JPS62114616A - Horizontal vacuum filtering method and apparatus - Google Patents

Abstract

PURPOSE:To perform efficient countercurrent washing by a reduced amount of a washing solution and to enhance dehydration effect, by making it possible to easily form a plurality of homogeneous and uniform layers of a slurry on filter cloth. CONSTITUTION:A plurality of thin layers of a substance to be treated are formed on filter cloth 1 byhh repeatedly supplying the substance to be treated onto said filter cloth 1 to form a cake with a uniform thickness on the entire surface of the upper filter cloth of the cake forming section of a vacuum tray 13. Subsequently, this cake is transferred to a washing section 11 along with the filter cloth 1 and washed but, because of the uniform cake layer, the washing solution becomes easier to diffuse over the entire surface of the cake layer and there is no irregularity in the diffusion of the washing solution per unit cake wt. Further, the washed cake is dehydrated in the dehydration section 12 of the rear stage. In this case, because the cake layer is uniform, the filtrate and passing air in the cake are averagely sucked under vacuum without wastefulness and dehydration effect is enhanced.

Description

[Detailed Description of the Invention] "Industrial Application Field" The present invention is applicable to the chemical industry, mining industry, food industry, etc.
Horizontal type used when filtering and dehydrating materials with thick constituent particles (or thick ones), and when performing filtration with countercurrent washing to recover useful components attached to the constituent particles. ``Prior art'' regarding vacuum filtration method and device Conventionally, when performing this type of ρM filtration with countercurrent cleaning, a rubber belt that moves horizontally and a vacuum tray fixedly placed below the belt are used. , one that filters the slurry on the filter cloth on the rubber belt and separates the filtrate in the empty tray by a rubber belt filter, or one that removes the rubber belt and moves the vacuum tray back and forth over a predetermined distance, It is known to perform filtration only while the vacuum tray is synchronized with a filter cloth running in a fixed direction.

"Problems to be Solved by the Invention" However, in the former case where a rubber belt is used, the rubber belt is required to have a vacuum-resistant structure, which complicates the overall structure and increases its weight. There is a problem. Therefore, the initial and running costs are relatively high.

In addition, in the latter case where the vacuum tray is moved back and forth, a rubber belt is no longer necessary, but the vacuum tray to be moved is made of a vacuum-resistant structure, so a strong structure is required, which increases the weight. Therefore, there is a problem in that a drive device that operates this heavy moving part requires a large amount of power consumption.

As described above, the conventional technology has problems such as a complicated structure, a heavy load design associated with it, and relatively high maintenance costs.

The present invention has been made in view of the above-mentioned circumstances, and its purpose is to easily form a plurality of homogeneous and uniform layers of slurry on a filter cloth, and to facilitate the subsequent washing process or dehydration process. An object of the present invention is to provide a simple and inexpensive horizontal vacuum filtration method and device that can efficiently perform countercurrent cleaning with a small amount of cleaning liquid and enhance the dehydration effect.

"Means for Solving the Problems" In order to achieve the above object, the method of the present invention provides a method for supplying a material to be treated, such as slurry, onto a filter cloth that moves intermittently in one direction, within a predetermined range. The device of the present invention forms multiple layers of the material to be treated on the filter cloth by repeatedly supplying the material to be treated in the longitudinal direction of the filter cloth. An endless filter cloth that is intermittently moved by a drive device is provided above the vacuum tray placed in the vacuum tray, and a processing material supply means for supplying processing material and a cleaning liquid are supplied above the endless filter cloth. A cleaning liquid supply means is provided for cleaning, and a supply port of the object supply means is provided so as to be movable in the length direction of the endless filter cloth.

"Operation" In the horizontal vacuum filtration method and apparatus of the present invention, by forming multiple thin layers of the material to be treated on the filter cloth,
A cake of uniform thickness is formed on the entire surface of the upper filter cloth in the cake forming section of the vacuum tray.

Next, this cake is transferred to the washing section together with the filter cloth and washed. At this time, since the cake layer is uniform, the washing liquid is easily spread over the entire surface of the cake layer (the amount of washing liquid applied per unit cake weight) In addition, the washed cake is dehydrated in the subsequent dehydration section.In this case, since the cake layer is uniform, the filtrate and passing air in the cake are vacuum-sucked evenly, without waste. And has a high dehydration effect.

"Embodiment" Hereinafter, an example of winding the present invention will be described based on FIGS. 1 to 11.

Reference numeral 1 in the figure is a filter cloth, and this filter cloth 1 is 1. It is an endless roll wound around the drive drum 2, a plurality of (four in FIG. 1) filter cloth support rolls 3.4, 5.6, and the guide drum 7.

A scraper 8 for scraping off the cake on the filter cloth 1 is provided near the drive drum 2.

Further, the filter cloth support roll 4 is provided with a tension tension device 9 for adjusting the tension of the filter cloth 1. Furthermore, a cleaning device (not shown) for cleaning the filter cloth 1 is provided close to the filter cloth 1 below the drums 2.degree. 7 together with a water spray nozzle.

At the bottom of the horizontal portion 1a of the filter cloth 1 is a cake forming section 10. A vacuum tray 13 divided into three sections, a washing section 11 and a dehydration section 12, is fixedly installed. These 3
The two compartments 10, 11.12 each independently have a control valve (10a, 10b).

(lla-11b), (12as12b) and filtrate tank 10
c, 11c, 12c, and each filtrate tank 10
c e 11 c * 12 Q is the vacuum pump 14
and filtrate pump 15, and each compartment 10.11.12 can be operated independently to operate the required vacuum pressure.

Further, a pair of rails 16 is disposed above the horizontal portion 1a of the filter cloth 1, and a support 18 is reciprocated on both rails 16 by a cylinder device 17. This support 18 is provided with a slurry nozzle (slurry supply port) 19 for dropping slurry, and a fixed vibrator 2 for slurry supply is connected to the slurry nozzle 19 via a flexible hose 20.
1 are connected. And the slurry nozzle 19
is adapted to reciprocate above the cake forming section 10 by the cylinder device 17. Further, at an upper position of the cleaning section 11 near the cake forming section 10, a cleaning liquid nozzle 22 is installed, separate from the rail 16, for supplying the cleaning liquid to the upper part of the cleaning section 11.
is fixed to the filter frame.

Regarding the case where the method of the present invention is implemented using the horizontal vacuum filtration apparatus configured as described above, FIGS.
This will be explained based on FIG.

First, as shown in FIG. 4, on the horizontal portion 1a of the filter cloth 1,
In the state where slurry is not supplied, each compartment 1
0, 11.12, vacuum suction is not performed (Figure KTh
(represented by the symbol ■). In this state,
The filter cloth 1 is moved from left to right at a predetermined speed by the drive drum 2, and slurry is supplied onto the cloth 1 from the slurry nozzle 19. At this time, the slurry nozzle 1
9 is fixed above the left end of the cake forming section 10 (.

As a result, a predetermined amount of slurry is supplied onto the filter cloth 1,
Next, as shown in FIG. 5, when the tip of the slurry supplied onto the filter cloth 1 reaches the right end position of the cake forming section 10, the movement of the filter cloth 1 is stopped. As a result, a thin layer of slurry s1 is formed on the filter cloth 1 in the upper part of the cake forming section 10.

Next, by vacuum suctioning the cake forming section 10 (represented by the symbol ○ in the figure), the first layer of slurry s1 is turned into a cake, and at the same time, the cylinder device 17 is actuated, Above slurry nozzle 1
Move 9 to the right. As a result, as shown in FIG. 6, the second layer of slurry 19 is inverted and moved to the left on top of the first layer of slurry (cake forming layer) Sl. As a result, as shown in FIG.
Cake forming layer) S3 are stacked to form a three-layered cake. Then, when the slurry nozzle 19 reaches the left end of the cake forming section 10, the movement of the slurry nozzle 19 is stopped.

Subsequently, by moving the filter cloth 1 again, the cake layer 1 of the three-layer structure is transferred to the washing section 11, and the first layer is newly added to the rear part of the cake layer 1 as described above. A slurry layer S1 is formed.

At this time, while the filter cloth 1 is being moved, the vacuum suction to each section 10, 11 and 12 is stopped, and the washing liquid is supplied from the washing liquid nozzle 22 to the cake layer 1 that has been transferred onto the washing section 11. (See Figure 8).

Furthermore, as shown in FIG. 9, the slurry nozzle 19 is moved to the right and slurry is supplied from the bottom to form a second layer of slurry (cake forming layer) S on the upper part of the cake forming section 10. , cake forming section 10. Washing section 11
Vacuum. As a result, a cake forming layer having a uniform two-layer structure is formed in the cake forming section 1o, and at the same time, in the washing section 11, the above 3/? 1 is washed into the cake layer of 1 structure, and the useful components in the layer are recovered.

Next, as shown in FIG. 10, slurry is supplied while moving the slurry nozzle 19 to the left to form a third slurry layer S3 on the second slurry layer S. Then, the vacuum suction to each section 10, 11° 12 is stopped, and the filter cloth 1 is moved forward by one section. As a result, a new first layer of slurry s is added onto the cake forming section lo.
1 is formed, and in the washing section 11, 2 is transferred to the cake layer, and in the dewatering section 12, 1 is transferred to the cake layer washed in the washing section 11. The slurry nozzle 19 is then moved to the right and vacuum suction to each compartment 10.11.12 is resumed.

In this way, in the cake forming section 10, a thin 3
By stacking the layers of slurry S (r S2 h S3 ) one after the other, the slurry layer becomes uniform and homogeneous over the entire surface, thereby smoothly homogenizing the cleaning liquid in the next-stage cleaning section 11. It is dispersed and spread on the cake layer, and easily penetrates into the cake layer to uniformly wash the cake. It is easy to carry out, and the dehydration effect is generally enhanced.
The washing liquid supplied from 2 mainly washes the cake in the washing section 11, but by adjusting the liquid 1, it can also wash the cake in the dehydration section 12.

Clothing 1 specifically shows the above effect. In this table, the slurry used as a sample has the name of the substance to be treated -
Gypsum particle size: 130 microns Slurry concentration: 1g wet Washing liquid foam: Number of layers of slurry in Mizuki Mizuki example: 3 Comparative number of layers of slurry: 1 As a comparative example, a horizontal vacuum filtration method using a vacuum tray moving method was used. Table 1 As shown in Table 1, this practical example shows the dehydration effect, the amount of cleaning liquid,
It was found that it was superior to the comparative example in all respects including power consumption.

In the above example, one vacuum tray 13 is explained, but the vacuum tray 13 may be arranged in parallel in multiple stages to enhance the cleaning effect. Slurry nozzle 1 as a means of supplying the processed material
9. Flexible hose 20. Using the slurry supply fixed pipe 21, connect the slurry nozzle 19 to a cylinder [1t]
17, but the present invention is not limited to this. For example, it may be swung left and right as shown by the two-dot chain line in FIG. As shown in FIG.
A rotatable dispersion plate 32 is provided below the slurry nozzle 19, as shown in FIG. As shown in the figure, various embodiments can be adopted, such as one in which the dispersion gutter 33 is provided so as to be movable left and right.

"Effects of the Invention" As explained above, according to the present invention, by repeatedly supplying the material to be treated onto the filter cloth to form multiple thin layers of the material to be treated, the material can be smoothly, uniformly and uniformly processed. It is possible to form a cake. Therefore, when a cleaning liquid is supplied to the cake formed in this shape, the cleaning liquid is evenly spread over the entire surface of the cake layer, making it easy to clean (and saving the cleaning liquid). Since the thickness is uniform, the filtrate and the passing air can be vacuum-sucked evenly, resulting in no waste and a high dehydration effect.

[Brief explanation of drawings]

FIG. 1 is a schematic configuration diagram of a horizontal vacuum filtration device showing an example of the present invention, FIG. 2 is a plan view of the same, FIG. Fig. 11 is for explaining the present invention in detail, Fig. 4 is an explanatory drawing showing the initial state, Fig. 5 is an explanatory drawing showing when the first slurry is formed in a single layer, and Fig. 6 is an explanatory drawing showing the formation of the first slurry in a single layer. Diagram of time, 7th
The figure is an explanatory diagram when one layer of the third slurry is formed, Figure 8 is an explanation when one layer of the first slurry is formed after the cake layer, and Figure 9 is an explanation when one layer of the first slurry is formed after the cake layer. Figure 10 is an explanatory diagram when a third layer is formed after the cake layer. Sentence 11 is an explanatory diagram when a single layer of first slurry is formed after two cake layers, Figures 12 to 15 show various actual forms of the slurry supply section, and Figure 12 is a universal diagram. An explanatory diagram of a slurry supply section using a joint of the structure, Fig. 13 is an explanatory diagram when a dispersion plate is used, Fig. 14 is an explanatory diagram when a dispersion gutter is provided rotatably, and Fig. 15 is an explanatory diagram when a dispersion gutter is provided rotatably. It is an explanatory view when a dispersion gutter is provided rotatably and freely movable left and right. 1...Filter cloth 2...Drive drum (drive device) 10...
・Cake forming section 11... Washing section 12... Dehydration section 13... Vacuum tray 17... Cylinder device 19... Slurry nozzle ( Slurry supply port) 2
Mountain 0... Flexible hose 21... Fixed pipe for slurry supply 22...
...Cleaning liquid nozzle 30...Nozzle end 31...Joint 32...Dispersion plate 33...Distribution gutter Sl, S2. S3 ・・・・・・Slurry layer Kl
*K2...Cake layer.

Claims (1)

[Claims] 1) A horizontal vacuum filtration method in which a material to be treated, such as a slurry, is supplied onto a filter cloth that moves in one direction intermittently, and a cake is formed by vacuum suction to perform dehydration and filtration. When supplying the material to be treated onto the filter cloth, the material to be treated is repeatedly supplied onto the filter cloth in the longitudinal direction, thereby forming a plurality of layers of the material to be treated on the filter cloth. A horizontal vacuum filtration method characterized by forming. 2) An endless filter cloth that is intermittently moved by a drive device is provided above the vacuum tray that is fixedly arranged, and a processing object for supplying the processing object above the endless filter cloth. A horizontal filter comprising a supply means and a cleaning liquid supply means for supplying the cleaning liquid, and a supply port of the object supply means is provided so as to be movable in the length direction of the endless filter cloth. vacuum filtration device. 3) A horizontal vacuum filtration device according to claim 2, characterized in that the fixedly arranged vacuum tray is divided into a cake forming section and a section such as a washing section or a dehydration section. .