Coal washing wastewater treatment and purification equipment and process for coal washing plant

Abstract

The invention relates to the technical field of coal washing wastewater treatment and purification, and discloses coal washing wastewater treatment and purification equipment and a coal washing wastewater treatment and purification process for a coal washing plant, the coal washing wastewater treatment and purification equipment comprises an integrated shell, the integrated shell is internally provided with an adjusting tank, a coagulation reaction tank and an inclined tube precipitator in sequence, the inclined tube settler comprises a sludge hopper fixedly connected to the bottom end of the inclined tube settling pond, and a first variable-diameter assembly and a second variable-diameter assembly which are respectively mounted in the middle and at the bottom of the periphery of the sludge hopper, and the first variable-diameter assembly and the second variable-diameter assembly are arranged in the middle and at the bottom end of the sludge hopper, so that the inner pipe diameter of the sludge hopper is alternately changed; the middle pipe section and the bottom pipe section of the sludge hopper are alternately shrunk to form peristaltic waves, adhesion is prevented while contents are pushed, high-speed shear flow is locally formed when the pipe sections are narrowed to wash the pipe wall, and a vortex area is locally formed when the pipe sections are widened to stir sediments, so that the balance state of particle deposition is favorably broken, and the formation of a continuous scale layer is inhibited; the maintenance and part replacement period is prolonged, and the operation efficiency of the precipitator is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of coal washing wastewater treatment and purification, and more particularly to a coal washing wastewater treatment and purification device and process for a coal washing plant. Background Art

[0002] Coal washing wastewater is generated during the wet coal washing process and is one of the main sources of pollution in the coal industry, causing serious pollution to the water environment near mining areas. In addition, coal-containing wastewater is also generated during coal transportation and equipment cleaning. If this wastewater is discharged directly without treatment, it will cause serious pollution to the environment. Coal washing wastewater treatment equipment is a device specifically designed to treat wastewater generated during the coal washing process. Coal washing wastewater treatment in a coal washing plant is a complex process involving multiple links and equipment. The main purpose is to remove suspended matter, coal slime, heavy metals and other harmful substances in the wastewater to ensure that it meets environmental emission standards or can be reused.

[0003] Deficiencies of existing technology: In wastewater treated by flocculation and sedimentation, due to the small size and high viscosity of coal powder particles, the alum flocs formed under the action of the reagents tend to accumulate in the sludge hopper area during the sedimentation process in the inclined tube settler, causing blockage and scaling of the settler, reducing the operating efficiency of the settler, and increasing maintenance costs and the frequency of component replacement. Summary of the Invention

[0004] In order to overcome the above-mentioned defects of the prior art, the present invention provides a coal washing wastewater treatment and purification device and process for a coal washing plant to solve the problems existing in the above-mentioned background technology.

[0005] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: a coal washing wastewater treatment and purification device for a coal washing plant, comprising an integrated housing, wherein a regulating tank, a coagulation reaction tank, and an inclined tube settler are sequentially installed inside the integrated housing, wherein a feed port is installed on one side of the regulating tank to provide a channel for external coal washing wastewater to enter the regulating tank, a paddle drying mechanism is fixedly installed on the bottom end of the inclined tube settler, a filtering and separating mechanism is fixedly connected to the top of the side of the inclined tube settler via a liquid inlet pipe, the bottom end of the filtering and separating mechanism is fixedly connected to a disinfection mechanism via a conduit, the bottom end of the disinfection mechanism is fixedly connected to a liquid outlet, and one end of the liquid outlet is disposed on the outside of the integrated housing;

[0006] The inclined tube settler includes an inclined tube sedimentation tank, a sludge hopper fixedly connected to the bottom end of the inclined tube sedimentation tank, and a first reducing assembly and a second reducing assembly respectively installed at the middle and bottom of the outer periphery of the sludge hopper. The first reducing assembly and the second reducing assembly have the same composition structure, both consisting of a supporting structure arranged around the outer periphery of the sludge hopper and a transmission structure fixedly connected to the supporting structure, wherein the transmission structure of the first reducing assembly is driven by motor 1, and the transmission structure of the second reducing assembly is driven by motor 2. Motor 1 and motor 2 are equipped with controllers to control motor 1 and motor 2 to drive the first reducing assembly and the second reducing assembly in opposite directions alternately, so that the middle and bottom pipe sections of the sludge hopper are alternately contracted.

[0007] Furthermore, the sludge hopper includes pipe wall 1, pipe wall 2, pipe wall 3 and pipe wall 4 which are sealed and welded in sequence from top to bottom, wherein the sides of pipe wall 2 and pipe wall 4 are respectively provided with through square groove 1 and square groove 2, which are arranged in an annular shape.

[0008] Furthermore, a support rod is provided in a ring shape on the outer side of the sludge hopper, and the top end of the support rod is fixedly connected to a ring plate through a fixing sleeve. A through circular groove is provided at the bottom end of the ring plate, and the circular grooves are distributed in a ring shape. A slider is provided on one side of each circular groove, and the top end of the slider is fixedly connected to the bottom end of the ring plate.

[0009] Furthermore, the top end of the annular plate is fixedly connected to motor 1, the bottom end of motor 1 is fixedly connected to a driving gear, the edge of the driving gear is meshed with a rack, one end of the rack passes through square groove 1 and is fixedly connected to a mudguard bend plate 1, the connection is sealed, a slide groove is provided at the top end of the rack, and the inside of the slide groove is movably connected to the outer side surface of the slider.

[0010] Furthermore, the edge of the driving gear is engaged with a gear ring, the inner edge of the gear ring is movably connected to a ring-shaped mounting plate, the inner edge of the ring-shaped mounting plate is fixedly connected to the outer wall of the second pipe wall, and the outer edge of the gear ring is engaged with three groups of driven gears evenly arranged in an annular shape, the internal movably connected to the driven gear is a fixing rod, the fixing rod passes through the circular groove and is fixedly connected to the annular plate, the mud guard bend plate 1 is distributed in an annular shape on the inner edge of the second pipe wall, and a built-in ring plate 1 is provided above it for protecting the mud guard bend plate 1.

[0011] Furthermore, the second diameter-changing assembly includes a second mudguard bend plate, which is distributed in an annular manner on the inner edge of the pipe wall 4, and a second built-in ring plate is provided above the mudguard bend plate for protecting the second mudguard bend plate.

[0012] Furthermore, the blade drying mechanism includes a cylinder, a transmission assembly installed at one end of the cylinder and a waste heat recovery mechanism fixedly connected to the bottom end of the cylinder. Support frames are fixedly connected to both sides of the cylinder. A fan is installed at one end of the waste heat recovery mechanism close to the transmission assembly. The interior of the waste heat recovery mechanism is provided with guide plates that are equidistantly distributed up and down.

[0013] Furthermore, an agitator is installed at the bottom end of the regulating tank, and the wastewater in the regulating tank is transported to the coagulation reaction tank through sewage pump 1. A mixer and sewage pump 2 are installed at the bottom end of the coagulation reaction tank. Sewage pump 2 is used to transport the wastewater to the inclined tube settler. A gas purification mechanism is installed at the top of the conveying blade drying mechanism, which is used to treat water vapor generated by sludge evaporation, and the treated gas is discharged through the exhaust port. A liquid inlet pipe is fixedly connected to one side of the inclined tube settler, and the clarified water in the inclined tube settler is transported to the filtration and separation mechanism through the liquid inlet pipe. The treated water in the filtration and separation mechanism is transported to the disinfection mechanism through a conduit fixedly connected to its bottom end for disinfection treatment, and the treated water is discharged through the liquid outlet.

[0014] The present invention also provides a coal washing wastewater treatment process for a coal washing plant, characterized in that it is adapted to the coal washing wastewater treatment and purification equipment for a coal washing plant as claimed in claim 1, and comprises the following process steps:

[0015] Step 1: Coal washing wastewater is fed into the regulating tank through the feed port, and the wastewater is stirred by an agitator to prevent coal slime sedimentation and siltation, and to balance the water quality and quantity;

[0016] Step 2: The wastewater with balanced water quality is input into the coagulation reaction tank through sewage pump 1. Coagulant is added to the coagulation reaction tank. The mixer is first stirred vigorously to allow the coagulant to quickly disperse and neutralize the surface charge of the coal slime colloidal particles to form tiny flocs. Then the mixer is gently stirred to promote the collision and combination of tiny flocs into larger and denser flocs.

[0017] Step 3: The wastewater after coagulation and flocculation enters the inclined tube settler through sewage pump 2. The alum flocs with larger specific gravity slide down the surface of the inclined tube to the sludge hopper at the bottom under the action of gravity and accumulate there. The clean water flows upward and enters the filtration separation mechanism through the upper liquid inlet pipe.

[0018] Step 4: The deposited sludge enters the blade drying mechanism through the sludge hopper, is discharged after being dried in the blade drying mechanism, and then is squeezed by the press to form a mud cake, which is discharged from the equipment through the discharge port;

[0019] Step 5: The clarified water after sedimentation treatment enters the filtration and separation mechanism, where it is filtered and treated by biofilm method to further remove water impurities, decompose and transform organic matter in the wastewater, and achieve wastewater purification;

[0020] Step 6: The disinfection unit disinfects the water treated by the filtration and separation unit to ensure that the final effluent water quality meets the national or local emission standards.

[0021] Technical effects and advantages of the present invention:

[0022] 1. The present invention provides a first reducing assembly and a second reducing assembly in the middle and bottom of the sludge hopper to alternately change the internal diameter of the sludge hopper, causing the middle and bottom pipe sections of the sludge hopper to alternately contract to form a "peristaltic wave"-like structure. This not only pushes the contents but also prevents adhesion. When the pipe section narrows, a high-speed shear flow is formed locally to scour the pipe wall. When the pipe section widens, a vortex zone is formed locally to stir the sediment. This helps to break the equilibrium state of particle deposition, inhibit the formation of continuous scale layers, extend the maintenance and component replacement cycle, and improve the operating efficiency of the precipitator. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic cross-sectional view of the overall structure of the present invention;

[0024] Figure 2 It is a structural schematic diagram of the sludge hopper of the present invention;

[0025] Figure 3 This is a schematic structural diagram of the sludge hopper tube wall of the present invention;

[0026] Figure 4 It is a partial schematic diagram of the first reducing assembly of the present invention;

[0027] Figure 5 It is a partial schematic diagram of the first reducing assembly of the present invention;

[0028] Figure 6 A top view of the sludge hopper tube wall with two diameters contracted according to the present invention;

[0029] Figure 7 A top view of the sludge hopper tube wall with four diameters contracted according to the present invention;

[0030] Figure 8 It is a side view of the blade drying mechanism of the present invention;

[0031] Figure 9 It is a structural schematic diagram of the waste heat recovery mechanism of the present invention.

[0032] The accompanying drawings are marked as follows: 1. integrated housing; 2. regulating tank; 21. feed port; 22. sewage pump 1; 23. agitator; 3. coagulation reaction tank; 31. mixer; 32. sewage pump 2; 4. inclined tube settler; 41. sludge hopper; 411. pipe wall 1; 412. pipe wall 2; 413. pipe wall 3; 414. pipe wall 4; 415. square groove 1; 416. square groove 2; 42. first reducing assembly; 421. support rod; 4211. fixing sleeve; 4212. annular plate; 4213. circular groove; 4214. slider; 422. motor 1; 4221. driving gear; 4222. rack; 4223. gear Mud bender plate 1; 4224, gear ring; 4225, annular mounting plate; 4226, driven gear; 4227, fixing rod; 4228, slide; 4229, controller; 43, second reducing assembly; 431, mud bender plate 2; 44, built-in ring plate 1; 45, built-in ring plate 2; 5, blade drying mechanism; 51, cylinder; 511, support frame; 52, transmission assembly; 53, waste heat recovery mechanism; 531, fan; 532, guide plate; 54, gas purification mechanism; 55, exhaust port; 6, filtration and separation mechanism; 61, liquid inlet pipe; 62, conduit; 7, disinfection mechanism; 71, liquid outlet; 8, discharge port. DETAILED DESCRIPTION

[0033] The technical solutions of the present invention will be described clearly and completely below in conjunction with the drawings in the present invention. In addition, the forms of the various structures described in the following embodiments are merely examples. The coal washing wastewater treatment and purification equipment and process for a coal washing plant involved in the present invention are not limited to the various structures described in the following embodiments. All other embodiments obtained without creative work by ordinary technicians in this field fall within the scope of protection of the present invention.

[0034] Reference Figures 1 to 5 The present invention provides a coal washing wastewater treatment and purification device for a coal washing plant, comprising an integrated housing 1, wherein a regulating tank 2, a coagulation reaction tank 3, and an inclined tube precipitator 4 are sequentially installed inside the integrated housing 1, wherein a feed port 21 is installed on one side of the regulating tank 2 for providing a channel for external coal washing wastewater to enter the regulating tank 2, a paddle drying mechanism 5 is fixedly installed at the bottom end of the inclined tube precipitator 4, a filtering and separating mechanism 6 is fixedly connected to the top of the side of the inclined tube precipitator 4 through a liquid inlet pipe 61, the bottom end of the filtering and separating mechanism 6 is fixedly connected to a disinfection mechanism 7 through a guide tube 62, the bottom end of the disinfection mechanism 7 is fixedly connected to a liquid outlet 71, and one end of the liquid outlet 71 is arranged on the outside of the integrated housing 1;

[0035] The inclined tube settler 4 includes an inclined tube sedimentation tank, a sludge hopper 41 fixedly connected to the bottom end of the inclined tube sedimentation tank, and a first reducing assembly 42 and a second reducing assembly 43 respectively installed in the middle and bottom of the outer periphery of the sludge hopper 41. The first reducing assembly 42 and the second reducing assembly 43 have the same composition structure, both consisting of a supporting structure arranged around the outer periphery of the sludge hopper 41 and a transmission structure fixedly connected to the supporting structure, wherein the transmission structure of the first reducing assembly 42 is driven by motor 1 422, and the transmission structure of the second reducing assembly 43 is driven by motor 2. Motor 1 422 and motor 2 are equipped with a controller 4229, which controls motor 1 422 and motor 2 to drive the first reducing assembly 42 and the second reducing assembly 43 in reverse and alternating directions, so that the middle and bottom pipe sections of the sludge hopper 41 are alternately contracted.

[0036] A preferred embodiment of the present invention is as follows: the wastewater after coagulation and flocculation enters the inclined tube settler 4 through the sewage pump 2 32, and the inclined tube settler 4 is densely arranged with honeycomb inclined tube components with an inclination angle of 60°. The alum flocs with a larger specific gravity slide down along the surface of the inclined tube to the sludge hopper 41 at the bottom under the action of gravity and accumulate therein, while the clean water flows upward and is discharged through the upper liquid inlet pipe 61.

[0037] Alum flowers formed by the action of the agent accumulate in the sludge hopper 41 during the sedimentation process, and are very prone to clogging and scaling. The first reducing assembly 42 and the second reducing assembly 43 installed in the middle and bottom of the sludge hopper 41 alternately change the internal pipe diameter of the sludge hopper 41, so that the middle and bottom pipe sections of the sludge hopper 41 alternately contract to form a "peristaltic wave", which can prevent adhesion while pushing the contents. When the pipe section becomes narrower, a high-speed shear flow is formed locally to flush the pipe wall. When the pipe section becomes wide, a vortex area is formed locally to stir the sediment, breaking the equilibrium state of particle deposition and inhibiting the formation of a continuous scale layer. The diameter change of the fixed pipe section is periodic, and different frequencies match sludge of different viscosities.

[0038] Reference Figures 3 to 5 The sludge hopper 41 includes a pipe wall 1 411, a pipe wall 2 412, a pipe wall 3 413 and a pipe wall 4 414 which are sealed and welded in sequence from top to bottom, wherein the sides of the pipe wall 2 412 and the pipe wall 4 414 are respectively provided with a through square groove 1 415 and a square groove 2 416 which are arranged in a ring shape.

[0039] Among them, a support rod 421 is arranged in a ring shape on the outer side of the sludge hopper 41, and the top of the support rod 421 is fixedly connected to the annular plate 4212 through a fixing sleeve 4211. A through circular groove 4213 is opened at the bottom end of the annular plate 4212, and the circular grooves 4213 are distributed in a ring shape. A slider 4214 is arranged on one side of each circular groove 4213, and the top of the slider 4214 is fixedly connected to the bottom end of the annular plate 4212.

[0040] Among them, the top end of the annular plate 4212 is fixedly connected to the motor 1 422, the bottom end of the motor 1 422 is fixedly connected to the driving gear 4221, the edge of the driving gear 4221 is meshed with a rack 4222, one end of the rack 4222 passes through the square groove 1 415 and is fixedly connected to the mudguard bend 1 4223, the connection is sealed, and a slide groove 4228 is provided at the top end of the rack 4222, and the interior of the slide groove 4228 is movably connected to the outer side surface of the slider 4214.

[0041] Among them, the edge of the driving gear 4221 is engaged with a gear ring 4224, the inner edge of the gear ring 4224 is movably connected to a ring-shaped mounting plate 4225, the inner edge of the ring-shaped mounting plate 4225 is fixedly connected to the outer wall of the second tube wall 412, and the outer edge of the gear ring 4224 is engaged with three groups of annular evenly arranged driven gears 4226, the interior of the driven gear 4226 is movably connected to a fixing rod 4227, and the fixing rod 4227 passes through the circular groove 4213 and is fixedly connected to the annular plate 4212.

[0042] In a preferred embodiment of the present invention, the controller 4229 controls the motor 1 422 to drive the driving gear 4221 to perform periodic forward and reverse rotation, so that the gear ring 4224 engaged therewith performs periodic forward and reverse rotation, and then realizes the centripetal movement of the rack by driving the driven gear 4226 to rotate forward and reverse. While the driving gear 4221 rotates forward and reverse, it drives the rack 4222 to perform regular centripetal movement. The centripetal movement of the annularly distributed rack 4222 causes the mudguard bend plate 1 4223 at its end to contract centripetally, thereby achieving the purpose of periodically contracting the pipe diameter.

[0043] like Figure 6 The figure shows the state where the first reducing assembly 42 contracts centripetally to reduce the pipe diameter, while the second reducing assembly 43 expands outward to widen the pipe diameter. The mudguard bend plate 1 4223 is distributed annularly on the inner edge of the second pipe wall 412, and an internal ring plate 1 44 is provided above it to protect the mudguard bend plate 1 4223.

[0044] like Figure 7 The figure shows a state in which the first reducing assembly 42 expands outward to widen the pipe diameter, while the second reducing assembly 43 contracts centripetally to reduce the pipe diameter. The second reducing assembly 43 includes a second mudguard bend 431, which is distributed annularly on the inner edge of the fourth pipe wall 414. A second built-in ring plate 45 is provided above the second mudguard bend 431 to protect the second mudguard bend 431.

[0045] The first diameter-reducing component 42 and the second diameter-reducing component 43 contract alternately, breaking the equilibrium state of particle deposition, inhibiting the formation of a continuous scale layer, and allowing the sludge to pass through the sludge hopper 41 more smoothly.

[0046] Reference Figure 8 and Figure 9The paddle drying mechanism 5 includes a cylinder 51, a transmission assembly 52 installed at one end of the cylinder 51, and a waste heat recovery mechanism 53 fixedly connected to the bottom end of the cylinder 51. Support frames 511 are fixedly connected to both sides of the cylinder 51. A fan 531 is installed at one end of the waste heat recovery mechanism 53 close to the transmission assembly 52. ​​The interior of the waste heat recovery mechanism 53 is provided with guide plates 532 that are equidistantly distributed up and down.

[0047] In a preferred embodiment of the present invention, the sludge enters the paddle drying mechanism 5 through the sludge hopper 41, and the transmission assembly 52 drives the hollow paddle to rotate. A double-axis paddle is installed in the cylinder 51, and the paddles are arranged alternately. The sludge is stirred and pushed during rotation. A heat medium is passed through the hollow paddle, and the heat is transferred to the sludge in contact with it. The sludge is heated and the internal moisture is evaporated. At the same time, a waste heat recovery mechanism 53 is provided at the bottom of the cylinder 51. The fan 531 installed at the end of the waste heat recovery mechanism 53 recovers the waste heat inside the integrated shell 1. The guide plate 532 makes the recovered hot air evenly distributed inside the waste heat recovery mechanism 53, and transfers heat through the bottom plate of the cylinder 51. The paddle drying mechanism 5 is used to recover the internal heat of the equipment, make up for the insufficient temperature of the heat transfer end of the paddle shaft, and supplement it with heat.

[0048] Reference Figure 1 A stirrer 23 is installed at the bottom of the regulating tank 2. The wastewater in the regulating tank 2 is transported to the coagulation reaction tank 3 through a sewage pump 1 22. A mixer 31 and a sewage pump 2 32 are installed at the bottom of the coagulation reaction tank 3. The sewage pump 2 32 is used to transport the wastewater to the inclined tube settler 4. A gas purification mechanism 54 is installed at the top of the conveying blade drying mechanism 5 for treating the water vapor generated by sludge evaporation. The treated gas is discharged through the exhaust port 55. A liquid inlet pipe 61 is fixedly connected to one side of the inclined tube settler 4. The clarified water in the inclined tube settler 4 is transported to the filtration and separation mechanism 6 through the liquid inlet pipe 61. The treated water in the filtration and separation mechanism 6 is transported to the disinfection mechanism 7 for disinfection through a conduit 62 fixedly connected to its bottom end. The treated water is discharged through the liquid outlet 71.

[0049] Coal washing wastewater is input into the regulating tank 2 through the feed port 21. The regulating tank 2 is used to homogenize and equalize the coal washing wastewater from different processes or different time periods to ensure the relative stability of the water inlet of the subsequent treatment unit. The agitator 23 installed at the bottom is used for stirring to prevent the sedimentation and accumulation of coal slime. The treated wastewater is pumped into the coagulation reaction tank 3 through the sewage pump 22. At this time, the coagulant is added. The mixer 31 equipped in the coagulation reaction tank 3 first stirs violently to disperse the coagulant quickly and neutralize the negatively charged colloidal particles in the water, reducing the repulsive force between the particles to form tiny flocs. Then, gentle stirring is carried out to promote the tiny flocs to colloidal and combine into larger and denser flocs under the bridging and net-catching sweeping action of the flocculant, thereby increasing the effective particle size and specific gravity of the suspended particles and creating conditions for subsequent sedimentation.

[0050] The wastewater after coagulation and flocculation enters the inclined tube settler 4 through the sewage pump 2 32, the flocs are precipitated, and enter the blade drying mechanism 5 through the sludge hopper 41 for drying. The dry sludge is discharged from the bottom of the end of the cylinder 51, and is squeezed by the press to form a mud cake which is discharged from the discharge port 8.

[0051] The water vapor generated by evaporation of the sludge is treated by the gas purification mechanism 54 and then discharged from the equipment through the exhaust port 55. In addition, the clean water separated by precipitation in the inclined tube settler 4 is fed into the filtration and separation mechanism 6 through the liquid inlet pipe 61. After being treated by the filtration and separation mechanism 6, it is fed into the disinfection mechanism 7 through the conduit 62. After being treated by the disinfection mechanism 7 and meeting the discharge standards, it is discharged from the equipment through the liquid outlet 71.

[0052] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A coal washing wastewater treatment and purification device for a coal washing plant, comprising an integrated housing (1), characterized in that: The interior of the integrated housing (1) is sequentially provided with a regulating tank (2), a coagulation reaction tank (3) and an inclined tube sedimentation vessel (4), wherein a feed port (21) is provided on one side of the regulating tank (2) for providing a passage for external coal washing wastewater to enter the regulating tank (2), a paddle drying mechanism (5) is fixedly provided at the bottom end of the inclined tube sedimentation vessel (4), a filtering and separating mechanism (6) is fixedly connected to the top of the side of the inclined tube sedimentation vessel (4) via a liquid inlet pipe (61), a disinfection mechanism (7) is fixedly connected to the bottom end of the filtering and separating mechanism (6) via a conduit (62), a liquid outlet (71) is fixedly provided at the bottom end of the disinfection mechanism (7), and one end of the liquid outlet (71) is provided outside the integrated housing (1); The inclined tube settler (4) comprises an inclined tube settling tank, a sludge hopper (41) fixedly connected to the bottom end of the inclined tube settling tank, and a first diameter reducing assembly (42) and a second diameter reducing assembly (43) respectively installed at the middle and bottom of the outer periphery of the sludge hopper (41). The first diameter reducing assembly (42) and the second diameter reducing assembly (43) have the same structure, both consisting of a support structure arranged around the outer periphery of the sludge hopper (41) and a transmission structure fixedly connected to the support structure. The transmission structure of the first diameter reducing assembly (42) is driven by a first motor (422), and the transmission structure of the second diameter reducing assembly (43) is driven by a second motor. The first motor (422) and the second motor are equipped with a controller (4229) to control the first motor (422) and the second motor to drive the first diameter reducing assembly (42) and the second diameter reducing assembly (43) in opposite directions and alternately, so that the middle and bottom pipe sections of the sludge hopper (41) are alternately contracted.

2. The coal washing wastewater treatment and purification equipment for a coal washing plant according to claim 1, characterized in that: The sludge hopper (41) comprises a pipe wall 1 (411), a pipe wall 2 (412), a pipe wall 3 (413) and a pipe wall 4 (414) which are sealed and welded in sequence from top to bottom, wherein the side surfaces of the pipe wall 2 (412) and the pipe wall 4 (414) are respectively provided with a through square groove 1 (415) and a through square groove 2 (416), which are arranged in an annular shape.

3. The coal washing wastewater treatment and purification equipment for a coal washing plant according to claim 2, characterized in that: A support rod (421) is provided in an annular shape on the outer side of the sludge hopper (41). The top end of the support rod (421) is fixedly connected to an annular plate (4212) via a fixing sleeve (4211). A through circular groove (4213) is provided at the bottom end of the annular plate (4212). The circular grooves (4213) are distributed in an annular shape. A slider (4214) is provided on one side of each circular groove (4213). The top end of the slider (4214) is fixedly connected to the bottom end of the annular plate (4212).

4. The coal washing wastewater treatment and purification equipment for a coal washing plant according to claim 3, characterized in that: The top end of the annular plate (4212) is fixedly connected to a motor (422), the bottom end of the motor (422) is fixedly connected to a driving gear (4221), the edge of the driving gear (4221) is meshed with a rack (4222), one end of the rack (4222) passes through a square groove (415) and is fixedly connected to a mudguard (4223), the connection is sealed, a slide groove (4228) is provided at the top end of the rack (4222), and the interior of the slide groove (4228) is movably connected to the outer side surface of the slider (4214).

5. The coal washing wastewater treatment and purification equipment for a coal washing plant according to claim 4, characterized in that: The edge of the driving gear (4221) is meshed with a gear ring (4224), the inner edge of the gear ring (4224) is movably connected to an annular mounting plate (4225), the inner edge of the annular mounting plate (4225) is fixedly connected to the outer wall of the second pipe wall (412), and the outer edge of the gear ring (4224) is meshed with three groups of annular evenly arranged driven gears (4226), the inner portion of the driven gear (4226) is movably connected to a fixing rod (4227), the fixing rod (4227) passes through the circular groove (4213) and is fixedly connected to the annular plate (4212), the mudguard bend plate (4223) is annularly distributed on the inner edge of the second pipe wall (412), and a built-in annular plate (44) is provided above the mudguard bend plate (4223) for protecting the mudguard bend plate (4223).

6. The coal washing wastewater treatment and purification equipment for a coal washing plant according to claim 1, characterized in that: The second diameter reducing assembly (43) includes a second mudguard bend plate (431), which is distributed in an annular manner on the inner edge of the fourth pipe wall (414), and a second built-in ring plate (45) is provided above the second mudguard bend plate (431) for protecting the second mudguard bend plate (431).

7. The coal washing wastewater treatment and purification equipment for a coal washing plant according to claim 1, characterized in that: The blade drying mechanism (5) comprises a cylinder (51), a transmission assembly (52) installed at one end of the cylinder (51), and a waste heat recovery mechanism (53) fixedly connected to the bottom end of the cylinder (51); support frames (511) are fixedly connected to both sides of the cylinder (51); a fan (531) is installed at one end of the waste heat recovery mechanism (53) close to the transmission assembly (52); and guide plates (532) are arranged inside the waste heat recovery mechanism (53) at equal intervals and staggered in an upper and lower direction.

8. The coal washing wastewater treatment and purification equipment for a coal washing plant according to claim 1, characterized in that: The bottom end of the regulating tank (2) is equipped with an agitator (23). The wastewater in the regulating tank (2) is transported to the coagulation reaction tank (3) through the sewage pump 1 (22). The bottom end of the coagulation reaction tank (3) is equipped with a mixer (31) and a sewage pump 2 (32). The sewage pump 2 (32) is used to transport the wastewater to the inclined tube settler (4). The top end of the conveying blade drying mechanism (5) is equipped with a gas purification mechanism (54) for treating water vapor generated by evaporation of sludge. The treated gas is discharged through the exhaust port (55). One side of the inclined tube settler (4) is fixedly connected with a liquid inlet pipe (61). The clarified water in the inclined tube settler (4) is transported to the filtration and separation mechanism (6) through the liquid inlet pipe (61). The treated water in the filtration and separation mechanism (6) is transported to the disinfection mechanism (7) through a conduit (62) fixedly connected to the bottom end thereof for disinfection treatment. The treated water is discharged through the liquid outlet (71).

9. A coal washing wastewater treatment process for a coal washing plant, characterized in that: The coal washing wastewater treatment and purification equipment for a coal washing plant according to claim 1 comprises the following process steps: Step 1: Coal washing wastewater is fed into the regulating tank (2) through the feed port (21), and the wastewater is stirred by the stirrer (23) to prevent coal slime sedimentation and siltation, thereby balancing the water quality and quantity; Step 2: The wastewater with balanced water quality is input into the coagulation reaction tank (3) through the sewage pump (22). A coagulant is added into the coagulation reaction tank (3). The mixer (31) is first stirred vigorously to allow the coagulant to quickly disperse and neutralize the surface charge of the coal slime colloidal particles to form tiny flocs. Then, the mixer (31) is stirred gently to promote the collision and combination of the tiny flocs into larger and denser flocs. Step 3: The wastewater after coagulation and flocculation enters the inclined tube sedimentation tank (4) through the sewage pump 2 (32). The alum flowers with a larger specific gravity slide down the surface of the inclined tube to the sludge hopper (41) at the bottom under the action of gravity and accumulate therein. The clean water flows upward and enters the filtration separation mechanism (6) through the upper liquid inlet pipe (61); Step 4: The deposited sludge enters the blade drying mechanism (5) through the sludge hopper (41), is discharged after being dried in the blade drying mechanism (5), and is then squeezed by a press to form a mud cake, which is discharged from the equipment through the discharge port (8); Step 5: The clarified water after the sedimentation treatment enters the filtration and separation mechanism (6), and is filtered and treated by a biofilm method in the filtration and separation mechanism (6) to further remove water impurities, decompose and transform organic matter in the wastewater, and achieve wastewater purification; Step 6: The disinfection mechanism (7) disinfects the water treated by the filtration and separation mechanism (6) so that the final effluent water quality meets the national or local discharge standards.

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