JP3184797B2 - Mixing equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mixing apparatus, and more particularly, to crushing and dispersing a powder mass generated in a processing liquid when powder is supplied to a liquid and dispersed and / or dissolved. And / or a dissolving mixing device.

[0002]

2. Description of the Related Art In water treatment such as wastewater treatment, an operation of adding a polymer flocculant to wastewater in which a suspended matter such as sludge is suspended, to precipitate the suspended matter is often performed. Since the polymer flocculant is often in the form of a powder, it is usually added to the wastewater in which the suspension is suspended after the polymer flocculant is once dispersed and dissolved in a liquid such as water. Conventionally, a dispersing / dissolving apparatus shown in FIG. 5 has been used as a dispersing / dissolving apparatus for dispersing and / or dissolving powder in a liquid. In this dispersing / dissolving apparatus, after opening a valve 212 to store a predetermined amount of liquid 200 in a tank 202, a predetermined amount of powder 204 is supplied to the liquid 200, and a propeller-like stirring section 208 of a stirring apparatus 206 is rotated. By stirring and stirring, the powder is dispersed and dissolved in the liquid. According to such a dispersing / dissolving apparatus, it is possible to supply a predetermined amount of the liquid 200 and a predetermined amount of the powder 204 into the tank, and disperse and / or dissolve the powder in the liquid. Therefore, a processing liquid in which the powder 204 is uniformly dispersed and / or dissolved in the liquid 200 can be added to the wastewater through the valve 214.

However, when a large amount of powder 204 is supplied to the liquid 200 at one time, a powder mass composed of powder
In some cases, so-called joint powder (mamako) is generated, and the powder cannot be dispersed and / or dissolved in the liquid. When the disintegration of the flour is performed by stirring of the stirrer 206, an extremely long stirring is required. For this reason, after scooping out the generated flour, the shortage is replenished and added to wastewater. The generation of such relay powder can be prevented by adding the powder 204 little by little to the liquid 200. However, since the time for adding the powder 204 becomes long, it cannot be industrially adopted.

[0004] The present inventor considered that it is effective to efficiently crush the generated flour in order to efficiently disperse and / or dissolve the powder in the liquid. In the specification of Japanese Patent Application No. 7-36449, it is proposed that the mixing device 120 shown in FIG. 7 can be connected to the outlet pipe of the tank 202 to effectively crush the recycle powder and disperse and / or dissolve the powder in the liquid. did. The mixing device 120 shown in FIG.
4 is formed in a mortar shape, and the inner surface 126 is tapered. In addition, 128 is a rotating member 128, and a shaft portion 130 on the rear end side has a bearing 131 on the main body 122,
It is rotatably fitted via 132. The tip side 134 of the rotating member 128 is formed in a truncated cone shape,
The tapered outer surface 136 corresponds to the tapered inner surface 126 at a predetermined interval. Further, a sprocket 138 connected to a power source is attached to a rear end of the rotating member 128. A gasket 140 for sealing is provided between the main body 122 and the shaft 130, and the processing liquid containing the relay powder is supplied to the supply port 142 and discharged from the discharge port 143.

[0005]

According to the mixing device 120 shown in FIG. 7, the processing liquid supplied from the supply port 142 is applied to the tapered inner surface 126 formed in the main body 122.
, And the tapered outer surface 136 of the rotating member 128 that rotates at a predetermined interval, during which the powder in the processing liquid is crushed and discharged from the discharge port 143. In the discharged processing liquid, the spliced powder has disappeared, and a processing liquid in which the powder is uniformly dispersed and / or dissolved can be obtained. However, in the mixing device 120 shown in FIG.
Is larger than the gap between the tapered inner surface 126 and the tapered outer surface 136 of the rotating member 128, and cannot enter the gap between the tapered inner surface 126 and the tapered outer surface 136. It takes time for the powder to completely disappear. Further, when the polymer flocculant is dispersed and / or dissolved in water or the like, a large shear force acts on the polymer flocculant passing through the mixing device, and the polymer molecules forming the polymer flocculant are formed. It was found that the strand was broken and the aggregation ability was reduced.

Therefore, the inventor of the present invention has designed the tapered inner surface 126 of the main body 122 and the tapered outer surface 136 of the rotating member 128 in order to shorten the time required for the generated remnant to completely disappear.
When the spiral groove is formed on each surface of the processing liquid, it is possible to forcibly feed the crushed powder in the processing liquid supplied from the supply port 142 between the tapered inner surface 126 and the tapered outer surface 136 and crush it. And the flour can be eliminated in a short time.
However, when dispersing and / or dissolving the polymer flocculant in water or the like, the polymer flocculant that has passed through the mixing device is still broken by the molecular chain of the polymer that forms the polymer flocculant and has a flocculating ability. Was found to have declined. Accordingly, an object of the present invention is to provide a method for dispersing and / or dissolving a powder composed of a polymer by supplying the powder to a liquid. It is an object of the present invention to provide a mixing device capable of preventing as much as possible the breaking of the molecular chain of the polymer forming the polymer.

[0007]

As a result of studying to solve the above-mentioned problems, the present inventor has found that a joint powder obtained by filtering a treatment liquid by a filtration member and filtering the mixture is pressed between the surface of the filtration member and a roller. By crushing, even when a polymer flocculant is used as the powder, the dispersion and / or dissolution treatment can be performed in a short time while preventing the molecular chains of the polymer forming the powder as much as possible. Knowing what can be done, they arrived at the present invention. That is, the present invention relates to a mixing apparatus for crushing and dispersing and / or dissolving powder lumps generated in a treatment liquid when supplying and dispersing powder to a liquid, A tubular filtration member for filtering the treatment liquid into a uniform liquid and a powder mass, and crushing the powder mass remaining on the inner surface of the cylindrical filtration member to disperse and / or dissolve in the treatment solution; Rotatable in a state in which the peripheral surface is pressed against the inner surface of the cylindrical filtration member by an urging member so that a uniform treatment liquid is obtained.
Together they are provided in, in a mixing apparatus characterized by comprising a roller as crushable member that is movable along the inner surface.

[0008] As shown in FIG. 8, a powder mass (split powder) generated when a powder is dispersed and / or dissolved in a liquid has a swelling layer Y in which the powder absorbs the liquid and swells. Core part Z consisting of
It has a structure that wraps around. The swelling layer Y prevents contact between the core portion Z and the liquid, and makes it difficult to process the powder X. In this regard, in the present invention, the swelling layer Y of the crushed powder X is broken by crushing the crushed powder X between the filtering member and the crushing member, so that the liquid and the core portion Z can directly contact each other. . For this reason, in the mixing device of the present invention, even the large powder X can be forcibly crushed by the crushing member to break the swelling layer Y and bring the core portion Z into contact with the liquid, thereby forming the core portion Z. The powder can be rapidly dispersed and / or dissolved in the processing liquid to obtain a uniform processing liquid. Moreover, when crushing the powder X, compared to a mixing device in which spiral grooves are formed on each of the tapered inner surface of the main body and the tapered outer surface of the rotating member, a large shear is applied to the powder X. As a result of being able to crush the powder X without applying force, it is possible to prevent the molecular chain of the polymer forming the powder from being cut as much as possible.

[0009]

FIG. 1 shows a mixing apparatus according to the present invention. In FIG. 1, a cylindrical filter member 80 is provided as a filter member for filtering a treatment liquid and separating the treated liquid into a uniform liquid and a joint powder. The tubular filtering member 80 is formed by laminating a plurality of wire mesh filters having different openings. Of the wire mesh filters constituting the cylindrical filter member 80, the mesh is finer in the inner wire mesh filter, and the wire mesh filter in the outermost layer is used as a strong carrier and has the largest mesh size. At both ends of the cylindrical filter member 80, flanges 82, 82 whose outer peripheral surfaces are inscribed in the cylindrical body 81 are provided.
A gap portion 83 is formed between the outer peripheral surface of the cylindrical member 81 and the inner peripheral surface of the cylindrical body 81. In addition, the flange 8 inscribed with the inner peripheral surface of the cylindrical body 81
The packing groove 8 is formed in each of the outer peripheral surfaces of
4 and 84 are sandwiched between the inner and outer peripheral surfaces of the cylindrical body 81 and the flanges 82 and 82 to ensure the sealing performance.

A shaft 86 provided at one end with a pulley 85 to which a driving force is transmitted from a driving device (not shown) is rotatably inserted through the center of the cylindrical filtering member 80. The shaft 86 is provided with flanges 87, 87 that rotate together with the shaft 86 so as to be near flanges 82, 82 provided at both ends of the cylindrical filtering member 80. As shown in FIG.
As shown in FIG. 8, a roller 88 having a concave portion 88 and an outer peripheral portion 93 formed of an elastic member such as urethane rubber.
The end 90 of the rotating shaft 95 is movably inserted between the bottom surface of the recess 88 and the outlet. Further, as shown in FIGS. 1 and 2, a concave portion 91 provided on the bottom surface of the concave portion 88 has
A spring 92 as an urging member is mounted on the roller 89.
Is urged toward the outer peripheral surface of the flange 87. Therefore, the outer peripheral surface of the roller 89 is pressed against the inner surface of the cylindrical filtering member 80. Therefore, the shaft 86
When the roller is rotated, the roller 89 moves (revolves) along the inner surface of the cylindrical filtration member 80 with the rotation of the shaft 86,
The roller 89 whose outer peripheral surface is pressed against the inner surface of the cylindrical filter member 80 rotates (rotates) about a rotation shaft 95.

In the mixing apparatus shown in FIGS. 1 and 2, the processing liquid supplied from the supply port 94 provided in the cylindrical body 81 flows in the direction of arrow A and is supplied into the cylindrical filtering member 80. . The uniform liquid in the supplied processing liquid is supplied to a gap 83 between the outer peripheral surface of the cylindrical filtration member 80 and the inner peripheral surface of the cylindrical body 81.
And flows in the direction of arrow B and is discharged from a discharge port 96 provided in the cylindrical body 81. On the other hand, the relay powder in the processing liquid remains on the inner peripheral surface of the cylindrical filtration member 80. The joint powder remaining on the inner peripheral surface moves (revolves) along the inner surface of the cylindrical filtration member 80 with the rotation of the shaft 86, and the rotation shaft 95.
Are crushed by a roller 89 rotating (rotating) about the center. Therefore, the roller 89 is a crushing member for crushing the powder. In this way, by crushing the joint powder by the crushing member, the swelling layer Y of the joint powder X shown in FIG. 8 is broken, and the core portion Z can come into contact with the liquid, and the powder forming the core portion Z is processed. After being dispersed and / or dissolved in the liquid, it passes through the cylindrical filtering member 80, is filtered out in the gap 83, and is discharged from the discharge port 96. Further, when crushing the lump by the roller 89, when the core unit Z also milled, dispersed powder to the liquid and /
Alternatively, the dissolution rate can be further improved. The roller 89
Since the spring 92 that urges the substrate comes into contact with the processing liquid, it is preferable to use a spring 92 made of a non-rusting material such as stainless steel.

FIG. 1 shows the mixing device 50 in which a single roller 89 is provided in the cylindrical filtering member 80 as a crushing member, but FIG. As shown in (1), a plurality of rollers 89, 89, 89 may be provided in the cylindrical filtering member 80 as crushing members. As shown in FIG. 2, each of the plurality of rollers 89, 89, 89 has an end 90 of each rotation shaft 95 formed in a recess 88 provided on an outer peripheral surface of a flange 87 that rotates together with a shaft 86. The outer peripheral surface of the outer peripheral portion 93 formed by the elastic member of each roller 89 is inserted into the cylindrical filter member 80.
Is biased by a spring 92 as a biasing member so as to be pressed against the inner surface. Therefore, as shown in FIG. 3, when the shaft 86 is rotated in the direction of arrow C, each of the rollers 89 moves (revolves) in the direction of arrow D while rotating, that is, along the inner surface of the cylindrical filtration member 80. . Therefore, according to the mixing device 50 shown in FIG. 3, the powder remaining on the inner surface of the cylindrical
1 is provided with a single roller 89 as a crushing member.
It is possible to crush the flour in a shorter time as compared with 0. In addition, in the mixing device 50 shown in FIG. 1, when the passage pressure increases due to the blockage of the cylindrical filtration member 80,
By performing backwashing by supplying the cleaning liquid from the discharge port 96 and cleaning the cylindrical filter member 80 from the discharge port 94, the clogging of the cylindrical filter member 80 can be removed.

[0013] Further, as shown in FIG.
A mixing device 50 in which a plurality of rollers 89, 89, 89 and plate-like bodies 97, 97, 97 are provided between the rollers.
Can also be suitably used. Mixing device 5 shown in FIG.
The zero rollers 89, 89, 89 have the same structure as those in FIGS. 1 and 2, and a detailed description thereof will be omitted. The plate-like members 97, 97, 97 in FIG. 4 are provided in the radial direction with respect to the shaft 86, and both end surfaces thereof are fixed to the flanges 87, 87 that rotate together with the shaft 86. It rotates with 86. However, a gap is formed between the distal end of the plate-like body 97 and the inner surface of the cylindrical filter member 80, and the plate-like body 97 is not in contact with the cylindrical filter member 80. As shown in FIG. 4, a tapered portion 98 whose slope is inclined in the moving direction of the plate-like body 97 (the direction of rotation of the shaft 86) is formed at the tip end of the plate-like body 97.
For this reason, the large powder dust remaining on the inner surface of the cylindrical filtration member 80 can be reduced into small powder dust by the tapered portion 98, and the powder dust can be easily crushed by the roller 89. Further, the plate-like members 97, 97, 97 also function as baffle plates, and can prevent the processing liquid supplied into the cylindrical filtering member 80 from rotating together with the shaft 86, and disperse and / or disperse the powder in the liquid. Dissolution processing can be performed quickly.

FIG. 5 shows a dispersing / dissolving apparatus using the mixing apparatus 50 shown in FIGS. The dispersing / dissolving apparatus shown in FIG. 5 is used for treating wastewater such as industrial wastewater or domestic wastewater, and the treatment liquid obtained by dispersing and / or dissolving the flocculant as powder is temporarily stored in a storage tank. After that, the wastewater is introduced into the flocculation tank of the wastewater treatment device, supplied into the wastewater, and flocculates the suspended matter suspended in the wastewater. As such a flocculant, an inorganic polyvalent salt such as a sulfate band or ferric chloride or a polymer substance is used. As a flocculant composed of this polymer substance, there is a cation showing a positive ion, an anion showing a negative ion, or a nonion showing neutrality when dissolved in water. There are cationically modified acrylamide, diallyl, chitosan, polyamine and dicyanedianed. In addition, as a component of the anion, there is a sodium polyacrylate system. As a nonionic component, there is a polyacrylamide type. These flocculants are:
In the atmosphere, moisture tends to clump together and the dispersion and / or dissolution time is affected by water temperature. Further, the treatment liquid in which the coagulant is dispersed and / or dissolved has a high viscosity and is in a state of drawing a string. Such a flocculant is hardly dispersed and / or dissolved in water, and has a property that when added to water, a flour is easily generated.

A dispersing / dissolving apparatus shown in FIG. 5 for dispersing and / or dissolving the coagulant includes a first supply device 14 for continuously supplying water 12 in a desired amount into the tank 10 and a coagulant 22. And a second supply device 20 that supplies the tank 10 to the tank 10. The first supply device 14 has a water supply 15
A valve 17 for opening and closing a pipe line 16 connected to the air conditioner, and a constant flow valve 18 for maintaining a constant flow of water. The second supply device 20 is provided with a supply port 24 that is located above the tank 10 and continuously supplies the coagulant 22 into the tank 10 in a desired amount. The supply port 24 of the coagulant 22 is provided eccentrically from the center of the tank 10 and can supply the coagulant 22 to a suitable position for dispersing and / or dissolving in the water 12. And / or dissolution efficiency can be improved. Further, a coagulant 22 supplied to the tank 10 is provided in the second supply device.
And a dry air supply device 28 for supplying dry air into the hopper 26. The dry air supply device 28 has a discharge port formed so as to discharge dry air downward along the inclined inner surface of the hopper 26, and includes a dry air generator 30 for supplying dry air to the discharge port. The dry air generator 30 includes a dry generator connected to the compressed air source 33, and a regulator that adjusts the amount of dry air discharged from the dry generator and supplied to the ejection port. As the dry generator, a moisture adsorbent such as silica gel, or a dryer that removes moisture by using a pressure change and a temperature change can be used.However, in order to reduce the size of the apparatus, for example,
A dry generator using a hollow fiber membrane can be suitably used.

A feeder 3 is provided below the hopper 26.
4 are provided. The feeder 34 has a coagulant 2
And a discharge mechanism for continuously discharging the coagulant 22 from the hopper 26 in a desired amount, and supplying the dry air so that the flocculant 22 discharged into the supply port 24 by the discharge mechanism is blown off by dry air and supplied into the tank 10. A dry air ejection mechanism 36 for ejecting the air into the mouth 24. The dry air ejection mechanism 36 includes a nozzle for ejecting dry air into the supply port 24 and a dry air generating unit 30 for supplying dry air to the nozzle. The dry air generator 30 is also used for supplying dry air to the dry air supply device 28. In this way, by supplying the dry air into the hopper 26 and the supply port 24, the water 1 stored in the tank 26 can be surely and little by little fixed without coagulating the coagulant 22.
2 can be supplied.

A stirring device 38 is provided at the bottom of the tank 10 to which the water 12 and the coagulant 22 are supplied, and a stirring blade 40 rotated by a motor 39 is provided.
Since the stirring blade 40 is located at the bottom of the tank 10, as in the conventional dispersing / dissolving device shown in FIG. The problem of growing into large chunks of flour does not occur. Further, the tank 10 is provided with a water level detecting device 42, which measures the amount of the supplied water 12 and the processing liquid 43 (the processing water in which the coagulant 22 is mixed and / or dissolved) to the liquid level (liquid level). Surface height). When the liquid level exceeds the upper limit or the lower limit, the first supply device 14 and the second supply device 20 or the discharge device (for example, a tube pump 46 described later) is controlled by a signal from the water level detection device 42. , The supply amount of the water 12 and the coagulant 22 and the discharge amount of the processing liquid 43 can be matched. In addition, tank 1
At 0, a ventilation device 45 is provided to ventilate the air in the tank 10, and the moisture in the tank 10 enters the feeder 34 and the hopper 26 to prevent the coagulant 22 from coagulating. The processing liquid 43 adjusted in the tank 10 is discharged by a tube pump 46 connected to the tank 10 via a drain pipe 48. The discharge amount is an amount corresponding to the amount supplied from the first supply device 14 and the second supply device 20. The processing liquid discharged by the tube pump 46 is connected to a mixing device 50 shown in FIGS.
Supplied to The uniform processing liquid obtained by crushing the joint powder in the processing liquid by the mixing device 50 and dispersing and / or dissolving it in the processing liquid is supplied to the processing tank 53.

The operation of each device shown in FIG.
Do with. The power supply 56 is supplied with power to each device via the control panel 54, and the control conditions are set based on a supply signal 58 input by the user. Such a control panel 54
The wiring 60 for opening and closing the valve 17, the wiring 62 for operating the compressor 33, the wiring 64 for controlling the motor 66 for driving the feeder 34,
Wiring 68 for controlling the motor 39 for driving the stirring blade 40, and wiring 6 for controlling the tube pump 46
9 and 70 are wirings 7 for controlling the mixing device 50.
Each of the 0s has been extended. The hopper 26 is provided with a sensor 72 for detecting the amount of the coagulant 22,
A signal from the sensor 72 is sent to the control panel 54 via the wiring 74. Further, a signal from the water level detecting device 42 provided in the tank 10 is sent to the control panel 54 via the wiring 76.

As the mixing device 50 of the dispersing / dissolving device shown in FIG. 5, the mixing device 50 according to the present invention shown in FIG. 1 was used to disperse and / or dissolve the polymer flocculant.
The viscosity of the treatment liquid in which the polymer flocculant was manually dispersed and / or dissolved was 100 cps. Further, the cylindrical filter member 80 is formed by laminating five wire mesh filters having different openings, and the mesh becomes narrower as the inner wire mesh filter is formed. The opening of the finest wire mesh filter in the innermost layer is 100 μm. As a comparison, a conventional mixing device 120 shown in FIG. 7 was used as the mixing device 50 of the dispersing / dissolving device shown in FIG.
The same polymer flocculant as in the case of using the mixing device 50 shown in FIG. 1 was dispersed and / or dissolved. As a result, FIG.
When the mixing device 50 shown in FIG. 1 is used, the viscosity of the treatment liquid in which the polymer flocculant is dispersed and / or dissolved is 90 cps
However, when the conventional mixing apparatus 120 of FIG. 7 was used, the rate was reduced to 50 cps or less. This indicates that the mixing device 50 shown in FIG. 1 has less breakage of the molecular chains of the polymer forming the polymer flocculant than the conventional mixing device 120 of FIG. Further, when the passing amount of the processing liquid is the same, the passing pressure at which the processing liquid passes through the mixing device 50 shown in FIG. 1 is 1/5 to the passing pressure of the conventional mixing device 120 shown in FIG.
It became 1/10. As described above, in the mixing device 50 according to the present invention described above, the example using the cylindrical filtering member 80 has been described, but a flat filtering member may be used. In this case, a roller pressed against the outer peripheral surface of the filtering member is provided so as to reciprocate in the left-right direction on the flat filtering member. Although a polymer flocculant has been used as a powder, a flocculant composed of an inorganic substance may be used. Furthermore, also in the food field, the mixing device according to the present invention can be used, for example, for dispersing flour in water.

[0020]

According to the present invention, when powder composed of a polymer is supplied to a liquid and subjected to dispersion and / or dissolution treatment, it is possible to crush the joint powder generated in the treatment liquid in a short time. In addition, the breaking of the molecular chains of the polymer forming the powder can be prevented as much as possible. For this reason, in wastewater treatment and the like, the polymer flocculant can be added to the wastewater while preventing a decrease in the flocculating function of the polymer flocculant as much as possible. .

[Brief description of the drawings]

FIG. 1 is a partial longitudinal sectional view showing an example of a mixing device according to the present invention.

FIG. 2 is a partial cross-sectional view for explaining a structure of a rotating shaft end portion of a roller used in the mixing device shown in FIG.

FIG. 3 is a partial cross-sectional view showing another example of the mixing device according to the present invention.

FIG. 4 is a partial cross-sectional view showing another example of the mixing device according to the present invention.

FIG. 5 is a schematic diagram for explaining a dispersing / dissolving device using the mixing device according to the present invention.

FIG. 6 is a schematic diagram for explaining a conventional dispersing / dissolving apparatus.

FIG. 7 is a partial longitudinal sectional view showing a conventional mixing device.

FIG. 8 is an explanatory diagram for explaining a structure of a flour.

[Explanation of symbols]

 Reference Signs List 50 mixing device 80 cylindrical filtering member 81 cylindrical body 86 shaft 87 flange 88 concave portion 89 roller 90 end of rotating shaft 95 of roller 89 92 spring 93 peripheral surface of roller 89 97 plate-shaped member 98 tapered portion

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) B01F 1/00-3/22 B02C 15/08

Claims (5)

(57) [Claims] 1. A mixing apparatus for dispersing and / or dissolving a liquid mass by crushing a powder mass generated in a treatment liquid when a powder is supplied to a liquid and dispersed and / or dissolved. A cylindrical filtration member for filtering the liquid into a uniform liquid and a powder mass, and crushing the powder mass remaining on the inner surface of the cylindrical filtration member, dispersing and / or dissolving in the treatment liquid and uniformly In order to obtain the treatment liquid, the urging member is provided so as to be rotatable in a state where the peripheral surface is pressed against the inner surface of the cylindrical filtration member.
Together they are kicked, mixing apparatus characterized by comprising a roller as crushable member that is movable along the inner surface. 2. The peripheral surface of the roller is formed by an elastic member.
It made that it has claim 1 mixing apparatus according. 3. A roller as a crushing member, wherein the roller is a cylindrical filtration unit.
A plurality of rollers are provided in the material, and each of the rollers is
State in which the peripheral surface is pressed against the inner surface of the cylindrical filter member
Along with the inner surface.
The mixing device according to claim 1, wherein the mixing device is movably provided . 4. A peripheral part formed by an elastic member has a cylindrical shape.
Rotatable while pressed against the inner surface of the filter
A gap is provided between the provided roller and the inner surface and the tip.
The formed plate-like body is aligned with the inner surface of the cylindrical filtration member.
Movably provided, and a slope is inclined at the tip end of the plate-like body toward the movement direction.
The mixing device according to claim 1, wherein a tapered portion is formed . 5. A filter member comprising a plurality of gold sheets having different openings.
The mixing device according to any one of claims 1 to 4, wherein a mesh filter is laminated .