JPS63291611A - Ultrasonic wave filtration and classification device - Google Patents

Abstract

PURPOSE:To obtain an apparatus capable of coping with the demand for high preciseness of filter material and concentration of slurry liquid, by making the inside of filter material an inlet side of slurry liquid and the outside thereof a ultrasonic vibration region. CONSTITUTION:Slurry liquid 1 in a slurry liquid tank 13 is drawn by a pump 14 and forced to the inside of a rotating filter material 5 through a slurry liquid inlet pipe 4 to be classified and filtered by the filter material 5 and discharged through a filtered liquid outlet 9 to the outside to be recovered, whereas part of the slurry liquid, without going through classification and filtration, is returned to the slurry liquid tank 13 through a recycle pipe 8 formed in one body with the filter material 5. And a horn of a ultrasonic wave vibrator 11 is placed against the outer side of said filter material 5, therefore, the outside surface of the filter material 5 is brought into the vibrating region successively by the rotation of the filter material 5, so that the filter material 5 is successively regenerated by the cooperating action between the vibrating action and the recycled liquid 2 of slurry liquid 1 supplied into the filter material 5, causing the recycled liquid 2 to be returned to the tank 13 from the recycle pipe 8.

Description

DETAILED DESCRIPTION OF THE INVENTION [Objective of the Invention] (Industrial Application Field) The present invention relates to an apparatus for filtering and classifying fine powder dispersed in a slurry liquid using ultrasonic waves.

(Prior Art) A conventional ultrasonic filtration and classification device is shown in FIG.

That is, in this conventional fM arrangement, the slurry liquid flow pipe (b) 8 and the ultrasonic vibrator 2 both face the outside of the cylindrical filter media opening rotating in the pressure vessel A, and the inside of the filter media opening Since the filtrate discharge pipe faces the filtrate discharge pipe E, the pressure on the inflow side of the slurry liquid is restricted.

For this reason, due to the high precision of the filter media opening and the concentration of the slurry liquid, the flow rate of the filtrate drops significantly, resulting in an extremely low throughput, which has a serious flaw that makes the device itself impractical. was.

(Problems to be Solved by the Invention) The present invention was made in view of the current situation of conventional devices, and the inside of the filter medium is used as the slurry liquid inflow side, and the outside (filtrate exit side) is used as the ultrasonic oscillation area. By doing so, it is possible to provide a filtration/classification device having a processing capacity that can handle the concentration of the slurry liquid and the high precision of the filter medium.

[Structure of the Invention] (First Embodiment) The following will be described with reference to the embodiments shown in the drawings. In FIG. 1, numeral 10 is a pressure vessel, and 5 is a cylindrical filter medium provided inside thereof with rotational motion. Although the rotating means is not shown in the same figure, as shown in FIG. Connect to the end and rotate.

Then, from outside the pressure vessel 10, a slurry liquid flow pipe 4 is made to face the inside of the filter medium 5 irrespective of the rotation of the filter medium 5, and an ultrasonic wave is applied to the outside of the filter medium 5 (on the filtrate outlet side). It is constructed by facing the horn 11 (homogenizer) of the vibrator and providing a filtrate discharge port 9 at an appropriate position outside the oscillation area.

In the figure, 6 is an end cap of the cylindrical filter medium 5, and 7 is a boss cap.

FIG. 2 schematically shows the entire filtration circulation path incorporating the above-described device of the present invention.

(Function) The slurry liquid 1 in the slurry liquid tank 13 is pumped 14
The slurry is sucked into the slurry liquid flow pipe 4 and is forced into the inside of the rotating filter medium 5. At this time, a part of the pumped slurry liquid is returned to the tank by operating the flow rate adjustment valve 15, and appropriate pumping conditions are set for the contents of each slurry liquid and the opening of the filter medium. Check on 16.

Now, the slurry liquid 1 that has been pressure-fed inside the filter medium 5 is
The slurry liquid is classified and filtered, guided from the filtrate outlet side to the discharge side, and recovered outside the device. However, a part of the slurry liquid is passed through the recycling pipe 8, which is integrated with the filter medium 5, without being classified or filtered, into the slurry liquid tank 13. brought back inside.

At this time, the amount of circulating fluid and the inflow pressure are determined by the flow chamber adjustment valve 15.
In addition to this, it is determined by operating the circulation adjustment valve 20.

Now, to explain the classification and filtration action in detail, in the present invention, the vibrator horn 11 is located on the filtrate outlet side of the filter medium 5 (i.e., the side opposite to the liquid pressure feeding side) so that it can irradiate ultrasonic waves. Because it is made of iron, it does not increase the load on the ultrasonic oscillator or reduce the cavitation effect even when flowing at a considerable pressure (several to tens of times the pressure compared to conventional devices). Particles having a particle size smaller than the opening of the filter medium 5 pass through the filter medium 5 and are collected as the filtrate 3 from the discharge port 9. At this time, particles with a particle size larger than the opening of the filter medium 6 are temporarily captured on the inner surface of the filter medium 5, and the inflowing particles promote the formation of a cake layer. Since the outer surface of the filter medium 5 is sequentially transported to the ultrasonic oscillation area, the filter medium 5 is sequentially regenerated due to the vibration effect and the cooperative action of the slurry liquid 1 supplied into the filter medium 5 with the recycling liquid 2, and its recycling The liquid 2 is returned to the tank 13 through the recycle pipe 8.

(Second example) Another embodiment of the invention is shown in FIG.

That is, in the same figure, a flat filter medium 5 is fixed in the middle of the pressure vessel IO through a support ring 24, and the filter medium 5
The slurry flow pipe 4 and the recycle pipe 8 are facing on one side (inside), and the horn 11 of the ultrasonic vibrator is facing on the other side (i! filtrate outlet side), and the filtrate discharge port is located at an appropriate position. 9 will be provided.

(Function) The function when this is incorporated into the above-mentioned circulation filtration path is exactly the same as that of the first embodiment.

[Effects of the Invention] The present invention is as described above, and as a result of irradiating ultrasonic waves with the vibrator horn located on the filtrate outlet side of the filter medium (i.e., the side opposite to the liquid pressure feeding side), the load on the ultrasonic oscillator is reduced. The slurry liquid 1 can be flowed in at the required pressure without increasing the pressure or reducing the effect of cavitation, and the filtration accuracy is high, allowing smooth classification and filtration even in a filter medium that is difficult to flow.

Particles with a diameter larger than the opening of the filter medium are temporarily captured on the inner surface of the filter medium, and the inflowing particles promote the formation of a cake layer. Due to the cooperation of the slurry liquid 1 supplied inside with the recycle liquid, the slurry liquid 1 is returned to the tank 13 together with the recycle liquid 2, and the filter medium is successively regenerated. This can significantly improve filtration efficiency.

The usage results of the first embodiment of the device of the present invention will be shown in comparison with the conventional Ha mentioned above. First, in the device of the present invention, the frequency of the ultrasonic transducer: 19 KHz Iε material;
Wire mesh laminated filter medium Nominal 1,4zm filter medium surface H4:
10.6 cm2 Gap between the tip of the vibrator horn and the filter medium; 3 mm Under the above conditions, 100 gr of silicon oxide powder (average particle size 1.65 - measured value with a two-coulter counter) was mixed with water (0.45/ml).
filtered through a P membrane filter) suspended in 10 pieces (slurry concentration 1.0 wt%),
Classification and filtration were performed at a differential pressure of n''G.

The results are shown in (A) of the table in FIG.

In this table, the horizontal axis shows the total classification and filtration amount V (m)), and the vertical axis shows the throughput per unit time dV/dθ (m7/min
).

In contrast, in the conventional device, the ultrasonic transducer, the filter medium, the area of the filter medium, the gap between the tip of the vibrator horn and the filter medium, and the slurry liquid under the same conditions as the device of the present invention are 0.5
Classification and filtration were performed at a differential pressure of Kg/cm'G.

The results are shown in (B) of the table in FIG.

The comparison between (A) and (B) confirms the superiority of the apparatus of the present invention in terms of classification and filtration amount.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional side view of a main part of an embodiment of the device of the present invention, FIG. 2 is a schematic side view incorporating the device of the invention, and FIG. 3 is a longitudinal sectional view of a main part showing another embodiment of the device of the present invention. FIG. 4 is a side view of the main part of the conventional device, and FIG. 5 is a comparative usage record table of the device of the present invention and the conventional device. 1----Slurry liquid, 4-m-Slurry liquid flow pipe, 5-
m-filter medium, 8-m-recycle pipe, 9-m-filtrate outlet, 10-m-pressure vessel, 11-m-horn of ultrasonic vibrator, 12-m-ultrasonic vibrator, 17-- - motor,
18-m-Transmission system. Patent applicant Fuji Filter Industry Co., Ltd. agent (64)
40) Patent Attorney Fuku 1) Shangfuwang-men 311 5,, Figure 31! ↓”21

Claims (1)

[Claims] 1) A filter medium provided in a pressure vessel is characterized in that a slurry liquid flow tube is placed inside the filter medium, and an ultrasonic vibrator is placed outside the filter medium, that is, on the filtrate outlet side. , ultrasonic filtration and classification equipment. 2) The ultrasonic filtration and classification device according to claim 1, wherein the filter medium has a cylindrical shape and is subjected to rotational motion. 3) The ultrasonic filtration and classification apparatus according to claim 1, wherein the filter medium is flat and fixed via a support ring.