vacuum tray (not shown) that supports the filter cloth 1 in the horizontal portion 1 </ b> A. Further, a solid-liquid separator according to an embodiment of the present invention is disposed on the side of the traveling direction F from the filtering means 4 as shown by a broken line in FIG.

  In the solid-liquid separation device of this embodiment, as shown in FIG. 2, a pair of endless separation filter cloths 1 and 5 are superimposed on the outer periphery of a separation roll 2B that is rotated in the circumferential direction toward the rotation direction T. It is assumed that the vehicle can travel along the rotation direction T while being wound. The separation roll 2B is a roll positioned next to the drive roll 2A in the traveling direction F among the rolls 2 in the filtration device, and one of the pair of separation filter cloths 1 and 5 is filtered. The filter cloth 1 of the apparatus is wound around the separation roll 2B as it is.

  In the present embodiment, the separation roll 2B is disposed so as to have a space below the drive roll 2A and so that their peripheral surfaces overlap each other in plan view. Note that the roll 2 of the filtration device other than the drive roll 2A and the separation roll 2B has a sufficiently smaller diameter than the drive roll 2A and the separation roll 2B, and of these, the roll next to the separation roll 2B in the travel direction F 2C is arrange | positioned so that the surrounding surface may mutually overlap in the planar view at intervals over the separation roll 2B.

  Further, as shown in FIG. 3, the separation roll 2B has a substantially hollow cylindrical shape, and the cylindrical surface portion is inside the range of the width of the filter cloth 1 in the central axis direction of the separation roll 2B. In addition, a large number of through holes 6 are opened. On the other hand, a plurality of partition plates 7 extending in the radial direction from the central axis portion and reaching the cylindrical surface portion in the cross section orthogonal to the central axis line are provided in the inner circumferential portion of the separation roll 2B that is substantially hollow. It is arranged at equal intervals and over the range in which the through-hole 6 is formed, and both ends in the central axis direction of these partition plates 7 are respectively closed by circular end plates, and one of these is closed. The same number of ventilation pipes 8 as the partition plates 7 are connected to the end plates so as to communicate with the spaces between the pair of partition plates 7 adjacent in the circumferential direction.

  Therefore, the same number of ventilation chambers 9 communicating from the ventilation pipe 8 to the through-hole 6 are isolated from each other at the inner peripheral portion of the separation roll 2B and are substantially separated in the circumferential direction. Aeration fluid such as air (compressed air) A and steam, which is formed at equal intervals and supplied to each ventilation pipe 8, is jetted from the through hole 6 to the outer periphery of the separation roll 2 </ b> B through the ventilation chamber 9. It will be ventilated. The air A supplied to these ventilation pipes 8 is supplied from a supply source (not shown) to the ventilation pipe 8 fixed to the rotating separation roll 2B via a rotary joint or a multistage rotary joint, and the rotary A Between the joint or the like and each ventilation pipe 8, the separation filter cloths 1 and 5 are wound in the circumferential direction of the separation roll 2B (in the range indicated by the symbol E in FIG. 2) and further at a predetermined rotational position. Only a certain venting chamber 9 is provided with a valve mechanism (not shown) that controls the air A to be continuously supplied while being sequentially switched with the rotation of the separation roll 2B.

  The other separation filter cloth 5 of the pair of separation filter cloths 1 and 5 has the same width as the filter cloth (one separation filter cloth) 1, and the outer periphery of the separation roll 2 </ b> B is located inside the filter cloth 1. In addition to being wound, the outer periphery of the driving roll 2A and the roll 2C is also wound outside the filter cloth 1, and is positioned above the driving roll 2A and the roll 2C so that the distance between them is the driving roll 2A. Is wound around a pair of rolls 10 that are larger than the distance between the roll 2C and the roll 2C, and is disposed endlessly. The separation filter cloth 5 is allowed to travel along the traveling direction F of the filter cloth 1 at a portion wound together with the filter cloth 1.

  In the filtration device and the solid-liquid separation device, the rolls 2 and 10 other than the drive roll 2A are driven rolls that are not connected to the drive means including the separation roll 2B. At least one of the removed filter roll 2 and the solid-liquid separator roll 10 is provided with a filter cloth 1 by urging the rolls 2 and 10 away from the other rolls 2 and 10. And tension control means for controlling the tension of the separation filter cloth 5 to a predetermined strength. In the solid-liquid separator, a tray 11 is disposed below the separation roll 2B.

  In the filtration device equipped with such a solid-liquid separation device, the processed product P filtered by the filtration means 4 is between the pair of separation filter cloths 1 and 5 from the outer periphery of the drive roll 2A as shown in FIG. After being sandwiched and supplied to the solid-liquid separation device and wound around the separation roll 2B together with these separation filter cloths 1 and 5, the separation filter cloth 5 is separated in the roll 2C, and further in the traveling direction F, the next roll 2C. The roll 2 is peeled off from the filter cloth 1 and collected.

  And in one Embodiment of the solid-liquid separation apparatus of the said structure and the solid-liquid separation method of this invention using this, the to-be-processed P is between a pair of separation filter cloths 1 and 5 on the outer periphery of the separation roll 2B. The filter cloth 1 that is sandwiched and wound around the workpiece P in particular is given a predetermined tension by the tension control means, so that a pressing force is applied to the radially inner peripheral side of the separation roll 2B. Squeezed. Further, in this separation roll 2B, air A penetrates from the ventilation pipe 8 through the ventilation chamber 9 in the range of a predetermined rotational position in the range where the separation filter cloths 1 and 5 are wound as described above. It was continuously blown out from the hole 6 and passed through the separation filter cloth 5, the object to be treated P, and the separation filter cloth 1 to the outer peripheral side in the radial direction of the separation roll 2B. The liquid component is separated from the object to be processed P through the separation filter cloth 1 and dropped into the tray 11 and collected.

  In addition, the pair of separation filter cloths 1 and 5 wound around the separation roll 2B with the workpiece P sandwiched therebetween are different in distance from the central axis of the separation roll 2B by the thickness of the workpiece P, and While one separation filter cloth 1 is directly wound around the drive roll 2A and traveled, the other separation filter cloth 5 is driven and traveled through the one separation filter cloth 1 and the workpiece P. Therefore, a circumferential speed difference is generated between the pair of separation filter cloths 1 and 5 on the outer periphery of the separation roll 2B. Therefore, the workpiece P is subjected to a shearing force to shear the workpiece P in the circumferential direction due to the peripheral speed difference, and the workpiece P is efficiently squeezed by the shearing force and the pressing force. Since dehydration is also performed by the aeration, it is possible to sufficiently reduce the liquid content even for the workpiece P, which has conventionally been difficult to separate sufficiently.

  Further, in the solid-liquid separation device and the solid-liquid separation method, as described above, since the object to be processed P is dehydrated on the outer periphery of the separation roll 2B that rotates following the traveling of the filter cloth 1, the filtration device Whether the filter cloth 1 is running continuously or intermittently, efficient dehydration can be achieved by the pressing force, shearing force, and ventilation. Accordingly, when the filter cloth 1 is caused to travel by rotating the drive roll 2A continuously or intermittently, for example, the filter cloth 1 is clamped and travels by intermittently moving in the traveling direction F with a predetermined stroke. It can be applied to a horizontal vacuum filtration apparatus.

  On the other hand, in the filtration device having the above-described configuration including such a solid-liquid separation device, the roll 2 next to the drive roll 2A on the traveling direction F side than the filtration means 4 is separated from the separation roll 2B in the solid-liquid separation device. In addition, the filter cloth 1 itself that filters the workpiece P in the filtering means 4 is one of the pair of separation filter cloths 1 and 5 of the solid-liquid separator. For this reason, the to-be-processed object P on the filter cloth 1 filtered by the filtration means 4 can be supplied to a solid-liquid separation device by running the filter cloth 1 as it is, and can be efficiently dehydrated as described above.

  Therefore, it is necessary to recover the material P to be processed, which has been filtered by the filtering means 4 of the filtering device, from the filtering device and dehydrate it by a secondary dehydrating device such as a centrifugal separator or a filter press. Further, for example, it can be applied to a filtering device such as an existing horizontal vacuum filtering device with a slight modification, which is economical. Furthermore, since the liquid content can be sufficiently reduced as described above, for example, even when the workpiece P from which the liquid component is separated is dried in a subsequent drying apparatus, the burden on the drying apparatus is reduced. Can be reduced. In addition, even when the product is transported to such a subsequent drying apparatus, it is possible to solve troubles caused by adhesion of the processed material P having a large amount of liquid to a transport device such as a belt conveyor or a screw conveyor. Become.

  Further, in the solid-liquid separation device of the present embodiment, a plurality of ventilation chambers 9 venting in the radial direction of the separation roll 2B through the through holes 6 are separated from each other in the circumferential direction in the inner peripheral portion of the separation roll 2B. For example, a pair of separation filter cloths 1 and 5 sandwiching the object P to be processed are ventilated in a portion not involved in dehydration other than a range E where the separation roll 2B is wound around the separation roll 2B. Thus, the air A for ventilation can be prevented from being wasted, and the workpiece P can be intensively ventilated by the ventilation chamber 9 in the range E.

  Here, air A may be supplied to all the aeration chambers 9 in the rotational position of the range E around which the separation filter cloths 1 and 5 are wound. In order to suppress an increase in operating costs and equipment costs, it is preferable to control the air A to be supplied only to the aeration chamber 9 located at a predetermined rotational position, so that dehydration can be performed more efficiently. That is, by selecting the ventilation chamber 9 by the valve mechanism and performing ventilation, the ventilation is always performed at the predetermined rotation position regardless of the rotation of the separation roll 2B, and dehydration is achieved. Since ventilation is not performed at positions other than, unnecessary consumption of air A or the like can be more reliably suppressed.

  By the way, in the solid-liquid separation apparatus of this embodiment, the to-be-processed object P squeezed by the outer periphery of the separation roll 2B ventilates air A etc. which are ventilated from the through-hole 6 in the outer peripheral surface of the separation roll 2B on the inner peripheral side. The liquid component is separated and dehydrated by the fluid, and the liquid component separated from the workpiece P is dropped onto the tray 11 and collected as described above. Then, since the separation filter cloths 1 and 5 and the workpiece P are wound under the separation roll 2B, the separated liquid wraps around the lower side of the separation roll 2B without dropping on the tray 11. Thus, by impregnating the workpiece P again through the separation filter cloth 1 located on the outer peripheral side, there is a risk of inhibiting the decrease in the liquid content of the workpiece P.

  Therefore, in such a case, instead of the tray 11 or together with the tray 11, as shown in FIGS. 4 and 5, the workpiece P is further disposed on the outer circumferential side of the separation filter cloth 1 on the outer circumferential side. A liquid removal means for removing the liquid separated from the separation filter cloth 1 on the outer peripheral side may be provided. Here, in FIG. 4, the liquid removing unit is a suction unit 12 that sucks and collects the liquid separated from the workpiece P, and the suction unit 12 is, for example, as shown in FIG. A plurality of slits 12B extending in parallel to the center line of the suction tube 12A are formed in the circular suction tube 12A in a row so as to penetrate in the radial direction and at intervals in the center line direction. One end of the suction pipe 12A is closed, and a suction device such as a pump (not shown) that sucks air A is connected to the other end.

  In the liquid removing means (suction means 12) shown in FIG. 4, the suction tube 12A has a slit 12B with its center line parallel to the center axis of the separation roll 2B as shown in FIG. 4 (A). A plurality of intervals are provided in the circumferential direction below the separation roll 2B so as to face or contact the separation filter cloth 1 on the outer circumferential side. Accordingly, the liquid component that has flowed to the lower side of the separation roll 2B is sucked and collected together with the air A from the slit 12B of the suction tube 12A in the suction means 12, and this liquid component is again passed through the separation filter cloth 1. Infiltration into the workpiece P can be prevented, and the liquid content of the workpiece P can be more reliably reduced.

  Further, instead of or together with the liquid removing means comprising the suction means 12, as shown in FIG. 5, the separation filter cloth 1 on the outer peripheral side is further separated from the workpiece P on the outer peripheral side. The scraping means 13 for scraping and removing the liquid component from the separation filter cloth 1 may be disposed as the liquid component removing means. This scraping means 13 is a scraper 13A made of a rectangular plate having elasticity such as a rubber plate, for example, and is disposed so that one side edge thereof is bent and is brought into sliding contact with the outer periphery of the separation filter cloth 1. . Here, in FIG. 5, such a scraper 13 </ b> A is disposed slightly behind the separating filter cloth 1 in the traveling direction F rather than directly below the central axis of the separating roll 2 </ b> B, and the one side edge is behind the traveling direction F. It is made to contact the outer periphery of the separation filter cloth 1 so as to bend to the side.

  Accordingly, even in such a liquid removing unit (scraping unit 13), the liquid component that has come to the lower side of the separation roll 2B is scraped to the scraper 13A of the scraping unit 13 as the separation filter cloth 1 travels. Since it is removed from the surface of the separation filter cloth 1 so as to be taken and dropped through the scraper 13A, the liquid component permeates the workpiece P again by collecting it with the tray 11 or the like. Can be prevented. Although only one scraping means 13 is shown in FIG. 5, a plurality of scraping means 13 may be provided at intervals in the circumferential direction of the separation roll 2B.

  On the other hand, in the filtration device of the above embodiment, the driving roll 2A is disposed on the side of the filtration means 4 immediately in the traveling direction F, and the separation roll 2B of the solid-liquid separation device is the next roll 2, For example, as in the horizontal vacuum filtration apparatus shown in FIG. 6, the roll 2 that forms the horizontal portion 1A of the filter cloth 1 located on the traveling direction F side of the filtering means 4 is used as the separation roll 2B of the solid-liquid separation apparatus. Separately from this, the drive roll 2A may be provided, for example, at a position where the filter cloth 1 circulates in the lower part of the filtering device, on the traveling direction F side with respect to the solid-liquid separator, and on the near side in the traveling direction F with respect to the supply means 3. . That is, in a filtration device in which the workpiece P is supplied onto the filter cloth 1 wound around a plurality of rolls 2 and filtered by the filtering means 4 such as a horizontal vacuum filtration device, the filtered workpiece In the range where P is on the filter cloth 1, the solid-liquid separation device of the present invention can be disposed regardless of which roll 2 is the separation roll 2B. However, in the case shown in FIG. 6, the filter cloth 1 for filtering the workpiece P in the filtering means 4 is wound in contact with the separation roll 2B as a separation filter cloth on the inner peripheral side, and a solid-liquid separation device The separation filter cloth 5 is wound around the outer peripheral side of the separation roll 2B with the workpiece P interposed therebetween as a separation filter cloth on the outer peripheral side.

  Although it is possible to share the drive roll 2A and the separation roll 2B, when the air A is blown out from the outer peripheral surface of the separation roll 2B as in the solid-liquid separation device of this embodiment, the ventilation is performed. This reduces the friction between the separation roll 2B and the filter cloth 1 and causes slippage, which may make it difficult to reliably run the filter cloth 1 at a predetermined speed or pitch. It is desirable that the drive roll 2A for traveling and the separation roll 2B of the solid-liquid separation device are provided separately. However, for example, if a sufficient frictional force for running the filter cloth 1 can be generated by applying a sufficient pressing pressure, the drive roll 2A and the separation roll 2B can be shared as described above. Yes, that is, it is still possible to arrange the solid-liquid separation device of the present invention regardless of which roll 2 is the separation roll 2B.

  Examples of the present invention will be given below to demonstrate the effects. In this example, using the filtration device of the embodiment shown in FIGS. 1 to 3, four kinds of objects P (samples A to D) having a solid particle diameter of 2.5 to 30 μm are filtered. The cakes having different liquid contents filtered only by vacuum dehydration in the means 4 are supplied as they are to the solid-liquid separation device of the above-mentioned embodiment provided in the filtration device, and the liquid components are separated. The liquid content of the cake dehydrated by this solid-liquid separator was measured by changing (increasing) the pressure of the air A.

However, the separation filter cloths 1 and 5 used in this example have an air permeability of 0.5 to 5 cc / sec / cm ² , and the separation roll 2B has through-holes 6 having a diameter of 5 mm drilled at a pitch of 8 mm in the cylindrical surface portion. In addition, the cake thickness in the solid-liquid separator was 3 to 10 mm, the dehydration time was 10 to 30 sec, and the pressing pressure was 0.1 to 0.3 MPaG.

  The results are shown in the following Tables 1 to 4 together with the liquid content of only vacuum dehydration for each sample A to D. Moreover, in FIG. 7, sample AD is put together and the relationship between an air pressure and a cake moisture content and its tendency are shown.

  From the results of Tables 1 to 4 and FIG. 7, it is clear that according to the examples of the present invention, the liquid content is lower than that of the cake only by vacuum dehydration. It can be seen that the liquid ratio is reduced to nearly half compared with vacuum dehydration alone. It can also be seen that the cake liquid content tends to decrease greatly as the air pressure increases, but the decrease rate of the liquid content varies depending on the sample, and even if the air pressure is increased, the cake passes through the cake. If the amount of air to be used is large, the overall energy efficiency will be deteriorated.

It is the schematic which shows one Embodiment of the filtration apparatus of this invention. 1 shows an embodiment of the solid-liquid separation device of the present invention used in the filtration device shown in FIG. 1. It is a partially broken perspective view which shows the separation roll 2B of the solid-liquid separator shown in FIG. 3A is a partial cross-sectional view of a lower side of a separation roll 2B showing a modification of the solid-liquid separation device shown in FIG. 2, and FIG. It is a fragmentary sectional view under the separation roll 2B which shows the other modification of the solid-liquid separation apparatus shown in FIG. It is the schematic which shows the modification of the filtration apparatus shown in FIG. In the Example of this invention, it is a figure which shows the relationship between the air pressure and cake liquid content in each sample AD.

Explanation of symbols

1 Filter cloth (separate filter cloth)
2, 10 rolls 2A drive rolls 2B separation rolls 3 supply means 4 filtration means 5 separation filter cloth 9 aeration chamber 12 suction means 13 scraping means P object to be processed A air F traveling direction of filter cloth 1

Claims (8)

A pair of endless separation filter cloths are overlapped and wound around the outer periphery of the separation roll that is rotated in the circumferential direction, and can travel along the rotation direction of the separation rolls. The supplied workpiece is sandwiched and compressed between the separation filter cloths at the outer periphery of the separation roll, and the aeration fluid is separated through the ventilation chamber formed in the inner periphery of the separation roll. A solid-liquid separator, wherein the solid-liquid separator is dehydrated by being jetted and aerated on the outer periphery in the radial direction of the roll. The inner periphery of the separating roller, a plurality of the vent chamber to vent to the radial direction of the separation roll, to claim 1, characterized in that it is formed at substantially equal intervals in the circumferential direction are isolated from each other The solid-liquid separator described.   3. The solid-liquid separation device according to claim 1, wherein the separation roll is ventilated only in a predetermined range in a circumferential direction in a range in which the pair of separation filter cloths are wound. . Further outer periphery of the separating filter cloth wound around the outer peripheral side of the separating roll of the pair of separation filter cloth is a liquid to remove the liquid component separated from the object to be treated from the separation filter cloth of the outer peripheral side The solid-liquid separation device according to any one of claims 1 to 3, further comprising a minute removing unit.   5. The solid-liquid separator according to claim 4, wherein the liquid removing unit is a scraping unit that scrapes off the separated liquid.   6. The solid-liquid separation device according to claim 4, wherein the liquid removal means includes a suction means for sucking the separated liquid.   An object to be processed is supplied from a supply means onto a filter cloth that is wound around a plurality of rolls and traveled, and the object to be processed is filtered by a filtering means provided on the traveling direction side of the filter cloth from the supply means. The solid-liquid separation device according to any one of claims 1 to 6 is disposed closer to the traveling direction side than the filtering means, Of the plurality of rolls, a roll positioned on the traveling direction side of the filtration means is the separation roll, and the filter cloth is one of the pair of separation filter cloths. Filtration device. A pair of endless separation filter cloths are overlapped and wound around the outer periphery of the separation roll that is rotated in the circumferential direction, and travels along the rotation direction of the separation rolls, and the substrate supplied between these separation filter cloths is wound. The processed material is sandwiched between the separation filter cloths at the outer periphery of the separation roll and squeezed, and the aeration fluid is supplied to the outer periphery in the radial direction of the separation roll through a ventilation chamber formed in the inner peripheral portion of the separation roll. A solid-liquid separation method characterized by dehydrating by blowing and aeration.

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