A segmental dewatering disc filter

Abstract

The utility model relates to a kind of segmented dehydration type disc filter, its structure includes equipment shell, filter disc and unloading cake port, filter disc is installed in shell, and the filter disc both sides of one side in shell are equipped with unloading cake port, slurry is loaded in shell, and the circular area of filter disc rotation is divided into unloading cake area, high negative pressure dehydration area, middle negative pressure dehydration area and filter cake formation area in turn from the upper direction of unloading cake port to the opposite direction circular of filter disc rotation, the inside of filter disc part that rotates to unloading cake area is normal pressure, the inside of filter disc part that rotates to filter cake formation area, middle negative pressure dehydration area and high negative pressure dehydration area is negative pressure in turn increasing, slurry covers filter cake formation area.The utility model has the advantages of: structure design is reasonable, filter disc negative pressure area is divided into three negative pressure increasing areas, so that when filter cake is preliminarily adsorbed on filter disc, particle is loose, and subsequent dehydration of filter cake is facilitated, then two times of dehydration are carried out through two negative pressure increasing areas, and filter cake moisture content can be effectively reduced.

Description

Technical Field

[0001] This utility model relates to a disc filter, specifically a segmented dewatering disc filter. Background Technology

[0002] Disc filters are devices that use vacuum as the filtration power to separate solids and liquids in slurries. They are suitable for filtering and dewatering fine particulate materials in industries such as mining (metallic and non-metallic minerals), environmental sludge, cement, and building materials.

[0003] Existing disc filters typically divide the filter discs into a negative pressure zone and a normal pressure zone along their circumference. The negative pressure zone dewaters the slurry on the surface of the filter disc, while the normal pressure zone discharges the filter cake to the discharge port. This structure suffers from a problem: the high negative pressure in the negative pressure zone causes the filter cake particles to be tightly packed, making it difficult to separate water molecules and resulting in a high moisture content in the filter cake. Utility Model Content

[0004] This utility model proposes a segmented dewatering disc filter, which aims to overcome the above-mentioned shortcomings of the existing technology by dividing the negative pressure zone into areas with different pressures to reduce the moisture content of the filter cake.

[0005] The technical solution of this utility model is a segmented dewatering disc filter, the structure of which includes a housing, a filter disc, and a cake discharge port. The filter disc is installed inside the housing, and cake discharge ports are provided on both sides of the filter disc on one side of the housing. The housing is filled with slurry. The circular area where the filter disc rotates is divided into a cake discharge zone, a high negative pressure dewatering zone, a medium negative pressure dewatering zone, and a cake forming zone in the circumferential direction from the cake discharge port in the opposite direction of the filter disc rotation. The filter disc part in the cake discharge zone is under normal pressure. The negative pressure inside the filter disc parts in the cake forming zone, medium negative pressure dewatering zone, and high negative pressure dewatering zone increases sequentially. The slurry covers the cake forming zone. The cake forming zone has a low negative pressure, and the slurry adheres to the filter disc in this area, forming a loose filter cake particle. Then it rotates to the medium negative pressure dewatering zone for a first dewatering, and then rotates to the high negative pressure dewatering zone for a second dewatering. The loose filter cake particles are easy to dewater. After two dewatering processes, water molecules between the filter cake particles can be effectively separated, reducing the moisture content of the final product.

[0006] Preferably, with the center of the filter disc as the center, the cake discharge area is located at a 35° angle to the line connecting the center and the outer edge of the cake discharge port in the opposite direction of rotation of the filter disc; the high negative pressure dehydration area is located at a 70° angle to the edge of the cake discharge area in the opposite direction of rotation of the filter disc; the medium negative pressure dehydration area is located at a 100° angle to the edge of the high negative pressure dehydration area in the opposite direction of rotation of the filter disc; and the remaining part is the filter cake forming area.

[0007] The advantages of this utility model are: the structure is reasonably designed, dividing the negative pressure zone of the filter disc into three areas with increasing negative pressure, so that the particles are loose when the filter cake is initially adsorbed on the filter disc, which facilitates the subsequent dewatering of the filter cake. Then, it undergoes two dewatering processes through two areas with increasing negative pressure, which can effectively reduce the moisture content of the filter cake. Attached Figure Description

[0008] Figure 1 This is a schematic diagram of the structure of the segmented dewatering disc filter of this utility model.

[0009] In the diagram, 1 is the equipment housing, 2 is the filter disc, 21 is the cake discharge area, 22 is the high negative pressure dewatering area, 23 is the medium negative pressure dewatering area, 24 is the filter cake forming area, 3 is the cake discharge port, and 4 is the slurry. Detailed Implementation

[0010] The present invention will be further described in detail below with reference to embodiments and specific implementation methods.

[0011] like Figure 1 As shown, a segmented dewatering disc filter includes a housing 1, a filter disc 2, and a cake discharge port 3. The filter disc 2 is installed inside the housing 1. The filter disc 2 has cake discharge ports 3 on both sides on one side of the housing 1. The housing 1 is filled with slurry 4. The circular area where the filter disc 2 rotates is divided into a cake discharge zone 21, a high negative pressure dewatering zone 22, a medium negative pressure dewatering zone 23, and a cake forming zone 24 in the circumferential direction from the cake discharge port 3 in the opposite direction of the rotation of the filter disc 2. The filter disc 2 in the cake discharge zone 21 is under normal pressure. The negative pressure inside the filter disc 2 in the cake forming zone 24, the medium negative pressure dewatering zone 23, and the high negative pressure dewatering zone 22 increases sequentially. The slurry 4 covers the cake forming zone 24.

[0012] Based on the above structure, the filter cake forming zone 24 has a low negative pressure. The slurry 4 adheres to the filter disc 2 in this zone, and the filter cake particles are loose. Then, it is rotated to the medium negative pressure dewatering zone 23 for a first dewatering, and then rotated to the high negative pressure dewatering zone 22 for a second dewatering. The loose filter cake particles are easy to dewater. After two dewatering processes, water molecules between the filter cake particles can be effectively separated, thereby reducing the moisture content of the final product.

[0013] As one embodiment, with the center of the filter disc 2 as the center, the cake discharge area 21 is located at a 35° angle to the line connecting the center and the outer edge of the cake discharge port 3 in the opposite direction of rotation towards the filter disc 2. The high negative pressure dehydration area 22 is located at a 70° angle to the edge of the cake discharge area 21 in the opposite direction of rotation towards the filter disc 2. The medium negative pressure dehydration area 23 is located at a 100° angle to the edge of the high negative pressure dehydration area 22 in the opposite direction of rotation towards the filter disc 2. The remaining part is the filter cake forming area 24.

[0014] As a further embodiment, the negative pressure in the high negative pressure dehydration zone 22 should be higher than -0.075 MPa.

[0015] All of the components described above are existing technologies, and those skilled in the art can use any model and existing design that can achieve their corresponding functions.

[0016] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several modifications and improvements can be made without departing from the inventive concept of the present utility model, and these all fall within the protection scope of the present utility model.

Claims

1. A segmented dewatering disc filter, characterized in that, The equipment includes a housing (1), a filter disc (2), and a cake discharge port (3). The filter disc (2) is installed inside the housing (1). The filter disc (2) on one side of the housing (1) is provided with cake discharge ports (3) on both sides. The housing (1) is filled with slurry (4). The circular area of ​​the filter disc (2) is divided into a cake discharge zone (21), a high negative pressure dewatering zone (22), a medium negative pressure dewatering zone (23), and a cake forming zone (24) in the circumferential direction from the top of the cake discharge port (3) to the opposite direction of the rotation of the filter disc (2). The filter disc (2) in the cake discharge zone (21) is under normal pressure. The filter disc (2) in the cake forming zone (24), the medium negative pressure dewatering zone (23), and the high negative pressure dewatering zone (22) are under increasing negative pressure. The slurry (4) covers the cake forming zone (24).

2. The segmented dewatering disc filter as described in claim 1, characterized in that, With the center of the filter disc (2) as the center, the cake discharge area (21) is located at a 35° angle to the line connecting the center and the outer edge of the cake discharge port (3) in the opposite direction of the filter disc (2). The high negative pressure dehydration area (22) is located at a 70° angle to the edge of the cake discharge area (21) in the opposite direction of the filter disc (2). The medium negative pressure dehydration area (23) is located at a 100° angle to the edge of the high negative pressure dehydration area (22) in the opposite direction of the filter disc (2). The remaining part is the filter cake forming area (24).

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