Micropore filtration and concentration equipment and method thereof

Abstract

The invention relates to the technical field of slurry concentration, in particular to microporous filtration and concentration equipment and a method thereof.The microporous filtration and concentration equipment comprises a tank body, a filter assembly and a clear water discharging pipeline valve bank, the tank body is provided with a liquid inlet pipeline valve bank, a feeding pipeline valve bank and a gas inlet pipeline valve bank, and the filter assembly comprises multiple layers of first filter materials; the multiple layers of first filter materials are horizontally arranged in the tank body at intervals up and down, the clearing pipeline valve group comprises multiple groups of clearing valves, the multiple groups of clearing valves are respectively communicated with each layer of first filter material of the filter assembly, and a flow meter is arranged on a downstream confluence pipeline of the clearing pipeline valve group and is used for detecting the flow of clear liquid; the filter components in the tank body are horizontally arranged at intervals up and down, so that the longitudinal linkage relationship and the transverse linkage relationship among the filter materials are broken, and each filter material is independently controlled; the problems of low filtering efficiency and poor filtering effect caused by simultaneous stopping of filtering of the multi-layer filtering materials of the layer due to closing of the corresponding layer of filtering materials after the filtering materials are exposed out of the liquid level are solved.

Description

Technical Field

[0001] The present invention relates to the technical field of slurry concentration, in particular to a microporous filtration and concentration device and a method thereof. Background Art

[0002] In the production of new lithium battery materials, hydrometallurgy, food, biopharmaceuticals, cosmetics, and chemicals, solid-containing liquids often need to be filtered and concentrated to increase their solids content. Existing microporous concentration filters typically employ a multi-layered, vertically arranged ring of filter elements surrounding a stirring paddle. These layers are arranged in a high-height pattern. This layout allows for multiple filter elements to be arranged in both radial and axial directions to increase the filtration area.

[0003] However, with this annular vertical arrangement, the top filter element is susceptible to exposure to the liquid surface during agitation and fluctuations in the concentrate level. This exposure can cause gas to rapidly escape, reducing the concentration and filtration efficiency and increasing gas consumption. While disabling the filter element purge in the corresponding layer can reduce gas escape, it also prevents the purge from occurring in the multiple filter layers in that layer, reducing the filtration area and impacting filtration effectiveness and efficiency.

[0004] It should be noted that the information disclosed in this background technology section is only intended to increase understanding of the overall background of the present invention, and should not be regarded as an admission or any form of implication that the information constitutes prior art already known to those skilled in the art. Summary of the Invention

[0005] In order to solve the technical problem of low effective utilization rate of filter elements in the above-mentioned existing filtration and concentration equipment, the present invention provides a microporous filtration and concentration equipment, which includes a tank body, a filter assembly and a clear pipeline valve group. The tank body is provided with a liquid inlet pipeline valve group, a feed pipeline valve group and an air inlet pipeline valve group. The filter assembly includes multiple layers of first filter materials, which are horizontally arranged in the tank body with upper and lower intervals. The clear pipeline valve group includes multiple groups of clear valves, and the multiple groups of clear valves are respectively connected to each layer of the first filter material of the filter assembly. A flow meter is provided downstream of the clear pipeline valve group for detecting the flow rate of the clear liquid in the clear pipeline valve group.

[0006] Furthermore, the first filter materials at different levels have different specifications and sizes.

[0007] Furthermore, the size of the first filter material at the lower layer is larger than the size of the first filter material at the higher layer.

[0008] Furthermore, the filtration diameter of the first filter material is 0.1 μm to 100 μm.

[0009] Furthermore, the microporous filtration and concentration equipment further includes a liquid level gauge and a pressure gauge, and the liquid level gauge and the pressure gauge are respectively arranged on the tank body.

[0010] Furthermore, the microporous filtration and concentration equipment also includes a stirring device, and the stirring device extends into the tank body.

[0011] Furthermore, the microporous filtration and concentration equipment also includes a backflush pipeline valve group, one end of which is connected to the air intake pipeline valve group, and the other end of which is respectively connected to each layer of the first filter material.

[0012] Furthermore, the back-flushing pipeline valve group includes multiple groups of back-flushing valves, and the multiple groups of back-flushing valves are respectively arranged between each group of the clearing valves and each layer of the first filter material.

[0013] Furthermore, the filter assembly further comprises a multi-level second filter material, the multi-level second filter material is located below the first filter material, and the multi-level second filter material is spaced from the inside to the outside and arranged vertically; The second filter material at each level is respectively connected to a plurality of groups of the clearing valves, and the second filter material at each level is respectively connected to the backwash pipeline valve group.

[0014] Furthermore, the present invention also provides a filtration and concentration method, which uses any one of the microporous filtration and concentration devices described above to perform filtration and concentration.

[0015] Based on the above, the present invention provides a microporous filtration and concentration device and method thereof. Compared with the prior art, the filter components inside the tank body are arranged horizontally with upper and lower spacing, breaking the vertical linkage relationship and horizontal linkage relationship between the filter materials, realizing independent control of each filter material, and avoiding the problem that the multi-level filter materials of the layer stop filtering at the same time due to the closure of the clearing of the corresponding layer of filter material after the filter material is exposed to the liquid surface, resulting in a large reduction in the proportion of filter elements effectively used for filtration, resulting in low filtration efficiency and poor filtration effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] To more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be derived from these drawings without inventive effort. The positional relationships described in the drawings in the following description are based on the orientation of the components in the drawings unless otherwise specified.

[0017] Figure 1 It is a schematic diagram of the cross-sectional structure of a filtration and concentration device in the prior art; Figure 2 A schematic structural diagram of a microporous filtration and concentration device provided in one embodiment of the present invention; Figure 3 A schematic structural diagram of a microporous filtration and concentration device provided in the second embodiment of the present invention.

[0018] Reference numerals: DETAILED DESCRIPTION

[0019] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0020] In the description of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance, or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more. In addition, the term "including" and any variations thereof all mean "at least including".

[0021] First, in order to fully understand the technical solution of this application, the existing filtration and concentration equipment is analyzed. Figure 1 As shown, the existing solution uses filter elements to be arranged vertically in multiple levels around the stirring paddle from the inside to the outside in a circle. At the same time, in order to increase the filtration area, at least two layers of filter elements (usually two layers) are set in the longitudinal direction.

[0022] However, during the actual implementation process, as the slurry is stirred or filtered, the liquid level fluctuates and rises, and the top filter element is easily exposed to the liquid surface, causing the gas to escape quickly. To prevent gas escape, the existing solution can only close the outlet of the filter element in this layer. However, this results in the simultaneous closure of the inner and outer multi-layer filter elements in this layer, greatly reducing the filtration area and resulting in poor filtration efficiency and effect.

[0023] In order to solve the technical problem of low effective utilization rate of filter elements in the above-mentioned existing filtration and concentration equipment, or to achieve at least one of the above advantages or other advantages, an embodiment of the present invention provides a microporous filtration and concentration equipment. Figure 2 As shown in FIG, the microporous filtration and concentration device includes a tank body 10, a filter assembly 20 and a clearing pipeline valve group 30.

[0024] Tank 10 may be equipped with a liquid inlet valve assembly 40, a material inlet valve assembly 50, and an air inlet valve assembly 60, respectively used to introduce water, slurry, and a given air pressure. During the filtration process, the microporous filtration and concentration equipment continuously ingests and discharges liquid, and the slurry level within tank 10 changes in real time. Therefore, tank 10 may be equipped with a liquid level gauge 70 for real-time monitoring of the slurry level within tank 10. Based on the detection results of liquid level gauge 70, step-by-step control of the corresponding layer's discharge circuit is implemented to prevent gas escape.

[0025] Preferably, there may be multiple groups of liquid inlet pipeline valve groups 40, each used to introduce different liquids such as water and cleaning acid, all of which are within the scope of protection of this application.

[0026] Furthermore, the tank body 10 may be provided with a stirring device 80. The stirring device 80 is driven by a motor and extends into the tank body 10. The stirring device 80 can drive the slurry to flow, thereby maintaining sufficient mixing of particles throughout the flow field within the tank body 10 and preventing sedimentation. Preferably, the stirring portion 81 of the stirring device 80 can be located in the middle of the tank body 10 to uniformly maintain the overall flow field.

[0027] In some preferred embodiments, a pressure gauge 90 may be provided on the tank body 10 for monitoring the pressure inside the tank body 10 in real time.

[0028] The filter assembly 20 includes multiple layers of first filter material 21. The multiple layers of first filter material 21 are arranged horizontally and spaced apart in an upper and lower direction within the tank 10. The clearing line valve assembly 30 includes multiple sets of clearing valves 31. The multiple sets of clearing valves 31 are respectively connected to each layer of first filter material 21 of the filter assembly 20.

[0029] The first filter material 21 can be a sintered microporous filter material made of organic, inorganic or metal materials, etc., which is not limited in this case. Preferably, the filtration diameter of the first filter material 21 is 0.1 μm to 100 μm.

[0030] In some preferred embodiments, the first filter material 21 can be a single filter material in the form of a rod, plate, or other suitable shape, or a filter material assembly formed by combining multiple single filter materials. Preferably, the specifications and sizes of the first filter materials 21 in different layers can be different. Specifically, the specifications and sizes of the first filter material 21 in the lower layer are larger than the specifications and sizes of the first filter material 21 in the upper layer to improve utilization and filtration efficiency. Of course, the specifications and sizes of the first filter material 21 can be adjusted according to actual needs.

[0031] In a specific implementation, the filter assembly 20 comprises four layers of first filter material 21A, 21B, 21C, and 21D. The first filter materials 21A, 21B, 21C, and 21D are spaced apart from each other and arranged horizontally. The cleanout line valve assembly 30 comprises four sets of cleanout valves 31A, 31B, 31C, and 31D. Cleanout valve 31A connects to the first filter material 21A. Cleanout valve 31B connects to the first filter material 21B. Cleanout valve 31C connects to the first filter material 21C. Cleanout valve 31D connects to the first filter material 21D.

[0032] According to the liquid level of the slurry in the tank body 10, the clearing valve 31 corresponding to the first filter material 21 exposed to the liquid surface is closed, and the other first filter materials 21 not exposed to the liquid surface are not affected and continue to clear. The horizontally arranged first filter material 21 is used to achieve step-by-step control of each layer of the first filter material 21, while interrupting the longitudinal linkage relationship between the first filter materials 21 of each layer, and there is no radial linkage relationship between the first filter materials 21 of each level, so as to avoid the problem of suspending filtration of multiple levels of first filter materials 21 of the layer at the same time due to the closure of the clearing valve 31 of a single layer, thereby avoiding the problem of a significant reduction in the filtration area.

[0033] Of course, the specific number of layers of the first filter material 21 and the specific number of groups of the clearing valves 31 can be adjusted according to actual needs and are not limited thereto. This embodiment is only described by taking four layers of the first filter material 21 and four groups of the clearing valves 31 as an example.

[0034] Based on the above, a flow meter 100 is installed in the downstream confluence line of the clean-out valve assembly 30. Flow meter 100 is used to detect the real-time flow rate in the confluence line downstream of the clean-out valve assembly 30. The confluence line downstream of the clean-out valve assembly 30 contains filtered clear liquid and may also contain gas that escapes after the first filter material 21 emerges from the liquid surface. When the first filter material 21 is below the slurry liquid surface, the flow downstream of the clean-out valve assembly 30 is primarily filtered clear liquid, and the flow rate data shows fluctuations as the liquid flows.

[0035] If the first filter material 21 is exposed to the liquid surface, gas will escape into the downstream pipeline of the purge pipeline valve group 30, and the flow data will show an instantaneous jump. In combination with the detection data of the liquid level meter 70, control will be implemented to close the purge valve 31 of the corresponding layer, close the purge circuit, and prevent gas from escaping.

[0036] Specifically, the filtration and concentration process of the microporous filtration and concentration equipment is a cyclic layered clearing: the slurry level in the tank body 10 is at a high level, and multiple groups of clearing valves 31 are fully open for filtration and clearing; with the stirring action of the stirring device 80 or the continuous filtration and clearing, the slurry level fluctuates and drops, and the liquid level meter 70 detects the slurry level in the tank body 10 in real time, and monitors the flow data through the flow meter 100. If the flow data jumps instantaneously, it means that the first filter material 21 near the corresponding liquid level is exposed to the liquid surface and the filtration fails. The clearing valve 31 corresponding to the first filter material 21 is immediately closed to reduce gas escape and continue concentration and filtration; as the clearing circuit is closed one after another, the clearing efficiency decreases, and the liquid level begins to rise from a low level to a high level. The liquid level is detected in real time and the corresponding clearing valve 31 is opened for filtration and clearing, and this cycle is repeated.

[0037] In some preferred embodiments, the microfiltration and concentration apparatus further includes a backflush valve assembly 110. One end of the backflush valve assembly 110 is connected to the intake valve assembly 60, and the other end of the backflush valve assembly 110 is connected to each layer of first filter material 21. A pressure relief valve 120 is provided on the tank body 10. In a specific embodiment, the backflush valve assembly 110 includes multiple sets of backflush valves 111, each of which is disposed between each set of clear valves 31 and each layer of first filter material 21.

[0038] As the filtration and clearing process continues, the solids in the slurry adhere to the surface of the first filter material 21, resulting in a decrease in the flow rate of the filtered clear liquid, which leads to a decrease in the filtration efficiency. At this time, the back-blowing pipeline valve group 110 can be started to perform the cleaning process. The time for different layers of the first filter material 21 to contact the slurry and the time for filtration and clearing are different. The different clearing circuits can be staggered for cleaning through liquid level detection, clearing flow and control frequency data of the clearing valve 31. Under the premise of continuous filtration and clearing, the filtration status of each layer of the first filter material 21 is guaranteed, which is beneficial to the filtration efficiency and filtration effect.

[0039] Of course, the specific number of backflush valves 111 can be adjusted according to the actual number of layers of the first filter material 21 and is not limited thereto.

[0040] In a variant embodiment, Figure 3 As shown, the filter assembly 20 further includes multiple layers of second filter material 22. These layers are positioned below the first filter material 21. The layers of second filter material 22 are spaced apart from each other and arranged vertically from the inside out. Each layer of second filter material 22 is connected to a plurality of sets of clearing valves 31. Each layer of second filter material 22 is connected to a backflush valve assembly 110.

[0041] The second filter material 22 can be a sintered microporous filter material made of organic, inorganic or metal materials, etc., which is not limited in this case. Preferably, the filtration diameter of the second filter material 22 is 0.1 μm to 100 μm.

[0042] In some preferred embodiments, the second filter material 22 can be a single filter material in the form of a rod, plate, or other suitable shape, or a filter material assembly formed by combining multiple single filter materials. Preferably, the second filter material 22 is larger than the first filter material 21, providing a larger filtration area.

[0043] It should be noted that the “multi-layer” described in this application refers to multiple layers above and below in the longitudinal direction, and the “multi-level” refers to multiple layers inside and outside in the radial direction.

[0044] In some preferred embodiments, the present invention further provides a filtration and concentration method, which uses any of the above-mentioned microporous filtration and concentration devices to perform filtration and concentration. The filtration and concentration method comprises the following steps: The slurry is fed into the liquid inlet pipeline valve group 40 and the feed pipeline valve group 50, and the gas is introduced through the air inlet pipeline valve group 60 at a given pressure to squeeze, filter and clear the slurry; The stirring device 80 stirs the slurry to prevent sedimentation and make the slurry uniform, so that the slurry is dispersed and fully contacts the first filter material 21 and the second filter material 22; The liquid level and the clearing flow rate in the tank 10 are detected in real time by the liquid level meter 70 and the flow meter 100, and the corresponding clearing valve 31 is selectively opened or closed according to the liquid level and the clearing flow rate to prevent gas from escaping; A running time threshold or a clear liquid flow threshold is set. When the set time threshold is reached or the clear liquid flow is lower than the set threshold, the backflush regeneration valve group 110 is opened to ensure the filtering state of the first filter material 21 and the second filter material 22.

[0045] In some embodiments, taking the existing 6m³ ​​mixing tank and 25㎡ filter element microporous filtration equipment as an example, when the same clearing flow rate requirements are met, the above-mentioned microporous filtration concentration equipment solution is adopted, which can reduce the equipment volume to less than 5m³, the filter element filtration area to 14㎡, and the gas escape loss to 20% of the original.

[0046] In summary, the present invention provides a microporous filtration and concentration device and method thereof. Compared with the prior art, the filter components inside the tank body are arranged horizontally with upper and lower spacing, which breaks the vertical linkage relationship and horizontal linkage relationship between the filter materials, and realizes independent control of each filter material, avoiding the problem that the multi-level filter materials of the layer stop filtering at the same time due to the closure of the clearing of the corresponding layer of filter material after the filter material is exposed to the liquid surface, resulting in a large reduction in the proportion of filter elements effectively used for filtration, resulting in low filtration efficiency and poor filtration effect.

[0047] Although terms such as filter assembly and clean-out line valve group are frequently used herein, the possibility of using other terms is not excluded. These terms are used only to more conveniently describe and explain the essence of the present invention; interpreting them as any additional limitations is contrary to the spirit of the present invention.

[0048] In addition, those skilled in the art should understand that, although there are many problems in the prior art, each embodiment or technical solution of the present invention may be improved in only one or several aspects, without having to simultaneously solve all the technical problems listed in the prior art or background art. Those skilled in the art should understand that any content not mentioned in a claim should not be construed as limiting the claim.

[0049] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A microporous filtration and concentration device, characterized in that: include A tank body, wherein the tank body is provided with a liquid inlet pipeline valve group, a material inlet pipeline valve group and an air inlet pipeline valve group; A filter assembly, the filter assembly comprising multiple layers of first filter material, the multiple layers of the first filter material are horizontally arranged in the tank body with intervals up and down; A clearing pipeline valve group, the clearing pipeline valve group includes multiple groups of clearing valves, the multiple groups of clearing valves are respectively connected to each layer of the first filter material of the filter component, and a flow meter is provided downstream of the clearing pipeline valve group for detecting the flow in the clearing pipeline valve group.

2. The microporous filtration and concentration device according to claim 1, characterized in that: The specifications and sizes of the first filter materials at different levels are different.

3. The microporous filtration and concentration device according to claim 1, characterized in that: The size of the first filter material at the lower layer is larger than the size of the first filter material at the higher layer.

4. The microporous filtration and concentration device according to any one of claims 1 to 3, characterized in that: The filtration diameter of the first filter material is 0.1 μm to 100 μm.

5. The microporous filtration and concentration device according to claim 1, characterized in that: The microporous filtration and concentration equipment further comprises a liquid level gauge and a pressure gauge, and the liquid level gauge and the pressure gauge are respectively arranged on the tank body.

6. The microporous filtration and concentration device according to claim 1, characterized in that: The microporous filtration and concentration equipment also includes a stirring device, and the stirring device extends into the tank body.

7. The microfiltration concentration device according to claim 1, characterized in that: The microporous filtration and concentration device further comprises a backflush pipeline valve group, one end of which is connected to the air intake pipeline valve group, and the other end of which is respectively connected to each layer of the first filter material.

8. The microfiltration concentration device according to claim 7, characterized in that: The back-blowing pipeline valve group includes multiple groups of back-blowing valves, and the multiple groups of back-blowing valves are respectively arranged between each group of the clearing valves and each layer of the first filter material.

9. The microporous filtration and concentration device according to claim 7, characterized in that: The filter assembly further comprises a multi-level second filter material, the multi-level second filter material is located below the first filter material, and the multi-level second filter material is spaced from the inside to the outside and arranged vertically; The second filter material at each level is respectively connected to a plurality of groups of the clearing valves, and the second filter material at each level is respectively connected to the backwash pipeline valve group.

10. A filtration and concentration method, characterized in that: Filtration and concentration are performed using the microporous filtration and concentration equipment as described in any one of claims 1 to 9.

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