JP2002275776A - Flotator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve a problem that an installation can not be compacted due to too many parts, and a problem that it is difficult to uniformly disperse and supply a waste paper raw material liquid into a treating tank in the longitudinal direction of an air-diffusing pipe. SOLUTION: This flotator is provided with at least two treating tanks 12a to 12d, an air-diffusing pipe 14 which is penetrated and disposed in the lower portion of the treating tanks 12a to 12d and on whose outer peripheral surface a plurality of air- diffusing ports 20a to 20d are formed, an air-supplying means for supplying compressed air into the air-diffusing pipe 14 to blow out bubbles from the air-diffusing ports 20a to 20d, raw material-introducing ports 26i which are opened just under the air- diffusing pipe 14 placed in the treating tanks 12a to 12d and are used to introduce a waste paper raw material liquid 11 to the treating tanks 12a to 12d, raw material- draining ports 26o for draining the waste paper raw material liquid 11 in the treating tanks 12a to 12d, and raw material-transferring passages 26 each used for connecting the raw material-draining port 26o of one treating tank to the raw material-introducing port 26i of the other treating tank to transfer the waste paper raw material liquid 11 in one treating tank to the raw material-transferring passage 26 of the other treating tank.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a process for blowing air bubbles from a lower part of a processing tank to which a waste paper raw material liquid is supplied, and adhering ink particles interposed in the waste paper raw material liquid to the surface of the air bubbles. The present invention relates to a flotator that removes ink particles from a used paper raw material liquid by overflowing.

[0002]

2. Description of the Related Art In general, recycled paper is prepared by disintegrating printed waste paper, removing ink adhering to the waste paper fibers, and carefully selecting the recycled paper.
After dehydration, it is obtained by papermaking again.
In this case, matters relating to the deinking process for removing ink from the used paper fibers are important factors that greatly influence the time required for the subsequent selective processing and the production cost and quality of recycled paper.

In a flotator for performing a used paper deinking treatment, air bubbles are blown into a defibrated and chemically treated used paper raw material liquid, and ink particles released from used paper fibers in the used paper raw material liquid rise in the used paper raw material liquid. The ink particles in the waste paper raw material liquid are removed by removing the floss that floats on the surface of the waste paper raw material liquid, that is, the air bubbles to which the ink particles adhere, from the waste paper raw material liquid. In this case, it is important to obtain a large deinking effect by supplying fine bubbles evenly to the waste paper raw material liquid and increasing the chance of contact between the ink particles floating in the waste paper raw material liquid and the bubbles. As disclosed in, for example, Japanese Patent Publication No. 6-60473, various floatators have been conventionally proposed.

[0004] In a floater disclosed in Japanese Patent Publication No. 6-60473 and the like, rotary air diffusers are respectively arranged below a plurality of processing tanks connected in series, and projecting from the outer peripheral surface of each air diffuser. Fine bubbles are ejected from a large number of provided air blowing nozzles, and the waste paper raw material liquid is sequentially supplied from a processing tank on the most upstream side to a processing tank on the most downstream side, and floss is removed for each processing tank. Thus, the waste paper raw material liquid from which the ink particles have been substantially removed is finally taken out of the processing tank on the most downstream side.

[0005]

In order to obtain a large deinking effect on waste paper, fine air bubbles are evenly supplied to the waste paper raw material liquid, and ink particles and air bubbles floating in the waste paper raw material liquid are removed. Since it is effective to make sufficient contact, the air diffuser tends to be elongated along its longitudinal direction, and the waste paper raw material liquid supplied into the treatment tank is spread over the entire region in the longitudinal direction of the air diffuser. It is desirable to be able to spread.

However, in the conventional flotator disclosed in Japanese Patent Publication No. 6-60473, the opening width of the raw material supply port formed in each processing tank does not extend over the entire region in the longitudinal direction of the air diffuser. Therefore, it is difficult to uniformly disperse and supply the waste paper raw material liquid in the treatment tank along the longitudinal direction of the diffuser pipe, and particularly, a phenomenon of stagnation of the waste paper raw material liquid present below both ends in the longitudinal direction of the diffuser pipe occurs. . For this reason, the waste paper raw material liquid located at both ends in the longitudinal direction of the air diffuser has a greater tendency to be exposed to a larger amount of bubbles than the waste paper raw material liquid located at the central part in the longitudinal direction of the air diffuser, and the progress of deinking is scattered. It has a distribution along the longitudinal direction of the trachea, which contributes to a decrease in the deinking efficiency of the processing tank, and eventually the flotator as a whole.

In addition, since an independent air diffuser is assembled for each processing tank, the equipment as a floatator becomes complicated, the number of parts is increased, and maintenance and inspection work for this requires a lot of time.

[0008]

SUMMARY OF THE INVENTION An object of the present invention is to make it possible to uniformly disperse and supply a waste paper raw material liquid in a processing tank along the longitudinal direction of an air diffuser, and to make equipment compact by reducing the number of parts. It is to provide a floatator that can be obtained.

[0009]

According to a first aspect of the present invention, there is provided:
Bubbles are blown from the lower part of the processing tank to which the waste paper raw material liquid is supplied, ink particles interposed in the waste paper raw material liquid are attached to the surface of the air bubbles, and the air bubbles overflow from the upper part of the processing tank, A floatator for removing the ink particles from a raw material liquid, wherein the floater is disposed so as to penetrate at least two processing tanks and a lower part of the processing tanks, and has a plurality of air diffusion ports formed on an outer peripheral surface. A diffuser tube, air supply means for supplying compressed air into the diffuser tube to eject air bubbles from the diffuser port, and a waste paper raw material which is opened directly below the diffuser tube located in the processing tank and opened. A raw material introduction port for introducing a liquid into the processing tank, a raw material discharge port for discharging the waste paper raw material liquid in the processing tank,
A raw material transfer passage connected to the raw material discharge port of one of the processing tanks and the raw material introduction port of the other processing tank and leading the waste paper raw material liquid of the one processing liquid tank to the other processing liquid tank; It is characterized by having.

In a second embodiment of the present invention, air bubbles are blown from a lower part of a processing tank to which a used paper material liquid is supplied, and ink particles interposed in the used paper material liquid are attached to the surface of the air bubbles, and the air bubbles are removed. A floatator that overflows from the upper part of the processing tank and removes the ink particles from the waste paper raw material liquid, and is disposed so as to penetrate at least two processing tanks and lower parts of these processing tanks, A diffuser tube having a plurality of diffuser ports formed on an outer peripheral surface thereof; air supply means for supplying compressed air into the diffuser tube to eject bubbles from the diffuser ports; A raw material introduction port for opening a waste paper raw material liquid that is opened directly below the air diffuser and introducing the used paper raw material liquid into the processing tank, and disposed adjacent to each of the processing tanks, and an upper end portion of the waste paper raw material liquid in the processing tank. From the lower end. A gas-liquid separation tank for discharging waste paper raw material liquid, and a raw material transfer passage connecting a lower end of the gas-liquid separation tank adjacent to one of the processing tanks and the raw material inlet of the other processing tank. It is characterized by having.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In a flotator according to the first and second aspects of the present invention, a raw material introduction port extends along a longitudinal direction of an air diffuser tube, and a width dimension thereof extends along a longitudinal direction of the air diffuser tube. It is preferable that the width substantially coincides with the width of the corresponding processing tank.

The air outlet is opened on the outer peripheral surface of the air diffuser, and the length of the air outlet along the axis of the air diffuser is set to be larger than the width of the air diffuser along the circumferential direction of the air diffuser. May have been done.

[0013] A rotation driving means for driving and rotating the air diffuser may be provided.

[0014] The opening ratio of the air diffuser opening on the outer peripheral surface of the diffuser pipe may be different for each processing tank.

In the flotator according to the second aspect of the present invention, the processing tank and the gas-liquid separation tank adjacent thereto are separated by a partition plate whose upper end is located at a position lower than the liquid level of the waste paper raw material liquid in the processing tank. The used paper raw material liquid in the treatment tank may be introduced into the gas-liquid separation tank from a weir formed at the upper end of the partition plate.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of a floatator according to the present invention will be described in detail with reference to FIGS. 1 to 5, but the present invention is not limited to such an embodiment, and other embodiments having similar problems are included. It can also be applied to technology in the field.

FIG. 1 shows a schematic structure of a floatator according to this embodiment. That is, the processing tanks 12a, 12b, 12 having a four-layer structure for introducing a predetermined amount of the used paper material liquid 11 respectively.
c and 12d (hereinafter, these may be collectively abbreviated as 12) are connected to each other via the partition wall 13. In the center of the lower ends of these processing tanks 12, one air diffuser 14 is provided.
Are arranged so as to pass through.

FIG. 2 shows the appearance of the air diffuser 14 in this embodiment.
FIG. 3 shows the cross-sectional structure of the air diffusion port. That is, the air diffuser 14 in the present embodiment includes a cylindrical drum portion 15 located in the processing tank 12 and the drum portion 15.
Are formed integrally on both sides in the longitudinal direction of the waste paper, and are located at the most upstream side and the most downstream side in the flow direction of the waste paper raw material liquid 11.
A pair of extending portions 16 protruding from the outer walls of the processing tanks 12a and 12d, respectively, and one of the extending portions 16 (the left side in FIG. 1) is formed.
7, a pair of rotating shafts 19 protruding from the pair of extending portions 16,
5, a plurality of air diffusers 20a, 20b, 20c, 20 for blowing air bubbles into the used paper material liquid 11
d (hereinafter sometimes collectively referred to as 20). First and fourth treatment tanks 12 located at the most upstream side and the most downstream side in the flow direction of waste paper raw material liquid 11
a and 12d, a partition wall 13 for partitioning the outer wall and the processing tank 12 adjacent to each other;
4 and the outer peripheral surface of the waste paper material liquid 11
A seal mechanism (not shown) for preventing leakage of the gas is incorporated.

The pair of rotating shafts 19 are provided with a pair of bearings 21.
Rotatably supported by one of the rotating shafts (in FIG. 1,
A drive source (not shown) for driving and rotating the diffuser 14 at a predetermined speed is connected to the shaft coupling 22 provided on the left side).

Accordingly, the drive source is operated to rotate the air diffuser 14 in the direction of the arrow in FIGS. 2 and 3, while supplying a predetermined flow rate of compressed air from the compressor into the rotary joint 17 through the air supply pipe 23. By guiding this from the air inlet 18 into the drum unit 15, fine bubbles are injected from the individual air diffusers 20 into the waste paper raw material liquid 11 stored in the processing tank 12. .

The rotation speed of the air diffuser 14 is determined by the amount of compressed air supplied to the air diffuser 14 because the compressed air ejected from the air diffuser 20 forms fine bubbles in the waste paper raw material liquid 11. This is extremely important, and it is effective to set the peripheral speed of the drum portion 15 to be equal to or higher than the peripheral speed of the drum portion of the conventional diffuser, for example, about 9 to 15 meters per second. However, as the speed of the air diffuser 14 increases, the driving load also increases rapidly. Therefore, it is more preferable to set the speed to about 12 meters per second in consideration of the efficiency of the obtained effect.

In the present embodiment, the opening ratio of the air diffuser 20a opening to the drum 15 facing the first processing tank 12a (the area of the outer peripheral surface of the drum 15 interposed in each processing tank 12 The ratio of the total opening area of the diffuser ports 20 to be opened is the largest, and the opening ratio of the diffuser ports 20d to the drum unit 15 facing the fourth processing tank 12d is minimized.
Although the opening ratio of the air diffuser port 20 of the drum portion 15 facing each processing tank 12 is changed, the opening ratio may be all set to the same or the drums facing the second and third processing tanks 12b and 12c. The opening ratio of the air diffusers 20b, 20c of the unit 15 is maximized, and the opening ratios of the air diffusers 20a, 20d of the drum unit 15 facing the first and fourth processing tanks 12a, 12d are set smaller than this. You may. The change in the opening ratio can be dealt with by changing the number of the air diffusers 20 or the opening area of the individual air diffusers 20. The width W of each air diffuser 20 along the circumferential direction of the drum 15 (see FIG. 3)
Is set to be approximately the same as the inner diameter of the air blowing nozzle in the conventional air diffuser, that is, about 20 to 30 mm.
It is effective to set the length of the air diffuser 20 larger than the width W of each air diffuser 20. Usually, it is preferable to set the length of the air diffuser 20 to about three times the width W thereof. However, depending on the size of the floatator and its operating conditions, it is naturally possible to make the length of the air diffuser port 20 about 1.5 to 4 times the width dimension W thereof.

As described above, the air diffuser 14 in this embodiment is
Since the air outlet 20 formed in the drum portion 15 has a width that is three times longer and narrower than that of the conventional air outlet nozzle, the number of the air outlets 20 is 1 / the number of the air outlet nozzles.
It can be reduced to about 3. In addition, since the air diffuser 14 in this embodiment does not need to retrofit an air blowing nozzle, which is a separate component, to the drum 15, the air diffuser 14 can be manufactured easily and at low cost. In addition, since the air diffusion port 20 for generating air bubbles in the waste paper raw material liquid 11 supplied into the processing tank 12 is only opened on the outer peripheral surface of the drum portion 15, the waste paper fiber is It is possible to suppress such a problem that the air diffusion port 20 is adhered to the air diffusion port 20 and is blocked.

In addition to the above-mentioned air diffuser 14,
It is of course possible to use a conventionally used air diffuser provided with a number of air blowing nozzles projecting radially from the outer peripheral surface of the drum portion.

FIG. 1 is a sectional view taken along the line IV-IV in FIG.
4 and 5 show the cross-sectional structures as viewed from arrows. That is, beside the diffuser 14 located in each processing tank 12,
Gas-liquid separation tanks 24a, 24b, 24 for each processing tank 12
In order to form c and 24d (hereinafter, these may be abbreviated as 24 collectively), a weir plate 25 whose upper end is located lower than the liquid level of the used paper raw material liquid 11 in the processing tank 12 is formed. It stands upright in parallel with the axis of the air diffuser 14.
That is, the individual processing tanks 12 and the gas-liquid separation tanks 24 are separated by the weir plates 25.

A gas-liquid separation tank 24 corresponding to the processing tank 12 located on the upstream side in the flow direction of the waste paper raw material liquid 11 and the processing tank 12 adjacent on the downstream side in the flow direction of the waste paper raw material liquid 11 form a partition wall 13. They communicate with each other via raw material transfer passages 26 formed therethrough. One open end 26o of the raw material transfer passage 26, that is, the raw material discharge port of the present invention is formed at the lower end of the gas-liquid separation tank 24, and the other open end 26i as the raw material introduction port of the present invention is inside the processing tank 12. Is formed immediately below the air diffuser 14 located at the position. In the present embodiment, the other open end 26i of the raw material transfer passage 26 located immediately below the diffuser 14 is an individual processing tank 1 along the axis of the diffuser 14.
2 is open over the entire width of the air diffuser 2 in each processing tank 12.
Air bubbles blown out from zero can also be used effectively.

In the present embodiment, the other open end 26i of the raw material transfer passage 26 is located immediately below the air diffuser 14. However, as long as the waste paper raw material liquid 11 is supplied to the vicinity of the air diffuser 14, it can be used. It is also possible to bring the opening position close to the weir plate 25 side.

One end of the raw material transfer passage 26 whose other open end 26i is located in the first processing tank 12a is used to supply the used paper raw material liquid 11 obtained in the preceding disintegration step into the first processing tank 12. The raw material supply pipe 27 is connected. Also,
One end of the raw material transfer passage 26, whose other open end 26i is located at the lower end of the gas-liquid separation tank 24d corresponding to the fourth processing tank 12d, receives the processed waste paper raw material liquid 11 discharged from the gas-liquid separation tank 24d. It is connected to a raw material liquid recovery pipe 28 for taking out and supplying it to the next fine selection step.

In the present embodiment, the depth of the gas-liquid separation tank 24 is set to approximately 1/2 of the depth of the processing tank 12, and the waste paper raw material liquid 11 in the gas-liquid separation tank 24 is Although the gas-liquid separation tank 24 is set to be almost the same depth as the processing tank 12, the waste paper raw material liquid 11 is set to the processing tank adjacent from the lower end of the gas-liquid separation tank 24. 12
May be caused to flow almost directly beneath the air diffuser 14. At the upper ends of the processing tank 12 and the gas-liquid separation tank 24, air bubbles with ink particles floating on the liquid surface of the waste paper raw material liquid 11, that is, floss 30, are discharged to the outside of the processing tank 12 and the gas-liquid separation tank 24. Fros gutters 29 are provided respectively, and the processing tank 12 and the gas-liquid separation tank 2
From the liquid level of the used paper raw material liquid 11 introduced into the
The floss 30 that overflows over the fog passes through the floss gutter 29 and is discharged to the outside of the processing tank 12 by the drain pipe 31. Immediately above the floss gutter 29, an antifoaming agent supply pipe 33 having a downwardly directed nozzle 32 for spraying an antifoaming agent such as water for defoaming the floss 30 is provided. Connected to device.

In this embodiment, a diffusion plate 34 for uniformly dispersing air bubbles is provided above the air diffuser 14 of each processing tank 12.
The distance between the lower end of the diffuser plate 34 and the upper end of the diffuser tube 14 is set to 20 to 250 mm, more preferably 50 to 250 mm, in order to optimize the size of the bubbles ejected from the diffuser port 20.
Set to about 150mm. From such a viewpoint, the diffusion plate 34 may be made to be able to move up and down, and it is also effective to arrange a plurality of diffusion plates 34 at intervals in the vertical direction.

Accordingly, the first processing tank 1
The waste paper raw material liquid 11 supplied into the waste paper raw material liquid 11 is agitated with the air blown out from the air diffusing port 20a of the diffuser pipe 14, and is contained in the waste paper raw material liquid 11 on the surface of bubbles rising in the waste paper raw material liquid 11. The ink particles adhere to the floss 30 and float on the liquid surface of the used paper raw material liquid 11 and overflow into the floss gutter 29,
The liquid is discharged from the drainage pipe 31 by the floss gutter 29.

The waste paper raw material liquid 11 from which the ink particles have been removed in the first processing tank 12a flows into a gas-liquid separation tank 24 over a weir plate 25 communicating with the upper part of the first processing tank 12, and It is supplied from the transfer passage 26 to the second processing tank 12b. In this case, while the used paper raw material liquid 11 flows down in the gas-liquid separation tank 24a, the floss 30 contained in the used paper raw material liquid 11 floats on the liquid surface of the used paper raw material liquid 11 and overflows into the floss gutter 29, Because the floss gutter 29 discharges from the drain pipe 31, the floss 30 contained in the used paper material liquid 11 supplied to the second processing tank 12 b side becomes extremely small, and the floss 30 is efficiently removed from the used paper material liquid 11. Can be removed. This waste paper deinking process is performed in the third and fourth treatment tanks 12c,
Similarly, the waste paper raw material liquid 11 from which the ink particles are gradually removed finally flows down the gas-liquid separation tank 24d adjacent to the fourth processing tank 12d, and the raw material liquid recovery pipe 28 And collected from

In the above-described embodiment, the description has been made of the four-stage floatator. However, by alternately connecting two or more treatment tanks and gas-liquid separation tanks in series, the recovered waste paper raw material liquid 11 is recovered. Whiteness can be improved.

[0034]

According to the first embodiment of the present invention, an air diffusion tube having a plurality of air diffusion ports formed on the outer peripheral surface thereof is disposed so as to pass through the lower part of at least two processing tanks. The raw material inlets are opened directly below the air diffusers in the inside, so that the air bubbles ejected from the air diffusers are efficiently brought into contact with the waste paper raw material liquid supplied into the processing tank from the raw material inlets. Becomes possible. Also, since only one air diffuser is required regardless of the number of processing tanks, the equipment can be made more compact than the conventional one by reducing the number of parts.

According to the second embodiment of the present invention, the air diffusion tube having a plurality of air diffusion ports formed on the outer peripheral surface thereof is disposed so as to pass through the lower part of at least two processing tanks. A gas-liquid separation tank for introducing the raw material liquid from the upper end and discharging the waste paper raw material liquid from the lower end is disposed adjacent to each processing tank, and the raw material inlet is provided immediately below the diffuser pipe in each processing tank. Are opened, it is possible to efficiently contact the bubbles ejected from the air diffuser with the waste paper raw material liquid supplied into the processing tank from the raw material inlet. Further, the used waste paper raw material liquid and the air bubbles can be more reliably separated by the gas-liquid separation tank to realize a good deinking treatment. Furthermore, since only one air diffuser is required regardless of the number of processing tanks, the equipment can be made more compact than the conventional one by reducing the number of parts.

The treatment tank and the gas-liquid separation tank adjacent thereto are
The upper end is partitioned by a partition plate at a position lower than the liquid level of the waste paper raw material liquid in the processing tank, and the waste paper raw material liquid in the processing tank is introduced into the gas-liquid separation tank from a weir formed at the upper end of this partition plate. In this case, the partition plate separates the adjacent processing tank and the gas-liquid separation tank, so that an increase in the number of parts can be minimized.

When the raw material introduction port extends in the longitudinal direction of the diffuser tube and its width dimension substantially matches the width dimension of the corresponding treatment tank along the longitudinal direction of the diffuser pipe, The used paper raw material liquid can be reliably and uniformly dispersed and supplied into the processing tank along the longitudinal direction, and efficient deinking processing can be performed.

The air diffuser is opened on the outer peripheral surface of the air diffuser, and the length of the air diffuser along the axis of the diffuser is set larger than the width of the air diffuser along the circumferential direction of the diffuser. If you do
In addition, it is possible to prevent a problem that waste paper fibers are caught in the air diffuser and cause clogging.

When the air diffuser is driven and rotated by the rotation driving means, finer bubbles can be ejected from the air diffuser port, and a more efficient deinking process can be performed.

When the opening ratio of the air diffuser opening on the outer peripheral surface of the diffuser tube is made different for each processing tank, the amount of compressed air supplied to the diffuser tube can be minimized. Waste of energy can be avoided.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a schematic structure of an embodiment of a floater according to the present invention.

FIG. 2 is a front view showing the appearance of the air diffuser in the embodiment shown in FIG.

FIG. 3 is a sectional view of a portion of one air diffuser in the air diffuser shown in FIG. 4;

FIG. 4 is a sectional view taken along the line IV-IV in FIG.

FIG. 5 is a sectional view taken along the line VV in FIG. 1;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Waste paper raw material liquid 12a, 12b, 12c, 12d Processing tank 13 Partition wall 14 Air diffuser 15 Drum part 16 Extension part 17 Rotary joint 18 Air inlet 19 Rotary shaft 20, 20a, 20b, 20c, 20d Air diffuser 21 Bearing 22 Shaft Coupling 23 Air Supply Pipes 24a, 24b, 24c, 24d Gas-Liquid Separation Tank 25 Weir Plate 26 Raw Material Transfer Path 26i, 26o Open End of Raw Material Transfer Path 27 Raw Material Supply Pipe 28 Raw Material Liquid Recovery Pipe 29 Floss Gutter 30 Floss 31 Discharge Liquid pipe 32 Nozzle 33 Defoamer supply pipe 34 Diffusion plate

 ──────────────────────────────────────────────────の Continued on the front page (72) Inventor Yukihiro Ikeda 5-13-3 Ginza, Chuo-ku, Tokyo Inside Oji Engineering Co., Ltd. (72) Inventor Kentaro Kadowaki 5-13-3 Ginza, Chuo-ku, Tokyo No. Oji Engineering Co., Ltd. F-term (reference) 4L055 AC09 CA36 FA22 GA35

Claims (7)

[Claims] An air bubble is blown from a lower part of a processing tank to which a waste paper raw material liquid is supplied, ink particles interposed in the waste paper raw material liquid are attached to the surface of the air bubble, and the air bubbles overflow from an upper part of the processing tank. What is claimed is: 1. A flotator configured to flow and remove said ink particles from said waste paper raw material liquid, comprising: at least two processing tanks; An air diffuser tube having an opening formed therein; air supply means for supplying compressed air into the air diffuser tube to eject air bubbles from the air diffuser opening; and A raw material introduction port for opening and introducing a waste paper raw material liquid into the processing tank; a raw material discharge port for discharging the waste paper raw material liquid in the processing tank; and a raw material discharge port for one of the processing tanks Outlet and the other processing tank A raw material transfer passage connected to the raw material introduction port and guiding the waste paper raw material liquid in the one processing liquid tank to the other processing liquid tank. 2. A bubble is blown from a lower portion of the processing tank to which the waste paper raw material liquid is supplied, ink particles interposed in the waste paper raw material liquid are attached to the surface of the bubble, and the air bubbles overflow from the upper part of the processing tank. What is claimed is: 1. A flotator configured to flow and remove said ink particles from said waste paper raw material liquid, comprising: at least two processing tanks; An air diffuser tube having an opening formed therein; air supply means for supplying compressed air into the air diffuser tube to eject air bubbles from the air diffuser opening; and A raw material introduction port for opening and introducing a waste paper raw material liquid into the processing tank, and disposed adjacent to the processing tank, and introducing the waste paper raw material liquid in the processing tank from the upper end and from the lower end. Drain this waste paper raw material liquid A gas-liquid separation tank, and a material transfer passage connecting a lower end of the gas-liquid separation tank adjacent to one of the processing tanks and the material introduction port of the other processing tank. And a floatator. 3. The processing tank and the gas-liquid separation tank adjacent thereto are partitioned by a partition plate whose upper end is located at a position lower than the liquid level of the waste paper raw material liquid in the processing tank. The floater according to claim 2, wherein the waste paper raw material liquid in the processing tank is introduced into the gas-liquid separation tank from a weir formed at an upper end of the float tank. 4. The raw material introduction port extends along a longitudinal direction of the diffuser tube, and a width dimension thereof substantially matches a width dimension of the corresponding processing tank along a longitudinal direction of the diffuser tube. The floater according to any one of claims 1 to 3, wherein: 5. The air diffuser opening on the outer peripheral surface of the air diffuser, wherein the length of the air diffuser along the axis of the air diffuser is along the circumferential direction of the air diffuser. The floater according to any one of claims 1 to 4, wherein the width is set to be larger than a width of the mouth. 6. The apparatus according to claim 1, further comprising a rotation driving unit for driving and rotating the air diffuser.
The floater according to any one of the above. 7. The flow according to claim 1, wherein the opening ratio of the air diffuser opening on the outer peripheral surface of the air diffuser is different for each processing tank. Theta.