JP2000005514A - Recovering device of powdered material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve recovering efficiency at the time of recovering a powdered material incorporated in a drainage being used for a chemical treatment. SOLUTION: The drainage supplied into a tank main body 31 is forcedly filtered with a filter 33 moving in the vertical direction in a state in which a periphery is allowed to contact with an inner wall of the tank main body 31. A phosphor powder filtered and gathered at a lower side of the filter 33 is recovered by receiving with a pan 35 or discharged by pushing out from a removing port with a pushing plate. The phosphor powder is effectively removed from a development drainage since the drainage is forcedly filtered by shifting the filter 33.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for recovering powder material contained in wastewater used for chemical treatment.

[0002]

2. Description of the Related Art Conventionally, this type of recovery apparatus has been used for recovering inorganic or organic powder from wastewater used for chemical treatment in the manufacturing process of various products such as electronic equipment. . For example, regarding a manufacturing process of a plasma display panel (hereinafter, referred to as a PDP), when electrodes, ribs, phosphor screens, and the like are formed by a photolithography method, silver powder contained in wastewater of a developing process,
A device that collects glass powder, phosphor powder, and the like is used, and as the recovery device, a device that collects by filtering through a filter is generally used. Here, the manufacturing process of the PDP will be described.

Generally, a PDP has a structure in which a pair of regularly arranged electrodes are provided on two opposing glass substrates, and a gas mainly composed of Ne, Xe, or the like is sealed between the electrodes. Then, by applying a voltage between these electrodes and generating a discharge in a minute cell around the electrodes,
Each cell emits light to perform display. In order to display information, regularly arranged cells are selectively caused to emit light. There are two types of PDPs, a direct current type (DC type) in which the electrodes are exposed to the discharge space, and an alternating current type (AC type) in which the electrodes are covered with an insulating layer. And a refresh driving method and a memory driving method.

FIG. 1 shows a configuration example of an AC type PDP. This figure shows the front plate and the back plate separated from each other. As shown in the figure, two glass substrates 1 and 2 are arranged in parallel and opposed to each other, and both become the back plate. The ribs 3 provided on the glass substrate 2 in parallel with each other are held at regular intervals. On the back side of the glass substrate 1 serving as a front plate, composite electrodes composed of a sustain electrode 4 which is a transparent electrode and a bus electrode 5 which is a metal electrode are formed in parallel with each other, and a dielectric layer 6 is covered thereover. The protective layer 7 (MgO layer) is further formed thereon. On the front side of the glass substrate 2 serving as the back plate, address electrodes 8 are formed between the ribs 3 so as to be orthogonal to the composite electrodes and are formed in parallel with each other. Are formed, and a phosphor 10 is provided so as to cover the wall surface of the rib 3 and the cell bottom surface. The AC type PDP is of a surface discharge type, and has a structure in which an AC voltage is applied between composite electrodes on a front panel to discharge by an electric field leaking into a space. In this case, since the alternating current is applied, the direction of the electric field changes according to the frequency. Then, the phosphor 10 emits light by the ultraviolet light generated by the discharge, so that an observer can visually recognize the light transmitted through the front plate.

In the back plate of the PDP as described above, an address electrode 8 is formed on a glass substrate 2, a dielectric layer 9 is formed so as to cover it, if necessary, and a rib 3 is formed. It is manufactured by providing a phosphor screen made of the phosphor 10 between the ribs 3. As a method of forming the electrode 8, a method of forming a film of an electrode material on the substrate 2 by a vacuum evaporation method, a sputtering method, a plating method, a thick film method, and the like, and patterning the film by a photolithography method, and a method of forming a thick film paste A patterning method using a screen printing method used is known. The dielectric layer 9 is formed by screen printing or the like, and the ribs 3 are formed by overprinting by screen printing, sandblasting, photolithography, or the like. Further, the phosphor screen is formed by a method of selectively filling phosphor paste of three colors of red (R), green (G), and blue (B) between the ribs 3 by screen printing, or a high-definition type. In Japanese Patent Application Laid-Open No. H11-157, a phosphor screen is formed between ribs by a photolithography method using a phosphor paste.

[0006]

Among the above-mentioned methods for forming a phosphor screen of a PDP, in the method of forming a phosphor screen by photolithography, a photosensitive phosphor paste is coated over a rib with a solid and dried. After repeating a process and a process of performing exposure and development to leave a phosphor paste in a predetermined cell space by a required number of colors, a phosphor screen is completed through a firing process in an oven. in this way,
When forming a phosphor screen by photolithography,
Exposure and development are repeated for the phosphor paste for each color. This development step is performed by spray development using water. However, since a large amount of phosphor powder is contained in the wastewater, it is necessary to collect and reuse it. At present, the wastewater from the developing device is filtered through a filter to collect the phosphor powder, but there is a problem that the time required for the filtration is long and the collection efficiency is not good.

Not only in the case of such a phosphor screen formation,
When forming electrodes and ribs by photolithography,
Furthermore, not only in the PDP manufacturing process, but also in the case where powder material is contained in wastewater used for other chemical treatments, because a filtration-type recovery device using a filter is used. There is a similar problem.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a powder material collecting apparatus which has a simple mechanism and high collection efficiency.

[0009]

SUMMARY OF THE INVENTION In order to solve the above problems, a first type of recovery apparatus according to the present invention is an apparatus for recovering a powder material contained in waste water, comprising an upper part and a lower part. A tank having a water inlet and a water outlet, respectively,
A filter disposed inside the tank and capable of moving up and down between an upper position above the inlet and a lower position below the outlet with the surrounding in contact with the inner wall of the tank; And a pan arranged to cover the bottom of the tank on the lower side.

In order to achieve the same object, a second type of recovery device according to the present invention is a device for recovering a powder material contained in waste water, wherein water is supplied to an upper portion and a lower portion, respectively. A tank having a mouth and a discharge port, and vertically disposed between the upper position above the input port and the lower position below the discharge port in a state in which the tank is disposed inside the tank and in contact with the inner wall of the tank. It is characterized by comprising a possible filter and a push plate which can move toward the removal port at the lower end of the side wall of the tank while contacting both surfaces of the lower surface of the filter at the lower position and the bottom surface of the tank.

[0011] In any type of recovery apparatus, a mechanism for ultrasonically oscillating the filter is provided.
It is preferable to provide a mechanism for applying a back pressure to the filter.

[0012]

Embodiments of the present invention will be described below in detail with reference to the drawings.

FIG. 2 is a schematic structural view showing an example of the recovery apparatus according to the present invention. In FIG. 2, reference numeral 11 denotes a tank, and a supply pipe 12 and a discharge pipe are provided at an inlet at a high position and an outlet at a low position, respectively. 13 are connected. The discharge pipe 13 is connected to a pump 15 via a discharge valve 14.
The water discharged from the pump 15 is drained through the intermediate pipe 16, the filtration section F, and the discharge pipe 17. A flowmeter 18 and a pressure gauge 19 are interposed in an intermediate pipe 16 extending from the pump 15 to the filtration unit F.

FIG. 3 is a sectional view of a tank constituting a first type of recovery apparatus. As shown in the figure, the outside of the tank 11 is composed of a tank body 31 and a lid 32 that covers the tank body 31. The tank 11 has an inlet at an upper side wall and an outlet at a lower side wall of the tank body 31, respectively. The aforementioned supply pipe 1
2 and the discharge pipe 13 are connected. 33 is the tank body 3
1, a filter disposed in an upper position above the charging port (FIG. 3) in a state where the surrounding is in contact with the inner wall of the tank body 31.
(A) position and a lower position below the discharge port (FIG. 3).
(Position shown in (b)).
That is, the filter 33 has a mounting frame 34 around it, and is appropriately reinforced with a frame or the like so as not to bend by water pressure. Although not shown, the surrounding mounting frame 34 is watertight on the inner wall of the tank body 31. A mechanism is provided for moving the filter 33 up and down while making contact. Also, a mechanism for ultrasonically oscillating the stopped filter 33 may be provided, or a mechanism for applying pressure with air from above the filter 33 may be provided so that the inside of the tank can be sealed as shown in FIG. To Further, a pan 35 is provided so as to cover the bottom of the tank main body 31 below the lower position of the filter 33. It is preferable that the pan 35 can be taken in and out of the side wall of the tank body 31.

In the first type of recovery apparatus having this configuration, for example, when the filter 33 is in the upper position and the discharge valve 14 of the discharge pipe 13 is closed as shown in FIG. The drainage from the developing device used when forming the phosphor screen by the photolithography method is supplied to the supply pipe 1.
2 and is supplied into the tank body 31. When a predetermined amount of drainage W is supplied into the tank body 31, the filter 3
3 descends and the drainage W is filtered. That is,
With the lowering of the filter 33, the waste water W is forcibly moved upward through the filter 33. At this time, the phosphor powder in the waste water remains below the filter 33, and most of the filtered phosphor powder is Settle in the pan 35. Filter 33
Reaches the lower position and when the filtration of the waste water is completed, the discharge valve 14 of the discharge port 13 is opened, and the water on the filter 33 is discharged from the discharge pipe 13. Then, as shown in FIG. 3B, when the water is completely discharged, the filter 33 is returned to the upper position, the discharge valve 14 of the discharge pipe 13 is closed, and the drainage is supplied again from the supply pipe 12. filtration. Do. Note that when the filter 33 is in the lower position,
Is ultrasonically vibrated so that the phosphor powder attached to the filter 33 is shaken down into the pan 35. Or, FIG.
By applying a reverse pressure with air as in
The phosphor powder trapped in the container is dropped. Also,
The pan 35 is taken out as needed, and the phosphor powder collected in the pan 35 is collected.

FIG. 5 is a sectional view of a tank constituting a second type of recovery apparatus. As shown in the figure, the outside of the tank 11 is composed of a tank body 41 and a lid 42 that covers the tank body 41. The tank 11 has an inlet at the upper side wall and an outlet at the lower side wall of the tank body 41, respectively. The aforementioned supply pipe 1
2 and the discharge pipe 13 are connected. 43 is the tank body 4
1, a filter disposed in an upper position above the charging port in a state where the surroundings are in contact with the inner wall of the tank body 41 (FIG. 5).
(A position shown in FIG. 5A) and a lower position below the discharge port (FIG. 5).
(Position shown in (b)).
That is, the filter 43 has a mounting frame 44 around it, and is appropriately reinforced with a frame or the like so as not to be bent by water pressure. Although not shown, the surrounding mounting frame 44 is watertight on the inner wall of the tank body 41. A mechanism is provided for moving the filter 43 up and down while making contact. Further, in the second type of recovery device, a removing port 45 for the phosphor powder is provided at the lower end of the side wall of the tank body 41, and a pusher movable from the opposite side to the removing port 45 to the removing port 45 is provided. A plate 46 is provided, and the push plate 46 is directed toward the removal port 45 while contacting both surfaces of the lower surface of the filter 43 and the bottom surface of the tank body 41 at the lower position. Note that, as described in the previous example, the stopped filter 3
It is preferable to provide a mechanism for ultrasonically vibrating 3 or a mechanism for sealing the tank and applying pressure from above the filter 33 with air.

In the second type of recovery apparatus having this configuration, as shown in FIG. 5A, the filter 43 is in the upper position, and the discharge valve 14 of the discharge pipe 13 and the removal port 45 are removed.
In a state where both of the valves 47 are closed, for example, drainage from a developing device used when forming a fluorescent screen of a PDP by photolithography is supplied through the supply pipe 12 to the tank body 4.
1 is supplied. A predetermined amount of drain water W is stored in the tank body 41.
Is supplied, the filter 43 descends and the waste water W
Is performed. That is, with the lowering of the filter 43, the drainage W is forcibly moved upward through the filter 43, and at this time, the phosphor powder in the drainage is removed by the filter 43.
Most of the filtered phosphor powder remains on the bottom of the tank body 41. Then, as shown in FIG. 5B, when the filter 43 reaches the lower position and the filtration of the waste water is completed, the discharge valve 14 of the discharge pipe 13 is opened, and the filter 4 is opened.
The water above 3 is drained from the drain 13. Next, the valve 47 of the removal port 45 is opened, the push plate 46 is advanced as shown in FIG. 5C, and while the phosphor powder attached to the lower surface of the filter 43 is scraped, the tank body 4 is removed together with the remaining drainage.
The phosphor powder at the bottom of 1 is sent out through the removal port 45.
Before the push plate 46 is advanced, the filter 33 is ultrasonically vibrated when it is at the lower position, and the phosphor powder attached to the filter 33 is shaken down into the pan 35, or by air. It is preferable that the phosphor powder trapped by the filter 33 be dropped by applying a reverse pressure. When the remaining drainage has been discharged from the removal port 45, the filter 43 is returned to the upper position, the push plate 46 is returned to the original position, and the discharge valve 14 of the discharge pipe 13 and the valve 47 of the removal port 45 are connected together. In a closed state,
Drainage is again supplied from the supply pipe 12 to perform filtration and take out of the phosphor powder.

In any of the above-mentioned types of recovery apparatuses, the water from which the phosphor powder has been removed in the tank 11 may have a small but small amount of phosphor powder. Therefore, as described above, it is preferable that the water discharged from the tank 11 be discharged through the filtration unit F. Returning to FIG.
The filtration section F is located between the intermediate line 16 and the discharge line 17,
Two lines in which an injection valve 27 and a discharge valve 28 are inserted are provided in parallel before and after each filter 26. That is, by setting the injection valve 27 and the discharge valve 28 in each line to an open state or a closed state, one of the lines is used,
In a line not used, the filter 26 is cleaned or replaced. The time of replacement of the filter 26 can be known from the flow meter 18 and the pressure gauge 19 inserted in the intermediate pipe 16 extending from the pump 15 to the filtration section F.

[0019]

As described above, according to the powder material recovery apparatus of the present invention, the wastewater supplied into the tank body is filtered by the filter which moves up and down in a state where the surroundings are in contact with the inner wall of the tank body. By forcibly filtering, the powder material contained in the wastewater can be efficiently removed.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an example of a plasma display panel in which a front plate and a back plate are separated from each other.

FIG. 2 is a schematic configuration diagram illustrating an example of a recovery device according to the present invention.

FIG. 3 is a sectional view of a tank constituting a first type of recovery device.

FIG. 4 is a modification of the tank shown in FIG.

FIG. 5 is a sectional view of a tank constituting a second type of recovery device.

[Explanation of symbols]

 1, 2 glass substrate 3 rib 4 sustain electrode 5 bus electrode 6 dielectric tank 7 protective tank 8 address electrode 9 dielectric tank 10 phosphor 11 tank 12 supply pipe 13 discharge pipe 14 discharge valve 15 pump 16 intermediate pipe 17 discharge pipe Road 18 Current meter 19 Pressure gauge 26 Filter 27 Injection valve 28 Discharge valve 31 Tank body 32 Lid 33 Filter 34 Mounting frame 35 Pan 41 Tank main body 42 Lid 43 Filter 44 Mounting frame 45 Removal port 46 Push plate 47 Valve

Claims (6)

[Claims] 1. An apparatus for recovering powdery material contained in waste water, comprising: a tank having an inlet and an outlet for water at upper and lower portions, respectively, and a tank disposed inside the tank. A filter that can move up and down between an upper position above the inlet and a lower position below the outlet with the surroundings in contact with the inner wall, and cover the bottom of the tank below the lower position of the filter. An apparatus for recovering a powder material, comprising: a bread provided therein. 2. The powder material collecting apparatus according to claim 1, further comprising a mechanism for ultrasonically oscillating the filter. 3. The powder material collecting apparatus according to claim 1, further comprising a mechanism for applying a reverse pressure to the filter. 4. An apparatus for recovering powdery material contained in waste water, comprising: a tank having an inlet and an outlet for water at upper and lower portions, respectively, and a tank disposed inside the tank. A filter that can move up and down between an upper position above the inlet and a lower position below the outlet with the surroundings in contact with the inner wall, and contacts both the lower surface of the lower filter and the bottom surface of the tank. And a push plate movable toward a removal port at a lower end of a side wall of the tank. 5. The powder material collecting apparatus according to claim 4, further comprising a mechanism for ultrasonically oscillating the filter. 6. The powder material collecting apparatus according to claim 4, further comprising a mechanism for applying a reverse pressure to the filter.