JP6670800B2 - Vacuum filtration device - Google Patents

Description

According to the present invention, a filter cloth which can be moved in a horizontal direction by a driving means is disposed on a vacuum tray, and the slurry supplied on the filter cloth is suctioned through the filter cloth by the vacuum tray. The present invention relates to a horizontal belt filter type vacuum filtration device for filtering .

  As such a horizontal belt filter type vacuum filtration device and vacuum filtration method, for example, in Patent Document 1, a vacuum tray is provided under a filter cloth which is provided so as to be able to travel substantially horizontally on an apparatus body. A vacuum filtration device and a vacuum filter, which are provided so as to be able to advance and retreat along a direction, and filter the slurry supplied on the filter cloth by suctioning the slurry through the filter cloth by a vacuum tray which advances in accordance with the travel of the filter cloth. A filtration method is described.

  Further, in Patent Document 2, a vacuum tray is fixed to the apparatus main body, the traveling of the filter cloth and the vacuum suction are intermittently performed, and the traveling of the filter cloth is stopped while the slurry is being vacuum suctioned, A horizontal belt filter type vacuum filtration device and a vacuum filtration method for filtering a slurry by running a filter cloth when vacuum suction is stopped are described.

Japanese Patent No. 3657550 Japanese Patent No. 3657551

  Such a horizontal belt filter type vacuum filtration device has high cleaning performance specialized in cake cleaning, but on the other hand, because the filtration surface is a horizontal surface, the installation area is large compared to other filtration devices, There is a problem that a large installation area is required to increase the throughput of the slurry. In addition, when installing a plurality of vacuum filtration devices of a horizontal belt filter type in order to increase the amount of slurry treatment, the number of filter cloths and the number of driving means for running the filter cloths increase in addition to an increase in installation area. As a result, management and maintenance become complicated.

  Furthermore, a horizontal belt filter-type vacuum filtration device can perform replacement washing of the filter cake. However, when a substance having poor washing properties such as particles having a porous structure (porous particles) is to be washed, the replacement cake is removed. Cleaning may not be sufficient. In such a case, re-slurry washing (re-pulp washing) of the filter cake is often performed. However, in order to perform re-slurry washing, it is necessary to install a plurality of vacuum filtration devices of a horizontal belt filter type, In addition to the filter-type vacuum filtration device, another type of filter or separator is required, which similarly increases the installation area and the number of filter cloths and drive means.

The present invention has been made under such a background. Therefore, even when the throughput of slurry is increased or reslurry cleaning is performed, the increase in the installation area and the number of filter cloths and driving means are suppressed. It is an object of the present invention to provide a vacuum filtration device of a horizontal belt filter type capable of preventing the problem.

In order to solve the above problems and achieve such an object, a vacuum filtration device of the present invention includes a filter cloth, which can be driven in a horizontal direction by a driving means, disposed on a vacuum tray, A vacuum filtration device for suctioning and filtering the slurry supplied on the cloth through the filter cloth by the vacuum tray, wherein a plurality of the vacuum trays are arranged so as to at least partially overlap in a vertical direction. The filter cloths are arranged so as to extend in the horizontal direction, and are connected to each other so as to be able to advance and retreat in the horizontal direction by one advancing / retreating means. It is characterized by being arranged to be able to run by means.

  In the vacuum filtration device configured as described above, the plurality of vacuum trays are arranged so as to extend in the horizontal direction side by side so as to at least partially overlap in the vertical direction, and between these vacuum trays. Since one filter cloth is provided so as to be able to travel by one driving means, it is possible to secure a large filtration area while suppressing an increase in the installation area of the apparatus, and to increase the throughput of the slurry. be able to.

  On the other hand, if the processing amount of the slurry is the same, the traveling speed of the filter cloth can be reduced, the filtration time from supply of the slurry to discharge thereof can be increased, and the filtration efficiency can be improved. . Furthermore, even if a plurality of vacuum trays are used, only one filter cloth and driving means are required, so that the management and maintenance of the filter cloths and driving means can be simplified as compared with the case where a plurality of vacuum filtration devices are used. Can be achieved.

In addition, since a plurality of vacuum trays are arranged side by side so as to at least partially overlap in the vertical direction, re-slurry of a re-slurried filter cake between these vacuum trays can also be performed by one vacuum filtration. It can be done with the device. That is, in the vacuum filtration method using the vacuum filtration device of the present invention, the filter cake filtered by at least one of the plurality of vacuum trays is reslurried and filtered by at least one other vacuum tray. Therefore, there is no need for another horizontal belt filter type vacuum filtration device, another type of filter, a separator or the like. Here, the reslurry is to reslurry by supplying a reslurry liquid to the filter cake and performing agitation or the like, and the reslurry washing refers to filtering the reslurried slurry again.

  In this case, the filter cake filtered by the at least one vacuum tray is reslurried, and filtered by another at least one vacuum tray on the traveling direction side of the filter cloth of the at least one vacuum tray. Thus, reslurry and filtration can be sequentially and efficiently performed in the running direction of the filter cloth.

  Further, the filter cake is filtered by reslurrying the filter cake filtered by the at least one vacuum tray with a filtrate sucked in a vacuum tray of the at least one vacuum tray on a traveling direction side of the filter cloth. It is possible to reslurry with a relatively clear filtrate sucked by a vacuum tray at a stage subsequent to the vacuum tray, and it is possible to suppress consumption of a cleaning solution (reslurry solution) used for reslurry.

Further, in the vacuum filtration method using the vacuum filtration device of the present invention, the filter cake filtered by at least one vacuum tray among the plurality of vacuum trays is moved in the traveling direction of the filter cloth on the at least one vacuum tray. The replacement washing of the filter cake with the filtrate sucked in the vacuum tray on the side also makes it possible to perform the replacement washing of the filter cake with a relatively clear filtrate.

  On the other hand, in the vacuum filtration device of the present invention, since there is only one filter cloth, this filter cloth is tensioned by a single filter cloth tensioning means between the plurality of vacuum trays, whereby the tension of the entire filter cloth is increased. State can be maintained. Further, in the case of performing the replacement washing of the filter cake as described above, on the filter cloth traveling on the plurality of vacuum trays, a washing unit for replacing and washing the filter cake obtained by filtering the slurry is provided. Just do it.

  Further, when the filter cloth is wound around rollers on the traveling direction side of the plurality of vacuum trays and on the side opposite to the traveling direction, the roller on the traveling direction out of the plurality of vacuum trays is By disposing the upper vacuum tray at a position protruding in the horizontal direction, the device is discharged below the protruding rollers in the traveling direction without increasing the height of the device more than necessary. It is possible to easily secure a space for disposing a conveyor or the like for transporting the filter cake.

In such a vacuum filtering apparatus, is a retractable vacuum tray as described in Patent Document 1 described above, the slurry supplied onto the filter cloth is advanced in accordance with the traveling of the filter cloth There are two types: a vacuum tray that suctions vacuum through a filter cloth through a filter cloth; and a vacuum tray that is fixed to an apparatus body and intermittently performs traveling of the filter cloth and vacuum suction as described in Patent Document 2. However, the vacuum filtration device of the present invention is the former case . In the present invention, since the plurality of vacuum trays are connected to each other and can be moved in and out of the horizontal direction by a single reciprocating means, only one reciprocating means can be used, which is efficient.

  As described above, according to the present invention, the slurry processing amount can be increased without requiring a large installation area or increasing the number of filter cloths or the number of driving means, and can increase the amount of slurry treatment. The reslurry washing of the filter cake can be performed by two horizontal belt filter type vacuum filtration devices.

FIG. 1 is a schematic side view showing a first embodiment of the vacuum filtration device of the present invention. It is an outline side view showing a reference example of a vacuum filtration device of the present invention. It is a schematic side view which shows the modification of embodiment shown in FIG. FIG. 4 is a schematic side view showing a modification of the reference example shown in FIG. 2.

  FIG. 1 shows a first embodiment of the vacuum filtration device of the present invention. In the vacuum filtration device of the present embodiment, a plurality (three stages) of substantially identical and same-sized rectangular box-shaped vacuum trays 1A in which a plurality of vacuum suction chambers are formed in a horizontal direction (left-right direction in FIG. 1). To 1C are arranged so as to extend in the horizontal direction so as to be entirely overlapped in the up-down direction with both ends in the horizontal direction being the longitudinal direction thereof being aligned. Numerous suction holes (not shown) are formed on the upper surfaces of the vacuum suction chambers of the vacuum trays 1A to 1C.

  In the present embodiment, the vacuum trays 1A to 1C are connected to each other by a tray connecting member 2 on at least one side in the horizontal direction (both ends in FIG. 1), and the wheels 3 attached to a frame (not shown). , Respectively, so that they can move forward and backward in the horizontal direction. Further, in this embodiment, a cylinder device 4 as one advancing / retracting means in this embodiment is connected to the lowermost vacuum tray 1C, and the plurality of vacuum trays 1A to 1C are integrally formed by the cylinder device 4 in a predetermined manner. It is possible to reciprocate in a horizontal direction with a stroke.

  Further, an entrance roller 5A and an exit roller 5B are disposed outside each of the vacuum trays 1A to 1C in the horizontal direction, and a pressing roller is provided on the vacuum trays 1A to 1C on the entrance roller 5A side. 5C is provided. In this embodiment, the horizontal positions of the entrance roller 5A, the exit roller 5B, and the pressing roller 5C are aligned with each other in the plurality of vacuum trays 1A to 1C.

  Further, below the lowermost vacuum tray 1C, a pair of tension rollers 6A and 6B as one filter cloth tensioning means 6 in the present embodiment is disposed on the exit roller 5B side of the vacuum tray 1C. At the same time, a return roller 7 is disposed outside the entrance rollers 5A of the middle and lower vacuum trays 1B and 1C in the horizontal direction. The filter cloth tensioning means 6 has the tension rollers 6A and 6B arranged stepwise, and by adjusting the horizontal distance between the tension rollers 6A and 6B, the entry roller 5A, The tension of the filter cloth 8 wound around the exit roller 5B, the pressing roller 5C, and the return roller 7 is adjusted.

  The entrance roller 5A, the exit roller 5B, the holding roller 5C, the tension rollers 6A and 6B, and the return roller 7 are rotatable about a rotation axis that extends vertically and horizontally in the longitudinal direction of the vacuum trays 1A to 1C. And one long endless roller for each of the entrance roller 5A, the exit roller 5B, and the press roller 5C, and the tension rollers 6A, 6B, and the return roller 7 of each of the vacuum trays 1A to 1C. A belt-shaped filter cloth 8 is wound around the belt-like filter cloth 8 so that the belt-like filter cloth 8 can travel in a traveling direction indicated by reference numeral F in the figure.

  Here, the rotation axis of the entrance side roller 5A and the pressing roller 5C is located above the upper surface of each of the vacuum trays 1A to 1C, and the rotation axis of the exit side roller 5B is the upper surface of each of the vacuum trays 1A to 1C. It is located below. On the upper surface side of each of the vacuum trays 1 </ b> A to 1 </ b> C, the filter cloth 8 is wound around the lower edge of the pressing roller 5 </ b> C from the upper edge of the entrance roller 5 </ b> A, and moves toward the traveling direction F. It extends along the upper surface of 1C and is wound around the delivery roller 5B.

  In addition, the filter cloth 8 wound around the output rollers 5B of the upper and middle vacuum trays 1A and 1B passes under the vacuum trays 1A and 1B and is opposite to the upper surface side. , And are wound around the entrance rollers 5A of the middle and lower vacuum trays 1B and 1C, respectively. Further, the filter cloth 8 wrapped around the outlet roller 5B of the lower vacuum tray 1C extends below the vacuum tray 1C, passes through the tension rollers 6A and 6B of the filter cloth tensioning means 6, and returns to the return roller 7B. And is returned to the entrance roller 5A of the upper vacuum tray 1A. Therefore, in the present embodiment, the filter cloth 8 performs filtration while traveling from the upper vacuum tray 1A to the lower vacuum tray 1C, and circulates so as to be returned to the upper vacuum tray 1A again.

  Further, one of the entrance roller 5A, the exit roller 5B, the pressing roller 5C, and the return roller 7 of each of the vacuum trays 1A to 1C is provided with an electric motor (not shown) as one driving unit in the present embodiment. Are connected via a speed reducer, and the driving means causes the filter cloth 8 to travel. Here, in the present embodiment, this one driving unit is connected to the exit roller 5B of the lowermost vacuum tray 1C.

  In addition, above the filter cloth 8 traveling on each of the vacuum trays 1A to 1C, on the opposite side to the traveling direction F of the filter cloth 8 and closer to the traveling direction F than the holding roller 5C, Supply means 9A to 9C for supplying the slurries SA to SC to the filter cloth 8 at positions closer to 5C for each of the vacuum trays 1A to 1C are provided. Further, above the filter cloth 8 running on each of the vacuum trays 1A to 1C, the slurry SA to SC supplied on the filter cloth 8 is filtered to a certain extent substantially at the center of the vacuum trays 1A to 1C in the longitudinal direction. Washing means 10A to 10C are provided to supply the washing liquids WA to WC to the filter cakes CA to CC generated by the above and supply the washing liquids to the vacuum trays 1A to 1C for replacement washing.

  Furthermore, the vacuum suction chambers of the vacuum trays 1A to 1C are connected to suction means (not shown) such as a vacuum pump for filtering the slurry supplied on the filter cloth 8 through the filter cloth 8 and sucking the filtrate. In this embodiment, the vacuum suction pipes 11A to 11C are connected via flexible tubes and the like that follow the advance and retreat of the vacuum trays 1A to 1C. Further, a scraper 12 for peeling off the filter cakes CA to CC attached to the filter cloth 8 is provided at the lower edge of the outlet roller 5B of each of the vacuum trays 1A to 1C. Transport conveyors 13 for transporting the filtered cakes CA to CC respectively are provided. Further, a cleaning device 14 for cleaning by spraying cleaning water on the filter cloth 8 from which the filter cakes CA to CC have been peeled off, on the side in the traveling direction F of the filter cloth 8 below the scrapers 12 below the vacuum trays 1A to 1C. Is provided.

  As described above, the filter cakes CA to CC that have been filtered by the vacuum trays 1A to 1C, separated from the filter cloth 8 by the scraper 12, and transported by the transport conveyor 13 are collected together and subjected to a process such as drying. In this embodiment, the filter cakes CA and CB filtered by the upper vacuum tray 1A and the middle vacuum tray 1B are transported to reslurries 15A and 15B, respectively, and reslurries LB and LC are supplied. And re-slurry.

In the vacuum filtration method using the vacuum filtration device of the present embodiment, the re-slurried filter cakes CA and CB re-slurry the filter cake filtered by at least one of the plurality of vacuum trays 1A to 1C. Is filtered by at least one other vacuum tray. Specifically, the filter cake CA filtered by the upper vacuum tray 1A and reslurried by the reslurry tank 15A is applied to the filter cloth 8 on the middle vacuum tray 1B in the running direction F of the upper vacuum tray 1A. The filter cake CB supplied and supplied from the supply means 9B as the SB and filtered by the middle vacuum tray 1B and reslurried by the reslurry tank 15B is a lower vacuum tray in the running direction F side of the middle vacuum tray 1B. The slurry SC is supplied from the supply means 9C to the filter cloth 8 on 1C and filtered.

  Furthermore, in the present embodiment, the filter cake filtered by at least one vacuum tray among the plurality of vacuum trays 1A to 1C is suctioned by the vacuum tray on the traveling direction F side of the filter cloth 8 of the at least one vacuum tray. The slurry is reslurried by the filtrate. Specifically, the filter cake CA filtered by the upper vacuum tray 1A is re-slurried in a re-slurry tank 15A in which a part of the filtrate sucked from the slurry SB by the middle vacuum tray 1B located in the traveling direction F is reslurried. Is re-slurried by being supplied as a re-slurry liquid LB to the filter cake CB filtered by the middle vacuum tray 1B, and the filtrate sucked from the slurry SC by the lower vacuum tray 1C located in the traveling direction F side. A part is re-slurried by being supplied as a re-slurry liquid LC to a re-slurry tank 15B for re-slurry.

  Further, in the present embodiment, the filter cake filtered by at least one vacuum tray among the plurality of vacuum trays 1A to 1C is sucked by the vacuum tray on the traveling direction F side of the filter cloth 8 of the at least one vacuum tray. The filtrate is replaced and washed. Specifically, the filter cake CA filtered by the upper vacuum tray 1A is the remaining of the filtrate sucked from the slurry SB by the middle vacuum tray 1B located on the traveling direction F side from the cleaning means 10A as the cleaning liquid WA. The filter cake CB supplied and replaced and washed by the middle vacuum tray 1B is washed with the remaining vacuum filtrate 1C from the slurry SC by the lower vacuum tray 1C located in the traveling direction F side as the washing liquid WB. It is supplied from the means 10B and subjected to replacement cleaning.

  In this embodiment, the filtrate LA sucked from the slurry SA by the upper vacuum tray 1A is processed without being used for reslurry or replacement cleaning. Further, as the washing liquid WC supplied from the washing means 10C to the filter cake CC filtered by the lower vacuum tray 1C, water or the like which is clearer than the filtrate is used. Further, the filter cake CC filtered by the lower vacuum tray 1C is transported and processed as it is.

  In the vacuum filtration device of the present embodiment configured as described above, the filter cloth 8 is continuously run in the running direction F by the driving means and circulates as described above, and the vacuum trays 1A to 1C supply The slurry SA to SC supplied from the means 9A to 9C to the side opposite to the traveling direction F of the filter cloth 8 on the vacuum trays 1A to 1C is suctioned through the filter cloth 8 by the suction means and filtered. It advances in synchronization with the filter cloth 8 and the running direction F. The vacuum trays 1A to 1C may be advanced by the cylinder device 4 in synchronization with the filter cloth 8.

  Further, when the vacuum trays 1A to 1C reach their forward stroke ends, the suction by the suction means is released at the same time, and at the same time, the vacuum trays 1A to 1C are pulled back by the cylinder device 4 to the reverse stroke ends opposite to the running direction F. Again, the slurry SA to SC is moved forward in synchronization with the filter cloth 8 while being filtered by suction. Further, the filter cakes CA to CC from which the slurries SA to SC supplied on the filter cloth 8 are filtered are separated by the scraper 12 from the traveling direction F side as the filter cloth 8 travels, and are discharged to the transport conveyor 13. You.

  In the vacuum filtration device and the vacuum filtration method having the above-described configurations, the plurality of vacuum trays 1A to 1C for filtering the slurries SA to SC are arranged so as to extend in the horizontal direction so as to at least partially overlap in the vertical direction. Therefore, it is possible to secure a large filtration area while suppressing an increase in the installation area of the apparatus. For this reason, even if the installation area is limited, it is possible to increase the throughput of the slurries SA to SC.

  On the other hand, by increasing the filtration area in this way, if the processing amount is the same, the traveling speed of the filter cloth 8 can be slowed and the filtration time can be extended, so that efficient filtration can be performed. Becomes Further, even if a plurality of vacuum trays 1A to 1C are used, only one filter cloth 8 and one driving means are required in the vacuum filtration device and the vacuum filtration method having the above-described configuration. For example, a plurality of vacuum filtration devices are used. Thus, the management and maintenance of the filter cloth 8 and the driving means can be simplified as compared with the case where the same filtration area is secured.

  Further, in the vacuum filtration device of the present embodiment, since the filter cloth 8 is one sheet, only one filter cloth tensioning means 6 for adjusting the tension by tensioning the filter cloth 8 may be used. Further, in the present embodiment, as described above, the vacuum trays 1A to 1C can be advanced and retracted in the horizontal direction by the advance and retreat means such as the cylinder device 4, but these vacuum trays 1A to 1C are connected by the tray connecting member 2. Since they are connected to each other, only one advance / retreat means is required. Therefore, management and maintenance of the filter cloth tensioning means 6 and the advancing / retreating means can be simplified.

  Moreover, in the present embodiment, the driving means is connected to the output roller 5B around which the filter cloth 8 running on the lowermost vacuum tray 1C is wound, and the filter cloth tensioning means 6 is connected to the lowermost vacuum tray 1C. It is disposed below 1C, and the reciprocating means (cylinder device 4) is also connected to the lowermost vacuum tray 1C. For this reason, even if a plurality of vacuum trays 1A to 1C are arranged side by side so as to be overlapped in the vertical direction, management and maintenance of these driving means, filter cloth tensioning means 6, and advancing / retracting means may be work at high places. And further simplification can be achieved. Further, since the vacuum trays other than the lowermost vacuum tray 1C are not provided with the driving means and the filter cloth tensioning means 6, etc., the vacuum trays other than the lowermost vacuum tray 1C are provided for each stage. The number of stages can be easily increased or decreased.

On the other hand, by using such a vacuum filtration device, in the vacuum filtration method using the vacuum filtration device of the above-described embodiment, the filtration is performed by the upper vacuum tray 1A among the plurality of vacuum trays 1A to 1C as described above. The obtained filter cake CA can be reslurried and filtered by the middle vacuum tray 1B, and the filter cake CB filtered by the middle vacuum tray 1B can be reslurried and filtered by the lower vacuum tray 1C.

  That is, between a plurality of vacuum trays 1A to 1C in one vacuum filtration device, the filter cake filtered by at least one vacuum tray can be reslurried and filtered by another at least one vacuum tray, so that washing is performed. A slurry containing particles having a poor porous property (porous particles) can be sufficiently washed, and the slurry obtained by reslurry of the filter cake as described above is filtered by another horizontal belt filter type vacuum filtration. There is no need for equipment or other types of filters, separators, etc.

  In the present embodiment, in order to reslurry the filter cake in this manner, the filter cake CA filtered by the upper vacuum tray 1A is reslurried, and the traveling direction of the filter cloth 8 with respect to the upper vacuum tray 1A. The filter cake CB filtered by the other one of the middle vacuum trays 1B located on the F side, and the filter cake CB filtered by the one of the middle vacuum trays 1B is reslurried. Filtration is performed by another lower vacuum tray 1C located in the traveling direction F side. Accordingly, the slurries SA to SC are sequentially filtered and reslurried in the traveling direction F of the filter cloth 8 to be efficiently processed, and the finally filtered filter cake CC is, in this embodiment, a lower vacuum tray 1C in the present embodiment. Is discharged from

  Further, in the present embodiment, in order to reslurry the filter cake in this way, the filter cake CA filtered by the upper vacuum tray 1A is located on the traveling direction F side of the filter cloth 8 with respect to the upper vacuum tray 1A. A part of the filtrate sucked by the middle vacuum tray 1B is used as a reslurry liquid LB to be reslurried, and the filter cake CB filtered by the middle vacuum tray 1B is filtered by the filter cloth 8 for the middle vacuum tray 1B. A part of the filtrate sucked by the lower vacuum tray 1C located on the traveling direction F side is used as the reslurry liquid LC and reslurried.

  Therefore, the filter cake is re-slurried by the relatively clear filtrate with respect to the filter cake sucked by the subsequent vacuum trays 1B and 1C located on the traveling direction F side of the filtered vacuum trays 1A and 1B, respectively. Therefore, efficient reslurry can be performed without newly supplying a reslurry liquid to the vacuum filtration device for reslurry.

  In the present embodiment, the filter cakes CA to CC are also subjected to replacement washing on the plurality of vacuum trays 1A to 1C. In this replacement washing, the filter cake CA filtered on the upper vacuum tray 1A is also replaced with the filter cake CA. Of the filtrate sucked by the middle vacuum tray 1B located on the traveling direction F side of the upper vacuum tray 1A, the remaining filtrate other than a part of the filtrate used as the reslurry liquid LB is used as the washing liquid WA, The filter cake CB filtered by the middle vacuum tray 1B is also used as the reslurry liquid LC among the filtrate sucked by the lower vacuum tray 1C located on the traveling direction F side of the middle vacuum tray 1B. The remaining filtrate excluding the above filtrate is used as the washing liquid WB.

  Therefore, even in this replacement washing, the filter cake remains relatively clear with respect to the filter cake sucked by the subsequent vacuum trays 1B and 1C located on the traveling direction F side of the filtered vacuum trays 1A and 1B, respectively. Since the washing is performed by the filtrate and only the washing liquid WC for washing the filter cake CC filtered by the lower vacuum tray 1C needs to be newly supplied to the vacuum filtration device for the displacement washing, the consumption amount of the washing liquid Can be suppressed, and replacement washing can be performed efficiently. In order to perform such replacement cleaning, cleaning means such as a spray nozzle for supplying cleaning liquids WA to WC to a substantially central portion in the longitudinal direction of the vacuum trays 1A to 1C as in the vacuum filtration device of the present embodiment. What is necessary is just to provide 10A-10C, respectively. Further, in FIG. 1, each of the vacuum trays 1A to 1C is provided with one cleaning unit 10A to 10C, but a plurality of cleaning units 10A to 10C may be provided on the vacuum trays 1A to 1C. Thereby, a higher cleaning effect can be obtained.

Next, FIG. 2 shows a reference example of the vacuum filtration device of the present invention, and the same reference numerals are assigned to portions common to the first embodiment shown in FIG. In the first embodiment, while a plurality of vacuum trays 1A~1C were retractable in a horizontal direction by the cylinder device 4 as moving means, in this reference example, a plurality of vacuum trays 1A~1C is the frame , And there is no advance / retreat means. In this case, the plurality of vacuum trays 1A to 1C do not need to be connected by the tray connecting member 2, and the vacuum trays 1A to 1C and the vacuum suction pipes 11A to 11C are usually connected without a flexible tube or the like. May be connected by a rigid pipe.

In the vacuum filtration device of such a reference example , the filter cloth 8 provided on the plurality of vacuum trays 1A to 1C and supplied with the slurries SA to SC is driven at a predetermined pitch (for example, for one vacuum suction chamber). The width and width of the traveling direction F) intermittently repeat traveling and stopping, and the suction means stops suction while the filter cloth 8 is traveling, and removes the filter cloth 8 while the filter cloth 8 is stopped. The filtrate is sucked from the slurries SA to SC through the filter to perform filtration.

And also in the vacuum filtration device of this reference example , the plurality of vacuum trays 1A to 1C are arranged vertically one above the other so as to at least partially overlap in the horizontal direction. Since one filter cloth 8 is arranged so as to be able to travel by one driving means, it is possible to keep the installation area of the apparatus large and to secure a large filtration area as in the first embodiment. Can be obtained.

Further, FIGS. 3 and 4, which respectively show a modification of the first embodiment and the reference example, parts in common with those first embodiment and reference example by arranging the same reference numerals is there. In the first embodiment and the reference example , the horizontal position of the entrance roller 5A, the exit roller 5B, and the pressing roller 5C of the plurality of vacuum trays 1A to 1C are aligned with each other. In the modified example, the delivery roller 5B located on the traveling direction F side of the filter cloth 8 on the vacuum trays 1A to 1C is disposed at a position where the upper one of the plurality of vacuum trays 1A to 1C projects more horizontally. Have been.

  That is, as shown in FIGS. 3 and 4, the exit roller 5B located on the traveling direction F side of the middle vacuum tray 1B is higher than the exit roller 5B located on the traveling direction F side of the lower vacuum tray 1C. The exit roller 5B, which is disposed at a position protruding in the traveling direction F in the horizontal direction and is located on the traveling direction F side of the upper vacuum tray 1A, is located on the exit side located on the traveling direction F side of the middle vacuum tray 1B. It is disposed at a position further protruding in the traveling direction F side than the roller 5B in the horizontal direction.

With the vacuum filtration device of the modified example configured as described above, the same effect as that of the first embodiment and the reference example can be obtained, and of course, the output roller 5B from which the filter cake is discharged toward the upper vacuum tray. Is located at a position protruding in the horizontal direction, so that a large space can be secured below the exit roller 5B. For this reason, even if the plurality of vacuum trays 1A to 1C are arranged so as to overlap in the vertical direction and extend in the horizontal direction, the height of the vacuum filtration device is not increased unnecessarily, and the output side roller is provided. It becomes easy to arrange the conveyor 13 below 5B, and it is possible to keep the installation space of the vacuum filtration device low even in the height direction. In the first embodiment and the modification of the reference example , when it is not necessary to perform reslurry washing of the filter cakes CA and CB, the filter cakes CA and CB are transported below the outlet rollers 5B of the upper and middle vacuum trays 1A and 1B. Without the conveyor 13, a transport conveyor 13 and a cake chute extending horizontally below the outlet rollers 5 </ b> B of the upper vacuum tray 1 </ b> A are disposed below the outlet rollers 5 </ b> B of the lowermost vacuum tray 1 </ b> C. Thus, the filter cakes CA to CC discharged from the vacuum trays 1A to 1C of each stage may be discharged collectively.

  If the outlet roller 5B is disposed at a position protruding in the horizontal direction toward the upper vacuum tray, there is a gap between the upper vacuum tray and the outlet roller 5B. Therefore, the vacuum suction chamber may be extended to this space so that the upper vacuum tray becomes longer in the longitudinal direction. In this case, the plurality of vacuum trays partially overlap in the vertical direction.

In the case where the plurality of vacuum trays 1A to 1C, the entrance roller 5A, the exit roller 5B, and the pressing roller 5C are supported by a frame as in the first embodiment, the reference example, and the modifications thereof, The frame has a strength capable of being independently independent as a separate body for each of the upper, middle, and lower vacuum trays 1A to 1C and its inlet roller 5A, outlet roller 5B, and press roller 5C. Is desirably assembled and integrated at the installation site of the vacuum filtration device in consideration of transportation of the device.

Further, in the first embodiment , the reference example, and the modifications thereof, the slurry SB obtained by reslurrying the filter cake CA obtained by filtering the slurry SA by the upper vacuum tray 1A is filtered by the middle vacuum tray 1B. The slurry SC obtained by reslurrying the filter cake CB filtered by the tray 1B is filtered by the lower vacuum tray 1C. However, the filter cloth 8 on each of the vacuum trays 1A to 1C has the same or non-resurrected filter cloth. In some cases, different types of slurries may be supplied. Further, in the first embodiment , the reference example, and the modifications thereof, the number of vacuum trays 1A to 1C is three, but the number may be two or four or more.

1A to 1C Vacuum tray 2 Tray connecting member 4 Cylinder device (advance / retreat means)
5A Inlet roller 5B Outlet roller 5C Holding roller 6 Filter cloth tensioning means 7 Return roller 8 Filter cloth 9A to 9C Supply means 10A to 10C Cleaning means 11A to 11C Vacuum suction pipe 13 Transport conveyor 15A, 15B Reslurry tank F Filter cloth 8 Running direction of SA-SC slurry CA-CC filter cake WA-WC washing liquid LA filtrate LB, LC reslurry liquid

Claims (4)

A filter cloth which can be driven in a horizontal direction by a driving means is disposed on a vacuum tray, and the slurry supplied on the filter cloth is suctioned by the vacuum tray through the filter cloth to filter the slurry. A filtration device,
A plurality of the vacuum tray, while being disposed to extend horizontally aligned so as to at least partially overlap in the vertical direction, which is a retractable horizontally by one moving means being connected to each other,
A vacuum filtration device, wherein one filter cloth is arranged so as to be able to run by one driving means between these vacuum trays.   The vacuum filtration device according to claim 1, wherein the filter cloth is tensioned by a single filter cloth tensioning means between the plurality of vacuum trays.   The washing means for washing a filter cake on which the slurry has been filtered is provided on each of the filter cloths running on the plurality of vacuum trays, respectively. Vacuum filtration equipment. The filter cloth is wound around a roller on the side opposite to the traveling direction of the plurality of vacuum trays and the traveling direction,
4. The roller according to claim 1, wherein the roller on the traveling direction side is disposed at a position protruding in the horizontal direction as the upper vacuum tray among the plurality of vacuum trays. 5. The vacuum filtration device according to 1.

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