JP3068909B2 - Floatator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flotator for flotation and separation of fine particles such as ink particles dispersed in a raw material in a deinking process of used paper such as newspapers, magazines and other various printed materials. .

[0002]

2. Description of the Related Art Conventionally, a flotator is generally used to remove dispersed ink particles in the deinking treatment of waste paper. This flotator attaches dispersed ink particles to the air bubbles that are blown in, floats and sorts it, and discharges it as floss.In order to enhance the floating sorting effect, increase the amount of blown air. Moreover, it is preferable to make the air bubbles fine. However, if the amount of air to be blown in is increased, large air bubbles are likely to be generated. Therefore, various improvements have been made to the air blowing mechanism in order to make a large amount of air as fine as possible. In addition, as a pretreatment for the floating separation of the ink particles by the floatator, it is necessary to disintegrate the raw materials and to separate and disperse the printing ink, and the quality of the pretreatment greatly affects the ink removing effect of the floatator.

[0003]

DISCLOSURE OF THE INVENTION The present invention provides a function of removing and dispersing ink from a raw material at the same time as making air bubbles blown into a flotator finer, and providing a high ink removal rate and a high lightness of the raw material. It is an object of the present invention to provide a flotator capable of achieving a high whiteness effect.

[0004]

According to the present invention, a supply port for raw material and air is provided at the center of the bottom of the tank body, and a grinding blade is provided around the supply port so as to be able to move up and down. A flotator characterized in that a rotor having a grinding blade opposed to the grinding blade is provided, a floss discharge part is further provided in an upper part of a tank body, and a raw material recovery part is provided below a lower liquid level thereof. In addition, a circulation path that circulates a part of the raw material recovered by the raw material recovery unit to the supply port is opened, or a flow path is formed between a draft tube and an outer periphery of the draft tube in the center of the tank. It is characterized in that the outer cylinder is relatively vertically movable.

[0005]

[Function] The raw material, which has been disaggregated and the printing ink is separated and dispersed by pretreatment, is supplied from the supply port to the center of the bottom of the tank together with air. By adjusting the gap with the crushed blade, the bubbles are made finer, and at the same time a strong shearing force is applied to the fiber surface, and the dirt and ink particles attached to the fiber surface are peeled and dispersed to make them finer. The air bubbles, raw materials and ink particles thus obtained are thoroughly mixed. Next, the fine bubbles adhere to the ink particles and float up to form floss on the liquid surface. The floss is discharged from the floss discharge portion by vacuum or the like, and the raw material from which the ink has been separated is recovered under the lower liquid surface. Collected from department.

[0006] It is also preferable to extend the residence time in the flotator by circulating a part of the raw material recovered from the raw material recovery section through a circulation path to a supply port, thereby achieving a high ink removal rate and a high lightness of the raw material. The effect of high whiteness is further improved.

[0007] Further, by arranging a draft tube and an outer cylinder forming a flow path between the outer circumferences of the draft tube at the center of the tank body so as to be able to move up and down relatively, a circulating flow is generated via the draft tube. This promotes the effect of trapping ink particles by air bubbles, and also adjusts the vertical position of the draft tube and outer cylinder according to the type and amount of chemicals such as surfactants contained in the supplied raw material, or the amount of air. , Ensure floss separation.

[0008] It is also extremely effective to use the above-mentioned respective floaters connected in series and in multiple stages, in which case air is supplied to the respective floaters.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. In FIG. 1, a supply pipe 4 having a raw material inlet 2 and an air inlet 3 is opened in the center of the bottom of the tank body 1, and a grinding blade 5 is provided around the opening of the supply pipe 4, Crushing blade 5
Is movable up and down by a handle 6. Supply pipe 4
A rotating shaft 8 that is rotated by a pulley 7 driven by a belt penetrates the inside, a rotor 9 is fixed to an end in the tank body 1, and a grinding blade opposed to the grinding blade 5 is provided on a lower surface of the rotor 9. 10 is fixed. As the grinding blades 5 and 10, various shapes can be used. For example, as shown in FIG. 2, a disk shape having a large number of irregularities in random directions is preferable. Further, a floss discharge unit 11 for collecting and discharging the floss floating on the liquid surface by vacuum is provided at an upper part of the tank body 1, and a raw material recovery port 12 is opened below the liquid level of the tank body 1. Have been. In such a flotator, the raw material and air are supplied from the supply pipe 4 to the center of the bottom inside the tank body 1 and the grinding blade 5 adjusted by raising and lowering the grinding blade 5 by the handle 6 and the grinding on the rotor 9 side. When the air passes through the gap with the blade 10, the air bubbles are made finer by the rotation of the rotor 9, and at the same time, the ink attached to the fibers contained in the supplied raw material is peeled off, and the dirt on the fiber surface is further removed. Due to the strong turbulence between the attritors, the fine bubbles and the raw materials and ink particles are sufficiently mixed. Next, the fine bubbles adhere to the dispersed ink particles and float, forming floss on the liquid surface. This floss is collected and discharged to the floss discharge section 11 by vacuum, and the raw material from which the ink has been removed is recovered from the raw material recovery port 12.

Also, as shown in FIG.
And the supply pipe 4 are communicated by a circulation pipe 14 having a valve 13, and a part of the raw material recovered from the raw material recovery port 12, for example, about ３, is circulated through the supply pipe 4 again. The ink particles remaining in the raw material can be subjected to the flotation effect again, so that the ink removal rate can be improved, and the number of stages in the case of using multiple stages in series as described above can be reduced.

In order to increase the ink removal rate by using these floaters, a plurality of floaters are used, and the raw material recovery port 12 of the former-stage floatator is connected to the raw material inlet 2 of the latter-stage floatator, and the ink floats in multiple stages in series. Preferably, sorting is performed, and air supply must be performed to each stage of the flotator.

Further, in another embodiment of the present invention, as shown in FIG. 3, the shape of the tank 1 is inverted conical, and a draft tube 15
An outer tube 17 is formed between the outer circumferences of the outer tube and the outer tube 17 so that the draft tube 15 can be moved up and down by a handle 18. In some cases, the outer tube 17 can be moved up and down by a handle 19. In this flotator, fine bubbles, raw materials, and ink particles are supplied into the tank body 1 and rotated by the rotating rotor 9, the grinding blades 10, and the grinding blades 5 to rise as a swirling flow. The vicinity of the central portion where the target has gathered rises in the draft tube 15, and the air bubbles adhering to the ink particles overflow from the upper part of the outer cylinder 17 as floss and are discharged from the floss discharge part 11. On the other hand, the air bubbles that could not be collected in the draft tube 15 continue to rise while revolving and collect in the center again, are collected in the outer cylinder 15 disposed outside the draft tube 15, and rise as it is. It overflows from the upper part of the outer cylinder 17 as a floss, and is discharged from the floss discharge part 11. The amount of the floss to be discharged is changed by adjusting the positions of the draft tube 15 and the outer cylinder 17 with the handles 18 and 19. on the other hand,
The raw material not collected in the draft tube 15 and the outer cylinder 17 is recovered from the raw material recovery port 12. As shown in FIG. 4, it is preferable that the floater is also used in multiple stages in series to improve the floating sorting effect. In addition, raw material collection port 1
Circulate a part (about 1/3) of the raw material recovered from 2,
By blowing again into the flotator from the raw material circulation port 20, the raw material is mixed again strongly, the remaining ink is removed, the ink removal rate is improved, and the number of stages in the case of using the series multiple stages as described above is reduced. Can be reduced.

[0013]

According to the present invention, the bubbles supplied into the flotator are miniaturized, and at the same time, the dirt and ink adhering to the fibers are separated and dispersed, and the ink removal rate and the high brightness of the raw material are obtained. By improving the high whiteness effect and circulating a part of the raw material recovered in the flotator,
Further, the ink removal rate can be improved.

[Brief description of the drawings]

FIG. 1 is a vertical sectional side view showing an embodiment of the present invention.

FIG. 2 is a plan view showing an example of a grinding blade used in the present invention.

FIG. 3 is a longitudinal sectional side view showing an embodiment of the present invention.

FIG. 4 is an explanatory view showing an example of use of the floater of the present invention.

[Explanation of symbols]

 Reference Signs List 1 tank body 2 raw material inlet 3 air inlet 4 supply pipe 5 grinding blade 6 handle 7 pulley 8 rotating shaft 9 rotor 10 grinding blade 11 floss discharge section 12 raw material recovery port 13 valve 14 circulation pipe 15 draft tube 16 flow path 17 outside Tube 18 Handle 19 Handle

Claims (3)

(57) [Claims] 1. A supply port for raw material and air is provided at the center of the bottom of a tank body, and a grinding blade is provided around the supply port so as to be able to move up and down. A flotator comprising: a rotor having a fixed crushing blade; a floss discharge section provided above a tank body; and a raw material recovery section provided below a liquid level below the tank body. 2. The floater according to claim 1, wherein a circulation path for circulating a part of the collected material to the supply port is opened in the material collecting section. 3. The floatator according to claim 1, wherein a draft tube and an outer cylinder forming a flow path between the outer periphery of the draft tube are relatively vertically movable at a central portion of the inside of the tank.