JP2009039598A - Wet-type medium stirring mill - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To form a large free space between a container 1 and a screen S to allow a mixed fluid of a medium and a slurry to efficiently flow in the free space to form a so-called circulating flow, and to prevent the screen S from being clogged. <P>SOLUTION: An agitating shaft 2 is arranged in a vertical direction in the vertical container 1 through which the slurry can pass. The agitating shaft 2 in the container 1 comprises a rotor 3 having a passage 3a enabling a movement of the medium and the slurry from the inner peripheral side to the outer peripheral side, and the screen S in the rotor 3, which is positioned at an annular space 3c following to an annular space 4 between the outer surface 3b of the rotor 3 and the inner wall 1a of the container 1, and separates the medium and the slurry. A bead seal 5 preventing the medium and the slurry after the separation passing through the screen S from being mixed is arranged between the container 1 and the rotor 3. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an improvement in a medium agitating mill that continuously pulverizes and disperses slurry in an annular space around a vertical agitation shaft disposed in a vertical container.

  In recent years, nanotechnology that refines raw materials has attracted attention. With the progress of this technology, higher quality of raw materials for electronic parts such as liquid crystal screens and plasma panels, and raw materials for capacitors and secondary batteries, that is, further miniaturization and uniform quality are desired. There are similar demands for pharmaceuticals and cosmetics.

  It is also known that it is effective to use as small a medium as possible in order to refine such raw materials. That is, the smaller the medium used, the finer the raw material. Therefore, a stirring mill has been proposed in which a mechanism for separating the medium and the slurry is devised so that the smallest possible medium can be used (for example, see Patent Document 1).

Japanese Patent No. 2680738

This stirring mill has a screen for separating the medium and the slurry at the end of the stirring shaft, and has a mechanism for discharging the slurry dispersed on the end face side of the container.
However, since a large space (space) cannot be formed between the end wall of the container and the end surface of the screen, the free flow in which the slurry reaches the space from the periphery of the screen through the screen and returns to the periphery of the screen is obstructed. It is won. As a result, if a minute medium having a diameter of 0.3 mm or less, particularly 0.1 mm or less is used, the screen is clogged, and thus does not function as a stirring mill.

  In order to eliminate the above drawbacks, in the present invention, a stirring shaft is arranged vertically in a vertical container through which slurry can pass, and the slurry is stirred together with the medium on the stirring shaft in the container. And a rotor having a passage capable of moving the medium and the slurry from the inner peripheral side to the outer peripheral side, and an annular space in the rotor that follows the annular space between the outer surface of the rotor and the inner wall of the container. And a bead that rotates with the rotor and separates the medium and the slurry, and prevents mixing of the dispersed slurry and medium that has passed through the screen between the container and the rotor. Place the seal.

  In this wet medium stirring mill, a screen for separating the medium and the slurry rotates together with the rotor, and the dispersed slurry separated from the medium through the screen is discharged out of the container. In this case, the annular space formed between the outer surface of the rotor and the inner wall of the container, the annular space in the rotor following the annular space, the medium and the slurry from the inner peripheral side to the outer peripheral side. A large free space is formed between the container and the screen, and a mixed fluid of the medium and the slurry efficiently flows in the free space, so-called circulation flow is formed.

  Therefore, even if a minute medium having a diameter of 0.3 mm or less, particularly 0.1 mm or less is used, the screen is not clogged, and the wet medium stirring mill can be operated stably. Further, since the stirring shaft is arranged in the vertical direction, the circulating flow can be generated evenly around the rotor, and the function of dispersing the slurry and the function of separating the medium and the slurry can be exhibited more stably.

  It is preferable that the slurry that has reached the screen through the annular space in the rotor is discharged out of the container from above through a passage that is a gap between the rotor and the stirring shaft. In this case, combined with the function of the bead seal, it is possible to completely prevent the medium from being mixed with the dispersed slurry separated by the screen.

  According to the first aspect of the invention, even if a minute medium having a diameter of 0.3 mm or less, particularly 0.1 mm or less is used, the screen is not clogged and the stirring mill can be operated stably. There is an effect that can be made. Further, since the stirring shaft is arranged in the vertical direction, the circulating flow can be generated evenly around the rotor, and the function of dispersing the slurry and the function of separating the medium and the slurry are more stably exhibited. effective.

  According to the second aspect of the invention, combined with the function of the bead seal, there is an effect that the medium can be completely prevented from being mixed with the dispersed slurry separated by the screen.

  An example of a wet medium stirring mill according to the present invention will be described in detail with reference to the drawings. FIG. 1 shows an internal structure of a wet medium stirring mill as an example of the present invention. As shown in FIGS. 2 (a) and 2 (b), the wet medium agitating mill A includes a vertical container 1 that is vertically attached to an arm b that extends horizontally from the body B. .

  A stirring shaft 2 is disposed in the container 1 in the vertical direction, and the stirring shaft 2 in the container 1 is provided with a rotor 3 for stirring the slurry together with the medium. As shown in FIGS. 3A and 4, the rotor 3 has four passages 3 a that can move the medium and the slurry from the inner peripheral side to the outer peripheral side at intervals of 90 degrees in a direction perpendicular to the axis. It has been drilled.

  An annular space 4 is formed between the outer surface 3 b of the rotor 3 and the inner wall 1 a of the container 1. An annular space 3c following the annular space 4 is formed in the rotor 3, and a screen S for separating the medium and the slurry is disposed in the annular space 3c, and the screen S is agitated. The cap 2a attached to the shaft end of the shaft 2 is attached to the shaft end of the stirring shaft 2 so as to rotate together with the rotor 3.

  A bead seal 5 is disposed between the container 1 and the rotor 3 to prevent mixing of the dispersed slurry and medium that has passed through the screen S. Further, the container 1 has an inlet 1b for pouring the slurry into the annular space 4 in the container 1 from above, and discharges the dispersed slurry from the upper part of the annular space 4 in the container 1 to the outside of the container 1. An outlet 1c is provided.

The slurry introduced into the annular space 4 from the inlet 1b is stirred and dispersed together with the medium by the rotation of the rotor 3, and reaches the screen S from the annular space 4 through the annular space 3c in the rotor 3, and this screen S Separated from the medium. Then, the dispersed slurry passes through the passage 6 which is a gap between the rotor 3 and the stirring shaft 2, reaches the outlet 1 c from above, and is discharged out of the container 1.

  In this case, the annular space 4 formed between the outer surface 3b of the rotor 3 and the inner wall 1a of the container 1, the annular space 3c in the rotor 3 following the annular space 4, the medium and the slurry. A wide free space is formed between the container 1 and the screen S by the passage 3a that can be moved from the inner peripheral side to the outer peripheral side, and the mixed fluid of the medium and the slurry efficiently flows in this free space, so-called circulation. A flow is formed.

  Therefore, even when a minute medium having a diameter of 0.3 mm or less, particularly 0.1 mm or less is used, the screen S is not clogged, and the wet medium stirring mill A can be stably operated. . Further, since the stirring shaft 2 is arranged in the vertical direction, the circulating flow can be generated evenly around the rotor 3, and the dispersion function of the slurry and the separation function of the medium and the slurry can be more stably performed. Demonstrate.

  Further, as described above, the slurry reaches the screen S through the annular space 3c in the rotor 3 by the rotation of the rotor 3, and is discharged out of the container 1 from above through the passage 6 which is a gap between the rotor 3 and the stirring shaft 2. Therefore, in combination with the function of the bead seal 5, it is possible to completely prevent the medium from being mixed with the dispersed slurry separated by the screen S.

  In FIG. 2, C is a container for storing slurry, D is a pressure gauge, and P is a pump for circulating the slurry. By this pump P, the slurry in the container C before dispersion is fed into the container 1 of the wet medium agitating mill A, and the slurry after dispersion in the container 1 is discharged from the container 1 and collected in the container C. it can. Moreover, in FIG. 1, 1d is an inlet of a cooling water (In addition, the outlet of a cooling water exists in the position which does not appear in FIG. 1).

It is a partially cutaway enlarged side view showing the internal structure of a wet medium stirring mill as an example of the present invention. It is a general view of the wet-medium stirring mill shown in FIG. 1, (a) is a front view, (b) is a side view. FIG. 2 is a schematic view showing only a rotor, (a) is an enlarged central longitudinal sectional view, and (b) is an enlarged plan view. It is an enlarged bottom view of a rotor.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Container, 1a ... Inner wall, 2 ... Stirring shaft, 3 ... Rotor, 3a ... Passage, 3b ... Outer surface, 3c ... Annular space, 4 ... Annular space, 5 ... Bead seal, 6 ... Passage, A ... Wet medium stirring mill .

Claims (2)

  A stirring shaft is arranged in a vertical direction in a vertical container through which the slurry can pass, and the stirring shaft in the container stirs the slurry together with the medium, and the medium and the slurry are separated from the inner peripheral side to the outer periphery. A rotor having a path that can be moved to the side, and located in an annular space in the rotor that follows the annular space between the outer surface of the rotor and the inner wall of the container, and rotates with the rotor to form the medium And a screen that separates the slurry, and a bead seal that prevents mixing of the slurry and the medium after dispersion that has passed through the screen is disposed between the container and the rotor. mill.   The wet-medium agitating mill according to claim 1, wherein the dispersed slurry that has reached the screen through an annular space in the rotor is discharged out of the container from above through a passage that is a gap between the rotor and the agitation shaft. .

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