Novel vacuum filter

Abstract

The utility model relates to the technical field of dry-wet separation, in particular to a novel vacuum filter which comprises a direct-current power supply, a slurry tank, a conductive filter plate and a polar plate corresponding to the conductive filter plate, two poles of the direct-current power supply are respectively connected with the conductive filter plate and the corresponding polar plate; at least one part of the polar plate is arranged in the slurry of the slurry pool; the projection of the polar plate in the direction perpendicular to the conductive filter plate is overlapped with the conductive filter plate; and an auxiliary dehydration electric field is formed between the conductive filter plate and the polar plate. An electric field can be formed between the conductive filter plate and the polar plate below the slurry liquid level, solid-liquid separation power is increased, production efficiency is improved, the water content is further reduced, meanwhile, microbubbles with certain abundance can be generated on the surface of the conductive filter plate under the action of the electric field, blockage of the filter plate is relieved, the cleaning frequency of the conductive filter plate is reduced, and the service life of the conductive filter plate is prolonged. And the bubbles can isolate the dehydrated filter material layer, so that subsequent stripping is more convenient to complete.

Description

Technical Field

[0001] The utility model relates to the technical field of dry-wet separation, in particular to a novel vacuum filter. Background Art

[0002] Most of the current filters use microporous ceramic materials as filter media, and use the principle of capillary action to allow water to pass through the filter material smoothly while air is difficult to pass through, thereby intercepting mineral particles to achieve solid-liquid separation. Of course, other media materials with evenly distributed micropores can also be used.

[0003] However, since the ore pulp always contains more or less particles close to the size of the micropores, the micropores on the filter medium will be blocked by these particles after the equipment has been running for a long time. General ceramic filters need to be cleaned once every 6 to 8 hours, and the later the cleaning is needed, the higher the water content of the slurry, and the worse the dehydration effect. The combined cleaning includes ultrasonic cleaning, acid cleaning, etc., which not only has a complicated process and affects production efficiency, but also produces a large amount of acidic wastewater, polluting the environment.

[0004] Therefore, how to ensure a high dehydration rate of the slurry while avoiding frequent clogging of the filter medium, requiring frequent cleaning, and reducing production efficiency is an urgent problem to be solved by technical personnel in this field. Utility Model Content

[0005] The utility model aims to provide a novel vacuum filter to solve the problems in the prior art of low slurry dehydration rate, frequent clogging of the filter medium, the need for frequent cleaning, reduced production efficiency and greater pollution.

[0006] In order to solve the above technical problems, the utility model provides a novel vacuum filter, comprising a DC power supply, a slurry pool, a conductive filter plate, and an electrode plate corresponding to the conductive filter plate;

[0007] The two poles of the DC power supply are respectively connected to the conductive filter plate and the corresponding pole plate;

[0008] At least a portion of the electrode plate is disposed in the slurry of the slurry pool;

[0009] The projection of the electrode plate in a direction perpendicular to the conductive filter plate overlaps with the conductive filter plate; an auxiliary dehydration electric field is formed between the conductive filter plate and the electrode plate.

[0010] Optionally, in the novel filter, the conductive filter plate is connected to the negative electrode of the DC power supply;

[0011] The electrode plate is connected to the positive electrode of the DC power supply.

[0012] Optionally, in the novel filter, the electrode plate is at least one of a graphite plate and a stainless steel composite plate.

[0013] Optionally, in the novel filter, the stainless steel composite plate includes a stainless steel substrate and a metal iridium coating covering the surface of the stainless steel substrate.

[0014] Optionally, in the novel filter, the conductive filter plate is parallel to the pole plate.

[0015] Optionally, in the novel filter, the electrode plates are completely covered by the slurry in the slurry pool.

[0016] Optionally, in the novel filter, the novel vacuum filter comprises a plurality of groups of the conductive filter plates and corresponding electrode plates.

[0017] Optionally, in the novel filter, the voltage gradient of the auxiliary dehydration electric field ranges from 2 V / cm to 4 V / cm, including endpoint values.

[0018] Optionally, in the novel filter, the conductive filter plate is a ceramic filter plate with a pre-embedded metal structure.

[0019] Optionally, in the novel filter, the metal structure is a metal fiber mesh or a metal electrode sheet.

[0020] The new vacuum filter provided by the utility model comprises a DC power supply, a slurry pool, a conductive filter plate, and an electrode plate corresponding to the conductive filter plate; the two poles of the DC power supply are respectively connected to the conductive filter plate and the corresponding electrode plate; at least a part of the electrode plate is arranged in the slurry of the slurry pool; the projection of the electrode plate in a direction perpendicular to the conductive filter plate overlaps with the conductive filter plate; an auxiliary dehydration electric field is formed between the conductive filter plate and the electrode plate. An electric field (i.e., an auxiliary dehydration electric field) is formed between the conductive filter plate in the utility model and the electrode plate under the slurry liquid level. Under the action of the electric field, the slurry increases the power of solid-liquid separation under the action of electrophoresis and electroosmosis, so that more fine particles actively approach the conductive filter plate, thereby improving production efficiency and further reducing the water content. At the same time, a certain abundance of microbubbles will be generated on the surface of the conductive filter plate under the action of the electric field, which has a mitigating effect on filter plate clogging and greatly increases the stable working time of the conductive filter plate between two cleanings. In other words, the number of cleaning times of the conductive filter plate is reduced, environmental pollution is reduced, and production costs are reduced. In addition, the bubbles will isolate the dehydrated filter material layer, making it more convenient to complete subsequent stripping. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the utility model or the technical solutions of the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0022] Figure 1 A structural schematic diagram of a specific implementation mode of the novel vacuum filter provided by the utility model;

[0023] Figure 2 The present invention is a schematic structural diagram of another specific implementation of the novel vacuum filter provided by the utility model.

[0024] In the figure, it includes 10-direct current power supply, 20-conductive filter plate, 30-electrode plate, and 40-slurry pool. DETAILED DESCRIPTION

[0025] In order to enable those skilled in the art to better understand the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present invention.

[0026] The core of the utility model is to provide a new type of vacuum filter, a structural schematic diagram of a specific implementation is shown as follows Figure 1 As shown, it is called the specific implementation mode 1, which includes a DC power supply 10, a slurry pool 40, a conductive filter plate 20, and an electrode plate 30 corresponding to the conductive filter plate 20;

[0027] The two poles of the DC power source 10 are respectively connected to the conductive filter plate 20 and the corresponding pole plate 30;

[0028] At least a portion of the electrode plate 30 is disposed in the slurry of the slurry pool 40;

[0029] The projection of the electrode plate 30 in a direction perpendicular to the conductive filter plate 20 overlaps with the conductive filter plate 20 ; an auxiliary dehydration electric field is formed between the conductive filter plate 20 and the electrode plate 30 .

[0030] The DC power supply 10 is preferably a DC regulated power supply.

[0031] Preferably, the conductive filter plate 20 is connected to the negative electrode of the DC power source 10;

[0032] The electrode plate 30 is connected to the positive electrode of the DC power source 10 .

[0033] In other words, in this preferred embodiment, the conductive filter plate 20 is a cathode, and the electrode plate 30 is an anode. Setting the conductive filter plate 20 as a cathode can greatly reduce the material cost of the conductive filter plate 20, thereby reducing the overall production cost of the equipment.

[0034] The conductive filter plate 20 completes the filtering and material stripping operation once per rotation. First, the filter plate is immersed in the slurry in the slurry pool. Under the vacuum filtration, the water in the slurry is extracted through the conductive filter plate 20, and the material is retained on the surface of the conductive filter plate 20. As the conductive filter plate 20 disc rotates away from the slurry level, the separation of water is continued, so that the moisture content of the retained material is further reduced. When the conductive filter plate 20 is turned to the scraper position, the retained material on the surface is stripped. The conductive filter plate 20 can be connected to the negative pole of the DC power supply 10 through the equipment housing.

[0035] Furthermore, the electrode plate 30 is at least one of a graphite plate and a stainless steel composite plate. Of course, this preferred embodiment is a preferred embodiment based on the electrode plate 30 being an anode. The graphite plate and the stainless steel composite plate have very good chemical stability and can be immersed in the slurry without being corroded, which greatly improves the working stability of the equipment and extends the service life. Of course, other electrode plates 30 can also be selected according to actual conditions, and the utility model is not limited here. Further, the stainless steel composite plate includes a stainless steel substrate and a metal iridium coating covering the surface of the stainless steel substrate. Metal iridium has strong plasticity, corrosion resistance, and good electrical conductivity. Combined with a stainless steel substrate, it can achieve high corrosion resistance and electrical conductivity while maintaining a low cost.

[0036] Preferably, the conductive filter plate 20 is parallel to the electrode plate 30. The conductive filter plate 20 is arranged in parallel with the electrode plate 30, which not only saves space inside the equipment and facilitates the internal design of subsequent equipment, but also maximizes the projection area of ​​the two plates on each other's surface, and can also achieve a stronger auxiliary dehydration electric field strength with the minimum plate cost.

[0037] In addition, the electrode plate 30 is completely covered by the slurry in the slurry pool 40. Since the auxiliary dehydration electric field can drive electrophoresis and electroosmosis in the slurry only inside the slurry, placing the electrode plate 30 completely under the slurry can avoid the failure of the electric field. In other words, it avoids useless parts in the system and reduces costs.

[0038] In addition, the novel vacuum filter comprises a plurality of sets of the conductive filter plates 20 and corresponding electrode plates 30. Figure 2 ,exist Figure 2In the same slurry pool 40, there are multiple sets of conductive filter plates 20 and corresponding electrode plates 30, which greatly improves the space utilization of the equipment, is more suitable for mass production, and greatly improves the production efficiency of the dehydrated material.

[0039] Wherein, the voltage gradient of the auxiliary dehydration electric field ranges from 2V / cm (volts / centimeter) to 4V / cm, including endpoint values, such as any one of 2.0V / cm, 3.1V / cm or 4.0V / cm. The above range is the preferred parameter range after a large number of calculations and actual tests. Within the above range, it can achieve a better effect of driving solid-liquid separation without causing energy waste. To give a specific example, within the above range, the corresponding device of the utility model can be used to treat phosphate concentrate slurry. In the absence of an electric field, the water content of the slurry is reduced from 60% to 16%. After applying an electric field, the water content can be reduced to 13%.

[0040] As a preferred embodiment, the conductive filter plate 20 is a ceramic filter plate with a pre-embedded metal structure. The ceramic structure has many small holes with apertures shown, which is naturally suitable as a filter plate. In this preferred embodiment, a metal structure is added to the ceramic filter plate, which greatly improves the conductivity of the filter plate and enhances the auxiliary dehydration electric field. While achieving better filtration, it also facilitates the formation of the electric field.

[0041] Furthermore, the metal structure is a metal fiber mesh or a metal electrode sheet. The metal fiber mesh has a large laying area and a more flexible shape, which can better improve the field strength and coverage area of ​​the auxiliary dehydration electric field, while the metal electrode sheet is simple to manufacture and low in cost, and can be selected according to actual conditions.

[0042] The new vacuum filter provided by the utility model includes a DC power supply 10, a slurry pool 40, a conductive filter plate 20, and an electrode plate 30 corresponding to the conductive filter plate 20; the two poles of the DC power supply 10 are respectively connected to the conductive filter plate 20 and the corresponding electrode plate 30; at least a part of the electrode plate 30 is arranged in the slurry of the slurry pool 40; the projection of the electrode plate 30 in a direction perpendicular to the conductive filter plate 20 overlaps with the conductive filter plate 20; an auxiliary dehydration electric field is formed between the conductive filter plate 20 and the electrode plate 30. An electric field (i.e., an auxiliary dehydration electric field) is formed between the conductive filter plate 20 in the utility model and the electrode plate 30 under the slurry liquid level. Under the action of the electric field, the slurry increases the power of solid-liquid separation under the action of electrophoresis and electroosmosis, so that more fine particles actively approach the conductive filter plate 20, thereby improving production efficiency and further reducing the water content. At the same time, a certain abundance of microbubbles will be generated on the surface of the conductive filter plate 20 under the action of the electric field, which has a mitigating effect on filter plate clogging and greatly increases the stable working time of the conductive filter plate 20 between two cleanings. In other words, the number of cleaning times of the conductive filter plate 20 is reduced, environmental pollution is reduced, and production costs are reduced. In addition, the bubbles will isolate the dehydrated filter material layer, making it more convenient to complete subsequent stripping.

[0043] In this specification, each embodiment is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the embodiments can be referred to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the method part.

[0044] It should be noted that, in this specification, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "comprise", "include" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the statement "comprises a ..." does not exclude the presence of other identical elements in the process, method, article or device including the element.

[0045] The novel vacuum filter provided by the utility model is introduced in detail above. The principle and implementation method of the utility model are described in this article using specific examples. The description of the above embodiments is only used to help understand the method and core idea of ​​the utility model. It should be pointed out that for ordinary technicians in this technical field, the utility model can also be improved and modified without departing from the principle of the utility model, and these improvements and modifications also fall within the scope of protection of the claims of the utility model.

Claims

1. A new type of vacuum filter, characterized in that: It includes a direct current power supply, a slurry pool, a conductive filter plate, and a plate corresponding to the conductive filter plate; The two poles of the DC power supply are respectively connected to the conductive filter plate and the corresponding pole plate; At least a portion of the electrode plate is disposed in the slurry of the slurry pool; The projection of the electrode plate in a direction perpendicular to the conductive filter plate overlaps with the conductive filter plate; an auxiliary dehydration electric field is formed between the conductive filter plate and the electrode plate.

2. The novel vacuum filter according to claim 1, characterized in that: The conductive filter plate is connected to the negative electrode of the DC power supply; The electrode plate is connected to the positive electrode of the DC power supply.

3. The novel vacuum filter as claimed in claim 2, characterized in that: The electrode plate is at least one of a graphite plate and a stainless steel composite plate.

4. The novel vacuum filter as claimed in claim 3, characterized in that: The stainless steel composite plate comprises a stainless steel substrate and a metal iridium coating covering the surface of the stainless steel substrate.

5. The novel vacuum filter according to claim 1, characterized in that: The conductive filter plate is parallel to the electrode plate.

6. The novel vacuum filter according to claim 1, characterized in that: The electrode plate is completely covered by the slurry in the slurry pool.

7. The novel vacuum filter as claimed in claim 1, characterized in that: The novel vacuum filter comprises a plurality of groups of the conductive filter plates and corresponding electrode plates.

8. The novel vacuum filter as claimed in claim 1, characterized in that: The voltage gradient of the auxiliary dehydration electric field ranges from 2 V / cm to 4 V / cm, including endpoint values.

9. The novel vacuum filter according to any one of claims 1 to 8, characterized in that: The conductive filter plate is a ceramic filter plate with a pre-embedded metal structure.

10. The novel vacuum filter according to claim 9, characterized in that: The metal structure is a metal fiber mesh or a metal electrode sheet.

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