JP2757101B2 - Filtration dehydration method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for filtering and dehydrating a filter.

[0002]

2. Description of the Related Art Conventionally, it has been known that dewatering is performed by supplying compressed air to a filtration chamber. However, when filtration proceeds and the cake is solidified to some extent, a communication hole for air is formed, and compressed air is directly discharged from the filtration section. There was a problem that it could come off and no more dehydration was possible. Although it depends on the raw material, in the case of the stone raw material, the filter cake had a water content of about 26%.

[0003]

SUMMARY OF THE INVENTION Accordingly, the present invention provides a method for obtaining a filter cake having a low water content by eliminating the air communication holes by a simple method, whereby the filtration and dehydration can be further continued.

[0004]

SUMMARY OF THE INVENTION Accordingly, the present invention provides a vibrator which supplies compressed air from above a closed filtration chamber, drains filtered water from a filtration section at the bottom, and solidifies filter cake. By vibrating the filter cake and bringing the particles of the filter cake into close contact with each other to narrow the particle gap and push up water to the upper surface of the filter cake, and then stop the vibration, then supply compressed air from above into the closed filtration chamber again. The water that has been pushed up to the upper surface of the filter cake is filtered from the filter section at the bottom.

[0005]

The filtration chamber is closed and compressed air is supplied from above to filter the housed mud through the bottom filtration section, drain the filtered water, and solidify the cake in the filtration chamber. Then, the primary dewatered filter cake is vibrated by vibrating the filtration chamber or the filtration unit with a vibrator, thereby closing the particles of the filter cake and closing the air communication hole generated. That is, since the lump of cake is broken and flows by the vibration, the gap between the particles of the cake is narrowed, and the water that has entered the gap is pushed up to the upper surface of the cake.

After stopping the vibration, compressed air is again supplied from above into the closed filtration chamber, whereby the water pushed up to the upper surface of the filter cake is subjected to secondary dehydration filtration from the filtration section at the bottom. By this vibration and re-filtration of the compressed air, the water pushed up on the upper surface of the cake can be dewatered.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, illustrated embodiments of the present invention will be described. In the apparatus of the present embodiment shown in FIG. 1, reference numeral 1 denotes a filter tube having an upper end enlarged and opened, and a filter cloth 2 and a perforated drain plate 3 are fixed to the bottom of the opening to form a filter section, and a perforated filter is formed. A vibrating plate 4 having a large number of drain holes is disposed below the draining plate 3.

Reference numeral 5 denotes a lid, on which a rubber thin piece 51 for sealing is attached on the lower surface. The lid 5 can be moved up and down by a cylinder. A supply hose 6 for compressed air is connected near the center of the lid 5 to open the lower surface. Also,
The vibrating plate 4 is connected to the vibrator 7 and vibrates.

The operation of the present embodiment will be described. The lid 5 is attached to the filter cylinder 2 containing the slurry, the filter chamber is sealed, and the compressor is driven to supply compressed air from the supply hose 6 from above. By this, the slurry is subjected to primary dehydration filtration at the bottom filtration section,
As shown in FIG. 2, the filtered water is drained from the filter cloth 2 and the perforated drain plate 3 through the drain hole of the vibrating plate 4.

As a result, as shown in FIG. 3, the primary dehydrated filter cake 8 is solidified in the filtration chamber and adheres to the inner surface of the filter tube 1 and the filter cloth 2. In this state, a large number of air communication holes 81 are formed in the filter cake 8, and even if compressed air is supplied, the air escapes from the communication holes 81, resulting in a pressure loss and no filtering action. Therefore, the conventional filtration using the compressed air has been described above. In addition, many communication holes 81 are formed from large visible cracks to small invisible small holes.

Then, the vibrator 7 is driven to vibrate the vibrating plate 4 to vibrate the filtration unit. As a result, the filter cake 8 is vibrated to bring the particles of the filter cake 8 into close contact, and the air communication hole 81 is closed. That is, since the mass of the filter cake 8 collapses and flows due to the vibration, the gap between the particles of the filter cake is narrowed, and the water 82 that has entered the gap is pushed out to the upper surface of the filter cake 8 as shown in FIG. .

Then, after the vibration exciter 7 is stopped and the vibration of the filtration unit by the vibrating plate 4 is stopped, the compressor is driven to supply compressed air from the supply hose 6 into the closed filtration chamber again from above. Thereby, as shown in FIG.
Is pressurized and the water 81 pushed up to the upper surface is subjected to secondary dehydration filtration from the filtration section at the bottom. That is, since the communication hole 81 of the filter cake 8 has disappeared due to the vibration, the compressed air can uniformly squeeze the filter cake 8.

According to this embodiment, the water 81 pushed up to the upper surface of the filter cake 8 by the vibration can be dewatered by the vibration of the filter cake 8 subjected to the primary dehydration and the re-filtration by the compressed air. According to the experiment, the water content is 26%. Was changed to a filter cake having a water content of 24%. This 2% reduction effect is extremely large, and the solidification hardness differs greatly. Experiments with other raw materials also showed a dehydration effect of about several percent.

Although the present embodiment is configured as described above, the present invention is not limited to this. For example, the means for forming the filtration chamber and the means for sealing the filtration chamber are not limited. Further, the configuration of the bottom filtration unit is not limited. Further, a means for vibrating the filter cake is optional.

[0015]

According to the present invention, by vibrating the primary dewatered filter cake, the filter cake flows and collapses, and the gap between the particles of the filter cake is narrowed. By supplying compressed air from above into the filtration chamber, which is pushed up to the top and closed again, the water pushed up to the top of the filter cake is filtered from the filtration section at the bottom, and strong filtration and dehydration can be achieved.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional front view showing a vibration state according to an embodiment of the present invention.

FIG. 2 is a longitudinal sectional front view of the primary dewatering filtration state.

FIG. 3 is a vertical cross-sectional front view after completion of primary dehydration filtration.

FIG. 4 is a vertical sectional front view in a state of secondary dehydration filtration.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Filtration cylinder 2 Filter cloth 3 Perforated draining plate 4 Vibrating plate 5 Lid 51 Rubber flake 6 Supply hose 7 Shaker

Claims (1)

(57) [Claims] 1. Compressed air is supplied from above a sealed filtration chamber, filtered water is drained from a filtration section at the bottom to solidify the filter cake, and the filter cake is vibrated by a vibrator to shake the filter cake particles. , The water is pushed up to the upper surface of the filter cake by narrowing the particle gap, and then the vibration is stopped.After that, compressed air is supplied from above into the closed filter room again to remove the water pushed up to the upper surface of the filter cake. A filtration and dehydration method, wherein the filtration is performed through a filtration section at the bottom.