JP2003136098A - Slurry draining and washing apparatus and method for draining and washing slurry - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a slurry draining and washing apparatus capable of realizing high treatment efficiency, and a method for draining and washing a slurry. SOLUTION: The slurry draining and washing apparatus is equipped with a slurry treatment group wherein two or more slurry treatment parts capable of housing the slurry and equipped with filters are respectively arranged in a mutually independent state and a means group provided in relation to the slurry treatment group and having a draining means for sucking and filtering the slurries housed in the slurry treatment parts through the filters and a washing means for supplying a washing liquid to the treatment parts after drainage to wash off residue and sucking and filtering the washed mixtures in the treatment parts through the filters. The slurry treatment group is relatively moved with respect to the means group so that the respective slurry treatment parts are passed in the order of the draining means and the washing means to drain and wash the slurries housed in the slurry treatment parts.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device and method for removing liquid from a slurry, and more particularly to a technique for removing liquid from the slurry and cleaning it to obtain a clean solid.

[0002]

2. Description of the Related Art Generally, various devices such as a drum filter, a filter press, a decanter, and a centrifuge have been used for dewatering and washing operations from a slurry. For example, in the deliquoring of zeolite produced from coal ash, it is required to recover and utilize an alkaline solution and to highly deliquify it in order to reduce the load of washing, while achieving good solid-liquid separation. A high recovery rate is also required at the same time. Further, it is also required to efficiently wash and remove the residual alkaline solution in a short time while suppressing the amount of the cleaning liquid used.

According to the above-mentioned conventional separation device, even if it has a high performance in terms of liquid removal rate, it is insufficient in terms of recovery rate or treatment efficiency.

[0004]

Therefore, according to the present invention,
It is an object of the present invention to provide an apparatus and method for removing liquid from a slurry, which can realize high processing efficiency in removing and cleaning the slurry.

[0005]

In order to solve the above-mentioned problems, the inventors of the present invention have conducted research by focusing on subdividing the processing unit of the slurry and performing continuous processing. It has been found that the above-mentioned problems can be solved by individually and continuously carrying out the deliquoring-washing step with respect to the slurries housed in these slurry processing sections by providing a plurality of slurry processing sections having the present invention. completed. That is, according to the present invention, the following means are provided.

(1) A slurry dewatering / cleaning apparatus, which is independent of each other, is capable of accommodating the slurry, and has two or more slurry processing sections provided with a filter and a slurry processing section group, The following means, which are provided in association with the slurry processing unit group, include: a liquid removing unit that suction-filters the slurry contained in the slurry processing unit through the filter to suck the slurry in the processing unit; Supplying a cleaning liquid to the treatment section to wash the residue, and a means group having a washing means for suction-filtering the washing mixture in the treatment section through the filter, and a means group having: The slurry contained in the slurry processing unit is moved by moving the respective slurry processing units relative to the means group so that the liquid removing unit and the cleaning unit are passed in this order. A device that drains and cleans liquid. (2) The means group further includes means for supplying a slurry to the slurry processing unit, and the slurry processing unit is relatively moved in the order of the slurry supply unit, the liquid removing unit, and the cleaning unit. (1) The device according to the above. (3) The device according to (1) or (2), wherein the means group has two or more cleaning means arranged. (4) The liquid removing means and / or the cleaning means is provided with a gas impermeable or semipermeable sheet capable of coating the liquid level of the contents in the slurry processing section during suction filtration. ) To (3). (5) Two or more kinds of filtrates produced by cleaning the two or more slurry processing parts by the two or more cleaning means are
The apparatus according to (3), which is stored in a plurality of places according to the cleanliness and is supplied as a cleaning liquid for the upstream cleaning means.

(6) A method for removing liquid from a slurry, wherein each slurry processing section of a slurry processing section group is made up of two or more slurry processing sections which are independent of each other and each have a filter and can store the slurry. And the following steps continuously; (a) a step of supplying the slurry to the slurry processing section;
(B) a deliquoring step of suction-filtering the slurry through the filter, and (c) a cleaning liquid is supplied to the residue after the deliquoring to wash the residue, and the cleaning mixture is aspirated through the filter. Performing a washing step of filtering. (7) The slurry processing unit is continuously supplied to the operation area of the step (a), the step (a) is performed for each of the slurry processing units, and the slurry processing unit after the step (a) is performed. The method according to (6), wherein the steps (b) and (c) for the contents are carried out in the respective operating areas. (8) The (c) step operation area is provided with at least two step execution positions at which the step (c) can be performed, and the slurry processing unit is sequentially moved to these (c) step execution positions, The method according to (7), wherein the step (c) is repeated at least twice for the slurry processing section. (9) The step (a) for each of the slurry processing units,
The method according to any one of (6) to (8), wherein the cycle times of the step (b) and the step (c) are synchronized.

According to these means, the slurry is divided into a plurality of processing units, and the liquid removing and washing steps are continuously carried out for each processing unit. Therefore, the continuous execution improves the processing efficiency. Further, by adjusting the dewatering and washing process conditions for the slurry processing section, it is possible to easily obtain high processing efficiency in addition to the required dehydration rate and recovery rate.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described in detail below. The slurry dewatering cleaning method of the present invention,
For each slurry processing part of the slurry processing part group consisting of two or more slurry processing parts each independently having a filter and capable of containing a slurry, the following steps are continuously performed: (a) In the slurry processing part A step of supplying a slurry,
(B) a deliquoring step of suction-filtering the slurry through the filter, and (c) a cleaning liquid is supplied to the residue after the deliquoring to wash the residue, and the cleaning mixture is aspirated through the filter. The washing step of filtering is performed. In addition, the slurry dewatering device of the present invention is a preferred device for carrying out the above method, and two or more slurry processing units that are independent of each other and that can each contain slurry and that are equipped with a filter are arranged. And the following means provided in association with this slurry processing section group: a slurry contained in the slurry processing section is suction-filtered through the filter to suck the slurry in the processing section. A means group having a liquid means and a cleaning means for supplying a cleaning liquid to the treatment section after drainage to wash the residue and suction-filtering the washing mixture in the treatment section through the filter. , The slurry processing unit group is relatively moved with respect to the unit group so that each slurry processing unit passes through the liquid removing unit and the cleaning unit in this order, thereby The slurry accommodated in the over processing unit deliquored is for washing. In these inventions, the purpose is to separate the solid from the slurry, and both the solid and the liquid in the slurry can be recovered.
Further, various kinds of slurries can be targeted. For example, as a solid component, various zeolites, pigments,
Dye, gypsum, aluminum hydroxide, graphite, slurry containing titanium compounds, okara, bean jam, potatoes, food-based slurry containing pet food ingredients, paper pulp,
Pulp-based slurries such as fibers and pulp slurries, and various sludge slurries such as sewage sludge, general sludge and construction sludge can be targeted. The method and apparatus of the present invention are particularly preferably applied to solid-liquid separation of zeolite-containing alkaline slurry obtained in the coal ash zeolite production process. This is because the zeolite particles are fine particles and have a bulk specific gravity close to that of water, and it is generally difficult to dehydrate by centrifugation, and high dehydration and solid-liquid separation with high recovery rate are required.

(Slurry Draining Method) (Slurry Treatment Section Group) The dewatering / washing step of the present invention is a slurry treatment consisting of two or more slurry treatment sections which are independent of each other and each of which is equipped with a filter and can contain a slurry. It is carried out for each slurry processing part of the group. That is,
In the present invention, the slurry is divided into two or more processing units by being accommodated in two or more slurry processing units, and each step is performed in each of the divided processing units. After the cleaning step, the subsequent steps such as the step of discharging the solid matter in the slurry processing section and the cleaning step of the slurry processing section may be performed for each processing unit.

The slurry processing section can store a slurry. The shape of the container for containing the slurry is not particularly limited. It may have a flat plate shape or a dish shape as long as it can accommodate the slurry, or a pan shape having a predetermined depth as necessary. Further, it may be provided with a lid.

The slurry processing section has a filter. The filter is preferably provided on at least a part of the bottom of the slurry processing section. Since the slurry processing unit is provided with the filter, the suction filtration of the slurry can be performed in the slurry processing unit, and the liquid removal cleaning process can be continuously performed. For the filter, it is possible to use various filter materials provided with pores through which the liquid in the slurry can pass and the solid components cannot pass. Specifically, a filter cloth, which is a mesh-like body composed of woven or knitted fabrics made of various fibers, a screen made of metal or resin, a mesh plate body such as a porous body, a porous body such as porous ceramics, and beads. Examples thereof include a column packed with the like. As the filter cloth, a filter cloth having an appropriate pore size (mesh size) is used in consideration of the particle diameter of the solid portion, the suction pressure, and the like. The material of the filter cloth is not particularly limited.

These may be used alone or in combination of two or more, but at least a filter cloth is preferably used, and more preferably, a filter cloth and a mesh plate body are used in combination. In this case, by using the mesh plate body, it is possible to secure uniform suction from the filter surface during suction. This is because the interposition of the mesh plate body secures a space through which the sucked liquid can move.
At the same time, the mesh plate also functions as a support for the filter cloth. In particular, it is preferable that the filter material (particularly filter cloth) is provided so as to be replaceable. For example, the filter cloth may be placed on a mesh plate body, a porous body, or the like, and may be used in combination with other filter materials, and may be detachably provided from this filter material. When the filter material is replaceable, the yield is high and the filtrate can be easily discharged depending on the characteristics of the slurry. In addition, it is preferable that the bottom of the slurry processing unit is provided with a plate having a hole for suction connected to a suction unit connected to a suction source.

In the slurry processing section group, the respective slurry processing sections are independent of each other. Here, being independent of each other means that the slurries can be individually housed and suction and filtration can be individually carried out. Therefore, as long as they are mutually independent in this sense, the slurry processing units may be formed in any form in the slurry processing units.
It is preferable that the slurry processing units are arranged in the slurry processing unit group from the viewpoint of efficient implementation of each process. As an arrangement form, it is preferable that at least two or more slurry processing units are continuously arranged in one direction.

Therefore, for example, as a form of connecting and arranging, the partitions are divided into two or more along one direction so that the slurries can be individually accommodated, and the partitions are formed to have a filter at the bottom of each partition. The whole body can be a slurry processing group. In this case, each partition part corresponds to a slurry processing part. Further, as another example, a plurality of pan-shaped bodies having a filter at the bottom may be connected in a tandem shape. In addition, there may be mentioned a slurry processing section group in which the bread-like body is arranged on a conveying means such as a rail or a conveyor. Preferably,
The large number of slurry processing units are arranged in an endless shape. According to such an array form, slurry supply, liquid removal,
A series of steps of cleaning, discharging, and cleaning of the slurry processing part can be repeatedly and efficiently performed.

The above-mentioned steps (a) to (c) are continuously carried out on the slurry of each slurry processing section of the slurry processing section group thus constructed. That is, the steps (a) to (c) are performed on the first slurry processing unit, and the steps (a) to (c) are sequentially performed on the second and subsequent slurry processing units. Carry out. According to the present invention, each step is carried out for each slurry unit housed in the slurry processing section, so that scattering and outflow of the slurry component to the surroundings can be prevented. Further, in the present invention, since all steps are completed in the slurry processing section,
There is no migration of slurry or solids between processing steps. Therefore, the loss of solid components is small, and it is easy to secure a high recovery rate. Furthermore, according to the characteristics of the slurry, such as the concentration and supply amount of the slurry, the cleaning liquid amount and the cleaning method,
Process conditions can be set. Furthermore, since the slurry is processed in divided units, solid-liquid separation with uniform recovery rate and dehydration rate can be achieved.

In the method of the present invention, since the deliquoring / washing step can be carried out in units of the slurry processing section, these steps can be carried out in parallel for each processing section. As a result, the processing time from the slurry supply to the solid content discharge can be shortened. In order to perform these steps in parallel at the same time, the slurry treatment section is continuously supplied to the operation area of the step (a), and the step (a) is performed for each of the slurry treatment sections. ) The above (b) and (c) for the contents of the slurry processing section after the step
It is preferable to carry out the steps in the operating area of each step. According to this aspect, it is possible to easily realize continuous and simultaneous process execution. In the present invention, since each process can be carried out individually in the slurry processing unit, by moving the slurry processing unit to the implementation area of each process,
Such an embodiment can be easily adopted.

Further, the step (c) step execution region is provided with at least two step execution positions at which the step (c) can be executed, and the slurry processing section is sequentially moved to these step (c) step execution positions. Thus, the step (c) can be repeated at least twice for the slurry processing section. According to this aspect, the cleaning process can be efficiently repeated. Therefore, the cleanliness and the dehydration rate can be easily adjusted without reducing the working efficiency. In this case, the cleaning waste liquid from the plurality of slurry processing units can be stored in a plurality of locations according to the cleanliness thereof and used as a cleaning liquid for the cleaning process of the previous stage. Thereby, the amount of the cleaning liquid used can be reduced, and the cleaning cost can be reduced.

Further, it is preferable that the cycle times of the step (a), the step (b), and the step (c) for each of the slurry processing sections are synchronized. With this configuration, each process can be efficiently and continuously performed on all the slurry processing units in operation. In particular, when each process is performed in each process operation area, the movement timing of the slurry processing unit is synchronized, and automatic operation becomes possible.

In the method of the present invention, it is also possible to carry out the steps for the slurry processing section without performing the steps in the respective process execution areas and without moving the slurry processing section. In any case, in relation to the slurry processing section group in which the slurry processing sections are arranged, at least a means group for carrying out each of the steps (b) to (c) is provided, and a slurry is provided. Relative movement of the treatment unit group with respect to the means group so that each slurry treatment unit passes through the order of (a) step execution means (liquid removal means) and (b) step execution means (cleaning means). Thus, the slurry contained in the slurry processing section can be drained and washed. By adopting such a means configuration, it is possible to efficiently and continuously perform the dewatering / washing process both when the slurry processing unit is moved and when it is not moved. it can. Hereinafter, the apparatus of the present invention having the present means configuration will be described.

(Slurry Drainage Cleaning Apparatus) The slurry processing apparatus of the present invention comprises the above-mentioned slurry processing section group and means group. The means group supplies at least the slurry contained in the slurry processing unit, a liquid removing unit that suction-filters the slurry in the processing unit through the filter, and a cleaning liquid is supplied to the processing unit after the liquid removal. And a cleaning means for suction-filtering the cleaning mixture in the processing section through the filter.

The liquid removing means is a suction means capable of sucking the inside of the processing section through the filter of the slurry processing section. Various conventionally known suction means can be used. For example,
The suction means may be connected to a vacuum suction source.
It is preferable to provide a filtrate (washing waste liquid) storage part in the middle of the filtrate suction path of the suction means. Further, it is preferable to provide a suction chamber provided on the lower surface side of the filter so as to be detachable in a closed state capable of vacuum suction. To seal the chamber and the bottom of the slurry processing unit, it is preferable to provide a sealing material on the upper surface side of the chamber.

The cleaning means has a suction means capable of sucking the inside of the processing section through the filter of the slurry processing section, and a cleaning solution supply means for supplying the cleaning solution to the slurry processing section. As the suction means, the same suction means as the liquid removing means can be adopted. The cleaning liquid supply means is not particularly limited. Any liquid supply means capable of supplying a predetermined amount may be used. For example, it can be a reservoir for the cleaning liquid and an injection means connected to this reservoir.

The liquid removing means and the cleaning means are provided with a gas impermeable or semipermeable sheet capable of coating the liquid level of the contents in the slurry processing section in order to improve the efficiency of suction filtration. This sheet is placed on the liquid surface so as to cover the liquid surface of the contents in the processing section during suction filtration. Specifically, it is formed so as to be vertically movable with respect to the liquid surface in the processing section by being connected to the vertical movement driving means.
If the processing unit can move up and down, the processing unit may move up and down with respect to the fixed sheet. In addition, this sheet is effective for high dehydration, and it is particularly preferable to be used by being provided in the final step of the liquid removing means and / or the cleaning means.

The material of this sheet is not particularly limited, but it is preferable that the sheet itself be able to float on the liquid surface, and more preferably, it is flexible enough to follow the liquid surface. This is because by being floatable with respect to the liquid surface, the liquid surface is covered, the sheet position can be lowered in accordance with the liquid surface drop due to suction filtration, and a preferable vacuum suction state can always be maintained. In addition, if it is flexible enough to follow the liquid surface, the vacuum state can be reliably maintained. Such sheets include, for example, polyvinyl chloride,
A sheet made of synthetic resin such as polyamide or polyethylene can be used.

The apparatus may be provided with a slurry supply means. The slurry supplying means can be provided separately from the means group or can be provided as a part of the means group. As a slurry supply means, various conventionally known means can be used. Usually, a certain amount of slurry is supplied from the slurry supply tank into the processing section by opening and closing the discharge valve. Preferably, the tank comprises
Slurry processing unit One unit of slurry is always provided. Further, the present apparatus may further include means for discharging the solid content from the slurry processing unit after cleaning and means for cleaning the inside of the slurry processing unit after discharging the solid content. These means can also be provided as part of the means group.

Among the above means, the means group having at least the liquid removing means and the cleaning means are arranged so that the liquid removing step and the cleaning step can be performed in order on the slurry processing section of the slurry processing section group. Has been done. Then, the slurry processing unit group can be moved relative to the means group so that each slurry processing unit passes through the liquid removing unit and the cleaning unit in this order. That is,
When the slurry processing unit group is moved with respect to the means group, the means group is fixedly arranged in the order of steps, and the part where each means is arranged becomes the step execution area. By moving the slurry processing unit group in the arrayed state, each process is performed for each slurry processing unit in each implementation area. On the other hand, when the means group is moved with respect to the slurry processing section group, the slurry processing section group is fixedly arranged, and arranged so that each step can be carried out in order, and a movable means group is formed. By moving with respect to the array of slurry processing units, each process is performed on each slurry processing unit, and in the slurry processing unit, each means arrives in order and each process is performed. .

In order to carry out each process continuously and concurrently by such relative movement, the group on the moving side is conveyed by a conveying means such as a rail or a conveyor, or one end of a large number is combined with a rotary shaft. It is preferable to use a carrier means that supports and rotates each arm provided with each processing unit or means at the other end of these arms. This is because it is easy to synchronize the fixed position with respect to the transfer means and the cycle time of each process. Further, by incorporating means for carrying out the solid content discharging step and the slurry processing section cleaning step after the deliquoring / washing step into the means group, all steps can be performed continuously and concurrently. . By arranging the slurry processing unit group so as to be movable in an endless shape, such a process can be performed at low cost.

Further, the cleaning means included in the means group preferably comprises two or more in series. By having a plurality of cleaning means, the cleaning means of two or more steps can be easily carried out continuously. Further, the cleaning waste liquid can be reused in a configuration in which the cleaning waste liquid in the cleaning waste liquid storage section attached to the cleaning device is supplied to the cleaning liquid supply device of the previous cleaning device.

FIG. 1 shows an embodiment of the apparatus of the present invention, which comprises a slurry processing section group and a means group. In this embodiment, a plurality of slurry processing units 4 are movably mounted on a chain conveyor 8 to form a slurry processing unit group 2 having an endless edge array. In the present embodiment, the chain conveyor 8 conveys along one direction while holding the filter of the slurry processing unit 4 so as to be horizontal, and supports the slurry processing unit 4 in the inverted state at the conveyor end 8a. At the other end 8b,
It is configured to hold the slurry processing unit 4 in a horizontal state. On the other hand, the means group 12 includes a slurry supply means 14, a slurry dewatering means 18, a slurry cleaning means 22,
Solid content discharging means 26 and slurry processing section cleaning means 30
Is equipped with. Hereinafter, the details of each step of the method of the present invention will be described with reference to this apparatus configuration.

(Slurry Supplying Step) First, the slurry is supplied to the slurry processing section 4. The slurry processing unit 4 is
It is conveyed by the chain conveyor 8 and is sequentially sent out to the slurry supply step implementation area, that is, the location where the slurry supply means 14 is arranged. The inside of the slurry processing unit 4 that has been transported to the slurry supply step has already been cleaned. In this embodiment, as shown in FIG. 2, the slurry processing unit 4 is a pan-shaped container 4a, and the bottom plate 5 has a hole for vacuum suction (in this embodiment, an elongated slit in the center of the bottom plate). 5a is formed on the bottom plate 5, and a mesh-shaped body 6 made of stainless steel and a filter cloth 7 are laminated on the bottom plate 5.
The filter cloth 7 is detachably attached on the mesh-like body 6 and can be easily replaced.

In the present embodiment, the slurry supplying means 14 is
A certain amount of slurry is supplied from the slurry supply tank 16 into the processing section 4 by opening and closing the discharge valve. Preferably, the tank 16 is always equipped with one unit of slurry for the slurry processing unit. The amount of slurry for one unit is determined in consideration of the type of slurry, the dehydration rate to be obtained, and the processing capacity. Although it depends on the powder characteristics of the solid content in the slurry, the amount of the slurry is preferably such that the solid content remains at a height of about 10 mm to about 40 mm after the liquid is removed. This is because if it is less than 10 mm, the efficiency is poor, and if it exceeds 40 mm, the pressure loss becomes too large and a suction time is required. The zeolite-containing alkaline slurry obtained in the step of producing zeolite from coal ash has a solid content concentration of approximately 10 to 10.
It is 30 wt%, and the present apparatus and method can be preferably applied to the zeolite-containing slurry having the solid content concentration. The slurry processing unit 4 to which a predetermined amount of slurry has been supplied is driven at a predetermined timing and by a predetermined movement amount of the chain conveyor 8, that is, the next step, that is, a liquid removing step (a liquid removing step in which a liquid removing means is arranged). Transported to the implementation area). At the same time, an empty slurry processing unit 4 is newly supplied to the slurry supply step.

(Slurry deliquoring step) In the deliquoring step, the liquid is suction-filtered from the slurry. A deliquoring means 18 is arranged in the deliquoring process operation area. In the present embodiment, the suction means 18 is installed at a portion corresponding to the transport fixed position of the slurry processing unit 4 by the chain conveyor 8. In the present embodiment, the suction means is composed of a suction chamber 20 connected to the vacuum suction source 19 and a filtrate storage section 21 provided in the middle of the suction path. The upper surface side of the suction chamber 20 is provided with a suction hole 20a that can be evacuated, and a seal portion 20b that is airtightly adhered to the lower surface side of the filter of the slurry processing unit 4. The suction chamber 20 is brought into close contact with the lower surface of the slurry processing unit 4 and the vacuum suction source 19 is operated, whereby the liquid in the slurry is filtered by the filter cloth 7 and the suction holes 5a, 20.
It flows down to the suction chamber 20 via a. The filtrate further moves from a discharge port provided near the bottom of the chamber 20 to the reservoir 21 and is stored therein. When it is desired to increase the dehydration rate, as described above, the sheet S can be placed on the liquid surface of the slurry to enhance the suction effect. In this case, the sheet S supply means may be arranged as a part of the means group 12.

As described in the slurry supplying step, it is preferable that this step is carried out so that the solid content thickness after deliquoring is about 10 mm to about 40 mm. The suction pressure is preferably 0.02 to 0.06 MPa, and when the slurry surface is covered with a sheet, about 0.03 to about 0.
06 MPa, and when not covered with a sheet, about 0.
It shows from 02 to about 0.04 MPa. This is because if it is below the respective lower limits, the efficiency is poor and the dehydration rate is lowered, and if it is above the upper limit, the suction time becomes long or a large suction device is required.

After performing suction with a predetermined suction force for a predetermined time,
The valve 19a is operated to release the airtightness by the seal portion 20b, and the suction chamber 20 is separated from the lower surface of the slurry processing portion 4. Next, at a predetermined timing, the slurry processing unit 4 that has completed the deliquoring process is moved to the cleaning process by driving the chain conveyor 8 by a predetermined amount.

(Slurry Washing Step) In the washing step, a washing liquid such as water is supplied to the residue after draining, and then the liquid is suction-filtered from the washing mixture. A cleaning means 22 is arranged in the cleaning process execution area. In this form,
The four cleaning means 22a to 22d are arranged in series along the arrangement direction of the chain conveyor 8. The suction means 23a, 23b include a suction chamber having the same configuration as the suction means 19 in the liquid removing means. Therefore, the same numbers are attached in FIG. In this embodiment, the suction means 19 in the liquid removing means is different in that one vacuum suction source 23a, 23b and one storage portion 24a, 24b are provided for two adjacent suction chambers 20. . In addition, the two cleaning means 22c and 22d on the rear stage side
The cleaning waste liquid generated from the
It is adapted to be supplied to the cleaning liquid supply means 25a, 25b in the preceding stage. The cleaning means 22a to 22d further include cleaning liquid supply means 25a to 25d. In this embodiment, a predetermined amount can be supplied to the slurry processing unit 4 from a predetermined cleaning liquid storage unit 25e via these supply units 25a to 25d.

In the cleaning step, the cleaning liquid and / or the cleaning waste liquid generated in the subsequent cleaning step can be supplied to the residue in the slurry processing section, and then the solid content can be cleaned by suction filtration. The suction and the movement of the filtrate are the same as in the liquid removal step. Similarly, when it is desired to increase the dehydration rate or cleanliness, the sheet S can be placed on the liquid surface of the cleaning mixture to enhance the suction effect. In this case, the sheet S supply means may be arranged as a part of the means group 12. Furthermore, when it is desired to improve the cleanliness, one cleaning means may repeat the cleaning step two or more times. After supplying a predetermined amount of cleaning liquid and performing suction with a predetermined suction force for a predetermined time, the airtightness by the seal portion 20b is released, and the suction chamber 20 is separated from the lower surface of the slurry processing portion 4. Next, at a predetermined timing, the slurry processing unit 4 that has completed the cleaning process is moved to the next cleaning process by driving the chain conveyor 8 by a predetermined amount.

(Solid Content Discharging Step) The slurry processing section 4 which has carried out all the washing steps in this way is driven intermittently by the chain conveyor 8 at a predetermined timing.
As it is moved, it reaches the solid content discharging process implementation area, that is, the installation position of the discharging means 26. In this embodiment, the discharging means that utilizes the fact that the slurry processing section 4 is inverted at the end 8a of the conveyor 8 is adopted. The discharging means is not limited to such a reversing operation, and may be one of various conventionally known means such as discharging by applying vibration or shock, or discharging by a scraper or the like. Alternatively, two or more kinds can be used in combination.

(Slurry processing section cleaning step) Further, by intermittently driving the chain conveyor 8 at a predetermined timing, a cleaning step of the slurry processing section, that is, a cleaning step execution area in which the cleaning means 30 of the processing section is arranged. The slurry processing unit 4 is reached. As the cleaning means 30 for the processing section, various conventionally known means can be adopted. In this embodiment, a cleaning liquid such as water is supplied into the slurry processing unit 4 by jetting or the like, and the residue is removed all at once by the pressure and the water flow. In particular, in this embodiment, the slurry processing unit 4 is in the inverted state, so that cleaning is easy. In this form, it is preferable that a plurality of cleaning means 30 be provided. Further, it is preferable that a drying unit such as a blower is provided in addition to the cleaning unit.

Further, instead of this form, a cleaning tank 32 in which the slurry processing section 4 can be moved can be adopted. This form is illustrated in FIG. The slurry processing unit 4 moves in the cleaning tank 32 with the opening of the slurry processing unit 4 facing downward to settle the solid matter attached to the bottom and side surfaces of the slurry processing unit 4, It can be deposited on the bottom of the cleaning tank 32. These deposits may be discharged as needed. In particular, by causing the opening edge of the slurry processing unit 4 to move near the bottom of the cleaning tank 32, the deposit is moved in the moving direction of the slurry processing unit 4 as the slurry processing unit 4 moves. be able to. By providing the deposit discharge part or the accumulation part 33 at the destination (downstream side of the process), the inside of the cleaning tank can be constantly maintained in a state suitable for cleaning. Further, the solid matter can be collected without waste by storing and transporting this deposit, and appropriately using it as a part or all of the slurry supplied to the slurry processing section 4 to perform solid-liquid separation again. .

After the cleaning process of the slurry processing unit is completed, the slurry processing unit 4 is moved at a predetermined timing, and again.
The slurry is sent to the operation area of the slurry supply step, and the above-described steps are repeatedly performed.

In the above description, the structure for moving the processing means group 2 has been described. However, the structure for moving the processing means group 12 by a conveying means such as a conveyer is only opposite to the moving side. The process contents can be carried out in exactly the same manner.

As described above, by relatively moving the slurry processing section group and the means group, the solid-liquid separation step of the slurry can be performed continuously and concurrently.
With this configuration, automatic operation is easy, and production efficiency can be dramatically improved. Also, the dehydration efficiency,
Recovery efficiency can also be easily increased without incurring energy costs.

According to the common general technical knowledge in this field, those skilled in the art drive the slurry processing section group in which the slurry processing section in the present invention is arranged, and the means group in which each process execution means is arranged. In addition to the above description, various modifications can be easily created, and the present invention also includes such modifications and modifications. Further, according to the present invention, a method and an apparatus for removing liquid from a slurry having the following constitution are also provided. That is, having a filter portion, in the container-shaped slurry processing portion capable of containing the slurry, the step of supplying the slurry, the state of placing a gas impermeable or semipermeable sheet on the slurry surface, And a step of sucking from the lower surface side of the filter part. In addition, at the same time, a container-shaped slurry processing unit that has a filter unit and can store slurry, and a gas impermeable or semi-permeable sheet that can be placed on the surface of the slurry stored in the processing unit, A means for depositing a sheet on the surface of the slurry, and a liquid removing apparatus for slurry are provided. In these inventions, the gas-impermeable or semi-permeable sheet can employ the various aspects of the gas-impermeable or semi-permeable sheet in the embodiment of the present invention as they are. Further, the above-mentioned various aspects of the slurry processing section can be directly adopted.

[0045]

EXAMPLES Hereinafter, specific examples of the present invention will be described. It should be noted that these specific examples are for better explaining the present invention and do not limit the present invention.

(Example 1) A coal ash zeolite slurry having a solid content concentration of 20 wt% and a NaOH concentration of 1.3 N produced by a coal ash zeolite production plant was treated as a pan-like slurry having a diameter of 200 mm and a height of 65 mm. About 1L
Supplied. After the slurry was supplied, the suction liquid removal process of the slurry processing section was performed. In the suction liquid removal step, the suction time was 6 seconds. The pressure during suction was 0.022 MPa. A cake having a thickness of 15 mm was obtained by this deliquoring process. In the washing step, 1 L of 29 ° C. water was sprinkled, and the suction time was 11 seconds. The pressure during suction was 0.037 MPa.
The cake obtained by repeating this washing process 8 times in total (total amount of washing water 8 L) had a residual water content of 58.7 wt%. The pH of the 5 wt% slurry prepared after the cake was dried was 11.15.

(Example 2) Of the cleaning steps of Example 1,
Cleaning waste liquid from the 5th to 8th cleaning steps (total volume approx. 4
L, pH 11.96, water temperature 28.8 ° C) was collected. After carrying out the deliquoring step under the same conditions as in Example 1,
In each of the first to fourth washing steps, each washing step was performed under the same conditions as in Example 1 except that each 1 L of the collected washing waste liquid was used. Further, in the fifth to eighth washing steps, as in the case of Example 1, each washing step was performed with clean water under the same conditions as in Example 1. The finally obtained cake had a residual water content of 56.40 wt%. Further, the pH when the 5 wt% slurry was prepared after the cake was dried was 11.51.

(Example 3) In Example 1, in the deliquoring step, the slurry having the same diameter as that of the slurry treatment portion was formed on the surface of the slurry.
A thin nylon sheet having a thickness of 00 mm was floated and suction-dewatered under the same conditions, and the suction time was 10 seconds. The suction pressure at this time was increased to 0.06 MPa. Furthermore, the washing step was performed under the same conditions as in Example 1. The residual water content of the finally obtained cake was 43.1 wt%.

Example 4 In order to investigate the relationship between the type of sheet used in the dewatering step and the residual water content of the cake, various sheets as shown in Table 1 were used to carry out the dewatering step. did. That is, in Example 1, in the liquid removal step, various sheets shown in Table 1 were placed on the surface of the slurry, floated, and suction-dewatered for 10 seconds. As a result, the suction pressures shown in Table 1 were obtained. Furthermore, the washing step was performed under the same conditions as in Example 1. The residual water content of the finally obtained cake is also shown in Table 1.

[Table 1] As shown in Table 1, it was found that when the sheet area is large, the pressure shown at the time of suction is obtained and the residual water content is also low. It was also clarified that the higher the pressure shown during suction, the lower the residual water content.

As is clear from the above results, according to the drainage cleaning method of the present invention, it is possible to efficiently perform drainage cleaning of various slurries including coal ash slurry and achieve a high dehydration rate. all right. In particular, it was found that a cake having a residual water content of about 40 to about 45 wt% can be obtained regardless of the initial water content.

[0051]

According to the present invention, it is possible to provide an apparatus and method for removing liquid from a slurry, which can realize high processing efficiency.

[Brief description of drawings]

FIG. 1 is a diagram showing an embodiment of the present invention.

FIG. 2 is a plan view of one embodiment of a slurry processing unit of the present invention.

FIG. 3 is a cross-sectional view of the slurry processing unit shown in FIG.

FIG. 4 is a diagram showing another embodiment of the present invention.

[Explanation of symbols] 2 Slurry processing group 4 Slurry processing section 8 Transport means (chain conveyor) 12 means group 14 Slurry supply means 18 Slurry dewatering means 19 Vacuum suction source 19a valve 20 suction chamber 21 Filtrate storage 22a, 22b, 22c, 22d Slurry cleaning means 23a, 23b Vacuum suction source 24a, 24b Cleaning waste liquid storage section 25a, 25b, 25c, 25d Cleaning liquid supply means 25e Cleaning liquid reservoir 26 Slurry discharging means 30 Slurry processing unit cleaning means 32 washing tank 33 Accumulation department S sheet

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) B01D 29/04 530D 29/36 Z 29/38 510A 530B (72) Inventor Shunzo Sakai Minato-ku, Nagoya City, Aichi Prefecture Shinchaya 5 chome 3011 Ltd. ▲ Kichi ▼ T-terms in Tetsudo Works (reference) 4D059 AA02 AA03 AA08 AA09 BE06 BE14 BK05 BK06 CB05 CB17 CB27 EA16 EB16

Claims (9)

[Claims] 1. A slurry dewatering / cleaning apparatus, which is independent of each other, is capable of accommodating the slurry, and has two or more slurry processing sections provided with a filter, and a slurry processing section group. The following means arranged in association with the processing section group: a liquid removing means for suction-filtering the slurry contained in the slurry processing section through the filter to suck the slurry in the processing section; Supply a cleaning liquid to clean the residue,
A means group having a cleaning means for suction-filtering the cleaning mixture in the processing part through the filter, and, and the slurry processing part group, in which the slurry processing parts are the liquid removing means and the cleaning means in this order. An apparatus that removes and cleans the slurry contained in the slurry processing section by moving the slurry relative to the means group so as to pass therethrough. 2. The means group further comprises means for supplying a slurry to the slurry processing section, and the slurry processing section is relatively moved in the order of the slurry supplying means, the liquid removing means, and the cleaning means. The device of claim 1, wherein 3. An apparatus according to claim 1 or 2, wherein said means group comprises two or more of said cleaning means arranged in an array. 4. The liquid removing means and / or the cleaning means is provided with a gas-impermeable or semi-permeable sheet capable of coating the liquid level of the contents in the slurry processing section during suction filtration. The device according to claim 1. 5. For cleaning the upstream cleaning means, two or more kinds of filtrates produced by cleaning the two or more slurry processing parts by the two or more cleaning means are stored at a plurality of locations according to their cleanliness. The device according to claim 3, which is supplied as a liquid. 6. A slurry dewatering and washing method, wherein each slurry processing unit of a slurry processing unit group is made up of two or more slurry processing units which are independent of each other and each have a filter and can store the slurry. The following steps are continuously performed; (a) a step of supplying the slurry to the slurry processing section;
(B) a deliquoring step of suction-filtering the slurry through the filter, and (c) a cleaning liquid is supplied to the residue after the deliquoring to wash the residue, and the cleaning mixture is aspirated through the filter. Performing a washing step of filtering. 7. The slurry treatment unit is continuously supplied to an operation area of the step (a), the step (a) is performed for each of the slurry treatment units, and the slurry treatment after the step (a) is performed. The method according to claim 6, wherein the steps (b) and (c) for the contents of the parts are carried out in the respective operating areas. 8. The step (c) step execution area is provided with at least two step execution positions capable of executing the step (c),
By sequentially moving the slurry processing unit to these (c) process execution positions, at least two (c) processes are repeatedly performed on the slurry processing unit,
The method of claim 7. 9. The (a) for each of the slurry processing units.
The method according to claim 6, wherein the cycle times of the step, the step (b), and the step (c) are synchronized.