JPH0615116A - Horizontal vacuum filter - Google Patents

Abstract

(57) [Abstract] [Purpose] It is possible to smoothly and surely treat an object that is difficult to wash cake, and to perform one cake washing process with one filter. It is an object to provide an inexpensive and space-saving horizontal vacuum filter. [Structure] The cake 16 washed by the first vacuum box part 4 provided in the preceding stage of the repulsion part 13 is returned to a slurry state by the repulsion part 13, and then the cake 16 provided in the subsequent stage of this repulsion part 13 is returned. The cake is washed again by the vacuum box unit 2 of 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention has an endless filter cloth movably provided on the upper surface of a vacuum box, and by vacuum suction of the vacuum box, solid-liquid separation of an object to be treated such as slurry on the endless filter cloth. The present invention relates to a horizontal vacuum filter for carrying out washing and dehydration, and more particularly to a horizontal vacuum filter for treating an object to be treated which cannot sufficiently wash the inside of a cake by one solid-liquid separation, washing and dehydration.

[0002]

2. Description of the Related Art Generally, for an object to be treated which requires cake washing, washing water is sprayed from the upper surface of the cake after filtration to wash the cake.
The washing water may not be able to sufficiently wash because it is difficult to penetrate into the cake. In the past, when performing cake washing of such an object to be treated, after dehydration and washing with one filter, the cake was put into a hopper equipped with a crusher, and washing water was added. It was supplied to make a slurry, and again dehydrated and washed by another filter.

[0003]

However, in the conventional cake washing described above, since two filters are required, there are problems such as high cost and increased installation area.

The present invention has been made in view of the above circumstances, and an object of the present invention is to smoothly and reliably process an object to be cake-washed, which is difficult to wash, and to provide one filter. Therefore, it is an object of the present invention to provide a horizontal vacuum filter which can carry out a series of cake washing processes and which is inexpensive and space-saving.

[0005]

In order to achieve the above object, the present invention provides an endless filter cloth movably on the upper surface of a vacuum box, and the slurry on the endless filter cloth is evacuated by vacuum suction of the vacuum box. In a horizontal vacuum filter for performing solid-liquid separation of the object to be treated, etc., and washing and dehydrating, the above vacuum box parts are provided at a plurality of positions separated by a predetermined interval, and between these vacuum box parts. A liquefaction device for liquefying the dehydrated object to be treated is provided.

[0006]

In the horizontal vacuum filter of the present invention, the object to be treated, which has been cake-washed by the vacuum box provided in the preceding stage of the liquefying apparatus, is returned to the liquid state (slurry state) by the liquefying apparatus. After that, the cake is washed again by the vacuum box portion provided in the latter stage of the liquefaction device.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be described below with reference to FIGS.

In these drawings, reference numeral 1 is a frame 2
It is an endless filter cloth stretched on a large number of guide rolls 3 rotatably installed on the horizontal portion 1a of the endless filter cloth 1 (see FIG.
The first vacuum box part 4 is arranged in the lower part of the left side. The endless filter cloth 1 on the first vacuum box section 4 is divided into a cake forming section, a washing section, and a dehydrating section, respectively. In addition, the horizontal portion 1 of the above endless filter cloth 1
A slurry supply device 6 and a cleaning device 7 are provided above the a in a state of being connected to each other by a connection member 5 so as to be reciprocally movable in the horizontal direction.
Supplies the slurry to the cake forming section,
The cleaning device 7 is adapted to supply cleaning water to the cleaning section. A horizontal cylinder 8 that horizontally moves the slurry supply device 6 and the cleaning device 7 is connected to the slurry supply device 6.

On the downstream side of the horizontal portion 1a of the endless filter cloth 1, an inclined portion 1c is arranged via a folded portion 1b. Then, the horizontal portion 1a and the folded portion 1
The guide roll 3 and the inclined portion 1 arranged between the guide roll 3 and
Each of the guide rolls 3 arranged at the downstream end of c is
Scrapers 9 and 10 are provided via the endless filter cloth 1, and a scraper 11 is in contact with the guide roll 3 arranged between the folded-back portion 1b and the inclined portion 1c. Further, the repulsion portion 1 for accommodating the repulsion liquid 12 is provided below the inclined portion 1c of the endless filter cloth 1.
3 and a second vacuum box portion 14 for sucking the repulsor liquid 12 are integrally connected to each other, and are vertically adjusted about a fulcrum 15 below the repulsor portion 13 as a center. It is provided freely. Then, in the repulsion section 13, a stirrer 17 for crushing the cake 16 and
Partition plates 18 for partitioning the liquid surface of the repulsion liquid 12 are provided respectively, and the guide roll 3 and the stirrer 1 arranged between the folded portion 1b and the inclined portion 1c.
Nozzles 19 for supplying repulsion water to 7 and
It is arranged above the stirrer 17. Further, the endless filter cloth 1 on the second vacuum box section 14 is divided into a cake forming section, a washing section, and a dehydration section, respectively, like the endless filter cloth 1 on the first vacuum box section 4. The cleaning device 20 is provided above the cleaning section so as to be movable along the inclination of the inclined portion 1c. An inclination cylinder 21 that reciprocates the cleaning device 20 is connected to the cleaning device 20.

At the lower part of the frame 2, a pair of holding members 22 and 23, which are longer than the lateral width of the endless filter cloth 1, sandwich the endless filter cloth 1 in the direction orthogonal to the running direction of the endless filter cloth 1. It is installed at the top and bottom in the state. A clamping cylinder (not shown) is provided on both sides of the upper clamping member 22.
Are respectively attached, and the piston rods of these holding cylinders are connected to the lower holding member 23. As a result, when the holding cylinder is operated, the holding member 23 approaches and separates from the holding member 22, and the endless filter cloth 1 is disengaged between the holding members 22 and 23. Both sides of the upper sandwiching member 22 are connected to a traveling carriage 24, and the traveling carriage 24 is mounted on a support member 25 fixed to the frame 2 so as to be movable along the traveling direction of the endless filter cloth 1. It is placed. One end (the left end in FIG. 1) of the piston rod 27 of the moving cylinder 26 suspended from the frame 2 is connected to the central portion in the length direction of the holding member 22. Further, a cleaning pipe 28 is connected to the other end (right end in FIG. 1) of the piston rod 27 of the moving cylinder 26,
A cleaning nozzle 29 for cleaning the endless filter cloth 1 from which the cake has been peeled off is provided at the tip of the cleaning pipe 28 and is surrounded by a cover 30 for preventing scattering of cleaning water. And
By operating the holding cylinder and the moving cylinder 26, the endless filter cloth 1 is intermittently moved in one direction at a constant time by a constant stroke, and the cleaning pipe 28 is reciprocated. It is like this. Furthermore, when the endless filter cloth 1 is moved, the vacuum suction state of each of the vacuum boxes 4 and 14 is automatically returned to atmospheric pressure.

In the horizontal vacuum filter constructed as described above, by repeating the operations of the clamping cylinder and the moving cylinder 26, the endless filter cloth 1 is moved in a certain direction (in the directions of arrows in FIGS. 1 and 2). Can be moved intermittently. At this time, the slurry is uniformly supplied to the cake forming section on the first vacuum box part 4 by the slurry supply device 6, and the cleaning water is evenly sprayed to the cleaning section by the cleaning device 7, The cake 16 formed in the washing section is washed, while the cake 16 after washing is vacuum-sucked in the dehydration section to be dehydrated and dried.

Next, when the cake 16 reaches the downstream end of the horizontal portion 1a of the endless filter cloth 1, the cake 16 is separated from the endless filter cloth 1 by its own weight or scraped off from the endless filter cloth 1 by the scraper 9 and stirred. It drops onto 17 and is crushed by this agitator 17. Then, re-pulper water is supplied from the nozzle 19 to the cake crushed by the stirrer 17, impurities in the cake are washed, and the re-pulper liquid 12 is stored in the re-pulper portion 13. Further, the repulsor water supplied from the nozzle 19 is also sprayed on the surface of the guide roll 3 near the scraper 11, and scrapes off the repulsor liquid 12 adhering to the surface of the guide roll 3 and rising.

Subsequently, the repulsion liquid 12 contained in the repulsion part 13 passes below the partition plate 18 as the endless filter cloth 1 moves, and then passes through the second vacuum box part 14.
When it reaches the upper side, vacuum is sucked in the cake forming section on the second vacuum box portion 14 to re-form the cake, and at the same time, the washing water is sprinkled evenly on the washing section by the washing device, and in the washing section. The cake is washed,
Further, in the dehydration section, the washed cake is vacuum-sucked to be dehydrated and dried, and then scraped off from the endless filter cloth 1 by the scraper 10 and collected.
On the other hand, the endless filter cloth 1 on which the cake has been scraped off is covered with 3
When the temperature reaches 0, cleaning water is supplied by the cleaning nozzle 29 for cleaning.

[0014]

As described above, according to the present invention, the endless filter cloth is movably provided on the upper surface of the vacuum box, and the object to be treated such as slurry on the endless filter cloth is sucked by the vacuum suction of the vacuum box. While performing solid-liquid separation, in a horizontal vacuum filter for washing and dehydration, the vacuum box parts are provided at a plurality of positions with a predetermined spacing, and between these vacuum box parts,
Since the liquefaction device for liquefying the dehydrated object to be treated is provided, the object to be cake washed by the vacuum box portion provided in the preceding stage of the liquefaction apparatus is treated by the liquefying apparatus. After returning to the liquid state (slurry), the vacuum box part provided at the latter stage of the liquefaction device can wash the cake again, so that the object which is difficult to wash the cake can be smoothly and surely treated. As a result, one cake washing process can be carried out by one filter, and at a low cost, it is possible to obtain a desired dehydration effect and washing effect to obtain a homogeneous product.

[Brief description of drawings]

FIG. 1 is a front view showing an embodiment of the present invention.

FIG. 2 is a front view showing a repulsion unit.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Endless filter cloth 4 1st vacuum box part 12 Re-pulper liquid 13 Re-pulper part (liquefaction apparatus) 14 2nd vacuum box part 16 Cake (processing object)

 ─────────────────────────────────────────────────── ─── Continued Front Page (72) Inventor Kazuhiro Nose 2-17-15 Tsukushima Machinery, Chuo-ku, Tokyo Tsukishima Machinery Co., Ltd. (72) Inventor Koichiro Sekine 2-17-15 Tsukushima, Chuo-ku, Tokyo Tsukishima Machinery Within the corporation

Claims (1)

[Claims] 1. An endless filter cloth is movably provided on an upper surface of a vacuum box, and a vacuum suction of the vacuum box performs solid-liquid separation of an object to be treated such as slurry on the endless filter cloth and washing. In a horizontal vacuum filter for dehydration, the vacuum box portions are provided at a plurality of positions with a predetermined gap therebetween, and between these vacuum box portions, a liquefaction device for liquefying the dehydrated object to be treated is provided. A horizontal vacuum filter characterized by being provided.