JP2689065B2 - Separation module - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to solid solution components (SS (suspended solids)) having relatively different specific gravities.
And it is filtered stock solution containing minute), filtered and the separation of mixed solution with a specific gravity difference, relates to the separation module for use in concentrating.

[0002]

2. Description of the Related Art Conventionally, as a separation module of this type, a cylindrical ceramic filter is coaxially fitted in a cylindrical casing so as to form a filtrate chamber with the cylindrical wall, and There is known a filtration module in which a nozzle communicating with the filtrate chamber is provided at both ends of a casing. This filtration module is used, for example, in a circulation-type filtration device that returns the stock solution in the tank to the tank through the stock solution passage of the ceramic filter via a circulation pump, and cross-flow filters the stock solution.

[0003]

However, in the above-mentioned conventional separation module, the whole amount of the undiluted solution to be filtered flows into the module, so that the ceramic filter is clogged at an early stage and, depending on the components contained in the undiluted solution, the ceramic filter may be clogged. Sometimes, the stock solution passage was blocked.
Therefore, back pressure cleaning (back cleaning) of the ceramic filter must be performed frequently, and the filtration flux becomes unstable, but sometimes filtration becomes impossible. Further, as the filtration was repeated, the concentration of the stock solution increased and the filtration efficiency decreased. Therefore, an object of the present invention is to provide a separation module capable of increasing the backwash interval, stabilizing the filtration flux, and improving the filtration efficiency.

[0004]

In order to solve the above-mentioned problems, the separation module of the present invention is such that a filtrate chamber is formed between a vertical cylindrical casing and the cylindrical wall in the casing. A ceramic filter fitted coaxially,
A nozzle provided at both ends of the casing in communication with the filtrate chamber, a liquid cyclone integrally provided at the lower end of the casing in communication with the lower end of the stock solution passage of the ceramic filter and an overflow port, and the outflow of concentrated stock solution. In order to reduce the amount, a slightly opened solenoid valve provided at the concentrated stock solution outlet at the upper end of the casing is provided.

[0005]

In the above means, the casing of the ceramic filter and the liquid cyclone are integrated in the vertical direction ,
Moreover, before the SS content and the specific gravity in the stock solution flow into the stock solution passage of the ceramic filter, they are concentrated by the liquid cyclone,
Half of the undiluted solution that has been classified and further removed of SS and specific gravity
The total amount of Ru is filtered. The ceramic filter is preferably made of high-purity alumina ceramics, and preferably has an asymmetric membrane structure in which the open pore diameter is gradually increased from the inner side which is the filtration surface, and is cylindrical or prismatic having a large number of undiluted solution passages. Things are used.

[0006]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 and FIG. 2 are a front view and a side view, respectively, in a half section showing an embodiment of the separation module of the present invention. This separation module 1 has a vertical cylindrical casing 3 made of stainless steel having flanges 2 on both ends, and in this casing 3, a hexagonal shape having a large number of stock solution passages 4 penetrating in the axial direction. The columnar ceramic filter 5 is coaxially fitted so as to form a filtrate chamber 7 between the columnar ceramic filter 5 and the cylindrical wall of the casing 3 via ring-shaped support fittings 6 attached to the flanges 2 at both ends. . Ceramic filter 5
Is made of high-purity alumina ceramics and has an asymmetric membrane structure in which the open pore diameter gradually increases from the inner surface side of each stock solution passage 4 serving as the filtration surface to the outer side, and the inner surface side thin The open pore diameter is 0.1 μm.

Further, nozzles 8 and 9 communicating with the filtrate chamber 7 are provided on the cylindrical walls at both ends of the casing 3, respectively. The upper nozzle 8 is mainly used as an outlet for the filtrate, while the lower nozzle 9 is mainly used as an inlet for the cleaning liquid or compressed air for backwashing. Further, at the lower end of the casing 3, a liquid cyclone 10 integrally provided with the support fitting 6 is continuously provided, and the liquid cyclone 10 is composed of a cylindrical portion 11 and a conical portion 12 connected to the cylindrical portion 11. There is. Hydrocyclone 10
Is provided with a stock solution inlet 13 through which the stock solution flows tangentially on the cylinder wall of the cylindrical portion 11, and the upper end opening of the cylindrical section 11 is used as an overflow port 14 to form the ceramic filter 5.
While communicating with one end (lower end in FIG. 1) of each of the stock solution passages 4, the lower end opening of the conical portion 12 serves as an under blow port 15. Incidentally, the upper end of the casing 3 through the top and communicating of each concentrate passage 4 of the ceramic filter 5, concentrated
Are the reduced stock solution outlet 16, this concentrated stock solution outlet 16, the solenoid valve is provided for throttling the outflow concentrated stock solutions as described below so as to be small.

The separation module 1 having the above structure is used by incorporating it into a semi-total filtration device as shown in FIG. 3, for example. This semi-total filtration apparatus has a pump 17 for supplying the stock solution to the separation module 1, and a stock solution supply passage 18 connecting a discharge port of the pump 17 and a stock solution inlet 13 of the liquid cyclone 10 has a first The first electric valve 19 is inserted, and the pressure switch 20 and the first pressure gauge 21 are branched and connected in front of and behind the first electric valve 19. The underflow port 15 of the liquid cyclone 10 is provided with the second electric valve 22.
Is connected to a bucket strainer 24 via a concentrated liquid discharge path 23. Bucket strainer 24
It is for separating the concentrated solution into a stock solution and a slurry,
A stock solution outlet 25 for discharging the separated stock solution and slurry
A drain port 26 is provided, and for washing the bucket strainer 24 by squeezing out a slurry component,
A compressed air inlet 27 is provided.

The nozzle 8 above the casing 3 has
A second pressure gauge 28 is branched and connected, and a filtrate delivery passage 31 is connected in which a first electromagnetic valve 29 and a flowmeter 30 are inserted in order from the casing 3 side. And the lower nozzle 9
Is connected to a pressure source such as a compressor via a compressed air passage 32. In the compressed air passage 32, a second electromagnetic valve 33 and a level switch 34 are sequentially inserted from the pressure source side. Further, an exhaust passage 36 having a third solenoid valve 35 interposed therein is branched and connected to the compressed air passage 32 between the second solenoid valve 33 and the level switch 34. On the other hand, the concentrated stock solution outlet 16 of the casing 3 is connected to the bucket strainer 24 via a concentrated stock solution discharge passage 38 in which a fourth electromagnetic valve 37 is inserted. In FIG. 3, reference numeral 39 denotes a valve communicating with the filtrate chamber 7, which is a drain port of the filtrate chamber 7 of the module 1.

In order to filter the stock solution to be filtered using the above semi-total filtration device, the first electric valve 19, the first solenoid valve 29 and the fourth solenoid valve 37 are opened (the fourth solenoid valve is slightly opened), The pump 17 is driven to supply the stock solution to be filtered to the separation module 1. The stock solution that has flowed into the separation module 1 is first separated into SS and the specific gravity in the hydrocyclone 10 and settled in the lower part thereof, while the low specific gravity and the solution are discharged from the overflow port 14 into the stock solution passage 4 of the ceramic filter 5. And is cross-flow filtered. Then, the filtrate is sent from the filtrate chamber 7 through the filtrate delivery path 31 to the required location, while a small amount of concentrated undiluted solution is concentrated undiluted solution discharge path 38.
And is discharged to the bucket strainer 24, where it is separated into the stock solution and the slurry, and the stock solution outlet 25 and the drain port 2 are separated.
Exhausted from 6. When the filtration efficiency of the ceramic filter 5 is reduced due to the cross flow filtration, the pump 17
Stop the first electric valve 19 and close the second electric valve 2
2 is opened and the second solenoid valve 33 is opened / closed, and the compressed air from the pressure source applies pulse pressure to the secondary side (filtrate chamber) to backwash the ceramic filter 5. As the ceramic filter 5 is backwashed, S in the hydrocyclone 10
Concentrate containing S component or the like is discharged to the bucket strainer 24, and is discharged when the concentration stock solution and are separated in the stock and the slurry fraction in the same manner from a stock solution outlet 25 and drain outlet 26. In addition, in order to prevent the bucket strainer 24 from being clogged, SS components and the like are squeezed out periodically by the compressed air from the compressed air inlet 27 for cleaning.

Here, when the electric discharge machining fluid was filtered with a backwashing interval of 10 minutes and a backwashing water amount of 21 using a semi-total filtration device having a membrane area of 0.6 m 2, almost all the clogging on the membrane surface was recovered. In addition, the filtration rate was perfect, and a stable filtration flux was obtained without increasing the concentration rate on the primary side (in the hydrocyclone) even with total filtration. When the ceramic filter had a pore size of 0.1 μm, the stock solution with a liquid temperature of 28 to 34 ° C. was filtered at an average filtration pressure of 0.9 kgf / cm 3, and the cylinder was backwashed once every 5 minutes. The relationship between the filtration fluxes is as shown in FIG. 4, which also shows the conventional relationship. Therefore, in the cyclone-type separation module according to the present invention, it can be seen that the filtration flux can be stabilized.

[0012]

As described above, according to the separation module of the present invention, the casing of the ceramic filter and the liquid cyclone are integrated in the vertical direction, and the S in the undiluted solution is integrated.
Before the S component and the heavy specific gravity component flow into the undiluted liquid passage of the ceramic filter, they are concentrated and classified by the liquid cyclone , and
In addition, since the undiluted solution from which the SS content and the heavy specific gravity are removed is semi-totally filtered , space can be saved, and the obstruction of the undiluted solution passage of the ceramic filter is eliminated, and the primary side undiluted solution is overconcentrated. And the clogging of the asymmetric filtration membrane of the ceramic filter can be reduced. Therefore, the back pressure washing interval can be made longer than before, and the filtration flux can be stabilized. Furthermore, half
Through the whole-volume filtration, it is possible to increase the throughput or treatment efficiency .

[Brief description of the drawings]

FIG. 1 is a half sectional front view showing an embodiment of a separation module of the present invention.

FIG. 2 is a side view of the separation module shown in FIG.

FIG. 3 is a flow diagram of a semi-total amount filtration device using the separation module shown in FIG.

FIG. 4 is an operation explanatory view of the separation module shown in FIG.

[Explanation of symbols]

3 Casing 4 Undiluted solution passage 5 Ceramic filter 7 Filtrate chamber 8 Nozzle 9 Nozzle 10 Hydrocyclone 13 Undiluted solution inlet 14 Overflow port 15 Underflow port 16 Concentrated undiluted solution outlet 37 Fourth solenoid valve

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Takashi Ogawa, Takashi Ogawa, Aichi Prefecture, No. 1 Minamito, Ogakie-cho, Toshiba Ceramics Co., Ltd., Kariya Plant (56) References JP-A-62-294410 (JP, A) JP-A-56 -26503 (JP, A) JP 62-79821 (JP, A) JP 59-199014 (JP, A)

Claims (1)

(57) [Claims] 1. A vertical cylindrical casing, a ceramic filter coaxially fitted in the casing so as to form a filtrate chamber between the cylindrical wall and the casing, and the ceramic filter being communicated with the filtrate chamber. A nozzle provided at both ends of the casing, a liquid cyclone integrally provided at the lower end of the casing by connecting the lower end of the undiluted liquid passage of the ceramic filter and the overflow port, and the upper end of the casing for reducing the outflow amount of the concentrated undiluted liquid. A separation module, comprising: a slightly opened electromagnetic valve provided at the concentrated stock solution outlet.