Treatment system and method for silt-containing production wastewater

Abstract

The invention relates to the technical field of sewage treatment, in particular to a treatment system and method for silt-containing production wastewater. The treatment system comprises a settling pond, a liquid outlet is formed in the side face of the settling pond, and a guide-out opening is formed in the bottom of the settling pond; the filtering device is used for filtering the lower-layer mixture from the leading-out opening and comprises a supporting rod, a connecting ring and a plurality of filter cartridges; for any filter cartridge, the filter cartridge comprises a bracket, an upper support ring, a lower support ring and a filter piece; the upper supporting ring and the lower supporting ring are fixedly connected to the support, the filtering piece is installed between the upper supporting ring and the lower supporting ring, and an opening and closing assembly is arranged at the bottom of the lower supporting ring; the supports are fixedly connected to the connecting ring, and the connecting ring is rotationally connected with the supporting rod. And the cake pressing device is used for pressing the filter residues filtered by the filtering device into mud cakes. The filtering duration of silt-containing production wastewater can be prolonged, the cleanliness of filtrate is improved, the water content of filter residues is reduced, and self-cleaning of a filtering piece is achieved.

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: 1. The treatment system and method for the mud-containing production wastewater provided by 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; 2. The treatment system and method for the mud-containing production wastewater provided by 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. 3. The treatment system and method for the mud-containing production wastewater provided by 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

[0020] The drawings described herein are intended to provide further understanding of the embodiments of the present application and constitute a part of the present application, and do not constitute a limitation of the embodiments of the present application. In the drawings: Figure 1 A perspective view of a filter device according to an embodiment of the present application; Figure 2 A perspective view of a filter device according to an embodiment of the present application; Figure 1 A partial perspective view of a filter cartridge position in the filter device according to an embodiment of the present application; Figure 3 A longitudinal sectional view of a filter device according to an embodiment of the present application; Figure 2 Figure 4 A schematic view of a push rod slidingly installed in a sliding groove of a protruding portion according to an embodiment of the present application; Figure 5 A planar development view of a protruding portion according to an embodiment of the present application; Figure 6 A perspective view of a filter cartridge in a filter device according to an embodiment of the present application; Figure 7 A top view of a filter device according to an embodiment of the present application; Figure 1 A transverse sectional view of a filter device according to an embodiment of the present application; Figure 8 A schematic view of a connecting structure of an abutting disc and a support rod according to an embodiment of the present application. Figure 9 Markings in the drawings and corresponding names of parts:

[0021] 2 - support rod; 21 - driving motor; 22 - adjusting screw; 3 - connecting ring; 31 - gear; 4 - filter cartridge; 41 - support; 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 portion; 463 - protruding head; 464 - protruding portion; 465 - scraping sheet; 466 - helical groove; 467 - abutting rod; 47 - abutting disc; 471 - protruding portion; 4711 - sliding groove; 472 - sleeve; 48 - first compression spring; 51 - sleeve ring; 52 - second compression spring; 53 - tension spring; 54 - guide groove; 55 - opening and closing plate; 551 - lever; 56 - stop block; 57 - return spring; 58 - first liquid collecting groove; 59 - second liquid collecting groove; 7 - ground. DETAILED DESCRIPTION

[0022] ​​To make the objectives, technical solutions, and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the examples and accompanying drawings. The exemplary embodiments of the present invention and their descriptions are only used to explain the present invention and are not intended to limit the present invention. It should be noted that the present invention is already in the actual development and use stage.

[0023] Mining operations, such as ore washing and dust reduction, continuously generate large quantities of silt-laden wastewater containing sediment and fine mineral powder. Discharged directly without treatment not only causes environmental problems such as surface runoff pollution, water turbidity, farmland siltation, and damage to aquatic ecosystems, but also poses serious ecological risks such as eutrophication of surrounding water bodies, waste of water resources, and groundwater infiltration contamination. Furthermore, large amounts of sediment deposition can clog drainage ditches and damage surrounding infrastructure, posing potential risks to mine safety.

[0024] To this end, the sediment portion of the sediment-containing production wastewater is usually separated to obtain relatively clear water and mud with a higher sediment content. The relatively clear water obtained by separation can be used for the ore washing step in the production process, thereby reducing the use of clean water sources 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 mud, it is usually pressed into a mud cake using filter pressing equipment such as a plate and frame filter press.

[0025] However, when using existing technologies to separate and treat silt-containing production wastewater, there are usually problems such as the filtration stage of the silt-containing production wastewater to be treated being short, resulting in a high water content in the slurry obtained by filtration separation, and the filter components of the separation and filtration equipment needing to be shut down for cleaning (such as the Chinese patent CN202510787386.3 discloses a pond bottom sludge separation and treatment equipment based on aquaculture. Although it uses a combination of electromagnetic adsorption and automatic transmission to achieve rapid separation, efficient cleaning and precise resetting of the seepage mechanism, thereby solving the problem that the filter components of the existing equipment need to be manually disassembled and cleaned after being clogged, resulting in treatment interruption and low efficiency, it still needs to interrupt the filtration separation process).

[0026] To this end, the present invention provides a system and method for treating silt-containing production wastewater, which can efficiently separate and filter silt-containing production wastewater while increasing the filtration time of the silt-containing production wastewater to be treated, improving the purity of the filtrate, reducing the water content of the filter residue, and realizing self-cleaning of the filter element.

[0027] Example 1: like Figure 1 As shown, the treatment system for silt-containing production wastewater includes: A sedimentation tank, wherein a liquid outlet is provided on the side of the sedimentation tank and a guide outlet is provided at the bottom of the sedimentation tank; The filtering device is used for filtering the lower mixture from the guide outlet, and comprises a supporting 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 41, an upper supporting ring 42, a lower supporting ring 43 and a filter element 44; the upper supporting ring 42 and the lower supporting ring 43 are fixedly connected to the support 41, and the filter element 44 is installed between the upper supporting ring 42 and the lower supporting ring 43, and an opening and closing assembly is arranged at the bottom of the lower supporting ring 43; each support 41 is fixedly connected to the connecting ring 3, and the connecting ring 3 is rotationally connected to the supporting rod 2. The cake pressing device is used for pressing the filter residue filtered by the filtering device into a mud cake.

[0028] Preferably, the liquid outlet is a plurality of liquid outlets, and at least one liquid outlet exists at any height position of the sedimentation tank.

[0029] 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 should be noted 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 the upper liquid can be discharged through the appropriate liquid outlet 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.

[0030] Preferably, the filter cartridges 4 are uniformly distributed along the circumference of the connecting ring 3, a guide groove 54 is arranged between any two adjacent filter cartridges 4, and the two ends of the guide groove 54 are connected to the upper side of an upper supporting ring 42; each guide groove 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 height of the groove bottom of the guide groove 54 gradually increases or gradually increases and then gradually decreases (in the embodiment 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 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.

[0031] 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.

[0032] 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. 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. 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.

[0033] 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 discharge the residue 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.

[0034] Preferably, as shown in Figure 1 to Figure 3 and Figure 6 to Figure 7 The first liquid collecting groove 58 is fixedly connected to the lower support ring 43, and the filter device further comprises a second liquid collecting groove 59, and each first liquid collecting groove 58 is connected to the second liquid collecting groove 59. In vertical projection, the projection outline of the filter element 44 is located outside the projection outline of the second liquid collecting tank 59 .

[0035] Thus, this embodiment securely mounts first sump 58 on lower support ring 43 to receive filtrate from filter cartridge 4. Connecting each first sump 58 to second sump 59 facilitates extraction of filtrate for reuse in production. The projected contour of filter element 44 lies outside the projected contour of second sump 59, preventing filter residue from filter cartridge 4 from entering second sump 59 and effectively isolating the filtrate from the residue.

[0036] Preferably, a stirring motor and stirring blades are further provided in the sedimentation tank. The stirring blades are located at the bottom of the sedimentation tank and rotated by the stirring motor. It should be understood that the stirring motor is fixedly mounted above the sedimentation tank, and the stirring blades are used to disturb the lower layer mixture during the process of draining the lower layer mixture to make it homogenous.

[0037] In this way, the same batch of lower layer mixture can enter the filter cartridge 4 more evenly, ensuring that the filtration process of the filtration device is carried out stably (if it is uneven, the lower layer mixture in a certain filter cartridge 4 is too thin, which will make it difficult to filter out the excess water, and then there will be too much residual water in the discharged filter residue).

[0038] It should be understood that the cake pressing device is a mature existing product used to press the filter residue obtained by the filter device into a mud cake, such as the aforementioned plate and frame filter press, and will not be described in detail in this application. Preferably, a receiving hopper or conveyor belt (not shown) for receiving the filter residue is provided in the section below the elevation of the opening and closing plate 55 between the position of the stop block 56 and the injection position, thereby facilitating the input of the filter residue into the cake pressing device.

[0039] Accordingly, the treatment system for silt-containing production wastewater provided in this embodiment performs preliminary sedimentation treatment on the silt-containing production wastewater to be treated through a sedimentation tank, thereby obtaining preliminary concentrated silt-containing production wastewater (i.e., the lower layer mixture in the sedimentation tank), thereby reducing the processing capacity of the filtering device; by fixedly installing multiple filter cartridges 4 on the connecting ring 3, and rotatably connecting the connecting ring 3 and the fixed support rod 2 (for example, the support rod 2 is fixedly installed on the ground 7), a multi-station filtering device is formed to achieve further concentration of the lower layer mixture (i.e., filter residue), thereby reducing the processing capacity of the cake pressing device; the filtering device filters the lower layer mixture, so that the water content of the filter residue entering the cake pressing device is lower, which can make the water content of the mud cake obtained by pressing it lower, thereby making it more convenient to transport, stack, etc.

[0040] Example 2: like Figure 1 to Figure 3 As shown, this embodiment is based on embodiment 1, except that, in this embodiment: 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 slides relative to the constraint ring 45 in a direction 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, 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. The filter device further comprises an extension and retraction mechanism capable of driving the push rod 46 to reciprocate along the axial direction of the filter cartridge 4.

[0041] Therefore, in the filter device provided in the embodiment, after any filter cartridge 4 receives the lower layer mixture, the push rod 46 is driven to be pressed downward by the extension and retraction mechanism, 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. During the pressing process of the push rod 46, 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, achieving self-cleaning of the filter element 44, and thereby ensuring the filtering effect of the filter element 44 during the next filtration operation of the filter cartridge 4.

[0042] Specifically, an abutting portion 462 is arranged at the end of the push rod 46 away from the push plate 461, and the extension and retraction mechanism comprises an abutting disc 47 and a first compression spring 48 corresponding to the push rod 46. The abutting disc 47 is installed above the support rod 2, and a protruding portion 471 is arranged on the lower end surface of the abutting disc 47. The two ends of the first compression spring 48 abut against the abutting portion 462 and the constraint ring 45, respectively, so that the abutting portion 462 abuts against the lower surface of the protruding portion 471. 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 until the push plate 461 is inserted into the filter cartridge 4, and then move upward under the action of the first compression spring 48 until the push plate 461 is pulled out of the filter cartridge 4.

[0043] Therefore, the filtering device provided in this embodiment does not require an additional power source, and the rotation of the connecting ring 3 can achieve the reciprocating motion of the push rod 46 in each filter cartridge 4 along the axial direction of the filter cartridge 4. It should be understood that the installation angle of the protrusion 471 (referring to the angle in the rotation direction of the connecting ring 3) should ensure that the protrusion 471 allows the push rod 46 to move downward to the point where the push plate 461 is inserted into the filter cartridge 4, and that the filter cartridge 4 has completed the process of receiving the lower layer mixture, and before the opening and closing plate 55 of the filter cartridge 4 is opened, the push rod 46 can move upward to the point where the push plate 461 is pulled out of the filter cartridge 4 (obviously, at this time, the height of the push plate 461 should be higher than the position where the lower layer mixture is injected).

[0044] Alternatively, as Figure 4 As shown, in another specific practice of this embodiment, the telescopic mechanism includes an abutment plate 47 installed above the support rod 2, a protrusion 471 is circumferentially provided on the lower end surface of the abutment plate 47, and an annular sliding 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 process of the filter cartridge 4 rotating 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 cartridge 4, and then move upward under the action of the slide groove 4711 and the protrusion 463 until the push plate 461 is pulled out of the filter cartridge 4.

[0045] In this practice, by utilizing the constraint of the chute 4711 on the protrusion 463, the protrusion 471 can be utilized to press down and lift up the push rod 46 during the rotation of the connecting ring 3, making the structure of the filtering device simpler.

[0046] Obviously, in order to ensure that the rising and pressing positions of the push rod 46 in each filter cartridge 4 are determined (i.e., pressed down after completing the reception of the lower layer mixture, and pulled out before the opening and closing plate 55 is opened), in this embodiment, the installation connection between the abutment plate 47 and the support rod 2 should limit the circumferential rotation between the two along the support rod 2.

[0047] Preferably, if Figure 5As shown, the raised portion 471 of the abutment plate 47 includes, in sequence, an injection section, a downward pressure section, a pressure holding section, and an upward pressure section along the circumferential direction. Apparently, for any filter cartridge 4, during the injection section, the filter cartridge 4 is in the process of receiving the lower layer of mixture, and the push rod 46 is at its upper limit position, facilitating the injection of the lower layer of mixture. During the downward pressure section, the filter cartridge 4 has completed receiving the lower layer of mixture, and the push rod 46 is gradually pressed downward. During the pressure holding section, the push rod 46 is at its lower limit position, ensuring that the lower layer of mixture within the space of the filter cartridge 4 between the push plate 461 and the opening and closing plate 55 is always squeezed, promoting further discharge of the filter residue. During the upward pressure section, the push rod 46 gradually moves upward, thereby withdrawing the push plate 461 from the filter cartridge 4, facilitating the filter cartridge 4 to receive the lower layer of mixture again. Preferably, the slope of the downward pressure section is much smaller than that of the upward pressure section. Thus, the downward pressure section can be designed to be longer (i.e., longer in circumferential length and slower downward pressure), thereby avoiding damage to the filter element 44 due to excessive downward pressure.

[0048] Example 3: like Figure 9 As shown, this embodiment is based on embodiment 2, except that, in this embodiment: The abutment plate 47 and the support rod 2 are slidably connected along the axial direction of the support rod 2, and an adjustment screw 22 is rotatably provided on the support rod 2, and the adjustment screw 22 is threadedly connected to the abutment plate 47. More specifically, a sleeve 472 extends axially from the lower end surface of the abutment plate 47, and the sleeve 472 is slidably sleeved on the support rod 2; the adjustment screw 22 is rotatably provided on the support rod 2, and the adjustment screw 22 is threadedly connected to the sleeve 472.

[0049] Therefore, in the filter device provided in this embodiment, the height position of the abutment disc 47 can be adjusted by rotating the adjustment screw 22, thereby adjusting the lower limit position of the push plate 461 after being pressed down. In the case where the lower layer of the injected mixture contains a low amount of sediment, the abutment disc 47 can be lowered, thereby forcing the push plate 461 to be pressed down to a sufficiently low level to ensure the pressure after the downward pressure, thereby achieving the purpose of reducing the moisture content of the filter residue; correspondingly, in the case where the lower layer of the injected mixture contains a high amount of sediment, the abutment disc 47 can be raised, thereby preventing the push plate 461 from being pressed down too much, resulting in excessive pressure and damage to the filter element 44.

[0050] Example 4: like Figure 6 As shown, this embodiment is based on embodiment 2, except that, in this embodiment: A boss 464 is further provided on the lower surface of the push plate 461. A plurality of scrapers 465 are mounted on the peripheral wall of the boss 464. When the push plate 461 is inserted into the filter cartridge 4, the ends of the scrapers 465 away from the boss 464 abut against the inner wall of the filter element 44. A helical groove 466 is formed 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, and the sliding pin is inserted into the helical groove 466 (the sliding pin is not shown in the figure).

[0051] It should be understood that the helix angle of the helical groove 466 should be large enough to ensure that the sliding pin and the helical 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 of using the sliding groove 4711 to constrain the protrusion 463 to realize the pressing and lifting of the push rod 46, 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 silt-containing production wastewater treatment system provided in the present embodiment, the push rod 46 can move linearly along the axis of the filter cylinder 4 in a reciprocating manner, the circumferential wall of the push plate 461 can scrape the inner side wall of the filter element 44 along the axis of the filter cylinder 4, and the scraping piece 465 can scrape the inner side wall of the filter element 44 along the circumference of the filter cylinder 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.

[0052] It is worth noting that although the above-mentioned self-cleaning effect only occurs on the inner side wall of the filter element 44 and cannot clean the pores of the filter element 44; but since the push rod 46 can be moved upward to pull out the push plate 461 from the filter cylinder 4 before the opening of the opening and closing plate 55 of the filter cylinder 4, and the process of moving the push rod 46 upward to pull out the push plate 461 from the filter cylinder 4 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 thereby using the negative pressure suction effect to clean the pores of the filter element 44 through airflow flushing, so as to achieve the purpose of sucking some silt that has invaded the pores back into the filter cylinder 4. For the protrusion 471, a larger slope of the upward movement section of the push rod 46 to pull out the push plate 461 from the filter cylinder 4 can save the time required to pull out the push rod 46 (i.e., extend the time for the push rod 46 to be pressed downward), and the larger slope of the upward movement section can also make the negative pressure suction effect stronger.

[0053] Embodiment 5: The present embodiment is based on Embodiment 2, and the difference lies in that in the present embodiment: The filter element 44 is a flexible filter bag, and a rigid mesh plate is arranged outside the filter element 44. The rigid mesh plate is fixedly connected with the upper support ring 42 and / or the lower support ring 43, and covers the outer side of the flexible filter bag.

[0054] Therefore, this embodiment adopts a flexible filter bag as the filter element 44, which can improve the purity of the filtrate and facilitate the reuse of the filtrate in the production stage; by covering the outside of the flexible filter bag with a rigid mesh plate, the push rod 46 can be inserted into the filter cartridge 4 for pressurized filtration, and the push plate 461 can always abut against the inner side of the flexible filter bag (the outer side of the flexible filter bag is constrained by the rigid mesh plate), ensuring effective pressure on the lower layer mixture below.

[0055] Better, if 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 further slidably installed along the axial direction of the filter cartridge 4 between the upper support ring 42 and the lower support ring 43, and the inner wall of the collar 51 abuts against the outer wall of the flexible filter bag; The push rod 46 is connected to an abutting rod 467. When the push rod 46 is inserted into the filter cartridge 4, the abutting rod 467 can abut against the upper end surface 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 .

[0056] It should be understood that in this embodiment, the axial sliding travel of the collar 51 along the filter cartridge 4 is limited between the upper support ring 42 and the lower support ring 43. Therefore, in this practice, the collar 51 is sleeved around the flexible filter bag, and the collar 51 is pushed downward synchronously with the push plate 461 by the abutting rod 467 during the downward pressure of the push rod 46 (which occurs after the push plate 461 enters the filter cartridge 4). The collar 51 then constrains the flexible filter bag located at the peripheral wall of the push plate 461, ensuring that the push plate 461 always abuts the inner side of the flexible filter bag, ensuring effective pressure on the lower layer of mixture. Furthermore, the flexible filter bag below the collar 51 bulges outward under the pressure of the push plate 461 on the lower layer of mixture, forming a bend at the lower edge of the collar 51. Consequently, the sediment adhered to the inner wall of the flexible filter bag at this location is loosened by the bending action of the flexible filter bag, thereby facilitating its removal during the downward pressure of the push plate 461.

[0057] Example 6: This embodiment provides a method for treating silt-containing production wastewater. The method is based on the aforementioned treatment system and includes: S1, transporting the sediment-containing wastewater to be treated to a sedimentation tank and allowing it to stand for a first preset time; S2, returning the upper layer liquid obtained after standing to the production stage for reuse, and transporting the lower layer mixture to the filtration device for filtration; S3, the filtered filtrate is returned to the production stage for reuse, and the filter residue is transported to the cake pressing device to be pressed into a mud cake.

[0058] Preferably, the step of delivering the to-be-treated sediment-containing production wastewater to the sedimentation tank for standing for the first preset time duration further comprises adding a flocculating agent into the to-be-treated sediment-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 sediment in the sediment-containing production wastewater.

[0059] The embodiment provides a treatment method for sediment-containing production wastewater, which is suitable for treating sediment-containing production wastewater containing sediment and fine-particle ore powder generated in a production process such as ore washing and dust reduction in mining operations, and can separate the sediment in the sediment-containing production wastewater and press the sediment into a sediment cake, thereby facilitating storage, transportation and reuse, and also separates most of the water in the sediment-containing production wastewater for reuse in the production stage, thereby achieving the purpose of water saving.

[0060] 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 setting 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 sleeve arrangement" mean that only relative sliding can occur between the two, for example, dovetail grooves, T-shaped grooves and the like.

[0061] The above detailed description of the specific embodiments further describes the purposes, 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, and any modification, equivalent replacement, improvement and the like made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A system for treating industrial wastewater containing sediment, characterized in that: include: A sedimentation tank, wherein a liquid outlet is provided on the side of the sedimentation tank and a guide outlet is provided at the bottom of the sedimentation tank; A filtering device for filtering the lower layer mixture from the outlet, the filtering 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 supporting ring (42), a lower supporting ring (43) and a filter element (44); the upper supporting ring (42) and the lower supporting ring (43) are both fixedly connected to the bracket (41), the filter element (44) is installed between the upper supporting ring (42) and the lower supporting ring (43), and an opening and closing assembly is provided at the bottom of the lower supporting 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 filtering device into a mud cake.

2. The processing system according to claim 1, wherein: The filter cartridge (4) further comprises a restraining ring (45) and a push rod (46); the restraining 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 restraining ring (45) and the relative sliding direction of the two is parallel to the axial direction of the filter cartridge (4); A push plate (461) is fixedly mounted on 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); The filtering device further comprises a telescopic mechanism capable of driving the push rod (46) to reciprocate along the axis of the filter cartridge (4).

3. The processing system according to claim 2, characterized in that An abutment portion (462) is provided at one end of the push rod (46) away from the push plate (461), and the telescopic mechanism includes an abutment plate (47) and a first compression spring (48) corresponding one-to-one to the push rod (46); The abutment disk (47) is installed above the support rod (2), and a protrusion (471) is circumferentially provided on the lower end surface of the abutment disk (47); The two ends of the first compression spring (48) respectively abut against the abutment portion (462) and the restraint ring (45), so that the abutment portion (462) abuts against the lower surface of the protruding portion (471); During the process of the filter cartridge (4) rotating 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 cartridge (4), and then move upward under the action of the first compression spring (48) until the push plate (461) is pulled out of the filter cartridge (4).

4. The processing system according to claim 2, characterized in that The telescopic mechanism comprises an abutment plate (47) mounted above the support rod (2), a convex portion (471) is circumferentially provided on the lower end surface of the abutment plate (47), and an annular sliding groove (4711) is provided on the lower surface of the convex portion (471); A convex head (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) via the convex head (463); During the process of the filter cartridge (4) rotating 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 cartridge (4), and then move upward under the action of the slide groove (4711) and the protrusion (463) until the push plate (461) is pulled out of the filter cartridge (4).

5. The processing system according to claim 2, wherein: A boss (464) is further provided on the lower surface of the push plate (461), and a plurality of scrapers (465) are mounted on the peripheral wall of the boss (464). When the push plate (461) is inserted into the filter cartridge (4), one 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 restraint ring (45), and the sliding pin is inserted into the spiral groove (466).

6. The processing system according to claim 2, wherein: The filter element (44) is a flexible filter bag, and a rigid mesh plate is sleeved 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 outside of the flexible filter bag.

7. The processing system according to claim 2, characterized in that The filter element (44) is a flexible filter bag, and a collar (51) is slidably mounted along the axial direction of the filter cartridge (4) between the upper support ring (42) and the lower support ring (43), wherein 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), and when the push rod (46) is inserted into the filter cartridge (4), the abutment rod (467) can abut against the upper end surface 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).

8. The processing system according to claim 1, wherein: The filter cartridges (4) are evenly distributed along the circumference of the connecting ring (3), and a guide groove (54) is installed between any two adjacent filter cartridges (4), and both ends of the guide groove (54) are respectively connected to the top of an upper support ring (42); each guide groove (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 groove bottom height of the guide groove (54) gradually increases or gradually increases and then gradually decreases.

9. The processing system according to claim 1, wherein: The opening and closing assembly includes an opening and closing plate (55), a stopper (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 shifting rod (551) is radially extended on the opening and closing plate (55), and the shifting rod (551) and the lower support ring (43) are rotatably connected; the stopper (56) is fixed; one end of the return spring (57) is connected to the shifting rod (551), and the other end is connected to the lower support ring (43); During the process of the filter cartridge (4) rotating around the support rod (2), the stopper (56) can abut against the shifting rod (551) and cause the shifting rod (551) to rotate, thereby causing the opening and closing plate (55) to open the bottom of the lower support ring (43); and during the process of the filter cartridge (4) continuing to rotate around the support rod (2), the shifting rod (551) is disengaged from the stopper (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).

10. The processing system according to claim 1, wherein: A first liquid collecting tank (58) is fixedly connected to the lower support ring (43), and the filtering device further comprises a second liquid collecting tank (59), and each of the first liquid collecting tanks (58) is connected to the second liquid collecting tank (59); In a vertical projection, the projection outline of the filter element (44) is located outside the projection outline of the second liquid collecting tank (59).

11. The processing system according to claim 1, wherein: A stirring motor and a stirring blade are also provided in the sedimentation tank. The stirring blade is located at the lower part of the sedimentation tank and rotates under the drive of the stirring motor.

12. A method for treating silt-containing production wastewater, based on the treatment system according to any one of claims 1 to 11, characterized in that: include: S1, transporting the sediment-containing wastewater to be treated to a sedimentation tank and allowing it to stand for a first preset time; S2, returning the upper layer liquid obtained after standing to the production stage for reuse, and transporting the lower layer mixture to the filtration device for filtration; S3, the filtered filtrate is returned to the production stage for reuse, and the filter residue is transported to the cake pressing device to be pressed into a mud cake.

13. The processing method according to claim 12, characterized in that: The transporting the lower layer mixture to the filtering device for filtration includes disturbing the lower layer mixture in the sedimentation tank while transporting the lower layer mixture to the filtering device.

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