A system and method for treating silt-laden production wastewater

Abstract

The present application relates to sewage treatment technical field, specifically to a kind of processing system and method for containing silt production wastewater.The processing system includes: sedimentation tank, outlet is provided in the side of sedimentation tank, and guide outlet is provided in the bottom of sedimentation tank;Filtering device is used to filter lower mixture from guide outlet, including support, connecting ring and multiple filter cartridges;For any filter cartridge, the filter cartridge includes support, upper support ring, lower support ring and filter element;Upper support ring and lower support ring are fixedly connected to support, filter element is installed between upper support ring and lower support ring, and opening and closing assembly is provided in the bottom of lower support ring;Each support is fixedly connected to connecting ring, and connecting ring is rotatably connected with support rod;Cake pressing device is used to press filter residue filtered by filtering device into mud cake.It can increase the filtering duration of containing silt production wastewater, improve filtrate purity, reduce the moisture content of filter residue, and realize self-cleaning of filter element.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of sewage treatment, in particular to a treatment system and method for sand-containing production wastewater. BACKGROUND

[0002] In the production process such as ore washing, dust reduction, etc. in mining operations, a large amount of sand-containing production wastewater containing sand and fine particle ore powder is continuously generated. If the sand-containing production wastewater is directly discharged without treatment, not only environmental problems such as surface runoff pollution, water turbidity, farmland siltation, and water ecological system destruction are caused, but also serious ecological risks such as water eutrophication, water resource waste, and groundwater infiltration pollution in the surrounding area of the mine are easily caused. At the same time, a large amount of sediment deposition may also block the drainage ditch, damage the surrounding infrastructure, and bring potential risks to the safety production of the mine.

[0003] Therefore, the sand in the sand-containing production wastewater is usually separated to obtain relatively clean water and slurry with high sand content. Thus, the relatively clean water obtained by separation can be used for the ore washing step of the production process, thereby reducing the use amount of clean water source in the production process and making the production process more environmentally friendly. In addition, in order to facilitate the storage, transportation and reuse of the slurry, the slurry is usually pressed into a mud cake by a filter press or other filter equipment.

[0004] However, when the sand-containing production wastewater is separated and treated by the prior art, the sand-containing production wastewater to be treated usually has a short filtration time, which results in high water content of the slurry obtained by filtration separation, and the filtration assembly of the separation and filtration equipment needs to be stopped for cleaning (for example, a pool bottom sludge separation and treatment equipment based on aquaculture is disclosed in Chinese patent CN202510787386.3, which realizes rapid separation, efficient cleaning and precise resetting of the liquid permeation mechanism through the combination of electromagnetic adsorption and automatic transmission, thereby solving the problem that the existing equipment needs to be manually disassembled and cleaned after the filtration component is blocked, which leads to interruption of the filtration separation process and low efficiency, but the filtration separation process still needs to be interrupted). SUMMARY

[0005] The present application aims to provide a treatment system and method for sand-containing production wastewater, which can at least partially overcome the above technical problems, efficiently separate and filter the sand-containing production wastewater, increase the filtration time of the sand-containing production wastewater to be treated, improve the filtrate purity, reduce the water content of the filter residue, and realize self-cleaning of the filter.

[0006] The application provides a treatment system for silt-containing production wastewater, which comprises a sedimentation tank, a liquid outlet arranged on the side of the sedimentation tank, and a guide outlet arranged on the bottom of the sedimentation tank; a filtering device for filtering the lower mixture from the guide outlet, the filtering device comprising a support rod, a connecting ring, and a plurality of filter cartridges; each filter cartridge comprising a support, an upper support ring, a lower support ring, and a filter element; the upper support ring and the lower support ring are fixedly connected to the support, and the filter element is installed between the upper support ring and the lower support ring; an opening and closing assembly is arranged on the bottom of the lower support ring; each support is fixedly connected to the connecting ring, and the connecting ring is rotationally connected to the support rod; and a cake pressing device for pressing the filter residue filtered by the filtering device into a mud cake.

[0007] Further, the filter cartridge further comprises a constraint ring and a push rod; the constraint ring is located above the upper support ring and is fixedly connected to the support; the push rod is slidingly inserted into the constraint ring and slides in a direction parallel to the axial direction of the filter cartridge; a push plate is fixedly installed on the lower end of the push rod; when the push plate is located inside the filter cartridge, the peripheral wall of the push plate abuts against the inner side wall of the filter element; and the filtering device further comprises a telescopic mechanism capable of driving the push rod to reciprocate along the axial direction of the filter cartridge.

[0008] Further, an abutting portion is arranged on the end of the push rod away from the push plate; the telescopic mechanism comprises an abutting disc and a first compression spring corresponding to the push rod; the abutting disc is installed above the support rod, and a protruding portion is annularly arranged on the lower end surface of the abutting disc; the two ends of the first compression spring abut against the abutting portion and the constraint ring respectively, so that the abutting portion abuts against the lower surface of the protruding portion; during the rotation of the filter cartridge around the support rod, the push rod can first move downward under the abutting action of the protruding portion until the push plate is inserted into the filter cartridge, and then move upward under the action of the first compression spring until the push plate is pulled out of the filter cartridge.

[0009] Alternatively, the telescopic mechanism comprises an abutting disc installed above the support rod, a protruding portion annularly arranged on the lower end surface of the abutting disc, and a sliding groove annularly arranged on the lower surface of the protruding portion; a convex head adapted to the sliding groove is fixedly arranged on the end of the push rod away from the push plate, and the push rod is slidingly installed in the sliding groove through the convex head; during the rotation of the filter cartridge around the support rod, the push rod can first move downward under the abutting action of the protruding portion until the push plate is inserted into the filter cartridge, and then move upward under the action of the sliding groove and the convex head until the push plate is pulled out of the filter cartridge.

[0010] Further, a boss is arranged on the lower surface of the push plate, a plurality of scraping blades are arranged on the circumferential wall of the boss, and in the case that the push plate is inserted into the filter cartridge, the scraping blades abut against the inner side wall of the filter element at the end away from the boss; a spiral groove is arranged on the outer circumferential wall of the push rod, and a sliding pin is arranged on the inner circumferential wall of the constraint ring, and the sliding pin is inserted into the spiral groove.

[0011] Further, the filter element is a flexible filter bag, and a rigid mesh plate is arranged outside the filter element; the rigid mesh plate is fixedly connected with the upper support ring and / or the lower support ring, and the rigid mesh plate covers the outer side of the flexible filter bag.

[0012] Optionally, the filter element is a flexible filter bag, and a sleeve ring is further arranged between the upper support ring and the lower support ring and is slidably arranged along the axial direction of the filter cartridge, and the inner wall of the sleeve ring abuts against the outer wall of the flexible filter bag; an abutting rod is connected to the push rod, and in the case that the push rod is inserted into the filter cartridge, the abutting rod can abut against the upper end surface of the sleeve ring and push the sleeve ring downward; the sleeve ring is connected with the lower support ring through a second compression spring, or the sleeve ring is connected with the upper support ring through a tension spring.

[0013] Further, the filter cartridges are uniformly distributed along the circumferential direction of the connecting ring, and a guide groove is arranged between any two adjacent filter cartridges, and the two ends of the guide groove are connected to the upper side of an upper support ring; each guide groove is located on a cylindrical surface coaxial with the connecting ring; from one end of the guide groove to the other end, the height of the groove bottom of the guide groove gradually increases or gradually increases and then gradually decreases.

[0014] Further, the opening and closing assembly comprises an opening and closing plate, a stop block and a reset spring; the upper surface of the opening and closing plate abuts against the lower surface of the lower support ring; a lever radially extends on the opening and closing plate, and the lever and the lower support ring are rotationally connected; the stop block is fixedly arranged; one end of the reset spring is connected with the lever, and the other end is connected with the lower support ring; in the process that the filter cartridge rotates around the support rod, the stop block can abut against the lever and make the lever rotate, so that the opening and closing plate opens the bottom of the lower support ring, and in the process that the filter cartridge continues to rotate around the support rod, the lever is separated from the stop block and makes the opening and closing plate block the bottom of the lower support ring under the action of the reset spring.

[0015] Further, a first liquid collecting groove is fixedly connected to the lower support ring, and the filter device further comprises a second liquid collecting groove, and each first liquid collecting groove is connected to the second liquid collecting groove; in the vertical projection, the projection contour of the filter element is located outside the projection contour of the second liquid collecting groove.

[0016] Further, a stirring motor and a stirring paddle are arranged in the sedimentation tank, and the stirring paddle is located at the lower part of the sedimentation tank and rotates under the driving of the stirring motor.

[0017] In another aspect, the application provides a treatment method for the mud-containing production wastewater, which is based on the treatment system described above, and the treatment method comprises: S1, delivering the mud-containing production wastewater to be treated to the sedimentation tank for a first preset time period; S2, returning the upper liquid obtained after the standing to the production stage for reuse, and delivering the lower mixture to the filter device for filtration; and S3, returning the filtrate filtered out to the production stage for reuse, and delivering the filter residue to the cake pressing device for pressing into a mud cake.

[0018] Further, the delivering of the lower mixture to the filter device for filtration comprises disturbing the lower mixture in the sedimentation tank while the lower mixture is delivered to the filter device.

[0019] Compared with the prior art, the application has the following advantages and beneficial effects:

[0020] 1. The treatment system and method for the mud-containing production wastewater provided by the embodiments of the application can preliminarily treat the mud-containing production wastewater to be treated by the sedimentation tank, thereby obtaining the mud-containing production wastewater that is preliminarily concentrated, and reducing the processing capacity of the filter device; the multiple filter cartridges are fixedly installed on the connecting ring, and the connecting ring and the fixedly arranged support rod are rotationally connected, thereby forming the multi-station filter device, realizing the further concentration of the lower mixture, and reducing the processing capacity of the cake pressing device; the filter device filters the lower mixture, so that the filter residue entering the cake pressing device has a lower water content, and the mud cake obtained by pressing the filter residue has a lower water content, thereby being more convenient for carrying, stacking and the like;

[0021] 2. The treatment system and method for the mud-containing production wastewater provided by the embodiments of the application can drive the push rod to press downward by the telescopic mechanism after any filter cartridge receives the lower mixture, thereby pressurizing the lower mixture in the filter cartridge, promoting the filtration process of the filter cartridge, and further reducing the water content of the filter residue; and in the process of pressing downward of the push rod, the push plate abutting against the inner side wall of the filter element can scrape the mud sand adhered to the inner side wall of the filter element, avoiding the blocking of the inner side wall of the filter element by the mud sand, realizing the self-cleaning of the filter element, and thereby ensuring the filtration effect of the filter element in the next filtration operation.

[0022] 3. The treatment system and method for the mud-containing production wastewater provided by the embodiments of the application can use the flexible filter bag as the filter element, thereby improving the purity of the filtrate and facilitating the reuse of the filtrate in the production stage. BRIEF DESCRIPTION OF DRAWINGS

[0023] The accompanying drawings, which are included to provide a further understanding of embodiments of the invention and form part of this application, do not constitute a limitation thereof. In the drawings:

[0024] Figure 1 A three-dimensional structural schematic diagram of a filtration device according to an embodiment of the present invention;

[0025] Figure 2 According to Figure 1 A partial three-dimensional structural diagram of a filter cartridge in the filtration device;

[0026] Figure 3 According to Figure 2 A drawn longitudinal sectional view;

[0027] Figure 4 A schematic diagram illustrating a push rod that is slidably mounted in a groove of a protrusion via a protrusion head, according to an embodiment of the present invention.

[0028] Figure 5 A plan view of the protrusion drawn according to an embodiment of the present invention;

[0029] Figure 6 A three-dimensional structural diagram of a filter cartridge in a filtration device according to an embodiment of the present invention;

[0030] Figure 7 According to Figure 1 A top view of the filter device;

[0031] Figure 8 A cross-sectional view of the filtering device according to an embodiment of the present invention;

[0032] Figure 9 This is a schematic diagram of the connection structure between the abutment plate and the support rod according to an embodiment of the present invention.

[0033] The attached diagram shows the markings and corresponding component names:

[0034] 2-Support rod; 21-Drive motor; 22-Adjusting screw; 3-Connecting ring; 31-Gear; 4-Filter cartridge; 41-Bracket; 42-Upper support ring; 43-Lower support ring; 431-Limiting block; 44-Filter element; 45-Constraint ring; 46-Push rod; 461-Push plate; 462-Abutting part; 463-Protrusion; 464-Boss; 465-Scraper; 466-Spiral groove; 467-Abutting rod; 47-Abutting plate; 471-Protrusion; 4711-Slide groove; 472-Sleeve; 48-First compression spring; 51-Collar ring; 52-Second compression spring; 53-Tension spring; 54-Guide groove; 55-Opening and closing plate; 551-Toggle rod; 56-Stop block; 57-Reset spring; 58-First liquid collection tank; 59-Second liquid collection tank; 7-Ground. DETAILED DESCRIPTION

[0035] In order to make the objects, technical solutions and advantages of the present application clearer, the present application will be further described in detail below with reference to the embodiments and drawings, and the illustrative embodiments of the present application and their descriptions are only used to explain the present application, and not as a limitation of the present application. It should be noted that the present application has been in the actual research and development stage.

[0036] In the production process such as washing ore, dust reduction, etc. in mining operations, a large amount of silt-containing production wastewater containing silt and fine particle ore powder will be continuously generated. If the silt-containing production wastewater is not treated and directly discharged, not only will it cause environmental problems such as surface runoff pollution, water turbidity, farmland siltation, and water ecological system destruction, but also it will easily lead to serious ecological risks such as eutrophication of water bodies around the mining area, water resource waste, and groundwater infiltration pollution, etc. At the same time, a large amount of silt deposition may also block drainage ditches and destroy surrounding infrastructure, posing potential risks to mine safety production.

[0037] Therefore, the silt in the silt-containing production wastewater is usually separated to obtain relatively clear water and slurry with a high silt content. In this way, the relatively clear water obtained by separation can be used for the ore washing step of the production process, thereby reducing the amount of clean water used in the production process and making the production process more environmentally friendly. In addition, in order to facilitate the storage, transportation and reuse of the slurry, the slurry is usually pressed into a cake by using a filter press or other filter equipment.

[0038] However, when the silt-containing production wastewater is treated by the prior art, there are usually problems such as that the silt-containing production wastewater to be treated has a short filtration time, which results in high water content in the slurry obtained by filtration separation, and the filtration components of the filtration and separation equipment need to be stopped for cleaning (for example, a pool bottom sludge separation and treatment equipment based on aquaculture disclosed in Chinese patent CN202510787386.3, which realizes rapid separation, efficient cleaning and precise resetting of the liquid permeation mechanism through the combination of electromagnetic adsorption and automatic transmission, thereby solving the problem that the existing equipment needs to be manually disassembled and cleaned after the filtration components are blocked, which leads to interruption of the filtration and separation process and low efficiency, but still needs to interrupt the filtration and separation process).

[0039] Therefore, the present application provides a treatment system and method for silt-containing production wastewater, which can efficiently separate and filter the silt-containing production wastewater, increase the filtration time of the silt-containing production wastewater to be treated, improve the purity of the filtrate, reduce the water content of the filter residue, and realize self-cleaning of the filter.

[0040] Embodiment 1:

[0041] As shown in Figure 1 The treatment system for silt-containing production wastewater includes:

[0042] a sedimentation tank, a liquid outlet is arranged at a side of the sedimentation tank, and a guide outlet is arranged at a bottom of the sedimentation tank;

[0043] a filtering device for filtering the lower mixture from the guide outlet, the filtering device comprises a support rod 2, a connecting ring 3, and a plurality of filter cartridges 4; for any filter cartridge 4, the filter cartridge 4 comprises a support frame 41, an upper support ring 42, a lower support ring 43, and a filter element 44; the upper support ring 42 and the lower support ring 43 are fixedly connected to the support frame 41, the filter element 44 is installed between the upper support ring 42 and the lower support ring 43, and an opening and closing assembly is arranged at a bottom of the lower support ring 43; each support frame 41 is fixedly connected to the connecting ring 3, and the connecting ring 3 is rotationally connected to the support rod 2;

[0044] a cake pressing device for pressing the filter residue filtered by the filtering device into a mud cake.

[0045] Preferably, the liquid outlet is a plurality of liquid outlets, and at least one liquid outlet is arranged at any height position of the sedimentation tank.

[0046] Therefore, after the sedimentation of the to-be-treated production wastewater containing silt in the sedimentation tank, the upper liquid can be discharged from any height position. It is worth noting that, due to the differences in the total amount of the to-be-treated production wastewater containing silt, the silt content, and the like, the amount of the lower mixture obtained will also be different. The embodiment can adapt to the to-be-treated production wastewater containing silt with different total amounts and silt contents by arranging a plurality of liquid outlets with different height positions, and selecting an appropriate liquid outlet to discharge the upper liquid according to the height position of the lower mixture after the sedimentation. Therefore, the water content in the lower mixture injected into the filtering device can be reduced as much as possible (i.e., the amount of the lower mixture to be filtered and treated will not increase due to the mixing of too much upper liquid), and the filtering efficiency of the filtering device is improved.

[0047] Preferably, the filter cartridges 4 are circumferentially distributed along the connecting ring 3, a guide groove 54 is arranged between any two adjacent filter cartridges 4, and two ends of the guide groove 54 are connected to the upper side of an upper support ring 42; each guide groove 54 is located on a cylindrical surface coaxial with the connecting ring 3;

[0048] From one end of the guide groove 54 to the other end, the height of the groove bottom of the guide groove 54 gradually increases or gradually increases and then gradually decreases (in the filtering device shown in the figure, the height of the groove bottom of the guide groove 54 gradually increases from one end to the other end). Figure 1

[0049] ​Thus, the guide outlet is connected to any position (i.e. injection position) above the guide groove 54 of the filter device, and then the connecting ring 3 is rotated, so that each filter cartridge 4 is rotated to the injection position below to receive the lower mixture from the guide outlet (when the filter cartridge 4 is not directly below the injection position, the corresponding guide groove 54 is used for guiding), and the continuously discharged lower mixture from the guide outlet is injected into each filter cartridge 4 one by one, so that the filtering process is continuous, consistent and efficient; and the filter cartridge 4 receiving the lower mixture can continuously perform the filtering operation during the subsequent rotation, thereby increasing the filtering time while maintaining uninterrupted filtering operation.

[0050] Preferably, as shown in Figure 6 to Figure 8 The opening and closing assembly includes an opening and closing plate 55, a stop block 56 and a reset spring 57.

[0051] The upper surface of the opening and closing plate 55 abuts the lower surface of the lower support ring 43; a radial extension of a lever 551 is provided on the opening and closing plate 55, and the lever 551 is rotationally connected to the lower support ring 43; the stop block 56 is fixedly arranged (for example, the stop block 56 is fixedly mounted on the ground 7); one end of the reset spring 57 is connected to the lever 551, and the other end is connected to the lower support ring 43.

[0052] During the rotation of the filter cartridge 4 around the support rod 2, the stop block 56 can abut the lever 551 and rotate the lever 551, thereby causing the opening and closing plate 55 to open the bottom of the lower support ring 43; and during the continuous rotation of the filter cartridge 4 around the support rod 2, the lever 551 is disengaged from the stop block 56 and causes the opening and closing plate 55 to block the bottom of the lower support ring 43 under the action of the reset spring 57. It should be understood that the stop block 56 is arranged before the injection position, and the filter cartridge 4 completes the action of opening and closing the bottom of the lower support ring 43 by the opening and closing plate 55 before receiving the lower mixture at the injection position.

[0053] Thus, during the rotation of the connecting ring 3, each filter cartridge 4 can perform filtering during the rotation after receiving the lower mixture at the injection position, and the filter residue can be discharged before the next arrival at the injection position; obviously, in the case of continuous input of the lower mixture from the guide outlet, the filter device provided in the embodiment only needs to continuously rotate the connecting ring 3, and each filter cartridge 4 can continuously and efficiently perform the filtering and residue discharging operation, thereby continuously, consistently and efficiently completing the filtering operation of the lower mixture.

[0054] Preferably, as shown in Figure 1 to Figure 3 and Figure 6 to Figure 7 A first liquid collecting groove 58 is fixedly connected to the lower support ring 43, and the filter device further includes a second liquid collecting groove 59, and each first liquid collecting groove 58 is connected to the second liquid collecting groove 59.

[0055] In the projection in the vertical direction, the projection profile of the filter element 44 is outside the projection profile of the second collecting tank 59.

[0056] Therefore, by fixing the first collecting tank 58 on the lower support ring 43, the embodiment can be used to receive the filtrate filtered by the filter cartridge 4, and by connecting each first collecting tank 58 to the second collecting tank 59, the filtrate can be conveniently extracted for reuse in the production stage. The projection profile of the filter element 44 is outside the projection profile of the second collecting tank 59, which can prevent the filter residue discharged from the filter cartridge 4 from falling into the second collecting tank 59, thereby achieving the isolation of the filtrate and the filter residue.

[0057] Preferably, a stirring motor and a stirring paddle are further arranged in the sedimentation tank, and the stirring paddle is located at the lower part of the sedimentation tank and rotates under the drive of the stirring motor. It should be understood that the stirring motor is fixedly installed above the sedimentation tank, and the stirring paddle is used to disturb the lower mixture during the process of discharging the lower mixture, so as to homogenize the lower mixture.

[0058] Therefore, the same batch of lower mixture can be more uniformly fed into the filter cartridge 4, and the filtering process of the filtering device can be stably performed (if the lower mixture in a certain filter cartridge 4 is too thin, the excessive water cannot be filtered out in time, and the residual water in the filter residue is too much).

[0059] It should be understood that the cake pressing device is a mature product, which is used to press the filter residue filtered by the filtering device into a mud cake, such as the plate-and-frame filter press described above, and will not be described herein. Preferably, a section below the elevation of the opening and closing plate 55 between the position of the stop block 56 and the injection position is provided with a receiving hopper or a conveying belt (not shown in the figure) for receiving the filter residue, so as to facilitate the input of the filter residue into the cake pressing device.

[0060] Accordingly, the processing system for the production wastewater containing silt provided by the embodiment can preliminarily treat the production wastewater containing silt to be treated by the sedimentation tank, thereby obtaining the preliminarily concentrated production wastewater containing silt (i.e., the lower mixture in the sedimentation tank), and reducing the processing capacity of the filtering device; a plurality of filter cartridges 4 are fixedly installed on the connecting ring 3, and the connecting ring 3 and the fixedly arranged support rod 2 (for example, the support rod 2 is fixedly installed on the ground 7) are rotationally connected, thereby forming a multi-station filtering device, achieving further concentration of the lower mixture (i.e., the filter residue), and reducing the processing capacity of the cake pressing device; the filtering device filters the lower mixture, so that the filter residue entering the cake pressing device has a lower water content, which can make the mud cake pressed by the cake pressing device have a lower water content, thereby being more convenient for transportation, stacking, and the like.

[0061] Embodiment 2:

[0062] As Figure 1 to Figure 3The present embodiment is based on the embodiment 1, and the difference is that, in the present embodiment:

[0063] The filter cartridge 4 further comprises a constraint ring 45 and a push rod 46; the constraint ring 45 is located above the upper support ring 42 and fixedly connected with the support 41, and the push rod 46 is slidingly inserted into the constraint ring 45 and the relative sliding direction thereof is parallel to the axial direction of the filter cartridge 4;

[0064] A push plate 461 is fixedly installed at the lower end of the push rod 46, and when the push plate 461 is located inside the filter cartridge 4, the peripheral wall of the push plate 461 abuts against the inner side wall of the filter element 44;

[0065] The filter device further comprises a telescopic mechanism capable of driving the push rod 46 to reciprocate along the axial direction of the filter cartridge 4.

[0066] Therefore, in the filter device provided by the present embodiment, after any filter cartridge 4 receives the lower layer mixture, the push rod 46 is driven by the telescopic mechanism to be pressed downward, thereby pressurizing the lower layer mixture in the filter cartridge 4, promoting the filtration process of the filter cartridge 4, and further reducing the water content of the filter residue. In the process of pressing the push rod 46 downward, the push plate 461 abutting against the inner side wall of the filter element 44 can scrape the silt adhering to the inner side wall of the filter element 44, avoiding the silt from blocking the inner side wall of the filter element 44, realizing the self-cleaning of the filter element 44, and thereby ensuring the filtering effect of the filter element 44 when the filter cartridge 4 performs the filtration operation next time.

[0067] Specifically, an abutting portion 462 is arranged at the end of the push rod 46 away from the push plate 461, and the telescopic mechanism comprises an abutting disc 47 and a first compression spring 48 corresponding to the push rod 46;

[0068] The abutting disc 47 is installed above the support rod 2, and a protruding portion 471 is arranged at the lower end surface of the abutting disc 47 in a ring shape;

[0069] The two ends of the first compression spring 48 respectively abut against the abutting portion 462 and the constraint ring 45, so that the abutting portion 462 abuts against the lower surface of the protruding portion 471;

[0070] During the rotation of the filter cartridge 4 around the support rod 2, the push rod 46 can first move downward under the abutting action of the protruding portion 471 to insert the push plate 461 into the filter cartridge 4, and then move upward under the action of the first compression spring 48 to pull out the push plate 461 from the filter cartridge 4.

[0071] Therefore, the filter device provided by the embodiment does not need to additionally add a power source, and the reciprocating movement of the push rod 46 in each filter cartridge 4 along the axial direction of the filter cartridge 4 can be realized by the rotation of the connecting ring 3. It should be understood that the installation angle (referring to the angle in the rotation direction of the connecting ring 3) of the protruding portion 471 should ensure that the protruding portion 471 makes the push rod 46 move downward to the position where the push plate 461 is inserted into the filter cartridge 4 before the filter cartridge 4 has completed the process of receiving the lower mixture, and the push rod 46 can move upward to the position where the push plate 461 is pulled out of the filter cartridge 4 before the opening and closing plate 55 of the filter cartridge 4 is opened (obviously, the height of the push plate 461 at this time should be higher than the position where the lower mixture is injected).

[0072] Alternatively, as shown in another specific implementation of the embodiment, the telescopic mechanism comprises an abutting disc 47 installed above the supporting rod 2, a protruding portion 471 is annularly arranged on the lower end surface of the abutting disc 47, and a sliding groove 4711 is annularly arranged on the lower surface of the protruding portion 471. Figure 4

[0073] A convex head 463 adapted to the sliding groove 4711 is fixedly arranged at the end of the push rod 46 away from the push plate 461, and the push rod 46 is slidingly installed in the sliding groove 4711 through the convex head 463.

[0074] During the rotation of the filter cartridge 4 around the supporting rod 2, the push rod 46 can first move downward to the position where the push plate 461 is inserted into the filter cartridge 4 under the abutting action of the protruding portion 471, and then move upward to the position where the push plate 461 is pulled out of the filter cartridge 4 under the action of the sliding groove 4711 and the convex head 463.

[0075] In this implementation, by using the constraint of the sliding groove 4711 on the convex head 463, the push rod 46 can be pressed downward and lifted upward by the protruding portion 471 during the rotation of the connecting ring 3, so that the structure of the filter device is simpler.

[0076] Obviously, in order to ensure that the upward and downward positions of the push rod 46 in each filter cartridge 4 are determined (i.e., the downward position after completing the reception of the lower mixture, and the pulling-out position before the opening and closing plate 55 is opened), the installation and connection of the abutting disc 47 and the supporting rod 2 should limit the circumferential rotation therebetween along the supporting rod 2 in the embodiment.

[0077] Preferably, as shown in the embodiment, the abutting disc 47 is annularly arranged on the supporting rod 2, and the protruding portion 471 is annularly arranged on the lower end surface of the abutting disc 47. Figure 5 ​As shown, the protruding part 471 of the abutting disc 47 includes, in sequence along the circumference, an injection section, a pressing-down section, a pressure-maintaining section and a lifting section. Obviously, for any filter cartridge 4, in the injection section, the filter cartridge 4 is in the process of receiving the lower layer mixture, the push rod 46 is located at the upper limit position, facilitating the injection of the lower layer mixture; in the pressing-down section, the filter cartridge 4 has completed the reception of the lower layer mixture, and the push rod 46 is gradually pressed down; in the pressure-maintaining section, the push rod 46 is located at the lower limit position, so that the lower layer mixture in the space between the push plate 461 and the opening and closing plate 55 is always in a state of being extruded, prompting the filter residue to further drain water; in the lifting section, the push rod 46 is gradually lifted, and then the push plate 461 is extracted from the filter cartridge 4, facilitating the filter cartridge 4 to receive the lower layer mixture again. More preferably, the slope of the pressing-down section is much smaller than the slope of the lifting section, so that the pressing-down section can be designed to be longer (i.e. longer in the circumferential length, and the pressing-down process is slower), so as to avoid damaging the filter element 44 due to too fast pressing down.

[0078] Embodiment 3:

[0079] As shown, the protruding part 471 of the abutting disc 47 includes, in sequence along the circumference, an injection section, a pressing-down section, a pressure-maintaining section and a lifting section. Obviously, for any filter cartridge 4, in the injection section, the filter cartridge 4 is in the process of receiving the lower layer mixture, the push rod 46 is located at the upper limit position, facilitating the injection of the lower layer mixture; in the pressing-down section, the filter cartridge 4 has completed the reception of the lower layer mixture, and the push rod 46 is gradually pressed down; in the pressure-maintaining section, the push rod 46 is located at the lower limit position, so that the lower layer mixture in the space between the push plate 461 and the opening and closing plate 55 is always in a state of being extruded, prompting the filter residue to further drain water; in the lifting section, the push rod 46 is gradually lifted, and then the push plate 461 is extracted from the filter cartridge 4, facilitating the filter cartridge 4 to receive the lower layer mixture again. More preferably, the slope of the pressing-down section is much smaller than the slope of the lifting section, so that the pressing-down section can be designed to be longer (i.e. longer in the circumferential length, and the pressing-down process is slower), so as to avoid damaging the filter element 44 due to too fast pressing down. Figure 9

[0080] The abutting disc 47 and the support rod 2 are connected in sliding along the axial direction of the support rod 2, and an adjusting screw 22 is rotatably arranged on the support rod 2 and is in threaded connection with the abutting disc 47. More specifically, a sleeve 472 extends axially from the lower end surface of the abutting disc 47 and is slidably sleeved on the support rod 2; the adjusting screw 22 is rotatably arranged on the support rod 2 and is in threaded connection with the sleeve 472.

[0081] Thus, in the filter device provided in this embodiment, the height position of the abutting disc 47 can be adjusted by rotating the adjusting screw 22, and then the lower limit position after the push plate 461 is pressed down can be adjusted. Then, in the case that the injected lower layer mixture has a low amount of sand, the abutting disc 47 can be adjusted downward, and then the push plate 461 can be pressed down to a low enough position to ensure the pressure after pressing down, so as to achieve the purpose of reducing the water content of the filter residue. Correspondingly, in the case that the injected lower layer mixture has a high amount of sand, the abutting disc 47 can be adjusted upward, and then the push plate 461 will not be pressed down too much to cause excessive pressure and damage the filter element 44.

[0082] Embodiment 4:

[0083] As shown, the protruding part 471 of the abutting disc 47 includes, in sequence along the circumference, an injection section, a pressing-down section, a pressure-maintaining section and a lifting section. Obviously, for any filter cartridge 4, in the injection section, the filter cartridge 4 is in the process of receiving the lower layer mixture, the push rod 46 is located at the upper limit position, facilitating the injection of the lower layer mixture; in the pressing-down section, the filter cartridge 4 has completed the reception of the lower layer mixture, and the push rod 46 is gradually pressed down; in the pressure-maintaining section, the push rod 46 is located at the lower limit position, so that the lower layer mixture in the space between the push plate 461 and the opening and closing plate 55 is always in a state of being extruded, prompting the filter residue to further drain water; in the lifting section, the push rod 46 is gradually lifted, and then the push plate 461 is extracted from the filter cartridge 4, facilitating the filter cartridge 4 to receive the lower layer mixture again. More preferably, the slope of the pressing-down section is much smaller than the slope of the lifting section, so that the pressing-down section can be designed to be longer (i.e. longer in the circumferential length, and the pressing-down process is slower), so as to avoid damaging the filter element 44 due to too fast pressing down. Figure 6

[0084] ​​A boss 464 is arranged on the lower surface of the push plate 461, and a plurality of scraping blades 465 are arranged on the circumferential wall of the boss 464. When the push plate 461 is inserted into the filter cartridge 4, the scraping blades 465 abut against the inner side wall of the filter element 44 at the end away from the boss 464.

[0085] A spiral groove 466 is arranged on the outer circumferential wall of the push rod 46, and a sliding pin is arranged on the inner circumferential wall of the constraint ring 45, which is inserted into the spiral groove 466 (the sliding pin is not shown in the figure).

[0086] It should be understood that the helix angle of the spiral groove 466 should be large enough to ensure that the cooperation between the sliding pin and the spiral groove 466 can make the push rod 46 rotate smoothly (i.e., avoid self-locking) during the axial relative movement of the push rod 46 relative to the constraint ring 45. For the above-mentioned implementation scheme in which the push rod 46 is pressed down and lifted by the constraint of the protrusion 463 by the sliding groove 4711, the protrusion 463 is a rotary body with the axis of the push rod 46 as the axis, so that the protrusion 463 can rotate in the sliding groove 4711. Thus, in the sand-containing production wastewater treatment system provided in the present embodiment, the push plate 461 can scrape the inner side wall of the filter element 44 in the axial direction of the filter cartridge 4, and the scraping blades 465 can scrape the inner side wall of the filter element 44 in the circumferential direction of the filter cartridge 4 during the axial reciprocating linear motion of the push rod 46 along the filter cartridge 4, thereby strengthening the cleaning effect on the inner side wall of the filter element 44 through the dual action of axial scraping + circumferential scraping.

[0087] It should be noted that although the above-mentioned self-cleaning effect only occurs on the inner side wall of the filter element 44, it cannot clean the pores of the filter element 44; however, since the push rod 46 can be moved upward to pull out the push plate 461 from the filter cartridge 4 before the opening of the opening and closing plate 55 of the filter cartridge 4, the process of pulling out the push plate 461 from the filter cartridge 4 by the push rod 46 will generate a negative pressure in the section between the push plate 461 and the opening and closing plate 55, thereby causing the air outside the filter element 44 in this section to be sucked inward, and thus the pores of the filter element 44 can be cleaned by airflow flushing through the action of negative pressure suction, achieving the purpose of sucking some of the sand that has invaded the pores back into the filter cartridge 4. For the protrusion 471, a larger slope of the upward section of the push rod 46 that pulls out the push plate 461 from the filter cartridge 4 can save the time required to pull out the push rod 46 (i.e., the time for the push rod 46 to be pressed down can be extended), and a larger slope of the upward section can also make the negative pressure suction effect stronger.

[0088] Embodiment 5:

[0089] The present embodiment is based on Embodiment 2, and the difference lies in that in the present embodiment:

[0090] The filter element 44 is a flexible filter bag, and a rigid mesh plate is arranged outside the filter element 44.

[0091] The rigid mesh plate is fixedly connected to the upper support ring 42 and / or the lower support ring 43, and the rigid mesh plate covers the outer side of the flexible filter bag.

[0092] Therefore, by using a flexible filter bag as the filter element 44, this embodiment can improve the purity of the filtrate and facilitate its reuse in the production stage. By covering the outside of the flexible filter bag with a rigid mesh plate, the pusher 46 can be inserted into the filter cylinder 4 for pressurized filtration, and the pusher plate 461 can always be in contact with the inside of the flexible filter bag (the outside of the flexible filter bag is constrained by the rigid mesh plate), ensuring effective pressure on the lower mixture below.

[0093] Even better, such as Figure 3 As shown, in another specific practice of this embodiment, the filter element 44 is a flexible filter bag, and a collar 51 is slidably installed between the upper support ring 42 and the lower support ring 43 along the axial direction of the filter cylinder 4, with the inner wall of the collar 51 abutting against the outer wall of the flexible filter bag.

[0094] An abutment rod 467 is connected to the push rod 46. When the push rod 46 is inserted into the filter cartridge 4, the abutment rod 467 can abut against the upper end face of the collar 51 and push the collar 51 downward.

[0095] The collar 51 is connected to the lower support ring 43 via the second compression spring 52, or the collar 51 is connected to the upper support ring 42 via the tension spring 53.

[0096] It should be understood that in this embodiment, the travel of the collar 51 along the axial direction of the filter cylinder 4 is limited between the upper support ring 42 and the lower support ring 43. Therefore, in this practice, by fitting the collar 51 around the outside of the flexible filter bag and using the abutment rod 467 to push the collar 51 downwards synchronously with the push plate 461 during the downward pressing of the push rod 46 (occurring after the push plate 461 enters the filter cylinder 4), the collar 51 constrains the flexible filter bag located on the periphery of the push plate 461, ensuring that the push plate 461 always abuts against the inner side of the flexible filter bag, thus ensuring effective pressure on the lower layer mixture below. On the other hand, the flexible filter bag below the collar 51 bulges outwards under the pressure of the push plate 461 on the lower layer mixture below, causing the flexible filter bag at the lower edge of the collar 51 to bend. Consequently, the sediment adhering to the inner wall at this location is peeled and loosened by the bending action of the flexible filter bag, facilitating scraping during the downward pressing process of the push plate 461.

[0097] Example 6:

[0098] This embodiment provides a method for treating industrial wastewater containing silt and sand. This method is based on the aforementioned treatment system and includes:

[0099] S1, delivering the to-be-treated silt-containing production wastewater to a sedimentation tank for standing for a first preset time length;

[0100] S2, returning the upper liquid obtained after standing to a production stage for reuse, and delivering the lower mixture to a filtering device for filtering;

[0101] S3, returning the filtered filtrate to the production stage for reuse, and delivering the filter residue to a cake pressing device for pressing into a mud cake.

[0102] Preferably, before the step of delivering the to-be-treated silt-containing production wastewater to the sedimentation tank for standing for the first preset time length, the method further comprises adding a flocculating agent to the to-be-treated silt-containing production wastewater and stirring; and the step of delivering the lower mixture to the filtering device for filtering comprises disturbing the lower mixture in the sedimentation tank while delivering the lower mixture to the filtering device. It should be understood that the flocculating agent can be any flocculating agent used in the prior art to accelerate the sedimentation of suspended silt in silt-containing production wastewater.

[0103] The embodiment provides a treatment method for silt-containing production wastewater, which is suitable for treating silt-containing production wastewater containing silt and fine-particle ore powder generated in production processes such as ore washing and dust reduction in mining operations, can separate the silt therefrom and press the silt into a mud cake for storage, transportation and reuse, and can separate most of the water therefrom for reuse in the production stage, thereby achieving water saving.

[0104] It should be understood that, in the present application, unless otherwise specified, the terms “rotary connection” and “rotary arrangement” mean that only relative rotation can occur between the two, for example, the rotary arrangement of a hole and a shaft rod can be achieved by providing a shaft shoulder on the shaft and a limiting groove in the hole to limit the relative movement in the axial direction; the terms “sliding insertion”, “sliding installation” and “sliding sleeving” mean that only relative sliding can occur between the two, for example, dovetail grooves, T-shaped grooves and the like.

[0105] The above detailed description further describes the purpose, technical solutions and beneficial effects of the present application. It should be understood that the above description is only a specific embodiment of the present application and is not used to limit the protection scope of the present application. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A treatment system for industrial wastewater containing silt, characterized in that, include: A sedimentation tank, with a liquid outlet on the side and an outlet at the bottom; A filtration device for filtering a lower layer mixture from the outlet, the filtration device comprising a support rod (2), a connecting ring (3), and a plurality of filter cartridges (4); for any filter cartridge (4), the filter cartridge (4) comprises a bracket (41), an upper support ring (42), a lower support ring (43), and a filter element (44); the upper support ring (42) and the lower support ring (43) are both fixedly connected to the bracket (41), the filter element (44) is installed between the upper support ring (42) and the lower support ring (43), and an opening and closing assembly is provided at the bottom of the lower support ring (43); each bracket (41) is fixedly connected to the connecting ring (3), and the connecting ring (3) is rotatably connected to the support rod (2); A cake pressing device is used to press the filter residue obtained by the filtration device into a mud cake; The filter cartridge (4) also includes a constraint ring (45) and a push rod (46); the constraint ring (45) is located above the upper support ring (42) and is fixedly connected to the bracket (41); the push rod (46) is slidably inserted into the constraint ring (45) and the direction of their relative sliding is parallel to the axial direction of the filter cartridge (4); A push plate (461) is fixedly installed at the lower end of the push rod (46). When the push plate (461) is located inside the filter cartridge (4), the peripheral wall of the push plate (461) abuts against the inner wall of the filter element (44). The filtration device also includes a telescopic mechanism that can drive the push rod (46) to reciprocate along the axis of the filter cylinder (4); The filter element (44) is a flexible filter bag. A collar (51) is also slidably installed between the upper support ring (42) and the lower support ring (43) along the axial direction of the filter cylinder (4). The inner wall of the collar (51) abuts against the outer wall of the flexible filter bag. An abutment rod (467) is connected to the push rod (46). When the push rod (46) is inserted into the filter cartridge (4), the abutment rod (467) can abut against the upper end face of the collar (51) and push the collar (51) downward. The collar (51) is connected to the lower support ring (43) via a second compression spring (52), or the collar (51) is connected to the upper support ring (42) via a tension spring (53); During the process of the abutting rod (467) abutting against the upper end face of the collar (51) and pushing the collar (51) downward, the collar (51) is always flush with the push plate (461).

2. The processing system according to claim 1, characterized in that, An abutment (462) is provided at the end of the push rod (46) away from the push plate (461). The telescopic mechanism includes an abutment plate (47) and a first compression spring (48) corresponding to the push rod (46). The abutment plate (47) is installed above the support rod (2), and a protrusion (471) is provided circumferentially on the lower end face of the abutment plate (47). The two ends of the first compression spring (48) abut against the abutment part (462) and the constraint ring (45) respectively, so that the abutment part (462) abuts against the lower surface of the protrusion (471); During the rotation of the filter cylinder (4) around the support rod (2), the push rod (46) can first move downward under the pushing action of the protrusion (471) until the push plate (461) is inserted into the filter cylinder (4), and then move upward under the action of the first compression spring (48) until the push plate (461) is pulled out from the filter cylinder (4).

3. The processing system according to claim 1, characterized in that, The telescopic mechanism includes an abutment plate (47) installed above the support rod (2), a protrusion (471) is provided circumferentially on the lower end face of the abutment plate (47), and a circumferential groove (4711) is provided on the lower surface of the protrusion (471). A protrusion (463) adapted to the slide groove (4711) is fixedly provided at one end of the push rod (46) away from the push plate (461), and the push rod (46) is slidably installed in the slide groove (4711) through the protrusion (463); During the rotation of the filter cylinder (4) around the support rod (2), the push rod (46) can first move downward under the pushing action of the protrusion (471) until the push plate (461) is inserted into the filter cylinder (4), and then move upward under the action of the sliding groove (4711) and the protrusion (463) until the push plate (461) is pulled out from the filter cylinder (4).

4. The processing system according to claim 1, characterized in that, A boss (464) is also provided on the lower surface of the push plate (461), and a plurality of scrapers (465) are installed on the peripheral wall of the boss (464). When the push plate (461) is inserted into the filter cartridge (4), the end of the scraper (465) away from the boss (464) abuts against the inner wall of the filter element (44). A spiral groove (466) is provided on the outer peripheral wall of the push rod (46), and a sliding pin is provided on the inner peripheral wall of the constraint ring (45), the sliding pin being inserted into the spiral groove (466).

5. The processing system according to claim 1, characterized in that, The filter element (44) is a flexible filter bag, and a rigid mesh plate is fitted on the outside of the filter element (44); The rigid mesh plate is fixedly connected to the upper support ring (42) and / or the lower support ring (43), and the rigid mesh plate covers the outer side of the flexible filter bag.

6. The processing system according to claim 1, characterized in that, Each of the filter cartridges (4) is evenly distributed around the circumference of the connecting ring (3), and a guide groove (54) is installed between any two adjacent filter cartridges (4). The two ends of the guide groove (54) are respectively connected to the top of an upper support ring (42); each of the guide grooves (54) is located on a cylindrical surface coaxial with the connecting ring (3). From one end of the guide groove (54) to the other end, the bottom height of the guide groove (54) gradually increases or gradually increases and then gradually decreases.

7. The processing system according to claim 1, characterized in that, The opening and closing assembly includes an opening and closing plate (55), a stop block (56), and a return spring (57). The upper surface of the opening and closing plate (55) abuts against the lower surface of the lower support ring (43); a lever (551) extends radially on the opening and closing plate (55), and the lever (551) and the lower support ring (43) are rotatably connected; the stop block (56) is fixedly installed; one end of the return spring (57) is connected to the lever (551), and the other end is connected to the lower support ring (43); During the rotation of the filter cartridge (4) around the support rod (2), the stop block (56) can abut against the lever (551) and cause the lever (551) to rotate, thereby causing the opening and closing plate (55) to open the bottom of the lower support ring (43). During the continued rotation of the filter cartridge (4) around the support rod (2), the lever (551) disengages from the stop block (56) and, under the action of the return spring (57), causes the opening and closing plate (55) to block the bottom of the lower support ring (43).

8. The processing system according to claim 1, characterized in that, A first liquid collection tank (58) is fixedly connected to the lower support ring (43), and the filter device also includes a second liquid collection tank (59), with each of the first liquid collection tanks (58) connected to the second liquid collection tank (59). In the vertical projection, the projected outline of the filter element (44) is located outside the projected outline of the second liquid collection tank (59).

9. The processing system according to claim 1, characterized in that, The sedimentation tank is also equipped with a stirring motor and stirring blades. The stirring blades are located at the bottom of the sedimentation tank and rotate under the drive of the stirring motor.

10. A method for treating industrial wastewater containing silt, based on the treatment system described in any one of claims 1 to 9, characterized in that, include: S1, transport the production wastewater containing mud and sand to be treated to the sedimentation tank and let it stand for a first preset time; S2, the upper liquid obtained after settling is returned to the production stage for reuse, and the lower mixture is transported to the filtration device for filtration; S3, the filtered liquid is returned to the production stage for reuse, and the filter residue is transported to the cake pressing device to be pressed into mud cake.

11. The processing method according to claim 10, characterized in that, The step of conveying the lower layer mixture to the filtration device for filtration includes, while conveying the lower layer mixture to the filtration device, disturbing the lower layer mixture in the sedimentation tank.

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