JPH07145585A - Floating type deinking device - Google Patents

Abstract

PURPOSE:To improve the deinking effect of a floating type deinking device by mixing a recovered paper material solution with air and simultaneously extruding the mixture in a high speed into the first nozzle for extruding a main paper material solution through the second nozzle to accelerate the foaming of the solution in a floating chamber. CONSTITUTION:In a floating type deinking device, a main paper material solution is extruded from a feeding pipe 5 into the first floating chamber 1 as an eddy flow chamber through the first nozzle 4, and the upper layer paper solution flow of the chamber 1 is flowed out into the second floating chamber 2 as a flow-subsiding chamber through an overflow gate 3. The recovered paper solution is collected from a solution-collecting pipe 9 through a pump 8 in the flow-subsiding chamber 2, and subsequently extruded together with air supplied from an air-supply pipe 10 from the second nozzle 6 at a larger flow speed than the extrusion speed of the main paper material solution through the third nozzle 15 faced to the exit of the second nozzle 6 for accelerating the gas-liquid mixing of the main paper material solution and the recovered paper material solution, thus accelerating the deinking. The foam of the ink solution floated on the surface of the solution in the flow-supplying chamber 2 is removed with a scraper.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a floating deinking apparatus used in the process of refining waste paper materials.

[0002]

2. Description of the Related Art Conventionally, a floating deinking apparatus has been known in which air is sent into a stock solution to generate a large amount of bubbles, and the bubbles retain an ink component for removal.

As a typical example of this floating type deinking apparatus, a stock liquid is pumped to the bottom of a circular floating chamber by a high-pressure pump, and air is sucked into the supply line of the stock liquid into the floating chamber. By discharging, a swirl is generated in the stock liquid in the floating chamber,
2. Description of the Related Art A device is generally used in which ink components are bubbled to float on a liquid surface and the ink bubbles are removed by a scraper.

As another example, while pumping the stock solution into the floating chamber, air is supplied into the stock solution by an underwater pump installed in the floating chamber so that the ink components are bubbled to float on the liquid surface. Similarly, a device for removing with a scraper is widely used.

[0005]

SUMMARY OF THE INVENTION In the former example, a high power pump is used to increase the flow rate of the stock solution to promote swirling and gas-liquid mixing in the floating chamber. However, since the flow velocity is high, the foaming efficiency of the fine bubbles is unexpectedly poor, and there is a problem that a large power pump must be used for this device.

In the latter case, high density foaming is possible without using a large power pump for supplying the stock solution, but active gas-liquid mixing and foaming effect are expected near the submersible pump. However, it has a drawback that the gas-liquid mixing is significantly reduced in the outer peripheral portion of the floating chamber away from the submersible pump.

[0007]

As a means for solving the above problems, the present invention is provided with a first nozzle for discharging the main stock liquid from the outside into the floating chamber,
The recovered stock solution taken out from the floating chamber is the first
A second nozzle that discharges into the nozzle is provided, and air is supplied to a pipe portion that supplies the recovered stock solution to the second nozzle, and the recovered stock solution that is gas-liquid mixed is first passed through the second nozzle. It is configured such that it is discharged at high speed into the nozzle, merges with the main stock liquid, and is discharged into the floating chamber.

In addition to the conventional single tank type, the floating chamber has a double tank type as will be described later, one of the tanks (first floating chamber) forms the swirl chamber, and the nozzles are passed into the swirl chamber. A gas-liquid mixed stock solution (main stock solution, recovered stock solution and air) is supplied to promote swirl and foaming, and a static flow chamber is formed in the other tank (second floating chamber). The overflow liquid from the first floating chamber can be discharged into the chamber to promote foaming in a static state.

The foamed ink component, in other words, the black ink bubbles rich in the ink component, float up and are densely gathered as a layer near the liquid surface of the floating chamber (the second floating chamber in the case of the double tank type). This is removed by a black ink bubble removing means such as a scraper.

[0010]

According to the present invention, a limited amount of the recovered stock solution is discharged from the second nozzle into the first nozzle at a high speed to accelerate the stock solution in the first nozzle and discharge it into the floating chamber. It is also possible to discharge the recovered stock solution mixed with gas and liquid from the second nozzle into the first nozzle at a high speed and join the main stock solution in the first nozzle to discharge it from the first nozzle into the floating chamber. By adopting such a configuration, it is possible to induce a uniform gas-liquid mixture by the activity of the main stock solution and air, and improve the foaming effect after that.

Further, since the amount of the recovered stock solution is limited, it is possible to carry out high-speed pressure feeding with a pump having a small horsepower, thereby obtaining a required air suction effect.

As described above, it is possible to provide a floating deinking device that achieves a sound foaming effect, and thus a deinking effect, while achieving a large reduction in power (pump).

[0013]

Embodiments of the present invention will be described in detail below with reference to FIGS. 1 to 5. In this embodiment, a two-tank type deinking device is shown, and the case of using the gas-liquid mixed stock liquid supply device is shown.

The two-tank type deinking device has a first floating chamber 1 and a second floating chamber 2 which are arranged adjacent to each other. The first floating chamber 1 forms a swirl chamber, and the second floating chamber 2 It forms a static flow chamber.

The first floating chamber 1 is formed in a form that effectively induces the vortex flow, preferably in a cylindrical shape as shown in the drawing, and the second floating chamber 2 has an arc-shaped wall of the cylindrical first floating chamber 1 on one side. And a notch is formed at the upper end of the arc-shaped wall forming one side of the second floating chamber of the first floating chamber 1, and the overflow gate 3 is formed by this notch.

The gas-liquid mixed stock solution to be deinked is discharged by a pump to the inner bottom portion of the first flow chamber 1 to generate a vortex in the stock solution filling the floating chamber, and the upper-layer stock solution is discharged. With the bubbles floating on the surface, the bubbles flow into the second floating chamber 2 through the overflow gate 3 to make them static and promote foaming.

As means for discharging and supplying the main stock liquid from the outside to the first floating chamber 1, that is, the swirl chamber, a first nozzle 4 and a supply for pumping the main stock liquid to the first nozzle 4 by a pump. With tube 5. Therefore, the first nozzle 4 is provided at the outlet end of the main stock liquid supply pipe 5, and the nozzle 4 is opened near the lower end of the wall that defines the first floating chamber 1 so that the main stock liquid is fed into the first floating chamber. In the vicinity of the inner bottom of No. 1, it is discharged into the same room.

The first nozzle 4 can be mounted at any position on the peripheral wall of the first floating chamber 1, but in the illustrated embodiment, the first nozzle 4 is formed on the arc-shaped wall adjacent to the second floating chamber 2. It is arranged at the lower end, that is, it is arranged in the second floating chamber 2, and the end of the main stock liquid supply pipe 5 communicating with the nozzle 4 is piped in the second floating chamber 2 to reduce the size of the apparatus. Planned.

A second nozzle 6 is opened in the first nozzle 4. The second nozzle 6 is a means for discharging the recovered stock material liquid taken out from the floating chamber toward the inside of the first nozzle 4, and as shown in FIG. Of the first nozzle 4 is made to project into the inside of the pipe from the pipe in the vicinity of the continuous portion of the first nozzle 4, and the outlet end of the first nozzle 4 is opened substantially at the center. Therefore, the recovered stock solution is discharged to approximately the center of the main stock solution.

The second nozzle 6 is a means for discharging a limited amount of recovered stock liquid at a high speed by being inserted into the inlet side pipe portion of the second nozzle 4 as described above, and has a diameter of the inlet side of the first nozzle 4. Also, the nozzle has a sufficiently small diameter as compared with the diameter of the pipe portion into which the second nozzle 6 is inserted. Therefore, the pipe 7 for supplying the recovered stock liquid to the second nozzle 6 is also a pipe having a sufficiently smaller diameter than the main stock liquid supply pipe 5. In the case of the two-tank type deinking device, the recovered stock solution supply pipe 7 takes out the stock solution from the bottom of the second floating chamber 2 by the pump 8 and supplies it to the second nozzle 6 under pressure. At the inlet end of the recovered stock solution supply pipe 7, there is a second
A liquid collecting pipe 9 extending to the inner bottom of the floating chamber 2 is connected, and the other end is piped into the second floating chamber 2 and connected to the second nozzle 6 at the bottom thereof. The pump 8 is arranged in the middle of 7.

An air supply pipe 10 is connected to the pipe portion on the outlet side of the pump 8, preferably near the end of the pipe portion adjacent to the second nozzle 6 and opened into the pipe 7. An ejector 11 is provided in a pipe portion that connects the air supply pipe 10 to the recovered stock solution supply pipe 7, and the suction of air into the pipe 7 is promoted at the flow rate of the recovered stock solution. Therefore, the air is not forcibly fed, and the pipe 7 can be moved depending on the flow rate of the recovered stock solution.
The amount of inhalation is determined. Of course, the case of forced air supply is not excluded. This is configured to be adjusted by the adjusting valve 12 provided in the air supply pipe 10.

Thus, the recovered stock solution and air are mixed in the pipe immediately before the second nozzle 6, and the mixture is passed through the second nozzle 6 having a small diameter to the first nozzle 4. Is ejected rapidly.

As a result, the main stock solution flowing around the gas-liquid mixed recovered stock solution discharged from the second nozzle 6 is mixed with the recovered stock solution at an increased flow rate, and the outlet end of the first nozzle 4 is discharged. The liquid is rapidly discharged from the opening 13 into the first floating chamber 1.

Thus, the main stock liquid mixes well with the recovered stock liquid, which is a gas-liquid mixed liquid, and is discharged into the first floating chamber 1 at a sufficient flow rate to enter the same chamber 1. It promotes swirling of the filled stock solution, where it further promotes gas-liquid mixing. Along with this vortex, the ink components are bubbled and float to the liquid surface, while the stock liquid mixed with air and gas rises uniformly from the bottom to the liquid surface.
This upper layer stock solution flows out into the second floating chamber 2 through the overflow gate 3 together with the bubbles.

As described above, the generation of fine air bubbles is small depending on the vortex flow, but in the first floating chamber, that is, the vortex flow chamber, rather than the foaming action, a uniform gas-liquid mixture of the stock liquid and the air particles is generated. Urged this to overflow into the second floating chamber 2 and
It is configured to promote foaming inside.

As a means for uniformly promoting the gas-liquid mixing in the first floating chamber 1, an inclined surface 14 is provided at the inner bottom of the first floating chamber 1 for causing an upward flow of the swirl stock solution. As shown in FIGS. 1 and 5, the inclined surface 14 extends in the radial direction of the first floating chamber 1 and has an upward slope with respect to the flow of the stock solution, and the stock solution in the lower layer portion and the upper layer portion. Promotes mixing.

As means for increasing the gas-liquid mixing effect of the gas-liquid mixed recovered stock solution discharged from the second nozzle 6 and the main stock solution pressure-fed toward the first nozzle 4, as shown in FIG. A third nozzle 15 inside the first nozzle 4 or on the inlet side of the first nozzle 4 (or including the case of extending over both), and inside the opening on the inlet end side of the third nozzle 15. The outlet side opening of the second nozzle 6 is exposed to
The recovered stock liquid mixture of gas-liquid mixture discharged from the nozzle 6 is discharged into the third nozzle 15, and the main stock liquid is positively flowed from the inlet end side opening of the third nozzle 15 by this discharge. Constitute.

That is, by discharging the recovered stock solution from the second nozzle 6 into the third nozzle 15, the opening between the outlet end of the second nozzle 6 and the inlet end of the third nozzle 15 is opened. The main stock solution is rapidly introduced from the formed annular opening 16 and discharged into the first nozzle 4 through the outlet end side opening of the third nozzle 15.

The outlet side opening of the third nozzle 15 is arranged so as to discharge the stock solution to a substantially central portion of the inlet end side opening of the first nozzle 4.

The inlet end of the third nozzle 15 is expanded into a trumpet shape as shown in the drawing, and the second nozzle 6 is opened at the approximate center of the trumpet shape expansion opening. The third nozzle 15 and the second nozzle 6 cooperate with each other to promote gas-liquid mixing, accelerate the speed, and discharge the stock liquid from the third nozzle 5 into the first nozzle 4. Is supplied to the main stock liquid flowing around the third nozzle 15 from the first nozzle into the first floating chamber 1.

The outlet end of the third nozzle 15 is opened in front of the inlet end of the first nozzle 4 or protrudes into the inlet end of the first nozzle 4. Further, when the third nozzle 15 is not provided, the outlet end of the second nozzle 6 is opened before the inlet end of the first nozzle 4, or is configured to project into the inlet end of the first nozzle 4.

Thus, while the vortex flow of the stock liquid is generated in the first flow chamber 1, the ascending stock liquid mixed with the gas and liquid uniformly flows out into the second floating chamber 2, and
In the floating chamber 2, while maintaining a static state as much as possible, foaming is promoted, and the black ink bubbles containing the ink component are densely floated on the liquid surface, and the black ink bubbles are scraped by the scraper 2.
It is removed by a black ink removing means such as 0.

Reference numeral 17 is an outlet for the black ink removed by the scraper 20. In addition, the stock liquid from which the ink liquid bubbles have been removed is led out from the outlet 18 immediately below the liquid surface and the outlet 19 of the bottom wall of the second floating chamber 2, merged and taken out. Needless to say, the primary deinking stock solution taken out from the outlets 18 and 19 may be supplied again to the main stock solution supply pipe 5 of another deinking apparatus to perform the secondary deinking.

As described above, the present invention can be implemented by forming the floating chamber into a single tank type.

[0035]

According to the present invention, the first nozzle for ejecting the main amount of the recovered stock liquid by the second nozzle is limited.
By discharging at high speed toward the inside of the nozzle, the flow rate of the stock liquid discharged from the first nozzle into the floating chamber can be increased, and air can be mixed with the collected stock liquid at the second nozzle. By discharging toward the inside of the first nozzle, gas-liquid mixing is uniformly promoted, and both effects promote the foaming effect in the floating chamber and improve the deinking effect.

Since the second nozzle needs only a limited amount of recovered stock liquid, it can be pumped at high speed by a pump having a small horsepower, and thus a required air suction effect can be obtained and a wide range of power (pump) can be obtained. A sound foaming effect and therefore a deinking effect can be expected while reducing the amount.

[Brief description of drawings]

FIG. 1 is a plan view of a floating deinking apparatus showing an embodiment of the present invention.

FIG. 2 is a cross-sectional view taken along the line AA.

FIG. 3 is a longitudinal sectional view of the same.

FIG. 4 is a vertical cross-sectional view of the nozzle section.

FIG. 5 is a sectional view of means for promoting gas-liquid mixing in the swirl chamber.

[Explanation of symbols]

 1 1st Floating Chamber 2 2nd Floating Chamber 4 1st Nozzle 5 Supply Pipe 6 2nd Nozzle 7 Recovered Paper Stock Liquid Supply Pipe 8 Pump 9 Liquid Collection Pipe 10 Air Supply Pipe 15 3rd Nozzle 20 Scraper

Claims (4)

[Claims] 1. A first nozzle for discharging a main stock liquid into the floating chamber from the outside, and a second nozzle for discharging a recovered stock liquid taken out from the floating chamber into the first nozzle.
A floating type deinking device that includes a nozzle, an air supply pipe portion that supplies air to the stock liquid toward the second nozzle, and a unit that removes black ink bubbles floating on the liquid surface of the floating chamber. apparatus. 2. The outlet of the second nozzle is made to face the inside of the first nozzle or the third nozzle which is arranged on the inlet side of the first nozzle and which allows the diverting of the main stock liquid. 1
The floating deinking device described. 3. The floating chamber comprises a first floating chamber for receiving a stock liquid supply from the first nozzle, and a second floating chamber for discharging an upper layer stock liquid of the first floating chamber. The two nozzles discharge the recovered stock solution taken out from the second floating chamber into the first nozzle through the second nozzle, and the black ink bubbles on the liquid surface of the second floating chamber are removed by the removing means. The floating deinking device according to claim 1, wherein the floating deinking device is arranged. 4. The floating deinking apparatus according to claim 1, wherein the flow rate of the recovered stock solution discharged from the second nozzle is set to be higher than the flow rate of the main stock solution.