JPH0147228B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a novel method and apparatus for solid-liquid separation of a suspension in which fine solid particles such as muddy water or chemicals are dispersed in a liquid medium.

Conventional solid-liquid separation of suspensions has typically used a centrifugal device. Generally, centrifugal filtration devices require removing cake from the fabric after a predetermined period of operation, making it difficult to operate continuously, and there is a limit to the amount of liquid that can be processed per unit time even if the device is enlarged.

In view of the above, the present invention can increase the amount of liquid processed per unit time with a small device,
Moreover, it is an object of the present invention to provide a solid-liquid separation method and an apparatus therefor that can be operated continuously.

The present invention has achieved the above object by continuously introducing a suspension into a centrifugal force field in a hollow rotating disk having a large number of discharge holes on its outer peripheral wall, and releasing the suspension into the air from the discharge holes. This is achieved by a solid-liquid separation method and apparatus in which a liquid medium is atomized and dropped within a certain distance from the outer periphery of a hollow rotating disk by a downward air flow, and solid particles are dropped outside of the atomized liquid medium.

Hereinafter, the method and apparatus of the present invention will be explained in detail.

An embodiment of the apparatus used in the method of the present invention is shown in FIGS. 1-3.

A hollow rotary disk 2 with a downward opening and having a large number of discharge holes 1 in its outer circumferential wall is horizontally installed so as to be rotatable integrally with the output shaft of a transmission 3. Pulley 4 on the input side of transmission 3
is connected to a pulley 6 on the drive side of the motor 5 via a V-belt 7. A liquid introduction pipe 8 having a discharge port 8a above is arranged so as to be able to continuously introduce the suspension into the centrifugal force field of the hollow rotating disk 2. Further, a funnel-shaped (cylindrical) liquid medium receiver 9 and a funnel-shaped (cylindrical) solid particle receiver 11 are arranged on the inner side and the outer side of the hollow rotary disk 2, respectively, with the axis centered on the hollow rotating disk 2. There is.

A liquid recovery pipe 12 is connected to the bottom of the liquid medium receiver 9, and the liquid recovery pipe 12 communicates with an exhaust chamber 14 equipped with an exhaust fan 13.The exhaust chamber 14 includes a liquid drain pipe 15 at its bottom. ing. Moreover, the height of the outer peripheral wall of the liquid medium receiver 9 is
It is set slightly lower than the lower end position of the discharge hole 1 of the hollow rotating disk 2.

A particle collection chute 16 is provided at the bottom of the fixed particle receiver 11, and its outer circumferential wall height is higher than the upper end position of the discharge hole 1 of the hollow rotating disk 2. Air intake holes 1 are arranged radially above the outer periphery of the hollow rotating disk 2 of 17.
A plurality of 9 are provided.

Next, a method for solid-liquid separation of a suspension using the above device will be explained.

First, the motor 5 is operated to rotate the hollow rotary disk 2 at high speed via the transmission 3 (20000~
30000rpm). Then, a centrifugal force field is generated outward from the axis of the hollow rotating disk 2.

A liquid introduction pipe 8 introduces a suspension such as muddy water into this centrifugal force field.
The liquid is introduced through a pump or the like (not shown).
Then, the suspension is transferred to the outer peripheral wall side due to the centrifugal effect, and at the same time is released into the air through the release hole 1. At this time, the ejection direction is the tangential direction of the rotating disk 2, as shown by the arrow in FIG. 3, and the ejection speed is the circumferential speed of the disk. For example, when the disc diameter is 20 cm and the rotation speed is 14,800 rpm, the peripheral speed is about 155 m/s. In this way, the solid particles and the liquid medium are released into the air at high speed, and since the fixed particles have a high specific gravity (usually 2 or more), they almost never fall and instantly hit the inner peripheral wall of the solid particle receiver 11. The liquid medium collides with the liquid medium, falls along the inner peripheral wall, and is collected from the recovery chute 16. On the other hand, the liquid medium is rapidly diffused from the compressed state in the discharge hole 1, so that it is atomized, and the specific gravity of the liquid medium itself is also small. (Usually 1
(below) Moreover, since the air flow is caused by the exhaust fan 13 to the bottom side of the liquid medium receiver 9, most of the atomized liquid medium reaches the bottom side of the liquid medium receiver 9 by the time it reaches the outer peripheral wall of the liquid medium receiver 9. While being sucked into the liquid droplet, the liquid passes through the liquid recovery pipe 12,
The liquid is recovered through the exhaust chamber 14 and further through the liquid drain pipe 15.

In the above embodiment, if the hollow rotary disk 2 can cause an air flow from above to below, it is not necessarily necessary to provide the exhaust chamber 14 with the exhaust fan 13. Furthermore, the liquid medium is not necessarily limited to water, but may also be an organic solvent such as alcohol or toluene. Note that a portion of the solid fine particles S is deposited as shown by the two-dot chain line in FIG. 3, and serves to prevent wear of the outer peripheral inner wall of the hollow rotating disk 2. Therefore, only the area around the discharge hole 1 needs to be made of a wear-resistant material so that it can be replaced.

Since the solid-liquid separation method and apparatus of the present invention have the above-described method and configuration, a large liquid throughput per unit time can be obtained with a small-sized apparatus, and moreover, continuous operation is possible. Furthermore, as a result of experiments using a prototype machine, we were able to achieve a separation of 250 mesh (600 μm) or less, which was considered impossible with conventional solid-liquid separation by centrifugation.
It was found that solid-liquid separation was possible up to a suspension containing solid particles of 30 μm.

[Brief explanation of drawings]

The illustrated examples illustrate the present invention; FIG. 1 is a schematic cross-sectional view of a solid-liquid separator used in the method of the present invention, FIG. 2 is an enlarged cross-sectional view of a hollow rotating disk, and FIG.
FIG. DESCRIPTION OF SYMBOLS 1...Discharge hole, 2...Hollow rotating disk, 8...Liquid introduction pipe, 8a...Discharge port, 9...Liquid medium receiver, 11...Solid particulate receiver, S...Solid particulate.

Claims (1)

[Scope of Claims] 1. A suspension is continuously introduced into a centrifugal force field in a hollow rotating disk having a large number of discharge holes in its outer peripheral wall, and the suspension is discharged into the air from the discharge holes. A solid-liquid separation method comprising: atomizing the liquid medium and causing it to fall within a certain distance from the outer periphery of the hollow rotary circle by a downward air flow, and causing solid particles to fall on the outside thereof. 2. A hollow rotating disk equipped with a large number of discharge holes on the outer circumferential wall is installed horizontally at a predetermined position so as to be able to rotate at high speed, and a liquid introduction pipe is provided so that the suspension can be continuously introduced into the centrifugal force field of the hollow rotating disk. A cylindrical liquid medium receiver is provided on the inner side, and a cylindrical solid particle receiver is provided on the outer side, extending downward from the outer periphery of the hollow rotating disk and centered on the axis of the hollow rotating disk. are arranged concentrically, the height of the outer peripheral wall of the liquid medium receiver is lower than the lower end position of the discharge hole of the hollow rotating disk, and the height of the outer peripheral wall of the solid particulate receiver is higher than the upper end position of the discharge hole. , a solid-liquid separator further configured to generate a downward air flow in the liquid medium receiver.