Movable compartment type slime water bypass treatment device and method

Abstract

The invention discloses a movable compartment type coal slime water bypass treatment device and method, and aims to solve the problems that in the prior art, the coal slime water treatment effect is poor, and the coal slime water cannot be installed at a specific position according to needs. The technical problem is solved through the following technical scheme that the device comprises a box body, the box body is provided with a heavy medium flocculation reaction device, and the heavy medium flocculation reaction device comprises a first-stage reaction stirring box, a second-stage reaction stirring box and a third-stage reaction stirring box which are communicated in sequence; the medicament adding device comprises a coagulant dissolving box for providing a coagulant for the first-stage reaction stirring box and a coagulant aid dissolving box for providing a coagulant aid for the second-stage reaction stirring box; the magnetic separation and purification device is communicated with the third-stage reaction stirring box; the dense medium sludge destabilizing device is used for destabilizing and dispersing a dense medium and coal slime; the heavy medium recovery device is used for recovering magnetic powder from the destabilized sludge; and the heavy medium adding device is used for adding the recovered magnetic powder into the reaction stirring box.

Description

Technical Field

[0001] The present invention relates to the technical field of coal slurry water treatment, and more particularly to a movable box-type coal slurry water bypass treatment device and method. Background Art

[0002] Mine water generated during coal mining is often accompanied by large amounts of coal slime and suspended solids. Furthermore, face flushing water also contains large amounts of solid particles such as coal slime and coal slag. This slurry water typically contains high levels of coal dust and rock dust. If the sump is located far from the working face, it will gradually settle in the roadway ditches after flowing over long distances. The fine coal dust cannot settle and eventually flows into the sump with the mine water. If the sump is located close to the working face, both large and fine coal dust particles flow into the sump. During the underground collection process of mine water, the particles can clog the underground roadway ditches and sump, causing problems such as clogging and wear.

[0003] Internationally, there is limited experience in pollution control and management of coal slurry overflows, primarily drawing on pollution control measures for municipal sewage overflows. France and Germany focus on source control, implementing comprehensive measures such as interception and treatment of municipal sewage overflows. Of Germany's 40,000 municipal sewage overflow treatment systems, 42% are equipped with sedimentation tanks, which remove suspended particulate matter at a rate of 55% to 75%. Many treatment plants are in operation worldwide. The same applies to pollution control and management of coal slurry overflows in China. Research indicates that pollution control for coal slurry overflows primarily focuses on source control and drainage system improvements, while end-of-pipe purification and intermediate emergency treatment are rarely reported. The high content of suspended particulate matter in coal slurry overflows, the large variability in concentration, and the intermittent, sudden, and random nature of their discharge complicate their management.

[0004] Chinese patent publication number CN110550781B, published on January 30, 2024, is titled "A Self-Cleaning Coal Slurry Water Separation and Treatment Device." The application discloses a coal slurry water treatment device comprising a separation device, a settling tank, and a recovery tank. The recovery tank is seamlessly bolted to the top of the separation device, and a settling tank is provided at one end of the recovery tank, positioned near the input end of the separation device. However, the device suffers from poor treatment efficiency when treating coal slurry water and cannot be transported or moved as needed, requiring installation in a fixed location. Summary of the Invention

[0005] The present invention overcomes the problems in the prior art of poor coal slime water treatment effect and inability to be installed at a specific position as needed, and provides a movable box-type coal slime water bypass treatment device, which can be moved to a specific position as needed, and can significantly remove suspended matter in the coal slime water, significantly improve the mud-water separation effect, and significantly reduce the water content of the coal slime discharged from the system, which is convenient for subsequent coal slime dehydration treatment.

[0006] In order to solve the above technical problems, the present invention adopts the following technical solution: a movable box-type coal slurry water bypass treatment device, including a box body, which is provided with: The heavy medium flocculation reaction device comprises a primary reaction stirring tank, a secondary reaction stirring tank and a tertiary reaction stirring tank which are connected in sequence; The reagent dosing device includes a coagulant dissolving tank for providing coagulant to the primary reaction stirring tank and a coagulant aid dissolving tank for providing coagulant aid to the secondary reaction stirring tank; A magnetic separation purification device is connected to the three-stage reaction stirring tank; Heavy medium sludge destabilization device to achieve destabilization and dispersion of heavy medium and coal slime; Heavy medium recovery device to recover magnetic powder from destabilized sludge; The heavy medium dosing device feeds the recovered magnetic powder into the reaction stirring box.

[0007] When the present application is in use, the coal sludge water to be treated flows into the heavy medium flocculation reaction device; the coal sludge water after passing through the heavy medium flocculation reaction device flows into the separation tank of the magnetic separation purification device, the magnetic disk sludge water flow in the separation tank rotates, the magnetic disk adsorbs the heavy medium sludge, which is scraped off by the scraper and then collected into the sludge storage tank; the heavy medium sludge in the sludge storage tank enters the heavy medium sludge destabilization device to achieve destabilization and dispersion of the heavy medium and coal slime; the sludge after destabilization and dispersion enters the heavy medium recovery device, the magnetic drum rotates in the opposite direction of the sludge, and the magnetic powder heavy medium adsorbed by the magnetic drum passes through the magnetic powder scraper and flows into the heavy medium dosing device.

[0008] Compared to existing technologies, this application utilizes a box-type design, allowing for integrated hoisting, transport, and placement. It can be quickly connected to internal outlet pipes, facilitating bypass connections in emergency situations and enabling rapid skid-mounting and placement of emergency treatment systems at temporary locations. The design of the various devices within the box features flow modularization and automated control, enabling the combination of different process flow rates and one-touch start / stop functionality in emergency situations.

[0009] The heavy medium sludge destabilization unit efficiently destabilizes and disperses the heavy medium at high speed, while simultaneously lifting and conveying the dispersed sludge to the subsequent heavy medium recovery unit. Compared to traditional technologies, it also recycles heavy medium magnetic powder, saving operating reagent costs. The heavy medium can be recycled (recovery rate >98%), reducing operating costs. The flocs formed during the flocculation reaction are highly dense, improving mud-water separation by 25-35%. The moisture content of the coal sludge discharged from the system is <90%, facilitating subsequent dewatering.

[0010] Preferably, the coagulant dissolution tank and the coagulant aid dissolution tank both include a reagent motor bracket, a reagent stirring motor is provided on the reagent motor bracket, and a reagent stirring paddle is provided on the output shaft of the reagent stirring motor.

[0011] The coagulant dissolving tank and the coagulant aid dissolving tank are respectively used to configure the coagulant and coagulant aid in their respective dissolving tanks through their respective reagent stirring paddles.

[0012] Preferably, the first-stage reaction stirring box, the second-stage reaction stirring box and the third-stage reaction stirring box are all provided with a flocculation motor bracket, the flocculation motor bracket is provided with a flocculation stirring motor, and the output shaft of the flocculation stirring motor is provided with a flocculation stirring paddle.

[0013] The coal slurry flows through a series of reaction and mixing tanks. The first-stage reaction and mixing tank mixes the coal slurry, coagulant, and heavy medium, forming flocs with the heavy medium as the "nucleus." The second-stage reaction and mixing tank mixes and contacts the coagulant aid with the heavy medium flocs. The third-stage reaction and mixing tank achieves adsorption bridging and netting and sweeping between the heavy medium flocs, forming dense flocs that encapsulate the heavy medium.

[0014] Preferably, the magnetic separation purification device includes a magnetic separation tank, a magnetic disk partially immersed in the magnetic separation tank, and a scraper for scraping off the mud residue adsorbed on the magnetic disk.

[0015] The magnetic disks rotate against the water flow. Changing the disk speed adjusts the duration of the magnetic field between the disks and the heavy medium flocs or particulate impurities, achieving rapid separation of these impurities under the action of the magnetic field. Clean water is discharged from the separation tank outlet pipe, and the heavy medium sludge formed by the heavy medium flocs or particulate impurities absorbed by the magnetic disks is scraped off by the scraper and collected in the sludge storage tank.

[0016] Preferably, the heavy medium coal slime destabilization device includes a destabilization motor bracket, a high-speed dispersing and stirring motor arranged on the destabilization motor bracket, and a high-speed dispersing and stirring paddle connected to the output shaft of the high-speed dispersing and stirring motor.

[0017] The heavy medium sludge in the sludge storage tank flows into the destabilization box by gravity. After being stirred at high speed by the high-speed dispersing impeller, the sludge wrapped around the magnetic powder is destabilized and dispersed, creating conditions for the subsequent separation of magnetic powder and coal slime and the recovery of magnetic powder.

[0018] Preferably, the heavy medium recovery device includes a destabilized sludge collection tank, a magnetic drum partially immersed in the destabilized sludge collection tank, and a magnetic powder scraper for scraping magnetic powder on the magnetic drum; a coal slime outlet pipe is provided at the bottom of the destabilized sludge collection tank.

[0019] A gap is created between the bottom of the magnetic drum and the bottom of the destabilized sludge collector. The magnetic drum rotates countercurrently. Changing the drum's speed adjusts the contact time between the magnetic field and the dispersed sludge, enabling the magnetic powder heavy medium to rapidly attract the coal sludge under the action of a strong magnetic field. The coal sludge is discharged from the system through the coal sludge outlet pipe. The magnetic powder heavy medium attracted by the magnetic drum is scraped off by a magnetic powder scraper and recycled into the magnetic powder mixing tank.

[0020] Preferably, the heavy medium dosing device includes a magnetic powder stirring box, a heavy medium stirring paddle arranged in the magnetic powder stirring box, and a heavy medium dosing pump that delivers the heavy medium in the magnetic powder stirring box to the primary reaction stirring box.

[0021] The heavy medium dosing pump re-feeds the heavy medium magnetic powder in the magnetic powder mixing tank into the primary reaction mixing tank to achieve the recycling of the heavy medium magnetic powder.

[0022] Preferably, it further comprises an emptying main pipe, on which a plurality of emptying branch pipes are provided, and the emptying branch pipes are connected to the corresponding stirring boxes and reaction tanks.

[0023] It is convenient to empty the mud and other impurities in the box and to clean the entire equipment.

[0024] The present application also provides a movable chamber-type coal slurry water bypass treatment method, comprising the above-mentioned movable chamber-type coal slurry water bypass treatment device, and further comprising the following steps: (1) The coal slurry to be treated flows into the heavy medium flocculation reaction device; (2) The coal slurry water after passing through the heavy medium flocculation reaction device flows into the separation tank of the magnetic separation purification device. The magnetic disk in the separation tank rotates, and the heavy medium sludge adsorbed by the magnetic disk is scraped off by the scraper and collected into the sludge storage tank; (3) The heavy medium sludge in the sludge storage tank enters the heavy medium sludge destabilization device to achieve destabilization and dispersion of the heavy medium and coal slime; (4) The destabilized and dispersed sludge enters the heavy medium recovery device. The magnetic drum rotates in the opposite direction of the sludge. The magnetic powder heavy medium adsorbed by the magnetic drum passes through the magnetic powder scraper and flows into the heavy medium dosing device.

[0025] The above-mentioned method significantly removes suspended particulate matter (SS), a portion of chemical oxygen demand (COD), and a portion of color from overflow coal sludge water, increasing SS, COD, and TP removal rates by 50-60%, 15-20%, and 60-70%, respectively, compared to traditional coagulation technologies. The heavy media can also be recycled (recovery rate >98%), reducing operating costs. The flocs formed during the flocculation reaction are highly dense, improving sludge-water separation by 25-35%. The moisture content of the coal sludge discharged from the system is less than 90%, facilitating subsequent dehydration.

[0026] Preferably, in the coagulant dissolution tank, the coagulant is a polyaluminum chloride solution with a preparation concentration of 13%~18%, and the designed average dosage is 20~30 mg / L relative to the volume of the coal slurry water; in the coagulant dissolution tank, the coagulant is a polyacrylamide solution with a preparation concentration of 0.1~0.3%, and the designed average dosage is 1.8~2.3 mg / L.

[0027] Within the above-mentioned agent concentration range, the flocculation effect can be significantly improved.

[0028] Compared with the prior art, the present invention has the following beneficial effects: (1) The present invention can significantly remove suspended particulate matter (SS), part of chemical oxygen demand (COD) and part of chromaticity in overflow coal slime water, and the removal rates of SS, COD and TP are increased by 50-60%, 15-20% and 60-70% respectively compared with traditional coagulation technology.

[0029] (2) The present invention can recycle and reuse the heavy medium (recovery rate > 98%), reducing operating costs. The flocs formed during the flocculation reaction have high density, improving the mud-water separation effect by 25-35%. The moisture content of the coal sludge discharged from the system is < 90%, facilitating subsequent coal sludge dehydration treatment.

[0030] (3) The magnetic separation purification device of the present invention adopts an encrypted disk design to improve the flow state between the disk and the shell, optimize the magnetic field intensity distribution, exert the field intensity superposition effect, and improve the magnetic separation efficiency, which is 40~45% higher than the conventional precipitation method.

[0031] (4) The heavy medium sludge destabilization device of the present invention efficiently destabilizes and disperses the heavy medium at high speed, while simultaneously lifting and transporting the dispersed sludge to the subsequent heavy medium recovery device. Compared with traditional technologies, it has the function of recycling and reusing heavy medium magnetic powder, which can save operating reagent costs.

[0032] (5) The heavy medium dosing device of the present invention is designed to use a pneumatic diaphragm pump with air source provided by a mobile air compressor, which avoids blockage and wear (the traditional hose pump is prone to blockage of heavy medium and wear of hose when it is stopped for a long time), which can reduce the operation and maintenance workload.

[0033] (6) The present invention adopts a box-type design, which can be hoisted, transported and put into place as a whole. It can realize quick movable connection with the internal outlet pipe, which is convenient for bypass connection in emergency situations and realizes rapid skid installation and placement of emergency treatment at temporary locations. The design of each device inside the box has the characteristics of flow modularization and control automation, which can realize the combination design of different treatment flow rates and the one-button start and stop function in emergency situations. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a top view of the present invention.

[0035] Figure 2 yes Figure 1 Cross-sectional view in the AA direction.

[0036] Figure 3 yes Figure 1 Cross-sectional view along the BB direction.

[0037] Figure 4 This is a front view of a magnetic separation and purification device in Example 2 of the present invention.

[0038] Figure 5 It is a top view of the magnetic separation and purification device in Example 2 of the present invention.

[0039] Figure 6 yes Figure 5 A partial enlarged view of the middle C area.

[0040] In the figure: 1. Chemical dosing device, 11. Tap water inlet pipe, 12. Chemical stirring motor, 13. Chemical motor bracket, 14. Chemical stirring paddle, 15. Coagulant dosing pipeline, 151. Coagulant dosing metering pump, 152. Coagulant filter, 16. Coagulant dosing pipeline, 161. Coagulant dosing metering pump, 162. Coagulant filter; 2. Heavy medium flocculation reaction unit, 21. Coal slurry water inlet pipe, 221. First-stage flocculation motor bracket, 222. First-stage flocculation stirring motor, 223. First-stage flocculation stirring paddle, 231. Second-stage flocculation motor bracket, 232. Second-stage flocculation stirring motor, 233. Second-stage flocculation stirring paddle, 241. Third-stage flocculation motor bracket, 242. Third-stage flocculation stirring motor, 243. Third-stage flocculation stirring paddle, 25. Water outlet of heavy medium flocculation reaction unit; 3. Magnetic separation purification device, 31. Magnetic separation water inlet, 32. Magnetic separation tank, 33. Magnetic disk, 34. Magnetic disk rotating shaft, 35. Scraper plate, 351. Scraper blade, 352. Scraper end plate, 36. Sludge storage tank, 37. Separation tank outlet pipe, 38. Clean water outlet, 39. Heavy medium sludge conveying pipe, 310. Magnetic disk rotating motor, 311. Magnetic disk rotating reducer; 4. Destabilization box, 41. High-speed dispersing and stirring motor, 42. Destabilization motor, 43. High-speed dispersing and stirring paddle, 44. Dispersing sludge conveying pipe; 5. Heavy medium recovery device; 51. Destabilized sludge collector; 52. Magnetic drum shaft; 53. Magnetic drum; 54. Magnetic powder scraper; 55. Coal slime outlet; 56. Magnetic drum rotation motor; 6. Magnetic powder mixing box; 61. Heavy medium stirring motor; 62. Heavy medium stirring paddle; 63. Heavy medium suction hose; 64. Hose fixing sleeve; 65. Heavy medium dosing pump; 66. Heavy medium dosing pipeline; 67. Mobile air compressor, 7. Box, 71. Electrical automatic control device; 8. Empty the pipe, 81. Empty the branch pipe; 9. Rotating shaft mounting bracket, 91. Spring, 92. Vibration lever, 93. Vibration slot, 94. Elastic block. DETAILED DESCRIPTION

[0041] The technical solution of the present invention is further described in detail below through specific embodiments and in conjunction with the accompanying drawings: Example 1: Reference Figures 1 to 3 As shown, a movable box-type coal slurry water bypass treatment device includes a box body 7, which is provided with: The heavy medium flocculation reaction device 2 comprises a primary reaction stirring tank F, a secondary reaction stirring tank D and a tertiary reaction stirring tank E which are connected in sequence; The reagent dosing device 1 includes a coagulant dissolving tank G for providing a coagulant to the primary reaction stirring tank and a coagulant aid dissolving tank H for providing a coagulant aid to the secondary reaction stirring tank; The magnetic separation and purification device 3 is connected to the three-stage reaction stirring box; Heavy medium sludge destabilization device to achieve destabilization and dispersion of heavy medium and coal slime; Heavy medium recovery device 5, recovering magnetic powder from destabilized sludge; The heavy medium dosing device feeds the recovered magnetic powder into the reaction stirring box.

[0042] It also includes an electrical automatic control device 71 to implement the automatic control function of the present invention.

[0043] In one embodiment, the coagulant dissolution tank and the coagulant aid dissolution tank both include a reagent motor bracket 13, on which a reagent stirring motor 12 is mounted, and an output shaft of the reagent stirring motor is provided with a reagent stirring paddle 14. The reagent motor bracket is provided above the coagulant dissolution tank and the coagulant aid dissolution tank, and the motor shaft of the reagent stirring motor is provided in a vertical direction.

[0044] The coagulant dissolving tank and the coagulant aid dissolving tank are respectively used to configure the coagulant and coagulant aid in their respective dissolving tanks through their respective reagent stirring paddles. The coagulant dissolving tank and the coagulant aid stirring tank are also provided with a water inlet pipe 11.

[0045] A coagulant dosing line 16 is installed within the coagulant dissolution tank. One end of the coagulant dosing line is connected to the coagulant dissolution tank, and the other end is connected to the primary reaction mixing tank. A coagulant dosing pump 161 is installed within the coagulant dosing line. This pump precisely controls the amount of coagulant added to the primary reaction mixing tank. Before entering the coagulant dosing line, the coagulant in the coagulant dissolution tank is filtered through a coagulant filter 162.

[0046] The coagulant dissolution tank is equipped with a coagulant dosing line 15, one end of which is connected to the coagulant dissolution tank and the other end to the secondary reaction mixing tank. A coagulant dosing pump 151 is installed on the coagulant dosing line. This pump precisely controls the amount of coagulant added to the secondary reaction mixing tank. The coagulant in the coagulant dissolution tank is filtered through a coagulant filter 152 before entering the coagulant dosing line.

[0047] In this application, in the coagulant dissolution tank, the coagulant is a polyaluminum chloride (PAC) solution with a preparation concentration of 15%, and the designed average dosage is 25 mg / L; in the coagulant dissolution tank, the coagulant is a polyacrylamide (PAM) solution with a preparation concentration of 0.2%, and the designed average dosage is 2.0 mg / L.

[0048] In one embodiment, a flocculation motor bracket is provided in each of the first-stage reaction stirring box, the second-stage reaction stirring box and the third-stage reaction stirring box. A flocculation stirring motor is provided on the flocculation motor bracket. A flocculation stirring paddle is provided on the output shaft of the flocculation stirring motor.

[0049] For easier description, a primary flocculation motor bracket 221 is provided on the top of the primary reaction stirring tank, a primary flocculation stirring motor 222 is provided on the primary flocculation stirring motor bracket, and a primary flocculation stirring paddle 223 is provided on the output shaft of the primary flocculation stirring motor. A coal slurry water inlet pipe 21 communicating with the outside is provided in the primary reaction stirring tank.

[0050] A secondary flocculation motor bracket 231 is provided on the top of the secondary reaction stirring box, a secondary flocculation stirring motor 232 is provided on the secondary flocculation motor bracket, and a secondary flocculation stirring paddle 233 is provided on the output shaft of the secondary flocculation stirring motor.

[0051] A three-stage flocculation motor bracket 241 is provided on the top of the three-stage reaction stirring box, a three-stage flocculation stirring motor 242 is provided on the three-stage flocculation motor bracket, and a three-stage flocculation stirring paddle 243 is provided on the output shaft of the three-stage flocculation stirring motor.

[0052] The coal slurry flows through a series of reaction and mixing tanks. The first-stage reaction and mixing tank mixes the coal slurry, coagulant, and heavy medium, forming flocs with the heavy medium as the "nucleus." The second-stage reaction and mixing tank mixes and contacts the coagulant aid with the heavy medium flocs. The third-stage reaction and mixing tank achieves adsorption bridging and netting and sweeping between the heavy medium flocs, forming dense flocs that encapsulate the heavy medium.

[0053] In this application, the heavy medium added to the primary reaction stirring device is magnetic powder (Fe2O3 content>95%, particle size<45μm accounts for 80%, true density ≥4.6t / m3), the preparation concentration is 10%, and the designed average dosage is 250mg / L.

[0054] To improve the flocculation effect, the speeds of the corresponding reaction stirring boxes in this application are different. Specifically, the first-stage flocculation stirring motor speed n1 = 230-250 r / min, G1 = 1100-1200 s-1, T1 = 25-30 s; the second-stage flocculation stirring motor speed n2 = 190-200 r / min, G2 = 550-700 s-1, T2 = 110-120 s; the third-stage flocculation stirring motor speed n3 = 50-60 r / min, G2 = 400-450 s-1, T2 = 50-80 s.

[0055] In one embodiment, the magnetic separation purification device includes a magnetic separation tank 32, a magnetic disk 33 partially immersed in the magnetic separation tank, and a scraper 35 for scraping off the mud residue adsorbed on the magnetic disk.

[0056] Specifically, a dense medium flocculation outlet 25 is provided within the tertiary reaction mixing chamber, and a separation tank inlet 31 is provided on the magnetic separation tank. The dense medium flocculation outlet and the separation tank inlet are connected by a pipe. Coal slurry after reaction in the dense medium flocculation reaction unit flows into the magnetic separation tank through the separation tank inlet.

[0057] The magnetic separation tank is equipped with a magnetic disk shaft, which is mounted on a magnetic disk. The magnetic disk shaft 34 is connected to the output shaft of a magnetic disk motor 310 via a magnetic disk reducer 311. This allows the magnetic disk motor to rotate the shaft, which in turn drives the magnetic disks. The separation tank water inlet and scraper blades are located on either side of the magnetic disk shaft. As shown in the figure, the scraper blades and the separation tank water inlet are located on the left and right sides of the magnetic disk shaft, respectively, and the magnetic disks rotate counterclockwise. A separation tank outlet pipe 37 is connected to the side wall of the magnetic separation tank. This outlet pipe discharges the clean water separated from the magnetic separation tank. A clean water outlet 38 is located at the end of the outlet pipe.

[0058] The magnetic disks in this application are six in total. These six circular disks are 40 mm thick and 600 mm in diameter, with a center-to-center spacing of 100 mm. The magnetic field strength of the disks is 4000-4500 GS. Scrapers are positioned obliquely on either side of each disk's thickness. As the disks rotate, they scrape away the coal slime as they pass over them. The scraped coal slime flows along the scrapers into the sludge storage tank. A heavy medium sludge conveying pipe 39 is provided in the sludge storage tank 36, conveying the coal slime to the heavy medium coal slime destabilization device.

[0059] The magnetic disks rotate against the water flow. Changing the disk speed adjusts the duration of the magnetic field between the disks and the heavy medium flocs or particulate impurities, achieving rapid separation of these impurities under the action of the magnetic field. Clean water is discharged from the separation tank outlet pipe, and the heavy medium sludge formed by the heavy medium flocs or particulate impurities absorbed by the magnetic disks is scraped off by the scraper and collected in the sludge storage tank.

[0060] In one embodiment, a heavy medium coal slime destabilization device includes a destabilization tank 4, a destabilization motor bracket 42, a high-speed dispersing and stirring motor 41 mounted on the destabilization motor bracket, and a high-speed dispersing and stirring paddle 43 connected to the output shaft of the high-speed dispersing and stirring motor. The destabilization motor bracket is mounted on the top of the destabilization tank. A heavy medium sludge conveying pipe is connected to the destabilization tank. A dispersed sludge conveying pipe 44 is also mounted on the destabilization tank. The dispersed sludge conveying pipe is connected to a heavy medium recovery device.

[0061] The heavy medium sludge in the sludge storage tank flows into the destabilization box by gravity. After being stirred at high speed by the high-speed dispersing impeller, the sludge wrapped around the magnetic powder is destabilized and dispersed, creating conditions for the subsequent separation of magnetic powder and coal slime and the recovery of magnetic powder.

[0062] In one embodiment, the heavy medium recovery device 5 includes a destabilized sludge collector 51, a magnetic drum 53 partially immersed in the destabilized sludge collector, and a magnetic powder scraper 54 for scraping off magnetic powder on the magnetic drum; a coal slime outlet pipe 55 is provided at the bottom of the destabilized sludge collector.

[0063] Specifically, a magnetic drum shaft 52 is located above the destabilized sludge collector, with the magnetic drum mounted on it. This shaft is connected to the output shaft of a magnetic drum motor 56, with a magnetic drum reducer located between the motor and the shaft. The magnetic drum is 600 mm long and 500 mm in diameter, with a magnetic field strength of 6,000 to 6,500 Gs.

[0064] The magnetic powder scraper and the dispersed sludge conveying pipe are respectively arranged on both sides of the magnetic drum shaft. As shown in Figure 3, the magnetic powder scraper and the dispersed sludge conveying pipe are respectively arranged on the left and right sides of the magnetic drum shaft, and the magnetic drum rotates counterclockwise.

[0065] A gap is created between the bottom of the magnetic drum and the bottom of the destabilized sludge collector. The magnetic drum rotates countercurrently. Changing the drum's speed adjusts the duration of contact between the magnetic field and the dispersed sludge, enabling the magnetic powder medium to rapidly attract the coal sludge under the strong magnetic field. The coal sludge exits the system through the coal sludge outlet pipe. Any magnetic powder medium attracted by the magnetic drum is scraped off by a magnetic powder scraper and returned to the magnetic powder mixing tank 6.

[0066] In one embodiment, the heavy medium dosing device includes a magnetic powder stirring box, a heavy medium stirring paddle 62 disposed in the magnetic powder stirring box, and a heavy medium dosing pump 65 that delivers the heavy medium in the heavy medium dosing tank to the primary reaction stirring box.

[0067] A heavy medium stirring motor 61 is provided on the top of the magnetic powder stirring box, and the output shaft of the heavy medium stirring motor is connected to the heavy medium stirring paddle. One end of the heavy medium dosing pump is connected to the heavy medium suction hose 63, and the heavy medium suction hose is connected to the magnetic powder stirring box. The other end of the heavy medium dosing pump is connected to the heavy medium dosing pipeline 66, and the heavy medium dosing pipeline is connected to the primary reaction stirring box. A hose fixing sleeve 64 for fixing the heavy medium suction hose is provided on the periphery of the heavy medium suction hose. The heavy medium dosing pump in this embodiment adopts a pneumatic diaphragm pump, and the air source is provided by a mobile air compressor 67.

[0068] The heavy medium dosing pump re-feeds the heavy medium magnetic powder in the magnetic powder mixing tank into the primary reaction mixing tank to achieve the recycling of the heavy medium magnetic powder.

[0069] In one embodiment, a main drain pipe 8 is provided with several branch drain pipes 81, which are connected to corresponding mixing tanks and reaction tanks. These branch drain pipes are respectively connected to the coagulant dissolution tank, the coagulant aid dissolution tank, the primary reaction mixing tank, the secondary reaction mixing tank, the tertiary reaction mixing tank, the destabilization tank, and the magnetic powder mixing tank, facilitating the emptying of sludge and other impurities within the tanks. Each branch drain pipe is provided with a branch valve that can independently control the opening and closing of each branch drain pipe.

[0070] Here's how this application works: (1) The coal slurry water pipeline to be treated is connected to the quick-connect pipe outside the box. The coal slurry water flows into the heavy medium flocculation reaction device and flows through the step-by-step reaction and stirring box in sequence. The first-stage reaction and stirring box realizes the mixing of coal slurry water, coagulant and heavy medium, and forms flocs with heavy medium as the "crystal nucleus". The second-stage reaction and stirring box realizes the mixed contact between the coagulant aid and the heavy medium flocs. The third-stage reaction and stirring box realizes the adsorption bridging and net capture and sweeping functions between the heavy medium flocs, and forms dense flocs wrapped around the heavy medium.

[0071] (2) After the heavy medium flocculation reaction, the coal slurry flows by gravity into the magnetic separation purification device, that is, into the magnetic separation tank. The magnetic disk rotates against the water flow. Changing the disk speed can adjust the attraction time between the magnetic field between the disks and the heavy medium flocs or particulate impurities, thereby achieving the function of rapid separation of the heavy medium flocs or particulate impurities under the action of the magnetic field force. The clean water is discharged from the outlet pipe of the separation tank, and the heavy medium sludge formed by the heavy medium flocs or particulate impurities adsorbed by the magnetic disk is scraped off by the scraper and collected in the sludge storage tank.

[0072] (3) The heavy medium sludge in the sludge storage tank flows by gravity to the destabilization box. After being stirred at high speed by the high-speed dispersing impeller, the sludge wrapped around the magnetic powder is destabilized and dispersed, creating conditions for the subsequent separation of magnetic powder from coal slime and the recovery of magnetic powder.

[0073] (4) The destabilized and dispersed sludge flows by gravity from the destabilized sludge collector to the dense medium recovery device, that is, into the gap between the magnetic drum and the destabilized sludge collector. The magnetic drum rotates countercurrently. Changing the magnetic drum speed can adjust the contact time between the magnetic field and the dispersed sludge, realizing the rapid attraction function of the magnetic powder dense medium under the action of the strong magnetic field. The coal sludge is discharged from the system through the coal sludge outlet pipe. The magnetic powder dense medium adsorbed by the magnetic drum is scraped off by the magnetic powder scraper and recovered in the magnetic powder mixing box.

[0074] (5) The heavy medium dosing pump re-feeds the heavy medium magnetic powder in the magnetic powder mixing box into the first-stage reaction mixing box to achieve the recycling of the heavy medium magnetic powder.

[0075] Compared with the prior art, this application has the following advantages: (1) The present invention can significantly remove suspended particulate matter (SS), part of chemical oxygen demand (COD) and part of chromaticity in overflow coal slime water, and the removal rates of SS, COD and TP are increased by 50-60%, 15-20% and 60-70% respectively compared with traditional coagulation technology.

[0076] (2) The present invention can recycle and reuse the heavy medium (recovery rate > 98%), reducing operating costs. The flocs formed during the flocculation reaction have high density, improving the mud-water separation effect by 25-35%. The moisture content of the coal sludge discharged from the system is < 90%, facilitating subsequent coal sludge dehydration treatment.

[0077] (3) The magnetic separation purification device of the present invention adopts an encrypted disk design to improve the flow state between the disk and the shell, optimize the magnetic field intensity distribution, exert the field intensity superposition effect, and improve the magnetic separation efficiency, which is 40~45% higher than the conventional precipitation method.

[0078] (4) The heavy medium sludge destabilization device of the present invention efficiently destabilizes and disperses the heavy medium at high speed, while simultaneously lifting and transporting the dispersed sludge to the subsequent heavy medium recovery device. Compared with traditional technologies, it has the function of recycling and reusing heavy medium magnetic powder, which can save operating reagent costs.

[0079] (5) The heavy medium dosing device of the present invention is designed to use a pneumatic diaphragm pump whose air source is provided by a mobile air compressor 67, so as to avoid blockage and wear (the heavy medium of a conventional hose pump is easily blocked and the hose is easily worn when the pump is stopped for a long time), thereby reducing the amount of operation and maintenance.

[0080] (6) The present invention adopts a box-type design, which can be hoisted, transported and put into place as a whole. It can realize quick movable connection with the internal outlet pipe, which is convenient for bypass connection in emergency situations and realizes rapid skid installation and placement of emergency treatment at temporary locations. The design of each device inside the box has the characteristics of flow modularization and control automation, which can realize the combination design of different treatment flow rates and the one-button start and stop function in emergency situations.

[0081] Example 2: Reference Figures 4 to 6 As shown, this embodiment is similar in structure to Embodiment 1, differing in that a shaft mounting bracket 9 is provided on the magnetic separation tank, and the magnetic disk shaft is mounted on the shaft mounting bracket. The scraper includes a plurality of scraper blades 351 disposed on both sides of the magnetic disk end faces, and scraper end plates 352 are provided at the ends of the scraper blades away from the magnetic disks. The scraper blades are used to scrape away coal slime from the magnetic disk end faces, while the scraper end plates are used to scrape away coal slime from the cylindrical surface outside the magnetic disks.

[0082] The scraping blades on both sides of the scraper blade width direction are rotatably connected with the rotating shaft mounting frame. Between the scraper blade and the rotating shaft mounting frame, a spring 91 is provided. The two ends of the spring are respectively abutted between the scraper blade and the rotating shaft mounting frame.

[0083] Several vibration levers 92 are provided on the end surface of the outermost disk, evenly distributed along the circumference of the outermost disk. A vibration groove 93 is provided on the scraper, with elastic blocks 94 positioned on either side of the groove, the two elastic blocks abutting each other. The elastic blocks in this application are rubber blocks.

[0084] As the magnetic disk rotates, it drives the vibrating lever. As the lever passes through the vibration slot, it first abuts between two elastic blocks. This pushes the blocks, causing the scraper to rotate downward, while the spring compresses. As the spring compresses, the force exerted by the lever on the elastic blocks increases. When the force reaches a certain level, the lever passes through the space between the two blocks. After the lever passes through, the spring pushes the scraper to rotate around the magnetic disk's axis. This process repeats with each lever passing through the vibration slot, causing the scraper to vibrate. This increases the speed at which the coal slime flows across the scraper, reduces its accumulation, and improves its efficiency.

[0085] Example 3: Reference Figures 1 to 5As shown, a movable box-type coal slurry water bypass treatment method includes the movable box-type coal slurry water bypass treatment device described in Example 1 and Example 2, and further includes the following steps: (1) The coal slurry water to be treated flows into the heavy medium flocculation reaction device; specifically, the coal slurry water pipeline to be treated is connected to the quick-connect pipe outside the box, and the coal slurry water flows into the heavy medium flocculation reaction device and flows through the step-by-step reaction stirring box in sequence. The first-stage reaction stirring box realizes the mixing of coal slurry water, coagulant and heavy medium, and forms flocs with the heavy medium as the "crystal nucleus". The second-stage reaction stirring box realizes the mixed contact between the coagulant aid and the heavy medium flocs. The third-stage reaction stirring box realizes the adsorption bridging and net capture and sweeping functions between the heavy medium flocs, and forms dense flocs wrapped with the heavy medium.

[0086] (2) The coal slurry water after the heavy medium flocculation reaction device flows into the separation tank of the magnetic separation purification device. The magnetic disks in the separation tank rotate, and the heavy medium sludge residue adsorbed by the magnetic disks is scraped off by the scraper and collected in the sludge storage tank. Specifically, the coal slurry water after the heavy medium flocculation reaction flows into the magnetic separation purification device by gravity, that is, flows into the magnetic separation tank. The magnetic disks rotate against the water flow. Changing the disk speed can adjust the attraction time between the magnetic field between the disks and the heavy medium flocs or particulate impurities, thereby realizing the rapid separation function of the heavy medium flocs or particulate impurities under the action of the magnetic field force. The clean water is discharged from the outlet pipe of the separation tank, and the heavy medium sludge residue formed by the heavy medium flocs or particulate impurities adsorbed by the magnetic disks is scraped off by the scraper and collected in the sludge storage tank.

[0087] (3) The heavy medium sludge in the sludge storage tank enters the heavy medium sludge destabilization device to achieve destabilization and dispersion of the heavy medium and coal slime; specifically, the heavy medium sludge in the sludge storage tank flows to the destabilization box by gravity, and after being stirred at high speed by the high-speed dispersing impeller, the sludge wrapped around the magnetic powder is destabilized and dispersed, creating conditions for the subsequent separation of magnetic powder and coal slime and the recovery of magnetic powder.

[0088] (4) The destabilized and dispersed sludge enters the heavy medium recovery device. The magnetic drum rotates in the opposite direction of the sludge. The magnetic powder heavy medium adsorbed by the magnetic drum flows into the heavy medium dosing device after passing through the magnetic powder scraper. The destabilized and dispersed sludge flows from the destabilized sludge collector to the heavy medium recovery device by gravity, that is, it flows into the gap between the magnetic drum and the destabilized sludge collector. The magnetic drum rotates in the opposite direction. Changing the magnetic drum speed can adjust the contact time between the magnetic field and the dispersed sludge, thereby realizing the rapid attraction function of the magnetic powder heavy medium under the action of the strong magnetic field force. The coal sludge is discharged from the system through the coal sludge outlet pipe. The magnetic powder heavy medium adsorbed by the magnetic drum is scraped off by the magnetic powder scraper and recovered in the magnetic powder mixing box. The heavy medium dosing pump re-injects the heavy medium magnetic powder in the magnetic powder mixing box into the primary reaction mixing box to realize the recycling of the heavy medium magnetic powder.

[0089] In the coagulant dissolution tank, the coagulant is a polyaluminum chloride solution with a concentration of 13%~18%. Relative to the volume of coal slurry water, the designed average dosage is 20~30 mg / L; in the coagulant dissolution tank, the coagulant is a polyacrylamide solution with a concentration of 0.1~0.3%, and the designed average dosage is 1.8~2.3 mg / L.

[0090] Preferably, the coagulant is a polyaluminium chloride (PAC) solution with a preparation concentration of 15%, and the designed average dosage is 25 mg / L; the coagulant aid is a polyacrylamide (PAM) solution with a preparation concentration of 0.2%, and the designed average dosage is 2.0 mg / L; the heavy medium agent is magnetic powder (Fe2O3 content > 95%, particle size < 45μm accounts for 80%, true density ≥4.6t / m3), with a preparation concentration of 10%, and the designed average dosage is 250 mg / L.

[0091] The heavy medium flocculation reaction device 2 is divided into three-stage reaction stirring boxes. The first-stage reaction speed n1=230~250r / min, G1=1100~1200s-1, T1=25~30s; the second-stage reaction speed n2=190~200r / min, G2=550~700s-1, T2=110~120s; the third-stage reaction speed n3=50~60r / min, G2=400~450s-1, T2=50~80s.

[0092] The above method has the following advantages: (1) The present invention can significantly remove suspended particulate matter (SS), part of chemical oxygen demand (COD) and part of chromaticity in overflow coal slime water, and the removal rates of SS, COD and TP are increased by 50-60%, 15-20% and 60-70% respectively compared with traditional coagulation technology.

[0093] (2) The present invention can recycle and reuse the heavy medium (recovery rate > 98%), reducing operating costs. The flocs formed during the flocculation reaction have high density, improving the mud-water separation effect by 25-35%. The moisture content of the coal sludge discharged from the system is < 90%, facilitating subsequent coal sludge dehydration treatment.

[0094] (3) The magnetic separation purification device of the present invention adopts an encrypted disk design to improve the flow state between the disk and the shell, optimize the magnetic field intensity distribution, exert the field intensity superposition effect, and improve the magnetic separation efficiency, which is 40~45% higher than the conventional precipitation method.

[0095] (4) The heavy medium sludge destabilization device of the present invention efficiently destabilizes and disperses the heavy medium at high speed, while simultaneously lifting and transporting the dispersed sludge to the subsequent heavy medium recovery device. Compared with traditional technologies, it has the function of recycling and reusing heavy medium magnetic powder, which can save operating reagent costs.

[0096] (5) The heavy medium dosing device of the present invention is designed to use a pneumatic diaphragm pump whose air source is provided by a mobile air compressor 67, so as to avoid blockage and wear (the heavy medium of a conventional hose pump is easily blocked and the hose is easily worn when the pump is stopped for a long time), thereby reducing the amount of operation and maintenance.

[0097] (6) The present invention adopts a box-type design, which can be hoisted, transported and put into place as a whole. It can realize quick movable connection with the internal outlet pipe, which is convenient for bypass connection in emergency situations and realizes rapid skid installation and placement of emergency treatment at temporary locations. The design of each device inside the box has the characteristics of flow modularization and control automation, which can realize the combination design of different treatment flow rates and the one-button start and stop function in emergency situations.

[0098] The above-described embodiments are only preferred solutions of the present invention and are not intended to limit the present invention in any form. Other variations and modifications are possible without exceeding the technical solutions described in the claims.

Claims

1. A movable box-type coal slurry water bypass treatment device, characterized in that: Including a box, the box is equipped with: The heavy medium flocculation reaction device comprises a primary reaction stirring tank, a secondary reaction stirring tank and a tertiary reaction stirring tank which are connected in sequence; The reagent dosing device includes a coagulant dissolving tank for providing coagulant to the primary reaction stirring tank and a coagulant aid dissolving tank for providing coagulant aid to the secondary reaction stirring tank; A magnetic separation purification device is connected to the three-stage reaction stirring tank; Heavy medium sludge destabilization device to achieve destabilization and dispersion of heavy medium and coal slime; Heavy medium recovery device to recover magnetic powder from destabilized sludge; The heavy medium dosing device feeds the recovered magnetic powder into the reaction stirring box.

2. The movable chamber type coal slurry water bypass treatment device according to claim 1 is characterized in that: The coagulant dissolution box and the coagulant aid dissolution box both include a reagent motor bracket, a reagent stirring motor is provided on the reagent motor bracket, and a reagent stirring paddle is provided on the output shaft of the reagent stirring motor.

3. The movable box-type coal slurry water bypass treatment device according to claim 1 is characterized in that: The first-stage reaction stirring box, the second-stage reaction stirring box and the third-stage reaction stirring box are all provided with flocculation motor brackets, the flocculation stirring motors are provided on the flocculation motor brackets, and the flocculation stirring paddles are provided on the output shafts of the flocculation stirring motors.

4. The movable chamber type coal slurry water bypass treatment device according to claim 1 is characterized in that: The magnetic separation purification device comprises a magnetic separation tank, a magnetic disk partially immersed in the magnetic separation tank, and a scraper for scraping off the mud residue adsorbed on the magnetic disk.

5. The movable chamber type coal slurry water bypass treatment device according to claim 1 is characterized in that: The heavy medium coal slime destabilization device comprises a destabilization motor bracket, a high-speed dispersing and stirring motor arranged on the destabilization motor bracket, and a high-speed dispersing and stirring paddle connected to the output shaft of the high-speed dispersing and stirring motor.

6. The movable chamber type coal slurry water bypass treatment device according to any one of claims 1 to 5, characterized in that: The heavy medium recovery device includes a destabilized sludge collection tank, a magnetic drum partially immersed in the destabilized sludge collection tank, and a magnetic powder scraper for scraping magnetic powder on the magnetic drum; a coal slime outlet pipe is provided at the bottom of the destabilized sludge collection tank.

7. The movable chamber type coal slurry water bypass treatment device according to any one of claims 1 to 5, characterized in that: The heavy medium dosing device comprises a magnetic powder stirring box, a heavy medium stirring paddle arranged in the magnetic powder stirring box and a heavy medium dosing pump for delivering the heavy medium in the magnetic powder stirring box to the primary reaction stirring box.

8. The movable chamber type coal slurry water bypass treatment device according to any one of claims 1 to 5, characterized in that: It also includes an emptying main pipe, on which are arranged several emptying branch pipes, which are connected with corresponding stirring boxes and reaction tanks.

9. A movable box-type coal slurry water bypass treatment method, characterized in that: The movable chamber-type coal slurry water bypass treatment device according to any one of claims 1 to 8 further comprises the following steps: (1) The coal slurry to be treated flows into the heavy medium flocculation reaction device; (2) The coal slurry water after passing through the heavy medium flocculation reaction device flows into the separation tank of the magnetic separation purification device. The magnetic disk in the separation tank rotates, and the heavy medium sludge adsorbed by the magnetic disk is scraped off by the scraper and collected into the sludge storage tank; (3) The heavy medium sludge in the sludge storage tank enters the heavy medium sludge destabilization device to achieve destabilization and dispersion of the heavy medium and coal slime; (4) The destabilized and dispersed sludge enters the heavy medium recovery device. The magnetic drum rotates in the opposite direction of the sludge. The magnetic powder heavy medium adsorbed by the magnetic drum passes through the magnetic powder scraper and flows into the heavy medium dosing device.

10. The movable chamber type coal slime water bypass treatment method according to claim 9, characterized in that: In the coagulant dissolution tank, the coagulant is a polyaluminum chloride solution with a concentration of 13%~18%. Relative to the volume of coal slurry water, the designed average dosage is 20~30 mg / L; in the coagulant dissolution tank, the coagulant is a polyacrylamide solution with a concentration of 0.1~0.3%, and the designed average dosage is 1.8~2.3 mg / L.

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