JP4381462B1 - Solid-liquid separation device, filtration device, and solid-liquid separation method - Google Patents

Abstract

A solid-liquid separation device capable of sufficiently reducing the liquid content of an object to be processed (cake) and capable of continuous solid-liquid separation, as a secondary dehydration mechanism of a filtration device, and the solid-liquid separation Provided are a filtration device equipped with a separation device as a secondary dehydration mechanism, and a solid-liquid separation method.
A pair of endless separation filter cloths 1 and 8 are wound around the outer periphery of a separation roll 7 that is rotated in the circumferential direction, and a pressing belt 15 is further wound around the outer periphery of the separation filter cloths 1 and 8. , The pair of separation filter cloths 1 and 8 and the pressing belt 15 are caused to travel along the rotation direction T of the separation roll 7, and the object to be processed supplied between the pair of separation filter 1 and 8 cloths. P is sandwiched between the separation filter cloths 1 and 8 on the outer periphery of the separation roll 15 and squeezed by the squeezing belt 15, and dehydrated by aeration in the radial direction of the separation roll 7.
[Selection] Figure 2

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.

  Among such filtration devices, for example, a horizontal vacuum filtration device generally supplies an object to be processed onto a filter cloth that runs continuously or intermittently on the vacuum tray, and the vacuum tray passes through this filter cloth. Filtering is performed by vacuum suction, and a drum-type vacuum filtration device generally filters by vacuum suction in a vacuum chamber through a filter cloth immersed in a slurry to be processed in a liquid tank. In general, however, 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. In addition, a squeezing belt is wound around the outer periphery of the pair of separation filter cloths, and the pair of separation filter cloths and the squeezing belt are allowed to travel along the rotation direction of the separation roll. The workpiece supplied between the pair of separation filter cloths is sandwiched between the separation filter cloths at the outer periphery of the separation rolls and compressed by the pressing belt, and the inner periphery of the separation rolls. Through the aeration gas chamber formed in the section, the aeration gas is ejected to the outer circumference in the radial direction of the separation roll and is dehydrated by being aerated.

In the solid-liquid separation method of the present invention, an endless pair of separation filter cloths are overlapped and wound around the outer periphery of the separation roll rotated in the circumferential direction, and the pair of separation filter cloths are further wound around the outer periphery of the pair of separation filter cloths. A pair of separation filter cloths and the above-mentioned compression belt are run along the rotation direction of the above-mentioned separation roll by winding a compression belt, and the object to be treated supplied between the pair of separation filter cloths is separated from the above-mentioned separation While being sandwiched between the separation filter cloths at the outer periphery of the roll and squeezed by the squeezing belt, the aeration gas is ejected to the outer circumference in the radial direction of the separation roll through the aeration gas chamber formed at the inner circumference of the separation roll. And dewatering by aeration.

  Therefore, 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 the outer periphery of the separation roll rotating in the circumferential direction is While being run along the rotation direction, the belt is wound and pressed, and from the outer periphery, the squeezing belt is also squeezed by being wound and pressed while running in the rotation direction of the separation roll. 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.

Further, when the workpiece is pressed against the outer periphery of the rotating 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 inner separation roller side across the workpiece. 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 peripheral side opposite to the cloth, that is, the difference in peripheral speed, the cloth is efficiently squeezed. And since the processed material squeezed in this way is further aerated to the outer periphery in the radial direction of the separation roll, the liquid component is separated through the separation filter cloth on the outer peripheral side, so the surface in the direction perpendicular to the filter cloth Effective removal of the liquid can be promoted even for the object to be processed, in which it is difficult to sufficiently reduce the liquid content only by the pressure, the linear pressure, and the pressurization.

  In addition, a squeezing belt is wound around the outer periphery of the separation filter cloth on the outer peripheral side, so that the separation filter cloth and the object to be processed can be reliably pressed against the separation roll side. Even when the aeration pressure is increased in order to increase the capacity, the separation filter cloth can be obtained by making the surface pressure of the squeezing belt wound around the separation roll larger than the aeration gas pressure venting in the radial direction of the separation roll. By floating, the pressure fluid (ventilation gas) is dispersed and the drainage effect due to ventilation is lost, and the cake is prevented from being blown out and scattered from both sides in the width direction of the separation filter cloth and from the front and back of the traveling direction. As a result, the drainage effect can be improved more reliably.

  In addition, as for the said compression belt, it is desirable for air permeability to be higher than a separation filter cloth so that the liquid removal from a to-be-processed object through a separation filter cloth may not be inhibited. The press belt may be a filter cloth or a metal belt made of a wire mesh or a chain as long as it has a high air permeability and can withstand a tension that generates a surface pressure larger than the gas pressure as described above. Further, it may be a resin belt made of high-strength fibers such as aramid fiber, polyethylene fiber, polyarylate fiber, carbon fiber, or rubber belt.

  Further, the filtration device of the present invention is provided with a workpiece to be supplied from a supply means on a filter cloth that is wound around a plurality of rolls, and is provided closer to the running direction side of the filter cloth than the supply means. A filtering device for filtering the object to be treated 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, Of the rolls, a roll positioned closer to the traveling direction than 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. As described above, it is moved to the traveling direction side of the filter, that is, after the filtration means, sandwiched between the other separation filter cloth, wound around the separation roll together with the squeezing belt, and squeezed and ventilated. Can be dehydrated.

  Here, in the solid-liquid separator of the present invention, since the squeezing belt is further wound around the outer periphery of the pair of separation filter cloths wound around the separation roll as described above, the separation roll and the separation filter cloth by aeration are used. And the separation filter cloth can be pressed against the separation roll with a sufficient surface pressure and reliably run in the rotation direction as the separation roll rotates. Therefore, even if this separation roll is a drive roll for running the filter cloth in a horizontal vacuum filtration apparatus or the like, it is possible to suppress a decrease in the drive force and to achieve stable running of the filter cloth.

  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 apparatus 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 device and the solid-liquid separation method of the present invention, the workpiece is sandwiched between the pair of separation filter cloths wound around the rotating separation roll, and further on the outer periphery thereof. The pressure belt is wound around and moved in the rotational direction along with the rotation of the separation roll, so that in addition to the pressing force due to the radial direction of the separation roll, a shearing force in the circumferential direction is applied, and the object to be processed is It can be squeezed effectively. Furthermore, the pressure filter belt can prevent the separation filter cloth from floating from the separation roll or the cake from the end of the separation filter cloth due to radial aeration, effectively reducing the liquid content of the workpiece. It becomes possible to separate.

  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. Furthermore, the reduction of the frictional force between the separation roll and the separation filter cloth due to aeration can be suppressed, and the separation filter cloth can be reliably traveled integrally in the rotation direction of the separation roll by the pressing belt. While the roll is used as a driving roll for a filtration device such as a horizontal vacuum filtration device, and the separation filter cloth is used as a filter cloth for the filtration means of the filtration device, the filter cloth can be stably run.

  1 to 3 show one embodiment of a 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 5 such as a motor via a variable speed reducer 6 as shown in FIG. The filter cloth 1 is run continuously or intermittently at a predetermined pitch. 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.

  2 and 3, the solid-liquid separation device of this embodiment has a pair of endless separation filter cloths 1 and 8 on the outer periphery of a separation roll 7 that is rotated in the circumferential direction toward the rotation direction T. However, the workpiece P filtered by the filtering means 4 is superimposed and wound so as to sandwich the workpiece P therebetween, and can travel along the rotation direction T. The separation filter cloths 1 and 8 are made of, for example, polyethylene fibers or polyester fibers. Here, in this embodiment, the drive roll 2A of the rolls 2 in the filtration device is the separation roll 7, and one of the pair of separation filter cloths 1 and 8 is the filter cloth 1 of the filtration device. It is assumed that it is wound around the separation roll 7 as it is.

  The separation roll 7 (driving roll 2A) has a substantially hollow cylindrical shape, and the cylindrical surface portion has a width range of the filter cloth 1 in the central axis direction of the separation roll 7 as shown in FIG. In addition, a large number of through holes 9 are opened on the inner side and in the circumferential direction over the entire circumference of the separation roll 7. On the other hand, a plurality of ventilation gas chambers 10 respectively communicating with these through holes 9 are provided in the inner peripheral portion of the separation roll 7 in a range substantially equal to the range in which the through holes 9 are formed in the central axis direction. In the circumferential direction, the inner circumferential portion of the separation roll 7 is separated from each other so as to be divided into arcs at substantially equal intervals along the entire circumference of the separation roll 7.

  Further, the same number of vent pipes 11 as the vent gas chambers 10 are inserted into the inner peripheral portion of the separation roll 7 from one end side in the central axis direction (the right side in FIG. 3), and connected to each vent gas chamber 10. Aeration gas A such as air (compressed air) or steam supplied to each ventilation pipe 11 is jetted from the through-hole 9 to the outer periphery of the separation roll 7 through the ventilation gas chamber 10 to be ventilated. . The ventilation gas A is supplied from a supply source (not shown) through a rotary joint (or multistage rotary joint) 12 to a ventilation pipe 11 fixed to the rotating separation roll 7.

  Further, an automatic valve 13 is provided for each ventilation pipe 11 between the ventilation gas branch chamber 12 </ b> A on the separation roll 7 side connected to the rotary joint 12 and each ventilation pipe 11. Here, the automatic valve 13 is opened and closed by a limit switch 13A attached to the separation roll 7 and operated in accordance with the rotational position of each ventilation bus chamber 10 to signal the ventilation gas A from the ventilation gas branch chamber 12A. Control is performed by supplying or not supplying the automatic valve 13 as a gas via the supply pipe 13B.

  And by this automatic valve 13 controlled in this way, in this embodiment, among the ventilation gas chambers 10 in the range where the separation filter cloths 1 and 8 are wound in the circumferential direction of the separation roll 7, they are further moved to a predetermined rotational position. The aeration gas A is continuously supplied only to a certain aeration gas chamber 10 while being sequentially switched as the separation roll 7 rotates. That is, when the vent gas chamber 10 is in this predetermined rotational position, the automatic valve 13 is opened and the vent gas A is always supplied to the vent gas chamber 10 and ejected from the through-hole 9, while other than this predetermined rotational position. In the position (1), the automatic valve 13 is closed so that ventilation is not performed.

  On the other hand, of the pair of separation filter cloths 1 and 8, the other separation filter cloth 8 has a width substantially equal to that of the filter cloth (one separation filter cloth) 1. It is possible to travel in the same traveling direction G as the traveling direction F integrally with the filter cloth 1 in the rotation direction T of the separation roll 7 (drive roll 2A). Further, the roll 2B around which the other separation filter cloth 8 is wound next to the separation roll 7 in the traveling direction G is common to the roll 2 around which the filter cloth 1 is wound as shown in FIG. The other separation filter cloth 8 from 2B is drawn downward on the side opposite to the filter cloth 1 and separated, wound around a plurality of rolls 14 and wound endlessly to reach the outer periphery of the separation roll 7 again. Has been.

  And on the outer periphery of the separation roll 7 on which the pair of separation filter cloths 1, 8 are overlapped and wound in this way, a pressing belt 15 is wound around the outer periphery of the other separation filter cloth 8. The squeezing belt 15 can travel along the rotational direction T in the same traveling direction H as the traveling directions F and G along the outer periphery of the separating roll 7 together with the pair of separating filter cloths 1 and 8. Here, the squeezing belt 15 is made of a filter cloth similar to the separation filter cloths 1 and 8, a metal belt made of a wire net or a chain, or a high-strength fiber such as an aramid fiber, a polyethylene fiber, a polyarylate fiber, or a carbon fiber. However, the air permeability is higher than that of the separation filter cloths 1 and 8.

  In this embodiment, the squeezing belt 15 is wider than the separation filter cloths 1 and 8, and both ends in the width direction of the squeezing belts 15, as shown in FIG. It is wound around the separation roll 7 so as to cover the separation filter cloths 1 and 8 beyond each other. However, if the width of the squeezing belt 15 is wider than the cake width of the workpiece P that is sandwiched between the pair of separation filter cloths 1 and 8 and squeezed, it needs to be wider than the separation filter cloths 1 and 8. In other words, the width may be approximately equal to the separation filter cloths 1 and 8, or may be narrower than this. Further, in the traveling direction H, the squeezing belt 15 next to the separation roll 7 is wound around the common roll 2B around which the pair of separation filter cloths 1 and 8 are wound, and then the separation roll as shown in FIG. 7 and the other separation filter cloth 8 wound around the roll 14 are sequentially wound around a plurality of rolls 16, and the other separation filter cloth 8 is immediately before reaching the separation roll 7. It is wound around the roll 14 </ b> A to be wound together with the other separation filter cloth 8 and wound endlessly so as to reach the outer periphery of the separation roll 7 again.

  The rolls 2A, 14A, and 16 around which the compression belt 15 is wound are made larger in diameter than the rolls 2 and 14 around which only the other separation filter cloths 1 and 8 are wound, and more than the separation roll 7. Further, one of the plurality of rolls 16 is attached to an arm 17C of a squeezing belt tensioning device 17 that is rotatable by a cylinder device 17B around a support shaft 17A. A predetermined tension is applied to the squeezing belt 15 by rotating and positioning at a predetermined position.

  Further, at least one end of the other one of the plurality of rolls 16 is attached to the bracket 18B of the squeezing belt meandering correction device 18 that advances and retreats in the running direction H of the squeezing belt 15 by the cylinder device 18A. Thus, when the bracket 18B is moved forward and backward in the traveling direction H and the inclination of the roll 16 with respect to the traveling direction H is finely adjusted, when the meandering occurs in the traveling of the pressing belt 15, this is corrected. Yes. However, in the filtration apparatus and the solid-liquid separation apparatus of this embodiment including these rolls 16, none of the rolls 2, 14, 16 other than the drive roll 2A (separation roll 7) is connected to the drive means. It is supposed to be a roll.

  Further, a squeezing belt cleaning device 19 is provided in the traveling path of the squeezing belt 15, and a separation filter cloth cleaning device 20 is provided in the traveling path of the other separation filter cloth 8. Also, a cleaning device (not shown) is provided, and a tray 21 is disposed at the bottom of the solid-liquid separation device. Furthermore, a discharge port 22 is provided below the roll 2B to discharge the cake of the workpiece P that has been solid-liquid separated by the solid-liquid separation device, and the roll 2B is directed in its running direction F. For the pair of separation filter cloths 1 and 8 that are separated from each other in the opposite direction, a scraper 23, a wire, and the like are disposed so as to be in contact with the surface that has been in contact with the workpiece P. Further, on the further outer peripheral side of the portion where the separation filter cloths 1, 8 and the compression belt 15 are wound around the separation roll 7, a collection plate 24 having an arcuate cross section is disposed at a distance from the compression belt 15. The liquid separated by aeration is collected and guided to the tray 21.

  In one embodiment of such a solid-liquid separation device, a filtration device equipped with the solid-liquid separation device, and a solid-liquid separation method of the present invention using the solid-liquid separation device, the solid-liquid separation device is filtered by the filtration means 4 of the filtration device. The processed material P is sandwiched between the pair of separation filter cloths 1 and 8 on the outer periphery of the separation roll 7 of the solid-liquid separation device, and the pressing belt 15 is wound around the outer periphery with high tension. The pressing force is squeezed on the radially inner peripheral side of the separation roll 7. Therefore, even when there is a drying step after the solid-liquid separation step of the object P to be processed by the solid-liquid separation device, the load in the drying step can be reduced.

  In addition, the pair of separation filter cloths 1 and 8 wound around the separation roll 7 with the workpiece P sandwiched between them have different distances from the central axis of the separation roll 7 by the thickness of the workpiece P. The separation filter cloth 1 is directly wound around the separation roll 7 (drive roll 2A) and traveled, whereas the other separation filter cloth 5 and the pressing belt 15 are separated from 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 7, and the circumferential speed difference causes the workpiece P to be treated in the circumferential direction. The workpiece P is efficiently squeezed by the shear force and the pressing force.

  Further, in the separation roll 7, the ventilation gas A flows from the ventilation pipe 11 through the ventilation gas chamber 10 at a predetermined rotational position within the range where the pair of separation filter cloths 1 and 8 are wound as described above. It is ejected from the through-hole 9 and is passed through the separation filter cloth 1, the workpiece P, the separation filter cloth 8, and the squeezing belt 15 to the radially outer peripheral side of the separation roll 7. Accordingly, the liquid component squeezed from the object to be processed P is separated from the object to be processed P through the separation filter cloth 8 and the pressing belt 15 together with the ventilation gas A, and is dropped onto the recovery plate 24 and recovered. For this reason, it is possible to achieve a sufficient reduction in the liquid content even with respect to the object to be processed P, which has conventionally been difficult to sufficiently separate.

  And even if the aeration gas A is ejected in this way and the liquid component is separated from the workpiece P, there is a pressing belt on the outer periphery of the other separation filter cloth 8 on the outer peripheral side wound around the separation roll 7. 15 is wound and the workpiece P is pressed together with the separation filter cloth 8, so that the separation filter cloths 1 and 8 are lifted even if the pressure of the aeration gas A is increased in order to increase the liquid removal capability. Thus, the dispersion of the pressure fluid (venting gas A) can be prevented, or the cake can be prevented from being blown out from both ends of the separation filter cloths 1 and 8 in the width direction and from the front and back of the running directions F and G. Therefore, the liquid component can be reliably removed by the ventilation gas A, and the liquid removal effect can be further improved.

  In particular, in the solid-liquid filtration device of the present embodiment, a plurality of vent gas chambers 10 are formed in the inner peripheral portion of the separation roll 7 so as to be separated from each other in the circumferential direction and are formed at substantially equal intervals. An automatic valve 13 is provided in the ventilation pipe 11 that supplies the ventilation gas A and is connected to the A, and a predetermined rotational position of the ventilation gas chamber 10 in the range where the separation filter cloths 1 and 8 are wound. The aeration gas A is continuously supplied only to the aeration gas chamber 10 in FIG.

  For this reason, it is possible to prevent an increase in the supply amount of the aeration gas A, the power for supply, and the running cost by aeration in the part not involved in the liquid removal of the workpiece P. It is possible to more reliably prevent the separation filter cloths 1 and 8 from being lifted up and blown out of the cake before and after the running directions F and G of the cloths 1 and 8, while the part of the separation roll 7 As the automatic valve 13 is sequentially opened and closed with the rotation, it is possible to maintain the state where the aeration gas A is always blown out regardless of the rotation position of the aeration gas chamber 10. It is possible to prompt.

  In order to prevent the separation filter cloths 1 and 8 from being lifted and the cake blown out by the aeration gas A more reliably, the surface pressure of the squeezing belt 15 wound around the separation roll 7 is set to the diameter of the separation roll 7. It is desirable to make the pressure larger than the pressure of the ventilation gas A that flows in the direction (aeration gas pressure). For example, when the aeration gas pressure is 0.4 MPa, the surface pressure of the pressing belt 15 is desirably about 0.5 MPa. And in the solid-liquid separator of the said structure, this surface pressure can also be controlled to a predetermined magnitude | size by adjusting the tension | tensile_strength of the pressing belt 15 with the pressing belt tensioning apparatus 17 mentioned above.

  Moreover, in this embodiment, the air permeability of this squeezing belt 15 is made higher than the air permeability of the separation filter cloths 1, 8, and the liquid component separated from the workpiece P by air ventilation is quickly discharged to It can be recovered from the recovery plate 24 to the tray 21.

  On the other hand, in the filtration device of this embodiment provided with such a solid-liquid separation device on the traveling direction F side of the filter cloth 1 with respect to the filtering means 4, this filter cloth 1 is a pair of separation filter cloths in the solid-liquid separation device. 1 and 8, and the separation roll 7 is one of the plurality of rolls 2 of the filtration device. 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. Moreover, even when the workpiece P from which the liquid is separated is dried in a subsequent drying apparatus, the burden on the drying apparatus can be reduced, and the product is conveyed to such a subsequent drying apparatus. In this case, it is possible to solve problems caused by the adherence of the processing object P having a large amount of liquid to a conveying device such as a belt conveyor or a screw conveyor.

  In the solid-liquid separation device and the solid-liquid separation method, the object P is dehydrated on the outer periphery of the separation roll 7 that rotates as the filter cloth 1 travels as described above. Even if the running of 1 is continuous or intermittent, efficient dehydration can be achieved by the pressing force, shearing force, and ventilation. Therefore, when the separation cloth 7 is rotated continuously or intermittently and the filter cloth 1 travels, 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 any horizontal vacuum filtration apparatus.

  Further, in the solid-liquid separation device of the present embodiment, the filter cloth 1 is further wound around and pressed against the outer periphery of the pair of separation filter cloths 1 and 8 wound around the separation roll 7. Can be brought into close contact with the outer periphery of the separating roll 7 to generate a large frictional force. For this reason, even if this frictional force is reduced by ventilation, the separation roll 7 is integrally rotated in the rotation direction T without causing slippage between the separation roll 7 and the separation filter cloth 1. The filter cloth 1 can be made to travel stably in the traveling direction F.

  Therefore, in the filtration apparatus equipped with such a solid-liquid separation device, the separation roll 7 can be used as the drive roll 2A of the filter cloth 1 in the filtration apparatus as in this embodiment, and a pair of separation filter cloths can be used. Combined with the fact that one of 1 and 8 is shared with the filter cloth 1 of the filter device, it is possible to reduce the equipment cost and the running cost. In particular, such a drive roll 2A requires a certain diameter in order to reliably run the filter cloth 1, whereas the separation roll 7 is also formed with the aeration gas chamber 10 on its inner periphery. Therefore, by sharing these, the other rolls 2, 14, 16 can be made smaller in diameter than the drive roll 2A and the separation roll 7, which is more economical. .

It is a side view which shows the outline of one Embodiment of the filtration apparatus of this invention. It is a side view which shows one Embodiment of the solid-liquid separator of this invention used for the filtration apparatus shown in FIG. It is the partially broken rear view which looked at the solid-liquid separator shown in FIG. 2 from the right side of FIG.

Explanation of symbols

1 Filter cloth (separate filter cloth)
2, 14, 16 rolls 2A drive roll 3 supply means 4 filtration means 7 separation roll 8 separation filter cloth 9 through hole 10 vent chamber 11 vent pipe 13 automatic valve 15 squeeze belt 17 squeeze belt tension device A aeration gas P workpiece F The traveling direction of the filter cloth 1 G The traveling direction of the separation filter cloth 8 The traveling direction of the pressing belt 15 T The rotational direction of the separation roll 7

Claims (6)

A pair of endless separation filter cloths are overlapped and wound around the outer periphery of the separation roll rotated in the circumferential direction, and a squeezing belt is further wound around the outer periphery of the pair of separation filter cloths. The separation filter cloth and the squeezing belt are allowed to travel along the rotation direction of the separation roll, and an object to be treated supplied between the pair of separation filter cloths on the outer periphery of the separation roll. While being sandwiched between separation filter cloths and squeezed by the squeezing belt, aeration gas is blown out to the outer circumference in the radial direction of the separation roll through an aeration gas chamber formed on the inner circumference of the separation roll. The solid-liquid separator is characterized in that it is dehydrated by being carried out.   The solid-liquid separator according to claim 1, wherein the squeezing belt has a higher air permeability than the separation filter cloth.   An object to be processed is supplied from a supply unit 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 unit that is provided closer to the traveling direction of the filter cloth than the supply unit. The solid-liquid separation device according to claim 1 or 2 is disposed closer to the traveling direction side than the filtering means, and of the plurality of rolls, A filtration device characterized in that a roll positioned on the side of the traveling direction from the filtration means is the separation roll, and the filter cloth is one of the pair of separation filter cloths.   The filtration device according to claim 3, wherein the separation roll is a drive roll for running the filter cloth. A pair of endless separation filter cloths are overlapped and wound around the outer periphery of the separation roll rotated in the circumferential direction, and a squeezing belt is further wound around the outer periphery of the pair of separation filter cloths. The filter cloth and the squeezing belt are run along the rotation direction of the separation roll, and the object to be treated supplied between the pair of separation filter cloths is placed between the separation filter cloths on the outer periphery of the separation roll. While being sandwiched and squeezed by the squeezing belt, aeration gas is ejected to the outer circumference in the radial direction of the separation roll through the aeration gas chamber formed in the inner peripheral portion of the separation roll, and then dehydrated. Solid-liquid separation method.   The solid-liquid separation method according to claim 5, wherein a surface pressure of the squeezing belt wound around the separation roll is set larger than an aeration gas pressure that vents in a radial direction of the separation roll.

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